Start stop sequence of Roots vacuum pump

Start stop sequence of Roots vacuum pump

Roots vacuum pumps are usually used with the front pump. In use, especially in the process of start and stop, it should be noted that the process is different from simple single pump, and the sequence is strict. Interruption may cause damage to the device unit. Therefore, let's see what the roots vacuum pump starts in the process of use.

Let's start with the startup program. In addition to multistage, wet and air-cooled Roots vacuum pumps, conventional roots vacuum pumps need to be combined with the front pump to avoid equipment damage due to excessive pressure difference. So before starting the roots vacuum pump:

(1) Start the front pump; 2) open the valve on the pipeline of the front pump and the intake and exhaust valve of Roots vacuum pump;

When the system pressure reaches the allowable inlet pressure of Roots vacuum pump (the allowable inlet pressure of Roots vacuum pump from different manufacturers is different), close the valve on the pre pumping pipeline and restart the roots vacuum pump. In the absence of the above-mentioned pre pumping pipeline, the front pump can start the roots vacuum pump after pumping the allowable inlet pressure of the roots vacuum pump.

Roots vacuum pump must be used in strict accordance with the technical specifications. Generally speaking, the inlet pressure of Roots vacuum pump is below 1330 PA, and the pumping efficiency is good (the maximum pumping efficiency should be in the range of 100-1 PA). In application, the maximum inlet pressure shall not exceed the maximum allowable inlet pressure, nor shall it be suitable for operation under high inlet pressure for too long. In addition, under normal operation, the maximum temperature of the general pump shall not exceed 40 ℃, and the maximum temperature shall not exceed 80 ℃, which depends on the specific characteristics of the manufacturer's products. There shall be no irregular abnormal vibration and noise during operation. In case of motor overload, high temperature rise, abnormal noise and large vibration during operation, stop the machine immediately to check the cause and remove the fault.

Best Water Ring Vacuum Pumpp

Dry Type Vacuum Pump

Oil Diffusion Vacuum Pump

Correct use of 2SK water ring vacuum pump

Correct use of 2SK water ring vacuum pump

Before 2SK water ring vacuum pump, it is necessary to check whether the rotation direction of the motor is consistent with that of the pump. After starting the vacuum pump, adjust the size of the water inlet, and then check whether the packing pressure is appropriate (normal packing pressure will make the water drop in the pump leak out). Sk-1.5b should first add water, then start the vacuum pump, and then adjust the size of the water inlet. The bearing lubrication is normal.

 

After 2SK water ring vacuum pump is started, it is necessary to observe whether there is vibration, listen carefully to whether there is noise in SK cantilever water ring vacuum pump, and measure the temperature of stuffing box and bearing (the normal bearing temperature shall not be 35 ℃ higher than the ambient temperature, and the working temperature shall not be higher than 70 ℃). If the temperature is too high, park the vehicle immediately to check the cause.

When SK cantilever water ring vacuum pump is used as the vacuum water diversion of the pump, during the operation of the pump, all air in the pump is sucked out until the water is sucked out to sk cantilever water ring vacuum pump in the future, that is, start the pump, stop the vacuum pump after the pump works normally, and seal the suction valve.

Water Ring Vacuum Pump Pipeline Arrangement

Water Ring Vacuum Pump

Water Ring Vacuum Pump manufacturers

water ring vacuum pump routine maintenance

water ring vacuum pump routine maintenance

The service life of the water ring vacuum pump is not only related to the quality of the pump itself, but also to its daily management. Therefore, it is necessary to manage and maintain the water ring pump regularly. So, what is the daily management of water ring vacuum pump?

1. Regular cleaning and oil change: kerosene or straight run gasoline shall be used to clean the water ring vacuum pump. After cleaning, all parts shall be dried, dried in the air or blown by a blower. When changing oil, 100 × or 1 × clean vacuum pump oil shall be selected. If other oil is used instead, the vacuum degree of the pump will be seriously affected.

2. Before starting the pump, check whether the rotation direction of the motor is correct, whether the lubrication system is reliable and whether the oil volume is appropriate.

3. During daily operation, ensure that the oil temperature is not more than 75 ℃, and there is not too much noise and vibration, otherwise, shut down for maintenance.

4. The connecting pipeline between the pump and the user system shall be mainly short and thick, and elbows shall be minimized. If there are elbows, all joints shall be strictly sealed to ensure no air leakage.

5. When stopping the pump, first close the valve connecting the vacuum system and open the vent valve to prevent the pump oil from being sucked back into the vacuum system, and then cut off the power supply of the motor.

The long-term and efficient use of water ring vacuum pump is inseparable from our careful management and maintenance. When we use water ring vacuum pump everyday, we should do the above points well, so that the pump can be efficiently used in industrial production.

Water Ring Vacuum Pump Shaft Seal Leakage Detection Method

Vacuum System Basic Concept

How To Install The Components Of Water Ring Vacuum Pump

Influence of water temperature on water ring vacuum pump

Influence of water temperature on water ring vacuum pump

Water ring vacuum pump is a type of vacuum pump that we can often use. We all know that its service performance is very good, but it does not rule out accidents. After a period of use, it is easy to have some unexpected problems. There are many factors that affect the normal operation of the vacuum pump, so the water temperature is one of them, whether the water temperature is too high or too low, it will have a certain impact on the operation of the vacuum pump. So, why on earth is this? Now let's have a detailed understanding of the reasons.

1. Too high water temperature will make the water evaporate, and the negative pressure condition will further aggravate the occurrence of this kind of vaporization and evaporation, making the pump body produce too much water vapor. In this way, when the water ring vacuum pump inhales too much water vapor, but seldom inhales outside, resulting in a very low vacuum degree of the system. There are two main reasons for the high water temperature, one is that the water supply temperature is too high, the other is that the water temperature rises in the working process.

2. Because the water temperature is related to the suction capacity, the working fluid temperature is high, and the air volume will decrease. With the increase of temperature, the evaporation capacity increases, occupying the original displacement, and the suction capacity decreases, which will prolong the vacuumizing time. In addition, under the vacuum condition, the evaporation capacity of the sealing liquid will increase with the increase of temperature, and the larger the percentage of the displacement, the situation that cannot be vacuumized will occur. As for the data involved too much, the evaporation capacity of sealing liquid under various vacuum degrees and the evaporation capacity under various temperatures are not the same, so it is impossible to give specific data. Only under certain vacuum degrees can the temperature change be reflected and the evaporation capacity change be caused. In use, it must be combined with temperature, and the superposition of two performance curves of vacuum degree and pump performance curve can be seen.

Roots vacuum pump

Liquid Ring Vacuum compressor

Rotary Piston Vacuum Pump

water ring vacuum pump structure description

water ring vacuum pump structure description

The use of water ring vacuum pump is quite common, especially before use, we need to have a general understanding of its mechanism, because only when we understand the structure of the equipment, can we operate more easily in the future. So, in order to let you know more about the device, let's introduce the structure of the device:

Structure description: water ring vacuum pump is composed of pump body, front and rear end cover, impeller, shaft and other parts. And parts and components are complementary, one less vacuum pump will be paralyzed, so let's take a look at the detailed structure of the vacuum pump.

The intake pipe and exhaust pipe are connected with the pump cavity through the suction hole and exhaust hole installed on the disc on the end cover. The impeller of the water ring vacuum pump is fixed on the shaft with a key and installed eccentrically in the pump body. The total clearance at both ends of the pump is adjusted by the gasket between the pump body and the disc. The clearance between the impeller and the front and rear discs is adjusted by the impeller driven by the shaft sleeve. The clearance at both ends is guaranteed to be uniform. The shaft and impeller are interference fit, and the clearance is determined by the front end positioning. The gap between the two end faces of impeller and the front and rear discs determines the loss of gas and its pressure in the flow from the air inlet to the exhaust port.

The packing of the water ring vacuum pump is installed in the two end covers. The sealing water enters the packing through the small hole in the end cover to cool the packing and enhance the sealing effect. The make-up water required for impeller to form water ring is supplied by water supply pipe, which can also be connected with steam water separator for circulating water supply. If the mechanical seal is adopted, the mechanical seal is installed in the packing cavity without packing. The packing gland is replaced by the mechanical seal gland, and the other structures are the same.

The bearing of water ring vacuum pump is fixed on the shaft by a round nut. A disc is arranged on the end cover, and the disc is provided with suction and exhaust holes and rubber ball valves. The function of rubber ball valve is that when the gas pressure between impeller blades reaches the exhaust pressure, the gas will be discharged before the exhaust port, feeding the power consumed due to the excessive gas pressure and reducing the power consumption.

Water Ring Vacuum Pump In Steel Plant Vacuum Degassing Equipment

Water Ring Vacuum Pump Type

Water Ring Vacuum Pump manufacturers

Leakage rate detection of water ring vacuum pump

Leakage rate detection of water ring vacuum pump

With the development of society, vacuum pump has been widely used, especially water ring vacuum pump is a typical vacuum pump. In order to use it better, we often need to detect the leakage rate, which is mainly divided into internal leakage and external leakage detection. The internal leakage is more complex. Let's have a detailed understanding.

1. The internal leakage of water ring vacuum pump mostly occurs on the equipment with water-cooled jacket. No doubt was found through checking the external leakage, but there are the following phenomena: the pumping speed of mechanical pump is obviously low, the indicated value of vacuum gauge is low, the mechanical pump oil is quickly emulsified, and the iron-based parts in vacuum chamber are obviously rusted. If the above conditions are met, internal leakage can be basically determined. Clean the inner wall first, and then pass cooling water to see if there is any wet point. The wet point is the leakage point.

2. Small leakage and micro leakage are difficult to check. The commonly used method is to use the ionization tube sensitive to some gases in high vacuum state to detect leakage, such as acetone or ethanol. Use a medical syringe to spray acetone or ethanol to the suspicious place. When it is sprayed to the leakage point, the pointer of the ionization meter will swing obviously. In this way, we must be patient, wait until the indicator value of the ionization meter is stable, that is, the pumping capacity and leakage rate of the water ring vacuum pump are balanced, and then spray again, try to repeat several times to confirm the leakage point.

3. For larger leakage point, flame method can be used. Based on the principle that air flow can make the flame deviate, vacuum first. For example, use candle or lighter to gradually search around the suspicious point, and it will be found that the flame deviates to the leakage point, then the leakage point can be found.

Water Ring Vacuum Pump Selection Steps

Water Ring Vacuum Pump Start And Stop Operation And Precautions

Rotary Vane Vacuum Pump For Resin Defoaming

Overall performance of water ring vacuum pump products

Overall performance of water ring vacuum pump products

 Through the development and application of water ring vacuum pumps, based on the product's capabilities and advantages in various aspects, it can fully reflect its substantial strength from the overall reliability of the product. Based on the advantages of product applications and continuous promotion, it is necessary to According to the actual development capability of the product, enhance its overall expansion to rapidly raise product standards, expand its continuous improvement of performance, and promote the development of various aspects with strong product capabilities. In order to further develop the practical performance of the product, The broader market environment reflects the applicability of the product.


Therefore, we must aim at the overall development of water ring vacuum pump products, increase the ability to continuously improve the application of the product, and use the advantages of rapid development to increase the effectiveness of development in various aspects. Through the ability of active development, it fully reflects its continuous improvement. Ability, based on a strong product application foundation, actively carry out overall driving and guarantee of reliability, and further deepen the actual effect of product expansion through substantial production development, so as to use the performance capabilities to expand the overall product Practical basis.

 We must conscientiously implement various performance indicators of water ring vacuum pumps, make rational adjustments to production and processing, accelerate the advantages of active development, and improve the actual effect of product applications with a more in-depth performance capability, which is effective for overall development. It is very in place.

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment

water ring vacuum pump structural components

water ring vacuum pump structural components

Water ring vacuum pump structure description: Water ring vacuum pump is composed of pump body, front and rear end cover, impeller, shaft and other parts. And parts and components are mutually complementary, and one less water ring vacuum pump will be paralyzed, so let's take a look at the detailed structure of the water ring vacuum pump:

The intake pipe and the exhaust pipe are connected to the pump cavity through the suction hole and the exhaust hole on the disk mounted on the end cover. The impeller of the water ring vacuum pump is fixed on the shaft with a key and is eccentrically installed in the pump body. The total gap between the two ends of the pump is adjusted by the pad between the pump body and the disc. The gap between the impeller and the front and rear discs is adjusted by the impeller pushing the impeller. The gap at both ends is guaranteed to be uniform. The shaft and the impeller are interference fits, and this clearance is determined when the front end is positioned. The clearance between the two end surfaces of the impeller and the front and rear disks determines the magnitude of the gas loss in the pump cavity from the inlet to the exhaust port and its ultimate pressure.

The water ring vacuum pump packing is installed in the two ends of the cap, and the sealing water enters the packing through the small holes in the end cap, cooling the packing and strengthening the sealing effect. The supplementary water required for the impeller to form a water ring is supplied by the water supply pipe, which can also be connected to the steam-water separator to circulate water. If the mechanical seal is used as the seal type, the mechanical seal is installed in the filling cavity, and no filler is needed. The filler gland is replaced with a mechanical seal gland, and the rest of the structure is the same.

The water ring vacuum pump bearing is fixed on the shaft by a round nut. A disc is installed on the end cover, and the disc is provided with suction and exhaust holes and a rubber ball valve. The function of the rubber ball valve is that when the gas pressure between the impeller blades reaches the exhaust pressure, the gas is discharged before the exhaust port, which feeds the power consumed by the excessive gas pressure and reduces the power consumption.

How To Use Vacuum Pump

Liquid Ring Vacuum Pump

Roots Vacuum Pump

2BV water ring vacuum pump Working principle

The working principle of the 2BV water ring vacuum pump must be understood by every relevant worker, because it is related to the operator's understanding of the equipment and the proficiency of the operation, and indirectly affects the work efficiency. Therefore, the following editors summarize it for everyone Let's take a look at the working principle with the icon:

As shown in the figure, the impeller is eccentrically installed in the pump body, and a certain height of water is injected into the pump when starting. Therefore, when the impeller 3 rotates, the water is subjected to centrifugal force to form a rotating water ring 1 on the inner wall of the pump. The inner surface of the lower part of the ring is tangent to the hub and rotates in the direction of the arrow. During the first half of the rotation, the inner surface of the water ring of the 2BV water ring vacuum pump gradually disengages from the hub. Rotating, the space gradually expands, the space gas pressure decreases, and the gas is sucked in from the disk suction port; during the second half of the rotation, the inner surface of the water ring gradually approaches the hub, the space between the blades gradually shrinks, and the space gas pressure increases. When the pressure is higher than the exhaust port, the gas between the blades is discharged from the disc exhaust port. In this way, every time the impeller rotates for one week, the space between the blades sucks and exhausts once. Many spaces work continuously, and the equipment continuously sucks or pressurizes the gas.

Looking at the working principle of the 2BV water ring vacuum pump above, we found that during the operation of the pump, the working water ring heats up, and at the same time part of the water and gas are discharged together. Therefore, the pump must be continuously supplied with water to meet the working requirements of the pump. I hope that after fully understanding the internal structure principle of the equipment, it will bring some help to everyone's future work.

Vacuum Pump Type Introduction

How To Choose Vacuum Pump

Difference Between Vacuum Pump And Air Compressor

System description of vacuum pump system

System description of vacuum pump system

The limit vacuum of reciprocating vacuum pump system (also known as piston vacuum pump) is 4x102pa-103pa for single stage, 1pA for double stage and 45m3 / h-20000m3 / h for pumping from sealed container. The content of extracted gas is not more than 35t. If auxiliary equipment, such as refrigerator, is added, swallowing gas can also be extracted. The reciprocating vacuum pump system has a large exhaust volume, which is mainly used for vacuum impregnation, steel vacuum treatment, vacuum distillation, vacuum concentration, vacuum crystallization, vacuum dry bath, vacuum filtration and concrete vacuum operation.

Reciprocating vacuum pump system is not suitable for conveying corrosive gas or gas containing particle dust. If there is dust in the suction valve, a filter must be installed at the inlet of the pump. The oil-free reciprocating vacuum pump adopts the piston ring and sealing ring made of self-lubricating materials, so it is unnecessary to add lubricating oil in the cylinder; an oil separator is added between the cylinder and the engine body (the length is greater than one stroke length), so as to prevent the lubricating oil in the engine body from leaking into the cylinder along the piston rod, thus no pollution is caused to the pump system. Oil free reciprocating vacuum pump has vertical and horizontal structures.

The application scope of reciprocating vacuum pump system is as follows: ① in the environment requiring vacuum cleaning; ② when the air bird needs to be recovered, the recovered gas can be filled in the air chamber to ensure the purity of the gas; ③ when the flammable and explosive gas is removed, the inert gas can be filled in the air chamber. Isolate the chamber to prevent air (suspicious auxiliary equipment) from leaking into the cylinder and avoid accidents.

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment

Flow of liquid ring vacuum pump

Flow of liquid ring vacuum pump

In the design of liquid ring vacuum pump, it is very important to determine the circumferential speed of impeller, because the circumferential speed has a great influence on the performance of vacuum pump, which can be said to be global. Other parameters of vacuum pump, such as critical compression ratio, limiting vacuum degree and efficiency, are closely related to circulation speed. Generally speaking, if the circulation speed is too small, the vacuum pump will not reach the predetermined critical compression ratio, and the limit vacuum will also be reduced, resulting in the narrow working range of the vacuum pump and the increase of the shaft power in the high vacuum area;

On the other hand, if the circulation speed is too high, although the critical compression ratio and the limit vacuum degree of the vacuum pump can be increased, the efficiency of the vacuum pump will be reduced and the shaft power will be increased. In addition, due to the influence of vaporization pressure of liquid ring medium, the critical compression ratio will not increase proportionally with the increase of circulation speed. Therefore, the cycle speed should not be too high. How to choose the circulating speed of vacuum pump reasonably, not only has excellent performance, but also has low energy consumption, which is a problem worthy of discussion in the design of liquid ring vacuum pump.

When the impeller rotates and drives the liquid to rotate to form a liquid ring, the liquid ring, as the boundary of the closed cavity, continuously obtains kinetic energy from the impeller in the suction area. At the large eccentric point of the impeller, the circumferential velocity of the impeller reaches a large value. In the compression area, the gas is compressed in the form of "active cooling", and a part of the kinetic energy obtained by the impeller is transferred to the gas when the force increases, so that the gas pressure increases The working process of liquid ring vacuum pump is actually the process of energy conversion in impeller, liquid ring and gas, which conforms to the energy level street law.

Water Ring Vacuum Pump Pipeline Correct Installation Method

Liquid Ring Vacuum Pump

Roots Vacuum Pump

Selection of liquid ring vacuum pump in power plant

Selection of liquid ring vacuum pump in power plant

Vacuum pump for power plant mainly includes centrifugal vacuum pump and liquid ring vacuum pump. Their working principles are similar, but their implementation methods are different. Liquid ring vacuum pump is widely used in civil engineering construction because of its safety, simple operation, economy, reliable operation, small dynamic and static contact area, oil-free lubrication, low operating noise and compact structure. Only by connecting the pipeline, gas source and power supply can it be put into commercial operation, which saves a lot of liquid resources.

Liquid ring vacuum pump has axial suction and exhaust and radial suction and exhaust. The advantages of axial suction and exhaust are simple structure, convenient maintenance, and the disadvantages are large hydraulic loss and low pump efficiency. The advantages of radial intake and exhaust are small hydraulic loss and high pump efficiency; the disadvantages are complex structure of gas distributor and high processing and installation accuracy. Foreign manufacturers of complete vacuum pump equipment mainly include American Nash company and German Siemens company;

It is the supporting equipment for the production of domestic steam turbine generator set. The operation practice shows that the domestic equipment can replace the imported equipment, and the domestic equipment has a greater price advantage than the imported equipment. Due to the advantages of performance and price, liquid ring vacuum pump system is not only widely used in 300, 600 MW and above units, but also widely used in many high-pressure and ultra-high pressure small and medium-sized units in recent years, replacing the original liquid injection and extraction system, bringing long-term benefits to power plants.

Liquid Ring Vacuum Pump Cavitation And Prevention Method

Liquid Ring Compressor

Positive Displacement Vacuum Pump

vacuum pump in alumina plant Selection

vacuum pump in alumina plant Selection

When choosing vacuum pump, alumina plant should pay attention to the following points when considering suction pressure:

① When the carbonation decomposition rate of the filter is too high (commonly known as "over head"), the slurry is suspended, which pastes the filter cloth like jelly, so it is difficult to filter, and the vacuum degree increases rapidly.

② The particle size of aluminum hydrogen in the slurry from the carbon separation tank of alumina production system by sintering process is uneven, especially containing some ultra-fine aluminum hydrogen particles, which is easy to block the filter cloth, and the aluminum hydrogen slurry by sintering process is easy to harden the filter cloth, which will rapidly improve the vacuum degree.

③ Due to the loss along the way and other reasons, the suction pressure at the filter is always lower than the suction pressure at the inlet of the vacuum pump. According to the experience data of each workshop of our company, the loss is about 0.005MPa.

In addition, other accidents may occur. The flat plate filter has experienced a rapid increase in vacuum when washing the filter cloth. Therefore, the suction pressure of the pump should be more margin than normal.

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment

vacuum pump in vacuum grouting technology

vacuum pump in vacuum grouting technology

Vacuum grouting is a commonly used technology in bridge concrete structure, and grouting is a key link. The traditional grouting technology will cause corrosion and component expansion crack after long-term use, which has a great potential safety hazard.

Vacuum grouting is a new technology in the construction of post tensioned prestressed concrete structure, which solves the problems left by the traditional grouting technology to a large extent. The adoption of vacuum grouting technology is an effective measure to improve the safety and durability of post tensioned prestressed concrete structure.

The main application of vacuum pump in vacuum grouting is that one end of the duct is vacuumized by vacuum pump to produce a vacuum of about - 0.1pA, and then the optimized special cement slurry is poured from the other end of the duct to fill the whole duct with a positive pressure of ≤ 0.7MPa to improve the fullness and compactness of the prestressed duct grouting.

Water Ring Vacuum Pump Installation Instructions

Dry Scroll Vacuum Pump

Dry Screw Vacuum Pump

liquid ring vacuum pump cavitation phenomenon

liquid ring vacuum pump cavitation phenomenon

The principle of cavitation damage of liquid ring vacuum pump is the same as that of centrifugal pump. It is at the place where the bubbles are produced and broken, and there is cavitation on the metal surface, which will cause honeycomb damage seriously. If there is a large residual stress in the cavitation part of the vacuum pump impeller, it will cause stress release and crack.

Because of the pump cavitation, the bubble burst continuously in the high pressure area, and accompanied by strong water hammer, the surface produced noise and vibration. You can hear the sound of chopping like peas. The results show that the vibration frequency caused by cavitation is 600 ~ 25000hz and the pressure is 49MPa

If the above bubbles break on the metal surface, the metal surface will be subjected to continuous and strong water hammer, and there will be pockmarks, the metal grains will loosen and peel off to form honeycomb, or even perforation. In addition to mechanical action, cavitation damage is accompanied by many complex actions such as electrolysis and chemical corrosion. The actual damage shows that the location of cavitation damage is exactly where the bubble disappears.

Liquid Ring Vacuum Pump Troubleshooting

SK Series Water Ring Vacuum Pump And Compressor

How To Deal With The Vibration Of Liquid Ring Vacuum Pump

water ring vacuum pump characteristic curve

water ring vacuum pump characteristic curve

For different types of water ring vacuum pumps, the suction volume flow curve is related to the suction volume cavity and the size of the suction port: when the suction port is small and the suction volume cavity is relatively large, the suction volume flow will increase with the suction pressure increasing; when the suction volume cavity is relatively small, the suction volume flow will fill the whole cavity with the suction pressure increasing and the suction volume flow increasing to a certain value When the suction pressure is increased, the suction volume flow will remain the same. When the suction port is large and the suction volume cavity is relatively small, the speed of air filling the cavity is faster to keep the suction volume flow unchanged. When the inspiratory pressure increases to a certain value, the inspiratory pressure in the volume cavity will increase and the inspiratory volume flow will decrease due to the constant inspiratory volume cavity and the continuous increase of the maximum flow rate of the inspiratory gas.

When the water ring pump is running, its suction temperature, working water temperature and suction cavity remain unchanged. According to the gas state equation PV = MKT, the suction mass flow is basically proportional to the suction pressure, that is, P1 / P'1 ≈ M1 / m'1

According to the relationship between inspiratory mass flow and inspiratory volume flow, with the increase of inspiratory pressure, inspiratory volume flow begins to increase, and then slowly decreases.

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment

What is the discharge pressure of vacuum pump

What is the discharge pressure of vacuum pump?

When the vacuum pump is working, it will continuously exhaust the air from the pump body to form the vacuum degree required by the work at the suction port, that is to say, the exhaust pressure is another main factor affecting the operation efficiency of the water ring vacuum pump.

The exhaust pressure will have a huge impact on the suction capacity and the power consumption of the shaft operation of the vacuum pump. When the vacuum pump system is running, if its exhaust pressure is greater, the suction capacity of the vacuum pump will be smaller, and the power consumption of the corresponding shaft operation will be greater. On the contrary, when the exhaust pressure of the system is smaller, the suction capacity of the vacuum pump will be larger, and the power consumption of the corresponding shaft operation will be smaller.

Therefore, in the actual operation and maintenance process, the exhaust pressure data of the vacuum pump system should be observed in real time. In case of abnormal exhaust pressure data, corresponding measures should be taken immediately to update and reconstruct the whole vacuum system, so that the exhaust pressure of the vacuum system can be maintained in the range of national standards or recommended by the manufacturer for a long time, and the vacuum pump can always be in the optimal working condition Effectively improve the overall operation mechanical efficiency of water ring vacuum pump.

Remanufactured Vacuum Pumps

Dry Type Oilless Vacuum Pumps

Liquid Ring Vacuum compressor

What are the types of water ring vacuum pumps

What are the types of water ring vacuum pumps?

The water ring vacuum pump in use has single-stage, multi-stage and single-stage cascade ejector series connection water ring vacuum pump. The two-stage water ring vacuum pump has a higher limit vacuum than the single-stage water ring vacuum pump, and the suction curve drops flat, so it is suitable for the work situation where a larger suction capacity is still needed under a higher vacuum.

The two-stage water ring vacuum pump can also be used as a secondary booster pump for high vacuum pumps such as water vapor jet. The two-stage water ring vacuum pump is a two-stage impeller connected in series on the same shaft, and the main shaft is directly connected with the driving device. There are two modes of operation when the two-stage water ring vacuum pump is used for vacuumizing the condenser in the power station: under the starting condition of low vacuum, the absolute pressure of the condenser and other vacuum systems is 14665.2pa, which can be operated in one stage; under the normal operating condition of high vacuum, the absolute pressure of the condenser is 5999.4pa, which can be operated in two stages.

The serial vacuum pump used in the power station is to connect a ejector to the inlet of the water ring vacuum pump to improve the suction vacuum. The air is used as working medium, which is ejected from the nozzle at high speed. The ejected gas is drawn out, and then enters the water ring vacuum pump, where it continues to be compressed. Finally, the gas and water are discharged out of the tank.

Liquid Ring Vacuum Pump Knowledge

Liquid Ring Vacuum Pump Maintenance Skills

2BV2-071 Liquid Ring Vacuum Pump

vacuum pump repair method

vacuum pump repair method

Vacuum pump is widely used in industry and mining, and also in other fields. Because the vacuum pump is in a relatively bad working environment, it will inevitably corrode the vacuum pump. This problem has been puzzling many customers and enterprises, but it can not be effectively solved. In view of this problem, technicians have found the repair method of vacuum pump corrosion through research and analysis. Now let's share with you:

1. Surface treatment: thoroughly remove the surface oxide layer and clean the surface with acetone.

2. Mixing material: mix in strict accordance with the proportion, and mix evenly until there is no color difference.

3. Coating material: apply a thin layer of material first, ensure the bonding and full coverage, and then evenly apply the material to the repair surface to achieve the required repair thickness.

4. Curing: 24 hours / 24 ℃ (material temperature). When the material temperature is increased by 11 ℃, the curing time will be shortened by half, but the rising temperature shall not exceed the bearing temperature of the material.

5. Installation and precautions: the installation shall be carried out according to the assembly requirements. The materials for repair and protection shall not be knocked or impacted by external forces. If the materials affect the assembly, the method of grinding can be used. It is not allowed to knock to avoid damaging other materials.

industrial vacuum pumps,vacuum furnaces

2BE3 Series Liquid Ring Vacuum Pump

2BV series Liquid ring vacuum pump

Vacuum system details

Vacuum system details

Many places can't do without the use of vacuum pump unit, but in use, some places are easy to be ignored. In order to prevent unnecessary losses to users during use, we need to understand: where is easy to be ignored when using vacuum pump unit?

Generally, the head of the vacuum pump is very high. For the centrifugal water ring vacuum pump, after determining the model, the power consumption is proportional to the actual flow of the pump. The flow will also decrease with the increase of the head, such as high head, small flow and small power consumption.

In order to prevent motor overload, vacuum pump unit will require the actual pumping head of vacuum pump, which can not be 60% lower than the calibrated head. Therefore, when the high head is used to pump water with too low head, the motor capacity overload will heat up, and in serious cases, the motor will burn down. In case of emergency use, a gate valve shall be connected to the water outlet pipe to regulate the water output, so as to reduce the flow and prevent the motor overload.

It should be noted that if the motor heats up and the motor is too hot, it is necessary to turn off the water outlet flow or shut down in time. Many people will misunderstand this. Some operators will think that blocking the water outlet and forcibly reducing its flow can increase the motor load. This is not the case at all. Therefore, when using the vacuum pump unit, the problem of motor temperature rise should be solved in time.

How To Maintain Water Ring Vacuum Pump

Liquid Ring Vacuum compressor

Water ring vacuum pump

What kind of vacuum pump is environmentally friendly and energy-saving

What kind of vacuum pump is environmentally friendly and energy-saving

The energy and environmental problems of vacuum pump have attracted the attention of all countries in the world. The products after the market are no longer practical, but towards the direction of environmental protection, energy saving and convenience. Vacuum pump thinks that: vacuum pump products are no exception, in order to stand in the fierce market competition, we should focus on energy saving and environmental protection in time.

In order to promote energy conservation in the whole society, improve energy utilization efficiency and economic efficiency, protect the environment, ensure the development of national economy and society, and meet the needs of people's life, the latest "energy conservation law of the people's Republic of China" is promulgated by the state. Article 39: the State encourages the development of general energy-saving technology, gradually realizes the economic operation of electric motor, fan, pump equipment and system, develops electric motor speed regulation and power electronic energy-saving technology, develops, produces and promotes high-quality and cheap energy-saving equipment, and improves the efficiency of electric energy utilization. Hokkaido mall and many people in the vacuum industry agree that the vacuum industry has The market with great potential is optimistic about vacuum products with energy conservation and environmental protection.

Some processes in chemical production often need to be carried out under atmospheric pressure. A vacuum pump is a mechanical device that obtains absolute pressure lower than atmospheric pressure.

Water Ring Vacuum Pump Common Faults

Water Ring Vacuum Pump Scaling Causes And Preventive Measures

Liquid Ring Vacuum Pump Operation

rotary vane vacuum pump characteristics

rotary vane vacuum pump characteristics

What are the characteristics of rotary vane vacuum pump?

The feature of the rotary vane vacuum pump is to use the vacuum pump oil to seal and lubricate. Refueling is the feature of the rotary vane vacuum pump. In order to seal the sealing clearance, fill the clearance volume and lubricate the moving parts, the moving parts of the rotary vane vacuum pump are submerged in the vacuum pump oil.

The pumping rate of rotary vane vacuum pump is 0.0005 ~ 0.150m3/s, the limiting pressure is 1pA, and the working pressure range is 1.3332x10 ~ 1.3332x104pa.

The rotary vane vacuum pump is suitable for extracting dry gas or gas containing a small amount of condensable vapor. It is not suitable to extract gases with dust, high oxygen content, explosive, corrosive and chemical reaction to vacuum pump oil. It is used for vacuumizing general laboratory and small equipment.

Dry Screw Vacuum Pump

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

vacuum pump structure type

(1) Overall structure type of pump

The overall structure of the vacuum pump is determined by the arrangement of the pump body.

The vertical structure has horizontal inlet and outlet, and it is convenient to assemble and connect pipelines. But the center of gravity of the pump is high, and its stability is poor at high speed, so this type of pump is mostly used for small pump.

The air inlet of the horizontal pump is on the top and the air outlet is on the bottom. Sometimes, in order to facilitate the installation and connection of vacuum system pipes, the exhaust port can be connected from the horizontal direction, that is, the inlet and exhaust directions are mutually perpendicular. At this time, the exhaust port can be opened from the left or right direction. In addition to connecting one end of the exhaust pipe, the other end is blocked or connected with the bypass valve. The pump has low center of gravity and good stability at high speed. Generally, large and medium-sized pumps use this structure.

The two rotor shafts of the pump are installed vertically with the horizontal plane. The assembly clearance of the structure is easy to control, the rotor is easy to assemble and the pump occupies a small area. However, the center of gravity of the pump is high and the gear is inconvenient to be disassembled, and the lubricating mechanism is relatively complex.

 

(2) Transmission mode of pump

The two rotors of vacuum pump are operated synchronously by a pair of high precision gears. The driving shaft is connected with the motor through the coupling. There are mainly two types of transmission structure arrangement: one is that the motor and gear are placed on the same side of the rotor as shown in the figure. Driven rotor is directly driven by the motor end gear, so that the torsional deformation of the active rotor shaft is small, the gap between the two rotors will not be changed due to the large torsional deformation of the active shaft, so that the gap between the rotors is even in the operation process. The biggest disadvantages of this kind of transmission mode are: A. There are three bearings on the driving shaft, which increases the difficulty of pump processing and assembly, and the disassembly and adjustment of gears are also inconvenient; B. the overall structure is uneven, and the center of gravity of the pump is inclined to one side of the motor and gearbox.

Water Ring Vacuum Pump Performance Test

Roots Vacuum Pump

Dry Scroll Vacuum Pump

What are the classifications of mechanical vacuum pumps

What are the classifications of mechanical vacuum pumps

Vacuum pump is a device which can produce, improve and maintain vacuum in a closed space by various methods. Vacuum pump can be defined as a device or equipment that uses mechanical, physical, chemical or physical chemical methods to extract air from the container to obtain vacuum. With the development of vacuum application, there are many kinds of vacuum pumps, whose pumping speed is from 0.5 liter per second to hundreds of thousands and millions of liters per second. Limit pressure (limit vacuum) ranges from coarse vacuum to ultra-high vacuum above 10-12pa.

Due to the wide range of working pressure involved in the vacuum application department, it is impossible for any type of vacuum pump to be fully applicable to all working pressure ranges. Different types of vacuum pumps can only be used according to different working pressure ranges and different working requirements.

In order to use conveniently and meet the needs of various vacuum processes, various vacuum pumps are sometimes combined according to their performance requirements and applied in the form of units. A pump that uses mechanical movement (rotation or sliding) to obtain vacuum is called a mechanical vacuum pump. According to its working principle and structural characteristics, mechanical vacuum pump is described as follows:

Variable volume vacuum pump is a vacuum pump which uses the periodic change of the volume of the pump cavity to complete suction and exhaust to achieve the purpose of suction. The gas is compressed before being discharged from the pump chamber. This kind of pump is divided into reciprocating type and rotary type.

Water Ring Vacuum Pump Operation Procedure

Liquid Ring Vacuum Pump Characteristics And Application

Liquid Ring Vacuum Pump Description

How to maintain the vacuum pump

How to maintain the vacuum pump?

First of all, the user should check the oil level frequently, and adjust it to meet the requirements if it does not meet the requirements. When the vacuum pump is running, the oil level shall be up to the center of the oil mark. Check the oil quality frequently, replace the new oil in time in case of oil deterioration, and ensure the vacuum pump works normally. The oil change period shall be considered according to the actual use conditions and whether it can meet the performance requirements, etc., which shall be determined by the user at his discretion. General new vacuum pump, when pumping clean and dry gas, it is recommended to change oil once in about 100 hours. After no ferrous metal powder can be seen in the oil, the oil change period can be appropriately extended in the future.

Generally, the vacuum pump shall be overhauled after 2000 hours of operation to check the aging degree of rubber seal, check whether the exhaust valve plate is cracked, and clean the dirt deposited on the valve plate and exhaust valve seat. Clean the parts in the whole vacuum pump, such as rotor, spinner, spring, etc. It is usually washed with gasoline and dried. Clean rubber parts and dry them with dry cloth. When cleaning and assembling, handle with care to avoid damage.

If possible, the pipe shall also be cleaned to ensure that the pipeline is unblocked.

After reassembling the vacuum pump, the test run shall be carried out. Generally, the vacuum pump shall be idle for 2 hours and the oil shall be changed for two times. Because there will be a certain amount of volatile matters left in the vacuum pump during cleaning. After normal operation, the vacuum pump shall be put into normal operation again, and the pipeline and joint of the vacuum pump shall be checked for looseness. Turn the vacuum pump by hand to see if it is flexible. Add bearing lubricating oil into the bearing, observe that the oil level should be at the center line of the oil mark, and replace or supplement the lubricating oil in time.

At the beginning of use, close the gate valve, outlet pressure gauge and inlet vacuum gauge of the water outlet pipe, jog the motor, and try to see whether the motor rotation is correct. Start the motor. When the vacuum pump is in normal operation, open the outlet pressure gauge and the inlet vacuum pump. Gradually open the gate valve and check the motor load after the appropriate pressure is displayed. Try to control the flow and head of the vacuum pump within the range indicated on the label to ensure that the vacuum pump operates at the highest efficiency point, so as to achieve the maximum energy saving effect. During the operation of vacuum pump, the bearing temperature shall not exceed the ambient temperature of 35C, and the maximum temperature shall not exceed 80C. In case of any abnormal sound of vacuum pump, stop the pump immediately and check the cause.

To stop using the vacuum pump, first close the gate valve and pressure gauge, and then stop the motor. In the first month of operation, the vacuum pump changes the lubricating oil after 100 hours, and then every 500 hours. Adjust the packing gland frequently to ensure that the leakage in the packing chamber is normal (it is better to leak out in drops). Check the wear condition of the shaft sleeve regularly, and replace it in time when the wear is large. When the vacuum pump is used in cold winter, it is necessary to unscrew the drain plug at the lower part of the pump body to drain the medium after stopping. Prevent frost cracking. If the vacuum pump is out of service for a long time, it is necessary to disassemble the pump completely, dry the water, coat the rotating parts and joints with grease, and properly store them.

Liquid Ring Vacuum Pump

Roots Vacuum Pump

industrial vacuum pumps,vacuum furnaces

How to operate roots vacuum pump better

How to operate roots vacuum pump better

In order to improve the quality of Roots vacuum pump, it is necessary to improve the development of its overall application strength in combination with the application of the product, and constantly realize the overall drive of the product application ability, so that it can enhance the continuous improvement of its quality advantage under the function of reasonable application, and make it reflect the internal application advantage in the development process.

1. Low wind pressure and high current: this kind of situation occurs more often. The main reason is that the dust on the filter screen at the inlet of Roots vacuum pump is not cleaned in time. If the filter screen is cleaned carefully, the problem will be solved. This requires us to clean the filter screen frequently in the production to ensure the smooth inlet of Roots vacuum pump, which is not only conducive to the operation of the equipment, but also will not affect the calcination.

2. Impact between impeller and impeller of Roots vacuum pump: displacement of gear teeth; the elimination method is to adjust the clearance and tighten it. Over rated pressure operation; the troubleshooting method is to check the cause of over pressure before troubleshooting. The tooth surface is worn and the tooth gap is increased, resulting in the change of the clearance between impellers; the elimination method is to adjust the clearance.

3. Roots vacuum pump shell vibration: reason 1, in the use process did not do a good job in maintenance work. Reason 2: the use time of roots drum vacuum pump is too long. When disassembling the machine, measure the matching dimensions of the machine.

What’s The Liquid Ring Vacuum Pump

Dry Scroll Vacuum Pump

Dry Screw Vacuum Pump

Cavitation phenomenon of liquid ring vacuum pump

Cavitation phenomenon of liquid ring vacuum pump

When the liquid ring vacuum pump is working, at a certain temperature, when the liquid pressure at the low pressure is lower than the vaporization pressure (i.e. saturated steam pressure) at that temperature, the liquid starts to vaporize and generate bubbles. When the liquid enters the high pressure area, the bubbles break, and the surrounding liquid quickly fills the original bubble holes, generating hydraulic impact. The generation, development and rupture of bubbles are called cavitation.

In the working process of the liquid ring vacuum pump, the absolute pressure of the suction area is consistent with the absolute pressure of the pumped system. In other words, the higher the vacuum degree of the system being pumped, the higher the vacuum degree of the suction area.

Liquid ring vacuum pump needs liquid as working medium. Each liquid has a corresponding saturated vapor pressure at a certain temperature. When the absolute pressure in the suction area is closer to the saturated vapor pressure of the liquid, the liquid is closer to boiling state. At this time, there will be a large number of bubbles on the surface of the working fluid in the suction area. Because the working fluid steam generated by the liquid in the working cavity will occupy part of the working cavity space, the external suction capacity of the pump will be reduced. When the pressure in the suction area reaches the saturated steam pressure of the working liquid, it can be considered that the working cavity is full of working liquid steam. At this time, the suction capacity of the pump is close to 0, and the cavitation phenomenon of the pump is the most serious.

If the working fluid is water, the higher the water temperature is, the more the pumping performance of the pump will decline. The influence of water temperature on the pumping rate of water ring vacuum pump

The principle of cavitation damage of liquid ring pump is the same as that of centrifugal pump. It is at the place where bubbles are produced and broken. Pitting occurs on the metal surface and honeycomb damage will occur seriously. If there is a large residual stress in the cavitation part of the vacuum pump impeller, it will cause stress release and crack.

Because of the pump cavitation, the bubble in the high-pressure area of continuous sudden rupture, and accompanied by a strong water hammer, resulting in noise and vibration. You can hear the crackling like peas. The experimental results show that the vibration frequency range is 600-25000hz and the pressure is 49MPa.

Vacuum Pump Selection And Calculation

Water Ring Vacuum Pump Performance Characteristics

Liquid Ring Vacuum Pump Model

Installation method of liquid ring vacuum pump pipeline

Installation method of liquid ring vacuum pump pipeline

1. The exhaust pipe of liquid ring vacuum pump or compressor is connected with the intake pipe of gas-water separator. When used as compressor, the exhaust pipe of gas-water separator is connected with the system using compressed gas. Generally, the pipeline shall not be too long and the turning shall not be too fast. When it is used as a vacuum pump, the gas is discharged to the atmosphere from the air outlet of the gas water separator. In order to improve the working environment, the gas can be discharged to the outside of the working place through the pipeline. Installation method of liquid ring vacuum pump pipeline

2. Gasket shall be used to make the flange connection of liquid ring vacuum pump reliable. Especially, if the air inlet of the pump is slightly not tight, it cannot reach the predetermined vacuum degree.

3. The intake pipe of liquid ring vacuum pump or compressor shall be equipped with warehouse valve, so as to shut down the pump or compressor first when stopping, so as to prevent the water in the vacuum pump or compressor from returning to the system under the pressure of the exhaust pipe. In order to facilitate the work, it is better to install a vacuum gauge between the air inlet and the valve, so as to check whether the vacuum work normally at any time. When the water ring vacuum pump is used as a compressor, a gate valve shall be installed on the exhaust pipe of the gas-water separator, and a pressure gauge shall be installed between the exhaust pipe and the valve, so as to check whether the pressure of the compressed gas water ring vacuum pump reaches the required pressure at any time.

Dry Type Oilless Vacuum Pumps

Liquid Ring Vacuum compressor

Water ring vacuum pump

Selection method of 2BV water ring vacuum pump

Selection method of 2BV water ring vacuum pump

At present, the manufacturers of 2BV water ring vacuum pump in the market are close to saturation and the users' usage is increasing. However, many new users don't have a special understanding of 2BV water ring vacuum pump. They often refer to the purchase situation of other customers in the same industry to choose efficient and professional 2BV water ring vacuum pump. But in fact, 2BV water ring vacuum pump mainly depends on the exhaust pressure required by the vacuum degree required by the air volume required by the customer's work, so the customer should consider the appropriateness of these aspects when purchasing.

Three selection methods of 2BV water ring vacuum pump

I. specifications with lower speed

At present, the most widely used axial suction and exhaust single acting 2BV water ring vacuum pump in the market, with multiple rotating speeds for products of the same specification. Compared with the large-scale 2BV water ring vacuum pump, the impeller is larger and the rotating speed is lower. It can be found that the rotating speed of the large-scale pump is lower, the power consumption is smaller and the operating efficiency is higher. Therefore, it is recommended that customers choose the products with lower rotating speed when purchasing 2BV water ring vacuum pump.

II. Water temperature impact should be considered

At present, the performance curve and technical parameters of 2BV water ring vacuum pump design in the market have some errors with the actual water supply temperature of most users' products in the domestic market. Therefore, when choosing the 2BV water ring vacuum pump, the customer needs to choose the product whose technical parameters are slightly higher than the actual water temperature when leaving the factory, so as to avoid the phenomenon that the water temperature is too high and cannot be used normally in actual use.

III. Effect of suction resistance

For some customers in special industries, the distance between the gas suction location of 2BV water ring vacuum pump and the vacuum pump needs to be considered. The greater the distance, the greater the loss of suction resistance will increase accordingly. Therefore, when selecting the high-performance 2BV water ring vacuum pump, it is necessary to consider the thickness and straight curve of the pipeline, try to follow the principle that the pipeline should be thick, not thin, not straight, not curved, and reduce the right angle elbow to improve the suction efficiency of 2BV water ring vacuum pump.

The above technical points are problems that customers often encounter in the actual use process. Therefore, customers should first avoid the above possible problems when purchasing 2BV water ring vacuum pump. If customers have special requirements, manufacturers can provide corresponding technical parameters according to the actual needs so as to fully meet the use needs of customers.

Cone Two Stage Water Ring Vacuum Pump In Power Plant

Dry Scroll Vacuum Pump

Dry Screw Vacuum Pump

How to prevent the overload of Roots vacuum pump

How to prevent the overload of Roots vacuum pump

The power required by roots vacuum pump to compress gas is directly proportional to the pressure difference. Once the air pressure difference is too high, the roots pump may be overloaded, which will cause the motor winding to burn down. How to prevent overload of Roots vacuum pump is as follows:

(1) use mechanical automatic pressure regulating bypass valve

The bypass valve is installed on the through pipe side between the outlet and inlet of Roots vacuum pump. The valve controls the pressure difference between the inlet and outlet of the pump not to exceed the rated value. When the pressure difference reaches the rated value, the valve will automatically open through the pressure difference, so that the outlet and inlet of Roots vacuum pump are connected, and the pressure difference between the inlet and outlet is rapidly reduced. At this time, the roots vacuum pump almost no pressure difference. When the pressure difference is lower than the rated value, the valve will close automatically and the gas will be pumped out from the front stage pump to roots vacuum pump. Roots vacuum pump with bypass overflow valve can be started at the same time with the previous pump, so that the equipment is easy to operate.

(2) use hydraulic coupling

The use of hydraulic coupling can also prevent overload of Roots vacuum pump, thus allowing roots vacuum pump to operate under high pressure difference. The hydraulic coupling is installed between the pump and the motor. Under normal operating conditions, the hydraulic coupling transmits the rated torque from the motor end to the pump. The maximum pressure difference of Roots vacuum pump is determined by the maximum torque transmitted by the hydraulic coupling, and the maximum torque transmitted by the hydraulic coupling is regulated by the amount of liquid in it. When roots vacuum pump works under high pressure difference or starts at the same time with the front pump, the speed difference will slip inside the hydraulic coupling, and only transfer a certain torque to slow down the pump. With the pumping process, the gas load is reduced, and the roots vacuum pump is gradually accelerated to the rated speed.

 

(3) use vacuum electronic components to control the inlet pressure of Roots vacuum pump

Pressure sensitive components (such as vacuum bellows relay or electric contact vacuum gauge) are placed on the inlet pipeline of Roots vacuum pump. After starting the vacuum system, when the pressure at the inlet of the roots vacuum pump is lower than the given value (allowable starting pressure of the pump), the pressure-sensitive component will send a signal and the electric control system 020 - will open the 0 (if the vacuum system is equipped with roots vacuum pump) through line, and then close the side through line valve. If the pump inlet pressure is higher than the specified value, the roots vacuum pump will automatically close (or simultaneously open the line valve beside the pump), so as to ensure the reliable operation of Roots vacuum pump.

Vaccum Pump For Phenolic Resin

Customized Vacuum System In Industry

Vaccum Pump For Vapour Oil

high speed direct vane vacuum pump Introduction

high speed direct vane vacuum pump Introduction

High speed direct vane vacuum pump, referred to as direct pump. It is a new branch product of rotary vane vacuum pump. The main type is 2XZ high-speed direct vane vacuum pump.

The old rotary vane pump appeared earlier. It is a product with simple structure and wide application. However, the rotating speed of the old rotary vane pump is low, mostly around 400R / min. The belt drive is adopted to reduce the speed, so the volume is large and the weight is heavy. In order to make the pump body small and light, it can be seen from the calculation theory of the pump geometry pumping speed that when the pumping speed is fixed, the main means is to increase the pump speed. The key to improve the speed of vacuum pump is to make the parts directly bearing high speed load adapt to this working condition, that is, the material of pump body and rotor and the structure of rotor should adapt to the working condition after the speed is increased.

The direct vane pump adopts the motor to drive the pump rotor directly, and the speed is increased to more than 1400R / min. In this way, the structure of the pump is compact; the volume is significantly reduced; the weight is reduced; the pumping performance of the pump is improved; the vibration and noise are greatly reduced.

2XZ type direct coupled vacuum pump is a two-stage high-speed direct coupled rotary vane vacuum pump. This pump is the basic equipment used to extract gas from the sealed vessel to obtain vacuum. It can be used alone, and can also be used as the front pump and pre pump of various high vacuum systems.

VACUUM FURNACE

industrial vacuum pumps,vacuum furnaces

Heat treatment equipment

Selection of screw vacuum pump

Selection of screw vacuum pump

When the screw vacuum pump is used to pump sludge and other media containing solid particles, the pressure of the screw pump is relatively large, generally reaching 0.6mpa-1.2mpa.

The screw vacuum pump is a kind of positive displacement pump with internal engagement and eccentric rotation. The main components of the pump are: a single screw rotor and a stator with double screw, which is usually made of elastic materials. When the rotor rotates around the axis of the stator in the cavity, the closed wrist formed between the rotating stators will move along the rotor's spiral line. Therefore, the medium will be continuously and uniformly And the volume is constant from the suction to the discharge. Based on this feature, the screw pump is particularly suitable for the following working conditions.

High viscosity medium delivered by screw pump: medium with viscosity of 37000-200000 MPA can be delivered according to different pump sizes.

Medium containing particles or fibers: the particle diameter can be 30mm (not more than the eccentricity of rotor). The fiber length can be 350mm (equivalent to the pitch of 0.4-position rotor). Its content is generally up to 40% of the medium cellar. If the solid in the medium is fine powder, the highest content can reach 60% or higher. When it is required that the conveying pressure is stable and the inherent structure of the medium is not damaged, the screw pump is the best choice for conveying.

Screw vacuum pump is widely used in wastewater treatment plant to transport water, wet sludge and flocculant liquid because of its variable transportation, strong self-priming ability, reversibility and ability to transport liquid containing solid particles. The selection of screw pump should follow the principle of economy, rationality and reliability. If the design and selection are not considered carefully, it will bring trouble to the later use, management and maintenance. Therefore, choosing a reasonable and reliable screw pump according to the actual production needs can not only ensure the smooth production, but also reduce the repair cost.

How To Prevent Vacuum Pump Corrosion

Dry Scroll Vacuum Pump

Dry Screw Vacuum Pump

Advantages of steam treatment device in vacuum system

Advantages of steam treatment device in vacuum system

In the process of vacuum drying of electrical products, such as transformers, transformers, capacitors, etc., it is required that the vacuum system can pump out a large number of water vapor and solvents in a certain pressure range, and at the end of drying, it must reach a lower limit pressure.

For example, for a medium-sized transformer, the moisture content of the insulating material is as high as 400-500kg, and the whole drying cycle is 70h. Under the inlet pressure of 45mbar, the vacuum system is required to pump 90% - 95% of the moisture content within 48h, that is, the capacity of pumping steam per hour is about 15kg, and it still recovers to the original limit pressure of 10-2mbar after drying.

I. principle of steam treatment device

In the vacuum state, when the temperature of water or steam is higher than the boiling point, they enter the pump cavity in the state of gas.

The slide pump itself is a heating source, and the liquid ring pump provides a low pressure for the separator of the slide pump, so the water or other steam discharged to the separator is also in a vacuum state, and the temperature is high enough to keep them in a gas state, and any tiny liquid drop will be evaporated in the separator.

The water or other steam discharged to the liquid ring pump becomes part of the sealing liquid after being condensed due to the low temperature in the liquid ring pump.

In order to prevent the steam from being condensed in the pump, the oil temperature of the pump must be high enough, generally set in the range of 60-75, and the oil temperature higher than 80 will cause the vacuum pump oil to be oxidized. The required oil temperature can be controlled by automatically adjusting the cooling water entering the slide pump.

Vacuum Pump For Vacuum Induction Melting Machine

2BV Water Ring Vacuum Pump For Water Vapor

Dry Scroll Pump