What should be paid attention to in the selection of vacuum pump unit

What should be paid attention to in the selection of vacuum pump unit?

Water ring vacuum pump unit is widely used in chemical and pharmaceutical projects. In order to better select the type, combined with practical engineering experience, this paper discusses the selection and use of 2BV water ring vacuum pump unit from its principle, process, equipment selection, layout, energy saving measures, etc. 2BV series water ring vacuum pump unit is used to pump air and other non corrosive, water-insoluble and solid particles free gases, so as to form a vacuum in a closed container, and a large number of liquids are allowed in the suction gas.

Because in the course of the task of 2BV series water ring vacuum pump unit, the gas tightening process is isothermal, so when tightening and pumping flammable and explosive gas, it is not easy to explode, so its use is more and more common. This equipment can also be used for water diversion of large pumps. When used as a compressor, its pressure is as high as 0.26mpa (absolute pressure).

The equipment of water ring vacuum pump unit used in extraction workshop is mainly the equipment with requirements for vacuum degree, such as double effect diluter and spherical diluter. The impeller 3 of the water ring vacuum pump unit is installed in the pump body fairly. When starting, a certain height of water will be injected into the pump.

JZP2H type Roots and piston Vacuum system



JZPX series roots-rotary pump system



JZJ2B Roots-Liquid Ring Pump System

Oil change treatment of vacuum pump

Oil change treatment of vacuum pump

Because chemical or pharmaceutical related process gas will contain flammable, explosive and corrosive gases to varying degrees, and because of this, dry vacuum pump also needs special treatment for us. For the internal structure of dry screw vacuum pump is simple, two rotors and pump cavity should also be treated with anti-corrosion measures. At this time, nickel phosphorus coating and Teflon coating should be selected.

Claw vacuum pump is more difficult to do anti-corrosion treatment, there is almost no way to do surface treatment between all levels of diaphragms, so the anti-corrosion coating on the rotor surface is easier to be assembled without damage. Oil free vortex vacuum pump is only suitable for pumping clean gas, at this time, it is not allowed to pump flammable, explosive and corrosive gas.

When it comes to oil change of vacuum pump equipment, we should pay attention to oil change once after three to half a year's continuous operation. In areas with high humidity, pumps working in wet seasons, or pumps polluted by pumped gas, in this case, we should pay attention to shortening oil change time according to specific conditions to a large extent. Between.

When changing oil for vacuum pump equipment, first remove the vacuum system of the pump, and then pad one end of the chassis motor higher, open the drain plug to drain oil, rotate the vacuum pump, cover the exhaust port, so that all the dirty oil in the cavity is discharged from the drain port, and then add 100-500ml of new oil from the intake port to continuously rotate for more than 5-10 revolutions to clean the interior. Follow this operation 3-5 Second, after the special dirty oil is drained, install the drain plug, level the pump, add new oil from the air inlet and the oil filling hole respectively, and the oil change is completed.

When the vacuum pump equipment is changing oil, it is not suitable to start the motor for a long time, which will make the exhaust valve plate jump too violently and fatigue; when changing oil of vacuum pump equipment, it is also prohibited to clean the pump with kerosene, gasoline, alcohol and other non disassembly methods; if the pump stops for a long time, it is necessary to take off the exhaust hood and put on the exhaust plug, close the air inlet and drain the accumulated water.

Rotary Vane Vacuum Pump In Manipulator Industry

ZJ Roots Vacuum Pump

Liquid Ring Vacuum compressor

dry mechanical vacuum pump application

dry mechanical vacuum pump application

First of all, we should pay attention to the fact that the dry mechanical vacuum pump is actually the polysilicon preparation process that will be applied in the low-pressure chemical vapor deposition; secondly, the dry mechanical vacuum pump is actually the semiconductor etching process. In these production processes, corrosive gases and related abrasive particles will be used or generated.

Moreover, in terms of the application of dry mechanical vacuum pump, in addition to the semiconductor process, some processes that generate particles do not want particles to be mixed into the pump oil, and it is hoped that this equipment will be used in addition to the particle discharge pump; in terms of distillation, drying, defoaming and packaging in the chemical industry, pharmaceutical industry or food industry, attention should be paid to prevent organic dissolution. It is suitable for dry vacuum pump.

Then, that is to say, it should be done before the general oil-free cleaning vacuum system pump, which is to prevent oil pollution.

Moreover, we should pay attention to the comparison of different vacuum pump performance. First of all, we should pay attention to the observation of the vacuum degree. The limit vacuum degree of dry screw vacuum pump, claw vacuum pump and oil-free scroll vacuum pump is relatively high, and the high limit vacuum will reach 1-2pa. Then, we should pay attention to the oil-free reciprocating vacuum. The pump is also the crude vacuum equipment. The limit vacuum is relatively low. It needs to be matched with roots vacuum pump to improve the limit vacuum.

As for the oil-free scroll vacuum pump, because of its internal structure, the air extraction is relatively small, which is only applicable to the process of small air extraction; the dry-type screw vacuum pump is relatively complete in model, at this time, it will be more applicable to the process of large air extraction. Next, I want to pay attention to the fact that it can cooperate with roots vacuum pump in large capacity To the extent that it can meet the needs of different types of customers.


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How to choose 2be vacuum pump

How to choose 2be vacuum pump

The working pressure of the 2be vacuum pump should meet the requirements of the process working pressure, and the vacuum degree should be higher than half to one order of magnitude of the vacuum degree of the vacuum equipment. (for example, the vacuum degree of 100 Pa (absolute pressure) is required for the vacuum process, and the vacuum degree of the selected vacuum pump shall be at least 50 pa-10 PA). Generally, if the absolute pressure is required to be higher than 3300pa, the water ring vacuum pump is preferred as the vacuum device. If the absolute pressure is required to be lower than 3300pa, the water ring vacuum pump cannot be selected, and the rotary vane vacuum pump or the vacuum pump of higher vacuum level can be selected as the vacuum obtaining device.

2be vacuum pump requires air extraction rate (that is, the capacity of vacuum pump to discharge gas, liquid and solid under its working pressure), general unit: m3 / h, L / s, m3 / min. The specific calculation method can refer to the following formula for self calculation and selection. Of course, the selection of vacuum pump is a comprehensive process, involving relevant experience and other factors.

Is the object to be pumped contaminated with rubber or oil? For different media to be pumped, corresponding vacuum equipment shall be selected. If there is a large amount of steam, particles and corrosive gas in the gas, corresponding auxiliary equipment, such as condenser, filter, etc., shall be installed on the air inlet pipeline of the pump

2BE1 Series Liquid Ring Vacuum Pump

2BE3 Series Liquid Ring Vacuum Pump

2SK Liquid Ring Vacuum Pump

new type of corrosion-resistant water ring vacuum pump

new type of corrosion-resistant water ring vacuum pump

Water ring vacuum pump is a kind of warm vacuum pump, which is suitable for pumping gas containing liquid. When pumping corrosive or explosive gas, it is often the first choice for designers. However, the original water ring vacuum pump produced by cast iron or carbon steel is not corrosion-resistant and can not guarantee the vacuum degree of the equipment stably for a long time: the service life is short, the comprehensive operation cost borne by the user is high, and the continuous production is inconvenient due to the frequent maintenance and replacement of the vacuum pump.

In order to solve the problem of corrosion resistance of water ring vacuum pumps, stainless steel pumps, ceramic pumps and composite lining pumps have been developed successively. These pumps have some improvement in corrosion resistance compared with traditional vacuum pumps, but there are still various deficiencies. Stainless steel pump has small corrosion resistance range and high cost; ceramic pump has poor toughness, is easy to be damaged and difficult to be replaced; composite corrosion-resistant lining pump has different material expansion coefficient due to the composite structure of different materials, which is easy to cause lining cracks, bulges, falling off and other problems.

At present, the corrosion-resistant water ring vacuum pump made of phenolic glass fiber reinforced plastics (commonly known as FRP) by hot pressing can completely solve the above problems. Table 1 is the data table of the corrosion resistance of phenolic FRP, stainless steel and cast iron or carbon steel. It can be seen from the table that the corrosion resistance of phenolic FRP is much better than that of stainless steel, cast iron and carbon steel in several common acid substances which cause serious corrosion to the equipment. Therefore, the water ring vacuum pump made of phenolic glass fiber reinforced plastic has obvious advantages in pumping various corrosive gases.

Liquid Ring Vacuum Pump

Liquid Ring Vacuum compressor

Water ring vacuum pump

Operating instructions of rotary vane vacuum pump

Rotary vacuum pump is a kind of vacuum pump with single and double pole high-speed direct connection structure. It is one of the basic equipment to discharge gas from sealed container. Rotary vacuum pump and motor shaft have the advantages of high speed, small shape, compact structure, convenient operation and strong mobility.

First of all, when unpacking, check whether the rotary vacuum pump you purchased is damaged during transportation and meets the use requirements. If you don't understand, please call our sales engineer immediately

Before using the rotary vane vacuum pump for installation and commissioning, please read the instructions carefully, operate in strict accordance with the product operation procedures, and pay attention to first screw out the oil filler plug from the oil filler hole to 2 / 3 of the oil mark. Then add a small amount of pump oil from the oil inlet hole to strengthen the lubrication in the pump cavity. If the oil level of exhaust valve is too low, it will not close and affect the vacuum degree. If it is too high, it may cause fuel injection.

Pay attention to the product manual, connect the three-phase power line as required, and note that the rotation direction of the three-phase motor is the same as the direction of the arrow on the pump bracket. The single-phase motor can be directly inserted into the power socket. After the test run is qualified, normal operation can be started.

The connecting pipe with the inlet pipe of rotary vacuum pump should not be too long. Please pay attention to check the external connecting pipe, connector and container of the vacuum pump.

Rotary Vane Vacuum Pump Guide

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Rotary Vane Vacuum Pump Operation Guide

Closed cycle system of liquid ring vacuum pump

Closed cycle system of liquid ring vacuum pump

The application of water ring vacuum pump is more and more extensive. Generally, after we master its use method, we will not understand its system components. The more we know about the closed-circuit circulation system of liquid ring vacuum pump, it will help us better use it and make it play a better role.

The closed-circuit circulation of liquid ring vacuum pump is a complete set of equipment composed of vacuum pump, steam water separator, heat exchanger and various pipeline accessories. Compared with a single vacuum pump, it is more convenient to install.

Because the working fluid can be recycled, the system greatly reduces the consumption of the working fluid and the pollution to the environment, so it is toxic in the extracted gas, and the extracted gas contains organic solvents and other occasions with obvious advantages. Vacuum pump closed-circuit circulation system can be used in most applications.

The above briefly introduces the closed-circuit circulation system of liquid ring positive air pump. After we understand its system significance, we can find out the root cause when using it, which is also helpful for us to use it for a longer time and improve our work efficiency.

air-cooled roots-liquid ring vacuum system

Open Cycle Water Ring Vacuum System

Closed Cycle Water Ring Vacuum System

2BE water ring vacuum pump Introduction

2BE water ring vacuum pump Introduction

A brief introduction of the 2be water ring vacuum pump is compiled. The 2be water ring vacuum pump is widely used in papermaking, chemical industry, petrochemical, light industry, pharmaceutical, food, metallurgy, building materials, stone tools, coal washing, mineral processing, chemical fertilizer and other industries.

It has the advantages of simple structure, convenient maintenance, reliable operation, high efficiency and energy saving. It can also adapt to the severe conditions such as large displacement, load shock wave and so on.

For the key parts of 2be water ring vacuum pump, such as distribution plate, impeller and pump shaft, the system optimization design is carried out, which simplifies the structure, improves the performance, realizes energy saving, adopts welded impeller, stamping and forming the blades at one time, and the profile is reasonable; on the whole processing of the network, the dynamic balance problem is fundamentally solved. The impeller and the pump shaft are equipped with a thermal interference fit, with reliable performance and stable operation. After the impeller is welded, the overall operation is good heat treatment, the blade has good toughness, so that the impact resistance and bending resistance of the blade can be fundamentally guaranteed, and the 2be water ring vacuum pump can adapt to the bad conditions of load shock wave.

The 2be water ring vacuum pump is equipped with air-water separator. There is no exhaust port in many places. The pump cover is equipped with exhaust valve maintenance window. The clearance between impeller and distribution board is adjusted by gland at both ends of positioning shaft. It is easy to install, use, operate and maintain.

Vacuum Pump For Coal Mine

Liquid Ring Vacuum compressor

Water ring vacuum pump

Emergency treatment of vacuum pump

Emergency treatment of vacuum pump

We all know that any mechanical equipment will inevitably have an emergency when it is used, and vacuum pump is no exception. In this way, operators are required to have good psychological quality and the ability to deal with emergency events. In view of this problem, some emergency treatment methods of vacuum pump are proposed for reference only.

The first point is that when the equipment is in normal operation, it is found that there is a sudden air leak. If the dew point cannot be found immediately, it must be sealed with vacuum sealing mud, and then it can be treated after the work is completed.

The second point is to cut off water and power in case of high temperature. The biggest fear of vacuum equipment is to cut off water and power when it is in high temperature. Therefore, the user needs to have a standby water tank or a tap water pipe when the equipment is installed.

Third, replace the gas cylinder. When the gas cylinder used for the equipment needs to be replaced, remove the pressure stabilizing valve and replace it with a new one. Be sure not to leak during installation.

Fourth, the equipment shall be cleaned and kept clean for a period of time.

Vacuum Pump Installation Method

Liquid Ring Compressor Applications

Factors Affecting The Performance Of Liquid Ring Vacuum Pump

What are the characteristics of water ring vacuum pump

At present, there are many kinds of vacuum pumps, which can meet the requirements of different situations. However, there are still several kinds of vacuum pumps with high practical efficiency. Then, the water cup vacuum pump is one of them. Here, we will know what the practical characteristics of the water ring vacuum pump are.

First, the rotor is an important part of the vacuum pump. For the water ring vacuum pump, the designed rotor has the form of geometric symmetry. The advantage of this design in the use process is that the vibration is relatively small and the operation is relatively stable.

Second, there is a gap between the rotors and between the rotors and the shell, so that in the process of use, there is no need to use lubricating oil, but the friction is also very low. In this way, the driving power is greatly reduced to achieve the purpose of high-speed operation.

Third, the water ring vacuum pump cavity not only does not have the existence of compression, also does not install the use of exhaust valve. In this way, the design structure is simple and compact, so that once there is dust or water vapor in the extracted gas, it will not affect the use.

Finally, there are some other features of water ring vacuum pump, and the existence of each feature enhances the use value of water ring vacuum pump, therefore, such a vacuum pump has been the most possible use.

Water ring vacuum pump

Liquid Ring Vacuum Pump

Roots Vacuum Pump

Composition of complete vacuum system

Composition of complete vacuum system

There are many kinds of vacuum application equipment, but no matter what kind of vacuum application equipment, there is a set of extraction system to remove the gas in the evacuated container, so as to obtain the required vacuum conditions in the vacuum container. For example, a container for vacuum treatment is connected with a vacuum pump by pipes and valves. When the vacuum pump vacuumizes the container, there must be a vacuum measuring device on the container, which constitutes the simplest vacuum pumping system.

For a vacuum system composed of more than two vacuum pumps in series, the low vacuum pump is usually called the front pump (or pre pump) of its upper high vacuum pump, and the highest vacuum pump is called the main pump of the vacuum system, that is, it is the main pump. The limit vacuum degree and working vacuum degree in the pumped container are determined by the main pump. The pipeline from the outlet of the pumped vessel to the inlet of the main pump is called high vacuum pipeline, and the valve at the inlet of the main pump is called the main valve.

Usually, the front pump is also used as a vacuum pump. The pipeline from the pumped container to the pre pumping pump is called the pre vacuum pipeline, and the valve on the pipeline is called the pre vacuum pipeline valve. The pipeline from the outlet of main pump to the inlet of front stage pump is called front stage pipeline, and the valve on the pipeline is called front stage pipeline valve, while the soft connection pipeline is set to isolate the vibration of front stage pump.

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vacuum pump in food industry

vacuum pump in food industry

One of the most common operations in the food industry is to use a vacuum pump system to move liquid or solid from one location or processing step to another. The main parts of pump transportation are pipeline system and vacuum pump. The types of vacuum pumps are very different, and the principles are different. The selection should be based on the characteristics of the materials to be transported. The most commonly used one is gear pump. No matter what kind of vacuum pump, because the rotor rotates in the pump cavity, resulting in the pressure difference, the suction food enters the pump room and constantly extrudes it. Obviously, a closed working chamber must be formed between the gear and the pump chamber of this kind of pump. Although this kind of pump is also used to transfer liquid and slurry, sometimes it can also transport small pieces of materials, but it is possible to crush materials.

Single screw pump may be an ideal equipment for conveying bulk materials with less crushing. This kind of pump is also called propulsion cavity pump. It can form a continuous spiral space between the spiral rotor and the outer wall. When the rotor rotates, it uses the spiral slope to push food into the same size space. Therefore, it will not damage food, such as corn grains, grapes or even shrimp.

No matter which type of vacuum pump is selected, it must be easy to disassemble and thoroughly clean. Nowadays, the common stainless steel sanitary pump can be disassembled with a simple tool in a few minutes, which is very convenient.

The key of pipeline design is to reduce the resistance and dead angle under the premise of ensuring the transportation capacity, to be able to seal and facilitate cleaning.

Liquid Ring Vacuum compressor

Water ring vacuum pump

Liquid Ring Vacuum Pump

Application of condenser in vacuum system

Application of condenser in vacuum system

The main function of the condenser is to condense the steam part of the mixed gas above 100 ℃ from the vacuum tank into the liquid below 25 ℃ at one time, so the cooling capacity should be particularly strong, and the condensation effect should be particularly good. Generally, the condensation power shall be more than 3 / 4 of the rated power (i.e. evaporator power) of VPD equipment.

The structure of the condenser is a shell and tube heat exchanger. There are many baffles in the shell side of the air flow to ensure that the air flow is fully condensed. The total water inlet and outlet pipes are divided into several branches in the condenser to form enough condensation area. Due to the large amount of cooling water, VPD equipment needs to have a special cooling water station or chiller to supply circulating cooling water.

The temperature of cooling water has a great influence on the performance of condenser. The lower the water temperature is, the stronger the water catching capacity is, and the lower the partial pressure of water vapor in the residual gas after condensation is. Generally, the maximum partial pressure of water vapor that the leakage pump can bear is about 3kpa, and the corresponding saturation temperature of water vapor is 24 ℃. That is to say, the temperature of the oil water gas mixture at the outlet of the condenser should not exceed 24 ℃, otherwise, too much water vapor will enter into the leakage pump, affecting its normal work; and the temperature of the cooling water needs to be lower, which is difficult to guarantee in many areas of China in summer. In recent years, in order to effectively enhance the condensation effect, the main condenser of the existing VPD equipment is cooled by a water chiller, or a small condenser with cooling water provided by the water chiller is connected in series between the collection tank and the leakage pump to further reduce the partial pressure of water vapor and kerosene vapor in the residual gas.

The working pressure of the condensing system is also very important. It is obvious that if the total pressure in the condenser and the collecting tank is lower than the saturated vapor pressure of water at that time, the water vapor is impossible to condense at all and will be pumped out by the drain pump. In order to fully condense the water vapor, the condensing pressure must be higher than the saturated vapor pressure. However, the pressure of the condensing system should not be too high. Because the pressure of the condensing system is too high, the gas pressure in the vacuum tank is required to be higher. Otherwise, the mixed gas cannot flow into the condenser naturally under the effect of the pressure difference, and the high pressure in the vacuum tank will directly affect the outward diffusion of water vapor in the insulating material. In consideration of the above two factors and the presence of permanent gas components in the residual gas, the working pressure in the condenser is selected as 4.5kpa, which can not only ensure the sufficient condensation of water swallow gas, but also make the pressure in the vacuum tank as low as possible.

In the VPD equipment, there is also an auxiliary condenser in the condensation system, which is specially used to receive the high-temperature kerosene vapor discharged in the later stage of the kerosene purification process in the distillation chamber. The structure of the auxiliary condenser is the same as that of the main condenser. The power of the condenser corresponds to the power of the distillation chamber, and the condensed kerosene liquid is also discharged to the collection tank.

Liquid Ring Vacuum Pump

Roots Vacuum Pump

Open Cycle Water Ring Vacuum System

diffusion pump working principle

diffusion pump working principle

The structure and principle of the diffusion pump are shown in Figure 1. The bottom is the evaporator, in which the diffusion pump oil is stored. The upper part is the air inlet, the right side pipe is the air outlet, and the mechanical pump provides the pre vacuum at the air outlet during operation. When the oil is heated by the electric furnace, the oil vapor generated is guided along the

The flow tube is ejected downward through the umbrella nozzle. Because there is vacuum (10-2 ~ 10-3 Torr) provided by mechanical pump outside the nozzle, the oil steam flow can be ejected for a long distance and hooked into a jet moving towards the air outlet. When the jet finally touches the wall cooled by cooling water, it will be given a liquid rest and flow back to the evaporator for reuse.

Once the gas molecules entering the pump from the air inlet fall into the steam flow, they will obtain the downward movement and fly down. Because the jet has high speed (about 200m / s), high vapor density (several to dozens of Torr of vapor pressure), and the diffusion pump oil has high molecular weight (350-500), it can effectively take away gas molecules. Therefore, in the jet interface, gas molecules can not stay for a long time, and its concentration is very small. In other words, on both sides of the jet interface, the extracted gas has a large concentration difference. It is this concentration difference that causes the energy source of the extracted gas to continuously cross the interface, diffuse into the jet and be taken to the outlet. There, they are taken away by mechanical pumps.
[url=https://www.evpvacuum.com/how-to-choose-oil-free-vacuum-pump.html]How To Choose Oil Free Vacuum Pump[/url]

How To Choose Oil Free Vacuum Pump

Low Carbon Environmental Vacuum Pump

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Impeller adjustment of vacuum pump

Impeller adjustment of vacuum pump

When it comes to 2BV vacuum pump, I believe that friends who have learned about our website will not be unfamiliar, but do you know the mediation of 2BV vacuum pump impeller? Here is a detailed introduction:

In order to ensure the efficient operation of 2BV vacuum pump, it is necessary to adjust the clearance between the impeller of 2BV vacuum pump and the front guard plate in time. The clearance between the impeller of metal lined pump and the front guard plate is between 0.5-1mm, and the clearance between the impeller of rubber lined pump and the front and rear sheath is equal. When adjusting the impeller clearance of 2BV vacuum pump, first stop the pump, loosen the bolts that compress the bearing assembly, screw the nuts on the adjusting bolts to move the bearing assembly forward, and at the same time rotate the shaft by hand according to the rotation direction of the pump until the impeller of 2BV vacuum pump rubs against the front guard plate.

For the metal lined pump, loosen the nut just tightened at the front by half a turn. Then tighten the nut at the front of the adjusting bolt to move the bearing assembly backward. At this time, the clearance between the impeller and the front guard plate is 0.5-1mm. For the rubber lined pump, screw the nut on the adjusting bolt to move the bearing assembly of the 2BV vacuum pump forward first, so that the impeller contacts the front shield. When the bearing assembly moves backward, so that the impeller contacts the rear shield, measure the movement of the total 2BV vacuum pump of the bearing assembly. The distance is generally taken as the clearance between the impeller and the front and rear sheath. Then adjust the position of the bearing assembly with the adjusting bolt to ensure the correct clearance between the impeller and the front and rear sheath. After adjustment, before starting again, it is necessary to recheck whether the impeller of 2BV vacuum pump rotates normally, whether the compression bolt of bearing assembly is tightened with the adjustment bolt, and then start the 2BV vacuum pump.

CL Sereis Cone Liquid Ring Vacuum Pump

AT/TC Series Cone Two Stage Water Ring Vacuum Pump

2BE Series Compressors

Vacuum coating technology of vacuum pump

Vacuum coating technology of vacuum pump

What do you know about the knowledge of 2BV vacuum pump? You often use it. You should know about its vacuum coating technology. Here is the introduction of the vacuum coating technology of 2BV vacuum pump:

Vacuum coating technology is an important branch of 2BV vacuum pump application technology. It has been widely used in optics, electronics, energy development, physical and chemical instruments, construction machinery, packaging, civil products, appearance science and scientific research. The main methods of vacuum coating are evaporation, sputtering, ion plating, beam stacking and molecular beam epitaxy. In addition, there is chemical vapor deposition.

If the purpose of vacuum coating is to change the physical and chemical properties of the material surface, this technology is an important part of the vacuum surface treatment technology. Now I will give a brief introduction to its main application. First of all, in terms of optics, a piece of optical glass or quartz coated with one or several layers of films of different substances can become a high reflection or no reflection (i.e. antireflection film) or any expected proportion of reflection or transmission data, and can also be used as a filter for absorption of a certain wavelength and transmission of another wavelength.

High reflective films are needed from large-diameter astronomical telescopes and various lasers to large window coated Jasmine in new buildings. Antireflective film is widely used in photography, laser start, and new building window coated glass, which are in great demand. Antireflection film is widely used in camera and television camera lens. Vacuum coating plays an important role in electronics. Various range of inheritance circuits. Including memory, arithmetic unit, notification logic element, etc. all need to use conductive film, insulating film and maintenance film. As the mask of the circuit, chromium film is used.

ZJ Roots Vacuum Pump

ZJP Roots Vacuum Pump

air-cooled roots-liquid ring vacuum system

Wear factors of SK vacuum pump

Wear factors of SK vacuum pump

Sk vacuum pump in a long time of high-speed operation, it is inevitable that there will be wear. If the wear is serious, the efficiency of vacuum pump will be affected. Therefore, we should pay attention to avoid the occurrence of wear factors as much as possible in the process of using the equipment. Let's analyze the wear factors for you.

The wear of the journal surface of SK vacuum pump is uneven. The radial wear of the main journal and the connecting rod journal is mainly elliptical, which corresponds to the wear part, that is, the wear part of each main journal is close to the side of the connecting rod journal, and the wear part of the connecting rod journal is also close to the side of the main journal. The crankshaft journal has conical wear along the axial direction. The elliptical wear of the journal is caused by the uneven distribution of the force acting on the journal in the circumferential direction

When the engine is working, the comprehensive force on the connecting rod journal always acts on the inner side of the connecting rod journal, and the direction is outward along the crankshaft radius, resulting in the large wear on the inner side of the connecting rod journal, forming an ellipse. The reason for the tapered wear of the connecting rod journal is that the oil passage leading to the connecting rod journal is inclined. When SK vacuum pump rotates, under the action of centrifugal force, the mechanical impurities in the lubricating oil accumulate on one side of the connecting rod journal, which accelerates the wear of the journal and makes the wear of the connecting rod journal tapered.

In addition, the bending of the connecting rod, the non perpendicularity of the cylinder center line and the SK vacuum pump center line and other reasons will make the axial force on the journal uneven, and cause the wear deflection. The wear of the main journal is elliptical, mainly due to the influence of the centrifugal force of the connecting rod, the connecting rod journal and the crank arm, so that the relative wear between the side near the connecting rod journal and the bearing is greater. In addition, the journal surface may be scratched and burned. Scuffing is mainly caused by unclean engine oil, in which large hard mechanical impurities are scratched on the journal surface. The burn of the journal surface is caused by the burning of the bearing. The burning of the bearing is mainly caused by insufficient lubrication, too thin oil, blocked oil circuit and other reasons.

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Dry Explosion Proof Vacuum Pump

Semiconductor Vacuum Pump

Oil And Gas Recovery Vacuum Pump

Inlet pipe of vacuum pump

Inlet pipe of vacuum pump

Generally, in the process of vacuum pump installation, many people change the inlet diameter of the equipment at will for the convenience of installation. The consequence is that it is easy to cause great use impact in the later production.

We'd better not change the size of each part of the vacuum pump at will. It's manufactured and installed at will after the designer's research in production. It will have a bad impact on the vacuum pump in the future use.

If the inlet size is reduced, the flow rate of the pump will increase, and the flow loss will increase accordingly. In addition, there may be serious cavitation problems caused by eddy current. When the rotating speed is high, it will cause vibration of the pipeline and aggravate the progress of cavitation. Because of the existence of vibration, the operation of the vacuum pump will be unbalanced and easy to cause leakage. Therefore, when piping, we should configure the corresponding pipes according to the factory standard of the manufacturer to avoid unnecessary troubles.

Therefore, when installing the vacuum pump, we must install it in accordance with the operating instructions. We can't change it at will, which will cause inconvenience in later use and safety in production.

Vacuum Pump In Oil And Gas Recovery

Oilless Vacuum Pumps

Liquid Ring Vacuum compressor

How to mark the vacuum degree of water ring vacuum unit

How to mark the vacuum degree of water ring vacuum unit

The vacuum degree value in water ring vacuum unit refers to the value that the actual pressure value in the negative pressure station is lower than the atmospheric pressure, which is usually marked by the following two methods:

1. Mark with "absolute pressure" and "absolute vacuum degree": in the actual situation, the absolute pressure value of water ring vacuum unit is between 0 and 101.325kpa, which needs to be measured by absolute pressure instrument. In the place of 20 ℃ and zero altitude, the initial value of the instrument used to measure the vacuum degree is 101.325kpa.

2. Use "relative pressure" and "relative vacuum degree" to identify: "relative vacuum degree" refers to the difference between the pressure of the tested object and the atmospheric pressure of the measurement site. Use a common vacuum meter to measure. Under normal pressure, the initial value of the meter is 0. When measuring vacuum, its value is between 0 and - 101.325kpa.

Water ring vacuum unit can not only save water source, but also reduce environmental pollution. It is flexible and convenient to install. It is widely used in occasions where vacuum source is frequently used and the required air volume is not too large.

Water ring vacuum pump

Open Cycle Water Ring Vacuum System

Closed Cycle Water Ring Vacuum System

vacuum pump of working principle

vacuum pump of working principle

You must be familiar with the vacuum pump, but you may not know its working principle. Let's introduce it to you and have a look.

1. During the operation of the vacuum pump, due to the centrifugal force, water forms a closed ring of approximately equal thickness, which is determined by the shape of the pump cavity. The inner surface of the upper part is just tangent to the impeller hub, and the inner surface of the lower part is just in contact with the top of the blade (in fact, the blade has a certain insertion depth in the water ring).

2. A crescent shaped space is formed between the impeller hub and the water ring, and this space is divided into several small cavities with equal number of blades by the impeller. If the upper 0 ° of the impeller is taken as the starting point, the volume of the small cavity will increase from small to large when the impeller is 180 ° before rotation, and it is connected with the suction port on the end face. At this time, the gas will be sucked in. When the suction is finished, the small cavity will be isolated from the suction port. When the impeller continues to rotate, the small cavity will decrease from large to small, so that the gas will be compressed. When the small cavity is connected with the exhaust port, the gas will be discharged from the stainless steel vacuum pump. Outside the pump.

Vacuum pump has its unique advantages and advantages. It has been widely used in food vacuum packaging, medicine, printing machinery paper transportation, glass industry transportation, vacuum fixture, drying and other units.

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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 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.

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 of pump flow passage parts is the place where bubbles disappear.

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