Overall arrangement structure and installation of vacuum pump

Now the field of vacuum pump is becoming more and more extensive, so now there are more kinds of products. Now with the continuous development of vacuum technology and the requirements of scientific research field for its pressure are becoming wider and wider. Basically, the vacuum pumping system composed of several vacuum pumps can meet the production after common pumping. 

At present, the departments concerned are quite familiar with the working pressure range of the vacuum pump, so any type of vacuum pump will not be fully applicable to all working ranges, and different types of vacuum pumps can only be selected according to different working requirements and pressure ranges.

In order to be more convenient to use, vacuum pumps with different performance will be combined according to their different requirements in the process of vacuum technology. The use of products is an essential main pump in the application of vacuum technology in various industries of our national economy.

The overall layout structure of the vacuum pump will directly determine the overall structure of the pump. The vertical structure, the horizontal device of the air inlet and exhaust port and the connected pipeline are more convenient, but the center of gravity of the pump is relatively high when it is used, so its stability performance will be poor when it is running at high speed.

When the horizontal pump is installed, its exhaust port needs to be below, while the air inlet needs to be above. Sometimes, in the process of installation, for the convenience of system pipeline installation and connection, the exhaust port can be connected from the horizontal direction, and the direction of air inlet and exhaust is perpendicular to each other.

CL Sereis Cone Liquid Ring Vacuum Pump

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Roots Vacuum Pump 

Dry screw vacuum pump for yarn steamer

The main purpose of the steaming machine is to combine the continuous silk thread with weaving conditions and stop the setting after twisting, that is to stabilize the twist under a certain pressure and temperature, and obtain balanced and non twisting silk thread. The operation process of yarn steaming machine is vacuum preheating humidification heat preservation constant temperature vacuum cooling ending. The dry screw vacuum pump for vacuum pumping is generally water ring type dry screw vacuum pump. The working pressure of the steaming machine is – 0.085-0.1mpa. The water ring type dry screw vacuum pump can extract a certain amount of condensable gas. 

The yarn steaming machine with dry screw vacuum pump can stop the uniform, accurate and mild steam treatment of yarn or fabric from low temperature to high temperature. The steam process is controlled by microcomputer, and the temperature is controlled to ± 0.5 ℃. It can ensure that the yarn steaming process can be reproduced accurately according to the budget process, avoid the generation of condensate water to the maximum extent, and make the yarn get uniform and mild steam treatment.

Therefore, it can be used in this process. How large the water ring type dry screw vacuum pump is used, the suitable dry screw vacuum pump can be selected according to the size of the yarn steaming machine and its own time request.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Vacuum pump market and its application fields

 Vacuum pump is a kind of equipment which can produce, improve and vacuum in a certain closed space. Vacuum pump can be defined as: chemical or physical-chemical method to be pumped out of the container to obtain vacuum equipment or equipment. With the development of vacuum application, many kinds of vacuum pumps have been developed, and their pumping speed has increased from 0.0 to hundreds of thousands and millions of liters per second. According to the working principle of vacuum pump, vacuum pump can be divided into two types: gas transfer pump and gas trap pump. 

With the increasing demand for the pressure scale in the field of vacuum application technology and scientific research, most of them need to be pumped by several vacuum pump vacuum pumping systems before they can meet the demand of research process. Because the operation scale of vacuum application is very wide, so the vacuum pump can't completely operate the pressure scale, so it can only be used according to different operation requirements Empty pump.

In order to use conveniently and meet the needs of various vacuum technology processes, water ring vacuum pump sometimes combines various vacuum pumps according to their functional requirements and is used in unit type. The working principle of vacuum pump is also called water ring vacuum pump. Water ring pump began to be used as self suction pump, and then gradually used in oil, medicine and food and many other industrial parts. In many technical processes of industrial production, such as vacuum filtration, vacuum water diversion, vacuum feeding, vacuum evaporation, vacuum concentration, vacuum moisture regain and vacuum degassing, water ring pump has been widely used.

CL Sereis Cone Liquid Ring Vacuum Pump

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Roots Vacuum Pump

Precautions for 2x rotary vane vacuum pump

(1) The vacuum degree refers to the pressure of the remaining gas in the pumped vessel. The partial pressure is the factory standard, and the total pressure is the auxiliary standard. The thermocouple measures the total pressure of all kinds of steam and permanent gas, while the Maxwell's meter can only measure the partial pressure of the permanent gas, so the values of the two meters are different.

(2) The pumping speed is calculated according to the geometric dimensions. At atmospheric pressure J, the actual pumping speed is basically consistent with the geometric pumping speed. At various pressures, the pumping speed decreases to a certain extent. The relationship between pumping speed and pressure is shown in Fig. 4.

(3) Temperature rise refers to the temperature difference between the oil at the exhaust valve and the room temperature after the pump temperature is stable.

(4) 2X rotary vane vacuum pump model: column 2k-1, 2 represents double-stage pump, K represents rotary vane vacuum pump, and the number behind a horizontal line represents pumping speed per second.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Causes of inner wall wear of rotary vane vacuum pump

Any kind of mechanical products will wear after working for a long time. Let's discuss the causes of wear and how to reduce the wear. 

Rotary vane vacuum pump uses vacuum oil as sealing medium. Besides sealing, oil also lubricates. The deterioration of oil results in performance degradation, which easily aggravates the wear of pump wall. If the extracted gas contains water vapor, which enters into the pump cavity, the vacuum oil will be emulsified and the performance of the oil will be reduced. There is also a case that the exhaust volume is large, and it is easy to wear the inner wall. How to understand? Vacuum pump is the equipment to obtain vacuum. If the vacuum can not be obtained for a long time, the load of the pump will be large and it is easy to wear.

The phenomenon of inner wall wear is common in chemical industry. How to solve it? We can choose other more suitable models to replace, which not only ensures your benefits, but also saves you costs.

Vacuum Pump Or Compressor

Water ring vacuum pump

Rotary Vane Vacuum Pump

Technical knowledge of water ring vacuum pump

 First of all, we should understand the working range of vacuum pump and water ring, but we should pay more attention to the application of water ring and water ring? 

Water ring vacuum pump can also be simply called water ring pump. It is a kind of rotary variable volume vacuum pump which can change the volume. It is mainly composed of impeller, pump body, suction and exhaust disc, suction port, exhaust port, auxiliary exhaust valve and other parts. When working, it mainly rotates at high speed through the eccentric rotor with fixed blades inside, throwing the medium into the pump body through the suction process to the stator The liquid ring, which is concentric with the stator, is formed by external force. The liquid ring and the high-speed rotating fixed blade constitute a kind of variable volume vacuum pump with variable volume.

The working principle of water ring vacuum pump is to fill the pump first, that is to avoid the rotor idling and inject appropriate amount of water. When the pump starts according to the start-up procedure, with the high-speed rotation of the fixed blade, the filled water also runs at high speed due to external force, resulting in centrifugal effect, and forms a water ring in the outer ring of the fixed blade. When the fixed blade is rotated to be connected with the suction port and the exhaust port, the suction process and exhaust process are carried out respectively. During the suction process, the volume of the small chamber gradually increases from small to large. During the exhaust process, due to the continuous rotation of the impeller, the gas is compressed, and the gas is discharged when connected with the exhaust port.

CL Sereis Cone Liquid Ring Vacuum Pump

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Roots Vacuum Pump 

Oil vacuum pump system

From the perspective of energy saving and emission reduction, it is a problem that every vacuum operator must face up to. The traditional concept of oil-free is only to obtain a clean, carbon free hydride pollution-free vacuum environment. Today's "oil-free" not only meets the requirements of clean vacuum environment, but also protects the environment to prevent the pollution and emission of waste oil and waste gas.

The traditional oil vacuum system (2x type rotary vane vacuum pump) generally has low energy utilization rate, especially the oil booster pump and oil diffusion pump. It is under this background that the molecular pump is widely used and has the potential to replace the traditional diffusion pump in the area less than 400 mm. The power of the diffusion pump is five times higher than that of the molecular pump with the same diameter of 250mm. In the long run, the market space of oil vacuum system is bound to be narrower and narrower.

Function Of Various Vacuum Pumps In Vacuum System

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Power supply configuration of claw vacuum pump

Claw type vacuum pump, claw type air pump, claw type water pump, etc., after connecting the power supply, the power supply voltage should be stable under any load and working condition. With switching power supply is a better solution. If the power supply is not regulated, the voltage may be very high when the pump is not connected. Once the pump is connected, the power supply voltage will drop sharply. Even if the voltage after connecting the pump is equal to the rated working voltage. At this time, the power supply voltage will fluctuate abnormally, leading to the pump's work will be completely disordered. 

It is also not advisable to divide and depressurize by resistance, because the working current of pump will change when the load of gas (water) circuit changes, which will lead to the change of resistance voltage. Therefore, the power supply must have voltage stabilizing function. In actual purchase, with and without voltage stabilizing function, the price difference is very small, it is recommended to buy with voltage stabilizing function.

The output current that the power supply can provide must be larger than the working current of the pump, so as to ensure the energy demand of the pump. And choose power supply, must not choose the price is too cheap switching power supply. In order to attract customers to buy this kind of power supply, the parameters usually have false mark and false report.

Vacuum Impregnation Technology

Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Component structure of oil free vacuum system

In recent years, it has been found that the performance and technical index of many electronic devices are seriously affected by the return of oil vapor from mechanical vacuum pump and diffusion pump into the evacuated vessel or device. For example, the oxide cathode of electronic tube reduces its emission performance and service life due to oil vapor; various high-power and high-voltage electronic tubes are easy to be broken through due to the presence of oil vapor; the high-voltage vacuum capacitors used in radio stations, due to the presence of poised steam, significantly reduce their withstand voltage index, and oil vapor has a significant adverse effect in many places. Therefore, the vacuum system used in these aspects should be replaced by an oil-free vacuum system, that is, instead of using vacuum oil sealing and vacuum oil as the working fluid (such as mechanical pump and diffusion pump), the vacuum system can be obtained by adsorption of gas molecules and reducing the pressure in the container. 

The adsorption pump uses the porous surface of some solid materials to strongly adsorb the gas in the cold state, so that the closed system can obtain a low vacuum of 10-2 mm mercury column. It is used as the front stage of oil-free system.

In addition to activated carbon, most of the adsorbents used in the adsorption pump use molecular sieve (artificial zeolite) to adsorb gas and obtain vacuum. Because, after cooling with liquid nitrogen, each kilogram of molecular sieve can pump a 50-100 liter container from the atmosphere into a vacuum of 10-2 mm mercury column. Therefore, it is a pump with large suction. After baking at about 400 ℃, the gas it absorbs will be released again (called activation or regeneration) to restore the ability of reabsorbing. At present, the commonly used 5A molecular sieves (with large absorption capacity, suitable for exhaust air, but often "activated", with an average pore diameter of about 5 angstroms) and 13X molecular sieves (although their adsorption capacity is smaller than 5A molecular sieves, they can absorb oil vapor molecules).

Rotary Vane Vacuum Pump In Viscose Fiber Production

Pump Shaft Damage Causes

Vacuum System In Straight Pull Single Crystal Furnace

horizontal centrifugal pump application

1. Pipeline centrifugal vacuum pump is used to transport clean water and other liquids similar to clean water in physical and chemical properties. It is suitable for industrial and urban water supply and drainage, high-rise building pressure water supply, garden irrigation, pressure fire protection and supporting equipment. 

2. Hot water circulating pump (high temperature) is widely used in energy, metallurgy, chemical industry, textile, paper, hotel and other boilers. The service temperature of iswr is less than or equal to 120 ℃ and the service temperature of WRG is less than or equal to 240 ℃.

3. Horizontal chemical pump is used for conveying liquid with no solid particles, corrosive and viscosity similar to water. It is suitable for petroleum, chemical industry, metallurgy, electric power, papermaking, food, pharmaceutical and synthetic fiber industries. The operating temperature is t: - 20 ℃ to 120 ℃.

4. Horizontal oil pump is used to transport gasoline, diesel oil, kerosene and other petroleum products. The operating temperature is t: 20 ℃ to 120 ℃.

Vacuum Valve Pressure Test Method

Roots Blower In Sewage Treatment Station

High Pressure Water Cooled Roots Blower

How to optimize the selection of dry screw vacuum pump

Different types of dry vacuum pump, we are constantly looking forward to reducing its physical size. However, this is in contradiction with the pumping speed of the vacuum pump, which is proportional to the volume of the vacuum pump. Small physical size means low volume. Of course, another important factor affecting the pumping speed of vacuum pump is speed. In order to make the suction speed of small vacuum pump different from that of large vacuum pump, it is necessary to improve the speed. There are two ways to change the speed of vacuum pump, one is to change the frequency of power supply, even with frequency converter; the other is to change the proportion of gearbox. Among them, the advantage of using frequency converter is that it can provide a closed-loop control, but it is easy to cause torque loss under heavy load. Changing the gear ratio of the gearbox is a very economical way, of course, it can only provide a single speed, can not be controlled. 

Today, you can see that there are so many different designs for dry vacuum pumps, each with its own characteristics and advantages and disadvantages. In history, the use of capital has been an important factor influencing people's choice of vacuum pump. More and more vacuum pump users realize that the stability of vacuum pump should also be considered. Due to the wrong solution of the vacuum pump, the efficiency of the machine is reduced, which affects the consumption and delivery of the wafer, resulting in the formation of wafer scrap and processing damage of other parts. As the screw design adopts a single-stage design, the number of parts used can be reduced by up to 60% compared with multi-stage pumps (such as ball gap, claw and combination). This is a big advantage for stability and future maintenance costs.

In general, if the user thinks the power consumption is the most important for him, then choosing an internal compression screw may be a good choice, and the nitrogen content is the least important for him. However, in general, the requirements for tail gas disposal are more and more severe, so it is particularly important to reduce the amount of nitrogen used in the future. If you want to dispose of a variety of semiconductor processes without changing them with a simple inventory control pump, external compression screws are the best choice.

Rotary Screw Vacuum Pump Performance And Structural Characteristics

Vacuum Pump In Farm Vehicle Power System

Vacuum Unit Equipment In Light Oil Metallurgic Requirements

Influence of noise on rotary vane vacuum pump

According to the experiment, the closer the exhaust port is to the upper tangent point, the lower the noise is. But it is too close to the function of the rotary vane pump. 

In production, it is found that the exhaust port is small, the noise is small, and vice versa. This shows that the size of the exhaust port has a great impact on the noise. Nanguang machine factory has a unique research in this field.

When starting at atmospheric pressure, the pressure is high and the amount of gas is large. High and low vacuum chambers are selected to exhaust together, and most of the gas is discharged from the exhaust valve of the high vacuum chamber. Because the size of the exhaust port of the high vacuum chamber has no effect on the noise, and can reduce the exhaust pressure, the tightening work and the starting power, the area of the exhaust port of the high vacuum chamber should be larger. In normal operation, the exhaust valve of high vacuum chamber is closed, and the primary factor affecting noise is exhaust valve of low vacuum chamber. Therefore, the exhaust port area of the low vacuum chamber should be smaller to reduce the noise, but if the exhaust port is too small, the exhaust pressure will increase and the power consumption will increase.

CL Sereis Cone Liquid Ring Vacuum Pump

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Roots Vacuum Pump

Troubleshooting of rotary vane vacuum pump

If the rotary vane vacuum pump is not operated properly, it will often present some defects, such as vacuum drop, oil injection, smoke, oil leakage at oil seal, noise, and emulsification of vacuum pump oil in the pump. In case of such a situation, first of all, there is no need to panic. After the shutdown, clean up one by one according to the shortcomings. Here are some ways to eliminate shortcomings. 

Rotary vane vacuum pump smoke and fuel injection: refers to rotary vane vacuum pump in operation, exhaust port smoke or fuel injection. The assumption is that the pump has just started to run, there is smoke phenomenon, belongs to normal, if the long time in smoke is abnormal. The way to deal with it: smoke indicates that the air inlet of the pump, including pipes, valves and containers, has been repaired. After leak detection, the smoke will end.

Vortex flowmeter fuel injection, indicating that there are a lot of leakage points outside the intake port, so that the air inlet is exposed to the atmosphere. Treatment: seal the air inlet of the pump to make the pump run. If there is no oil injection, it indicates that there is leakage; if the exhaust valve plate is damaged, check whether the exhaust valve plate can be damaged and replace the damaged exhaust valve plate. Rotary vane vacuum pump noise: here refers to the noise of the pump.

Knock the cylinder, pump operation when issued irregular sound, like metal knock metal sound. This is the sound of the rotating plate hitting the pump body. This situation is mainly caused by the spring break or contraction or pop-up failure between the pairs of rotating blades. Solution: turn on the pump to check whether the spring can be damaged. Replace the spring. Exhaust valve noise, mainly due to pump exhaust valve plate damage. Disposal way: change the good exhaust valve piece.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces 

Principle of pumping liquid by water ring pump

When pumping liquid, the process of suction is the same as that of gas. Because the speed of the sickle increases on the left side of the pump. 

According to Bernoulli's equation, when the speed increases, the pressure will decrease. When the liquid continues to move forward and flows to connect with the pressure outlet, the pressure will suddenly increase. The result of pressure increase makes the liquid passing through the pressure outlet be restrained and slow down. The sudden increase of pressure and deceleration will bring huge hydraulic loss. Therefore, the power of water ring pump in pumping liquid is very low (compared with pumping air) The power should not exceed 15 ~ 20%, because of the huge hydraulic loss and the "water conveyor effect" (when the liquid flows to the pressure outlet area, the liquid flows from the place with large radius to the place with small radius, and the liquid transfers its own energy to the impeller, just like the water conveyor), the lift is much smaller in practice. The head of water ring pump is smaller than that of centrifugal pump of the same scale.

Vacuum System Of Heat Exchange Unit

Vacuum Pump In Vacuum Extruder System

Liquid Ring Vacuum Pump In Beekeeping Tools 

Requirements of vacuum pump for smooth oil

In fact, the factors that affect the vacuum degree of vacuum pump are various, including sealing method, spare parts space, quality of materials, etc. This paper mainly explains the requirements of vacuum pump for smooth oil, because the quality of oil will also affect the vacuum degree of vacuum pump. 

(1) With appropriate viscosity: the viscosity of oil is too small, the smoothness is not satisfactory, the sealing performance is also poor, the viscosity is too high, the internal conflict is large, the rotor rolling is difficult, the kinetic energy consumption is increased, and the oil temperature is also increased. The increase of oil temperature will accelerate the oxidative degradation of oil, especially for rotary vane vacuum pump.

(2) Low full vapor pressure: the target of "vapor pressure" of oil is low, so it is not easy to transpiration under the working conditions of low pressure and high temperature in vacuum pump, so as to ensure the required vacuum degree.

(3) The oxidation stability is good, and it is not easy to oxidize and degenerate.

Generally, vacuum pump oil is selected for vacuum pump. At present, domestic vacuum pump oil only needs No.1, which is refined from natural crude oil. It has smooth and sealing effect in vacuum pump

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Reasonable selection of vacuum pump according to metallurgical gas quantity

The air source of vacuum metallurgical equipment in cold furnace pre pumping and hot state exercise is: 1) the atmosphere in the extracted space (related to the volume to be pumped); 2) the gas released during the process (including the generated and imported gas, which is related to the time, temperature, pressure and production process); 3) the surface gas released in the vacuum (related to the type of data, surface product, time, temperature and pressure, etc.) (4) gas leakage and infiltration (related to leakage rate of system components, welding quality of dynamic and static sealing components of equipment and structural materials), and (5) transpiration gas caused by data vapor pressure (related to temperature and pressure). 

In order to ensure the demand of metallurgical process, the planning of vacuum system is to select appropriate vacuum components such as pumps and valves according to the above-mentioned gas flow, and put forward reasonable placement scheme according to the process of gas extraction, so as to achieve the goal of removing the gas in the space to be evacuated, overcome the outgassing and leakage, and make the vacuum chamber always adhere to the required vacuum degree.

Roots Blower For Unloader

Roots Blower Used In Return Material Process

Roots Blower Of Lubricating Oil Selection 

Application and applicable temperature of high temperature pump

The flow passage parts of high temperature pump are made of stainless steel (304, 316L), which are widely used in petroleum, chemical, pharmaceutical, electroplating, environmental protection, water treatment, national defense and other departments. It is an ideal equipment for conveying flammable, explosive, toxic and precious liquids, and the best choice for creating a leak-free and pollution-free culture workshop. 

The normal applicable temperature of the high-temperature pump is less than 100 degrees. If high-temperature medium needs to be transported, it can be customized as high-temperature type, and the applicable temperature can be within 200 degrees. It can also be customized with insulation jacket to keep the high-temperature medium transported.

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Requirements of vacuum pump for lubricating oil

In fact, the factors that affect the vacuum degree of vacuum pump are various, including sealing mode, clearance of accessories, material quality and so on. This paper mainly explains the requirements of vacuum pump for lubricating oil. 

(1) With appropriate viscosity: the viscosity of oil is too small, the lubricity can not meet the requirements, the sealing is not good, the viscosity is too high, the internal friction is large, the rotor rotation is difficult, the kinetic energy consumption is increased, and the oil temperature is also increased. The increase of oil temperature will accelerate the oxidation deterioration of oil, especially for rotary vane vacuum pump.

(2) Low saturated vapor pressure: the "vapor pressure" index of oil is low, so it is not easy to evaporate under the working conditions of low pressure and high temperature in the vacuum pump, so as to ensure the required vacuum degree.

(3) The oxidation stability is good, and the oil in use is not easy to oxidize and deteriorate.

Generally, vacuum pump oil is selected for vacuum pump. At present, there is only No. 1 vacuum pump oil made in China. It is made of natural crude oil and refined deeply. It plays the role of lubrication and sealing in vacuum pump.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

Oil diffusion pump vacuum system pollution and Prevention

The vacuum system of oil diffusion pump is the most commonly used vacuum system, and the vacuum degree range is 1.3 × 10-3 ~ 1.3 × 10-5 PA. All kinds of vacuum formed by vacuum system of oil diffusion pump

After long-term operation, the common defect of the device is that the vacuum degree cannot be pumped up or the vacuum degree cannot reach the original limit vacuum level. Oil vapor pollution and vacuum technology 

The pollution of various pollutants in the process is related to

(1) Clean the vacuum chamber regularly;

(2) Stop cleaning oil seal mechanical vacuum pump and oil metal diffusion pump regularly

Water Ring Vacuum Pump

Dry Scroll Vacuum Pump

industrial vacuum pumps,vacuum furnaces

Vacuum penetration technology of vacuum pump

Vacuum impregnation in food industry refers to the process that food is directly placed in the impregnation solution of container. Under vacuum and normal temperature, through long-time immersion, the impregnation liquid can slowly penetrate into the food and complete the process of taste. It is often used in the processing of fungus food. Compared with room temperature impregnation, it has a shorter time and more delicious effect. 

Most of the vacuum impregnation equipment in the prior art includes the impregnation tank, the air exhausting device, the feeding device and the discharging device. After the materials are placed in the impregnation cage, they are placed in the impregnation tank as a whole. After vacuumizing, the impregnating material is discharged and the impregnation cage is put forward. 

In the long-term working process, the staff found that the existing technology has the problem of uneven taste of materials. For food, there are often dead points where the raw materials are stacked, which are difficult to be touched by the impregnating materials. At these dead points, the finished products will not taste good.

In order to solve the problem that the finished product in the prior art can not taste evenly and the quality control is poor. A kind of vacuum impregnation equipment is put forward based on the practical model.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump