Mechanical seal screw vacuum pump with external cooling device

 The utility model discloses a mechanical seal screw vacuum pump with an external cooling device, which comprises two screw rotors and an input shaft driving the two screw rotors to rotate. The two ends of the screw rotor are provided with a mechanical seal, the extension of the input shaft and the atmospheric side are provided with a mechanical seal; the mechanical seal part is provided with a cooling cavity; the screw vacuum pump is provided with a device for taking away the heat of the mechanical seal The external cooling circulating device is a circulating circuit composed of oil tank, oil pump and oil separator. 

Compared with the prior art, the vacuum pump of the utility model adopts mechanical seal and forced circulation cooling, which completely blocks the leakage between the front of the pump and the cooling chamber as well as between the cooling chamber and the atmosphere; the external circulation cooling device forces the mechanical seal to cool down, with low working temperature and sufficient lubrication, which increases the service life and reliability of the overall transmission parts, and has the advantages of low energy consumption, good cooling effect and safe operation It is fully reliable.

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Rotary Vane Vacuum Pump

Dry Scroll Vacuum Pump

Talk about vacuum pump

Water ring vacuum pump (water ring pump) is a kind of coarse vacuum pump. The limit pressure it can obtain is 2.66-9.31kpa for single-stage pump and 0.133-0.665kpa for double-stage pump. Water ring pump can also be used as compressor, it belongs to low pressure compressor, its pressure range is (1 ~ 2) x105pa gauge pressure (under specific conditions). Water ring pump is widely used in many processes of petroleum, chemical, machinery, mining, light industry, papermaking, power, metallurgy, medicine, food and other industries, municipal and agricultural sectors, such as vacuum filtration, vacuum feeding, vacuum degassing, vacuum evaporation, vacuum concentration and vacuum moisture regain, etc Flammable, explosive gas, in addition to dust, water gas can be pumped, therefore, the application of water ring pump is increasing. 

Water ring pump is composed of impeller, pump body, suction and exhaust disc, water ring formed by water in the inner wall of pump body, suction port, exhaust port, auxiliary exhaust valve, etc.

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water ring vacuum pump selection standard

What is the selection standard of water ring vacuum pump? Many people are very confused, today for you to briefly introduce its selection criteria, I hope to help you. 

1. When the unit works, the vacuum degree is stable, the power consumption is small, and the motor power does not exceed 4kw.

2. The vacuum parameter design is reasonable, the vacuum degree and pumping speed can meet the production requirements. The new vacuum pump with low vacuum and large suction should be selected. The maximum vacuum degree of the pump should not be greater than 90%, and the maximum pumping speed should be greater than 25i / s.

3. High quality water ring vacuum pump has good cooling cycle and sealing device.

4. It is equipped with automatic dewater meter.

5. It has the advantages of flexible movement, easy maintenance and long service life.

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How to maintain the return oil of diffusion vacuum pump

What about the oil return from diffusion pump? If the vacuum gauge is not damaged, the oil return is generally not needed to be repaired. The main purpose is to clean the oil of diffusion pump in vacuum chamber. It's better to use gasoline to wipe the vacuum chamber wall all over again, and then wipe it with alcohol again. Oil must be clean is the most important, if there is oil in the room, there will be white film plating, film quality is very poor and other phenomena, not because of the damage of electroplating equipment, but because of oil in the vacuum chamber. 

1. The cooling water is blocked or the water pressure is not enough, which leads to the decrease of cooling capacity, the upper part of diffusion pump becomes hot, and the oil vapor cannot be liquefied well. The solution is to connect the inlet pipe of diffusion pump with 4MPa air source to blow out the scale, and connect the outlet pipe with 4MPa air source. If the scale is large and firm, dilute hydrochloric acid can be added. Or replace the diffusion pump.

2. The heating temperature is too high, because the power of the diffusion pump heater is not consistent with the rated power, too high, resulting in a large amount of steam, which can cause oil return. The problem can be solved by replacing the electric furnace wire.

3. If the oil filling quantity is too high, the steam circulation will be slow and the steam will be trapped when it is compressed to the lower level, which will cause oil return. The control of oil filling amount according to the information provided by the manufacturer can be avoided.

4. Oil oxidation, diffusion pump oil oxidation, viscosity and steam flow are affected, can not reach the injection speed, naturally returned to the vacuum chamber. It can be said that the diffusion pump is removed, the pump core is taken out, cleaned with 120 ° gasoline, then polished, the carbon deposit and black oxide layer are polished off, then cleaned and dried with 120 ° gasoline again, and then installed, the diffusion pump oil or silicone oil is poured in, and the work can be started after heating several times. Prevent contamination of workpiece.

5. If the working time of diffusion pump is more than 8-10 years, or in harsh environment, replacement can be considered. Improve work efficiency and maintenance cost.

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Adjustment method of axial clearance of vacuum pump unit

Together to explore the vacuum pump unit axial clearance adjustment method, I hope to help you.

1. The axial clearance of the impeller is kept at about 2-4mm by pre adjustment to prevent the shaft from extending due to the axial force of the vacuum pump unit and the screw tightening, resulting in the friction between the impeller and the guide vane surface.

Pre adjustment method: after the deep well water pump is installed, remove the motor cover, turn the adjusting nut with a wrench, and rotate the coupling anticlockwise by hand. When the coupling and transmission shaft can rotate freely, it means that the rotating part of the water pump has been lifted by the adjusting nut, and the impeller has a gap. Use a wrench to rotate the adjusting nut (press the coupling by hand), and lower the transmission shaft. When the impeller clearance disappears, the impeller and the guide vane rub, and the coupling cannot be turned by hand. When the transmission shaft is hoisted again to make the axial clearance reach 2-4mm, the position of the adjusting nut is fixed to complete the pre adjustment.

2. After 16-20h operation, the size of each part has reached a stable state, and the final adjustment can be carried out. The adjustment method of final regulation is the same as that of pre adjustment.

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Composition of medical negative pressure system

Medical negative pressure suction system is composed of user pipe network and vacuum suction station. The user pipe network includes combination terminal and hanging tower; the vacuum suction station includes electric control cabinet, water ring vacuum pump, medical vacuum tank, sterilization filter, gas-liquid separator, sewage collection tank, etc. By vacuumizing the vacuum tank, the vacuum tank can maintain a certain negative pressure, and continuously provide suction to the user pipe network to meet the needs of users. 

The working process of medical negative pressure system: gas end point → sewage collection tank → vacuum tank → sterilizer → vacuum pump → gas water separator → waste gas evacuation, sewage liquid is collected in a centralized way and sent to sewage treatment station.

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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 ℃.

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Roots Blower In Sewage Treatment Station

High Pressure Water Cooled Roots Blower

Exhaust pressure of Roots vacuum pump

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

The exhaust pressure has a great influence on the suction capacity and shaft power consumption of Roots vacuum pump. When roots vacuum pump system is running, if the exhaust pressure is higher, the suction capacity of Roots vacuum pump will be smaller, and the power consumption of corresponding shaft will be greater. On the contrary, when the exhaust pressure of the system is smaller, the suction capacity of Roots vacuum pump will be greater, and the power consumption of corresponding shaft will be smaller.

Therefore, in the actual operation and maintenance process, the exhaust pressure data of Roots vacuum pump system should be observed in real time. When the abnormal exhaust pressure data appears, corresponding measures should be taken immediately to update the whole vacuum system, so as to maintain the exhaust pressure of the vacuum system within the standard range for a long time, and ensure that roots vacuum pump is always in excellent working conditions, and effectively improve the performance of the system High mechanical efficiency of Roots vacuum pump.

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Vacuum solenoid valve

The vacuum valve controlled by magnetic force is called vacuum solenoid valve. The sealing mechanism of electromagnetic vacuum valve is the same as that of baffle valve, as shown in Figure 1. Normally, the valve cover of the solenoid valve is compressed by the spring to seal the pipeline channel. When the solenoid valve is required to open, the current is connected to the solenoid coil, which generates magnetic force to absorb the armature, and drives the valve cover to open the valve. 

The solenoid valve can also be designed as a differential pressure type structure with inflation function, which is called vacuum differential pressure charging valve or electromagnetic differential pressure valve. It is installed at the air inlet of the oil sealed mechanical pump. The valve and the pump are connected to the same power supply. The start and stop of the pump directly control the opening and closing of the valve. When the pump is stopped due to work demand or sudden power failure.

The valve uses atmospheric pressure to make the valve core fall down automatically, cut off the channel connected with the vacuum system, and release air into the pump at the same time, so as to prevent the mechanical pump oil from flowing back and contaminating the vacuum system, which plays a role in maintaining the vacuum system and is conducive to the mechanical pump starting again.

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single acting reciprocating vacuum pump working principle

Vacuum pump is a kind of widely used vacuum equipment, which can be divided into reciprocating, reverse type and so on. This paper focuses on the principle of reciprocating vacuum pump. 

The working principle diagram of single acting reciprocating vacuum pump: its working process is: when the piston moves to the right, the space volume on the left side of the piston in the cylinder increases, and the gas pressure drops. When the pressure drops to a little less than the pressure in the suction inlet pipe, the gas from the suction inlet opens the inlet valve and enters the cylinder. With the piston moving to the right, the gas continues to enter the cylinder until the piston moves to the end of the right, which is the suction process. In the suction process, because the gas pressure outside the exhaust valve is greater than the pressure in the cylinder, the exhaust valve can not be opened. When the piston begins to move to the left, the intake valve is closed by the hair in the cylinder, so that the gas can not flow back to the suction line. When the piston moves to a certain position, the gas in the cylinder is compressed to a pressure slightly higher than the outlet pressure, the exhaust valve is pushed open, and the gas in the cylinder is discharged until the piston moves to the end of the left side, which is the exhaust process. In this way, the reciprocating motion of the piston can form a vacuum at the suction pipe.

Reciprocating vacuum pump also has a single-stage and multi-stage difference. The vacuum degree of single-stage double acting high-speed vacuum pump can reach 10-20 mmHg (certain pressure). The multi-stage vacuum pump can reach higher vacuum degree.

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Vacuum and vacuum heat treatment

The so-called vacuum is a gaseous space with a pressure lower than 101.3kPa (1 atmospheric pressure). The concavity and convexity of the vacuum degree is indicated by the pressure size of the gas space, that is, the higher the vacuum degree, the lower the pressure. 

In operation, the vacuum degree of electric furnace is often divided into three levels: low vacuum, pressure is 1.33x103-13.3pa; medium vacuum, pressure is 13.3-1.33x10-2pa; high vacuum, pressure is 1.33x10-2-1.33x10-4pa. Now, most vacuum heat treatment furnaces use vacuum degree of 133-1.33x10-3pa

The so-called vacuum heat treatment means that all or part of the heat treatment process is carried out in vacuum. In practice, vacuum is regarded as a kind of protective gas with high purity, which can effectively avoid the reaction of oxidation and decarburization at high temperature, improve the surface quality of heat treatment or improve the effect of chemical heat treatment.

Now, vacuum heat treatment has been used in quenching, annealing, tempering, carburizing, nitriding, metallizing and other surface hardening, surface alloying and other processes. In terms of quenching, gas quenching, oil quenching, nitrate quenching and water quenching have been completed.

The primary equipment to obtain vacuum is the vacuum pump. Vacuum pumps commonly used in vacuum heat treatment furnace include rotary vane mechanical vacuum pump, slide valve mechanical vacuum pump, mechanical booster pump, oil booster pump and oil dispersion pump. The first three kinds of pumps are mechanical vacuum pumps, and the latter two are oil vapor vacuum pumps.

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Waste oil treatment in vacuum system

The process of recovering MgO · Cao by Si under the condition of high temperature and high vacuum is carried out by silicothermic method. In vacuum engineering, the front stage pump is h-slide valve pump, and the slide valve pump is oil pump. Generally, kk-1 vacuum pump oil is selected. In the recovery process, the dust, water or steam in the pellet will enter the pump cavity, which will emulsify the vacuum pump oil. The emulsified pump oil will damage the seal of the pump and make the vacuum degree of the system not reach the rated vacuum degree. That is to say, the effect of h-slide valve pump depends on the quality of vacuum pump oil. 

In the process of pumping, the vacuum pump oil has the characteristics of high viscosity and not easy to shrink, which can seal, smooth and cool the pump. However, after the dust and water (or steam) in the pellet are inhaled into the vacuum pump chamber, the vacuum pump oil is rapidly emulsified, turbid and degenerated, which makes the vacuum pump unable to play its role. The vacuum degree of the system immediately decreases, which affects the recovery reaction rate, and affects the quality and production value of magnesium. In order to not affect the quality and output value of crude magnesium during recovery, the oil must be changed It is assumed that the cost of magnesium production will be affected if it is not treated and reused.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump

High vacuum system pumping

One of the fundamental considerations in planning a high vacuum system is the time required to pump the vessel to a given pressure. The scale of this moment usually ranges from a few minutes to a few hours. However, in some cases, the pumping time may be seconds or days. It is very difficult to estimate the connection between time and pressure by theoretical or experimental methods, because the outgassing rate (outgassing or virtual leakage) on the inner and outer surface of the container can not be recognized, but the time and pressure of air extraction are related to the rate of outgassing. 

The outgassing of the given data depends on the temperature, the surface finish, the exposure to various atmospheres prior to this, and the cleaning method. When the outgassing is significant, even an approximate estimation of the exhaust time may be very difficult. The planner can estimate the pressure time curve from atmospheric pressure to about 10-2 Torr by using a connection equation suitable for higher pressure. According to the steady state (long time) outgassing data and the characteristics of the pumping equipment, the ultimate (limit) pressure can sometimes be estimated. The most interesting region is from 10-2 torr to the limit pressure.

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Working environment requirements of vacuum pump

Many ultra-high vacuum gauges have been developed in vacuum pumps, such as cold cathode magnetron gauge, suppression gauge and bend beam gauge. However, for many research work, it is not enough to rely on full pressure data alone. Let's learn about the ambient temperature of the water ring vacuum pump. 

For example, the process of adsorption, condensation and desorption in vacuum system involves the interaction between the material and the residual gas molecules on the surface of the vessel and inside the system. At this time, the data of gas composition and partial pressure in the system can explain the problem better than the full pressure data. Gas analysis and partial pressure measurement in vacuum are usually performed by dynamic mass spectrometer. If there are solid particles in the medium to be transported, filter screen should be added at the pump inlet; if there are ferromagnetic particles, magnetic filter should be added. The ambient temperature of water ring vacuum pump should be less than 40 ℃ and the temperature rise of motor should not exceed 75 ℃. After 1000 hours of normal operation of the magnetic pump, the bearing and end face moving ring shall be disassembled and inspected for wear, and the vulnerable parts that are not suitable for reuse shall be replaced. For the medium easy to precipitate and crystallize, the conveying liquid shall be cleaned in time after use to drain the liquid in the pump.

The vacuum pump must always be kept clean. Other objects shall not be placed on the water ring vacuum pump, and the channels around the vacuum pump shall not be blocked to facilitate maintenance and operation; the tightness of the triangular belt shall be paid attention to and adjusted; whether the air leakage occurs at the pipe joints and whether the pre vacuum in the box body drops, otherwise, it shall be repaired in time; the cooling water shall be checked regularly; the driving shall be conducted every time To start 4-6 times intermittently, within 2S each time, in order to overcome the larger torque when starting.



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The importance of shaft sleeve in water ring vacuum pump

Water ring vacuum pump, especially large water ring vacuum pump, is worth tens of thousands less and hundreds of thousands more. As the only assembly place of sealing rope with friction, the shaft sleeve plays the following roles in design and installation: 

1、 The shaft sleeve is generally made of wear-resistant alloy. It is characterized by wear resistance, high hardness, smooth surface and no rust, so it can protect the shaft from wear

2、 Due to the characteristics of the shaft sleeve, the wear of the sealing rope is reduced and the service life of the sealing rope is prolonged

3、 Ensure that the rotor will not be stuck and unable to rotate due to rust when the machine is shut down for a long time

4、 Convenient maintenance, reduce maintenance costs

At present, in order to reduce the cost, many manufacturers use cast iron material as shaft sleeve, which completely loses the original intention of shaft sleeve and has no effect.

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Gas drainage by vacuum pump / compressor

Gas accident is the most important thing in the coal mine industry in recent years. Therefore, the equipment safety of the coal mine industry can not be ignored. Since the 1950s, China began to carry out CBM drainage, and the amount of gas drainage increased continuously, which basically achieved the goal of coal mine safety and controlled the occurrence of gas accidents. There are several basic forms of gas drainage by imported vacuum pump / compressor 

According to the relationship between coal mining and drainage: pre pumping before mining, that is, the drainage of coalbed methane from the undeveloped coal seam. Because the mining area is wide and the pipeline is long, it usually has dozens of kilometers. The working environment is bad, so the imported vacuum pump / compressor is required to have large air volume, high vacuum degree and reliable operation. At present, the imported vacuum pump / compressor is designed and manufactured with international advanced technology, and the gas volume can reach 500 ~ 70000m3 / h, which can fully meet the needs of coal mining industry. This pumping method has gradually become the mainstream. This method not only becomes the guarantee of safe production, but also becomes a new clean energy, which has strategic significance for China, a big coal country. Pumping while excavating and mining while pumping, that is, CBM drainage in the process of coal seam mining. After mining drainage, namely abandoned mine, mining roadway CBM drainage.

The technology of gas drainage is to set up a gas pumping station on the ground and connect with the drainage borehole through the underground gas drainage pipeline system. When the pump is running, it will cause negative pressure, and the gas will be pumped out into the gas tank or directly supplied to the user. If the amount of gas extracted is small or unstable, it can be directly discharged into the atmosphere.

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Energy saving skills of water ring vacuum pump

Water ring vacuum pump is widely used in engineering construction, chemical plant, mechanical equipment and other industries. In the whole process of application, there will be excessive energy consumption. How can we reduce the kinetic energy consumption? 

1. Change the ring and adjust the radial clearance. In order to avoid more and more improper gap between the ring and radial of centrifugal impeller, please cooperate with the product delivery indication of water ring vacuum pump to carry out adjustment.

2. The filter screen can be removed when it can be kept clean.

3. The water ring vacuum pump is installed obliquely to lower the elbow. The water ring vacuum pump is installed obliquely or the turbine shell is turned into, so that the water outlet is facing the reservoir.

4. Reduce piping. In addition to one meter of seamless steel pipe, the diesel engine can be saved by 0.21kg in 10 hours.

5. Expand the outlet diameter. If the 4-meter long 10cm water output rubber hose is replaced by 15 cm pipe, 0.5kg diesel engine can be saved in 10 hours.

6. Remove pipe blockage immediately. Dirty things in the intake, centrifugal impeller or drainage shell channel, will reduce the discharge of water.

The environmental protection and energy saving of water ring vacuum pump can not only reduce energy consumption and control cost, but also improve the application efficiency of machinery and equipment and increase the service life.

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Difference between self suction centrifugal pump and general centrifugal pump

Self priming pump is also a centrifugal pump, it is divided into self-priming and general suction, often customers do not understand the difference between self-priming centrifugal pump and general centrifugal pump. 

The main reason is that the inlet pipe of the self-priming pump does not need to be installed with a bottom valve. After the water is filled for the first time, the water can be sucked up. There is no need to add water in the future. The pump body is larger than the centrifugal pump, Many of them have the function of water storage and life-long self-priming. Centrifugal pumps play a role of pressurization. The liquid level must be higher than the pump and can flow into the pump body before starting. If the liquid level is lower than that of the centrifugal pump, the bottom valve can only be installed at the suction inlet of the inlet pipe to fill the pump and pipeline with liquid, or install a draft tube at the inlet, such as For a centrifugal pump that has not worked for a long time, the water in the inlet pipe and pump body is basically gone when the pump is started for the second time. It is troublesome to operate again because the sealing of the inlet bottom valve of the centrifugal pump that has not been used for a long time can not achieve the effect of complete sealing, and the liquid will slowly leak back to the pool. Therefore, in the working conditions requiring self-priming function, the self-priming pump has better effect than the centrifugal pump Better. 

The self-priming centrifugal pump adopts the pump body structure of axial return liquid. The centrifugal pump body is composed of suction chamber, liquid storage chamber, scroll chamber, return hole, gas-liquid separation chamber, etc. after the centrifugal pump starts normally, the impeller will absorb the liquid stored in the suction chamber and the air in the suction pipe together, and can be completely mixed in the impeller. Under the action of centrifugal force, the liquid entrained with the gas flows to the outer edge of the scroll chamber, forming a certain thickness of white on the outer edge of the impeller Color foam tape and high speed rotating liquid ring. The gas-liquid mixture enters the gas separation chamber through a diffusion tube. At this time, due to the sudden decrease of the flow rate, the lighter gas is separated from the mixed liquid, and the gas continues to rise and discharge through the pump body outlet. The degassed liquid returns to the liquid storage chamber, and enters the impeller again through the return hole, and mixes with the gas inhaled from the suction pipe inside the impeller again, and flows to the outer edge of the impeller under the action of the high-speed rotating impeller.

As this process goes on again and again, the air in the suction pipe is continuously reduced, until the air is exhausted, the self-priming pump completes the self-priming process, and the centrifugal pump is put into normal operation. Because the centrifugal pump has this unique exhaust capacity, the self-priming pump can transport liquid containing gas without installing bottom valve. It has good sweeping function when used on cruise ship.

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Installation of water ring vacuum pump

The premise of vacuum pump operation is correct installation. If it is not properly installed, there will be many faults that can not run. How should each part of water ring vacuum pump be installed? 

1、 Install the pump body and mechanical seal

The static ring part of the mechanical seal is installed on the pump body. When the static ring part of the mechanical seal is installed, it can be wetted with water and then evenly pressed into the pump body by hand. Pay attention not to use too much force! After assembly, check whether the static ring part of mechanical seal and pump body are assembled tightly. 

Press the pump body tightly on the motor and tighten the bolts. Pay attention not to damage the static ring part of mechanical seal. Install the washer into the motor rear cover, and then install the pump body, motor front cover, bearing, motor rotor and inner bearing cover into the motor housing, and lock the bolts. Install the motor fan, retaining ring, motor shield and screw in turn. After installation, the fan shield end of the motor of the pump shall face down and be vertical to the ground, and other parts of the pump shall be ready to be installed.

CL Sereis Cone Liquid Ring Vacuum Pump

Roots Blowers

Roots Vacuum Pump 

rotary vane vacuum pump temperature requirements

The working principle of rotary vane vacuum pump is known to all. But the temperature of rotary vane vacuum pump is too high. It refers to the maximum oil temperature measured near the low-level exhaust valve that exceeds the value specified in the instruction manual. Rotary vane vacuum pump is generally used at room temperature no less than 5 and relative temperature no higher than 90%. The gas enters the high vacuum chamber from the intake nozzle. At first, the high and low vacuum chambers are filled with atmosphere, and both exhaust valves are opened for exhaust. 

With the progress of air pumping, the air pressure decreases (i.e. the vacuum degree increases). The pressure in the high vacuum chamber is not enough to push the exhaust valve open. The gas enters the low vacuum chamber through the middle partition plate. At this time, the pressure is not enough to open the exhaust valve. However, there is a certain amount of oil entering the low vacuum chamber to help push open the exhaust valve, and the gas will be discharged. The discharged gas is mixed with oil particles, which are filtered by the oil screen to separate the oil. Only the gas is discharged from the pump.

The oil in the oil seal chamber of the rotary vane vacuum pump is supplied by the oil pool a through the hole on the front plate. The oil in the low vacuum chamber is supplied by the oil pool a through the holes in the rear end plate. The oil in the high vacuum chamber is circularly supplied by the hole in the middle diaphragm. The oil in the oil seal chamber of the rotary vane vacuum pump is supplied by the oil pool a through the hole on the front plate. The oil in the low vacuum chamber is supplied by the oil pool a through the holes in the rear end plate. The oil in the high vacuum chamber is circularly supplied by the hole in the middle diaphragm. The seal of the front and rear end covers of the rotary vane vacuum pump is sealed by the oil pool B on the upper part of the pump body and flowing into the oil groove through the hole in the end face chamber of the pump body.


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