Lubricating and sealing assembly of vacuum pump

Abstract

The utility model discloses a vacuum pump lubricating and sealing assembly which aims to solve the problems that in the prior art, due to the fact that the oil temperature of a rear cover rises, pressure in a cavity is increased, the service life of an oil seal is affected, and an oil plug leaks oil due to the fact that the pressure cannot be released. The technical problem is solved through the following technical scheme that the sealing device comprises a rear cover arranged at the sealing position of a rotating shaft, a balance valve and an oil storage valve, the balance valve and the oil storage valve are arranged on the upper side wall of the rear cover, an oil cavity for containing liquid is formed in the rear cover, a mounting hole is formed in the side wall of the rear cover in a penetrating mode, and the oil storage valve is arranged at the end, close to the inner side of the rear cover, of the mounting hole. The balance valve is arranged at one end, close to the outer side of the rear cover, of the mounting hole. According to the oil seal, the balance valve and the oil storage valve are arranged at the sealing position of the rotating shaft, the balance valve can balance the pressure between the rear cover and the outside, the oil pressure in the rear cover is kept within a normal range, and therefore the situation that the service life of the oil seal is affected due to the fact that the pressure of the oil cavity in the rear cover rises can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, and more specifically, it relates to a lubricating and sealing assembly for a vacuum pump. Background Art

[0002] The lubricating and sealing technology of pumps is widely applied to some mechanical equipment such as vacuum pumps and centrifugal pumps, especially in some working conditions in the chemical industry with particles, liquids, and corrosive media. The lubricating and sealing technology directly affects the service life of mechanical equipment. The existing lubricating and sealing has the following disadvantages: 1. After the oil temperature rises, the pressure in the cavity increases, and the pressure cannot be released and acts on the lip surface of the oil seal, increasing the friction between the lip surface and the shaft sleeve and affecting the service life of the oil seal. 2. After the oil temperature rises, the pressure in the cavity increases, and the pressure cannot be released and acts on the cavity, which may cause the cavity to rupture. 3. After the oil temperature rises, the pressure in the cavity increases, and the pressure cannot be released, resulting in problems such as oil leakage from the oil plug. Summary of the Utility Model

[0003] The utility model overcomes the problems in the prior art that due to the increase in oil temperature, the pressure in the cavity increases, and due to the inability to release the pressure, problems such as affecting the service life of the oil seal and oil leakage from the oil plug occur. The utility model provides a lubricating and sealing assembly for a vacuum pump, which can maintain the pressure balance in the oil cavity, thereby preventing the pressure in the oil cavity from being too high, further improving the service life of the oil seal, and preventing the oil in the oil cavity from overflowing.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme: A lubricating and sealing assembly for a vacuum pump, comprising: a rear cover arranged at the shaft sealing position, a balance valve and an oil storage valve arranged on the upper side wall of the rear cover. An oil cavity for containing liquid is arranged in the rear cover. An installation hole penetrates through the side wall of the rear cover. The oil storage valve is arranged at one end of the installation hole close to the inner side of the rear cover, and the balance valve is arranged at one end of the installation hole close to the outer side of the rear cover.

[0005] In this application, by arranging a balance valve and an oil storage valve at the shaft sealing position, the balance valve can balance the pressure between the rear cover and the outside, keeping the oil pressure in the rear cover within a normal range, thereby preventing the pressure in the oil cavity of the rear cover from rising and acting on the lip surface of the oil seal due to the inability to release the pressure, increasing the friction between the lip surface and the shaft sleeve and affecting the service life of the oil seal. In addition, it can also prevent the problem of oil leakage from the oil plug due to the increase in pressure in the oil cavity and the inability to release the pressure. And by arranging the oil storage valve, it can prevent oil from entering the balance valve through the oil storage valve, reduce the loss of oil, and recover the oil in the oil-gas mixture.

[0006] Preferably, the oil storage valve includes an oil storage cavity, and a reflux hole is arranged at the bottom of the oil storage cavity.

[0007] The return hole enables the oil to flow back, reducing the loss caused by oil volatilization.

[0008] Preferably, an oil baffle is arranged in the oil storage cavity. The oil baffle divides the oil storage cavity into upper and lower chambers. An air-breaking port is arranged on the side wall of the upper chamber, and an oil plate hole is arranged at the bottom of the oil baffle.

[0009] The oil baffle can block the oil-gas mixture, thereby preventing the oil from entering the balance valve and preventing the reduction of oil. The setting of the air-breaking port enables the pressure in the oil storage valve to be balanced, making the oil flow back to the oil cavity more smoothly through the return hole.

[0010] Preferably, the balance valve includes a condensation cavity, a vent hole arranged on the side wall of the condensation cavity and communicating with the installation hole, and a balance ball arranged inside the condensation cavity. The balance ball is arranged at the top of the vent hole by gravity to block the vent hole.

[0011] The balance ball blocks the vent hole by its own gravity. When the pressure inside the rear cover oil cavity increases to a certain extent, the gas will push the balance ball open. After the pressure inside the oil cavity is released, the balance ball blocks the vent hole again by its own gravity. Therefore, the pressure adjusted by the balance valve can be adjusted by changing the gravity of the balance ball itself.

[0012] Preferably, a communication nozzle communicating with the outside is arranged on the side wall of the condensation cavity, and a sealing cap matching with it is arranged on the communication nozzle.

[0013] By closing or opening the communication nozzle with the sealing cap, the opening or closing of the balance valve can be controlled.

[0014] Preferably, an annular arc adapted to the balance ball is arranged in the circumferential direction at the end of the vent hole close to the condensation cavity.

[0015] The annular arc is adapted to the balance ball, so that the annular arc just fits the outer surface of the balance ball, thereby improving the sealing effect of the balance ball on the vent hole.

[0016] Preferably, the volume of the upper chamber is smaller than that of the lower chamber.

[0017] The space of the lower chamber is larger, which is beneficial to blocking the oil-gas mixture from entering the balance valve. The upper chamber is mainly used to balance the pressure inside the lower chamber, making it easier for the oil to flow into the oil cavity from the return hole.

[0018] Preferably, an oil drain hole is arranged at the bottom of the rear cover.

[0019] The oil drain hole can facilitate the replacement of the oil in the oil cavity.

[0020] Compared with the prior art, the beneficial effects of the present utility model are:

[0021] The utility model sets a balance valve and an oil storage valve at the shaft seal position. The balance valve can balance the pressure between the rear cover and the outside world, so that the oil pressure in the rear cover is maintained within a normal range, thereby preventing the oil pressure in the oil cavity of the rear cover from rising, and due to the inability to release the pressure, acting on the lip surface of the oil seal, increasing the friction between the lip surface and the shaft sleeve, and affecting the service life of the oil seal. In addition, it can also prevent the problem of oil leakage from the oil plug due to the increase in pressure in the oil cavity and the inability to release the pressure. And by setting the oil storage valve, it can prevent oil from entering the balance valve through the oil storage valve, reduce the loss of oil, and recycle the oil in the oil-gas mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the utility model.

[0023] Figure 2 is a schematic diagram of the structures of the oil storage valve and the balance valve of the utility model.

[0024] Figure 3 is a schematic diagram of the structures of the oil storage valve and the balance valve in another embodiment of the utility model.

[0025] In the figure: 1. Rear cover, 11. Oil cavity, 12. Mounting hole;

[0026] 2. Balance valve, 21. Condensation cavity, 22. Air vent hole, 23. Balance ball, 24. Connecting end pipe, 25. Connecting nozzle, 26. Sealing cap, 27. Adjusting pipe orifice, 28. Adjusting cover, 29. Adjusting spring;

[0027] 3. Oil storage valve, 31. Return hole, 32. Oil baffle, 33. Air breaking port, 34. Oil plate hole;

[0028] 4. Vacuum screw, 41. Shaft;

[0029] 5. Pump body, 51. Side cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will further specifically describe the technical solutions of the utility model through specific embodiments in combination with the drawings:

[0031] Embodiment 1: Referring to Figures 1 to 2 As shown, a lubricating and sealing assembly for a vacuum pump includes: a rear cover 1 provided at the seal position of the shaft 41, a balance valve 2 provided on the upper side wall of the rear cover 1, and an oil storage valve 3. An oil cavity 11 for containing liquid is provided in the rear cover 1. A mounting hole 12 penetrates through the side wall of the rear cover 1. The oil storage valve 3 is provided at one end of the mounting hole 12 close to the inner side of the rear cover 1, and the balance valve 2 is provided at one end of the mounting hole 12 close to the outer side of the rear cover 1.

[0032] In this application, by providing a balance valve 2 and an oil storage valve 3 at the sealed position of the rotating shaft 41, the balance valve 2 can balance the pressure between the rear cover 1 and the outside, keeping the oil pressure inside the rear cover 1 within a normal range. This can prevent the pressure in the oil chamber 11 inside the rear cover 1 from rising and acting on the lip surface of the oil seal due to the inability to release the pressure, increasing the friction between the lip surface and the shaft sleeve and affecting the service life of the oil seal. Additionally, it can prevent the problem of oil leakage from the oil plug due to the rising pressure in the oil chamber 11 and the inability to release the pressure. Moreover, by providing the oil storage valve 3, it can prevent oil from entering the balance valve 2 through the oil storage valve 3, reduce the loss of oil, and recover the oil in the oil-gas mixture.

[0033] Embodiment 2: Refer to Figures 1 to 2 As shown, a lubricating and sealing assembly for a vacuum pump includes: a rear cover 1 provided at the sealed position of the rotating shaft 41, a balance valve 2 and an oil storage valve 3 provided on the upper side wall of the rear cover 1. An oil chamber 11 for containing liquid is provided inside the rear cover 1. An installation hole 12 is penetratingly provided on the side wall of the rear cover 1. The oil storage valve 3 is provided at one end of the installation hole 12 close to the inner side of the rear cover 1, and the balance valve 2 is provided at one end of the installation hole 12 close to the outer side of the rear cover 1.

[0034] This application can be used in various technical fields that require lubrication and sealing, such as vacuum pumps and centrifugal pumps. In this application, a vacuum pump is taken as an example. A vacuum screw 4 is provided inside the pump body 5 of the vacuum pump. A side cover 51 is provided on the outer side wall of the pump body 5. A rotating shaft 41 is provided at the end of the vacuum screw 4. The rotating shaft 41 is rotatably provided in the side cover 51. A rear cover 1 is provided on the side of the side cover 51 away from the pump body 5. Lubricating oil is provided inside the rear cover 1. The rear cover 1 completely wraps the end of the rotating shaft 41. The lubricating oil inside the rear cover 1 continuously lubricates the rotating shaft 41, reducing the friction force received when the rotating shaft 41 rotates.

[0035] The oil storage valve 3 and the balance valve 2 are provided on the same axis, and the oil storage valve 3 and the balance valve 2 are provided on the upper side wall of the rear cover 1. On the upper side wall of the rear cover 1, the balance valve 2 is provided above the oil storage valve 3. The oil-gas mixture needs to pass through the oil storage valve 3 first and then release pressure at the position of the balance valve 2.

[0036] The oil storage valve 3 is cylindrical and is arranged inside the rear cover 1. A return hole 31 is provided at the bottom of the oil storage valve 3, and the return hole 31 enables the oil to flow back, reducing the waste caused by oil volatilization. An oil baffle 32 is arranged in the oil storage cavity 11. The oil baffle 32 divides the oil storage cavity 11 into upper and lower chambers, namely the upper chamber and the lower chamber. An air breaking port 33 is provided on the side wall of the upper chamber, and an oil plate hole 32 is provided on the oil baffle 32. The oil baffle 32 can block the oil-gas mixture, thereby preventing the oil from entering the balance valve 2 and preventing the reduction of oil. The setting of the air breaking port 33 enables the pressure inside the oil storage valve 3 to be balanced, making the oil flow back to the oil cavity 11 more smoothly through the return hole 31.

[0037] The volume of the upper chamber is smaller than that of the lower chamber. The larger space of the lower chamber is beneficial to blocking the oil-gas mixture from entering the balance valve 2, while the upper chamber is mainly used to balance the internal pressure of the lower chamber, making it easier for the oil to flow into the oil cavity 11 from the return hole 31.

[0038] The balance valve 2 includes a condensation chamber 21, a vent hole 22 provided on the side wall of the condensation chamber 21 and communicating with the mounting hole 12, and a balance ball 23 arranged inside the condensation chamber 21. The balance ball 23 is arranged at the top of the vent hole 22 by gravity to block the vent hole 22. The condensation chamber 21 is also cylindrical. A connecting end pipe 24 extends outward from one end of the condensation chamber 21. The connecting end pipe 24 is cylindrical. The vent hole 22 is arranged inside the connecting end pipe 24, and the vent hole 22 penetrates the connecting end pipe 24 to communicate the condensation chamber 21 with the outside. In this application, the connecting end pipe 24 is connected to the mounting hole 12, so that the condensation chamber 21 is connected to the inside of the oil cavity 11 through the connecting end pipe 24. The connecting end pipe 24 is also arranged along the vertical direction, and the balance ball 23 is arranged at the top of the connecting end pipe 24, that is, the balance ball 23 is arranged at the top of the vent hole 22. The balance ball 23 blocks the vent hole 22 by its own gravity. When the pressure inside the oil cavity 11 of the rear cover 1 increases to a certain extent, the gas will push the balance ball 23 open. After the pressure inside the oil cavity 11 is released, the balance ball 23 blocks the vent hole 22 again by its own gravity. Therefore, the pressure adjusted by the balance valve 2 can be adjusted by changing the gravity of the balance ball 23 itself.

[0039] In addition, the balance ball 23 in this application is made of PTFE material, which can resist oil and corrosion.

[0040] The side wall of the condensation chamber 21 is provided with a communication nozzle 25 communicating with the outside, and a sealing cap 26 is arranged on the communication nozzle 25 and cooperates with it. The communication nozzle 25 mainly communicates the condensation chamber 21 with the outside, so that the pressure inside the oil chamber 11 can be balanced with the outside. The sealing cap 26 is threadedly connected to the communication nozzle 25. By closing or opening the communication nozzle 25 with the sealing cap 26, the opening or closing of the balance valve 2 can be controlled.

[0041] An annular arc adapted to the balance ball 23 is arranged in the circumferential direction at the end of the air discharge hole 22 close to the condensation chamber 21. The annular arc is adapted to the balance ball 23, so that the annular arc just fits the outer surface of the balance ball 23, thereby improving the sealing effect of the balance ball 23 on the air discharge hole 22.

[0042] An oil discharge hole is arranged at the bottom of the rear cover 1. The oil discharge hole can facilitate the replacement of the oil liquid in the oil chamber 11.

[0043] The working principle of this application is as follows: After removing the sealing cap 26, when the pressure inside the oil chamber 11 increases to a certain extent, the balance ball 23 is pushed upward, so that the gas in the oil chamber 11 leaks out from the air discharge hole 22. When the pressure in the oil chamber 11 decreases, the balance valve 2 blocks the air discharge hole 22 again, so that the inside of the oil chamber 11 remains in a sealed state.

[0044] The condensation chamber 21 can condense and recover the oil-gas mixture, so that when the balance valve 2 is opened, it can flow into the oil chamber 11 along the air discharge hole 22. The oil baffle 32 can block the oil-gas mixture, thereby preventing the oil liquid from entering the balance valve 2 and preventing the reduction of the oil liquid. The setting of the air breaking port 33 enables the pressure in the oil storage valve 3 to be balanced, so that the oil liquid can flow back to the oil chamber 11 more smoothly through the return hole 31.

[0045] In this application, by arranging the balance valve 2 and the oil storage valve 3 at the sealing position of the rotating shaft 41, the balance valve 2 can balance the pressure between the rear cover 1 and the outside, so that the oil pressure inside the rear cover 1 is maintained within a normal range, thereby preventing the pressure in the oil chamber 11 inside the rear cover 1 from rising and acting on the oil seal lip surface due to the inability to release the pressure, resulting in an increase in the friction force between the lip surface and the shaft sleeve and affecting the service life of the oil seal. In addition, it can also prevent the problem of oil plug oil leakage due to the increase in pressure in the oil chamber 11 and the inability to release the pressure. And by arranging the oil storage valve 3, it can prevent oil from entering the balance valve 2 through the oil storage valve 3, reduce the loss of oil liquid, and recover the oil liquid in the oil-gas mixture.

[0046] Example 3: Refer to Figures 1 to 3As shown in the figure, a lubricating and sealing assembly for a vacuum pump includes: a rear cover 1 provided at the sealing position of the rotating shaft 41, a balance valve 2 provided on the upper side wall of the rear cover 1, and an oil storage valve 3. An oil cavity 11 for containing liquid is provided inside the rear cover 1. An installation hole 12 is penetrated through the side wall of the rear cover 1. The oil storage valve 3 is provided at one end of the installation hole 12 close to the inner side of the rear cover 1, and the balance valve 2 is provided at one end of the installation hole 12 close to the outer side of the rear cover 1.

[0047] This application can be used in technical fields such as various vacuum pumps and centrifugal pumps that require lubrication and sealing. In this application, a vacuum pump is taken as an example. A vacuum screw 4 is provided inside the pump body 5 of the vacuum pump. A side cover 51 is provided on the outer side wall of the pump body 5. A rotating shaft 41 is provided at the end of the vacuum screw 4. The rotating shaft 41 is rotatably provided in the side cover 51. A rear cover 1 is provided on the side of the side cover 51 away from the pump body 5. Lubricating oil is provided inside the rear cover 1. The rear cover 1 completely wraps the end of the rotating shaft 41. The lubricating oil inside the rear cover 1 continuously lubricates the rotating shaft 41, reducing the friction force suffered by the rotating shaft 41 during rotation.

[0048] The oil storage valve 3 and the balance valve 2 are provided on the same axis, and the oil storage valve 3 and the balance valve 2 are provided on the upper side wall of the rear cover 1. On the upper side wall of the rear cover 1, the balance valve 2 is provided above the oil storage valve 3. The oil-gas mixture needs to first pass through the oil storage valve 3 and then relieve pressure at the position of the balance valve 2.

[0049] The oil storage valve 3 is cylindrical in shape and is provided inside the rear cover 1. A return hole 31 is provided at the bottom of the oil storage valve 3. The return hole 31 can enable the oil liquid to flow back, reducing the waste caused by the evaporation of the oil liquid. An oil baffle 32 is provided inside the oil storage cavity 11. The oil baffle 32 divides the oil storage cavity 11 into upper and lower two chambers, which are the upper chamber and the lower chamber respectively. An air-breaking port 33 is provided on the side wall of the upper chamber, and an oil plate hole 32 is provided on the oil baffle 32. The oil baffle 32 can block the oil-gas mixture, thereby preventing the oil liquid from entering the balance valve 2 and preventing the reduction of the oil liquid. The setting of the air-breaking port 33 enables the pressure inside the oil storage valve 3 to be balanced, making the oil liquid flow back into the oil cavity 11 more smoothly through the return hole 31.

[0050] The volume of the upper chamber is smaller than that of the lower chamber. The space of the lower chamber is larger, which is beneficial to blocking the oil-gas mixture from entering the balance valve 2. The upper chamber is mainly used to balance the pressure inside the lower chamber, making it easier for the oil liquid to flow into the oil cavity 11 from the return hole 31.

[0051] The balance valve 2 includes a condensation chamber 21, an air vent 22 provided on the side wall of the condensation chamber 21 and communicating with the mounting hole 12, and a balance ball 23 provided inside the condensation chamber 21. The balance ball 23 is arranged at the top of the air vent 22 by gravity to block the air vent 22. The condensation chamber 21 is also cylindrical. At one end of the condensation chamber 21, a connecting end pipe 24 extends outward. The connecting end pipe 24 is cylindrical. The air vent 22 is provided inside the connecting end pipe 24, and the air vent 22 penetrates through the connecting end pipe 24 to connect the condensation chamber 21 with the outside. In this application, the connecting end pipe 24 is connected to the mounting hole 12, so that the condensation chamber 21 is connected to the inside of the oil chamber 11 through the connecting end pipe 24. The connecting end pipe 24 is also arranged along the vertical direction, and the balance ball 23 is arranged at the top of the connecting end pipe 24, that is, the balance ball 23 is arranged at the top of the air vent 22. The balance ball 23 blocks the air vent 22 by its own gravity. When the pressure inside the oil chamber 11 of the rear cover 1 increases to a certain extent, the gas will push the balance ball 23 open. After the pressure inside the oil chamber 11 is released, the balance ball 23 blocks the air vent 22 again by its own gravity. In addition, the balance ball 23 in this application is made of PTFE material, which can resist oil and corrosion.

[0052] Referring to Figure 3 As shown, an adjustment pipe orifice 27 is provided at the top of the condensation chamber 21. An adjustment cover 28 is provided outside the adjustment pipe orifice 27. The adjustment cover 28 is in threaded cooperation with the adjustment pipe orifice 27. An adjustment spring 29 is abutted between the adjustment cover 28 and the balance ball 23. By rotating the position of the adjustment cover 28 on the adjustment pipe orifice 27, the compressed length of the adjustment spring 29 can be controlled, and thus the pressure exerted by the spring on the balance valve 2 can be controlled, so that the magnitude of the pressure control of the balance valve 2 on the oil chamber 11 can be adjusted. Compared with Embodiment 1, the effect of adjusting the pressure of the balance valve 2 can be achieved without changing the weight of the balance valve 2.

[0053] A communication nozzle 25 communicating with the outside is provided on the side wall of the condensation chamber 21. In this embodiment, the communication nozzle 28 is provided on the adjustment cover 28, and a sealing cap 26 cooperating with it is provided on the communication nozzle 25. The communication nozzle 25 mainly communicates the condensation chamber 21 with the outside, so that the pressure inside the oil chamber 11 can be balanced with the outside. The sealing cap 26 is in threaded connection with the communication nozzle 25. By closing or opening the communication nozzle 25 with the sealing cap 26, the opening or closing of the balance valve 2 can be controlled.

[0054] An annular arc adapted to the balance ball 23 is provided in the circumferential direction at the end of the air vent 22 close to the condensation chamber 21. The arc ring is adapted to the balance ball 23, so that the arc ring just fits the outer surface of the balance ball 23, thereby improving the sealing effect of the balance ball 23 on the air vent 22.

[0055] An oil drain hole is provided at the bottom of the rear cover 1. The oil drain hole facilitates the replacement of the oil in the oil chamber 11.

[0056] The working principle of this application is as follows: Remove the sealing cap 26. After the pressure inside the oil chamber 11 increases to a certain extent, the balance ball 23 is pushed upward, causing the gas in the oil chamber 11 to leak out through the air vent 22. When the pressure in the oil chamber 11 decreases, the balance valve 2 blocks the air vent 22 again, keeping the oil chamber 11 in a sealed state.

[0057] The condensation chamber 21 can condense and recover the oil-gas mixture, enabling it to flow into the oil chamber 11 along the air vent 22 when the balance valve 2 is opened. The oil baffle 32 can block the oil-gas mixture, preventing the oil from entering the balance valve 2 and reducing the loss of oil. The air break port 33 is provided to balance the pressure in the oil storage valve 3, allowing the oil to flow back into the oil chamber 11 more smoothly through the return hole 31.

[0058] In this application, by providing the balance valve 2 and the oil storage valve 3 at the sealed position of the rotating shaft 41, the balance valve 2 can balance the pressure between the rear cover 1 and the outside, keeping the oil pressure inside the rear cover 1 within a normal range. This can prevent the pressure in the oil chamber 11 inside the rear cover 1 from rising and acting on the oil seal lip surface due to the inability to release the pressure, increasing the friction between the lip surface and the shaft sleeve and affecting the service life of the oil seal. Additionally, it can prevent the problem of oil seeping from the oil plug due to the increase in pressure in the oil chamber 11 and the inability to release the pressure. And by providing the oil storage valve 3, it can prevent oil from entering the balance valve 2 through the oil storage valve 3, reduce the loss of oil, and recover the oil in the oil-gas mixture.

[0059] The above-described embodiments are only preferred solutions of the present utility model and do not impose any form of limitation on the present utility model. There are other variations and modifications without exceeding the technical solutions described in the claims.

Claims

1. A vacuum pump lubrication seal assembly, characterized in that: include: A rear cover is arranged at the sealing position of the rotating shaft, a balancing valve and an oil storage valve are arranged on the upper side wall of the rear cover, an oil chamber for containing liquid is arranged inside the rear cover, a mounting hole is penetrated through the side wall of the rear cover, the oil storage valve is arranged at one end of the mounting hole close to the inner side of the rear cover, and the balancing valve is arranged at one end of the mounting hole close to the outer side of the rear cover; the balancing valve includes a condensation chamber, an air leakage hole arranged on the side wall of the condensation chamber and connected with the mounting hole, and a balancing ball arranged inside the condensation chamber, and the balancing ball is arranged on the top of the air leakage hole to seal the air leakage hole by gravity.

2. The vacuum pump lubrication seal assembly according to claim 1, characterized in that: The oil storage valve comprises an oil storage cavity, and a reflux hole is arranged at the bottom of the oil storage cavity.

3. The vacuum pump lubrication seal assembly according to claim 2, characterized in that: An oil baffle is arranged in the oil storage cavity, and the oil baffle divides the oil storage cavity into two upper and lower chambers. A piercing opening is arranged on the side wall of the upper chamber, and an oil plate hole is arranged at the bottom of the oil baffle.

4. The vacuum pump lubrication seal assembly according to claim 1, characterized in that: The side wall of the condensation chamber is provided with a communication nozzle communicating with the outside, and a sealing cap matched with the communication nozzle is provided on the communication nozzle.

5. The vacuum pump lubrication seal assembly according to claim 1, characterized in that: A circular arc matching the balancing ball is arranged in the circumferential direction of the end of the air leakage hole close to the condensation chamber.

6. The vacuum pump lubrication seal assembly according to claim 3, characterized in that: The volume of the upper chamber is smaller than the volume of the lower chamber.

7. The vacuum pump lubricating seal assembly according to claim 1 or 2 or 3 or 6, characterized in that: An oil drain hole is provided at the bottom of the rear cover.

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