Lower row circulating self-cleaning rotary vane vacuum pump

Abstract

The utility model relates to a vacuum pump technical field especially relates to a lower row formula circulating self -cleaning rotary vane vacuum pump, including frame, machine body, air inlet, exhaust port, vacuum subassembly, communicating vessel, rotating assembly and lubricating oil circulating component, frame is used to support the whole, the machine body is provided with pump cavity, vacuum subassembly sets up in the pump cavity, air inlet is used for gas to enter the pump cavity, exhaust port is used for gas to discharge from the pump cavity, rotating assembly is used for driving vacuum subassembly rotation, lubricating oil circulating component includes the oil tank, oil inlet pipe and oil outlet pipe of setting in the machine body outside, the oil tank is filled with lubricating oil, the oil tank communicates with the pump cavity through the oil inlet pipe, oil outlet pipe communicates with the bottom of pump cavity through communicating vessel. The utility model has adopted lubricating oil self -priming and lower row formula design, can continuously inhale lubricating oil in the pump cavity, and the impurity etc. in the pump cavity is in time discharged in the continuous circulation process of the continuous inhale and discharge of lubricating oil.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, and in particular to a bottom-discharge circulating self-cleaning rotary vane vacuum pump. Background Technology

[0002] Carbon-carbon composites (C / C) and carbon-ceramic composites (C / SiC) are two advanced high-temperature (2600℃) structural materials widely used in spacecraft thermal protection, high-speed braking systems, aircraft brake discs, nuclear reactor structural components, and hypersonic vehicle components. The preparation of these materials requires a vacuum pump environment, which is extremely complex, containing large amounts of high-hardness dust and abrasive particles, as well as corrosive and harmful gases. Based on actual production use, only rotary vane vacuum pumps are currently usable among all vacuum pumps available domestically and internationally, but their service life is far below design requirements. The main reason is that most existing rotary vane vacuum pumps use a top-exhaust structure, which draws in large amounts of high-hardness silicon carbide abrasive particles and dust during operation. These particles cannot be discharged in time and accumulate within the pump chamber, causing rapid wear of the moving parts and significantly reducing their service life (720 hours). In addition, the gas pumped by the vacuum pump contains a large amount of corrosive and toxic gases. The pump chamber must be cleaned after a working cycle. Because the existing vacuum pump adopts an upward exhaust structure, cleaning the inside is very troublesome. This reduces production efficiency, increases production costs, fails to meet the needs of continuous and efficient production, and requires frequent maintenance. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the aforementioned background technology by providing a rotary vane vacuum pump that has self-priming lubrication and continuous self-cleaning functions, can operate stably in complex environments, has a long service life, and is easy to maintain.

[0004] To achieve the above objectives, this utility model provides a bottom-discharge circulating self-cleaning rotary vane vacuum pump, including a frame, body, air inlet, air outlet, vacuum assembly, communicating vessel, rotating assembly, and lubricating oil circulation assembly.

[0005] The frame is used to support the whole, the body is provided with a pump chamber, the vacuum component is disposed in the pump chamber to generate a vacuum, the bottom of the pump chamber is provided with a discharge channel so that the pump chamber is a bottom discharge structure, and the rotating component is used to drive the vacuum component to rotate.

[0006] The lubricating oil circulation assembly includes an oil tank, an oil inlet pipe, and an oil outlet pipe disposed outside the machine body. The oil tank is filled with lubricating oil. The oil tank is connected to the pump chamber through the oil inlet pipe. The vacuum assembly generates a vacuum to automatically draw the lubricating oil from the oil tank into the pump chamber. The oil outlet pipe is connected to the discharge channel of the pump chamber through the communicating vessel. The air inlet is used for gas to enter the pump chamber, and the exhaust port is connected to the communicating vessel.

[0007] Furthermore, a filter structure is provided inside the oil tank near the oil drain pipe, and the filter structure is used to filter impurities.

[0008] Furthermore, the pump chamber includes a first sub-pump chamber and a second sub-pump chamber, the first sub-pump chamber and the second sub-pump chamber are connected through the communicating vessel, and the vacuum assembly includes a first vacuum assembly and a second vacuum assembly.

[0009] Furthermore, the first vacuum assembly includes a first end cap, a first rotor, a first vane, and a first sealing ring. The first end cap is detachably connected to the first sub-pump chamber. The first end cap has a central hole for the rotating assembly to enter. The first rotor is rotatably disposed in the first sub-pump chamber. The first vane is connected to the first rotor and rotates synchronously with the first rotor. The first sealing ring is used to seal the position where the rotating assembly enters the first sub-pump chamber.

[0010] Furthermore, the first vacuum assembly also includes a sealing ring retainer, which is installed at the center hole of the first end cap to press and fix the first sealing ring.

[0011] Furthermore, the second vacuum assembly includes a second end cap, a second rotor, a second vane, and a second sealing ring. The second end cap is detachably connected to the second sub-pump chamber. The second rotor is rotatably disposed within the second sub-pump chamber. The second vane is connected to the second rotor and rotates synchronously with the second rotor. The second sealing ring is used to seal the position where the rotating assembly enters the second sub-pump chamber.

[0012] Furthermore, the communicating vessel is a two-stage communicating vessel, comprising a communicating seat, a first channel and a second channel formed on the communicating seat, a communicating cavity provided within the communicating seat, an exhaust port communicating with the communicating cavity, an air inlet communicating with the first sub-pump cavity, an exhaust channel of the first sub-pump cavity communicating with the first channel, the first channel communicating with the second sub-pump cavity, a first one-way valve plate provided at a corresponding position of the first channel, the first channel being able to communicate unidirectionally with the communicating cavity when the first one-way valve plate is opened, the exhaust channel of the second sub-pump cavity communicating with the second channel, the second channel communicating with the communicating cavity, a second one-way valve plate provided at a corresponding position of the second channel, the second sub-pump cavity being able to communicate unidirectionally with the communicating cavity when the second one-way valve plate is opened.

[0013] Furthermore, the rotating assembly includes a rotating shaft, a motor, a drive wheel, a driven wheel, a transmission belt, and bearings. The rotating shaft extends into the interior of the first sub-pump chamber and the second sub-pump chamber, and is connected to the first rotor and the second rotor to maintain synchronous rotation. The bearings are disposed in the first sub-pump chamber and / or the second sub-pump chamber to support the rotating shaft. The motor is mounted on the frame, the drive wheel is connected to the output end of the motor, and the transmission belt is sleeved between the drive wheel and the driven wheel.

[0014] The above-mentioned solution of this utility model has the following beneficial effects:

[0015] The rotary vane vacuum pump provided by this utility model adopts a self-priming and bottom-discharge design for lubricating oil, which allows the pump chamber to continuously draw in lubricating oil during operation, thereby lubricating the moving parts inside the pump chamber and sealing the space inside the pump chamber. At the same time, impurities such as abrasive particles and dust drawn into the pump chamber are discharged from the pump chamber in a timely manner during the continuous circulation of lubricating oil.

[0016] This utility model uses a separate oil tank, which allows the continuously discharged lubricating oil containing abrasive particles, dust and other impurities to enter the oil tank for filtration and sedimentation, thereby making the lubricating oil that can be reused clean. The oil tank also serves as a collector for abrasive particles, dust and impurities, making it very convenient for users to clean and replace.

[0017] In this invention, external gas enters the pump body through the air inlet, and the first vacuum component begins to compress the gas to produce a preliminary vacuum effect. The gas then enters the second sub-pump chamber through a two-stage connector, where it is further compressed until the required low vacuum level is reached. This process can produce a greater vacuum level and is more efficient.

[0018] Other beneficial effects of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is an exploded view of the overall structure of this utility model;

[0021] Figure 3 This is a cross-sectional view of the main body of this utility model;

[0022] Figure 4 This is a schematic diagram of a two-stage communicating vessel of this utility model;

[0023] Figure 5 This is a schematic diagram of the installation of the one-way valve plate of this utility model.

[0024] [Explanation of Labels in the Attached Image]

[0025] 10-Frame; 20-Body; 21-Inlet; 22-Exhaust port; 23-First sub-pump chamber; 24-Second sub-pump chamber; 30-First vacuum assembly; 31-First end cover; 32-First rotor; 33-First vane; 34-First sealing ring; 35-Sealing ring retainer; 36 / 45-Spring rod; 40-Second vacuum assembly; 41-Second end cover; 42-Second rotor; 43-Second vane; 44-First... Two sealing rings; 50-Two-stage connector; 51-Connecting seat; 52-First channel; 53-Second channel; 54-First check valve plate; 55-Second check valve plate; 56-Connecting cavity; 60-Rotating assembly; 61-Rotating shaft; 62-Motor; 63-Drive wheel; 64-Driven wheel; 65-Transmission belt; 66-Bearing; 70-Lubricating oil circulation assembly; 71-Oil tank; 72-Oil inlet pipe; 73-Oil outlet pipe. Detailed Implementation

[0026] To make the technical problems, solutions, and advantages of this utility model clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figures 1-3 As shown, an embodiment of this utility model provides a bottom-discharge circulating self-cleaning rotary vane vacuum pump, including a frame 10, a body 20, a first vacuum assembly 30, a second vacuum assembly 40, a two-stage connector 50, a rotating assembly 60, and a lubricating oil circulation assembly 70. The frame 10 serves as the supporting structure for the entire device, providing a stable mounting platform for the other components. The body 20, as the main body of the device, is provided with pump chambers. The body shown in the figure is generally cylindrical, with two sub-pump chambers located at two positions on the body 20. The first vacuum assembly 30 and the second vacuum assembly 40 are respectively disposed in the two sub-pump chambers to form a two-stage vacuum effect. It also includes an inlet 21 for gas to enter the body 20 and an outlet 22 for gas to exit the body 20. Based on the two-stage vacuum effect, the gas entering from the inlet 21 first enters the sub-pump chamber containing the first vacuum component 30 (hereinafter referred to as the first sub-pump chamber 23), then enters the sub-pump chamber containing the second vacuum component 40 (hereinafter referred to as the second sub-pump chamber 24), and finally exits from the exhaust port 22. The two-stage connector 50 is used to connect the first sub-pump chamber 23 and the second sub-pump chamber 24 to allow gas flow.

[0030] In this embodiment, the first vacuum assembly 30 includes a first end cap 31, a first rotor 32, a first vane 33, and a first sealing ring 34. The first end cap 31 is installed and covers the first sub-pump chamber 23. The first end cap 31 has a central hole for the rotating assembly 60 to enter and transmit rotational motion. The first end cap 31 is detachable to facilitate replacement and maintenance of other components of the first vacuum assembly 30. The first rotor 32 is rotatably positioned along the central axis of the first sub-pump chamber 23. The first vane 33 is connected to the first rotor 32 and rotates synchronously with it. The first sealing ring 34 is located at the central hole of the first end cap 31 to significantly improve the sealing effect of the first sub-pump chamber 23 while the rotating assembly 60 transmits power to it, ensuring the generated vacuum effect. Considering practical installation, the first sealing ring 34 is located on the outside of the first sub-pump chamber 23. For ease of installation, the first vacuum assembly 30 in this embodiment also includes a sealing ring retainer 35, which is installed at the center hole of the first end cover 31 to press and fix the first sealing ring 34, thereby ensuring the sealing effect of the first sealing ring 34.

[0031] In this embodiment, the second vacuum assembly 40 includes a second end cap 41, a second rotor 42, a second vane 43, and a second sealing ring 44. The second end cap 41 is installed and covers the second sub-pump chamber 24, and does not have a central hole. The second end cap 41 is also detachable to facilitate replacement and maintenance of other components of the second vacuum assembly 40. The second rotor 42 is rotatably positioned along the central axis of the second sub-pump chamber 24, and the second vane 43 is connected to and rotates synchronously with the second rotor 42. The second sealing ring 44 is positioned in the second sub-pump chamber 24 at the entry point of the rotating assembly 60, significantly improving the sealing effect of the second sub-pump chamber 24 while the rotating assembly 60 moves into it, thus ensuring the generated vacuum effect.

[0032] It should be noted that the first sealing ring 34 and the second sealing ring 44 are both fluororubber lip seals. As standard rotary seals, they can ensure the sealing of the first sub-pump chamber 22 and the second sub-pump chamber 23 while rotating.

[0033] In a preferred embodiment, the first vane 33 is connected to the first rotor 32, and the second vane 43 is connected to the second rotor 42, both via multiple spring rods 36 / 45 (connecting rods and sleeved springs). Correspondingly, the first rotor 32, the first vane 33, the second rotor 42, and the second vane 43 have multiple connecting holes for inserting the spring rods 36 / 45. Simultaneously, the first rotor 32 and the second rotor 42 also have slots for inserting the first vane 33 and the second vane 34, respectively, so that the first vane 33 and the second vane 34 are also guided by the slots. Through the action of the spring rods 36 / 45, the first vane 33 and the first rotor 32, and the second vane 43 and the second rotor 42, are elastically connected, thus allowing the first vane 33 and the second vane 43 to maintain contact and seal with the corresponding sub-pump chamber inner wall by relying on elastic force.

[0034] At the same time, such as Figure 4 , Figure 5 As shown in this embodiment, the two-stage communication device 50 includes a communication seat 51, a first channel 52 and a second channel 53 formed on the communication seat 51, and a first one-way valve plate 54 and a second one-way valve plate 55. The communication seat 51 contains a communication cavity 56, with an exhaust port 22 communicating with the communication cavity 56 and an inlet port 21 communicating with the first sub-pump cavity 23. Under the action of the first vacuum assembly 30, gas enters the first sub-pump cavity 23 from the inlet port 21. The first sub-pump cavity 23 communicates with the first channel 52, and the first channel 52 communicates with the second sub-pump cavity 24. Simultaneously, a first one-way valve plate 54 is positioned at a corresponding position in the first channel 52, corresponding to the communication cavity 56. This allows gas, liquid, etc., in the first channel 52 to enter the communication cavity 56 when the first one-way valve plate 54 is open, but prevents flow in the reverse direction. The second sub-pump chamber 24 is connected to the second channel 53, and the second channel 53 is connected to the connecting chamber 56. At the same time, a second one-way valve plate 55 is provided at the corresponding position of the second channel 53 so that gas, liquid, etc. in the second sub-pump chamber 24 can enter the connecting chamber 51, and cannot be connected in the opposite direction.

[0035] Therefore, the two-stage connector 50 ensures that the gas flows along a preset path, achieving two-stage gas compression. Because the first sub-pump chamber 23 has a larger volume, its exhaust velocity is significantly higher than that of the second sub-pump chamber 24 during the initial vacuuming process. Simultaneously with the opening of the second one-way valve 55, excess gas in the first sub-pump chamber 23 needs to be directly discharged from the first one-way valve 54 to the connecting chamber 56; that is, both the first and second one-way valves 54 and 55 open and exhaust simultaneously. After the vacuum level increases, due to insufficient gas volume, the first one-way valve 54 remains closed under pressure conversion, and all gas is discharged from the second one-way valve 55 to the connecting chamber 56, and then discharged through the exhaust port 22.

[0036] Further explanation is as follows: When the first rotor 32 drives the first vane 33 to rotate, it cooperates with the sealing mechanism of the first sub-pump chamber 23 to complete the suction and exhaust movements. When the second rotor 42 drives the second vane 43 to rotate, it cooperates with the sealing mechanism of the second sub-pump chamber 24 to complete the suction and exhaust movements. When the first sub-pump chamber 23 draws in the working environment gas through the air inlet 21, the gas is compressed and discharged into the first channel 52 through a local volume change in the first sub-pump chamber 23. If the compressed gas does not have the ability to open the first one-way valve plate 54, the compressed gas will enter the second sub-pump chamber 24, where it will then draw in the gas again, be further compressed, open the second one-way valve plate 55, enter the connecting chamber 56, and then be discharged into the atmosphere. If the compressed gas in the first channel 52 has the ability to open the first one-way valve plate 54, the compressed gas will directly enter the connecting chamber 56 and then be discharged into the atmosphere. Therefore, a two-stage suction and exhaust cycle can be completed.

[0037] In this embodiment, the rotating assembly 60 includes a rotating shaft 61, a motor 62, a drive wheel 63, a driven wheel 64, a transmission belt 65, and bearings 66. The rotating shaft 61 drives the first rotor 32 and the second rotor 42 to rotate. The rotating shaft 61 extends into the interior of the first sub-pump chamber 23 and the second sub-pump chamber 24, and is connected to the first rotor 32 and the second rotor 42 to maintain synchronous rotation. This connection can be achieved using a key or integral connection. Due to the large length of the rotating shaft 61, bearings 66 provide rotational support to improve rotational stability. For example, in this embodiment, considering the large axial length of the first sub-pump chamber 23 and ease of installation, bearings 66 are respectively installed at both ends of the first sub-pump chamber 23 to ensure smooth rotation and transmission of the rotating shaft 61. The second end of the rotating shaft 61 is located inside the second sub-pump chamber 24, and the first end of the rotating shaft 61 extends outside the first sub-pump chamber 23. The driven wheel 64 is connected to the first end of the rotating shaft 61 and maintains synchronous rotation via a key or similar means. The motor 62 is mounted on the frame 10, and the drive wheel 63 is connected to the output end of the motor 62, maintaining synchronous rotation through a key or other means. The transmission belt 65 is sleeved between the drive wheel 63 and the driven wheel 64, so that the motor 62 can drive the rotating shaft 61 to rotate, thereby driving the first rotor 32 and the second rotor 42 to rotate.

[0038] In this embodiment, the lubricating oil circulation assembly 70 includes an oil tank 71, an oil inlet pipe 72, and an oil outlet pipe 73. The oil tank 71 is externally mounted on one side of the frame 10 and is filled with lubricating oil. The oil tank 71 is connected to the first sub-pump chamber 23 and the second sub-pump chamber 24 via different oil inlet pipes 72, allowing lubricating oil to enter the first sub-pump chamber 23 and the second sub-pump chamber 24 to lubricate the first vacuum assembly 30 and the second vacuum assembly 40, respectively, ensuring smooth operation of the vanes and rotor and reducing wear. It is understood that since the first sub-pump chamber 23 and the second sub-pump chamber 24 can generate vacuum (negative pressure) through the first vacuum assembly 30 and the second vacuum assembly 40, respectively, the lubricating oil in the oil tank 71 can be automatically drawn into the corresponding sub-pump chambers, ensuring sufficient lubrication of the vanes and rotor.

[0039] Meanwhile, in this embodiment, the lubricating oil adopts a bottom discharge and recycling mode. Specifically, both the first sub-pump chamber 23 and the second sub-pump chamber 24 have discharge channels at the bottom. The discharge channel at the bottom of the first sub-pump chamber 23 directly connects to the first channel of the two-stage connector 50, and the discharge channel at the bottom of the second sub-pump chamber 24 directly connects to the second channel of the two-stage connector 50. Therefore, the lubricating oil inside can be discharged from the corresponding sub-pump chamber under the action of airflow. Correspondingly, the two-stage connector 50 is located below the body 10, and an oil drain port is opened at the bottom (lowest point) of the connecting cavity 56. The oil drain port is connected to the oil tank 71 through the oil drain pipe 73. Finally, the lubricating oil can flow into the connecting cavity 56 under the action of gravity, and then enter the oil tank 71 for collection along the oil drain pipe 73 under the action of gravity. When the lubricating oil in the oil tank 71 is stored to a certain amount, the first vacuum component 30 and the second vacuum component 40 work simultaneously to draw the lubricating oil from the oil tank 71 into the first sub-pump chamber 23 and the second sub-pump chamber 24, realizing the circulation of lubricating oil.

[0040] As mentioned in the background technology, during the operation of the vacuum pump, a large amount of high-hardness silicon carbide abrasive particles and dust, as well as other impurities, accumulate in the two sub-pump chambers. Lubricating oil can effectively clean and remove these impurities, reducing the wear on related components caused by their accumulation in the two sub-pump chambers. Additionally, a filter structure, such as a filter element and / or filter screen, can be installed in the oil tank 71 near the oil drain pipe 73 to filter impurities, ensuring that the lubricating oil recirculated into the pump chamber contains less impurities. Of course, impurities in the oil tank 71 will also accumulate at the bottom due to sedimentation, so the lubricating oil in the upper part contains even fewer impurities when drawn into the pump chamber. In this way, continuous circulation achieves the functions of impurity discharge, filtration, and separation within the pump chamber, achieving continuous self-cleaning.

[0041] When a work cycle is completed and maintenance, cleaning, and oil replacement are required, the oil tank 71 can be opened directly, allowing for quick and easy replacement of contaminated lubricating oil and filter components. As mentioned earlier, the first vacuum assembly 30 and the second vacuum assembly 40 are also easily accessible for maintenance. Therefore, the convenience and efficiency of periodic maintenance for the bottom-discharge circulating self-cleaning rotary vane vacuum pump are further improved.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A bottom-discharge circulating self-cleaning rotary vane vacuum pump, characterized in that, It includes a frame (10), a body (20), an air inlet (21), an exhaust outlet (22), a vacuum assembly, a communicating vessel, a rotating assembly (60), and a lubricating oil circulation assembly (70). The frame (10) is used to support the whole, the body (20) is provided with a pump chamber, the vacuum component is provided in the pump chamber to generate a vacuum effect, the bottom of the pump chamber is provided with a discharge channel so that the pump chamber is a bottom discharge structure, and the rotating component (60) is used to drive the vacuum component to rotate. The lubricating oil circulation assembly (70) includes an oil tank (71), an oil inlet pipe (72), and an oil outlet pipe (73) disposed outside the body (20). The oil tank (71) is filled with lubricating oil. The oil tank (71) is connected to the pump chamber through the oil inlet pipe (72). The vacuum assembly generates a vacuum to automatically draw the lubricating oil in the oil tank (71) into the pump chamber. The oil outlet pipe (73) is connected to the discharge channel of the pump chamber through the communicating vessel. The air inlet (21) is used for gas to enter the pump chamber. The exhaust port (22) is connected to the communicating vessel.

2. The bottom-discharge circulating self-cleaning rotary vane vacuum pump according to claim 1, characterized in that, A filter structure is provided inside the oil tank (71) near the oil drain pipe (73), and the filter structure is used to filter impurities.

3. The bottom-discharge circulating self-cleaning rotary vane vacuum pump according to claim 1, characterized in that, The pump chamber includes a first sub-pump chamber (23) and a second sub-pump chamber (24), the first sub-pump chamber (23) and the second sub-pump chamber (24) are connected by the communicating vessel, and the vacuum assembly includes a first vacuum assembly (30) and a second vacuum assembly (40), the first vacuum assembly (30) is disposed in the first sub-pump chamber (23) and the second vacuum assembly (40) is disposed in the second sub-pump chamber (24).

4. The bottom-discharge circulating self-cleaning rotary vane vacuum pump according to claim 3, characterized in that, The first vacuum assembly (30) includes a first end cap (31), a first rotor (32), a first vane (33), and a first sealing ring (34). The first end cap (31) is detachably connected to the first sub-pump chamber (23). The first end cap (31) has a central hole for the rotating assembly (60) to enter. The first rotor (32) is rotatably disposed in the first sub-pump chamber (23). The first vane (33) is connected to the first rotor (32) and rotates synchronously with the first rotor (32). The first sealing ring (34) is used to seal the position where the rotating assembly (60) enters the first sub-pump chamber (23).

5. The bottom-discharge circulating self-cleaning rotary vane vacuum pump according to claim 4, characterized in that, The first vacuum assembly (30) also includes a sealing ring retainer (35), which is installed at the center hole of the first end cap (31) to press and fix the first sealing ring (34).

6. The bottom-discharge circulating self-cleaning rotary vane vacuum pump according to claim 4, characterized in that, The second vacuum assembly (40) includes a second end cap (41), a second rotor (42), a second vane (43), and a second sealing ring (44). The second end cap (41) is detachably connected to the second sub-pump chamber (24). The second rotor (42) is rotatably disposed in the second sub-pump chamber (24). The second vane (43) is connected to the second rotor (42) and rotates synchronously with the second rotor (42). The second sealing ring (44) is used to seal the position where the rotating assembly (60) enters the second sub-pump chamber (24).

7. The bottom-discharge circulating self-cleaning rotary vane vacuum pump according to claim 3, characterized in that, The communicating vessel is a two-stage communicating vessel (50). The two-stage communicating vessel (50) includes a communicating seat (51), a first channel (52) and a second channel (53) opened on the communicating seat (51). A communicating cavity (56) is provided in the communicating seat (51). The exhaust port (22) is connected to the communicating cavity (56). The air inlet (21) is connected to the first sub-pump chamber (23). The exhaust channel of the first sub-pump chamber (23) is connected to the first channel (52). The first channel (52) is connected to the second sub-pump chamber (24). A first one-way valve plate (54) is provided at the corresponding position of a channel (52). When the first one-way valve plate (54) is opened, the first channel (52) can be connected to the connecting cavity (56) in one direction. The discharge channel of the second sub-pump cavity (24) is connected to the second channel (53). The second channel (53) is connected to the connecting cavity (56). A second one-way valve plate (55) is provided at the corresponding position of the second channel (53). When the second one-way valve plate (55) is opened, the second sub-pump cavity (24) can be connected to the connecting cavity (56) in one direction.

8. The bottom-discharge circulating self-cleaning rotary vane vacuum pump according to claim 6, characterized in that, The rotating assembly (60) includes a rotating shaft (61), a motor (62), a drive wheel (63), a driven wheel (64), a transmission belt (65), and a bearing (66). The rotating shaft (61) extends into the interior of the first sub-pump chamber (23) and the second sub-pump chamber (24) and is connected to the first rotor (32) and the second rotor (42) to maintain synchronous rotation. The bearing (66) is disposed in the first sub-pump chamber (23) and / or the second sub-pump chamber (24) to support the rotating shaft (61). The motor (62) is mounted on the frame (10). The drive wheel (63) is connected to the output end of the motor (62). The transmission belt (65) is sleeved between the drive wheel (63) and the driven wheel (64).

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