Rotary-vane vacuum pump

Abstract

The utility model belongs to the technical field of vacuum pumps, and particularly relates to a rotary-vane vacuum pump which comprises an oil tank shell, a pump body and a rotor. The pump body and the rotor are matched to achieve the air exhaust effect. An exhaust valve assembly is installed on the pump body, an exhaust connector is installed on the oil tank shell, and a small hole for assisting exhaust is formed in a valve plate in the middle of the exhaust connector. Due to the design of the exhaust joint, the noise during working is reduced; the exhaust valve assembly comprises a mounting bracket and a stainless steel elastic sheet; the stainless steel elastic sheet covers and seals the exhaust port; the exhaust port is sealed through the stainless steel elastic piece, the stainless steel elastic piece cannot be influenced by acidic, alkaline or oxidizing gas, and the service life of the vacuum pump is effectively guaranteed; the stroke of the stainless steel elastic piece is restrained through the positioning column, and sealing failure caused by excessive bending of the stainless steel elastic piece is avoided; meanwhile, the stainless steel elastic piece is pressed through the compression spring, and it is ensured that the stainless steel elastic piece can be stably sealed at the exhaust port.

Description

Technical Field

[0001] This patent application belongs to the field of vacuum pump technology, and specifically refers to a rotary vane vacuum pump. Background Technology

[0002] A rotary vane vacuum pump has a rotor eccentrically mounted inside the pump body. Two or more radial grooves are formed on the sidewall of the rotor, and vanes are installed within these grooves. The vanes slide within the grooves and contact the inner wall of the pump body, dividing the pump chamber into several variable volumes. This type of rotary positive displacement vacuum pump typically uses oil as a seal between the vanes and the pump chamber; therefore, rotary vane vacuum pumps are generally oil-sealed mechanical vacuum pumps.

[0003] CN202221720910.3 discloses an exhaust valve assembly for an oil rotary vane vacuum pump, including an exhaust valve core and an exhaust baffle. A compression spring is provided between the exhaust valve core and the exhaust baffle. A first support is formed on the top of the exhaust valve core, and a second support is fixedly connected to the bottom of the exhaust baffle. The two ends of the compression spring are respectively sleeved on the first support and the second support. A metal gasket is provided on the exhaust valve core. The material of the exhaust valve core is rubber.

[0004] In actual use, vacuum pumps are used to extract acidic, alkaline, or oxidizing gases, which makes it difficult to guarantee the service life of the rubber parts on the exhaust valve core. They may age in less than six months, causing the exhaust valve to malfunction and leading to the failure of the entire vacuum pump. Summary of the Invention

[0005] The purpose of this patent application is to provide a rotary vane vacuum pump with a long service life, low noise, and adaptability to pumping acidic, alkaline, or oxidizing gases.

[0006] The purpose of this patent application is achieved as follows:

[0007] A rotary vane vacuum pump, including

[0008] A pump assembly includes an oil tank housing, a pump body, and a rotor. The pump body has a cylindrical chamber inside, and the rotor is eccentrically positioned within the chamber. One or more radial grooves are radially arranged on the outer wall of the rotor, and vanes are installed within these grooves. A return spring abuts the inner end of each vane. Under the action of the return spring, the vanes are held to extend outwards, with their outer ends abutting against the inner wall of the chamber. The vanes divide the chamber into at least a first inner cavity and a second inner cavity. A first exhaust port and a first intake port are provided on the outer side of the pump body, and an exhaust valve assembly is provided at the first exhaust port. The oil tank housing is fitted onto the outer side of the pump body, and a second exhaust port is provided on the oil tank housing, communicating with the first exhaust port. An exhaust connector is installed at the second exhaust port.

[0009] An electric motor, which provides power to the rotor of the pump assembly;

[0010] A connecting base is disposed between the pump assembly and the motor; one side of the connecting base is connected to the motor, and the other side of the connecting base is connected to the pump body and oil tank housing of the pump assembly; the motor shaft of the motor passes through the connecting base and extends into the pump body to connect with the rotor; a pressure gauge and a second suction port are provided on the connecting base; the second suction port is in communication with the inner cavity of the first suction port of the pump body; the pressure gauge is in communication with the second suction port;

[0011] The exhaust connector has a circular vent hole in the middle, and a supporting inner wall in the middle of the vent hole. A valve core assembly is located at the vent hole. The valve core assembly includes a valve plate, a guide rod, and a limiting bracket. The valve plate is located outside the vent hole, and its outer diameter is larger than the inner diameter of the supporting inner wall. The guide rod connects the valve plate and the limiting bracket. The limiting bracket is located inside the vent hole, and its outer diameter is larger than the inner diameter of the supporting inner wall, and it is used to prevent the valve plate from disengaging from the vent hole. The valve plate has a small hole for assisting exhaust.

[0012] Preferably, the limiting frame has several through holes around its periphery and a guide hole in the middle of the limiting frame; the guide rod passes through the guide hole, the upper end of the guide rod is connected to a valve plate, and the lower end of the guide rod is connected to a locking nut.

[0013] Preferably, the connecting base is provided with a first airflow channel and a second airflow channel. One end of the first airflow channel extends to the second air intake, and the other end of the first airflow channel is connected to the first air intake. The inner end of the second airflow channel is connected to the middle of the first airflow channel, and the outer end of the second airflow channel extends to the side wall of the front part of the connecting base. The pressure gauge is provided on the side wall and is connected to the outer end of the second airflow channel.

[0014] Preferably, the exhaust valve assembly includes

[0015] The mounting bracket is located on one side of the exhaust port; the mounting bracket includes a base and a crossbeam, the base being fixed to the pump body; the crossbeam is fixed to the base and extends above the exhaust port;

[0016] The stainless steel spring has a fixed end and a movable end. The fixed end of the stainless steel spring is installed on the pump body or on the mounting bracket, and the movable end of the stainless steel spring is located on the lower side of the crossbeam and on the upper side of the exhaust port. The movable end of the stainless steel spring covers and closes the exhaust port. When the gas inside the pump body is discharged outward through the exhaust port, the movable end of the stainless steel spring is pushed open by the air inside the pump body.

[0017] A positioning column is installed on the crossbeam; a positioning end is formed on the lower side of the positioning column, and the positioning end extends toward the stainless steel spring; a certain distance is formed between the positioning end and the stainless steel spring, and when the stainless steel spring is deformed upward by the gas inside the pump body, the positioning end constrains the maximum deformation position of the stainless steel spring.

[0018] A compression spring is located between the mounting bracket and the stainless steel spring; one end of the compression spring abuts against the mounting bracket, and the other end abuts against the stainless steel spring; the compression spring maintains the tendency to press the stainless steel spring against the exhaust port.

[0019] Preferably, the base and crossbeam of the mounting bracket are either an integral structure or a separate structure.

[0020] Preferably, the positioning post is a bolt, which is screwed onto the crossbeam of the mounting bracket from bottom to top.

[0021] Preferably, the compression spring is sleeved on the positioning post, and the inner diameter of the compression spring is larger than the outer diameter of the positioning post.

[0022] Preferably, the stainless steel spring is elongated, with a length of 30-40 mm, a width of 15-20 mm, and a thickness of 0.1-0.3 mm.

[0023] Preferably, the distance between the lower end of the positioning post and the stainless steel spring is 4mm to 6mm.

[0024] The outstanding and beneficial technical effects of this patent application compared to the prior art are:

[0025] 1. The rotary vane vacuum pump of this patent features low noise and easy maintenance. Air discharged from the exhaust port passes through the exhaust valve assembly and then through the exhaust connector to the external environment. The design of the exhaust valve assembly and exhaust connector results in low noise during operation. When the exhaust port pressure is low, the gas can be discharged through the auxiliary exhaust port without needing to lift the valve core, further reducing noise. When the exhaust port pressure is high, the valve vane is lifted as a whole, allowing for rapid gas discharge. The valve vane design also prevents dust from the external environment from entering the pump body, ensuring its service life.

[0026] 2. This patent uses a stainless steel spring to seal the exhaust port. The stainless steel spring is not affected by acidic, alkaline or oxidizing gases, effectively ensuring the service life of the vacuum pump. The stroke of the stainless steel spring is constrained by the positioning column to prevent the stainless steel spring from bending too much and causing the seal to fail. At the same time, the stainless steel spring is compressed by the compression spring to ensure that the stainless steel spring can be stably sealed at the exhaust port.

[0027] 3. The pressure gauge of this patent is located on the front side of the connecting base, which makes it easy to observe the working pressure and convenient to use. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the present invention.

[0029] Figure 2 This is a schematic diagram of the pump body part of this utility model.

[0030] Figure 3 This is a schematic diagram of the fit between the pump body and the rotor of this utility model.

[0031] Figure 4 This is a schematic diagram of the exhaust connector of this utility model.

[0032] Figure 5 This is a simplified diagram of the internal structure of the exhaust connector of this utility model.

[0033] Figure 6 This is a schematic diagram of the exhaust valve assembly of this utility model. Detailed Implementation

[0034] This patent application will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figures 1-6 :

[0035] A rotary vane vacuum pump, including

[0036] Pump assembly 3 includes an oil tank housing 30, a pump body 32, and a rotor 34. The pump body 32 has a cylindrical chamber 321 inside. The rotor is eccentrically disposed within the chamber of the pump body. One or more radial grooves are radially arranged on the outer wall of the rotor, and vanes 322 are installed within these radial grooves. A return spring abuts the inner end of each vane. Under the action of the return spring, the vanes are kept extended outwards, with their outer ends abutting against the inner wall of the chamber 321. The vanes 322 divide the chamber into at least a first inner cavity 3211 and a second inner cavity 3211. The pump body has two inner cavities 3212. The first inner cavity 3211 and the second inner cavity 3212 will form changing volumes during rotor rotation, thereby achieving exhaust and intake. A first exhaust port 335 and a first intake port 381 are provided on the outside of the pump body. An exhaust valve assembly 33 is provided at the first exhaust port 335. When the volume inside the first inner cavity 3211 and the second inner cavity 3212 decreases, gas exits from the exhaust port. When the volume of the first inner cavity 3211 and the second inner cavity 3212 increases, a stainless steel spring seals the exhaust port, allowing gas to enter from the first intake port 381. The oil tank housing 30 is fitted onto the outside of the pump body. A second exhaust port 301 is provided on the oil tank housing 30, which is connected to the first exhaust port 335. An exhaust connector 31 is installed at the second exhaust port 301.

[0037] An external vent 5 is installed on the pump casing 6, which serves to both vent air and block dust. A pressure gauge 12 is installed on the front side of the intermediate seat 1.

[0038] Motor 1, which provides power to the rotor 34 of the pump assembly;

[0039] A connecting base 2 is disposed between the pump assembly 3 and the motor 1; one side of the connecting base 2 is connected to the motor, and the other side of the connecting base 2 is connected to the pump body 32 and the oil tank housing 30 of the pump assembly; the motor shaft of the motor passes through the connecting base 2 and extends into the pump body to connect with the rotor 34; a pressure gauge 22 and a second suction port 21 are provided on the connecting base; the second suction port 21 is in communication with the inner cavity of the first suction port 381 of the pump body; the pressure gauge 22 is in communication with the second suction port 21;

[0040] The exhaust connector 31 has a circular vent hole 390 in its center, and a supporting inner wall 391 in the center of the vent hole 390. A valve core assembly is located at the vent hole. The valve core assembly includes a valve plate 312, a guide rod 318, and a limiting frame 314. The valve plate 312 is located outside the vent hole, and its outer diameter is larger than the inner diameter of the supporting inner wall 391. The guide rod 318 connects the valve plate 312 and the limiting frame 314. The limiting frame 314 is located inside the vent hole, and its outer diameter is larger than the inner diameter of the supporting inner wall 391, preventing the valve plate from disengaging from the vent hole. The valve plate 312 has a small hole 313 for auxiliary exhaust. When the exhaust pressure is low, the gas can be discharged through the auxiliary exhaust hole without lifting the valve core, resulting in less noise. When the exhaust pressure is high, the valve plate is lifted as a whole, allowing for rapid gas discharge. The valve plate design also makes it difficult for dust from the external environment to enter the pump body, reducing noise and ensuring service life.

[0041] Preferably, the limiting frame has several through holes 3141 around its periphery and a guide hole in the middle of the limiting frame; the guide rod passes through the guide hole, the upper end of the guide rod is connected to a valve plate 312, and the lower end of the guide rod is connected to a locking nut 317.

[0042] Preferably, the connecting base 2 is provided with a first airflow channel 211 and a second airflow channel 212. One end of the first airflow channel 211 extends to the second air intake 21, and the other end of the first airflow channel 211 is connected to the first air intake 381. The inner end of the second airflow channel 212 is connected to the middle of the first airflow channel 211, and the outer end of the second airflow channel 212 extends to the side wall of the front part of the connecting base. The pressure gauge 22 is provided on the side wall and is connected to the outer end of the second airflow channel 212.

[0043] Preferably, the exhaust valve assembly 33 includes

[0044] Mounting bracket 330 is disposed on one side of exhaust port 335; the mounting bracket includes a base 332 and a crossbeam 331, the base being fixed to the pump body 32; the crossbeam 331 is fixed to the base 332 and extends above the exhaust port 335;

[0045] A stainless steel spring 333 has a fixed end 3331 and a movable end 3332. The fixed end of the stainless steel spring is mounted on the pump body or a mounting bracket, while the movable end is located below the crossbeam and above the exhaust port. The movable end 3332 covers and seals the exhaust port 335. When gas inside the pump body is discharged through the exhaust port, the movable end of the stainless steel spring is pushed open by the air inside the pump body. The stainless steel spring has excellent corrosion resistance and is suitable for vacuuming acidic or alkaline gases. The exhaust port is sealed by the stainless steel spring, and since the pump body at the exhaust port is flat, the stainless steel spring fits well against this flat surface and seals the exhaust port.

[0046] A positioning post 336 is installed on the crossbeam. A positioning end 3361 is formed on the lower side of the positioning post, extending towards the stainless steel spring. A certain distance is formed between the positioning end and the stainless steel spring. When the stainless steel spring 333 deforms upward under the action of gas inside the pump body, the positioning end constrains the maximum deformation position of the stainless steel spring. The positioning end 331 can prevent excessive deformation of the stainless steel spring. If the stainless steel spring is excessively bent, it may cause creases in the stainless steel spring, which weakens the sealing effect.

[0047] A compression spring 334 is located between the mounting bracket and the stainless steel spring sheet; one end of the compression spring abuts against the mounting bracket and the other end abuts against the stainless steel spring sheet; the compression spring 334 maintains the tendency to press the stainless steel spring sheet 333 against the exhaust port 335.

[0048] Preferably, the base 332 and the crossbeam 331 of the mounting bracket are either an integral structure or a separate structure. The mounting bracket is screwed onto the pump body 2 as a whole using screws; the stainless steel spring is also screwed onto the pump body 2 together.

[0049] Preferably, the positioning post 336 is a bolt, which is screwed onto the crossbeam of the mounting bracket from bottom to top. The bolt design allows for very convenient up-and-down fine-tuning, ensuring that the travel of the stainless steel sheet is within a good range. When it is necessary to reduce the travel of the stainless steel sheet, simply pull the bolt down partially.

[0050] Preferably, the compression spring 334 is sleeved on the positioning post 336, and the inner diameter of the compression spring is larger than the outer diameter of the positioning post. After a period of use, the stainless steel spring sheet may also experience fatigue, leading to a weakening of the elastic restoring effect; the compression spring design ensures that the stainless steel spring sheet remains pressed tightly against the exhaust port, improving the stability of the seal.

[0051] Preferably, the stainless steel spring 333 is elongated, with a length of 30-40 mm, a width of 15-20 mm, and a thickness of 0.1-0.3 mm. The size of the stainless steel spring is adapted to the exhaust port, and its thickness should not be too thin or too thick.

[0052] Preferably, the distance between the lower end of the positioning post 336 and the stainless steel spring 333 is 4mm to 6mm. This distance should not be too close or too far; if it is too close, it will cause difficulty in venting; if it is too far, it will cause the stainless steel spring to fatigue easily.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of this patent application. Those skilled in the art should understand that this patent application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this patent application. Various changes and modifications can be made to this patent application without departing from its spirit and scope, and all such changes and modifications fall within the scope of this patent application as claimed. The scope of protection of this patent application is defined by the appended claims and their equivalents.

Claims

1. A rotary vane vacuum pump, characterized in that The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34).

2. A rotary vane vacuum pump according to claim 1, characterized in that The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly (3) and a motor (1) and a connecting base (2) are connected, and the motor (1) is used to provide power to the pump assembly (3) of the rotor (34). The utility model relates to a pump assembly 3. A rotary vane vacuum pump according to claim 1, characterized in that The connecting base (2) is provided with a first airflow channel (211) and a second airflow channel (212). One end of the first airflow channel (211) extends to the second air intake (21), and the other end of the first airflow channel (211) is connected to the first air intake (381). The inner end of the second airflow channel (212) is connected to the middle of the first airflow channel (211), and the outer end of the second airflow channel (212) extends to the side wall of the front part of the connecting base. The pressure gauge (22) is provided on the side wall, and the pressure gauge (22) is connected to the outer end of the second airflow channel (212).

4. A rotary vane vacuum pump according to claim 1, characterized in that The exhaust valve assembly (33) includes Mounting bracket (330) is provided on one side of exhaust port (335); the mounting bracket includes a base (332) and a crossbeam (331), the base being fixed to the pump body (32); the crossbeam (331) is fixed to the base (332) and extends above the exhaust port (335); A stainless steel spring (333) has a fixed end (3331) and a movable end (3332) at one end. The fixed end of the stainless steel spring is installed on the pump body or on the mounting bracket, and the movable end of the stainless steel spring is located on the lower side of the crossbeam and on the upper side of the exhaust port. The movable end (3332) of the stainless steel spring covers and closes the exhaust port (335). When the gas inside the pump body is discharged outward through the exhaust port, the movable end of the stainless steel spring is pushed open by the air inside the pump body. A positioning column (336) is installed on the crossbeam; a positioning end (3361) is formed on the lower side of the positioning column, and the positioning end extends toward the stainless steel spring; a certain distance is formed between the positioning end and the stainless steel spring, and when the stainless steel spring (333) is deformed upward by the gas inside the pump body, the positioning end constrains the maximum deformation position of the stainless steel spring. A compression spring (334) is located between the mounting bracket and the stainless steel spring; one end of the compression spring abuts against the mounting bracket and the other end abuts against the stainless steel spring; the compression spring (334) maintains the tendency to press the stainless steel spring (333) against the exhaust port (335).

5. A rotary vane vacuum pump according to claim 4, characterized in that: The base (332) and the crossbeam (331) of the mounting bracket are either an integral structure or a separate structure.

6. A rotary vane vacuum pump according to claim 4, characterised in that: The positioning post (336) is a bolt, which is screwed onto the crossbeam of the mounting bracket from bottom to top.

7. A rotary vane vacuum pump according to claim 4, characterised in that: The compression spring (334) is sleeved on the positioning post (336), and the inner diameter of the compression spring is larger than the outer diameter of the positioning post.

8. A rotary vane vacuum pump according to claim 4, characterized in that: The stainless steel spring (333) is long and narrow, with a length of 30-40 mm, a width of 15-20 mm, and a thickness of 0.1-0.3 mm.

9. A rotary vane vacuum pump according to claim 8, characterised in that: The distance between the lower end of the positioning post (336) and the stainless steel spring (333) is 4mm to 6mm.

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