Exhaust valve assembly of rotary-vane vacuum pump

Abstract

The utility model belongs to the technical field of rotary-vane vacuum pumps, and particularly relates to an exhaust valve assembly of a rotary-vane vacuum pump, which comprises a mounting bracket and a stainless steel elastic sheet, the stainless steel elastic sheet covers and seals the exhaust port; when air in the pump body is exhausted outwards through the exhaust port, the movable end of the stainless steel elastic piece is jacked open by the air in the pump body. The positioning column is installed on the installation support, and when the stainless steel elastic piece deforms upwards under the action of gas in the pump body, the positioning column restrains the maximum deformation position of the stainless steel elastic piece. 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 rotary vane vacuum pump technology, and specifically refers to an exhaust valve assembly for 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 an exhaust valve assembly for a rotary vane vacuum pump with a long service life that can be adapted to extracting acidic, alkaline, or oxidizing gases.

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

[0007] An exhaust valve assembly for a rotary vane vacuum pump is installed at the exhaust port of the pump body, including...

[0008] 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;

[0009] 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.

[0010] 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.

[0011] 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.

[0012] Preferably, the base and crossbeam of the mounting bracket are either an integral structure or a separate structure.

[0013] Preferably, the positioning post is a bolt, which is screwed onto the crossbeam of the mounting bracket from bottom to top.

[0014] 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.

[0015] Preferably, the stainless steel spring is elongated, with a length of 36mm, a width of 18mm, and a thickness of 0.1-0.3mm.

[0016] Preferably, the distance between the lower end of the positioning post and the stainless steel spring is 4mm to 6mm.

[0017] The outstanding and beneficial technical effects of this patent application compared to the prior art are:

[0018] 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 a compression spring to ensure that the stainless steel spring can be stably sealed at the exhaust port. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the exhaust valve assembly of the vacuum pump of this utility model installed on the pump body.

[0020] Figure 2 This is one of the schematic diagrams of the exhaust valve assembly of the vacuum pump of this utility model.

[0021] Figure 3 This is the second schematic diagram of the exhaust valve assembly of the vacuum pump of this utility model.

[0022] Figure 4This is a schematic diagram of a vacuum pump equipped with this utility model. Detailed Implementation

[0023] This patent application will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figures 1-4 :

[0024] An exhaust valve assembly for a rotary vane vacuum pump is installed at the exhaust port 20 of the pump body 2, including...

[0025] Mounting bracket 30 is disposed on one side of exhaust port 20; the mounting bracket 30 includes a base 32 and a crossbeam 31, the base 32 is fixed to the pump body 2; the crossbeam 31 is fixed to the base 32 and extends above the exhaust port 20;

[0026] A stainless steel spring 35 has a fixed end 351 and a movable end 352. The fixed end 351 of the stainless steel spring is mounted on the pump body 2 or a mounting bracket, and the movable end 352 is located below the crossbeam 31 and above the exhaust port 20. The movable end 352 covers and seals the exhaust port 20. When gas inside the pump body 2 is discharged through the exhaust port 20, the movable end 352 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 can fit well against this flat surface and seal the exhaust port.

[0027] A positioning post 33 is installed on the crossbeam 31. A positioning end 331 is formed on the lower side of the positioning post 33, extending towards the stainless steel spring 35. A certain distance is formed between the positioning end and the stainless steel spring. When the stainless steel spring deforms upward under the action of gas inside the pump body, the positioning end 331 constrains the maximum deformation position of the stainless steel spring 35. 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.

[0028] A compression spring 34 is located between the mounting bracket 30 and the stainless steel spring 35. One end of the compression spring 34 abuts against the mounting bracket 30, and the other end abuts against the stainless steel spring. The compression spring 34 maintains the tendency to press the stainless steel spring 35 against the exhaust port 20. After a period of use, the stainless steel spring may also experience fatigue, leading to a weakening of the elastic restoring effect. The compression spring design ensures that the stainless steel spring remains pressed against the exhaust port, improving the stability of the seal.

[0029] Preferably, the base 31 and the crossbeam 32 of the mounting bracket 30 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.

[0030] Preferably, the positioning post 33 is a bolt, which is screwed onto the crossbeam portion 31 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.

[0031] Preferably, the compression spring 34 is sleeved on the positioning post 33, and the inner diameter of the compression spring is larger than the outer diameter of the positioning post. When the stainless steel spring sheet fatigues due to prolonged use, the compression spring ensures that the stainless steel spring sheet remains pressed firmly against the exhaust port.

[0032] Preferably, the stainless steel spring 35 is elongated, with a length of 36mm, a width of 18mm, and a thickness of 0.1-0.3mm. The size of the stainless steel spring is adapted to the exhaust port, and its thickness should not be too thin or too thick.

[0033] Preferably, the distance between the positioning end 331 of the positioning post 33 and the stainless steel spring 35 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.

[0034] The rotary vane vacuum pump includes an intermediate base 1, a motor 7 on one side, and a pump assembly 4 on the other side. The pump assembly 4 contains a pump body 2 with a cylindrical chamber inside. An end cover 21 is installed at the front of the pump body 2. A rotor 22 is installed inside the chamber, eccentrically positioned relative to the pump body chamber. Two vanes 23 are located on the side of the rotor, with their outer ends always in close contact with the pump body chamber. The vanes divide the pump body chamber into two sub-chambers, whose volumes change during rotor rotation, thus achieving exhaust and intake. The rotor chamber is connected to an exhaust port 20. When the volume of a sub-chamber decreases, gas exits from the exhaust port; when the volume of a sub-chamber increases, a stainless steel spring seals the exhaust port, allowing gas to enter through the intake port 11. An external exhaust port 5 is installed on the oil tank 6, serving both exhaust and dust protection purposes. A pressure gauge 12 is located at the front of the intermediate base 1.

[0035] 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. An exhaust valve assembly for a rotary vane vacuum pump, installed at the exhaust port (20) of the pump body (2), characterized in that, include Mounting bracket (30) is provided on one side of exhaust port (20); the mounting bracket (30) includes a base (32) and a crossbeam (31), the base (32) is fixed on the pump body (2); the crossbeam (31) is fixed on the base (32) and extends above the exhaust port (20); A stainless steel spring (35) has a fixed end (351) and a movable end (352) at one end. The fixed end (351) of the stainless steel spring is installed on the pump body (2) or on the mounting bracket. The movable end (352) of the stainless steel spring is located on the lower side of the crossbeam (31) and on the upper side of the exhaust port (20). The movable end (352) of the stainless steel spring covers and closes the exhaust port (20). When the gas inside the pump body (2) is discharged outward through the exhaust port (20), the movable end (352) of the stainless steel spring is pushed open by the air inside the pump body. A positioning column (33) is installed on the crossbeam (31); a positioning end (331) is formed on the lower side of the positioning column (33), and the positioning end extends toward the stainless steel spring (35); 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 (331) constrains the maximum deformation position of the stainless steel spring (35). A compression spring (34) is located between the mounting bracket (30) and the stainless steel spring (35); one end of the compression spring (34) abuts against the mounting bracket (30) and the other end abuts against the stainless steel spring; the compression spring (34) maintains the tendency to press the stainless steel spring (35) against the exhaust port (20).

2. The exhaust valve assembly of a rotary vane vacuum pump according to claim 1, characterized in that: The base (32) and the crossbeam (31) of the mounting bracket (30) are either an integral structure or a separate structure.

3. The exhaust valve assembly of a rotary vane vacuum pump according to claim 1, characterized in that: The positioning post (33) is a bolt, which is screwed onto the crossbeam (31) of the mounting bracket from bottom to top.

4. The exhaust valve assembly of a rotary vane vacuum pump according to claim 1, characterized in that: The compression spring (34) is sleeved on the positioning post (33), and the inner diameter of the compression spring is larger than the outer diameter of the positioning post.

5. The exhaust valve assembly of a rotary vane vacuum pump according to claim 1, characterized in that: The stainless steel spring (35) is elongated, with a length of 36 mm, a width of 18 mm, and a thickness of 0.1 to 0.3 mm.

6. The exhaust valve assembly of a rotary vane vacuum pump according to claim 5, characterized in that: The distance between the positioning end (331) of the positioning post (33) and the stainless steel spring (35) is 4mm to 6mm.

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