A slide valve vacuum pump

Abstract

The present invention provides a sliding valve vacuum pump, which belongs to the technical field of vacuum pumps. It solves the problems that the filter screen of the existing oil mist filter element has poor oil and gas filtering effect, poor oil and gas separation effect, and is inconvenient to use. The sliding valve vacuum pump includes a pump body with a pump cavity inside, an exhaust valve is arranged on the pump cavity, an exhaust port is arranged on the opposite side wall of the pump body, and an oil and gas filter is detachably fixedly connected to the exhaust port. A flow deceleration mechanism is arranged between the exhaust valve and the oil and gas filter, including an exhaust oil pool and a buffer oil pool arranged upward at the upper end of the outer wall of the pump cavity, and the exhaust valve is vertically assembled on the pump cavity wall in the exhaust oil pool. The exhaust valve is immersed in the oil in the exhaust oil pool for the immersion gear of the oil and gas flow, and a gear device is arranged on the inner wall of the pump body between the exhaust oil pool and the buffer oil pool. The present invention can improve the separation and filtration effect of oil and gas, has good structural stability, is easy to manufacture, and is easy to use.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum pumps and relates to a sliding valve vacuum pump. Background Art

[0002] Sliding valve vacuum pump is the abbreviation of sliding valve oil-sealed mechanical pump. It is a variable volume gas transmission pump with the advantages of significant energy saving effect, high vacuum degree, large air extraction volume in high vacuum range, etc.

[0003] The existing sliding valve vacuum pumps on the market have a structure with a built-in oil and gas filter, such as the sliding valve vacuum pump described in the Chinese patent with the patent number of "201820498435.7" and the authorization announcement number of "CN208057410U", whose specific structure includes a pump body, a box for storing oil liquid is arranged on the pump body, an oil and gas separator is arranged in the box, the air outlet channel of the pump body is connected to the oil and gas separator, and the box is provided with a partition, which divides the box into an upper chamber and a lower chamber, and the partition is opened. A connecting hole is provided, an exhaust port is provided in the upper chamber, and an oil mist filter is built in, the oil mist filter is distributed on the connecting hole, and an oil-gas separator is provided in the lower chamber; the oil-gas separator includes an air intake hood with an air intake port facing downward, an air outlet is provided laterally of the air intake hood, an oil baffle is installed on the top of the air intake hood, the oil baffle and the air intake hood divide the lower chamber into a left chamber and a right chamber, the air outlet is provided on the left chamber side, the connecting holes are distributed on the right chamber side, and an air flow channel connecting the left chamber and the right chamber is formed between the inner wall of the box on both sides of the air intake hood.

[0004] In the above structure, a partition is arranged in the pump body, and an upper chamber and a lower chamber are separated by the partition. An oil-gas separator is arranged in the lower chamber. The oil-gas separator is mainly composed of an air intake hood, and the air intake hood is arranged above the exhaust valve of the pump chamber in the pump body. Although the air intake hood can block the flow of oil and gas in the pump chamber in the pump body, the air intake hood has a limited effect of slowing down the flow speed of oil and gas, so that most of the oil and gas enter the oil mist filter element in the upper chamber. The oil mist filter element is a cylindrical single-layer filter element. More oil and gas enter the oil mist filter element, and the oil and gas easily clog the filter screen in the oil mist filter element, resulting in poor oil and gas filtering effect of the filter screen of the oil mist filter element, poor oil and gas separation effect, and inconvenient use. Summary of the invention

[0005] The purpose of the present invention is to provide a sliding valve vacuum pump with a simple structure, good oil and gas blocking effect in the pump body, and obvious oil and gas separation and oil and gas filtering effects in view of the above problems existing in the prior art.

[0006] The objective of the present invention can be achieved through the following technical scheme: a sliding valve vacuum pump, comprising a pump body with a pump cavity inside, an exhaust valve is arranged on the pump cavity, an exhaust port is arranged on the opposite side wall of the pump body away from the exhaust valve, an oil and gas filter is detachably connected to the exhaust port, and the characteristic is that a flow deceleration mechanism for slowing down the flow speed of oil and gas discharged from the exhaust valve is arranged between the exhaust valve and the oil and gas filter; the flow deceleration mechanism comprises an exhaust oil pool arranged upward at the upper end of the outer wall of the pump cavity and a buffer oil pool adjacent to the exhaust oil pool, the exhaust valve is vertically assembled on the pump cavity wall in the exhaust oil pool, the exhaust valve is immersed in the oil in the exhaust oil pool for the immersion gear of oil and gas flow, and a gear device for directing the oil and gas gear flow to the buffer oil pool and absorbing the oil through the oil surface of the buffer oil pool is arranged on the inner wall of the pump body between the exhaust oil pool and the buffer oil pool.

[0007] The main structure of this sliding valve vacuum pump is: built-in oil and gas filter; multiple structures to block the flow speed of oil and gas before the oil and gas in the pump body enter the oil and gas filter, and an oil baffle device and a buffer gear device are set; the flow speed of oil and gas has been greatly reduced when passing through the oil baffle device and the buffer gear device, and the oil and gas can achieve the best separation and filtration effect when entering the oil and gas filter for separation and filtration; the oil and gas filtration effect is good, the oil and gas separation effect is good, and it is easy to use. The structural design point of the oil baffle device is to immerse the exhaust valve in the oil in the exhaust oil pool, use oil as the sealing medium, and have a certain liquid level in the exhaust oil pool, which generates oil pressure to provide pre-tightening force for the exhaust valve to ensure the sealing effect; at the same time, it affects the reaction speed of the exhaust valve, and discharges through oil and gas overflow, which can effectively slow down the flow speed of oil and gas.

[0008] In the above-mentioned sliding valve vacuum pump, the shift device includes a baffle plate arranged vertically, the exhaust oil pool and the buffer oil pool are separated by a vertical partition plate, the baffle plate is fixed on the pump body above the buffer oil pool, the baffle plate extends downward into the buffer oil pool and separates the buffer oil pool to the left and right, the outer wall of the buffer oil pool has a horizontally arranged overflow hole, the overflow hole is arranged at a level lower than the level of the lower edge of the baffle plate, and a buffer device for oil filtering and oil and gas backflow to the buffer oil pool is arranged on the pump body between the exhaust oil pool and the buffer oil pool. The purpose of having a smaller distance between the two walls of the exhaust oil pool is to guide the oil and gas discharged from the horizontally moving exhaust valve to the vertically upward exhaust, so that the oil and gas are concentrated in the position directly above the exhaust oil pool, thereby increasing the oil reflux rate of the exhaust oil pool and ensuring the oil level in the exhaust oil pool when it is in balance; the exhaust oil pool is to ensure the oil height and generate appropriate oil pressure; the buffer oil pool is to ensure that there is oil to produce a buffering effect and to ensure that the oil level does not exceed the standard, to avoid increasing the oil and gas exhaust flow resistance, and to use the viscosity of the oil to absorb part of the oil mist and oil smoke in the exhaust airflow that contacts the liquid surface of the buffer oil pool.

[0009] In the above-mentioned sliding valve vacuum pump, the buffer shift device includes a buffer filter plate placed horizontally, the pump wall at the upper end of the pump body has an opening directly facing the exhaust oil pool, the outer wall at the upper end of the pump body is detachably connected with a filter seat plate that closes the opening, the buffer filter plate is mounted on the filter seat plate, and the buffer filter plate and the filter seat plate are spaced apart from each other. The inner wall of the filter seat plate has mounting bosses distributed at intervals, the buffer filter plate is horizontally mounted on the mounting bosses of the filter seat plate and forms a buffer space for oil and gas impact with the filter seat plate at the upper and lower intervals, when the airflow hits the top buffer filter, it can effectively increase the amount of oil passing through, and form a channel for the oil to quickly disperse to the side wall of the pump body, so that the precipitated oil flows back along the inner surface of the side wall of the pump body, avoiding the precipitated oil being entrained by the discharged oil and gas again due to untimely reflux.

[0010] In the above-mentioned sliding valve vacuum pump, the opening position extends toward the top of the buffer oil pool, and the baffle is fixedly connected to the extended edge of the opening position on the pump wall of the pump body. The baffle and the buffer filter plate form a right-angle reflux area so that the oil and gas are refluxed to the buffer oil pool in the right-angle reflux area. Under the action of the oil and gas airflow, the liquid level of the buffer oil pool will inevitably appear higher on the left and lower on the right. The greater the oil and gas flow rate, the greater the drop in the liquid level on the right side of the buffer oil pool, and the greater the increase in the area of ​​the air passage above the buffer oil pool; at the same time, the liquid surface of the buffer oil pool will appear arc-shaped, the buffering angle of the liquid surface of the buffer oil pool will become larger, and the buffering distance of the liquid surface will increase.

[0011] In the above-mentioned sliding valve vacuum pump, the upper end of the partition has an inclined plate for guiding the flow of oil and gas discharged from the exhaust valve, and the inclined plate is inclined in the direction away from the buffer oil pool. The inclined plate is added to the left wall of the exhaust oil pool, which can guide the movement direction of the left oil and gas flow to be non-parallel with the rest of the oil and gas flow, so that the oil and gas flow can interfere with each other above the exhaust oil pool, and the energy of the oil and gas flow can be weakened first; at the same time, the exhaust gas flow can be further compressed to hit the top buffer filter, and the inclined plate is lower than the left wall to ensure the reflux rate of the exhaust oil pool.

[0012] In the above-mentioned sliding valve vacuum pump, the pump chamber and one side of the pump body form a main oil pool, and the oil and gas filter is located above the main oil pool. The main oil pool is used to ensure the amount of oil in the oil pool, extend the circulation period of the lubricating oil, improve the cooling effect, and avoid the oil temperature rising.

[0013] In the above-mentioned sliding valve vacuum pump, a rectangular assembly cavity is provided at the exhaust port of the pump body above the main oil pool, and the oil-gas filter is detachably fixedly connected to the rectangular assembly cavity. The cavity wall of the rectangular assembly cavity and the pool wall of the buffer oil pool with the overflow hole form a guide channel, and the buffer oil pool and the main oil pool are connected through the guide channel. The purpose of this arrangement is to allow part of the discharged oil-gas flow to impact the oil level of the main oil pool through the guide channel, thereby reducing the oil-gas flow rate; the other part of the discharged oil-gas flow enters the oil-gas filter for oil-gas separation.

[0014] In the above-mentioned sliding valve vacuum pump, the oil and gas filter includes a connecting plate and a plurality of cylindrical filter elements arranged in a rectangular shape. The upper end of each filter element is fixed on the connecting plate, and the lower end of each filter element is respectively provided with a filter cartridge. The filter element and the corresponding filter cartridge are arranged in the same axial direction. The oil mist content in the oil and gas refluxed into each filter element is relatively small, generally oil smoke, and a small amount of oil mist will be filtered again through the filter element and discharged through the exhaust port after filtration.

[0015] In the above-mentioned sliding valve vacuum pump, the outer diameter of the filter cartridge is smaller than the outer diameter of the filter element, the filter cartridge and the filter element form an axial step, and the outer wall of the filter cartridge is evenly distributed with flow holes connected to the filter element. The purpose of this arrangement is to facilitate the oil and gas to enter the filter element from the flow holes of the filter cartridge for oil and gas filtration, which is convenient to use.

[0016] In the above-mentioned sliding valve vacuum pump, the bottom of the rectangular assembly cavity is provided with a plurality of assembly holes, and the orifice of the assembly hole is provided with an annular assembly step that is convexly arranged upwards, and each assembly step is arranged at intervals to form an oil drain groove at the bottom of the rectangular assembly cavity, and a one-way valve is arranged in the middle of the oil drain groove at the bottom of the rectangular assembly cavity, and the oil drain groove at the bottom of the rectangular assembly cavity is connected to the main oil pool through the one-way valve, and the filter cartridges are respectively arranged and assembled in the corresponding assembly holes, and the filter cartridges and filter elements form axial steps and assembly steps that are relatively positioned, and the exhaust port is located on the outer wall of the rectangular assembly cavity. The purpose of such a setting is to allow the oil remaining in the oil drain groove at the bottom of the rectangular assembly cavity to flow back to the main oil pool through the one-way valve, which is convenient to use.

[0017] Compared with the prior art, the advantages of this sliding valve vacuum pump are: reasonable and simple structural design, it can effectively reduce the flow velocity of oil and gas in the pump body, the oil and gas can be fully filtered in the pump body, the separation and filtration effect of oil and gas can be improved, the structural stability is good, and it is easy to produce and manufacture and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the slide valve vacuum pump part.

[0019] In the figure, 1. pump chamber; 2. pump body; 3. exhaust valve; 4. exhaust port; 5. exhaust oil pool; 6. buffer oil pool; 7. baffle; 8. partition; 9. overflow hole; 10. buffer filter plate; 11. filter seat plate; 12. inclined plate; 13. main oil pool; 14. guide channel; 15. connecting plate; 16. filter element; 17. filter cartridge; 18. flow hole; 19. oil drain tank; 20. one-way valve. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] like Figure 1 As shown, the sliding valve vacuum pump is mainly composed of a pump body 2 with a pump chamber 1 inside, an exhaust valve 3 is arranged on the pump chamber 1, and an exhaust port 4 is arranged on the opposite side wall of the pump body 2 away from the exhaust valve 3, and an oil and gas filter is detachably fixedly connected to the exhaust port 4, and a flow deceleration mechanism for slowing down the flow speed of oil and gas discharged from the exhaust valve 3 is arranged between the exhaust valve 3 and the oil and gas filter; in actual manufacturing, the specific implementation method of the flow deceleration mechanism is as follows: it is mainly composed of an exhaust oil pool 5 arranged upward and a buffer oil pool 6 adjacent to the exhaust oil pool 5 at the upper end of the outer wall of the pump chamber 1, the exhaust valve 3 is vertically assembled on the wall of the pump chamber 1 in the exhaust oil pool 5, the exhaust valve 3 is immersed in the oil in the exhaust oil pool 5 for the immersion gear of oil and gas flow, and a gear is arranged on the inner wall of the pump body 2 between the exhaust oil pool 5 and the buffer oil pool 6 to direct the oil and gas gear to flow to the buffer oil pool 6, and the oil in the buffer oil pool 6 a shifting device for absorbing oil on the surface; in actual manufacturing, the specific implementation method of the shifting device is as follows: it is mainly composed of a vertically arranged baffle 7, and the exhaust oil pool 5 and the buffer oil pool 6 are separated by a vertical partition 8. In actual design, the upper end of the partition 8 has an inclined plate 12 for guiding the flow of oil and gas discharged from the exhaust valve 3, and the inclined plate 12 is inclined in the direction away from the buffer oil pool 6; the top of the inclined plate 12 is lower than the partition 8; the baffle 7 is fixed on the pump body 2 above the buffer oil pool 6, and the baffle 7 extends downward into the buffer oil pool 6 and separates the buffer oil pool 6 from the left and right. The outer wall of the buffer oil pool 6 has an overflow hole 9 arranged horizontally, and the horizontal height of the overflow hole 9 is lower than the horizontal height of the lower edge of the baffle 7. A buffer device for oil filtering and oil and gas abutting against and flowing back to the buffer oil pool 6 is arranged on the pump body 2 between the exhaust oil pool 5 and the buffer oil pool 6.

[0022] During actual manufacturing, the specific implementation of the buffer shift device is as follows: it is mainly composed of a horizontally placed buffer filter plate 10, and the pump wall at the upper end of the pump body 2 has an opening position directly opposite to the exhaust oil pool 5. The outer wall of the upper end of the pump body 2 is detachably fixed with a filter seat plate 11 that closes the opening position. The buffer filter plate 10 is assembled on the filter seat plate 11, and the buffer filter plate 10 and the filter seat plate 11 are spaced apart from each other at the upper and lower parts; the opening position extends toward the top of the buffer oil pool 6, and the baffle 7 is fixed to the extended edge of the opening position on the pump wall of the pump body 2. The baffle 7 and the buffer filter plate 10 form a right-angle reflux zone, causing the oil and gas to reflux to the buffer oil pool 6 in the right-angle reflux zone.

[0023] During actual manufacturing, a rectangular assembly cavity is set at the exhaust port 4 of the pump body 2 above the main oil pool 13, and the oil-gas filter is detachably fixed to the rectangular assembly cavity. The cavity wall of the rectangular assembly cavity and the pool wall of the buffer oil pool 6 with the overflow hole 9 form a guide channel 14, and the buffer oil pool 6 and the main oil pool 13 are connected through the guide channel 14.

[0024] In actual application, the oil and gas filter includes a connecting plate 15 and four cylindrical filter elements 16 arranged in a rectangular shape. The upper end of each filter element 16 is fixed on the connecting plate 15, and the lower end of each filter element 16 is respectively provided with a filter cartridge 17. The filter element 16 and the corresponding filter cartridge 17 are distributed in the same axial direction; the outer diameter of the filter cartridge 17 is smaller than the outer diameter of the filter element 16, and the filter cartridge 17 and the filter element 16 form an axial step. The outer wall of the filter cartridge 17 is evenly distributed with flow holes 18 connected with the filter element 16.

[0025] During actual manufacturing, four assembly holes are arranged at the bottom of the rectangular assembly cavity. The orifice of the assembly hole has an annular assembly step that is convexly arranged. Each assembly step is spaced apart to form an oil drain groove 19 at the bottom of the rectangular assembly cavity. A one-way valve 20 is provided in the middle of the oil drain groove 19 at the bottom of the rectangular assembly cavity. The oil drain groove 19 at the bottom of the rectangular assembly cavity is connected to the main oil pool 13 through the one-way valve 20. The filter cartridges 17 are respectively arranged and assembled in the corresponding assembly holes. The filter cartridges 17 and the filter element 16 form axial steps and assembly steps that are relatively positioned. The exhaust port 4 is located on the outer wall of the rectangular assembly cavity.

[0026] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in the field. The specific embodiments described herein are merely examples of the spirit of the present invention. The technical personnel in the technical field to which the present invention belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A slide valve vacuum pump, comprising a pump body (2) having a pump chamber (1) therein, an exhaust valve (3) being arranged on the pump chamber (1), an exhaust port (4) being arranged on the opposite side wall of the pump body (2) away from the exhaust valve (3), an oil and gas filter being detachably fixedly connected to the exhaust port (4), characterized in that: A flow deceleration mechanism for slowing down the flow speed of the oil and gas discharged from the exhaust valve (3) is arranged between the exhaust valve (3) and the oil and gas filter; the flow deceleration mechanism comprises an exhaust oil pool (5) arranged upward at the upper end of the outer wall of the pump chamber (1) and a buffer oil pool (6) adjacent to the exhaust oil pool (5); the exhaust valve (3) is vertically mounted on the pump chamber wall in the exhaust oil pool (5); the exhaust valve (3) is immersed in the oil in the exhaust oil pool (5) for the immersion gear of the oil and gas flow; the inner wall of the pump body (2) between the exhaust oil pool (5) and the buffer oil pool (6) is provided with a A shifting device is provided for shifting the oil and gas to flow to the buffer oil pool (6) and absorbing the oil through the oil surface of the buffer oil pool (6); the shifting device comprises a vertically arranged baffle (7); the exhaust oil pool (5) and the buffer oil pool (6) are separated by a vertical partition (8); the baffle (7) is fixedly arranged on the pump body (2) above the buffer oil pool (6); the baffle (7) extends downward into the buffer oil pool (6) and separates the buffer oil pool (6) into left and right sides; the outer wall of the buffer oil pool (6) has an overflow hole (9) arranged horizontally; the overflow hole (9) is arranged The horizontal height of the pump body (2) is lower than the horizontal height of the lower edge of the baffle (7); a buffer device for filtering oil and abutting against oil and gas to flow back to the buffer oil pool (6) is provided on the pump body (2) between the exhaust oil pool (5) and the buffer oil pool (6); the buffer device comprises a buffer filter plate (10) placed horizontally; the pump wall at the upper end of the pump body (2) has an opening directly facing the exhaust oil pool (5); the outer wall at the upper end of the pump body (2) is detachably connected to a filter seat plate (11) for closing the opening; the buffer filter plate (10) is assembled on the filter seat plate (11) 1), the buffer filter plate (10) and the filter seat plate (11) are spaced apart from each other at the upper and lower parts; the opening portion extends toward the upper part of the buffer oil pool (6), the baffle plate (7) is fixedly connected to the extended edge of the opening portion on the pump wall of the pump body (2), the baffle plate (7) and the buffer filter plate (10) form a right-angle reflux zone so that the oil and gas abut against each other in the right-angle reflux zone and flow back to the buffer oil pool (6); the upper end of the vertical partition plate (8) has an inclined plate (12) for guiding the flow of oil and gas discharged from the exhaust valve (3); the pump chamber (1) and one side of the pump body (2) form a main oil pool (13).

2. A sliding valve vacuum pump according to claim 1, characterized in that: A rectangular assembly cavity is provided at the exhaust port (4) of the pump body (2) above the main oil pool (13), and the oil and gas filter is detachably fixedly connected to the rectangular assembly cavity. The cavity wall of the rectangular assembly cavity and the pool wall of the buffer oil pool (6) provided with the overflow hole (9) form a guide channel (14), and the buffer oil pool (6) and the main oil pool (13) are connected via the guide channel (14).

3. A sliding valve vacuum pump according to claim 2, characterized in that: The oil and gas filter comprises a connecting plate (15) and a plurality of cylindrical filter elements (16) arranged in a rectangular shape. The upper end of each filter element (16) is fixedly mounted on the connecting plate (15). The lower end of each filter element (16) is provided with a filter cartridge (17). The filter element (16) and the corresponding filter cartridge (17) are arranged in the same axial direction.

4. A sliding valve vacuum pump according to claim 3, characterized in that: The outer diameter of the filter cartridge (17) is smaller than the outer diameter of the filter element (16); the filter cartridge (17) and the filter element (16) form an axial step; and flow holes (18) communicating with the filter element (16) are evenly distributed on the outer wall of the filter cartridge (17).

5. A sliding valve vacuum pump according to claim 4, characterized in that: The bottom of the rectangular assembly cavity is provided with a plurality of assembly holes, and the opening of the assembly hole is provided with an annular assembly step which is convexly arranged upwards. Each assembly step is arranged at intervals so that an oil drain groove (19) is formed at the bottom of the rectangular assembly cavity. A one-way valve (20) is provided at the middle position of the oil drain groove (19) at the bottom of the rectangular assembly cavity. The oil drain groove (19) at the bottom of the rectangular assembly cavity is connected to the main oil pool (13) through the one-way valve (20). The filter cartridges (17) are respectively arranged and assembled in the corresponding assembly holes. The filter cartridges (17) and the filter element (16) form an axial step and an assembly step which are relatively positioned. The exhaust port (4) is located on the outer wall of the rectangular assembly cavity.

Images