A rotary vane vacuum pump oil mist separator

Abstract

An oil mist separator for a rotary vane vacuum pump belongs to the field of vacuum equipment technology. It includes an oil tank and an exhaust filter assembly. The oil tank is divided into an upper and lower chamber by a middle wall. The lower chamber is divided by a mesh plate to form a bottom chamber. The exhaust filter assembly is located in the upper chamber, with its inlet end extending out of the upper chamber and communicating with the lower chamber. An exhaust cover is provided on the cavity wall of the upper chamber facing the outlet end of the exhaust filter assembly. A return oil valve is also provided at the bottom of the cavity wall near the outlet end of the exhaust filter assembly, and a pump head return oil interface is located on one side of the return oil valve. A vacuum pump mounting interface and an oil supply interface are provided on the cavity wall of the lower chamber, away from the inlet end of the exhaust filter assembly. An oil baffle is provided on the vacuum pump mounting interface. An oil filter element communicating with the bottom chamber is provided on the side wall of the oil tank. Advantages: good oil mist separation performance, low noise, easy maintenance, and can effectively improve the long-term operational stability of the vacuum pump.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum equipment technology, and specifically relates to an oil mist separator for a rotary vane vacuum pump. Background Technology

[0002] Rotary vane vacuum pumps are among the most widely used vacuum-generating devices in modern industrial production. They can achieve high ultimate vacuum levels, are simple to use and maintain, and are economical, thus gaining widespread application in the vacuum industry. A rotary vane vacuum pump is a mechanical vacuum pump that requires vacuum pump oil for lubrication and sealing. During operation, the vacuum pump oil not only lubricates the vanes and pump chamber but also plays a crucial role in sealing the pump chamber gap, cooling the pump body, and dissipating frictional heat.

[0003] As a key component of rotary vane vacuum pumps, the oil mist separator's main function is to collect, separate, and store the vacuum pump oil carried in the exhaust gas, and then recycle the separated oil back into the pump head via an oil return system. In actual operation, especially when the vacuum pump is drawing large amounts of gas, existing oil mist separators generally suffer from severe oil spraying, loud exhaust noise, and poor oil return. These problems not only increase vacuum pump oil consumption but also cause environmental pollution and equipment malfunctions, seriously affecting the long-term stable operation of the vacuum pump.

[0004] In view of the aforementioned existing technology, the applicant has made beneficial designs, and the technical solutions to be introduced below are produced in this context. Utility Model Content

[0005] The purpose of this invention is to provide an oil mist separator for a rotary vane vacuum pump, which has good oil mist separation performance, low noise, and is easy to maintain, and can effectively improve the long-term operational stability of the vacuum pump.

[0006] The purpose of this utility model is achieved as follows: a rotary vane vacuum pump oil mist separator includes an oil tank and an exhaust filter assembly. The interior of the oil tank is divided into an upper chamber and a lower chamber by a middle wall. The lower chamber is divided into a bottom chamber by a mesh plate. The exhaust filter assembly is disposed in the upper chamber, and its inlet end extends out of the upper chamber and communicates with the lower chamber. An exhaust cover is provided on the cavity wall of the upper chamber facing the outlet end of the exhaust filter assembly. An oil return valve is also provided at the bottom of the cavity wall of the upper chamber near the outlet end of the exhaust filter assembly, and a pump head oil return interface is provided on one side of the oil return valve. A vacuum pump mounting interface and an oil supply interface are provided on the cavity wall of the lower chamber away from the inlet end of the exhaust filter assembly. An oil baffle is provided on the vacuum pump mounting interface. An oil filter element communicating with the bottom chamber is provided on the side wall of the oil tank.

[0007] In a specific embodiment of this utility model, the fuel tank is provided with a rear blind plate on the rear side wall and a right blind plate on the right side wall.

[0008] In another specific embodiment of this utility model, an oil filling plug is provided on the wall of the lower cavity, and an oil drain plug is provided on the wall of the bottom cavity.

[0009] In another specific embodiment of this utility model, an oil level mirror is also provided on the cavity wall of the bottom cavity, and the oil level mirror is located above the drain plug.

[0010] In another specific embodiment of the present invention, the exhaust cover has an exhaust cover cavity inside, the exhaust cover is open facing the upper cavity, and an exhaust baffle is provided in the middle of the open. The exhaust cover has an exhaust port communicating with the exhaust cover cavity on the side opposite to the open. A gap is formed between the bottom of the exhaust cover cavity and the exhaust baffle, and the exhaust cover cavity and the upper cavity are connected through the gap.

[0011] In another specific embodiment of this utility model, the end of the middle wall facing the exhaust cover is recessed downwards, forming a return oil chamber with the side wall of the oil tank on that side. The return oil valve is provided corresponding to the return oil chamber. The end of the middle wall away from the exhaust cover is bent upwards and installed with the exhaust filter element assembly. A gap is formed between this end of the middle wall and the end wall of the oil tank. The lower chamber is connected to the upper chamber through the gap.

[0012] In a further specific embodiment of this utility model, the middle wall is inclined downward from the air inlet side of the exhaust filter element assembly toward the oil return chamber.

[0013] Due to the aforementioned structure, this utility model offers several advantages over existing technologies: First, the exhaust filter assembly and exhaust cover perform two-stage oil mist separation, resulting in superior oil mist separation performance and improved efficiency. Second, the exhaust flow is slowed by the baffle and then filtered by the deflector and exhaust filter assembly, effectively reducing exhaust noise and improving the working environment. Third, a return oil channel is provided at the bottom of the exhaust cover cavity, allowing oil droplets carried out by the airflow in the exhaust to flow back to the oil tank through the gap, effectively preventing vacuum pump oil from being carried out by the exhaust, providing good anti-spraying performance and avoiding the risk of oil shortage during long-term operation. Fourth, the oil tank is equipped with a filler plug, oil level gauge, and drain plug, facilitating oil level observation and vacuum pump oil replacement, simplifying maintenance and extending equipment lifespan. Attached Figure Description

[0014] Figure 1 This is a front and side view of the present invention; Figure 2 This is a schematic diagram of the back side of this utility model; Figure 3 This is a schematic diagram of the left side of this utility model; Figure 4 for Figure 3 Sectional view at point AA; Figure 5 This is a cross-sectional view of the exhaust cover described in this utility model.

[0015] In the diagram: 1. Oil tank; 11. Middle wall; 12. Upper chamber; 121. Pump head return oil interface; 13. Lower chamber; 131. Vacuum pump mounting interface; 1311. Oil baffle; 132. Oil supply interface; 14. Mesh plate; 15. Bottom chamber; 16. Rear blind plate; 17. Right blind plate; 18. Return oil chamber; 19. Gap; 2. Exhaust filter element assembly; 3. Exhaust cover; 31. Exhaust cover cavity; 32. Opening; 33. Exhaust baffle; 34. Exhaust port; 35. Gap; 4. Return oil valve; 5. Oil filter element; 6. Filler plug; 7. Drain plug; 8. Oil level mirror. Detailed Implementation

[0016] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0017] This utility model relates to an oil mist separator for a rotary vane vacuum pump. Figure 1 These are schematic diagrams of the front and rear views of the oil mist separator. In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and rear will be expressed in [the format of the diagram]. Figure 1 The description of the location and state is intended to facilitate public understanding and should not be construed as a special limitation on the technical solution provided by this utility model.

[0018] See Figures 1 to 4 The rotary vane vacuum pump oil mist separator includes an oil tank 1 and an exhaust filter assembly 2, with the oil tank 1 being the main body of the oil mist separator. The interior of the oil tank 1 is divided by a middle wall 11 to form an upper chamber 12 and a lower chamber 13. The lower chamber 13 is divided by a mesh plate 14 to form a bottom chamber 15. The exhaust filter assembly 2 is disposed within the upper chamber 12, with its inlet end extending out of the upper chamber 12 and communicating with the lower chamber 13. An exhaust cover 3 is provided on the cavity wall of the upper chamber 12 facing the outlet end of the exhaust filter assembly 2. A return oil valve 4 is also provided at the bottom of the cavity wall of the upper chamber 12 near the outlet end of the exhaust filter assembly 2, and a pump head return oil interface 121 is provided on one side of the return oil valve 4. Specifically, see... Figure 4The middle wall 11 is recessed downwards at one end facing the exhaust cover 3, forming an oil return chamber 18 with the side wall of the oil tank 1 on that side. The oil return valve 4 is provided corresponding to the oil return chamber 18 to facilitate oil collection. The end of the middle wall 11 away from the exhaust cover 3 is bent upwards and installed with the exhaust filter element assembly 2. A gap 19 is formed between this end of the middle wall 11 and the end wall of the oil tank 1. The lower chamber 13 communicates with the upper chamber 12 through this gap 19. To accelerate oil collection, the middle wall 11 is inclined downwards from the air inlet end of the exhaust filter element assembly 2 toward the oil return chamber 18. The lower chamber 13 has a vacuum pump mounting interface 131 and an oil supply interface 132 on the chamber wall away from the air inlet end of the exhaust filter element assembly 2. An oil baffle 1311 is provided on the vacuum pump mounting interface 131. The oil tank 1 has an oil filter element 5 on its side wall that communicates with the bottom chamber 15.

[0019] Furthermore, an oil filler plug 6 is provided on the wall of the lower cavity 13, and an oil drain plug 7 is provided on the wall of the bottom cavity 15. An oil level mirror 8 is also provided on the wall of the bottom cavity 15, positioned above the oil drain plug 7. This facilitates user observation of the oil level and replacement of the vacuum pump oil, simplifying maintenance and extending the equipment's service life.

[0020] Furthermore, the fuel tank 1 is provided with a rear blind plate 16 on the rear side wall and a right blind plate 17 on the right side wall. The rear blind plate 16 and the right blind plate 17 are openable and closable to allow maintenance personnel to install and maintain the fuel tank 1.

[0021] Further, see Figure 5 The exhaust cover 3 has an exhaust cover cavity 31 inside. The exhaust cover 3 is formed as an opening 32 facing the upper cavity 12, and an exhaust baffle 33 is provided in the middle of the opening 32. The exhaust cover 3 has an exhaust port 34 on the side opposite to the opening 32 that communicates with the exhaust cover cavity 31. A gap 35 is formed between the bottom of the exhaust cover cavity 31 and the exhaust baffle 33. The exhaust cover cavity 31 and the upper cavity 12 are connected through the gap 35.

[0022] In use, the vacuum pump is mounted on the vacuum pump mounting interface 131, and the oil supply interface 132 is connected to the vacuum pump via a pipe. When the vacuum pump is working, the exhaust gas is blocked by the oil baffle 1311 and then enters the lower chamber 13 from above the oil baffle 1311. Figure 4 As indicated by the arrow, exhaust gas comes from the right side of the middle wall 11 and the fuel tank 1. Figure 1 The gap 19 between the reference sidewalls, i.e. Figure 4The exhaust gas enters the upper left of the exhaust filter assembly 2. After being filtered by the exhaust filter assembly 2, the exhaust gas enters the upper chamber 12 and is finally discharged through the exhaust port 34 of the exhaust cover 3. The exhaust gas of the rotary vane vacuum pump contains a large amount of vacuum pump oil. When the exhaust gas enters the lower chamber 13, it is blocked and buffered, and the exhaust flow rate is slowed down. Some oil droplets in the exhaust gas pass through the mesh plate 14 and flow into the bottom chamber 15. After the exhaust gas is deflected, the gas and oil droplets are separated by the exhaust filter assembly 2. The separated oil passes through the return oil valve 4 and is sent back to the pump head through the pump head return oil interface 121 via the pipeline. The exhaust gas is buffered and deflected, which effectively reduces the exhaust noise.

[0023] like Figure 5 When the rotary vane vacuum pump is working, the exhaust gas is blocked and buffered by the exhaust baffle 33. The oil droplets carried out by the airflow in the exhaust gas flow into the bottom of the exhaust cover cavity 31. Finally, the oil droplets flow back to the upper cavity 12 through the gap 35, which effectively prevents the vacuum pump oil from being carried out of the oil tank 1 by the exhaust gas and avoids the risk of oil shortage during long-term operation of the vacuum pump.

[0024] This invention has good oil mist separation performance, effectively improving oil mist separation efficiency. It is also low-noise, easy to maintain, and can effectively improve the long-term operational stability of vacuum pumps, thus achieving the purpose of the invention.

Claims

1. A rotary vane vacuum pump oil mist separator, comprising an oil tank (1) and an exhaust filter assembly (2), characterized in that: The interior of the oil tank (1) is divided into an upper cavity (12) and a lower cavity (13) by a middle wall (11). The lower cavity (13) is divided by a mesh plate (14) to form a bottom cavity (15) at the bottom. The exhaust filter assembly (2) is located in the upper cavity (12) and its air inlet extends out of the upper cavity (12) and communicates with the lower cavity (13). An exhaust cover (3) is provided on the cavity wall of the upper cavity (12) facing the air outlet of the exhaust filter assembly (2). The upper cavity (12) is also close to the exhaust filter. A return oil valve (4) is provided at the bottom of the cavity wall at the outlet end of component (2), and a pump head return oil interface (121) is provided on one side of the return oil valve (4). The lower cavity (13) is provided with a vacuum pump installation interface (131) and an oil supply interface (132) at the inlet end of the cavity wall away from the exhaust filter element component (2). An oil baffle (1311) is provided on the vacuum pump installation interface (131). An oil filter element (5) communicating with the bottom cavity (15) is provided on the side wall of the oil tank (1).

2. The rotary vane vacuum pump oil mist separator according to claim 1, characterized in that: The oil tank (1) is provided with a rear blind plate (16) on the rear side wall and a right blind plate (17) on the right side wall.

3. The rotary vane vacuum pump oil mist separator according to claim 1, characterized in that: An oil plug (6) is provided on the wall of the lower cavity (13), and an oil drain plug (7) is provided on the wall of the bottom cavity (15).

4. The rotary vane vacuum pump oil mist separator according to claim 3, characterized in that: An oil level mirror (8) is also provided on the cavity wall of the bottom cavity (15), and the oil level mirror (8) is located above the drain plug (7).

5. The rotary vane vacuum pump oil mist separator according to claim 1, characterized in that: The exhaust cover (3) has an exhaust cover cavity (31) inside. The exhaust cover (3) is formed as an opening (32) facing the upper cavity (12), and an exhaust baffle (33) is provided in the middle of the opening (32). The exhaust cover (3) has an exhaust port (34) on the side opposite to the opening (32) that communicates with the exhaust cover cavity (31). A gap (35) is formed between the bottom of the exhaust cover cavity (31) and the exhaust baffle (33). The exhaust cover cavity (31) and the upper cavity (12) are connected through the gap (35).

6. The rotary vane vacuum pump oil mist separator according to claim 1, characterized in that: The middle wall (11) is recessed downward at one end facing the exhaust cover (3), forming a return oil chamber (18) with the side wall of the oil tank (1) on that side. The return oil valve (4) is provided corresponding to the return oil chamber (18). The middle wall (11) away from the exhaust cover (3) is bent upward and installed with the exhaust filter element assembly (2). A gap (19) is formed between this end of the middle wall (11) and the end wall of the oil tank (1). The lower chamber (13) is connected to the upper chamber (12) through the gap (19).

7. The rotary vane vacuum pump oil mist separator according to claim 6, characterized in that: The middle wall (11) is inclined downward from the air inlet side of the exhaust filter assembly (2) toward the oil return chamber (18).

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