A rotary vane vacuum pump intake assembly and rotary vane vacuum pump

Abstract

The utility model relates to a rotary vane vacuum pump technical field discloses a rotary vane vacuum pump air intake subassembly and rotary vane vacuum pump, air intake subassembly detachable connection is on the air inlet of vacuum pump, including the air intake nozzle, filter cavity and connecting portion that communicate in proper order, connecting portion is butt joint with air inlet, and the relative butt joint surface of connecting portion and air inlet forms sealed interval, and the flexible sealing portion is equipped in sealed interval, and the detachable graded filter piece is equipped in filter cavity, and the inner chamber of air intake nozzle is the expanding channel structure, through setting detachable air intake subassembly, the overall maintenance is convenient, and the cooperation of sealed interval and flexible sealing portion guarantees the reliable sealing of junction, and graded filter piece improves the filtering efficiency, and the expanding channel structure effectively reduces the air intake speed, and reduces the air flow resistance, the integrated design of this air intake subassembly makes rotary vane vacuum pump convenient to maintain, and the sealing is reliable, and the filtration is efficient and the air flow is smooth, and ultimately is favorable to the promotion vacuum degree stability and pumping efficiency of vacuum pump.

Description

Technical Field

[0001] This utility model relates to the field of rotary vane vacuum pump technology, and in particular to a rotary vane vacuum pump inlet assembly and a rotary vane vacuum pump. Background Technology

[0002] Rotary vane vacuum pumps, a typical type of oil-sealed positive displacement vacuum pump, achieve periodic changes in pump chamber volume through the eccentric rotation of a rotor driving the sliding of vanes, thereby completing the intake and exhaust of gas. They are widely used in industrial fields such as electronics manufacturing, vacuum coating, chemical reactions, and food packaging. The intake assembly, as the core component connecting the rotary vane vacuum pump to the system being pumped, directly determines the pump's ultimate vacuum, pumping rate, and service life through its sealing performance, filtration effect, and airflow guiding capability. Seal failure leads to gas leakage, insufficient filtration causes wear on internal components, and turbulent airflow increases intake resistance; all of these problems significantly reduce the operational stability of the equipment. Utility Model Content

[0003] This application discloses an air intake assembly for a rotary vane vacuum pump and a rotary vane vacuum pump, in order to solve the technical problem of poor equipment operation stability in existing rotary vane vacuum pumps in related technologies.

[0004] To solve the above problems, the present invention adopts the following technical solution: This utility model provides an air inlet assembly for a rotary vane vacuum pump, which is disposed on the air inlet of the pump body. The air inlet assembly is detachably connected to the air inlet and includes an air inlet nozzle, a filter chamber, and a connecting part connected in sequence. The connecting part is connected to the air inlet, and the relative mating surfaces of the connecting part and the air inlet form a sealing gap. A flexible sealing part is provided within the sealing gap. The filter chamber is provided with a detachable graded filter element, and the inner cavity of the air inlet nozzle has a gradually expanding channel structure.

[0005] Preferably, the flexible sealing part includes a sealing gasket arranged coaxially, one side of the sealing gasket is provided with an embedded mounting structure, and the end face of the connecting part is provided with a mounting groove adapted to the embedded mounting structure. The sealing gasket is fixed to the connecting part by the cooperation between the embedded mounting structure and the mounting groove.

[0006] Preferably, the sealing gasket is made of rubber, and when the connection part is connected to the air inlet, the sealing gasket is in a state of axial compression and radial extension deformation.

[0007] Preferably, the graded filter element includes a coarse filter screen, a fine filter screen, and a support frame arranged sequentially from top to bottom. The coarse filter screen has a pore size of 80-120 mesh, and the fine filter screen has a pore size of 200-300 mesh. The inner wall of the filter chamber is provided with a positioning step, the support frame abuts against the positioning step, and the port of the filter chamber is provided with a retaining spring for limiting the graded filter element.

[0008] Preferably, the inner wall of the gradually expanding channel of the air inlet is provided with a spiral guide rib, the spiral guide rib extends along the axial direction of the air inlet, and the pitch of the spiral guide rib gradually decreases from the air inlet end to the air outlet end.

[0009] Preferably, the connecting part and the air inlet are detachably connected by a flange structure. The flange structure includes a connecting flange disposed on the outer wall of the connecting part and a docking flange disposed on the surface of the pump body. The connecting flange and the docking flange are fixed by bolts, and an auxiliary sealing gasket is provided between them.

[0010] Preferably, the filter chamber and the air inlet are an integral structure, and an observation window is provided on the side wall of the filter chamber, with a transparent acrylic plate sealed and embedded in the observation window.

[0011] Preferably, the air inlet end of the air inlet is provided with a detachable dust cover, the dust cover and the air inlet are connected by threads, and the center of the dust cover is provided with a vent hole, and a dust filter is provided in the vent hole.

[0012] To solve the technical problem, this utility model also provides a rotary vane vacuum pump, including a pump body, an exhaust port opened on the pump body, and a pump chamber disposed inside the pump body. The pump chamber is provided with an eccentrically mounted rotor, and a rotary vane is slidably connected to the rotor. The pump body is provided with an air inlet communicating with the pump chamber, and the air inlet is provided with the rotary vane vacuum pump air inlet assembly as described above.

[0013] The technical solution adopted in this utility model can achieve the following beneficial effects: 1. This utility model provides an air intake assembly for a rotary vane vacuum pump, detachably connected to the air intake port of the rotary vane vacuum pump body. It includes an air intake nozzle, a filter chamber, and a connecting part connected in sequence. The connecting part is aligned with the air intake port, and the relative mating surfaces of the connecting part and the air intake port form a sealing gap, within which a flexible sealing part is provided. The filter chamber contains a detachable graded filter element, and the inner cavity of the air intake nozzle has a gradually expanding channel structure. By setting a detachable air intake assembly, the modularity of the air intake structure is achieved, facilitating overall maintenance. The cooperation between the sealing gap and the flexible sealing part ensures reliable sealing at the connection point. The graded filter element improves filtration efficiency. The gradually expanding channel structure effectively reduces the air intake velocity and reduces airflow resistance. This integrated design of the air intake assembly makes the rotary vane vacuum pump easy to maintain, provides reliable sealing, high filtration efficiency, and stable airflow, ultimately contributing to improved vacuum stability and pumping efficiency of the vacuum pump.

[0014] 2. The flexible sealing part includes a coaxially arranged sealing gasket. One side of the sealing gasket has an embedded mounting structure, and the end face of the connecting part has a mounting groove adapted to the embedded mounting structure. The sealing gasket is fixed to the connecting part through the cooperation between the embedded mounting structure and the mounting groove. The cooperation between the embedded mounting structure and the mounting groove ensures the accurate positioning and fixation of the sealing gasket and prevents displacement during installation. Combined with the flexible sealing part, it further improves the reliability of the seal and the convenience of installation. At the same time, the fixing structure can limit the displacement of the sealing gasket under vibration conditions, further ensuring the stability of the seal and extending the effective service life of the sealing assembly.

[0015] 3. The sealing gasket is made of rubber. When the connection part is connected to the air inlet, the sealing gasket is in a state of axial compression and radial extension deformation. It can actively compensate for minor unevenness or assembly errors of the mating surface between the air inlet and the connection part, and increase the sealing contact area. At the same time, the elastic deformation can buffer the vibration and impact of the pump body during operation, reduce the permanent deformation of the seal, avoid sealing gaps caused by vibration or aging, and significantly improve sealing reliability and service life.

[0016] 4. The graded filter element includes a coarse filter screen, a fine filter screen, and a support frame arranged sequentially from top to bottom. The coarse filter screen has an aperture of 80-120 mesh, and the fine filter screen has an aperture of 200-300 mesh. The inner wall of the filter chamber is provided with a positioning step, and the support frame abuts against the positioning step. A retaining spring is provided at the port of the filter chamber to limit the graded filter element. The combination of coarse and fine filter screens realizes graded filtration, effectively intercepting impurities of different particle sizes, achieving efficient graded filtration, and effectively protecting the rotor and vanes in the pump chamber from wear. The support frame provides structural support to prevent filter screen deformation. The cooperation of the positioning step and the retaining spring enables quick installation and reliable fixation of the filter element, while facilitating replacement and maintenance, greatly reducing maintenance difficulty and time costs.

[0017] 5. The inner wall of the gradually expanding channel of the air inlet is provided with a spiral guide rib. The spiral guide rib extends along the axial direction of the air inlet, and the pitch of the spiral guide rib gradually decreases from the air inlet end to the air outlet end. The spiral guide rib can guide the airflow to flow smoothly and spirally along the inner wall of the channel, avoiding the turbulent eddies formed by the airflow in the existing straight channel with equal diameter. The design of the pitch gradually optimizes the airflow velocity, reduces the pressure loss of the airflow in the channel, and reduces the air intake resistance. The combination of the two allows the airflow to enter the pump chamber in a stable state, which improves the pumping speed and reduces the impact of airflow impact on the vibration of the vanes and rotor, thus extending the service life of the components.

[0018] 6. The connection between the connecting part and the air inlet is detachably connected via a flange structure. The flange structure includes a connecting flange on the outer wall of the connecting part and a mating flange on the surface of the pump body. The connecting flange and the mating flange are fixed by bolts, and an auxiliary sealing gasket is provided between them. The flange structure is fixed by bolts, which has higher connection strength and stability than traditional threaded connections. It can effectively resist the vibration of the pump body during operation and avoid sealing failure caused by loosening of the connection after long-term use. The auxiliary sealing gasket and the flexible sealing part form a "double sealing" structure, which further blocks the infiltration path of external air, significantly improves the overall sealing reliability of the air inlet, and ensures that the vacuum pump can stably maintain the rated vacuum level.

[0019] 7. The filter chamber and air intake nozzle are integrated into one structure. An observation window is provided on the side wall of the filter chamber, and a transparent acrylic plate is sealed and embedded in the observation window. The integrated structure reduces the connection interface between the filter chamber and the air intake nozzle, avoiding the risk of leakage at the interface, while improving the overall structural rigidity and extending the service life of the air intake component. The transparent acrylic observation window allows for a direct view of the clogging and damage status of the filter screen inside the filter chamber. Maintenance can be determined without disassembling the air intake component, solving the problem that existing structures require disassembly to inspect the filter screen, and greatly improving maintenance convenience.

[0020] 8. The air inlet end of the air inlet is equipped with a removable dust cover. The dust cover is connected to the air inlet via a thread, and a vent hole is opened in the center of the dust cover. A dust filter screen is installed in the vent hole. When the machine is stopped, the dust cover can prevent external dust and debris from entering the air intake assembly, avoiding contamination of the filter screen when not in operation. The threaded connection makes it easy to install and remove the dust cover without affecting normal air extraction operations. The dust filter screen in the vent hole can perform preliminary filtration of the incoming gas, reduce the burden on the staged filter elements, extend their replacement cycle, and further improve the overall service life of the filtration system.

[0021] 9. This utility model also provides a rotary vane vacuum pump, including a pump body, an exhaust port opened on the pump body, and a pump chamber disposed inside the pump body. An eccentrically mounted rotor is disposed inside the pump chamber, and a rotary vane is slidably connected to the rotor. An air inlet communicating with the pump chamber is opened on the pump body, and an air inlet assembly for the rotary vane vacuum pump as described above is disposed at the air inlet. It has the same beneficial technical effects as the aforementioned rotary vane vacuum pump air inlet assembly, and will not be described again here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional view of a rotary vane vacuum pump disclosed in some embodiments of this application; Figure 2 yes Figure 1 Enlarged view of A in the middle; Figure 3 yes Figure 1 Enlarged view of B in the middle; Figure 4 This is a schematic diagram of a rotary vane vacuum pump disclosed in some embodiments of this application.

[0024] In the picture: 1. Rotary vane vacuum pump inlet assembly; 2. Rotary vane vacuum pump; 10. Air inlet; 11. Filter chamber; 12. Connecting part; 20. Air inlet; 21. Flange structure; 22. Pump body; 23. Exhaust port; 24. Rotor; 25. Vane; 26. Pump chamber; 100. Spiral guide rib; 101. Dust cover; 110. Graded filter element; 111. Positioning step; 112. Snap ring; 113. Observation window; 120. Sealing gap; 121. Flexible sealing part; 122. Mounting groove; 210. Auxiliary sealing gasket; 1010 Dust filter; 1100 Coarse filter; 1101 Fine filter; 1102 Support frame; 1210 Sealing gasket; 1211 Embedded installation structure. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] The air intake structure of existing rotary vane vacuum pumps has gradually revealed many technical defects in long-term use, mainly in the following aspects: Sealing performance is prone to degradation and reliability is insufficient: Currently, most mainstream air inlet seals adopt side-mounted O-rings or flat gasket structures, with only line contact or partial surface contact between the seal and the mating surface. Under the vibration generated by pump operation and long-term aging, the seal is prone to permanent compression deformation, edge cracking, and other problems, resulting in tiny gaps at the mating surface. This allows outside air to seep into the pump chamber, directly causing a decrease in vacuum or even failing to reach the rated vacuum target. In some structures, the seal lacks a positioning installation design, making it prone to misalignment during assembly, further increasing the risk of seal failure.

[0028] The filter structure is difficult to maintain and has low interception efficiency: To prevent impurities from entering the pump chamber, existing air intake structures often integrate a single filter screen inside the air intake nozzle. However, the filter screen is often fixedly connected to the inner wall of the air intake nozzle or installed using a snap-fit ​​method. When the filter screen is clogged or damaged, the entire air intake assembly or even part of the pump body structure needs to be disassembled for replacement, making maintenance cumbersome and time-consuming. At the same time, a single-stage filter screen cannot meet the needs of both coarse particle interception and fine dust filtration: If the filter screen pore size is too large, fine impurities will penetrate the filter screen and enter the pump chamber, getting stuck between the vane and the pump chamber, causing component wear, or even vane jamming failure; if the pore size is too small, it is easy to clog quickly, resulting in a sharp increase in air intake resistance and a significant reduction in air extraction efficiency.

[0029] Turbulent airflow at the intake limits pumping efficiency: Existing intake nozzles often employ a straight channel design with equal diameter, which easily creates vortices after gas enters. Especially under high-flow pumping conditions, uneven airflow distribution causes localized pressure losses and increases intake resistance. This airflow condition not only reduces the pumping rate per unit time but also leads to pressure fluctuations within the pump chamber, exacerbating the impact vibration between the vanes and rotor, and indirectly shortening the equipment's service life.

[0030] Poor overall maintainability of the intake assembly: Most intake structures are connected to the pump body by welding or threaded hard connection. When faults such as wear on the inner wall of the intake channel or scratches on the sealing surface occur, the intake assembly cannot be disassembled separately for repair or replacement. The entire pump body must be disassembled, which not only increases maintenance costs but also prolongs equipment downtime.

[0031] The following is in conjunction with the appendix Figures 1 to 4 The present application provides a detailed description of a rotary vane vacuum pump inlet assembly and a rotary vane vacuum pump through specific embodiments and application scenarios.

[0032] like Figure 1-4 As shown, in this embodiment, the rotary vane vacuum pump inlet assembly 1 is installed on the inlet 20 of the pump body 22 of the rotary vane vacuum pump 2. The inlet assembly 1 is detachably connected to the inlet 20 and specifically includes an inlet nozzle 10, a filter chamber 11 and a connecting part 12 connected in sequence. The three form a continuous gas flow channel, and the external gas enters the pump body 22 after passing through the inlet nozzle 10, the filter chamber 11 and the connecting part 12 in sequence.

[0033] Furthermore, the end face of the connecting part 12 is positioned opposite to the end face of the air inlet 20, forming an annular sealing gap 120 between them. A flexible sealing part 121 is provided within the sealing gap 120. The flexible sealing part 121 includes a sealing gasket 1210 coaxially disposed with the connecting part 12. An annular embedded mounting structure 1211 is integrally formed on one side of the sealing gasket 1210. A mounting groove 122 adapted to the embedded mounting structure 1211 is provided on the mating end face of the connecting part 12. The embedded mounting structure 1211 is interference-fitted into the mounting groove 122, thereby achieving precise positioning and fixation of the sealing gasket 1210 on the connecting part 12 and preventing misalignment during assembly.

[0034] Specifically, the sealing gasket 1210 is made of nitrile rubber (with oil resistance suitable for vacuum pump operation). When the connecting part 12 is mated and locked with the air inlet 20, the sealing gasket 1210 undergoes compression deformation under axial pressure (compression amount is 1-1.5mm), and at the same time naturally extends radially, closely fitting the mating surface of the air inlet 20. Through elastic deformation, it compensates for assembly errors and component wear, forming a reliable seal.

[0035] Furthermore, the filter chamber 11 is a cylindrical cavity with an integrally formed annular positioning step 111 on its inner wall. A detachable graded filter element 110 is supported on the positioning step 111. The graded filter element 110 includes, from top to bottom, a coarse filter screen 1100, a fine filter screen 1101, and a support frame 1102. The coarse filter screen 1100 is made of 100-mesh stainless steel mesh (intercepting impurities with a particle size ≥150μm). Specifically, the fine filter screen 1101 is made of 250-mesh nylon mesh (intercepting impurities with a particle size ≥50μm). The support frame 1102 is a metal mesh structure used to prevent the filter screen from deforming under airflow impact. An elastic retaining spring 112 is snapped into the top end of the filter chamber 11. The retaining spring 112 cooperates with the positioning step 111 to axially limit the graded filter element 110. During disassembly, only the retaining spring 112 needs to be removed to pull out the entire graded filter element 110, which is convenient for cleaning or replacement.

[0036] Furthermore, the inner cavity of the air inlet 10 adopts a gradually expanding channel, which can reduce airflow speed and reduce turbulence. The inner wall of the channel is integrally formed with three spiral guide ribs 100. The spiral guide ribs 100 extend along the axial direction of the air inlet 10, and the pitch gradually decreases from the air outlet end to the air inlet end, guiding the airflow to flow smoothly along the spiral path, avoiding the formation of eddies, and allowing the gas to enter the filter chamber 11 evenly.

[0037] Furthermore, the detachable connection between the connecting part 12 and the air inlet 20 is achieved through the flange structure 21: the outer wall of the connecting part 12 is integrally formed with a connecting flange, and the surface of the pump body 22 is provided with a corresponding mating flange. Both the connecting flange and the mating flange are provided with four circumferentially distributed bolt holes, which are fixed by bolts. After assembly, an auxiliary sealing gasket 210 is provided in the gap between the two, forming a double seal with the flexible sealing part 121, further improving the anti-leakage performance.

[0038] Specifically, the filter chamber 11 and the air inlet 10 adopt an integrated welded structure to reduce the number of connection interfaces and reduce the risk of leakage. The side wall of the filter chamber 11 has an observation window 113, and a transparent acrylic plate is embedded in the observation window 113 through a sealing ring, which allows for direct observation of the contamination status of the graded filter element 110, and the maintenance time can be determined without disassembly.

[0039] Furthermore, the air inlet end of the air inlet 10 is provided with a removable dust cover 101 by a threaded connection. The dust cover 101 has a vent hole in the center, and a 100-mesh dust filter 1010 is embedded in the vent hole. When the machine is stopped, it can block the entry of external dust. When the machine is working, it performs preliminary filtration of the gas, reducing the burden on the graded filter element 110.

[0040] Understandably, by setting up a detachable air intake assembly 1, the air intake structure is modularized, which facilitates overall maintenance; the cooperation between the sealing gap 120 and the flexible sealing part 121 ensures a reliable seal at the connection; the staged filter element 110 improves the filtration efficiency; the gradually expanding channel structure effectively reduces the air intake speed and reduces airflow resistance; the integrated design of this air intake assembly 1 makes the rotary vane vacuum pump 2 easy to maintain, reliably sealed, highly efficient in filtration and stable in airflow, which ultimately helps to improve the vacuum stability and pumping efficiency of the vacuum pump.

[0041] Another embodiment of this utility model discloses a rotary vane vacuum pump 2, including a pump body 22, an exhaust port 23 opened on one side of the pump body 22 and an internal pump chamber 26. An eccentrically mounted rotor 24 is provided in the pump chamber 26. Two vanes 25 are slidably connected to the rotor 24 by springs. An air inlet 20 communicating with the pump chamber is opened on the other side of the pump body 22. The rotary vane vacuum pump air inlet assembly 1 is fixedly installed at the air inlet 20 by the above-mentioned flange structure 21. The gas enters the pump chamber after being filtered and guided by the air inlet assembly 1. The pumping operation is completed by the cooperation of the rotor 24 and the vanes 25.

[0042] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0043] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0044] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A rotary vane vacuum pump intake assembly provided on an intake port of a pump body of a rotary vane vacuum pump, characterized in that, The air intake assembly is detachably connected to the air intake port. The air intake assembly includes an air intake nozzle, a filter chamber, and a connecting part connected in sequence. The connecting part is connected to the air intake port, and the relative mating surfaces of the connecting part and the air intake port form a sealing gap. A flexible sealing part is provided within the sealing gap. A detachable graded filter element is provided inside the filter chamber. The inner cavity of the air intake nozzle has a gradually expanding channel structure.

2. A sliding vane vacuum pump gas inlet assembly according to claim 1, wherein, The flexible sealing part includes a sealing gasket arranged coaxially. One side of the sealing gasket is provided with an embedded mounting structure. The end face of the connecting part is provided with a mounting groove adapted to the embedded mounting structure. The sealing gasket is fixed to the connecting part by the cooperation between the embedded mounting structure and the mounting groove.

3. A rotary vane vacuum pump gas inlet assembly according to claim 2, wherein, The sealing gasket is made of rubber. When the connection part is connected to the air inlet, the sealing gasket is in a state of axial compression and radial extension deformation.

4. A sliding vane vacuum pump gas inlet assembly according to claim 1, wherein, The graded filter element includes a coarse filter screen, a fine filter screen, and a support frame arranged sequentially from top to bottom. The coarse filter screen has a pore size of 80-120 mesh, and the fine filter screen has a pore size of 200-300 mesh. The inner wall of the filter chamber is provided with a positioning step, and the support frame abuts against the positioning step. The port of the filter chamber is provided with a retaining spring for limiting the graded filter element.

5. A sliding vane vacuum pump gas inlet assembly according to claim 1, wherein, The inner wall of the gradually expanding channel of the air inlet is provided with a spiral guide rib. The spiral guide rib extends along the axial direction of the air inlet, and the pitch of the spiral guide rib gradually decreases from the air inlet end to the air outlet end.

6. A sliding vane vacuum pump gas inlet assembly according to claim 1, wherein, The connecting part and the air inlet are detachably connected by a flange structure. The flange structure includes a connecting flange disposed on the outer wall of the connecting part and a docking flange disposed on the surface of the pump body. The connecting flange and the docking flange are fixed by bolts, and an auxiliary sealing gasket is provided between them.

7. A sliding vane vacuum pump gas inlet assembly according to claim 1, wherein, The filter chamber and the air inlet are an integral structure. The side wall of the filter chamber is provided with an observation window, and a transparent acrylic plate is sealed and embedded in the observation window.

8. A sliding vane vacuum pump gas inlet assembly according to claim 1, wherein, The air inlet is provided with a detachable dust cover. The dust cover is connected to the air inlet by a thread, and a vent hole is provided in the center of the dust cover. A dust filter is provided inside the vent hole.

9. A rotary vane vacuum pump, comprising a pump body, an exhaust port formed on the pump body, and a pump cavity provided inside the pump body, wherein an eccentrically installed rotor is arranged in the pump cavity, and a rotary vane is slidably connected to the rotor, characterized in that, The pump body has an air inlet that communicates with the pump chamber, and the air inlet is provided with a rotary vane vacuum pump air inlet assembly as described in any one of claims 1-8.

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