Roots vacuum pump with noise reduction structure

Abstract

The utility model relates to a Roots vacuum pump with a noise reduction structure, and relates to the technical field of Roots vacuum pumps, the Roots vacuum pump comprises a bottom plate and a vacuum pump body arranged on the bottom plate, a sound insulation plate is arranged on the bottom plate, a sound insulation box is further arranged on the bottom plate in a sliding mode, and the end faces, close to each other, of the sound insulation box and the sound insulation plate movably abut against each other. A sound insulation cavity is defined by the sound insulation box, the sound insulation plate and the bottom plate, the vacuum pump body is movably located in the sound insulation cavity, a lug plate is arranged at the end, close to the sound insulation plate, of the sound insulation box and is perpendicular to the peripheral wall of the sound insulation box, the lug plate movably abuts against the side walls, close to each other, of the sound insulation plate, and a locking assembly for fixing the position of the sound insulation box is arranged on the bottom plate. The sound insulation plate is provided with a clamping and fixing assembly which enables the sound insulation plate to abut against the lug plate. The soundproof box has the effects that the fixing tightness of the soundproof box and the soundproof plate is improved, and the noise reduction effect is improved.

Description

Technical Field

[0001] This application relates to the technical field of Roots vacuum pumps, and in particular to a Roots vacuum pump with a noise reduction structure. Background Art

[0002] A Roots vacuum pump is a rotary variable volume vacuum pump. Its structural feature is that there are two leaf-shaped rotors rotating synchronously in opposite directions in the pump. There are small gaps between the rotors and between the rotors and the inner wall of the pump housing without contacting each other, and the gas is moved through the pushing action of the rotation of the two rotors to achieve air extraction.

[0003] Currently, a Chinese patent document with the publication number CN221033005U discloses a low-noise vacuum pump, which includes a vacuum pump main body and a support frame fixedly connected to the bottom of the vacuum pump main body. The bottom of the support frame is fixedly connected with a bottom plate. A sound insulation board is fixedly installed on the upper surface of the bottom plate. A sound insulation box is also slidably connected to the bottom plate. The end sides of the sound insulation board and the sound insulation box close to each other are movably attached. A threaded column is threadedly connected to the sound insulation box. The axial direction of the threaded column is perpendicular to the sliding direction of the sound insulation box. A fourth threaded groove is opened on the bottom plate. The threaded column is threadedly connected to the fourth threaded groove. When in use, the technician moves the sound insulation box in the direction close to the sound insulation board. When the threaded column corresponds to the fourth threaded groove, the end sides of the sound insulation box and the sound insulation board close to each other are attached. Then the technician rotates the connecting column to threadedly connect the threaded column and the fourth threaded groove to fix the sound insulation box. When the vacuum pump main body operates, a closed sound insulation space is formed between the sound insulation board and the sound insulation box to reduce the noise inside the device.

[0004] In view of the above related technologies, when in use, the fastening force of the threaded column on the sound insulation box is only in the vertical direction, and it is not easy to make the sound insulation box abut tightly against the sound insulation board. At the same time, when the vacuum pump main body vibrates during operation, the single-sided fixation easily causes the threaded column to gradually loosen or even break, resulting in unstable fixation of the sound insulation box and the sound insulation board, reducing the tightness of the fixation between the sound insulation board and the sound insulation box, and reducing the noise reduction effect. Summary of the Utility Model

[0005] In order to improve the tightness of the fixation between the sound insulation box and the sound insulation board and enhance the noise reduction effect, this application provides a Roots vacuum pump with a noise reduction structure.

[0006] The Roots vacuum pump with a noise reduction structure provided by this application adopts the following technical solutions:

[0007] A Roots vacuum pump with a noise reduction structure, comprising a bottom plate and a vacuum pump body disposed on the bottom plate. A sound insulation board is provided on the bottom plate, and a sound insulation box is slidably disposed on the bottom plate. The end faces of the sound insulation box and the sound insulation board that are close to each other are in movable abutment. The sound insulation box, the sound insulation board, and the bottom plate enclose a sound insulation cavity. The vacuum pump body is movably located in the sound insulation cavity. An ear plate is provided at one end of the sound insulation box close to the sound insulation board. The ear plate is arranged perpendicular to the outer peripheral wall of the sound insulation box, and the side walls of the ear plate and the sound insulation board that are close to each other are in movable abutment. A locking component for fixing the position of the sound insulation box is provided on the bottom plate, and a clamping component for pressing the sound insulation board against the ear plate is provided on the sound insulation board.

[0008] The clamping component includes clamping rods rotatably arranged on the side wall of the sound insulation board. There are two groups of clamping rods, and the two groups of clamping rods are arranged oppositely. One end of the clamping rod is in movable abutment with the side wall of the ear plate away from the sound insulation board. Two guiding rods are provided on the end side of the sound insulation board away from the sound insulation box. The two guiding rods correspond to the two groups of clamping rods one by one. A sliding block is slidably arranged on the guiding rod. The sliding direction of the sliding block is perpendicular to the rotation axis direction of the clamping rod. A connecting rod is rotatably arranged on the sliding block. One end of the connecting rod away from the sliding block is rotatably connected to the clamping rod. A driving member for driving the two sliding blocks to slide synchronously is provided on the sound insulation board.

[0009] By adopting the above technical solution, during use, the technician pushes the sound insulation box to slide towards the sound insulation board until the sound insulation box fits with the sound insulation board, so that the vacuum pump body is located in the sound insulation cavity, realizing noise reduction during the operation of the vacuum pump body. By setting the driving member to drive the two sliding blocks to slide synchronously towards the sound insulation board, driving the connecting rod and the clamping rod to rotate and making the clamping rod press against the ear plate, realizing the pressing of the sound insulation board against the sound insulation box, thereby realizing the fixation of the sound insulation board and the sound insulation box, improving the tightness of the fixation of the sound insulation box and the sound insulation board, and improving the noise reduction effect.

[0010] During maintenance, the technician separates the sound insulation box from the sound insulation board and pushes the sound insulation box to slide away from the sound insulation board, leaving a space for maintaining the vacuum pump body, and fixing the sound insulation box and the bottom plate through the provided locking component, which is convenient for the technician to maintain.

[0011] Optionally, the driving member includes a mounting post provided on the side wall of the sound insulation board away from the sound insulation box. A synchronous plate is penetrated and slidably arranged on the mounting post. Both sliding blocks are connected to the synchronous plate. A tightening nut is coaxially threaded on the mounting post, and the tightening nut is in movable abutment with the side of the synchronous plate away from the sound insulation board.

[0012] By adopting the above technical solution, when fixing the sound insulation board and the sound insulation box, the technician rotates the tightening nut, and the tightening nut tightens and drives the synchronous plate to slide towards the sound insulation board, and the synchronous plate drives the two sliding blocks to slide synchronously, realizing the fixation of the sound insulation board and the sound insulation box, which is convenient for the technician to operate.

[0013] Optionally, the locking assembly includes a fixing rod provided on the sound insulation box. The fixing rod is located on the side of the sound insulation box away from the sound insulation board. A locking column is provided on the fixing rod. The end of the locking column away from the sound insulation box is hemispherical. A locking groove for the locking column to be inserted into is formed on the bottom plate. A plurality of locking blocks are slidably arranged on the bottom plate. The plurality of locking blocks are evenly arranged at intervals along the circumferential direction of the inner peripheral wall of the locking groove. The end of the locking block close to the axis of the locking groove is sharp. The inclined side of the locking block is in movable abutment with the hemispherical surface of the locking column. The side wall of the locking block away from the bottom wall of the locking groove is in movable fit with the side wall of the locking column close to the fixing rod. An elastic member is provided on the other side of the locking block, and the elastic member always makes the locking block slide towards the direction close to the axis of the locking groove.

[0014] By adopting the above technical solution, during maintenance, the technician separates the sound insulation box from the sound insulation board and pushes the sound insulation box to slide away from the sound insulation board, so that the locking column slides towards the direction close to the locking groove and is inserted into the locking groove, making the hemispherical surface of the locking column abut against the inclined sides of the plurality of locking blocks, and making the plurality of locking blocks slide synchronously away from the axis of the locking groove until the technician hears a "click" sound. At this time, the side wall of the locking block away from the bottom wall of the locking groove is flush with the side wall of the locking column close to the fixing rod. The elastic member drives the locking block to slide towards the direction close to the axis of the locking groove, and makes the side wall of the locking block away from the bottom wall of the locking groove fit with the side wall of the locking column close to the fixing rod, so that the locking column and the locking groove are not easily separated, which is convenient for the technician to fix the sound insulation box and the bottom plate.

[0015] Optionally, the locking assembly further includes a reset ring slidably arranged coaxially on the fixing rod. The reset ring is in movable abutment with the side walls of the sound insulation box close to each other. The outer peripheral wall of the reset ring is sharp. The inclined side of the reset ring close to the sound insulation box is in movable abutment with the inclined side of the locking block close to the bottom wall of the locking groove. The other inclined side of the reset ring is in movable abutment with the inclined side of the locking block away from the bottom wall of the locking groove. A receiving groove is formed on the locking column. The reset ring is movably located in the receiving groove, and the inclined side of the reset ring away from the locking column always protrudes from the receiving groove. A reset structure for making the reset ring slide away from the receiving groove is provided on the reset ring.

[0016] By adopting the above technical solution, when unlocking the sound insulation box and the bottom plate, the technician continues to push the sound insulation box to slide, driving the locking column to continue sliding in the direction close to the bottom wall of the locking groove, so that the inclined side of the reset ring away from the sound insulation box abuts against the inclined side of the locking block away from the bottom wall of the locking groove. At the same time, the side walls of the reset ring and the sound insulation box close to each other are abutted tightly, causing the locking block to slide in the direction away from the axis of the locking groove until the technician hears a "click" sound again. At this time, the other inclined side of the reset ring is flush with the inclined side of the locking block close to the bottom wall of the locking groove, and the elastic member drives the locking block to slide in the direction close to the axis of the locking groove, and makes the inclined side of the locking block close to the bottom wall of the locking groove abut tightly against the inclined side of the reset ring close to the sound insulation box;

[0017] Then the technician pushes the sound insulation box to slide, driving the locking column to slide in the direction away from the bottom wall of the locking groove. Since the locking block abuts against the reset ring and restricts the synchronous sliding of the reset ring and the fixing rod, the locking column slides in the direction close to the reset ring, so that the reset ring is located in the receiving groove. The locking column continues to slide, making the inclined side of the reset ring protruding from the receiving groove abut against the inclined side of the locking block close to the bottom wall of the locking groove, and causing the locking block to slide in the direction away from the axis of the locking groove until the inclined side of the locking block away from the bottom wall of the locking groove abuts tightly against the hemispherical surface of the locking column and gradually separates from the hemispherical surface of the locking column, realizing the separation of the locking column and the locking groove, thereby realizing the unlocking of the sound insulation box and the bottom plate. The unlocking operation is convenient and fast. At the same time, the set reset structure makes the reset ring slide in the direction away from the receiving groove, realizing the separation of the reset ring and the receiving groove, which is convenient for fixing the sound insulation box and the bottom plate next time.

[0018] Optionally, a pressing block is slidably arranged in the locking groove. The pressing block is arranged coaxially with the locking groove. The side wall of the pressing block away from the bottom wall of the locking groove is movably abutted against the hemispherical surface of the locking column. A pressing spring is arranged on the other side of the pressing block. The pressing spring always makes the pressing block slide in the direction away from the bottom wall of the locking groove.

[0019] By adopting the above technical solution, when fixing the sound insulation box and the bottom plate, the side wall of the locking block away from the bottom wall of the locking groove is attached to the side wall of the locking column close to the fixing rod. The pressing spring drives the pressing block to slide in the direction away from the bottom wall of the locking groove, and makes the side wall of the pressing block away from the bottom wall of the locking groove abut against the hemispherical surface of the locking column, so that the side wall of the locking column close to the fixing rod abuts tightly against the side wall of the locking block away from the bottom wall of the locking groove, increasing the stability of the fixation of the sound insulation box and the bottom plate;

[0020] When the sound insulation box and the base plate are unlocked, the locking column has space to continue sliding toward the bottom wall of the locking groove through the provided clamping spring, which is convenient for the technician to disassemble the sound insulation box and the base plate. When the technician slides the sound insulation box away from the sound insulation board, so that the inclined side of the locking block close to the bottom wall of the locking groove is pressed against the inclined side of the reset ring close to the sound insulation box, the technician releases the sound insulation box, and the clamping spring can be used to make the clamping block press against the locking column, and drive the locking column to slide in the direction away from the bottom wall of the locking groove, so as to separate the locking column from the locking groove, thereby unlocking the sound insulation box and further improving the convenience of unlocking the sound insulation box and the base plate.

[0021] Optionally, a thread is provided at one end of the mounting post close to the sound insulation board, and a limit block is provided at one end of the mounting post away from the sound insulation board. The limit block is movably fitted with a side of the locking nut away from the synchronous plate, and a push spring is provided at one end of the synchronous plate away from the locking nut, and the push spring always causes the synchronous plate to slide in a direction close to the limit block.

[0022] By adopting the above technical solution, when fixing the sound insulation board and the sound insulation box, the technician makes the sound insulation box fit with the sound insulation board, and then the technician presses the abutting nut and the synchronous plate by hand and screws the abutting nut into the mounting column, so that the sliding block slides quickly and drives the connecting rod and the clamping rod to rotate, so that the clamping rod quickly approaches the ear plate, and then the technician rotates the abutting nut to drive the synchronous plate and the sliding block to continue to slide in the direction close to the sound insulation board, so that the sound insulation board and the sound insulation box are closely fitted, thereby achieving the fixation of the sound insulation board and the sound insulation box, which is convenient for the rapid fixation of the sound insulation board and the sound insulation box;

[0023] When unlocking the sound insulation board and the sound insulation box, the technician rotates the locking nut, and the locking nut moves away from the sound insulation board. At this time, the push spring drives the synchronous plate and the sliding block to slide away from the sound insulation board, thereby unlocking the sound insulation board and the sound insulation box, until the locking nut is separated from the threads on the mounting column. The push spring drives the synchronous plate and the locking nut to slide quickly away from the sound insulation board, thereby enabling the clamping rod to quickly move away from the ear plate, making it difficult for the clamping rod to hinder the sound insulation box from sliding away from the sound insulation board, thereby facilitating the rapid separation of the sound insulation board and the sound insulation box. At the same time, the limit block set makes it difficult for the locking nut to detach from the mounting column, thereby making it difficult for the locking nut to be lost.

[0024] Optionally, air inlet pipes and air outlet pipes are symmetrically arranged on the vacuum pump body. Silencers are arranged on both the air inlet pipes and the air outlet pipes. Installation holes for communicating the silencers with the outside of the sound insulation cavity are formed in the sound insulation board. Positioning grooves are formed in the inner peripheral wall of the installation holes. Positioning plates are arranged in the positioning grooves, and the size of the positioning grooves is larger than that of the positioning plates. One end of the silencer away from the vacuum pump body is detachably connected to the positioning plate, and connection holes communicating with the silencer are formed in the positioning plate.

[0025] By adopting the above technical solution, when fixing the positioning plate of the silencer, since the positioning plate is located in the positioning groove and the size of the positioning groove is larger than that of the positioning plate, it is convenient for technicians to fix the silencer. When the vacuum pump body vibrates during operation, it is not easy to affect the sound insulation board. When the silencer is connected to other equipment through the connection hole, the positioning plate blocks the installation hole, improving the noise reduction effect.

[0026] Optionally, a buffer pad is arranged at the connection between the vacuum pump body and the bottom plate. The buffer pad abuts against the side of the vacuum pump body close to the bottom plate, and the buffer pad is a rubber pad.

[0027] By adopting the above technical solution, when fixing the vacuum pump body and the bottom plate, the technician places the buffer pad on the bottom plate, then places the vacuum pump body on the buffer pad, and fixes the vacuum pump body and the bottom plate. By providing the buffer pad, the noise generated by the vibration of the vacuum pump body during operation is reduced.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. By providing the bottom plate, the vacuum pump body, the sound insulation board, the sound insulation box, the ear plate, the clamping rod, the guide rod, the sliding block, the connecting rod and the driving member, during use, the technician pushes the sound insulation box to fit with the sound insulation board. At this time, the vacuum pump body is located in the sound insulation cavity surrounded by the sound insulation board, the sound insulation box and the bottom plate, realizing noise reduction when the vacuum pump body operates. By driving the two sliding blocks to slide synchronously along the guide rod through the driving member, the connecting rod and the clamping rod are driven to rotate and the clamping rod abuts against the ear plate, realizing that the sound insulation board abuts against the sound insulation box, thereby realizing the fixation of the sound insulation board and the sound insulation box, improving the tightness of the fixation of the sound insulation box and the sound insulation board, and improving the noise reduction effect;

[0030] 2. Through the provided fixed rod, locking column, locking block, elastic member, reset ring and reset structure, a locking groove for the locking column to movably insert is formed on the bottom plate. A receiving groove is formed on the locking column. During maintenance, the technician separates the sound insulation box from the sound insulation board and pushes the sound insulation box to slide away from the sound insulation board, so that the locking column is inserted into the locking groove. The hemispherical surface of the locking column abuts against multiple locking blocks, and the locking blocks slide synchronously towards the axis of the locking groove until the technician hears a "click" sound. At this time, the side wall of the locking block away from the bottom wall of the locking groove is flush with the side wall of the locking column close to the fixed rod. The elastic member drives the locking block to slide towards the axis of the locking groove, and the side wall of the locking block away from the bottom wall of the locking groove fits with the side wall of the locking column close to the fixed rod, so that the locking column and the locking groove are not easily separated, facilitating the technician to fix the sound insulation box and the bottom plate, and facilitating maintenance at the same time.

[0031] When unlocking the sound insulation box and the bottom plate, the technician continues to push the sound insulation box to slide, driving the locking column to continue to slide towards the bottom wall of the locking groove, making the inclined side of the reset ring away from the sound insulation box abut against the inclined side of the locking block away from the bottom wall of the locking groove, and making the locking block slide away from the axis of the locking groove until the technician hears a "click" sound again. At this time, the other inclined side of the reset ring is flush with the inclined side of the locking block close to the bottom wall of the locking groove. The elastic member drives the locking block to slide towards the axis of the locking groove, and the inclined side of the locking block close to the bottom wall of the locking groove abuts tightly against the inclined side of the reset ring close to the sound insulation box;

[0032] Then the technician pushes the sound insulation box to slide, driving the locking column to slide away from the bottom wall of the locking groove. Since the locking block abuts against the reset ring and restricts the synchronous sliding of the reset ring and the fixed rod, the locking column slides towards the reset ring, so that the reset ring is located in the receiving groove. The locking column continues to slide, making the inclined side of the reset ring protruding from the receiving groove abut against the inclined side of the locking block close to the bottom wall of the locking groove, and making the locking block slide away from the axis of the locking groove until the inclined side of the locking block away from the bottom wall of the locking groove abuts tightly against the hemispherical surface of the locking column and gradually separates from the hemispherical surface of the locking column, realizing the separation of the locking column and the locking groove, thereby realizing the unlocking of the sound insulation box and the bottom plate. The unlocking operation is convenient and fast. At the same time, the provided reset structure makes the reset ring slide away from the receiving groove, realizing the separation of the reset ring and the receiving groove, facilitating the next fixation of the sound insulation box and the bottom plate.

[0033] 3. Through the provided air inlet pipe, air outlet pipe, muffler and positioning plate, when fixing the muffler, the technician connects the muffler with the positioning plate. Since the positioning plate is in the positioning groove and the size of the positioning groove is larger than that of the positioning plate, when the vacuum pump body vibrates during operation, it is not easy to affect the sound insulation board. When the muffler is connected to other equipment through the connection hole, the positioning plate seals the sound insulation cavity, improving the noise reduction effect. Description of the Drawings

[0034] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0035] Figure 2 It is a schematic diagram of the connection structure between the sound insulation board and the sound insulation box;

[0036] Figure 3 It is a schematic diagram of the connection structure between the locking column and the locking block;

[0037] Figure 4 is Figure 2 a partial enlarged schematic diagram of part A in

[0038] Reference numerals: 1, bottom plate; 11, sound insulation board; 111, mounting hole; 112, positioning groove; 12, sound insulation box; 13, sound insulation cavity; 14, ear plate; 15, support frame; 2, vacuum pump body; 21, air inlet pipe; 22, air outlet pipe; 23, support feet; 24, buffer pad; 3, locking assembly; 31, fixing rod; 32, locking column; 321, receiving groove; 33, locking groove; 34, locking block; 35, elastic member; 36, reset ring; 37, reset structure; 371, magnetic attraction ring; 38, abutting block; 39, abutting spring; 4, clamping assembly; 41, clamping rod; 42, guide rod; 43, sliding block; 44, connecting rod; 45, driving member; 451, mounting column; 452, synchronous plate; 453, abutting nut; 454, limiting block; 455, pushing spring; 5, muffler; 6, positioning plate; 61, connecting hole. Detailed implementation manners

[0039] The following will Figures 1-4 further describe the present application in detail with reference to the attached

[0040] An embodiment of the present application discloses a Roots vacuum pump with a noise reduction structure. Refer to Figure 1 and Figure 2, A Roots vacuum pump with a noise reduction structure includes a bottom plate 1 horizontally arranged on the ground and a support frame 15 fixed on the bottom plate 1. The bottom plate 1 is rectangular in shape. At the top of the support frame 15, a vacuum pump body 2 is installed. At the bottom of the vacuum pump body 2, four support feet 23 are fixed. The support feet 23 are connected to the support frame 15 by bolts, and buffer pads 24 are fixed on the side walls of the support feet 23 and the support frame 15 that are close to each other. The buffer pads 24 are in tight contact with the support feet 23 and the support frame 15 respectively. The buffer pads 24 are rubber pads. The axis of the motor of the vacuum pump body 2 is parallel to the length direction of the bottom plate 1. A sound insulation board 11 is fixed on the top of the bottom plate 1, and the sound insulation board 11 is perpendicular to the axis direction of the motor of the vacuum pump body 2. A sound insulation box 12 is also slidably connected to the top of the bottom plate 1. The sound insulation box 12 slides along the length direction of the bottom plate 1. The end faces of the sound insulation box 12 and the sound insulation board 11 that are close to each other are in movable contact. The bottom end of the sound insulation box 12 and one end of the sound insulation box 12 close to the sound insulation board 11 are both open. The sound insulation box 12, the sound insulation board 11, and the bottom plate 1 enclose a closed sound insulation cavity 13. The vacuum pump body 2 is movably located in the sound insulation cavity 13. An ear plate 14 is fixed at one end of the sound insulation box 12 close to the sound insulation board 11. The ear plate 14 is arranged perpendicular to the outer side wall of the sound insulation box 12, and the side walls of the ear plate 14 and the sound insulation board 11 that are close to each other are in movable contact.

[0041] To improve the tightness of the fixation between the sound insulation box 12 and the sound insulation board 11 and enhance the noise reduction effect, a clamping component 4 is provided on the sound insulation board 11 to make the sound insulation board 11 and the ear plate 14 in tight contact. Refer to Figure 1 and Figure 2 , the clamping component 4 includes a clamping rod 41 rotatably connected to the side wall of the sound insulation board 11. The rotation axis of the clamping rod 41 is located in the middle of the clamping rod 41, and the rotation axis of the clamping rod 41 is arranged vertically. The clamping rod 41 is in an "L" shape. The large head end of the clamping rod 41 is in movable contact with the side wall of the ear plate 14 away from the sound insulation board 11. There are two groups of clamping rods 41, and the two groups of clamping rods 41 are arranged opposite to each other along the width direction of the bottom plate 1. To improve the stability of the fixation between the sound insulation box 12 and the sound insulation board 11, each group of clamping rods 41 includes two clamping rods 41 arranged opposite to each other along the vertical direction. Two groups of guide rods 42 are fixed on the end side of the sound insulation board 11 away from the sound insulation box 12. Each group of guide rods 42 includes two guide rods 42. The two groups of guide rods 42 correspond to the two groups of clamping rods 41 one by one. A sliding block 43 is slidably connected to the guide rod 42. The sliding direction of the sliding block 43 is perpendicular to the rotation axis direction of the clamping rod 41 and parallel to the length direction of the bottom plate 1. A connecting rod 44 is rotatably connected to the sliding block 43. The end of the connecting rod 44 away from the sliding block 43 is rotatably connected to the end of the clamping rod 41 away from the large head end. The rotation axis of the connecting rod 44 is parallel to the rotation axis of the clamping rod 41.

[0042] To drive the two groups of sliding blocks 43 to slide synchronously and facilitate the operation of technicians, a driving member 45 is also provided on the sound insulation board 11. Refer to Figure 1, the driving member 45 includes a mounting post 451 fixed to the side wall of the sound insulation board 11 away from the sound insulation box 12. A synchronous plate 452 is penetrated and slidably connected to the mounting post 451. Both groups of sliding blocks 43 are fixedly connected to the synchronous plate 452. The sliding direction of the synchronous plate 452 is consistent with the sliding direction of the sliding blocks 43. The mounting post 451 is coaxially threadedly connected with a tightening nut 453, and the tightening nut 453 is movably abutted against the side of the synchronous plate 452 away from the sound insulation board 11.

[0043] For the convenience of quickly fixing / unlocking the sound insulation board 11 and the sound insulation box 12, refer to Figure 1 , one end of the mounting post 451 close to the sound insulation board 11 is provided with a thread. A limiting block 454 is fixed to the end of the mounting post 451 away from the sound insulation board 11. The limiting block 454 is movably attached to the side of the tightening nut 453 away from the synchronous plate 452. A pushing spring 455 is provided at the end of the synchronous plate 452 away from the tightening nut 453, and the pushing spring 455 always makes the synchronous plate 452 slide towards the direction close to the limiting block 454.

[0044] During use, the technician pushes the sound insulation box 12 to slide along the length direction of the bottom plate 1 towards the direction close to the sound insulation board 11 until the sound insulation box 12 is attached to the sound insulation board 11. At this time, the vacuum pump body 2 is located in the sound insulation cavity 13, reducing the noise generated when the vacuum pump body 2 works. At the same time, due to the provided buffer pad 24, the noise generated by the vibration of the vacuum pump body 2 is reduced;

[0045] Then, the technician presses the tightening nut 453 and the synchronous plate 452 by hand and screws the tightening nut 453 into the mounting post 451, driving the two groups of sliding blocks 43 to slide synchronously towards the direction close to the sound insulation board 11 quickly, and driving the connecting rod 44 and the clamping rod 41 to rotate, so that the large head end of the clamping rod 41 quickly approaches the ear plate 14. Then, the technician rotates the tightening nut 453. The tightening nut 453 abuts and drives the synchronous plate 452 to continue sliding towards the direction close to the sound insulation board 11, and drives the two groups of sliding blocks 43 to slide synchronously, so that the connecting rod 44 and the clamping rod 41 continue to rotate, so that the large head end of the clamping rod 41 abuts against the ear plate 14, realizing the abutment of the sound insulation board 11 and the sound insulation box 12, thus realizing the fixation of the sound insulation board 11 and the sound insulation box 12, improving the tightness of the fixation of the sound insulation box 12 and the sound insulation board 11, and improving the noise reduction effect.

[0046] During maintenance, the technician rotates the tightening nut 453, and the tightening nut 453 moves away from the sound insulation board 11. At this time, the pushing spring 455 drives the synchronous plate 452 and the sliding block 43 to slide away from the sound insulation board 11, realizing the separation of the large head end of the clamping rod 41 from the ear plate 14, thereby unlocking the sound insulation board 11 and the sound insulation box 12 until the tightening nut 453 is separated from the thread on the mounting post 451. The pushing spring 455 continues to drive the synchronous plate 452 and the tightening nut 453 to slide rapidly away from the sound insulation board 11, realizing the rapid separation of the large head end of the clamping rod 41 from the ear plate 14, making it difficult for the clamping rod 41 to obstruct the sliding of the sound insulation box 12. Then, the technician can push the sound insulation box 12 to slide away from the sound insulation board 11 to achieve the rapid separation of the sound insulation board 11 and the sound insulation box 12. At the same time, the limit block 454 makes it difficult for the tightening nut 453 to detach from the mounting post 451, preventing the tightening nut 453 from being lost.

[0047] Furthermore, in order to fix the sound insulation box 12 and the bottom plate 1 during maintenance, a locking assembly 3 is provided on the bottom plate 1. Refer to Figure 2 and Figure 3 The locking assembly 3 includes a fixing rod 31 fixed on the side wall of the sound insulation box 12 away from the sound insulation board 11. A locking post 32 is coaxially fixed on the fixing rod 31. The locking post 32 is cylindrical and the end of the locking post 32 away from the sound insulation box 12 is hemispherical. A locking groove 33 for the locking post 32 to be inserted into is formed on the bottom plate 1. A plurality of locking blocks 34 are slidably connected to the bottom plate 1. The plurality of locking blocks 34 are arranged at equal intervals along the circumference of the inner wall of the locking groove 33. The locking blocks 34 slide in a direction perpendicular to the axis of the locking groove 33. The end of the locking block 34 close to the axis of the locking groove 33 is sharp. The inclined side of the locking block 34 is in active contact with the hemispherical surface of the locking post 32. The side wall of the locking block 34 away from the bottom wall of the locking groove 33 is in active contact with the side wall of the locking post 32 close to the fixing rod 31. An elastic member 35 is fixedly connected to the side of the locking block 34 away from the axis of the locking groove 33. The elastic member 35 always makes the locking block 34 slide towards the axis of the locking groove 33. In this application, the elastic member 35 is a compression spring. In this application, four locking blocks 34 are provided. In other embodiments, the number of locking blocks 34 can also be three, five, six, etc. The arrangement method is the same as that in this application.

[0048] Furthermore, in order to facilitate the unlocking of the sound insulation box 12 and the bottom plate 1, refer to Figure 2 and Figure 3, the locking assembly 3 further includes a reset ring 36 coaxially and slidably connected to the fixed rod 31. The reset ring 36 is movably abutted against the side walls of the sound insulation box 12 close to each other. The outer peripheral wall of the reset ring 36 is sharp. The outer diameters of the opposite side walls of the reset ring 36 along its axial direction are smaller than the outer diameter of the middle part of the reset ring 36, and the outer diameter of the reset ring 36 gradually and smoothly increases along the axial direction of the reset ring 36 from the middle part of the reset ring 36. The inclined side of the reset ring 36 close to the sound insulation box 12 is movably abutted against the inclined side of the locking block 34 close to the bottom wall of the locking groove 33, and the other inclined side of the reset ring 36 is movably abutted against the inclined side of the locking block 34 away from the bottom wall of the locking groove 33. A receiving groove 321 is formed on the locking column 32, and the reset ring 36 is movably located in the receiving groove 321. The inclined side of the reset ring 36 away from the locking column 32 always protrudes from the receiving groove 321. When the reset ring 36 is located in the receiving groove 321, the inclined side of the reset ring 36 protruding from the receiving groove 321 abuts against the inclined side of the locking block 34 close to the bottom wall of the locking groove 33 and drives the locking block 34 to slide away from the axis of the locking groove 33. When the inclined side of the reset ring 36 protruding from the receiving groove 321 is separated from the inclined side of the locking block 34 close to the bottom wall of the locking groove 33, the inclined side of the locking block 34 close to the bottom wall of the locking groove 33 abuts against the locking column 32 tightly. In order to prevent the locking block 34 and the reset ring 36 from scratching the technicians easily, chamfering treatment is carried out on the sharp ends of the locking block 34 and the reset ring 36.

[0049] In order to facilitate the fixation of the sound insulation box 12 and the bottom plate 1 next time, a reset structure 37 for sliding the reset ring 36 away from the receiving groove 321 is provided on the reset ring 36. The reset structure 37 includes magnetic attraction rings 371 fixed on the side walls of the reset ring 36 and the sound insulation box 12 close to each other. The two magnetic attraction rings 371 are magnetically connected and are both arranged coaxially with the fixed rod 31.

[0050] In order to increase the stability of the fixation of the sound insulation box 12 to the bottom plate 1, referring to Figure 2 and Figure 3 , a pressing block 38 is slidably connected in the locking groove 33. The pressing block 38 is arranged coaxially with the locking groove 33. The pressing block 38 slides along the axial direction of the locking groove 33, and the side wall of the pressing block 38 away from the bottom wall of the locking groove 33 is movably abutted against the hemispherical surface of the locking column 32. A pressing spring 39 is fixed on the other side of the pressing block 38, and the pressing spring 39 always makes the pressing block 38 slide away from the bottom wall of the locking groove 33.

[0051] During maintenance, the technician separates the sound insulation board 11 from the sound insulation box 12 and pushes the sound insulation box 12 to slide away from the sound insulation board 11, driving the locking column 32 to slide towards the locking groove 33 and insert into the locking groove 33. The hemispherical surface of the locking column 32 abuts against the inclined sides of the four locking blocks 34, and the four locking blocks 34 slide synchronously away from the axis of the locking groove 33. At the same time, the hemispherical surface of the locking column 32 abuts against the abutting block 38 and drives the abutting block 38 to slide towards the bottom wall of the locking groove 33, compressing the abutting spring 39 until the technician hears a "click" sound. At this time, the side wall of the locking block 34 away from the bottom wall of the locking groove 33 is flush with the side wall of the locking column 32 close to the fixing rod 31. The elastic member 35 drives the locking block 34 to slide towards the axis of the locking groove 33, and the side wall of the locking block 34 away from the bottom wall of the locking groove 33 fits with the side wall of the locking column 32 close to the fixing rod 31, so that the locking column 32 and the locking groove 33 are not easily separated, facilitating the technician to fix the sound insulation box 12 and the bottom plate 1;

[0052] At the same time, the compressed abutting spring 39 makes the abutting block 38 abut and drives the locking column 32 to slide away from the bottom wall of the locking groove 33, so that the side wall of the locking block 34 away from the bottom wall of the locking groove 33 abuts against the side wall of the locking column 32 close to the fixing rod 31, increasing the stability of the fixation of the sound insulation box 12 and the bottom plate 1.

[0053] When unlocking the sound insulation box 12 and the bottom plate 1, the technician continues to push the sound insulation box 12 to slide, driving the locking column 32 to continue sliding towards the bottom wall of the locking groove 33, so that the inclined side of the reset ring 36 away from the sound insulation box 12 abuts against the inclined side of the locking block 34 away from the bottom wall of the locking groove 33. At this time, the side walls of the reset ring 36 and the sound insulation box 12 close to each other abut, causing the locking block 34 to slide away from the axis of the locking groove 33. At the same time, the locking column 32 drives the abutting block 38 to compress the abutting spring 39 until the technician hears a "click" sound. At this time, the other inclined side of the reset ring 36 is flush with the inclined side of the locking block 34 close to the bottom wall of the locking groove 33. The elastic member 35 drives the locking block 34 to slide towards the axis of the locking groove 33, and the inclined side of the locking block 34 close to the bottom wall of the locking groove 33 abuts against the inclined side of the reset ring 36 close to the sound insulation box 12;

[0054] Then, the technician loosens the sound insulation box 12. The compressed pressing spring 39 drives the pressing block 38 to press against the locking column 32 and drives the locking column 32 to slide in a direction away from the bottom wall of the locking groove 33. Since the locking block 34 presses against the reset ring 36 and restricts the synchronous sliding of the reset ring 36 and the fixed rod 31, the locking column 32 slides in a direction close to the reset ring 36, so that the reset ring 36 is located in the accommodation groove 321. The locking column 32 continues to slide, causing the reset ring 36 to protrude from the inclined side of the accommodation groove 321 and press against the inclined side of the locking block 34 close to the bottom wall of the locking groove 33, and causing the locking block 34 to slide in a direction away from the axis of the locking groove 33 until the inclined side of the locking block 34 away from the bottom wall of the locking groove 33 abuts against the hemispherical surface of the locking column 32 and gradually separates from the hemispherical surface of the locking column 32, realizing the separation of the locking column 32 from the locking groove 33, thereby realizing the unlocking of the sound insulation box 12 from the bottom plate 1. The unlocking operation is convenient and fast;

[0055] Then, through the action of the two magnetic attraction rings 371, the reset ring 36 is driven to slide in a direction away from the accommodation groove 321 until the reset ring 36 abuts against the side wall of the sound insulation box 12 close to each other, realizing the separation of the reset ring 36 from the accommodation groove 321, which is convenient for fixing the sound insulation box 12 and the bottom plate 1 next time.

[0056] Furthermore, in order to reduce the noise generated when the vacuum pump body 2 intakes / outtakes air, referring to Figure 2 and Figure 4 , an air inlet pipe 21 and an air outlet pipe 22 are symmetrically and fixedly arranged on the vacuum pump body 2 along the vertical direction. A muffler 5 is fixedly arranged on both the air inlet pipe 21 and the air outlet pipe 22 through flanges. In this application, the muffler 5 is a pipe muffler 5. An installation hole 111 for the muffler 5 to communicate with the outside of the sound insulation cavity 13 is opened on the sound insulation board 11. A positioning groove 112 is opened on the inner peripheral wall of the installation hole 111. A positioning plate 6 is arranged in the positioning groove 112. The positioning plate 6 is in the shape of a circular plate. The positioning groove 112 is in the shape of an arc adapted to the positioning plate 6, and the diameter of the positioning plate 6 is larger than the diameter of the positioning groove 112. The two side walls of the positioning plate 6 perpendicular to the length direction of the bottom plate 1 are movably attached to the inner side wall of the positioning groove 112. One end of the muffler 5 away from the vacuum pump body 2 is fixedly connected to the positioning plate 6 through a flange. A connection hole 61 communicating with the muffler 5 is also opened on the positioning plate 6.

[0057] When the vacuum pump works, the provided muffler 5 reduces the noise generated when the vacuum pump body 2 intakes / outtakes air. When fixing the muffler 5 and the positioning plate 6, since the positioning plate 6 slides along the inner side wall of the positioning groove 112 in the positioning groove 112, it is convenient for the technician to fix the muffler 5 and the positioning plate 6. When the vacuum pump body 2 vibrates during operation, it is not easy to affect the sound insulation board 11. When the muffler 5 is connected to other equipment through the installation hole 111, the positioning plate 6 blocks the installation hole 111, improving the noise reduction effect.

[0058] The implementation principle of a Roots vacuum pump with a noise reduction structure in an embodiment of this application is as follows: During use, a technician slides the sound insulation box 12 to make it fit with the sound insulation board 11, so that the vacuum pump body 2 is located in the sound insulation cavity 13, reducing the noise generated when the vacuum pump body 2 operates. At the same time, through the provided buffer pad 24, the noise generated by the vibration of the vacuum pump body 2 is reduced. The noise of the intake pipe / outlet pipe of the vacuum pump body 2 is reduced through the provided muffler 5. By the positioning plate 6 movably connected to the sound insulation board 11, the influence of the vibration of the vacuum pump body 2 during operation on the sound insulation board 11 is reduced. When the muffler 5 is connected to other equipment, the installation hole 111 is blocked to improve the noise reduction effect.

[0059] Then, the technician presses the tightening nut 453 and the synchronous plate 452 by hand and screws the tightening nut 453 into the mounting post 451, driving the two groups of sliding blocks 43 to slide synchronously, thereby driving the connecting rod 44 and the clamping rod 41 to rotate. Furthermore, the large head end of the clamping rod 41 quickly approaches the ear plate 14. Then, the technician rotates the tightening nut 453. The tightening nut 453 presses and drives the synchronous plate 452 and the sliding block 43 to continue sliding, causing the connecting rod 44 and the clamping rod 41 to continue rotating, so that the large head end of the clamping rod 41 abuts against the ear plate 14, realizing the abutment between the sound insulation board 11 and the sound insulation box 12, thereby realizing the fixation of the sound insulation board 11 and the sound insulation box 12, improving the tightness of the fixation between the sound insulation box 12 and the sound insulation board 11, and improving the noise reduction effect.

[0060] During maintenance, the technician rotates the tightening nut 453. The tightening nut 453 moves away from the sound insulation board 11. At this time, the top push spring 455 drives the synchronous plate 452 and the sliding block 43 to slide, realizing the separation of the large head end of the clamping rod 41 from the ear plate 14 until the thread of the tightening nut 453 is separated from the mounting post 451. The top push spring 455 drives the synchronous plate 452 and the tightening nut 453 to slide quickly, making the large head end of the clamping rod 41 quickly move away from the ear plate 14. Then, the technician slides the sound insulation box 12 in the direction away from the sound insulation board 11, and the quick separation of the sound insulation board 11 and the sound insulation box 12 can be realized. At the same time, the provided limit block 454 makes it difficult for the tightening nut 453 to be lost.

[0061] Then, the technician slides the sound insulation box 12 to insert the locking post 32 into the locking groove 33. At this time, the locking post 32 drives the four locking blocks 34 to slide synchronously until the technician hears a "click" sound. At this time, the side wall of the locking post 32 close to the sound insulation box 12 fits with the side wall of the locking block 34 close to the bottom wall of the locking groove 33. At the same time, the abutting spring 39 drives the abutting block 38 to abut against the locking post 32, making the side walls of the locking post 32 and the locking block 34 that fit together abut tightly, realizing the fixation of the sound insulation box 12 and the bottom plate 1.

[0062] When unlocking the sound insulation box 12 and the bottom plate 1, the technician continues to push the sound insulation box 12 to slide, so that the locking column 32 continues to slide in the direction close to the bottom wall of the locking groove 33. At this time, the reset ring 36 abuts against the locking block 34 and drives the locking block 34 to slide synchronously until the technician hears a "click" sound. At this time, the other inclined side of the locking column 32 abuts against the other inclined side of the reset ring 36. Then the technician releases the sound insulation box 12, and the abutting spring 39 drives the abutting block 38 to abut against the locking column 32 and drives the locking column 32 to slide in the direction away from the bottom wall of the locking groove 33. At this time, the locking block 34 abuts against the reset ring 36, causing the reset ring 36 to slide relative to the fixed rod 31 until the reset ring 36 is located in the receiving groove 321. The locking column 32 continues to slide, causing the reset ring 36 to abut against the locking block 34 and drive the locking block 34 to slide until the inclined side of the locking block 34 away from the bottom wall of the locking groove 33 abuts against the hemispherical surface of the locking column 32 and gradually separates from the hemispherical surface of the lock, realizing the separation of the locking column 32 and the locking groove 33, thereby realizing the unlocking of the sound insulation box 12 and the bottom plate 1.

[0063] Then, under the action of the two magnetic attraction rings 371, the reset ring 36 is driven to slide in the direction close to the sound insulation box 12 until the reset ring 36 abuts against the side wall of the sound insulation box 12 close to each other, realizing the separation of the reset ring 36 and the receiving groove 321, which is convenient for fixing the sound insulation box 12 and the bottom plate 1 next time.

[0064] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A Roots vacuum pump with a noise reduction structure, comprising a base plate (1) and a vacuum pump body (2) arranged on the base plate (1), characterized in that: A soundproofing plate (11) is provided on the bottom plate (1), and a soundproofing box (12) is also slidably provided on the bottom plate (1). The soundproofing box (12) and the soundproofing plate (11) are movably pressed against each other at their end surfaces close to each other. The soundproofing box (12), the soundproofing plate (11) and the bottom plate (1) together form a soundproofing cavity (13). The vacuum pump body (2) is movably located in the soundproofing cavity (13). The soundproofing box (12) is close to the soundproofing plate. An ear plate (14) is provided at one end of the sound insulation box (11), the ear plate (14) is arranged perpendicular to the outer peripheral wall of the sound insulation box (12), and the ear plate (14) and the side walls of the sound insulation board (11) that are close to each other are movably pressed against each other, the bottom plate (1) is provided with a locking component (3) for fixing the position of the sound insulation box (12), and the sound insulation board (11) is provided with a clamping component (4) for pressing the sound insulation board (11) and the ear plate (14) against each other; The clamping assembly (4) comprises a clamping rod (41) rotatably arranged on the side wall of the sound insulation board (11), the clamping rod (41) being provided with two groups, the two groups of the clamping rods (41) being arranged opposite to each other, one end of the clamping rod (41) being movably pressed against the side wall of the ear plate (14) away from the sound insulation board (11), and two groups of guide rods (42) being provided on the end side of the sound insulation board (11) away from the sound insulation box (12), the two groups of guide rods (42) and the two groups of clamping rods (41) being rotatably pressed against each other. ) correspond one to one, a sliding block (43) is slidably arranged on the guide rod (42), the sliding direction of the sliding block (43) is perpendicular to the rotation axis direction of the clamping rod (41), a connecting rod (44) is rotatably arranged on the sliding block (43), one end of the connecting rod (44) away from the sliding block (43) is rotatably connected to the clamping rod (41), and a driving member (45) for driving the two groups of sliding blocks (43) to slide synchronously is provided on the sound insulation board (11).

2. A Roots vacuum pump with a noise reduction structure according to claim 1, characterized in that: The driving member (45) comprises a mounting post (451) arranged on the side wall of the sound insulation board (11) away from the sound insulation box (12); a synchronization plate (452) is penetrated and slidably arranged on the mounting post (451); both sets of sliding blocks (43) are connected to the synchronization plate (452); a locking nut (453) is coaxially threadedly provided on the mounting post (451); and the locking nut (453) is movably locked to a side of the synchronization plate (452) away from the sound insulation board (11).

3. A Roots vacuum pump with a noise reduction structure according to claim 2, characterized in that: The locking assembly (3) comprises a fixing rod (31) arranged on the sound insulation box (12), the fixing rod (31) being located on a side of the sound insulation box (12) away from the sound insulation board (11), a locking column (32) being provided on the fixing rod (31), the end of the locking column (32) away from the sound insulation box (12) being hemispherical, a locking groove (33) for movably inserting the locking column (32) being provided on the bottom plate (1), a plurality of locking blocks (34) being slidably arranged on the bottom plate (1), the plurality of locking blocks (34) being arranged along the inside of the locking groove (33) The peripheral wall is evenly spaced in the circumferential direction, and one end of the locking block (34) close to the axis of the locking groove (33) is sharp. The inclined side of the locking block (34) is movably pressed against the hemispherical surface of the locking column (32). The side wall of the locking block (34) away from the bottom wall of the locking groove (33) is movably fitted with the side wall of the locking column (32) close to the fixing rod (31). An elastic member (35) is provided on the other side of the locking block (34), and the elastic member (35) always causes the locking block (34) to slide in a direction close to the axis of the locking groove (33).

4. A Roots vacuum pump with a noise reduction structure according to claim 3, characterized in that: The locking assembly (3) further comprises a reset ring (36) coaxially slidably arranged on the fixing rod (31), the reset ring (36) and the side walls of the sound insulation box (12) being movably pressed against each other, the outer peripheral wall of the reset ring (36) being sharp, the inclined side of the reset ring (36) close to the sound insulation box (12) and the inclined side of the locking block (34) close to the bottom wall of the locking groove (33) being movably pressed against each other, and the other inclined side of the reset ring (36) and the locking block The locking column (32) is provided with a receiving groove (321), the reset ring (36) is movably located in the receiving groove (321), and the inclined side of the reset ring (36) away from the locking column (32) always protrudes from the receiving groove (321), and the reset ring (36) is provided with a reset structure (37) for enabling the reset ring (36) to slide in a direction away from the receiving groove (321).

5. The Roots vacuum pump with a noise reduction structure according to claim 4, characterized in that: A clamping block (38) is slidably disposed in the locking groove (33). The clamping block (38) is coaxially arranged with the locking groove (33). The side wall of the clamping block (38) away from the bottom wall of the locking groove (33) is movably pressed against the hemispherical surface of the locking column (32). A clamping spring (39) is provided on the other side of the clamping block (38). The clamping spring (39) always causes the clamping block (38) to slide in a direction away from the bottom wall of the locking groove (33).

6. The Roots vacuum pump with a noise reduction structure according to claim 2, characterized in that: The end of the mounting column (451) close to the sound insulation board (11) is provided with a thread, and the end of the mounting column (451) away from the sound insulation board (11) is provided with a limit block (454), the limit block (454) is movably fitted with a side of the locking nut (453) away from the synchronization plate (452), and the end of the synchronization plate (452) away from the locking nut (453) is provided with a push spring (455), and the push spring (455) always makes the synchronization plate (452) slide in a direction close to the limit block (454).

7. A Roots vacuum pump with a noise reduction structure according to claim 6, characterized in that: An air inlet pipe (21) and an air outlet pipe (22) are symmetrically arranged on the vacuum pump body (2), and a muffler (5) is arranged on each of the air inlet pipe (21) and the air outlet pipe (22). A mounting hole (111) for connecting the muffler (5) with the outside of the sound insulation chamber (13) is provided on the sound insulation plate (11), and a positioning groove (112) is provided on the inner peripheral wall of the mounting hole (111). A positioning plate (6) is arranged in the positioning groove (112), and the size of the positioning groove (112) is larger than the size of the positioning plate (6). An end of the muffler (5) away from the vacuum pump body (2) is detachably connected to the positioning plate (6), and a connecting hole (61) communicating with the muffler (5) is provided on the positioning plate (6).

8. The Roots vacuum pump with a noise reduction structure according to claim 7, characterized in that: A buffer pad (24) is provided at the connection between the vacuum pump body (2) and the bottom plate (1); the buffer pad (24) is tightly pressed against a side of the vacuum pump body (2) close to the bottom plate (1); the buffer pad (24) is a rubber pad.

Images