Low-noise variable-pitch multi-stage roots vacuum pump

Abstract

The invention discloses a low-noise variable-pitch multistage roots vacuum pump, and belongs to the field of roots vacuum pumps. Comprising a vacuum pump body, and a cleaning assembly is arranged on the outer side wall of the vacuum pump body; a filtering assembly is arranged at the output end of the vacuum pump body; two damping assemblies are arranged at the bottom of the vacuum pump body. The left end of an output shaft of the vacuum pump body is fixedly connected with a stirring disc, two arc-shaped stirring teeth are integrally formed on the outer side wall of the stirring disc, and the left side, located in front of the stirring disc, of the vacuum pump body is rotationally connected with a first gear through a rotating shaft. When the vacuum pump body is used, a second U-shaped frame is driven to reciprocate along the outer side of the rear surface of the vacuum pump body, the second U-shaped frame is driven to reciprocate along the arc-shaped surface part of the front surface of the vacuum pump body, a first concave block can reciprocate along the arc-shaped part of a cooling fin, and then the surface of the cooling fin is wiped through a first wiping block.

Description

Technical Field

[0001] The present invention relates to the field of Roots vacuum pumps, and particularly to a multi-stage Roots vacuum pump with low noise and variable pitch. Background Art

[0002] The Roots vacuum pump evolved from the Roots blower, including high-vacuum multi-stage Roots pumps, medium-vacuum Roots booster pumps, and dry Roots pumps directly exhausting to the atmosphere. It is widely used in industries such as chemical engineering, papermaking, metallurgy, film preparation, and food, and is also a commonly used vacuum pump in the IC equipment industry. Vacuum pumps are widely used in industries such as electronics, chemical engineering, and textiles. According to different usage requirements, different vacuum pumps or a combination of multiple vacuum pumps are used to obtain a vacuum. The Roots pump cannot operate alone and requires a fore pump to be added;

[0003] Patent CN118640165A: It relates to the technical field of Roots vacuum pumps, specifically referring to a Roots vacuum pump, including a Roots vacuum pump body. A pair of mounting feet are symmetrically arranged on both sides of the lower end of the Roots vacuum pump body. A number of equally spaced heat dissipation fins are horizontally arranged in the middle of the Roots vacuum pump body. A heat dissipation component is installed on the heat dissipation fins. A damping component I is installed at the lower end of the mounting feet. A connecting plate is installed at the lower end of the damping component I. A damping component II connected to the connecting plate is provided at the lower end of the damping component I. The advantages of this device are as follows: By allowing cooling water to flow through a number of heat absorption tubes located between adjacent heat dissipation fins, the middle part of the Roots vacuum pump body is quickly dissipated; Through the cooperation of damper I, spring I, damper II, and spring II, the Roots vacuum pump body is damped to prevent vibration from causing bolt loosening and ensure the service life of the Roots vacuum pump body;

[0004] In the above technology, the air drawn in cannot be filtered, which easily causes dust and other debris in the air to be inhaled into the pump body of the device, thereby affecting the internal operation of the pump body. And in the above technology, the heat dissipation fins are not convenient for cleaning. During use, the surface of the heat dissipation fins cannot be cleaned in a timely manner. During long-term use, as more dust adheres to the surface of the heat dissipation fins, it is easy to affect the heat dissipation efficiency and thus affect the operation of the device. Improvements are needed. For this reason, we propose a multi-stage Roots vacuum pump with low noise and variable pitch. Summary of the Invention

[0005] Object of the Invention: The object of the present invention is to provide a device that can filter the air drawn in; Another object of the present invention is to provide a device that can clean the surface of the heat dissipation fins in a timely manner.

[0006] Technical Solution: A multi-stage Roots vacuum pump with low noise and variable pitch, including a vacuum pump body, and a cleaning component is arranged on the outer side wall of the vacuum pump body;

[0007] A filtering component is arranged at the output end of the vacuum pump body;

[0008] Two shock-absorbing components are provided at the bottom of the vacuum pump body;

[0009] The left end of the output shaft of the vacuum pump body is fixedly connected to a toggle plate, and the outer wall of the toggle plate is integrally formed with two arc-shaped toggle teeth. The left side of the vacuum pump body is located in front of the toggle plate and is rotatably connected to a gear 1 via a rotating shaft. A plurality of heat sinks are fixedly connected to the upper side of the outer wall of the vacuum pump body;

[0010] The cleaning assembly includes two shaft columns, the left ends of the two shaft columns are fixedly connected to the right side of the vacuum pump body respectively, and the outer side walls of the two shaft columns are rotatably connected to a U-shaped frame 1 and a U-shaped frame 2 respectively through a rotating shaft, the U-shaped frame 1 and the U-shaped frame 2 are respectively located at the front and rear outside of the vacuum pump body, the inner right side of the U-shaped frame 1 and the inner right side of the U-shaped frame 2 are both rotatably connected to the left side of the vacuum pump body through a rotating shaft, and the left side of the U-shaped frame 1 and the left side of the U-shaped frame 2 are respectively fixedly connected to a gear 2 and a gear 3;

[0011] The outer sides of the two arc-shaped shifting teeth are respectively meshed and connected with the rear side of the outer side wall of the gear 1 and the front side of the outer side wall of the gear 3;

[0012] The rear side of the outer wall of the gear 2 is meshed and connected with the front side of the outer wall of the gear 1;

[0013] The inner sides of the U-shaped frame 1 and the inner sides of the U-shaped frame 2 are both located on the outer sides of the plurality of heat sinks and are both installed with a concave block 1 by disassembling bolts. The inner side wall of the concave block 1 is symmetrically fixedly connected with a wiping block 1, and the wiping block 1 fits the opposite side of the heat sink.

[0014] Furthermore, the cleaning component also includes a horizontal plate 1, which is located above the vacuum pump body, and there are two horizontal plates, and sliding bars are provided on both sides of the two horizontal plates, and the inner sides of the sliding bars are fixedly connected to sliding rods, and the outer walls of the sliding rods are slidably connected to sliders, and the opposite sides of the two sliders opposite to each other are respectively fixedly connected to the two ends of the horizontal plate 1, and the side of the sliding bar away from the horizontal plate 1 is fixedly connected to the horizontal plate 2, and the lower surface of the horizontal plate 2 and the lower surface of the horizontal plate 1 and the outer sides of the multiple heat sinks are both removably installed with concave blocks 2 by bolts, and the inner side walls of the concave blocks 2 are symmetrically fixedly connected with wiping blocks 2, and the wiping blocks 2 are in contact with the opposite sides of the heat sink.

[0015] Further, rotatable heads are fixedly connected to the opposite sides of the two horizontally arranged plates II. Traction rods are rotatably connected to the opposite sides of the left and right rotatable heads through rotating shafts. The bottom ends of the traction rods are respectively rotatably connected to the outer side walls of the U-shaped frame I and the U-shaped frame II through rotating shafts.

[0016] Further, L-shaped guide rails are fixedly connected to the upper left and upper right sides of the vacuum pump body. Guide blocks are slidably connected to the inner sides of the L-shaped guide rails. The adjacent guide blocks and the opposite sides of the horizontally arranged plates II are fixedly connected.

[0017] Further, torsion springs are sleeved on the outer side walls of the shaft columns. The right ends of the torsion springs are fixedly connected to the left sides of the shaft columns. The left ends of the two torsion springs are respectively fixedly connected to the right sides of the U-shaped frame I and the U-shaped frame II.

[0018] Further, a return spring is sleeved on the outer side wall of the sliding rod. The two ends of the return spring are respectively fixedly connected to the opposite sides of the slider and the sliding strip.

[0019] Further, the filtering assembly includes a filtering box. The bottom of the filtering box is fixedly and communicatively connected to the top end of the input of the vacuum pump body. An air inlet pipe opening is integrally formed at the top of the filtering box. A filter screen is snap-fitted inside the filtering box. A box cover is fixedly connected to the front surface of the filter screen. The box cover and the filtering box are detachably connected by bolts.

[0020] Further, support feet are symmetrically and fixedly connected to the lower surface of the vacuum pump body.

[0021] Further, the shock absorption assembly includes a contraction box. A plurality of dampers are fixedly connected to the lower surface inside the contraction box. A lifting seat is fixedly connected to the tops of the plurality of dampers. The top of the lifting seat penetrates above the contraction box and is slidably connected to the contraction box. A connecting piece is fixedly connected to the top of the lifting seat. The upper surface of the connecting piece is in contact with the lower surface of the support foot. The connecting piece and the support foot are detachably connected by bolts. A shock absorption spring is sleeved on the outer side wall of the damper. The two ends of the shock absorption spring are respectively fixedly connected to the opposite sides of the lifting seat and the contraction box.

[0022] Beneficial effects: When the vacuum pump body is in use, it drives the U-shaped frame II to reciprocally move along the outer side of the rear surface of the vacuum pump body and drives the U-shaped frame II to reciprocally move along the arc-shaped part of the front surface of the vacuum pump body, so that the concave block I can reciprocally move along the arc-shaped part of the heat sink, and then the wiping block I wipes the surface of the heat sink.

[0023] As the vacuum pump body starts, driving the first U-shaped frame and the second U-shaped frame to reciprocate along the front surface and the rear surface part, when being pushed by the traction rod, the two front and rear opposite first cross plates and the two front and rear opposite second cross plates will reciprocate relatively and move away from each other, thereby driving a plurality of second concave blocks to reciprocate horizontally along the heat sink, so that the second wiping block wipes the horizontal part of the heat sink surface on the vacuum pump body;

[0024] When the second cross plate and the first cross plate approach the input end of the middle part of the upper surface of the vacuum pump body, and when the first cross plate is pushed to contact the input end of the vacuum pump body and is blocked, the traction rod can continue to push the front and rear opposite second cross plates to move relatively. At this time, the return spring is compressed, and the second cross plate slides along the outer side walls of the sliding rod and the slider through the sliding strip and continues to move. This way, when the second concave block drives the second wiping block to wipe the surfaces of a plurality of heat sinks on the upper surface of the vacuum pump body, it can wipe the plurality of heat sinks blocked by the input end in the middle part of the upper surface of the vacuum pump body, and at the same time, it can wipe the heat sinks that are not blocked by the input end on the upper surface completely, ensuring comprehensive wiping;

[0025] By reciprocating motion, dust and attachments are removed, avoiding the decline of heat dissipation efficiency. The cleaning component is directly driven by the rotational power of the vacuum pump body without additional energy input, reducing the system complexity and energy consumption. The first wiping block is detachable and replaceable, facilitating regular cleaning or replacement of worn parts, and prolonging the service life of the equipment;

[0026] In this application, the first wiping block and the second wiping block are provided to wipe the arc surface and the horizontal surface of the heat sink respectively, and during the wiping process, it will not be affected by the problem that some heat sinks are blocked by the input end of the pump body itself, resulting in incomplete wiping. This way, during the wiping process of a plurality of heat sinks arranged on the surface of the vacuum pump body of this shape, it ensures comprehensive wiping and ensures that the heat dissipation effect is not affected. Brief Description of the Drawings

[0027] Figure 1 is the front view structural schematic diagram of the present invention;

[0028] Figure 2 is the side view structural schematic diagram of the present invention;

[0029] Figure 3 is the connection structural schematic diagram of the first U-shaped frame, the traction rod, the first cross bar, the second cross bar, the sliding strip and the shaft column of the present invention;

[0030] Figure 4 is the side view connection structural schematic diagram of the sliding strip, the sliding rod and the slider of the present invention;

[0031] Figure 5 is the internal structural schematic diagram of the filtering component of the present invention;

[0032] Figure 6 It is a schematic diagram of the internal structure of the filtration component of the present invention.

[0033] In the figure: 1. Vacuum pump body; 2. Cleaning component; 3. Filtration component; 4. Shock absorption component; 5. Dial; 6. Arc-shaped dial teeth; 7. Gear 1; 8. Heat sink; 9. Support feet; 201. Shaft column; 202. U-shaped frame 1; 203. U-shaped frame 2; 204. Gear 2; 205. Gear 3; 206. Concave block 1; 207. Wiping block 1; 208. Cross plate 1; 209. Slide bar; 210. Slide rod; 211. Slide block; 212. Cross plate 2; 213. Concave block 2; 214. Wiping block 2; 215. Rotating head; 216. Traction rod; 217. L-shaped guide rail; 218. Guide block; 219. Torsion spring; 220. Return spring; 301. Filtration box; 302. Air inlet port; 303. Filter screen; 304. Box cover; 401. Shrinkage box; 402. Damper; 403. Lifting seat; 404. Connecting piece; 405. Shock absorption spring. Detailed implementation manners

[0034] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Embodiment

[0036] As Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown, a multi-stage Roots vacuum pump with low noise and variable pitch is provided, which includes a vacuum pump body 1. The left end of the output shaft of the vacuum pump body 1 is fixedly connected with a dial 5. Two arc-shaped dial teeth 6 are integrally formed on the outer side wall of the dial 5. A gear 1 7 is rotatably connected to the front of the dial 5 on the left side of the vacuum pump body 1 through a rotating shaft. A plurality of heat sinks 8 are fixedly connected to the upper part of the outer side wall of the vacuum pump body 1;

[0037] The front surface and the rear surface of the vacuum pump body 1 are both arc surfaces, and the upper surface is a horizontal plane. When starting, the internal shaft will drive the dial 5 to rotate together, thereby driving the two arc-shaped dial teeth 6 to move together with the dial 5. The heat sinks 8 are distributed on the upper surface, the front surface and the rear surface of the vacuum pump body 1 for heat dissipation;

[0038] A cleaning component 2 is arranged on the outer side wall of the vacuum pump body 1;

[0039] The cleaning assembly 2 includes a shaft column 201, the number of which is two. The left ends of the two shaft columns 201 are respectively fixedly connected to the right side of the vacuum pump body 1, and the outer side walls of the two shaft columns 201 are respectively rotatably connected to a U-shaped frame 1 202 and a U-shaped frame 2 203 through a rotating shaft. The U-shaped frame 1 202 and the U-shaped frame 2 203 are respectively located at the outer front and outer rear of the vacuum pump body 1. The inner right side of the U-shaped frame 1 202 and the inner right side of the U-shaped frame 2 203 are both rotatably connected to the left side of the vacuum pump body 1 through a rotating shaft. The left side of the U-shaped frame 1 202 and the left side of the U-shaped frame 2 203 are respectively fixedly connected to a gear 2 204 and a gear 3 205;

[0040] The outer side walls of the two arc-shaped shifting teeth 6 are respectively meshed with the rear side of the outer side wall of gear 1 7 and the front side of the outer side wall of gear 3 205;

[0041] The rear side of the outer wall of gear 2 204 is meshed with the front side of the outer wall of gear 1 7;

[0042] The inner sides of the U-shaped frame 1 202 and the inner sides of the U-shaped frame 2 203 are both located on the outer sides of the plurality of heat sinks 8 and are both installed with concave blocks 1 206 by means of bolts. The inner side walls of the concave blocks 1 206 are symmetrically fixedly connected with wiping blocks 1 207, which fit the opposite sides of the heat sinks 8.

[0043] When the vacuum pump body 1 is in use, the toggle plate 5 is driven to rotate together, so that one of the two arc-shaped toggle teeth 6 will directly drive the U-shaped frame 203 to reciprocate along the outer side of the rear surface of the vacuum pump body 1 through intermittent meshing with the gear 3 205, while the other arc-shaped toggle tooth 6 will intermittently mesh with the gear 1 7, driving the gear 1 7 to rotate intermittently, and then through the gear 1 7 and the gear 2 204, drive the U-shaped frame 203 to reciprocate along the arc-shaped surface portion of the front surface of the vacuum pump body 1, so that the concave block 1 206 can reciprocate along the arc-shaped portion of the heat sink 8, and then the wiping block 1 207 can wipe the surface of the heat sink 8;

[0044] The reciprocating motion removes dust and attachments, thus preventing a decrease in heat dissipation efficiency. The rotational power of the vacuum pump body 1 is used to directly drive the cleaning component 2, eliminating the need for additional energy input, thereby reducing system complexity and energy consumption. The wiping block 207 is removable and replaceable, facilitating regular cleaning or replacement of worn parts, thereby extending the service life of the equipment.

[0045] The cleaning assembly 2 further includes a first cross plate 208 which is located above the vacuum pump body 1. The number of the first cross plates 208 is two. Slide bars 209 are arranged on both sides of the two first cross plates 208. A slide rod 210 is fixedly connected to the inner side of the slide bar 209. A slider 211 is slidably connected to the outer wall of the slide rod 210. The opposite sides of the two left and right sliders 211 are respectively fixedly connected to the two ends of the first cross plate 208. A second cross plate 212 is fixedly connected to the side of the slide bar 209 away from the first cross plate 208. Concave blocks two 213 are detachably installed by bolts on the lower surfaces of the second cross plate 212 and the first cross plate 208 and on the outer sides of the plurality of heat sinks 8. Wiping blocks two 214 are symmetrically fixedly connected to the inner side walls of the concave blocks two 213. The opposite sides of the wiping blocks two 214 and the heat sinks 8 are in contact with each other;

[0046] Rotating heads 215 are fixedly connected to the opposite sides of the two front and rear second cross plates 212. Traction rods 216 are rotatably connected to the opposite sides of the two left and right rotating heads 215 through rotating shafts. The bottom ends of the plurality of traction rods 216 are respectively rotatably connected to the outer walls of the U-shaped frame one 202 and the U-shaped frame two 203 through rotating shafts;

[0047] L-shaped guide rails 217 are fixedly connected to the upper left side and the upper right side of the vacuum pump body 1. Guide blocks 218 are slidably connected to the inner sides of the L-shaped guide rails 217. The adjacent guide blocks 218 and the opposite sides of the second cross plate 212 are fixedly connected;

[0048] A torsion spring 219 is sleeved on the outer wall of the shaft column 201. The right end of the torsion spring 219 is fixedly connected to the left side of the shaft column 201. The left ends of the two torsion springs 219 are respectively fixedly connected to the right side of the U-shaped frame one 202 and the right side of the U-shaped frame two 203;

[0049] A return spring 220 is sleeved on the outer wall of the slide rod 210. The two ends of the return spring 220 are respectively fixedly connected to the opposite sides of the slider 211 and the slide bar 209;

[0050] As the vacuum pump body 1 starts, driving the first U-shaped frame 202 and the second U-shaped frame 203 to reciprocate along the front and rear surface parts. During this process, since the second cross plate 212 is limited by the guide block 218 and the L-shaped guide rail 217, when being pushed by the traction rod 216, the two relatively front and rear first cross plates 208 and the two relatively front and rear second cross plates 212 will reciprocate relatively and move away from each other, thereby driving a plurality of second concave blocks 213 to reciprocate along the horizontal part of the heat sink 8, so that the second wiping block 214 wipes the surface of the heat sink 8. And as the first U-shaped frame 202 and the second U-shaped frame 203 move, and when they are in the state of pushing the second cross plate 212 and the first cross plate 208 towards the input end in the middle part of the upper surface of the vacuum pump body 1, since the first cross plate 208 and the second cross plate 212 are slidably connected through the slide bar 209, the slide rod 210 and the slider 211, and are abutted by the return spring 220, at this time the slide bar 209 will not slide along the outer sides of the slider 211 and the slide rod 210, so that the first cross plate 208 and the second cross plate 212 slide together. As the first U-shaped frame 202 and the second U-shaped frame 203 continue to rotate, the second cross plate 212 and the first cross plate 208 approach the input end in the middle part of the upper surface of the vacuum pump body 1, and when the first cross plate 208 contacts the input end of the vacuum pump body 1 and is blocked, when the traction rod 216 continues to push the relatively front and rear second cross plates 212 to move relatively as the first U-shaped frame 202 and the second U-shaped frame 203 move, at this time the return spring 220 is compressed, and the second cross plate 212 slides along the outer side walls of the slide rod 210 and the slider 211 through the slide bar 209 and continues to move. This method enables the second concave block 213 to drive the second wiping block 214 to wipe the surfaces of a plurality of heat sinks 8 on the upper surface of the vacuum pump body 1. During the wiping process, it can wipe the plurality of heat sinks 8 on the middle part of the upper surface of the vacuum pump body 1 that are blocked by the input end, and at the same time can wipe the heat sinks 8 on the upper surface that are not blocked by the input end completely, ensuring comprehensive wiping;

[0051] In this application, the first wiping block 207 and the second wiping block 214 are provided to wipe the arc surface and the horizontal surface of the heat sink ⑧ respectively, and during the wiping process, it will not be affected by the problem that some heat sinks 8 are blocked by the input end of the pump body itself, resulting in incomplete wiping. This method ensures comprehensive wiping during the wiping process of a plurality of heat sinks 8 provided on the surface of the vacuum pump body 1 of this shape, and ensures that the heat dissipation effect is not affected.

[0052] As Figure 5 shown, a filtering component 3 is arranged at the output end of the vacuum pump body 1;

[0053] The filtering component 3 includes a filtering box 301. The bottom of the filtering box 301 is fixedly communicated with the top end of the input of the vacuum pump body 1. The top of the filtering box 301 is integrally formed with an air inlet port 302. A filter screen 303 is snap-fitted inside the filtering box 301. A box cover 304 is fixedly connected to the front surface of the filter screen 303. The box cover 304 is detachably connected to the filtering box 301 by bolts.

[0054] The filter screen 303 can intercept impurities such as dust and particulate matter in the gas, preventing them from entering the inside of the vacuum pump and causing wear to the rotor or pump cavity, thereby extending the service life of the equipment.

[0055] The box cover 304 is connected to the filtering box 301 by bolts, and the filter screen 303 can be quickly disassembled for cleaning or replacement.

[0056] When the vacuum pump body 1 is started, air enters through the air inlet port 302, and after being filtered by the filter screen 303, it is discharged from the output end of the vacuum pump body 1.

[0057] As Figure 6 shown, two shock-absorbing components 4 are provided at the bottom of the vacuum pump body 1.

[0058] Support feet 9 are symmetrically and fixedly connected to the lower surface of the vacuum pump body 1.

[0059] The shock-absorbing component 4 includes a contraction box 401. A plurality of dampers 402 are fixedly connected to the lower surface inside the contraction box 401. A lifting seat 403 is fixedly connected to the tops of the plurality of dampers 402. The top of the lifting seat 403 penetrates above the contraction box 401 and is slidably connected to the contraction box 401. A connecting piece 404 is fixedly connected to the top of the lifting seat 403. The upper surface of the connecting piece 404 is fitted with the lower surface of the support foot 9, and the connecting piece 404 is detachably connected to the support foot 9 by bolts. A shock-absorbing spring 405 is sleeved on the outer side wall of the damper 402. The two ends of the shock-absorbing spring 405 are respectively fixedly connected to the opposite sides of the lifting seat 403 and the contraction box 401.

[0060] The damper 402 absorbs vibration energy through its own damping characteristics, and the shock-absorbing spring 405 buffers the impact force through elastic deformation. The two combine to form a multi-stage shock-absorbing system, significantly reducing the vibration transmission during the operation of the vacuum pump.

[0061] The support feet 9 are symmetrically distributed. Cooperating with the uniform force of the plurality of dampers 402, the vibration energy of the pump body is effectively dispersed, avoiding mechanical wear caused by local stress concentration.

[0062] The connecting piece 404 is connected to the support foot 9 by bolts, facilitating disassembly, maintenance or replacement of the shock-absorbing component 4.

[0063] The sliding connection structure between the lifting seat 403 and the contraction box 401 allows for a small displacement of the pump body during the shock absorption process, avoiding rigid impacts and maintaining the overall support stability at the same time;

[0064] The contraction box 401 wraps the damper 402 and the shock absorption spring 405, preventing external dust or liquid from invading and extending the service life of the shock absorption component 4.

[0065] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention shall be subject to the appended claims.

Claims

1. A multi-stage Roots vacuum pump with variable pitch and low noise, comprising a vacuum pump body (1), characterized in that: The outer side wall of the vacuum pump body (1) is provided with a cleaning component (2); The output end of the vacuum pump body (1) is provided with a filter assembly (3); Two shock absorbing components (4) are provided at the bottom of the vacuum pump body (1); The left end of the output shaft of the vacuum pump body (1) is fixedly connected to a toggle plate (5), and the outer wall of the toggle plate (5) is integrally formed with two arc-shaped toggle teeth (6). The left side of the vacuum pump body (1) is located in front of the toggle plate (5) and is rotatably connected to a gear 1 (7) via a rotating shaft. A plurality of heat sinks (8) are fixedly connected to the upper side of the outer wall of the vacuum pump body (1); The cleaning assembly (2) includes a shaft column (201), the number of the shaft columns (201) is two, the left ends of the two shaft columns (201) are fixedly connected to the right side of the vacuum pump body (1), the outer side walls of the two shaft columns (201) are respectively connected to a U-shaped frame 1 (202) and a U-shaped frame 2 (203) through a rotating shaft, the U-shaped frame 1 (202) and the U-shaped frame 2 (203) are respectively located at the outer front and outer rear of the vacuum pump body (1), the inner right side of the U-shaped frame 1 (202) and the inner right side of the U-shaped frame 2 (203) are both connected to the left side of the vacuum pump body (1) through a rotating shaft, and the left side of the U-shaped frame 1 (202) and the left side of the U-shaped frame 2 (203) are respectively fixedly connected to a gear 2 (204) and a gear 3 (205); The outer side walls of the two arc-shaped shifting teeth (6) are respectively meshed and connected with the rear side of the outer side wall of the gear one (7) and the front side of the outer side wall of the gear three (205); The rear side of the outer wall of the gear 2 (204) is meshedly connected with the front side of the outer wall of the gear 1 (7); The inner sides of the U-shaped frame 1 (202) and the inner sides of the U-shaped frame 2 (203) are both located on the outer sides of the plurality of heat sinks (8) and are both installed with concave blocks 1 (206) by means of bolts. The inner side walls of the concave blocks 1 (206) are symmetrically fixedly connected with wiping blocks 1 (207). The wiping blocks 1 (207) are in contact with the opposite sides of the heat sinks (8).

2. The multi-stage Roots vacuum pump with variable pitch and low noise according to claim 1, characterized in that: The cleaning assembly (2) further includes a first horizontal plate (208) which is located above the vacuum pump body (1). There are two first horizontal plates (208). Sliding bars (209) are arranged on both sides of the two first horizontal plates (208). A sliding rod (210) is fixedly connected to the inner side of the sliding bar (209). A slider (211) is slidably connected to the outer side wall of the sliding rod (210). The opposite sides of the two sliders (211) on the left and right are respectively fixedly connected to the two ends of the first horizontal plate (208). A second horizontal plate (212) is fixedly connected to the side of the sliding bar (209) away from the first horizontal plate (208). Concave blocks two (213) are detachably installed by bolts on the lower surface of the second horizontal plate (212) and the lower surface of the first horizontal plate (208) and outside a plurality of the heat sinks (8). Wiping blocks two (214) are symmetrically fixedly connected to the inner side wall of the concave block two (213). The opposite sides of the wiping block two (214) and the heat sink (8) are in contact with each other.

3. The multi-stage Roots vacuum pump with variable pitch and low noise according to claim 3, characterized in that: Rotating heads (215) are fixedly connected to the opposite sides of the two second horizontal plates (212) facing front and back. Traction rods (216) are rotatably connected to the opposite sides of the two rotating heads (215) on the left and right through rotating shafts. The bottom ends of the plurality of traction rods (216) are respectively rotatably connected to the outer side wall of the first U-shaped frame (202) and the outer side wall of the second U-shaped frame (203) through rotating shafts.

4. A multi-stage Roots vacuum pump with variable pitch and low noise according to claim 2, characterized in that: L-shaped guide rails (217) are fixedly connected to the upper left side and the upper right side of the vacuum pump body (1). Guide blocks (218) are slidably connected to the inside of the L-shaped guide rails (217). The opposite sides of the adjacent guide blocks (218) and the second horizontal plate (212) are fixedly connected.

5. A multi-stage Roots vacuum pump with variable pitch and low noise according to claim 1, characterized in that: A torsion spring (219) is sleeved on the outer side wall of the shaft column (201). The right end of the torsion spring (219) is fixedly connected to the left side of the shaft column (201). The left ends of the two torsion springs (219) are respectively fixedly connected to the right side of the first U-shaped frame (202) and the right side of the second U-shaped frame (203).

6. A multi-stage Roots vacuum pump with variable pitch and low noise according to claim 2, characterized in that: A return spring (220) is sleeved on the outer side wall of the sliding rod (210). The two ends of the return spring (220) are respectively fixedly connected to the opposite sides of the slider (211) and the sliding bar (209).

7. A multi-stage Roots vacuum pump with variable pitch and low noise according to claim 1, characterized in that: The filtering assembly (3) includes a filtering box (301). The bottom of the filtering box (301) is fixedly and communicatively connected to the top end of the input end of the vacuum pump body (1). An air inlet port (302) is integrally formed on the top of the filtering box (301). A filter screen (303) is snap-fitted and installed inside the filtering box (301). A box cover (304) is fixedly connected to the front surface of the filter screen (303). The box cover (304) is detachably connected to the filtering box (301) by bolts.

8. A multi-stage Roots vacuum pump with variable pitch and low noise according to claim 1, characterized in that: Support feet (9) are symmetrically fixedly connected to the lower surface of the vacuum pump body (1).

9. The multi-stage Roots vacuum pump with variable pitch and low noise according to claim 8, characterized in that: The shock absorption assembly (4) includes a contraction box (401). A plurality of dampers (402) are fixedly connected to the lower surface inside the contraction box (401). A lifting seat (403) is fixedly connected to the tops of the plurality of dampers (402). The top of the lifting seat (403) penetrates above the contraction box (401) and is slidably connected to the contraction box (401). A connecting piece (404) is fixedly connected to the top of the lifting seat (403). The upper surface of the connecting piece (404) is attached to the lower surface of the support leg (9), and the connecting piece (404) and the support leg (9) are detachably connected by bolts. A shock absorption spring (405) is sleeved on the outer side wall of the damper (402). The two ends of the shock absorption spring (405) are respectively fixedly connected to the opposite sides of the lifting seat (403) and the contraction box (401).

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