Roots vacuum pump with dust filtering device

Abstract

The Roots vacuum pump with the dust filtering device comprises a pump shell, a Roots cavity is formed in the pump shell, the Roots cavity is provided with an air inlet and an air outlet, and the air inlet is provided with a filtering assembly; the filtering assembly comprises a butt-joint pipe, an annular seat, a mounting ring, a fixing block, a rotating shaft, a first driving part, a cleaning assembly, a conical net and a plurality of connecting rods, the butt-joint pipe is installed on the air inlet, the annular seat is fixedly arranged on the inner wall of the butt-joint pipe, the mounting ring is detachably connected to the annular seat, and the two ends of the connecting rods are fixed to the fixing block and the mounting ring. The two ends of the conical net are fixed to the fixing block and the mounting ring, the rotating shaft is rotationally connected to the fixing block, the cleaning assembly is arranged on the rotating shaft and cleans the outer surface of the conical net, and the first driving part is used for driving the rotating shaft to rotate. The first driving part drives the rotating shaft to rotate, the rotating shaft drives the cleaning assembly to rotate around the conical net, the cleaning assembly can continuously clean the conical net, and therefore the problem that after the filter net is arranged, the air exhaust efficiency of the roots vacuum pump is low is solved.

Description

Technical Field

[0001] The invention relates to the field of vacuum pumps, in particular to a Roots vacuum pump with a dust filtering device. Background Art

[0002] A Roots vacuum pump is a variable displacement vacuum pump that has two blade-shaped rotors rotating synchronously in opposite directions. There is a small gap between the rotors and between the rotors and the inner wall of the pump casing, and they do not contact each other.

[0003] When the Roots vacuum pump is extracting dusty gas, in order to prevent dust from entering the inside of the Roots vacuum pump, a filter needs to be installed at the butt joint end. However, due to the installation of the filter, the filter is constantly clogged by dust, which blocks the passage of gas and slows down the passage of gas. As a result, the suction efficiency of the butt joint end is reduced, and the amount of gas discharged from the outlet pipe end is also reduced in a single time period, resulting in low extraction efficiency of the Roots vacuum pump. Summary of the invention

[0004] In order to improve the problem of low air extraction efficiency of a Roots vacuum pump after a filter screen is provided, the present application provides a Roots vacuum pump with a dust filtering device.

[0005] The present application provides a Roots vacuum pump with a dust filtering device adopts the following technical solution: A Roots vacuum pump with a dust filtering device comprises a pump housing, a Roots cavity is provided in the pump housing, an air inlet and an air outlet are respectively provided at the upper and lower ends of the Roots cavity, a driving rotor and a driven rotor which cooperate with each other are rotatably connected in the Roots cavity, and a filter assembly for filtering gas entering the Roots cavity is provided at the air inlet; The filter assembly includes a butt joint, an annular seat, a mounting ring, a fixed block, a rotating shaft, a driving member 1, a cleaning assembly, a conical net and a plurality of connecting rods. The butt joint is installed on the air inlet, the annular seat is fixedly arranged on the inner wall of the butt joint, the mounting ring is detachably connected to the annular seat, the two ends of the connecting rod are respectively fixedly arranged on the fixing block and the mounting ring, the tapered end and the gradually expanding end of the conical net are respectively fixedly arranged on the fixing block and the mounting ring, the fixing block is located on the side of the mounting ring away from the Roots chamber, the rotating shaft is rotatably connected to the fixing block, the rotating shaft is coaxially arranged with the conical net, the cleaning assembly is arranged on the rotating shaft for cleaning the outer surface of the conical net, and the driving member 1 is used to drive the rotating shaft to rotate.

[0006] By adopting the above technical solution, a conical net is set, which can increase the contact area with the passing gas compared with a flat net, thereby improving the filtering effect and filtering efficiency. The driving member drives the rotating shaft to rotate, and the rotating shaft drives the cleaning component to rotate around the conical net. The cleaning component can continuously clean around the conical net, and the conical net is not easy to be blocked, thereby improving the problem of low air extraction efficiency of the Roots vacuum pump after the filter net is set.

[0007] Preferably, the driving member 1 comprises a plurality of blades, the plurality of blades are arranged on the outer wall of the rotating shaft along the circumferential direction, the blades are located on the inner side of the conical net, the blades have a certain inclination, and the blades rotate around the rotating shaft following the airflow of the air inlet.

[0008] By adopting the above technical solution, the flow direction of the gas entering the butt joint tube is fixed along the axial direction of the butt joint tube, so by setting the blades at appropriate angles, the blades can be driven by the directional airflow to rotate around the rotating shaft, thereby obtaining power to drive the rotating shaft and the cleaning component to rotate.

[0009] Preferably, the cleaning assembly comprises a rotating block, a frame, a first rotating roller, a second rotating roller, a transmission belt, a second driving member, a pressing member and a dust collecting member, bristles are evenly arranged on the surface of the transmission belt, the rotating block is cylindrical, the rotating block is coaxially connected to the rotating shaft, and rotates synchronously with the rotating shaft, the top of the frame is detachably connected to the rotating block, the length direction of the frame is parallel to the generatrix direction of the conical net, the side surface of the frame facing the conical net is provided with an open cavity, the first rotating roller and the second rotating roller are located in the open cavity, and are rotatably connected to the frame, the transmission belt is wound around the first rotating roller and the second rotating roller, the transmission direction of the transmission belt is parallel to the length direction of the frame, and the second driving member is used to drive the transmission belt for transmission; The pressing member is used to drive the belt body part facing and close to the conical net to move toward one side of the conical net, so that the bristles on the conical net are pressed against the conical net; the dust collecting member is located on the side of the transmission belt away from the conical net, and is used to collect dust on the bristles.

[0010] By adopting the above technical solution, while the cleaning component rotates as a whole following the rotation of the rotating shaft, the second driving member drives the transmission belt to transmit, and the bristles on the transmission belt follow the circular motion of the frame while also following the transmission belt to move along the main line direction of the conical net. The bristles clean the dust on the conical net, and then are transmitted to the side away from the conical net along the transmission belt, and then the dust on the bristles is collected by the dust collecting member, which can improve the cleaning effect, and the dust is truly separated and collected, and will not be accumulated in the bristles.

[0011] Preferably, a key block is provided on the side wall of the rotating shaft, a key slot matching the rotating shaft and the key block is provided on the side surface of the rotating block facing the fixed block, the rotating shaft and the key block are slidably connected in the key slot, a first spring is provided between the rotating block and the rotating shaft, the first spring is located in the key slot, and two ends of the first spring are respectively fixedly arranged on the bottom wall of the key slot and on the rotating shaft; The side surfaces of the rotating block and the fixed block facing each other are fixedly provided with wear-resistant rings. When the wind speed of the butted tube is less than the set value, a gap is left between the two wear-resistant rings; when the wind speed of the butted tube exceeds the set value, the two wear-resistant rings abut against each other.

[0012] By adopting the above technical scheme, the faster the wind speed passing through the butt joint tube is, the faster the blades and the rotating shaft will rotate, and the rotation speed of the bristles will also become faster. When the rotation speed of the bristles reaches a certain value, the cleaning effect will no longer be improved, and even the bristles will fall off and wear and tear may occur due to the excessive rotation speed of the bristles. Since the airflow passing through the butt joint tube will directly act on the rotating block and the cleaning component, the greater the wind force, the more the rotating block will move toward the fixed block. When the wind speed of the butt joint tube is less than the set value, a gap will be left between the two wear-resistant rings, and the rotating block and the cleaning component will rotate normally. When the wind speed of the butt joint tube exceeds the set value, the two wear-resistant rings will abut against each other, and the two wear-resistant rings will slow down the rotation of the rotating block by mutual friction. At the same time, the greater the wind force, the greater the abutment force between the two wear-resistant rings, and the greater the friction, so the rotation speed of the rotating block can be kept within a relatively constant range, reducing damage to the bristles.

[0013] Preferably, the second driving member comprises a gear ring, a gear, a first shaft, a second shaft, a belt and two bevel teeth, an annular groove is coaxially provided on the fixing block, the gear ring is fixed in the annular groove, the first shaft is rotatably connected to the frame body around an axial direction parallel to the rotating shaft, the gear is coaxially fixed on the first shaft, and the gear is meshingly connected with the gear ring; The second shaft is rotatably connected to the frame along an axial direction parallel to the first roller, the first roller is located above the second roller, two bevel teeth are coaxially fixed on the first roller and the second shaft respectively, the two bevel teeth are meshed and connected, and the belt is wound around the second shaft and the first roller.

[0014] By adopting the above technical solution, since the gear ring is stationary, the gear follows the frame to rotate circumferentially around the gear ring, so it can drive the gear to rotate, the rotation of the gear drives the first shaft to rotate, the rotation of the first shaft drives the second shaft to rotate through the engagement of two bevel teeth, the rotation of the second shaft drives the first rotating roller to rotate through the belt, and finally drives the transmission belt for transmission.

[0015] Preferably, the abutting member comprises a bracket, a second spring, a fixed seat, a moving rod, a ball seat, a ball and a plurality of abutting wheels, the bracket is located between two belt bodies of the transmission belt which are parallel to each other, and slide grooves are respectively provided on the side walls of the opening cavity along the direction parallel to the belt width of the transmission belt, and the two ends of the bracket are respectively slidably connected to the two slide grooves; The fixing seat is fixedly arranged on the top wall of the slide slot, the top end of the moving rod is slidably connected to the bottom end of the fixing seat along the inclined direction, the fixing seat and the moving rod are both located on the side of the abutment away from the conical net, the second spring is arranged in the slide slot, the two ends of the second spring are respectively abutted on the moving rod and the abutment, for driving the abutment to move toward one side of the conical net, the length direction of the abutment is parallel to the length direction of the transmission belt, a plurality of abutment wheels are sequentially connected to the abutment along the length direction of the abutment, the abutment wheel is rotatably connected to the abutment along the width direction parallel to the transmission belt, the abutment wheel is used to abut the belt body of the transmission belt close to the conical net; The bottom end of the moving rod extends below the frame, the ball seat is fixedly arranged at the bottom end of the moving rod, the ball is hinged on the ball seat, and the ball always abuts against the top surface of the mounting ring. When the frame moves downward, the moving rod moves toward the side away from the conical net.

[0016] By adopting the above technical solution, under the action of the second spring, the abutment frame drives the plurality of abutment wheels to move toward one side of the conical net, and the abutment wheels push the belt body close to the conical net to move toward the conical net, so that the bristles on the transmission belt can better act on the conical net, and also help to tighten the transmission belt, so that the transmission belt can be transmitted more stably; At the same time, when the frame moves downward, if the transmission belt and the frame move downward completely synchronously, the gap between the transmission belt and the conical net will become smaller, which will cause the abutment force of the bristles on the conical net to become larger and the friction will also be greater. Therefore, by setting a moving rod, when the frame moves downward, the moving rod will move in an inclined direction away from the conical net, so that the second spring abuts against one end of the moving rod and moves back, to maintain the elastic force of the second spring acting on the abutment frame, so that the bristles can always maintain a stable abutment force with the conical net, reducing damage to the bristles.

[0017] Preferably, the dust collecting part includes a dust box, the top opening of the dust box is bent, and the lower end of the dust box opening is provided with a cleaning head for cleaning dust on the bristles. A mounting groove is provided on the side of the frame away from the conical net, and the opening of the dust box is clamped on the mounting groove, and the cleaning head is always in contact with the transmission belt.

[0018] By adopting the above technical solution, during the transmission of the transmission belt, the bristles continuously pass through the cleaning head, and the cleaning head can take out the dust in the bristles. The taken out dust enters the dust collecting box from the opening, and the operator can dump the dust collecting box in time.

[0019] The technical effects of the present invention are mainly reflected in the following aspects: 1. The present invention can increase the contact area with the passing gas compared with the plane net by setting the conical net, improve the filtering effect and filtering efficiency, and drive the rotating shaft to rotate by the driving member, and the rotating shaft drives the cleaning component to rotate around the conical net. The cleaning component can continuously clean around the conical net, and the conical net is not easy to be blocked, thereby improving the problem of low air extraction efficiency of the Roots vacuum pump after the filter net is set; 2. In the present invention, while the cleaning component rotates as a whole following the rotation of the rotating shaft, the second driving member drives the transmission belt to transmit, and the bristles on the transmission belt follow the circular motion of the frame and also follow the transmission belt to move along the generatrix direction of the conical net. The bristles clean the dust on the conical net and then are transmitted to the side away from the conical net along the transmission belt. The dust on the bristles is then collected by the dust collecting member, thereby improving the cleaning effect. The dust is truly separated and collected and will not be accumulated in the bristles. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0021] Figure 2 It is a cross-sectional view of a Roots vacuum pump according to an embodiment of the present application.

[0022] Figure 3 It is a schematic diagram of the structure of the filter assembly of the embodiment of the present application.

[0023] Figure 4 is along Figure 1 Section view along line AA.

[0024] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0025] Figure 6 It is a schematic diagram of the structure of the driving component 2 of the embodiment of the present application.

[0026] Figure 7 yes Figure 4 Enlarged view of point C in the middle.

[0027] Figure 8 It is a cross-sectional view of the ball seat and ball.

[0028] Description of the accompanying drawings: 1. Pump housing; 11. Roots chamber; 12. Active rotor; 13. Driven rotor; 14. Gear chamber; 15. Active gear; 16. Driven gear; 17. Motor; 2. Filter assembly; 21. Butt pipe; 22. Annular seat; 23. Mounting ring; 24. Fixing block; 241. Annular groove; 25. Rotating shaft; 251. Key block; 26. Blade; 27. Conical net; 28. Connecting rod; 3. Cleaning assembly; 31. Rotating block; 311. Key groove; 312. Wedge groove; 313. First spring; 32. Frame; 32 1. Opening cavity; 322. Slide groove; 323. Wedge block; 324. Mounting groove; 33. First roller; 331. Limiting ring groove; 34. Second roller; 35. Transmission belt; 36. Wear-resistant ring; 4. Second driving member; 41. Gear ring; 42. Gear; 43. First shaft; 44. Second shaft; 45. Belt; 46. Bevel gear; 5. Clamping member; 51. Bracket; 52. Second spring; 53. Fixed seat; 54. Moving rod; 55. Ball seat; 56. Ball; 57. Abutment wheel; 6. Dust collecting member; 61. Dust collecting box; 62. Cleaning head. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-Figure 8 The present application is further described in detail to make the technical solution of the present application easier to understand and grasp.

[0030] The embodiment of the present application discloses a Roots vacuum pump with a dust filtering device.

[0031] Reference Figure 1 and Figure 2 A Roots vacuum pump with a dust filtering device comprises a pump housing 1, wherein a Roots cavity 11 is provided in the pump housing 1, an air inlet and an air outlet are respectively provided at the upper and lower ends of the Roots cavity 11, an active rotor 12 and a driven rotor 13 which cooperate with each other are rotatably connected in the Roots cavity 11, the active rotor 12 is driven by a motor 17, and a filter assembly 2 for filtering the gas entering the Roots cavity 11 is provided at the air inlet.

[0032] Reference Figure 1 and Figure 2 The pump housing 1 also has a gear cavity 14 , a driving gear 15 is sleeved on the rotating shaft 25 of the driving rotor 12 , and a driven gear 16 meshingly connected to the driving gear 15 is sleeved on the rotating shaft 25 of the driven shaft, and both the driving gear 15 and the driven gear 16 are located in the gear cavity 14 .

[0033] Reference Figure 3 and Figure 4The filter assembly 2 includes a butt joint pipe 21, an annular seat 22, a mounting ring 23, a fixed block 24, a rotating shaft 25, a driving member 1, a cleaning assembly 3, a conical net 27 and a plurality of connecting rods 28. The butt joint pipe 21 is connected to the air inlet through a flange, the annular seat 22 is coaxially fixedly arranged on the inner wall of the butt joint pipe 21, and the mounting ring 23 is fixedly connected to the annular seat 22 through bolts. The two ends of the connecting rod 28 are respectively fixedly arranged on the fixed block 24 and the mounting ring 23, and the plurality of connecting rods 28 are evenly arranged around the circumference. The tapered end and the gradually expanding end of the conical net 27 are respectively fixedly arranged on the fixed block 24 and the mounting ring 23, and the connecting rod 28 abuts against the inner side of the conical net 27. The fixed block 24 is located on the side of the mounting ring 23 away from the Roots chamber 11. The rotating shaft 25 is rotatably connected to the fixed block 24. The rotating shaft 25 is coaxially arranged with the conical net 27. The cleaning component 3 is arranged on the rotating shaft 25 for cleaning the outer surface of the conical net 27. The driving member 1 is used to drive the rotating shaft 25 to rotate.

[0034] Reference Figure 3 and Figure 4 By setting the conical net 27, the contact area with the passing gas can be increased compared with the flat net, and the filtering effect and filtering efficiency can be improved. The rotating shaft 25 is driven to rotate by the driving member, and the rotating shaft 25 drives the cleaning component 3 to rotate around the conical net 27. The cleaning component 3 can continuously clean around the conical net 27, and the conical net 27 is not easy to be blocked, thereby improving the problem of low exhaust efficiency of the Roots vacuum pump after the filter net is set.

[0035] Reference Figure 3 and Figure 4 The driving member 1 includes a plurality of blades 26, which are arranged on the outer wall of the rotating shaft 25 along the circumferential direction. The blades 26 are located on the inner side of the conical net 27. The blades 26 have a certain inclination, and the blades 26 rotate around the rotating shaft 25 following the air flow of the air inlet.

[0036] Reference Figure 3 and Figure 4 The flow direction of the gas entering the butt joint 21 is fixed along the axial direction of the butt joint 21, so by setting the blades 26 at a suitable angle, the blades 26 can be driven by the directional airflow to rotate around the rotating shaft 25, thereby obtaining power to drive the rotating shaft 25 and the cleaning component 3 to rotate.

[0037] Reference Figure 4 and Figure 5The cleaning assembly 3 includes a rotating block 31, a frame 32, a first rotating roller 33, a second rotating roller 34, a transmission belt 35, a driving member 4, a tightening member 5 and a dust collecting member 6. Bristles are evenly arranged on the surface of the transmission belt 35 (the bristles are not shown in the figure due to too many). The rotating block 31 is cylindrical, and the rotating block 31 is coaxially connected to the rotating shaft 25 and rotates synchronously with the rotating shaft 25. The top of the frame 32 is detachably connected to the rotating block 31. The top of the frame 32 has a wedge block 323. The rotating block 31 is provided with a corresponding wedge groove 312. The wedge block 323 is inserted into the wedge groove 312. The frame 32 and the rotating block 31 can also be connected in any way that does not affect the use of the rotating block 31 and the frame 32, such as directly using bolts.

[0038] Reference Figure 4 The length direction of the frame 32 is parallel to the direction of the busbar of the conical net 27. An open cavity 321 is provided on the side of the frame 32 facing the conical net 27. The first roller 33 and the second roller 34 are located in the open cavity 321 and are rotatably connected to the frame 32. The transmission belt 35 is wound around the first roller 33 and the second roller 34. The transmission direction of the transmission belt 35 is parallel to the length direction of the frame 32. The driving member 24 is used to drive the transmission belt 35 for transmission.

[0039] Reference Figure 4 The pressing member 5 is used to drive the belt 35 that is facing and close to the conical net 27 to move toward one side of the conical net 27, so that the bristles on the conical net 27 are pressed against the conical net 27; the dust collecting member 6 is located on the side of the belt 35 away from the conical net 27, and is used to collect dust on the bristles.

[0040] Reference Figure 4-Figure 6 While the cleaning component 3 rotates as a whole following the rotation of the rotating shaft 25, the driving member 24 drives the transmission belt 35 to transmit. The bristles on the transmission belt 35 follow the circular motion of the frame 32 and also follow the transmission belt 35 to move along the generatrix direction of the conical net 27. The bristles clean the dust on the conical net 27 and then transmit it to the side away from the conical net 27 along the transmission belt 35. The dust on the bristles is then collected by the dust collecting member 6, which can improve the cleaning effect. The dust is truly separated and collected and will not be accumulated in the bristles.

[0041] Reference Figure 4 and Figure 5 A key block 251 is provided on the side wall of the rotating shaft 25, and a key groove 311 matching the rotating shaft 25 and the key block 251 is opened on the side surface of the rotating block 31 facing the fixed block 24. The rotating shaft 25 and the key block 251 are slidably connected in the key groove 311, and a first spring 313 is provided between the rotating block 31 and the rotating shaft 25. The first spring 313 is located in the key groove 311, and the two ends of the first spring 313 are respectively fixedly arranged on the bottom wall of the key groove 311 and the rotating shaft 25.

[0042] Reference Figure 4 and Figure 5 A wear-resistant ring 36 is fixedly provided on the side surface of the rotating block 31 and the fixed block 24 facing each other. When the wind speed of the butt-joint pipe 21 is less than the set value, a gap is left between the two wear-resistant rings 36; when the wind speed of the butt-joint pipe 21 exceeds the set value, the two wear-resistant rings 36 abut against each other.

[0043] Reference Figure 4 and Figure 5 , the faster the wind speed through the butt joint tube 21, the faster the blades 26 and the rotating shaft 25 will rotate, and the speed of the bristles will also become faster. When the speed of the bristles reaches a certain value, the cleaning effect is no longer improved, and even the bristles may fall off and wear due to the excessive speed of the bristles. Since the airflow through the butt joint tube 21 will directly act on the rotating block 31 and the cleaning component 3, the greater the wind force, the more the rotating block 31 moves toward the fixed block 24. When the wind speed of the butt joint tube 21 is less than the set value, there is a gap between the two wear-resistant rings 36, and the rotating block 31 and the cleaning component 3 rotate normally; when the wind speed of the butt joint tube 21 exceeds the set value, the two wear-resistant rings 36 abut against each other, and the two wear-resistant rings 36 slow down the rotation of the rotating block 31 by mutual friction. At the same time, the greater the wind force, the greater the abutment force between the two wear-resistant rings 36, and the greater the friction, so the speed of the rotating block 31 can be kept within a relatively constant range, reducing damage to the bristles.

[0044] Reference Figure 4-Figure 6 The driving member 2 4 includes a gear ring 41, a gear 42, a first shaft 43, a second shaft 44, a belt 45 and two bevel teeth 46. A ring groove 241 is coaxially provided on the fixed block 24. The gear ring 41 is fixed in the ring groove 241. The first shaft 43 is rotatably connected to the frame 32 around an axial direction parallel to the rotating shaft 25. The gear 42 is coaxially fixed on the first shaft 43, and the gear 42 is meshed with the gear ring 41.

[0045] Reference Figure 4-Figure 6 The second shaft 44 is rotatably connected to the frame 32 along the axial direction parallel to the first roller 33, the first roller 33 is located above the second roller 34, and the two bevel teeth 46 are coaxially fixed on the first roller 33 and the second shaft 44 respectively. The two bevel teeth 46 are meshed and connected, and the belt 45 is wound around the second shaft 44 and the first roller 33.

[0046] Reference Figure 4-Figure 6 Since the gear ring 41 is stationary, the gear 42 rotates circumferentially around the gear ring 41 following the frame 32, so it can drive the gear 42 to rotate. The rotation of the gear 42 drives the first shaft 43 to rotate. The rotation of the first shaft 43 drives the second shaft 44 to rotate through the meshing of two bevel teeth 46. The rotation of the second shaft 44 drives the first rotating roller to rotate through the belt 45, and finally drives the transmission belt 35 for transmission.

[0047] Reference Figure 4-Figure 6 When the rotating block 31 and the cleaning assembly 3 move under the action of wind force, the gear 42 is always engaged with the gear ring 41 and will not cause any influence on the transmission of the driving member 2 4.

[0048] Reference Figure 6 The belt 45 and the transmission belt 35 do not contact each other, and two limiting ring grooves 331 are provided on the first rotating roller to limit the belt 45 and the transmission belt 35 respectively.

[0049] Reference Figure 4 , Figure 7 and Figure 8 The abutting member 5 includes a abutting frame 51, a second spring 52, a fixed seat 53, a moving rod 54, a ball seat 55, a ball 56 and a plurality of abutting wheels 57. The abutting frame 51 is located between two belt bodies of the transmission belt 35 which are parallel to each other. Slide grooves 322 are respectively provided on the side walls of the opening 321 along the direction parallel to the bandwidth of the transmission belt 35. The two ends of the abutting frame 51 are respectively slidably connected to the two slide grooves 322.

[0050] Reference Figure 4 , Figure 7 and Figure 8 The fixed seat 53 is fixedly set on the top wall of the slide groove 322, and the top of the moving rod 54 is slidably connected to the bottom of the fixed seat 53 along the inclined direction. The fixed seat 53 and the moving rod 54 are both located on the side of the bracket 51 away from the conical net 27. The second spring 52 is set in the slide groove 322, and the two ends of the second spring 52 are respectively abutted on the moving rod 54 and the bracket 51, which are used to drive the bracket 51 to move toward the side of the conical net 27. The length direction of the bracket 51 is parallel to the length direction of the transmission belt 35. A plurality of abutment wheels 57 are sequentially connected to the bracket 51 along the abutment length direction. The abutment wheels 57 are rotatably connected to the bracket 51 along the width direction parallel to the transmission belt 35, and the abutment wheels 57 are used to abut the belt body of the transmission belt 35 close to the conical net 27.

[0051] Reference Figure 4 , Figure 7 and Figure 8 The bottom end of the moving rod 54 extends to the bottom of the frame 32, the ball seat 55 is fixedly set at the bottom end of the moving rod 54, the ball 56 is hinged on the ball seat 55, and the ball 56 always abuts against the top surface of the mounting ring 23. When the frame 32 moves downward, the moving rod 54 moves toward the side away from the conical net 27.

[0052] Reference Figure 4 , Figure 7 and Figure 8Under the action of the second spring 52, the abutment frame 51 drives several abutment wheels 57 to move toward the side of the conical net 27, and the abutment wheels 57 push the belt body of the transmission belt 35 close to the side of the conical net 27 to move toward the side of the conical net 27, so that the bristles on the transmission belt 35 can better act on the conical net 27, and also help to tighten the transmission belt 35, so that the transmission belt 35 can transmit more stably.

[0053] Reference Figure 4 , Figure 7 and Figure 8 At the same time, when the frame 32 moves downward, if the transmission belt 35 and the frame 32 move downward completely synchronously, the gap between the transmission belt 35 and the conical net 27 will become smaller, which will cause the abutment force of the bristles on the conical net 27 to become larger and the friction will also be greater. Therefore, by setting a moving rod 54, when the frame 32 moves downward, the moving rod 54 will move in an inclined direction away from the side of the conical net 27, so that the second spring 52 abuts against one end of the moving rod 54 and retreats, so as to maintain the elastic force of the second spring 52 acting on the abutment frame 51, so that the bristles can always maintain a stable abutment force with the conical net 27, reducing damage to the bristles.

[0054] Reference Figure 4 and Figure 8 In order to make the ball 56 always abut against the mounting ring 23, the ball seat 55 can be equipped with a counterweight according to actual conditions.

[0055] Reference Figure 4 and Figure 7 The dust collecting part 6 includes a dust collecting box 61, the top opening of the dust collecting box 61 is bent, and the lower end of the opening of the dust collecting box 61 is provided with a cleaning head 62 for cleaning the dust on the bristles. The cleaning head 62 can be any component that can clean the dust on the bristles. A mounting groove 324 is provided on the side of the frame 32 away from the conical net 27. The opening of the dust collecting box 61 is clamped on the mounting groove 324, and the cleaning head 62 is always in contact with the transmission belt 35.

[0056] Reference Figure 4 and Figure 7 During the transmission of the transmission belt 35, the bristles continuously pass through the cleaning head 62, and the cleaning head 62 can take out the dust in the bristles. The dust taken out enters the dust box 61 from the opening, and the operator can dump the dust box 61 in time.

[0057] Reference Figure 3 and Figure 4 A cover body may be further added to the rotating block 31 , and the cover body may cover the gear ring 41 and other components, thereby further reducing the influence of dust on the meshing of the gear ring 41 and the gear 42 .

[0058] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. A Roots vacuum pump with a dust filtering device, characterized in that: The invention comprises a pump housing (1), wherein a Roots chamber (11) is provided in the pump housing (1), an air inlet and an air outlet are respectively provided at the upper and lower ends of the Roots chamber (11), a driving rotor (12) and a driven rotor (13) which cooperate with each other are rotatably connected in the Roots chamber (11), and a filter assembly (2) for filtering gas entering the Roots chamber (11) is provided at the air inlet; The filter assembly (2) comprises a butt joint tube (21), an annular seat (22), a mounting ring (23), a fixing block (24), a rotating shaft (25), a driving member 1, a cleaning assembly (3), a conical net (27) and a plurality of connecting rods (28); the butt joint tube (21) is mounted on the air inlet; the annular seat (22) is fixedly arranged on the inner wall of the butt joint tube (21); the mounting ring (23) is detachably connected to the annular seat (22); and the two ends of the connecting rod (28) are respectively fixedly arranged on the fixing block (24) and the mounting ring (2 3), the tapered end and the gradually expanding end of the conical net (27) are fixedly arranged on a fixed block (24) and a mounting ring (23) respectively, the fixed block (24) is located on a side of the mounting ring (23) away from the Roots chamber (11), the rotating shaft (25) is rotatably connected to the fixed block (24), the rotating shaft (25) and the conical net (27) are coaxially arranged, the cleaning component (3) is arranged on the rotating shaft (25) and is used for cleaning the outer surface of the conical net (27), and the driving member 1 is used for driving the rotating shaft (25) to rotate.

2. A Roots vacuum pump with a dust filtering device according to claim 1, characterized in that: The driving member 1 comprises a plurality of blades (26), the plurality of blades (26) being arranged on the outer wall of the rotating shaft (25) along the circumferential direction, the blades (26) being located on the inner side of the conical net (27), the blades (26) having a certain inclination, and the blades (26) rotating around the rotating shaft (25) following the airflow of the air inlet.

3. The Roots vacuum pump with a dust filtering device according to claim 1, characterized in that: The cleaning assembly (3) comprises a rotating block (31), a frame (32), a first rotating roller (33), a second rotating roller (34), a transmission belt (35), a second driving member (4), a pressing member (5) and a dust collecting member (6); bristles are evenly arranged on the surface of the transmission belt (35); the rotating block (31) is cylindrical; the rotating block (31) is coaxially connected to the rotating shaft (25) and rotates synchronously with the rotating shaft (25); the top end of the frame (32) is detachably connected to the rotating block (31); the length direction of the frame (32) is flat. The frame (32) is arranged in the direction of the generatrix of the conical net (27), and an open cavity (321) is provided on the side of the frame (32) facing the conical net (27). The first rotating roller (33) and the second rotating roller (34) are located in the open cavity (321) and are rotatably connected to the frame (32). The transmission belt (35) is wound around the first rotating roller (33) and the second rotating roller (34). The transmission direction of the transmission belt (35) is parallel to the length direction of the frame (32). The second driving member (4) is used to drive the transmission belt (35) to transmit. The pressing member (5) is used to drive the belt body portion of the transmission belt (35) facing and close to the conical net (27) to move toward one side of the conical net (27), so that the bristles on the conical net (27) are pressed against the conical net (27); the dust collecting member (6) is located on the side of the transmission belt (35) away from the conical net (27) and is used to collect dust on the bristles.

4. A Roots vacuum pump with a dust filtering device according to claim 3, characterized in that: A key block (251) is provided on the side wall of the rotating shaft (25); a key slot (311) matching the rotating shaft (25) and the key block (251) is provided on the side surface of the rotating block (31) facing the fixed block (24); the rotating shaft (25) and the key block (251) are slidably connected in the key slot (311); a first spring (313) is provided between the rotating block (31) and the rotating shaft (25); the first spring (313) is located in the key slot (311); and two ends of the first spring (313) are respectively fixedly arranged on the bottom wall of the key slot (311) and on the rotating shaft (25); A wear-resistant ring (36) is fixedly provided on the side surface of the rotating block (31) and the fixed block (24) facing each other. When the wind speed of the butted tube (21) is less than a set value, a gap is left between the two wear-resistant rings (36); when the wind speed of the butted tube (21) exceeds the set value, the two wear-resistant rings (36) abut against each other.

5. The Roots vacuum pump with a dust filtering device according to claim 3, characterized in that: The second driving member (4) comprises a toothed ring (41), a gear (42), a first shaft (43), a second shaft (44), a belt (45) and two bevel teeth (46); an annular groove (241) is coaxially provided on the fixing block (24); the toothed ring (41) is fixed in the annular groove (241); the first shaft (43) is rotatably connected to the frame (32) around an axial direction parallel to the rotating shaft (25); the gear (42) is coaxially fixedly arranged on the first shaft (43); and the gear (42) is meshingly connected with the toothed ring (41); The second shaft (44) is rotatably connected to the frame (32) along an axial direction parallel to the first roller (33); the first roller (33) is located above the second roller (34); two bevel teeth (46) are coaxially fixedly arranged on the first roller (33) and the second shaft (44), respectively; the two bevel teeth (46) are meshed and connected; and the belt (45) is wound around the second shaft (44) and the first roller (33).

6. The Roots vacuum pump with a dust filtering device according to claim 4, characterized in that: The abutting member (5) comprises a support frame (51), a second spring (52), a fixed seat (53), a moving rod (54), a ball seat (55), a ball (56) and a plurality of abutting wheels (57); the support frame (51) is located between two belt bodies of the transmission belt (35) which are parallel to each other; sliding grooves (322) are respectively provided on the side walls of the opening (321) along the direction parallel to the width of the transmission belt (35); and the two ends of the support frame (51) are respectively slidably connected to the two sliding grooves (322); The fixed seat (53) is fixedly arranged on the top wall of the slide groove (322), and the top end of the moving rod (54) is slidably connected to the bottom end of the fixed seat (53) along the inclined direction. The fixed seat (53) and the moving rod (54) are both located on the side of the support frame (51) away from the conical net (27). The second spring (52) is arranged in the slide groove (322), and the two ends of the second spring (52) are respectively abutted on the moving rod (54) and the support frame (51) to drive the support frame (51) to move toward one side of the conical net (27). The length direction of the support frame (51) is parallel to the length direction of the transmission belt (35). A plurality of abutment wheels (57) are sequentially connected to the support frame (51) along the abutment length direction. The abutment wheels (57) are rotatably connected to the support frame (51) along a width direction parallel to the transmission belt (35). The abutment wheels (57) are used to abut the belt body of the transmission belt (35) close to the conical net (27). The bottom end of the moving rod (54) extends to below the frame (32); the ball seat (55) is fixedly arranged at the bottom end of the moving rod (54); the ball (56) is hinged on the ball seat (55); the ball (56) always abuts against the top surface of the mounting ring (23); when the frame (32) moves downward, the moving rod (54) moves toward a side away from the conical net (27).

7. The Roots vacuum pump with a dust filtering device according to claim 3, characterized in that: The dust collecting member (6) comprises a dust collecting box (61), the top opening of the dust collecting box (61) is bent, a cleaning head (62) for cleaning dust on the bristles is provided at the lower end of the opening of the dust collecting box (61), a mounting groove (324) is provided on the side surface of the frame (32) away from the conical net (27), the opening of the dust collecting box (61) is clamped on the mounting groove (324), and the cleaning head (62) is always in contact with the transmission belt (35).

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