Roots vacuum pump

Abstract

The invention relates to the technical field of vacuum pump design, and discloses a roots vacuum pump. Comprising a pump body, a driving rotor rotationally connected into the pump body, a driven rotor rotationally connected into the pump body and connected with the driving rotor through gear transmission, a driving motor located on the outer side of the pump body and used for driving the driving rotor to rotate, an air inlet pipe arranged on the upper side of the pump body and an air outlet pipe arranged on the lower side of the pump body. The base plate is used for supporting the pump body and the driving motor, the fixed box is arranged above the air inlet pipe, a first pipe body which is in butt joint with the air inlet pipe is arranged at the lower end of the fixed box, a second pipe body is arranged at the upper end of the fixed box, a filter screen is arranged in the first pipe body, and a suction sleeve with a closed upper end and an open lower end is arranged in the lower end of the fixed box; a suction transverse pipe is arranged on one side of the suction sleeve, a guide sleeve allowing the suction transverse pipe to penetrate out is arranged on the side edge of the fixing box, and a suction device used for providing suction force for the interior of the suction transverse pipe after the suction sleeve is in butt joint with the first pipe body is arranged on the base plate.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum pump design, and in particular relates to a Roots vacuum pump. Background Art

[0002] A Roots vacuum pump (abbreviated as: Roots pump) is a variable displacement vacuum pump that is equipped with two leaf-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] At present, a Chinese patent with publication number CN221824053U and publication date of October 11, 2024 discloses a Roots vacuum pump, including a motor connecting seat, an active rotor shaft, a pump body and a driven rotor shaft. One end of the pump body is threadedly connected to the motor connecting seat through an end cover A, and a shaft sleeve A is provided inside the end cover A through a sealing sleeve. The interior of the shaft sleeve A is connected to the motor output shaft of the motor connecting seat through a gasket. The active rotor shaft and the driven rotor shaft are both arranged in the pump cavity of the pump body and do not contact each other. The central axes at both ends of the driven rotor shaft are installed inside the pump body through springs. The shaft of the active rotor shaft is equipped with a shaft sleeve C, and one end of the shaft sleeve C is provided with a shaft sleeve B adjusting gasket. One end of the shaft sleeve A is provided with a shaft sleeve B, and one end of the shaft sleeve B is connected to the shaft sleeve of the shaft sleeve C through a pressure cover disk. The pump body is connected with the gear train through the guide rail and the adjusting gasket. The other end of the pump body is provided with an end cover B. The top of the end cover B is threadedly connected to the pump body through the side cover. The interior of the end cover B is installed with a bearing seat A and a bearing seat B through a sealing ring sleeve. Deep groove ball bearings are installed inside the bearing seat A and the interior of the bearing seat B. The deep groove ball bearing inside the bearing seat A is connected to the driven gear through the bearing pressure cap A. The deep groove ball bearing inside the bearing seat B is connected to the driving gear through the bearing pressure cap B. The driving gear is meshed with the driven gear. The driving gear and the driven gear are connected to the bearing seat B and the bearing seat A through the shaft sleeve D and the gear adjusting gasket; one end of the driving rotor shaft and one end of the driven rotor shaft are connected to the bearing seat B and the bearing seat A through a piston ring and a bushing; an oil slinging pan is provided at the end of the shaft sleeve C, and the oil slinging pan is located in the cavity of the end cover A.

[0004] The Roots vacuum pump uses a motor to drive the active rotor shaft to rotate, and the active rotor shaft drives the driven rotor shaft to rotate through the driving gear and the driven gear, thereby forming two rotors rotating synchronously in opposite directions; then the suction force can be generated.

[0005] When the Roots vacuum pump absorbs gas, it is inevitable that there will be some particulate impurities in the gas. At this time, these particulate impurities will easily rub against the outer walls of the two rotors and the inner walls of the pump body after entering the pump body, which may eventually cause wear of the outer walls of the two rotors and the inner walls of the pump body. Summary of the Invention

[0006] The present invention aims to provide a Roots vacuum pump which can filter the gas entering the pump body and prevent particulate impurities from entering the pump body.

[0007] The above-mentioned technical purpose of the present invention is achieved through the following technical solutions: a Roots vacuum pump, comprising a pump body, an active rotor rotatably connected to the pump body, a driven rotor rotatably connected to the pump body and connected to the active rotor through gear transmission, a drive motor located outside the pump body and used to drive the active rotor to rotate, an air inlet pipe arranged on the upper side of the pump body, an air outlet pipe arranged on the lower side of the pump body, and also comprising a base plate for supporting the pump body and the drive motor, a fixed box arranged above the air inlet pipe, a first tube body docked with the air inlet pipe is provided at the lower end of the fixed box, a second tube body is provided at the upper end of the fixed box, a filter screen is provided in the first tube body, a suction sleeve with a closed upper end and an open lower end is provided in the lower end of the fixed box, a suction cross pipe is provided on one side of the suction sleeve, a guide sleeve for the suction cross pipe to pass through is provided at the side of the fixed box, and a suction device is provided on the seat plate for providing suction to the suction cross pipe after the suction sleeve is docked with the first tube body.

[0008] By adopting the above technical solution, when the pump body utilizes the rotation of the active rotor and the driven rotor to suck gas through the intake pipe, the gas will first enter the fixed box through the second tube body, and then the gas will pass through the filter screen in the first tube body and enter the intake pipe. At this time, the filter screen in the first tube body can be used to filter the particulate impurities in the gas; after the pump body has been used for a period of time, the driving motor is stopped to drive the active rotor and the driven rotor to rotate, and then the suction cross tube is pushed toward the fixed box, so that the suction sleeve is docked with the first tube body, and then the suction device can be used to provide suction to the suction cross tube. At this time, the suction sleeve can absorb the particulate impurities filtered out of the filter screen, thereby avoiding the presence of particulate impurities affecting the flow rate of the gas in the first tube body; finally, the gas entering the pump body can be filtered to avoid particulate impurities entering the pump body.

[0009] The present invention is further configured such that: the filter screen is in a cone shape with its opening downward.

[0010] By adopting the above technical solution, the filter screen is in the shape of a cone with an opening downward, and the particulate impurities filtered by the filter screen can slide toward the side of the filter screen under the action of suction, so that the particulate impurities accumulated on the filter screen are uniformly gathered on the side of the filter screen, and ultimately the influence of the particulate impurities on the filter screen on the gas flow rate in the first tube body can be reduced.

[0011] The present invention is further configured as follows: the suction device includes a suction vertical pipe arranged at one end of the suction horizontal pipe away from the suction sleeve, a centrifugal fan arranged at the lower end of the suction vertical pipe, and a sliding assembly arranged on the seat plate and used to drive the suction horizontal pipe to extend and retract in the guide sleeve.

[0012] By adopting the above technical solution, when it is necessary to use the suction horizontal pipe and the suction sleeve to attract the particulate impurities on the filter net, the sliding assembly is first used to drive the suction horizontal pipe to move toward the fixed box, so that the suction sleeve and the first tube body are docked, and then the centrifugal fan is used to provide suction to the suction vertical pipe. At this time, the suction sleeve can attract the particulate impurities on the filter net through the suction provided by the centrifugal fan.

[0013] The present invention is further configured as follows: the centrifugal fan includes a casing with an impeller rotatably connected thereto, an air inlet pipe arranged at the air inlet of the casing and docked with the lower end of the suction vertical pipe, a gear box arranged at the lower side of the casing, a wheel shaft rotatably connected to the lower side of the casing and connected to the impeller at the upper end, a first bevel gear arranged at the lower end of the wheel shaft, a transmission shaft rotatably connected to the side of the gear box, a second bevel gear arranged at the end of the transmission shaft and meshing with the first bevel gear, the drive motor is located at one end of the base plate away from the pump body, a motor seat is arranged on the lower side of the drive motor, a driving gear is arranged on the output shaft of the drive motor, and a first bearing seat is arranged on the base plate. The first bearing seat is rotatably connected to a connecting shaft, one end of the connecting shaft is provided with a first driven gear meshing with the driving gear, the end of the connecting shaft away from the first driven gear is provided with a driving pulley, the end of the driving rotor is provided with a driven pulley, a belt is provided between the driving pulley and the driven pulley, the end of the transmission shaft away from the second bevel gear is provided with a second driven gear meshing with the driving gear, a second bearing seat for rotatably connecting the transmission shaft is provided on the motor seat, the upper end of the suction vertical pipe is communicated with the outside world, and a baffle covering the upper end of the suction vertical pipe when the suction sleeve is docked with the first tube body is provided on the side wall of the fixed box.

[0014] By adopting the above technical solution, the driving motor uses the driving gear to mesh with the first driven gear. At this time, the driving gear can drive the driving pulley to rotate through the first driven gear and the connecting shaft, and the driving pulley can drive the driving rotor to rotate through the belt and the driven pulley. The driving rotor can drive the driven rotor to rotate through the gear transmission, so that the pump body is in the working state and attracts gas. When there is no need to provide suction to the suction horizontal pipe, the upper end of the suction vertical pipe is connected to the outside world, and the driving motor uses the driving gear to mesh with the second driven gear. At this time, the driving gear can drive the wheel shaft to rotate through the second driven gear, the transmission shaft, the second bevel gear and the first bevel gear. Then the wheel shaft can drive the impeller in the casing to rotate. At this time, the driving motor can not only drive the driving rotor to rotate but also drive the impeller to rotate. The rotation of the impeller can generate suction to the suction vertical pipe. At this time, the suction vertical pipe relies on the upper end to suck in external gas; At the same time, when suction needs to be provided to the suction horizontal pipe, the suction horizontal pipe moves toward the fixed box and makes the suction sleeve and the first tube body dock, and the baffle on the side wall of the fixed box covers the upper end of the suction vertical pipe. At this time, the baffle can seal the upper end surface of the suction vertical pipe; then the suction force generated by the impeller can act on the suction horizontal pipe and the suction sleeve. At this time, the suction sleeve can absorb the particulate impurities filtered out by the filter net, thereby avoiding the presence of particulate impurities affecting the flow rate of gas in the first tube body.

[0015] The present invention is further configured as follows: a heat dissipation nozzle is provided at the air outlet of the casing facing the middle outer wall of the pump body, and a plurality of heat dissipation fins are provided on the outer walls on both sides of the pump body.

[0016] By adopting the above technical solution, a heat dissipation nozzle is provided at the air outlet of the casing facing the outer wall of the middle part of the pump body. Therefore, when there is no need to provide suction to the suction horizontal pipe, after the driving motor drives the impeller to rotate, the impeller attracts external gas through the upper end of the suction vertical pipe and then sprays the gas onto the outer wall of the pump body through the heat dissipation nozzle. The gas then passes through the heat dissipation fins on the outer wall of the pump body and takes away the heat on the heat dissipation fins, which is ultimately beneficial to the heat dissipation of the pump body.

[0017] The present invention is further configured as follows: the sliding assembly includes a dovetail slider arranged on the lower surface of the motor base, a dovetail groove opened on the base plate and for the dovetail slider to be embedded in, a driving cylinder arranged on the base plate, and a connecting ear arranged on the side of the motor base and for the piston rod end of the driving cylinder to be connected.

[0018] By adopting the above technical solution, after the connecting ear of the motor base is driven to move by the driving cylinder, the dovetail slider of the motor base can be driven to move back and forth along the dovetail groove. Then the motor base can drive the centrifugal fan, the suction vertical pipe and the suction horizontal pipe to move back and forth through the second bearing seat.

[0019] The present invention is further configured as follows: a through hole is provided on the connecting ear for the piston rod of the driving cylinder to pass through, a first retaining ring is provided on the end of the piston rod of the driving cylinder, a second retaining ring is provided on the piston rod of the driving cylinder and at a position on the side of the connecting ear away from the first retaining ring, a connecting spring is sleeved on the piston rod of the driving cylinder with one end connected to the second retaining ring and the other end connected to the connecting ear, a connecting arm extending toward one side of the belt is provided on the piston rod of the driving cylinder, a tensioning rubber platform is provided at the end of the connecting arm away from the driving cylinder, and the belt extends obliquely downward from the driven pulley toward the driving pulley; when the driving gear and the first driven gear are engaged, the dovetail slider moves to the extreme position at the end of the dovetail slot.

[0020] By adopting the above technical solution, when the driving cylinder drives the motor base to move toward the side away from the pump body, the driving gear and the first driven gear can be meshed, and then the driving gear can drive the driving rotor and the driven rotor in the pump body to work through the belt; at the same time, the driving cylinder will also use the connecting arm to drive the tensioning rubber platform to press against the belt, thereby tensioning the belt through the tensioning rubber platform; when the tensioning force of the tensioning rubber platform on the belt is insufficient, the piston rod of the driving cylinder continues to move toward the through hole, and the connecting spring continues to be compressed. At this time, the piston rod of the driving cylinder can continue to drive the tensioning rubber platform to move toward one side of the belt through the connecting arm, thereby increasing the tensioning force of the tensioning rubber platform on the belt, and ultimately it is beneficial to complete the stable tensioning of the belt by the extension and retraction of the piston rod of the driving cylinder.

[0021] The present invention is further configured as follows: a collecting seat is provided at a position between the pump body and the casing, a collecting cavity for embedding the heat dissipation nozzle is provided in the collecting seat, an embedding opening for passing the heat dissipation nozzle is provided at one end of the collecting seat, a fixed arm connected to the seat plate is provided on the lower side of the collecting seat, a conduit communicating with the collecting cavity is also provided on the lower side of the collecting seat, and a filter bag is provided at the lower end of the conduit.

[0022] By adopting the above technical solution, when the driving cylinder drives the motor seat to move toward the side of the pump body, the casing of the centrifugal fan can move toward the side close to the collecting seat, and then the heat dissipation nozzle can pass through the embedded port and enter the collecting cavity. When the suction sleeve ejects the particulate impurities from the heat dissipation nozzle, the particulate impurities can pass through the collecting cavity and enter the filter bag, and finally the particulate impurities can be efficiently collected by the filter bag.

[0023] The present invention is further configured as follows: a conical guide plug is provided in the embedding port and is pushed by the heat dissipation nozzle; a plurality of guide channels are provided on the peripheral side of the guide plug for spraying impurities into the collecting cavity; a return spring is provided in the collecting cavity with one end connected to the guide plug and the other end connected to the inner wall of the collecting cavity; a guide slope is also provided on the peripheral side of the collecting seat near one end of the guide plug.

[0024] By adopting the above technical solution, when the driving cylinder drives the motor seat to move toward the side away from the pump body and the heat dissipation nozzle sprays heat dissipation airflow toward the outer wall of the pump body, the guide plug seals the embedded port under the elastic restoring force of the reset spring. At this time, the conical guide plug and the guide slope on the side of the collecting seat can guide the heat dissipation airflow, so that the heat dissipation airflow can flow along the guide plug and the guide slope and then be sprayed onto the outer wall of the pump body, thereby reducing the interference effect of the collecting seat on the heat dissipation airflow ejected from the heat dissipation nozzle.

[0025] The beneficial effect of the present invention is that when the pump body needs to work, the driving cylinder drives the motor seat to move toward the side away from the pump body, so that the driving gear and the first driven gear remain in a meshing state, and then the driving motor drives the driving gear to rotate, and the driving gear can drive the driving pulley to rotate through the first driven gear and the connecting shaft, and the driving pulley can drive the driving rotor to rotate through the belt and the driven pulley, and the driving rotor can drive the driven rotor to rotate through the gear transmission, so that the pump body is in a working state and attracts gas; the attracted gas will first enter the fixed box through the second tube body, and then the gas will enter the intake pipe after passing through the filter screen in the first tube body, and at this time, the particulate impurities in the gas can be filtered by the filter screen in the first tube body; at the same time, the driving motor also uses the driving gear to mesh with the second driven gear, and at this time the driving gear can drive the wheel shaft to rotate through the second driven gear, the transmission shaft, the second bevel gear and the first bevel gear, The impeller then drives the impeller in the casing to rotate. At this time, the driving motor can not only drive the active rotor to rotate but also drive the impeller to rotate. The rotation of the impeller can generate suction in the suction vertical pipe. At this time, the suction vertical pipe relies on the upper end to suck in external air. The heat dissipation nozzle is provided at the air outlet of the casing facing the outer wall of the middle of the pump body. Therefore, the impeller attracts external air through the upper end of the suction vertical pipe and then sprays the air on the outer wall of the pump body through the heat dissipation nozzle. Since the heat dissipation nozzle is facing the collecting seat, the gas can be evenly sprayed on the outer wall of the pump body after flowing along the guide plug and the guide slope. At this time, the gas can take away the heat on the heat dissipation fins after passing through the heat dissipation fins on the outer wall of the pump body, which is ultimately beneficial to the heat dissipation of the pump body. During the whole process, the driving motor drives the pump body to work and also drives the impeller in the casing to rotate continuously to form an airflow for dissipating heat to the surface of the pump body, thereby ensuring that the pump body works efficiently. When the pump body has been used for a period of time, the driving cylinder drives the motor seat to move toward the side close to the pump body. At this time, the driving gear will first disengage from the first driven gear, and then the driving rotor and the driven rotor will stop rotating after the belt stops driving, and the pump body is in a shutdown state; at the same time, as the motor seat moves toward the side close to the pump body, the centrifugal fan, the suction vertical pipe and the suction horizontal pipe can move toward the side close to the pump body, and then the suction sleeve can be docked with the first pipe body, and the heat dissipation nozzle pushes the guide plug into the collection cavity, while the baffle on the side wall of the fixed box covers the suction At the upper end of the vertical suction pipe, the baffle can seal the upper end surface of the vertical suction pipe; then the suction force generated by the impeller can act on the horizontal suction pipe and the suction sleeve, and the suction sleeve can absorb the particulate impurities filtered out by the filter screen, thereby preventing the presence of the particulate impurities from affecting the flow rate of the gas in the first tube body; at the same time, after the particulate impurities are ejected from the heat dissipation nozzle, they can enter the collection cavity along the multiple guide channels around the guide plug; and after passing through the collection cavity, the particulate impurities can enter the filter bag, and finally the particulate impurities can be efficiently collected by the filter bag; At the same time, when the driving cylinder drives the motor base to move toward the side away from the pump body, the driving gear and the first driven gear are meshed, and then the driving gear can drive the driving rotor and the driven rotor in the pump body to work through the belt; at the same time, the driving cylinder will also use the connecting arm to drive the tensioning rubber platform to press against the belt, thereby tensioning the belt through the tensioning rubber platform; when the tensioning force of the tensioning rubber platform on the belt is insufficient, the piston rod of the driving cylinder continues to move toward the through hole, and the connecting spring continues to be compressed. At this time, the piston rod of the driving cylinder can continue to drive the tensioning rubber platform to move toward one side of the belt through the connecting arm, thereby increasing the tensioning force of the tensioning rubber platform on the belt, and ultimately it is beneficial to complete the stable tensioning of the belt by extending and retracting the piston rod of the driving cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a schematic diagram of the structure of the present invention located on the front side of the pump body; Figure 2 It is a partial cross-sectional view of the connection relationship between the pump body, the fixed box, the suction sleeve and the suction transverse pipe in the present invention; Figure 3 This is a schematic diagram of the structure of the present invention located on the back side of the pump body; Figure 4 This is a cross-sectional view of the connection between the centrifugal fan and the collecting seat in the present invention, where the heat dissipation nozzle pushes the guide plug into the collecting cavity; Figure 5 yes Figure 3 Enlarged view of part A in the middle; Figure 6 This is an enlarged view of the structure of the collecting seat in the present invention; Figure 7 This is a structural plan view of the present invention. At this time, the driving gear and the first driven gear remain in meshing state, and the impeller draws external gas through the upper end of the suction vertical pipe and then sprays the gas onto the outer wall of the pump body through the heat dissipation nozzle; Figure 8 This is a structural plan view of the present invention. At this time, the driving gear is disengaged from the first driven gear, and the heat dissipation nozzle pushes the guide plug into the collection cavity. The suction force generated by the impeller acts on the suction cross pipe and the suction sleeve. The suction sleeve absorbs the particulate impurities filtered out by the filter screen and sends them into the filter bag.

[0028] In the figure, 1. pump body; 11. driving rotor; 111. driven pulley; 112. belt; 12. driven rotor; 13. air inlet pipe; 14. air outlet pipe; 15. heat dissipation fin; 2. driving motor; 21. motor seat; 211. second bearing seat; 22. driving gear; 3. seat plate; 31. first bearing seat; 311. connecting shaft; 312. first driven gear; 313. driving pulley; 4. fixing box; 41. first pipe body; 411. filter screen; 42. second pipe body; 43. suction sleeve; 431. suction horizontal pipe; 44. guide sleeve; 45. baffle; 5. suction device; 51. suction vertical pipe; 52. centrifugal fan; 521. housing; 5211. heat dissipation nozzle; 52 2. Air inlet pipe; 523. Gear box; 524. Axle; 525. First bevel gear; 526. Transmission shaft; 5261. Second driven gear; 527. Second bevel gear; 53. Sliding assembly; 531. Dovetail slider; 532. Dovetail slide; 533. Driving cylinder; 5331. First retaining ring; 5332. Second retaining ring; 5333. Connecting spring; 5334. Connecting arm; 53341. Tensioning rubber platform; 534. Connecting ear; 5341. Through hole; 6. Collecting seat; 61. Collecting cavity; 62. Embedding port; 63. Fixed arm; 64. Conduit; 641. Filter bag; 65. Guide plug; 651. Diversion channel; 66. Return spring; 67. Diversion slope. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0030] A Roots vacuum pump, see Figure 1 、 Figure 2 The Roots vacuum pump includes a pump body 1, a driving rotor 11, a driven rotor 12, a driving motor 2, an air inlet pipe 13, an air outlet pipe 14, a base plate 3 and a fixed box 4, wherein the driving rotor 11 and the driven rotor 12 are both rotatably connected to the pump body 1 through bearings, and the driving rotor 11 drives the driven rotor 12 to rotate through gear transmission. Since the internal structure of the pump body 1 is the existing technology, the internal structure of the pump body 1 is not described here; at the same time, the driving motor 2 is located outside the pump body 1 and is used to drive the driving rotor 11 to rotate, and the air inlet pipe 13 is integrally arranged on the upper side of the pump body 1 and is used for air intake, and the air outlet pipe 14 is integrally arranged on the lower side of the pump body 1 and is used for air outlet.

[0031] Reference Figure 1 、 Figure 2The seat plate 3 is used to support the pump body 1 and the drive motor 2, and the pump body 1 is fixed to the seat plate 3 by supporting legs and bolts, wherein the fixed box 4 is located above the air intake pipe 13, and the lower end of the fixed box 4 is integrally provided with a first tube body 41 that is connected to the air intake pipe 13 by bolts. At the same time, the upper end of the fixed box 4 is integrally provided with a second tube body 42, and a filter screen 411 is fixed in the first tube body 41 by bolts, and the filter screen 411 is in a conical shape with an opening downward; wherein a suction sleeve 43 with a closed upper end and an open lower end is provided in the lower end of the fixed box 4, and a suction cross pipe 431 is integrally provided on one side of the suction sleeve 43, and a guide sleeve 44 for the suction cross pipe 431 to pass through is integrally provided on the side of the fixed box 4; at this time, the suction cross pipe 431 can drive the suction sleeve 43 to move back and forth along the direction of the guide sleeve 44, and when the suction sleeve 43 moves toward the side close to the first tube body 41, it can be connected with the first tube body 41.

[0032] Reference Figure 3 、 Figure 4 , a suction device 5 is also provided on the seat plate 3 for providing suction to the suction transverse pipe 431 when the suction sleeve 43 is docked with the first tube body 41, and the suction device 5 includes a suction vertical pipe 51, a centrifugal fan 52, and a sliding assembly 53, wherein the suction vertical pipe 51 is integrally arranged at one end of the suction transverse pipe 431 away from the suction sleeve 43, and the upper end of the suction vertical pipe 51 is open and communicated with the outside, and at the same time, a baffle 45 is welded on the side wall of the fixed box 4 to cover the upper end of the suction vertical pipe 51 when the suction sleeve 43 is docked with the first tube body 41; at the same time, the centrifugal fan 52 is installed at the lower end of the suction vertical pipe 51, and the centrifugal fan 52 includes a casing 521, an air inlet pipe 522, a gear box 523, an axle 524, a first bevel gear 525, a transmission shaft 526, and a second bevel gear 527, wherein the casing 521 is located An impeller is rotatably connected to the lower portion of the suction riser 51, and an air inlet pipe 522 is integrally arranged at the air inlet of the casing 521 and is connected to the lower end of the suction riser 51 by bolts; at the same time, a heat dissipation nozzle 5211 is integrally provided at the air outlet of the casing 521 facing the outer wall of the middle part of the pump body 1, and a plurality of heat dissipation fins 15 are welded to the outer walls on both sides of the pump body 1; the gear box 523 is welded to the lower side of the casing 521, and the axle 524 is rotatably connected to the lower side of the casing 521 through a bearing and the upper end is fixedly connected to the impeller by bolts, while the first bevel gear 525 is keyed to the lower end of the axle 524, and the transmission shaft 526 is rotatably connected to the side of the gear box 523 through a bearing, wherein the second bevel gear 527 is keyed to the end of the transmission shaft 526 and meshes with the first bevel gear 525.

[0033] Reference Figure 1 、 Figure 3The driving motor 2 is located at the end of the base plate 3 away from the pump body 1, and the motor base 21 is fixed to the lower side of the driving motor 2 by bolts, wherein the output shaft of the driving motor 2 is keyed to the driving gear 22, and the first bearing seat 31 is fixed to the base plate 3 by bolts, and the first bearing seat 31 is rotatably connected to the connecting shaft 311. At the same time, one end of the connecting shaft 311 is keyed to the first driven gear 312 meshing with the driving gear 22, and the end of the connecting shaft 311 away from the first driven gear 312 is keyed to the driving pulley 313, wherein the end of the driving rotor 11 is keyed to the driven pulley 111, and a belt 112 is provided between the driving pulley 313 and the driven pulley 111, and the transmission shaft 526 is keyed to the second driven gear 5261 meshing with the driving gear 22 at one end away from the second bevel gear 527, and the motor base 21 is also fixed with a second bearing seat 211 for the transmission shaft 526 to be rotatably connected through the bearing.

[0034] Reference Figure 3 、 Figure 5 The sliding assembly 53 includes a dovetail slider 531 integrally provided on the lower surface of the motor base 21, a dovetail slide groove 532 provided on the base plate 3 and for the dovetail slider 531 to be embedded, a driving cylinder 533 fixed to the base plate 3 by bolts, and a connecting ear 534 welded to the side of the motor base 21 and for the piston rod end of the driving cylinder 533 to be connected; wherein the connecting ear 534 is provided with a through hole 5341 for the piston rod of the driving cylinder 533 to pass through, and a first retaining ring 5331 is welded to the end of the piston rod of the driving cylinder 533, and a second retaining ring 5331 is welded to the piston rod of the driving cylinder 533 and located on the side of the connecting ear 534 away from the first retaining ring 5331. Ring 5332, and the piston rod of the driving cylinder 533 is provided with a connecting spring 5333 at one end welded to the second baffle ring 5332 and the other end welded to the connecting ear 534, wherein the piston rod of the driving cylinder 533 is also welded with a connecting arm 5334 extending toward the side of the belt 112, and the end of the connecting arm 5334 away from the driving cylinder 533 is bonded with a tensioning rubber platform 53341 that is pressed against the belt 112, and at the same time, the belt 112 extends obliquely downward from the driven pulley 111 toward the side of the driving pulley 313; when the driving gear 22 and the first driven gear 312 are engaged, the dovetail slider 531 moves to the extreme position at the end of the dovetail slot 532.

[0035] Reference Figure 3 、 Figure 4 、 Figure 6A collecting seat 6 is provided between the pump body 1 and the casing 521, and a collecting cavity 61 is provided in the collecting seat 6 for embedding the heat dissipation nozzle 5211, wherein an embedding port 62 is provided at one end of the collecting seat 6 for passing the heat dissipation nozzle 5211, and a fixing arm 63 is welded to the lower side of the collecting seat 6 and fixedly connected to the seat plate 3 by bolts, and a conduit 64 communicating with the collecting cavity 61 is also integrally provided on the lower side of the collecting seat 6, and the lower end of the conduit 64 is connected to the collecting cavity 61 by a hoop. A filter bag 641 is connected; a conical guide plug 65 is provided in the embedding port 62 and is pushed by the heat dissipation nozzle 5211, and a plurality of guide channels 651 are provided on the peripheral side of the guide plug 65 for spraying impurities into the collecting cavity 61. At the same time, a return spring 66 is provided in the collecting cavity 61, one end of which is welded to the guide plug 65 and the other end is welded to the inner wall of the collecting cavity 61, and a guide slope 67 is also provided on the peripheral side of the collecting seat 6 near one end of the guide plug 65.

[0036] Principle: When the pump body 1 needs to work, the driving cylinder 533 drives the motor base 21 to move toward the side away from the pump body 1, so that the driving gear 22 and the first driven gear 312 remain in a meshing state, and then the driving motor 2 drives the driving gear 22 to rotate. The driving gear 22 can drive the driving pulley 313 to rotate through the first driven gear 312 and the connecting shaft 311, and the driving pulley 313 can drive the driving rotor 11 to rotate through the belt 112 and the driven pulley 111, and the driving rotor 11 can drive the driven rotor 12 to rotate through the gear transmission, thereby The pump body 1 is in working state and then attracts gas; the attracted gas first enters the fixed box 4 through the second tube body 42, and then passes through the filter 411 in the first tube body 41 and enters the air inlet pipe 13. At this time, the filter 411 in the first tube body 41 can filter the particulate impurities in the gas; at the same time, the driving motor 2 also uses the driving gear 22 to mesh with the second driven gear 5261. At this time, the driving gear 22 can pass through the second driven gear 5261, the transmission shaft 526, the second bevel gear 527 and the first bevel gear 5 25 drives the wheel shaft 524 to rotate, and then the wheel shaft 524 can drive the impeller in the casing 521 to rotate. At this time, the driving motor 2 can not only drive the active rotor 11 to rotate but also drive the impeller to rotate. The rotation of the impeller can generate suction to the suction vertical pipe 51. At this time, the suction vertical pipe 51 relies on the upper end to inhale external air. The heat dissipation nozzle 5211 facing the outer wall of the middle part of the pump body 1 is provided at the air outlet of the casing 521. Therefore, the impeller absorbs external air through the upper end of the suction vertical pipe 51 and then sprays the air outside the pump body 1 through the heat dissipation nozzle 5211. On the wall, since the heat dissipation nozzle 5211 is facing the collecting seat 6, the gas can be evenly sprayed on the peripheral outer wall of the pump body 1 after diverging along the guide plug 65 and the guide slope 67. At this time, the gas can take away the heat on the heat dissipation fins 15 after passing through the heat dissipation fins 15 on the outer wall of the pump body 1, which is ultimately beneficial to the heat dissipation of the pump body 1. During the whole process, the driving motor 2 drives the pump body 1 to work and also drives the impeller in the casing 521 to rotate continuously to form an airflow for dissipating heat to the surface of the pump body 1, thereby ensuring that the pump body 1 works efficiently. Among them, when the pump body 1 has been used for a period of time, the driving cylinder 533 is used to drive the motor base 21 to move toward the side close to the pump body 1. At this time, the driving gear 22 will first disengage from the first driven gear 312, and then the belt 112 stops driving and the driving rotor 11 and the driven rotor 12 can stop rotating, and the pump body 1 is in a shutdown state; at the same time, as the motor base 21 moves toward the side close to the pump body 1, the centrifugal fan 52, the suction vertical pipe 51 and the suction horizontal pipe 431 can move toward the side close to the pump body 1, and then the suction sleeve 43 can be docked with the first tube body 41, and the heat dissipation nozzle 5211 pushes the guide plug 65 into the collection cavity 61, and the baffle 45 on the side wall of the fixed box 4 It covers the upper end of the vertical suction pipe 51. At this time, the baffle 45 can seal the upper end surface of the vertical suction pipe 51. Then, the suction force generated by the impeller can act on the horizontal suction pipe 431 and the suction sleeve 43. At this time, the suction sleeve 43 can absorb the particulate impurities filtered out by the filter 411, thereby preventing the presence of the particulate impurities from affecting the flow rate of the gas in the first tube body 41. At the same time, after the particulate impurities are ejected from the heat dissipation nozzle 5211, they can enter the collection cavity 61 along the multiple guide channels 651 on the side of the guide plug 65. After passing through the collection cavity 61, the particulate impurities can enter the filter bag 641, and finally the particulate impurities can be efficiently collected by the filter bag 641. At the same time, when the driving cylinder 533 drives the motor base 21 to move toward the side away from the pump body 1, the driving gear 22 and the first driven gear 312 are engaged, and then the driving gear 22 can drive the driving rotor 11 and the driven rotor 12 in the pump body 1 to work through the belt 112; at the same time, the driving cylinder 533 also uses the connecting arm 5334 to drive the tensioning rubber platform 53341 to press against the belt 112, thereby tensioning the belt 112 through the tensioning rubber platform 53341; wherein, when the tensioning rubber platform 53 When the tensioning force of 341 on the belt 112 is insufficient, the piston rod of the driving cylinder 533 continues to move toward the through hole 5341, and the connecting spring 5333 continues to be compressed. At this time, the piston rod of the driving cylinder 533 can continue to drive the tensioning rubber platform 53341 to move toward the side of the belt 112 through the connecting arm 5334, thereby increasing the tensioning force of the tensioning rubber platform 53341 on the belt 112, and finally it is conducive to completing the stable tensioning of the belt 112 by extending and retracting the piston rod of the driving cylinder 533.

Claims

1. A Roots vacuum pump, comprising a pump body (1), a driving rotor (11) rotatably connected to the pump body (1), a driven rotor (12) rotatably connected to the pump body (1) and connected to the driving rotor (11) through a gear transmission, a drive motor (2) located outside the pump body (1) and used to drive the driving rotor (11) to rotate, an air inlet pipe (13) arranged on the upper side of the pump body (1), and an air outlet pipe (14) arranged on the lower side of the pump body (1), characterized in that: It also comprises a base plate (3) for supporting the pump body (1) and the drive motor (2), and a fixed box (4) arranged above the air intake pipe (13); a first tube body (41) is arranged at the lower end of the fixed box (4) and is connected to the air intake pipe (13); a second tube body (42) is arranged at the upper end of the fixed box (4); a filter screen (411) is arranged in the first tube body (41); a suction sleeve (43) with a closed upper end and an open lower end is arranged in the lower end of the fixed box (4); a suction transverse pipe (431) is arranged on one side of the suction sleeve (43); a guide sleeve (44) is arranged at the side of the fixed box (4) for the suction transverse pipe (431) to pass through; and a suction device (5) is arranged on the base plate (3) for providing suction to the suction transverse pipe (431) when the suction sleeve (43) is connected to the first tube body (41).

2. A Roots vacuum pump according to claim 1, characterized in that: The filter screen (411) is in the shape of a cone with an opening facing downward.

3. A Roots vacuum pump according to claim 1, characterized in that: The suction device (5) comprises a suction vertical pipe (51) arranged at one end of the suction horizontal pipe (431) away from the suction sleeve (43), a centrifugal fan (52) arranged at the lower end of the suction vertical pipe (51), and a sliding component (53) arranged on the base plate (3) and used to drive the suction horizontal pipe (431) to extend and retract in the guide sleeve (44).

4. A Roots vacuum pump according to claim 3, characterized in that: The centrifugal fan (52) comprises a casing (521) rotatably connected to an impeller inside, an air inlet pipe (522) arranged at an air inlet of the casing (521) and connected to the lower end of the suction vertical pipe (51), a gear box (523) arranged at the lower side of the casing (521), a wheel shaft (524) rotatably connected to the lower side of the casing (521) and connected to the impeller at the upper end, a first bevel gear (525) arranged at the lower end of the wheel shaft (524), and a gear box (523) rotatably connected to the side of the gear box (523). The drive motor (2) is located at one end of the seat plate (3) away from the pump body (1); a motor seat (21) is provided on the lower side of the drive motor (2); a driving gear (22) is provided on the output shaft of the drive motor (2); a first bearing seat (31) is provided on the seat plate (3); a connecting shaft (311) is rotatably connected to the first bearing seat (31); a first driven gear (312) meshing with the driving gear (22) is provided at one end of the connecting shaft (311); a driving pulley (313) is provided at one end of the connecting shaft (311) away from the first driven gear (312); a driven pulley (111) is provided at the end of the driving rotor (11); a belt (112) is provided between the driving pulley (313) and the driven pulley (111); and the drive shaft ( A second driven gear (5261) meshing with the driving gear (22) is provided at one end of the first gear (526) away from the second bevel gear (527), a second bearing seat (211) rotatably connected to the transmission shaft (526) is provided on the motor seat (21), the upper end of the suction vertical pipe (51) is communicated with the outside, and a baffle (45) covering the upper end of the suction vertical pipe (51) is provided on the side wall of the fixed box (4) when the suction sleeve (43) is connected to the first tube body (41).

5. A Roots vacuum pump according to claim 4, characterized in that: A heat dissipation nozzle (5211) is arranged at the air outlet of the casing (521) and is directly opposite to the middle outer wall of the pump body (1), and a plurality of heat dissipation fins (15) are arranged on the outer walls on both sides of the pump body (1).

6. A Roots vacuum pump according to claim 4, characterized in that: The sliding assembly (53) comprises a dovetail slider (531) disposed on the lower surface of the motor base (21), a dovetail slide groove (532) provided on the base plate (3) and into which the dovetail slider (531) is inserted, a driving cylinder (533) disposed on the base plate (3), and a connecting ear (534) disposed on the side of the motor base (21) and to which the end of the piston rod of the driving cylinder (533) is connected.

7. A Roots vacuum pump according to claim 6, characterized in that: The connecting ear (534) is provided with a through hole (5341) for the piston rod of the driving cylinder (533) to pass through; the end of the piston rod of the driving cylinder (533) is provided with a first retaining ring (5331); a second retaining ring (5332) is provided on the piston rod of the driving cylinder (533) and is located at a position on the side of the connecting ear (534) away from the first retaining ring (5331); a connecting spring (5333) is sleeved on the piston rod of the driving cylinder (533) and one end of the spring is connected to the second retaining ring (5332) and the other end is connected to the connecting ear (534); A connecting arm (5334) extending toward one side of the belt (112) is provided on the piston rod of the driving cylinder (533); a tensioning rubber platform (53341) pressed against the belt (112) is provided at one end of the connecting arm (5334) away from the driving cylinder (533); the belt (112) extends obliquely downward from the driven pulley (111) toward one side of the driving pulley (313); when the driving gear (22) and the first driven gear (312) are meshed, the dovetail slider (531) moves to the extreme position at the end of the dovetail slide groove (532).

8. A Roots vacuum pump according to claim 5, characterized in that: A collecting seat (6) is provided between the pump body (1) and the casing (521); a collecting cavity (61) is provided in the collecting seat (6) for the heat dissipation nozzle (5211) to be embedded; an embedding opening (62) is provided at one end of the collecting seat (6) for the heat dissipation nozzle (5211) to pass through; a fixing arm (63) connected to the seat plate (3) is provided at the lower side of the collecting seat (6); a conduit (64) communicating with the collecting cavity (61) is also provided at the lower side of the collecting seat (6); a filter bag (641) is provided at the lower end of the conduit (64).

9. A Roots vacuum pump according to claim 8, characterized in that: A conical guide plug (65) is provided in the insertion opening (62) and is pushed by the heat dissipation nozzle (5211). A plurality of guide channels (651) are provided on the peripheral side of the guide plug (65) for spraying impurities into the collection cavity (61). A return spring (66) is provided in the collection cavity (61), one end of which is connected to the guide plug (65) and the other end of which is connected to the inner wall of the collection cavity (61). A guide slope (67) is also provided on the peripheral side of the collection seat (6) near one end of the guide plug (65).

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