Constant-diameter variable-pitch multi-stage roots vacuum pump

Abstract

The utility model discloses a kind of equal-diameter variable-pitch multistage roots vacuum pumps, relate to vacuum pump technical field.This kind of equal-diameter variable-pitch multistage roots vacuum pump, including pump body and motor, the pump body includes air inlet pipe and air outlet pipe, the pump body is rotatably connected with first rotating shaft and second rotating shaft, and the side wall of first rotating shaft and second rotating shaft is fixedly connected with rotor, the side wall of the pump body is fixedly connected with cooling tank, and the side wall of cooling tank is fixedly connected with liquid supply pipe and liquid return pipe.This kind of equal-diameter variable-pitch multistage roots vacuum pump, cooling liquid flow channel is arranged in first rotating shaft and second rotating shaft, and cooling liquid is circulated, can be very good cooling effect to rotor, guarantee its use effect and life;Impurities on the surface of filter screen are cleaned and collected simultaneously, and simultaneously, reciprocating knocking vibration can be carried out to the inner wall of filter screen, guarantee its filtering efficiency and effect, and then guarantee the use efficiency and effect of vacuum pump.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically to a constant diameter variable pitch multistage Roots vacuum pump. Background Technology

[0002] The constant-diameter variable-pitch multistage Roots vacuum pump is a type of vacuum pump that achieves a higher compression ratio through a multistage variable-pitch rotor design. Its core feature is the combination of a constant-diameter rotor and a variable-pitch tooth structure. It improves gas handling efficiency through staged compression. The pump body contains a pair of synchronously rotating left and right rotors with identical structures and three-stage toothed sub-rotors. The sum of the addendum circle radius and the dedendum circle radius of each sub-rotor remains constant, but the radii of each stage change sequentially: the addendum circle decreases, and the dedendum circle increases, forming a trapezoidal cross-sectional profile. A small gap is maintained between the rotor and the pump casing inner wall to achieve contactless operation. Through the series connection of multiple sub-rotors, the intake volume of each stage gradually decreases, achieving staged gas compression. The number of teeth on each sub-rotor is fixed at three, but the difference in tooth size at each stage optimizes volume utilization. After entering from the intake side, the gas is separated into different sub-rotor chambers as the rotor rotates. Due to the decreasing addendum circle radius at each stage, the gas undergoes multiple compressions within the pump and is finally discharged from the exhaust side. The variable pitch design allows the volumetric compression ratio to be increased step by step while maintaining a constant overall rotor outer diameter (i.e., "equal diameter"), simplifying mechanical adaptability.

[0003] However, when using existing equal diameter variable pitch multistage Roots vacuum pumps, the rotor will heat up and may expand due to the temperature rise, resulting in poor heat dissipation, which affects its performance and lifespan. In addition, impurities in the outside air can easily enter the pump body, which will also affect its performance and lifespan. Utility Model Content

[0004] The purpose of this invention is to provide a constant diameter variable pitch multistage Roots vacuum pump to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a constant-diameter variable-pitch multistage Roots vacuum pump, comprising a pump body and a motor. The pump body includes an inlet pipe and an outlet pipe. A first rotating shaft and a second rotating shaft are rotatably connected within the pump body, and rotors are fixedly connected to the side walls of both the first and second rotating shafts. A cooling box is fixedly connected to the side wall of the pump body, and a liquid supply pipe and a liquid return pipe are fixedly connected to the side wall of the cooling box. A first circular hole is formed at the end of the first rotating shaft, and a through-hole is formed at the end of the second rotating shaft. The side wall of the first rotating shaft is fixedly connected to the motor. The device is fitted with a first annular cover, which is connected to a first circular hole through a through hole. A rotating ring is rotatably connected inside the first annular cover, and the other end of the liquid supply pipe is fixedly inserted into the side wall of the rotating ring. A first connecting pipe is inserted into one end of the second circular hole and is fixed to the liquid supply pipe. A second connecting pipe is inserted into the ends of both the first and second circular holes and is fixed to the return pipe. The inlet of the air inlet pipe is equipped with a filter mechanism for filtering the gas, and the side wall of the liquid supply pipe is equipped with a circulation mechanism for circulating the coolant.

[0006] Preferably, the filtration mechanism includes a bracket fixedly connected to the side wall of the motor, and a second annular cover fixedly connected to the top of the bracket. A rotating disk is rotatably connected to the top of the second annular cover, and an exhaust pipe is fixedly connected to the side wall of the second annular cover. The inlet of the exhaust pipe is fixedly connected to the bottom of the second annular cover, and a mounting plate is fixedly connected to the bottom of the rotating disk. A filter screen arranged in a ring is fixedly connected to the bottom of the mounting plate, and multiple arrayed baffles are fixedly connected to the side wall of the filter screen. A cleaning mechanism for cleaning and collecting impurities on the surface of the filter screen is provided on the second annular cover, and a vibration mechanism for tapping and vibrating the inner wall of the filter screen is provided inside the second annular cover.

[0007] Preferably, the circulation mechanism includes a fixed box that is fixedly inserted into the side wall of the liquid supply pipe, and a rotating fan is rotatably connected inside the fixed box via a first rotating rod, the upper end of the first rotating rod being fixed to the bottom of the mounting plate.

[0008] Preferably, the cleaning mechanism includes a sliding plate slidably connected between two adjacent baffles, and the sliding plate is connected to the top of the rotating disk through a lifting mechanism. Two symmetrically arranged first springs are fixedly connected to the bottom of the sliding plate. A scraper is fixedly connected to the lower end of the first spring, and an insertion hole is opened on the top of the scraper. A first push rod is fixedly connected to the bottom of the sliding plate, and a conical cover is fixedly inserted into the bottom of the second annular cover. A collection box is fixedly connected to the bottom of the conical cover, and a rotating plate is rotatably connected to the top of the conical cover through a torque shaft.

[0009] Preferably, the lifting mechanism includes two symmetrically arranged movable rods fixedly connected to the top of each sliding plate, and a stop block is fixedly connected to the upper end of each movable rod. A second spring is sleeved on the side wall of each movable rod, and a second push rod is fixedly connected to the side wall of the stop block. A mounting frame is fixedly connected to the top of the bracket, and a push block is fixedly connected to the top of the mounting frame. The side wall of the push block is provided with an inclined surface.

[0010] Preferably, the vibration mechanism includes a fan-shaped groove formed on the top of the rotating disk, and the fan-shaped groove extends through the bottom of the mounting disk. A slider is slidably connected in the fan-shaped groove, and a telescopic cover is fixedly connected between the slider and the fan-shaped groove. A moving block is connected to the side wall of the stop block through a reset mechanism, and a second rotating rod is rotatably connected to the bottom of the moving block. The second rotating rod extends through the top of the slider, and a fixing ring is fixedly sleeved on the side wall of the second rotating rod. A ball is connected to the side wall of the fixing ring through a telescopic mechanism. The rotation of the second rotating rod is driven by a driving mechanism, and the sliding of the slider is pushed by a pushing mechanism.

[0011] Preferably, the telescopic mechanism includes a first sleeve fixedly connected to the side wall of the fixed ring, and a first sliding disc slidably connected inside the first sleeve. A first sleeve rod is fixedly connected to the end of the first sliding disc, and the other end of the first sleeve rod is fixed to the side wall of the sphere. A third spring is sleeved on the side wall of each first sleeve rod.

[0012] Preferably, the driving mechanism includes a spiral groove formed on the side wall of the second rotating rod, and a support block is fixedly connected to the top of the rotating disk. A first push pin is fixedly connected to the side wall of the support block, and the first push pin is inserted into the spiral groove.

[0013] Preferably, the pushing mechanism includes a mounting plate fixedly connected to the bottom of the moving block, a plurality of first triangular blocks arranged in an array and a plurality of second triangular blocks arranged in an array are fixedly connected to the side wall of the mounting plate, and a fixing plate is fixedly connected to the top of the rotating disk, and a second pushing pin is fixedly connected to the side wall of the fixing plate.

[0014] Preferably, the reset mechanism includes a first connecting block fixedly connected to the side wall of the stop block, and a second sleeve rotatably connected to the side wall of the first connecting block. A second sliding disc is slidably connected inside the second sleeve, and a second sleeve rod is fixedly connected to the end of the second sliding disc. The other end of the second sleeve rod is rotatably connected to the side wall of the moving block, and a fourth spring is fixedly connected between the second sliding disc and the second sleeve.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) This type of equal-diameter variable-pitch multistage Roots vacuum pump, by setting up a filter mechanism and a circulation mechanism, when in use, the motor is started, and the rotor is driven to rotate through the first and second rotating shafts. At the same time, the air is drawn in through the air inlet pipe. The air after multistage compression is discharged through the air outlet pipe. When the air inlet pipe is drawing air, the outside air enters the second annular cover through the air inlet pipe and impacts the surface of the baffle, causing the filter screen, mounting plate and rotating plate to rotate. Moreover, after being filtered by the filter screen, the air enters the pump body through the air inlet pipe for multistage compression, avoiding the influence of impurities and ensuring its use. In terms of performance and lifespan, when the mounting plate rotates, it drives the first rotating rod to rotate, which in turn drives the rotating fan to rotate. At this time, the coolant can be circulated, allowing the coolant in the cooling tank to enter the first annular cover through the supply pipe, and then enter the first circular hole of the first rotating shaft through the through hole, before returning to the cooling tank through the return pipe. At the same time, it enters the second circular hole through the first connecting pipe, and then returns to the cooling tank through the second connecting pipe and the return pipe. This circulates the coolant in the first and second rotating shafts, thereby achieving a good cooling effect on the rotor and ensuring its performance and lifespan.

[0017] (2) This type of equal diameter variable pitch multistage Roots vacuum pump, by setting a cleaning mechanism, etc., when the rotating disk rotates, the lifting mechanism drives the scraper to rotate synchronously. When the scraper gradually rotates to the top of the conical cover, the second push rod can slide down along the side wall of the inclined surface, thereby pushing the stop block to move down. At the same time, the second spring is compressed. When the moving rod moves down, it can drive the sliding plate to move down. At the same time, the first spring drives the scraper to move down. At this time, the scraper can scrape and clean the impurities on the surface of the filter screen. When the scraped impurities abut against the top of the rotating plate, they can be squeezed. When the sliding plate continues to move down, the first spring can be compressed. At this time, the first push rod passes through the insertion hole and abuts against the top of the rotating plate, thereby rotating the rotating plate downward and opening it, so that the squeezed impurities can enter the conical cover and fall into the collection box for collection, which is convenient for cleaning and collecting impurities on the surface of the filter screen, ensuring its filtration efficiency and effect, and thus ensuring the efficiency and effect of the vacuum pump.

[0018] (3) This type of equal-diameter variable-pitch multistage Roots vacuum pump, by setting a vibration mechanism, etc., when the stop block 502 moves downward, it can drive the moving block and the second rotating rod to move downward through the reset mechanism. At the same time, the first push pin slides along the side wall of the spiral groove, thereby driving the second rotating rod to rotate. When the second rotating rod rotates, it can drive the ball to rotate through the fixed ring and the telescopic mechanism. Under the action of centrifugal force, the ball moves away from the first sleeve. At the same time, the third spring is compressed. When the ball abuts against the inner wall of the filter screen, it can knock and vibrate it. At the same time, it can push the ball to move closer to the first sleeve, ensuring that it can cross the filter screen. By repeatedly striking the inner wall of the filter screen, the ball vibrates against it, resulting in higher efficiency and better cleaning of impurities. Furthermore, as the moving block moves downwards, it causes the first and second triangular blocks to move downwards as well, allowing the second push pin to slide sequentially along the side walls of the first and second triangular blocks. This pushes the slider to slide back and forth along the fan-shaped groove. Simultaneously, the fourth spring deforms, causing the second sleeve and second sleeve rod to rotate adaptively. As the slider slides back and forth, it drives the second rotating rod and the fixed ring to move back and forth, increasing the range of the ball's impact vibration and further enhancing the cleaning efficiency and effectiveness of impurities. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective;

[0021] Figure 3 This is a schematic diagram showing the location of the filtration mechanism in this utility model;

[0022] Figure 4 This is a schematic diagram of the filtration mechanism in this utility model;

[0023] Figure 5 This is a partial cross-sectional view of the second annular cover in this utility model;

[0024] Figure 6 This is a cross-sectional view of the second annular cover in this utility model;

[0025] Figure 7 for Figure 2 Enlarged structural diagram at point A;

[0026] Figure 8 for Figure 3 Enlarged structural diagram at point B;

[0027] Figure 9 for Figure 3Enlarged structural diagram at point C;

[0028] Figure 10 for Figure 4 Enlarged structural diagram at point D;

[0029] Figure 11 for Figure 5 Enlarged structural diagram at point E;

[0030] Figure 12 for Figure 6 Enlarged structural diagram at point F;

[0031] Figure 13 for Figure 10 A magnified structural diagram at point G in the middle;

[0032] Figure 14 for Figure 10 Enlarged structural diagram at point H;

[0033] Figure 15 for Figure 12 A magnified structural diagram of point I in the middle.

[0034] In the diagram: 101, Pump body; 102, Motor; 103, Inlet pipe; 104, Outlet pipe; 105, First rotating shaft; 106, Rotor; 107, Second rotating shaft; 201, Bracket; 202, Second annular cover; 203, Exhaust pipe; 204, Rotating disc; 205, Mounting disc; 206, Filter screen; 207, Baffle; 301, Fixing box; 302, First rotating rod; 303, Rotating fan. ; 401, Sliding plate; 402, First spring; 403, Scraper; 404, Insertion hole; 405, First push rod; 406, Conical cover; 407, Collection box; 408, Rotating plate; 501, Moving rod; 502, Stop block; 503, Second spring; 504, Second push rod; 505, Mounting bracket; 506, Push block; 507, Inclined surface; 601, Sector groove; 602, Slider; 6 03. Second rotating rod; 604. Telescopic cover; 605. Fixed ring; 606. Sphere; 607. Moving block; 701. First sleeve; 702. First sliding disc; 703. First sleeve rod; 704. Third spring; 801. Spiral groove; 802. Support block; 803. First push pin; 901. Fixed plate; 902. First triangular block; 903. Second triangular block; 904. Second push pin; 905. Mounting plate; 1001. First connecting block; 1002. Second sleeve; 1003. Second sliding disc; 1004. Fourth spring; 1005. Second sleeve rod; 11. Cooling box; 12. First round hole; 13. Second round hole; 14. Liquid supply pipe; 15. First annular cover; 16. Through hole; 17. Rotating ring; 18. First connecting pipe; 19. Liquid return pipe; 20. Second connecting pipe. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Please see Figures 1-15 This utility model provides a constant diameter variable pitch multistage Roots vacuum pump, including a pump body 101 and a motor 102. The pump body 101 includes an air inlet pipe 103 and an air outlet pipe 104. A first rotating shaft 105 and a second rotating shaft 107 are rotatably connected inside the pump body 101, and rotors 106 are fixedly connected to the side walls of both the first rotating shaft 105 and the second rotating shaft 107. A cooling box 11 is fixedly connected to the side wall of the pump body 101, and a liquid supply pipe 14 and a liquid return pipe 19 are fixedly connected to the side wall of the cooling box 11. A first circular hole 12 is opened at the end of the first rotating shaft 105, and a through-hole 13 is opened at the end of the second rotating shaft 107. A first annular cover 15 is fixedly sleeved on the side wall of the first rotating shaft 105, and the first annular cover 15 communicates with the first circular hole 12 through a through hole 16. A rotating ring 17 is rotatably connected inside the first annular cover 15, and the other end of the liquid supply pipe 14 is fixedly inserted into the... A first connecting pipe 18 is inserted into one end of the second circular hole 13 on the side wall of the rotating ring 17, and the first connecting pipe 18 is fixed to the liquid supply pipe 14. A second connecting pipe 20 is inserted into the ends of the first circular hole 12 and the second circular hole 13, and the second connecting pipe 20 is fixed to the liquid return pipe 19. The inlet of the air inlet pipe 103 is provided with a filter mechanism for filtering the gas, and the side wall of the liquid supply pipe 14 is provided with a circulation mechanism for circulating the coolant. Coolant flow channels are provided in the first rotating shaft 105 and the second rotating shaft 107, and the coolant is circulated, which can effectively cool the rotor 106, ensuring its performance and lifespan. It is also convenient to clean and collect impurities on the surface of the filter screen 206. At the same time, it can reciprocate and vibrate the inner wall of the filter screen 206 to ensure its filtration efficiency and effect, thereby ensuring the efficiency and effect of the vacuum pump.

[0037] The filtration mechanism includes a bracket 201 fixedly connected to the side wall of the motor 102, a second annular cover 202 fixedly connected to the top of the bracket 201, a rotating disk 204 rotatably connected to the top of the second annular cover 202, an exhaust pipe 203 fixedly connected to the side wall of the second annular cover 202, an inlet pipe 103 fixedly connected to the bottom of the second annular cover 202, a mounting disk 205 fixedly connected to the bottom of the rotating disk 204, a ring-shaped filter screen 206 fixedly connected to the bottom of the mounting disk 205, and multiple arrayed baffles 207 fixedly connected to the side wall of the filter screen 206. The second annular cover 202 is equipped with a cleaning mechanism for collecting and cleaning impurities from the surface of the filter screen 206, and a cleaning mechanism is provided inside the second annular cover 202. The vibration mechanism used to strike and vibrate the inner wall of the filter screen 206 operates by starting the motor 102, which drives the rotor 106 to rotate via the first rotating shaft 105 and the second rotating shaft 107. Simultaneously, air is drawn in through the air inlet pipe 103, and the multi-stage compressed air is discharged through the air outlet pipe 104. When the air inlet pipe 103 is drawing air, external air enters the second annular cover 202 through the air outlet pipe 203 and impacts the surface of the baffle 207, causing the filter screen 206, the mounting plate 205, and the rotating plate 204 to rotate. After being filtered by the filter screen 206, the air enters the pump body 101 through the air inlet pipe 103 for multi-stage compression, avoiding the influence of impurities and ensuring its effectiveness and lifespan.

[0038] The circulation mechanism includes a fixed box 301 fixedly inserted into the side wall of the liquid supply pipe 14, and a rotating fan 303 is rotatably connected inside the fixed box 301 via a first rotating rod 302. The upper end of the first rotating rod 302 is fixed to the bottom of the mounting plate 205. When the mounting plate 205 rotates, it can drive the first rotating rod 302 to rotate, thereby driving the rotating fan 303 to rotate. At this time, the coolant can be circulated.

[0039] The cleaning mechanism includes a sliding plate 401 slidably connected between two adjacent baffles 207. The sliding plate 401 is connected to the top of the rotating disk 204 via a lifting mechanism. Two symmetrically arranged first springs 402 are fixedly connected to the bottom of the sliding plate 401. A scraper 403 is fixedly connected to the lower end of the first spring 402, and an insertion hole 404 is provided on the top of the scraper 403. A first push rod 405 is fixedly connected to the bottom of the sliding plate 401. A conical cover 406 is fixedly inserted into the bottom of the second annular cover 202. A collection box 407 is fixedly connected to the bottom of the conical cover 406, and a rotating plate 408 is rotatably connected to the top of the conical cover 406 via a torque shaft. During filtration, when the rotating disk 204 rotates, the scraper 403 is driven to rotate synchronously via the lifting mechanism. As the scraper 403 gradually rotates to the conical cover 407, the scraper 408 rotates. When the filter screen 206 is above the top, the sliding plate 401 moves downward through the lifting mechanism. At the same time, the scraper 403 moves downward through the first spring 402. At this time, the scraper 403 can scrape and clean the impurities on the surface of the filter screen 206. When the scraped impurities come into contact with the top of the rotating plate 408, they can be squeezed. When the sliding plate 401 continues to move downward, the first spring 402 can be compressed. At this time, the first push rod 405 is driven to pass through the insertion hole 404 and come into contact with the top of the rotating plate 408, thereby rotating the rotating plate 408 downward and opening it. This allows the squeezed impurities to enter the conical cover 406 and fall into the collection box 407 for collection, which facilitates the cleaning and collection of impurities on the surface of the filter screen 206, ensuring its filtration efficiency and effect, and thus ensuring the efficiency and effect of the vacuum pump.

[0040] The lifting mechanism includes two symmetrically arranged movable rods 501 fixedly connected to the top of each sliding plate 401, and a stop block 502 fixedly connected to the upper end of each movable rod 501. A second spring 503 is sleeved on the side wall of each movable rod 501, and a second push rod 504 is fixedly connected to the side wall of the stop block 502. A mounting bracket 505 is fixedly connected to the top of the bracket 201, and a push block 506 is fixedly connected to the top of the mounting bracket 505. An inclined surface 507 is provided on the side wall of the push block 506. When the second push rod 504 can slide down along the side wall of the inclined surface 507, it pushes the stop block 502 to move down. At the same time, the second spring 503 is compressed. When the second push rod 504 passes over the inclined surface 507, the stop block 502 can move up and reset under the action of the second spring 503.

[0041] The vibration mechanism includes a sector-shaped groove 601 formed on the top of the rotating disk 204, and the sector-shaped groove 601 extends through the bottom of the mounting disk 205. A slider 602 is slidably connected within the sector-shaped groove 601, and a telescopic cover 604 is fixedly connected between the slider 602 and the sector-shaped groove 601. A moving block 607 is connected to the side wall of the stop block 502 via a reset mechanism, and a second rotating rod 603 is rotatably connected to the bottom of the moving block 607. The second rotating rod 603 extends through the top of the slider 602, and a fixing ring 605 is fixedly sleeved on the side wall of the second rotating rod 603. A ball 606 is connected to the side wall of the fixing ring 605 via a telescopic mechanism. The rotation of the second rotating rod 603 is driven by a drive mechanism, and the slider 602... The sliding mechanism pushes the movement downwards. When the stop block 502 moves downwards, it drives the moving block 607 and the second rotating rod 603 downwards through the reset mechanism. At the same time, the driving mechanism drives the second rotating rod 603 to rotate. When the second rotating rod 603 rotates, it drives the ball 606 to rotate through the fixed ring 605 and the telescopic mechanism. Under the action of centrifugal force, the ball 606 moves away from the fixed ring 605 under the action of the telescopic mechanism. When the ball 606 abuts against the inner wall of the filter screen 206, it can knock and vibrate it. At the same time, it can push the ball 606 to move closer to the fixed ring 605, ensuring that it can pass over the inner wall of the filter screen 206.

[0042] The telescopic mechanism includes a first sleeve 701 fixedly connected to the side wall of the fixed ring 605, and a first sliding disk 702 slidably connected inside the first sleeve 701. A first sleeve rod 703 is fixedly connected to the end of the first sliding disk 702. The other end of the first sleeve rod 703 is fixed to the side wall of the ball 606. A third spring 704 is sleeved on the side wall of each first sleeve rod 703 to guide and reset the movement of the ball 606.

[0043] The driving mechanism includes a spiral groove 801 formed on the side wall of the second rotating rod 603, and a support block 802 is fixedly connected to the top of the rotating disk 204. A first push pin 803 is fixedly connected to the side wall of the support block 802, and the first push pin 803 is inserted into the spiral groove 801. The first push pin 803 slides along the side wall of the spiral groove 801, thereby driving the second rotating rod 603 to rotate.

[0044] The pushing mechanism includes a mounting plate 905 fixedly connected to the bottom of the moving block 607. Multiple arrayed first triangular blocks 902 and multiple arrayed second triangular blocks 903 are fixedly connected to the side wall of the mounting plate 905. A fixing plate 901 is fixedly connected to the top of the rotating disk 204. A second push pin 904 is fixedly connected to the side wall of the fixing plate 901. When the moving block 607 moves downward, it can drive the first triangular blocks 902 and the second triangular blocks 903 to move downward, so that the second push pin 904 slides sequentially on the side wall of the first triangular blocks 902 and the second triangular blocks 903, thereby pushing the slider 602 to slide back and forth along the fan-shaped groove 601.

[0045] The reset mechanism includes a first connecting block 1001 fixedly connected to the side wall of the stop block 502, and a second sleeve 1002 rotatably connected to the side wall of the first connecting block 1001. A second sliding disk 1003 is slidably connected inside the second sleeve 1002, and a second sleeve rod 1005 is fixedly connected to the end of the second sliding disk 1003. The other end of the second sleeve rod 1005 is rotatably connected to the side wall of the moving block 607, and a fourth spring 1004 is fixedly connected between the second sliding disk 1003 and the second sleeve 1002, which plays a reset role in the movement of the moving block 607, thereby resetting the slider 602.

[0046] Working principle: When in use, the motor 102 is started, which drives the rotor 106 to rotate through the first rotating shaft 105 and the second rotating shaft 107. At the same time, the air is drawn in through the air inlet pipe 103. The air after multi-stage compression is discharged through the air outlet pipe 104. When the air inlet pipe 103 is drawing air, the outside air enters the second annular cover 202 through the air outlet pipe 203 and impacts the surface of the baffle 207, causing the filter screen 206, the mounting plate 205 and the rotating plate 204 to rotate. After being filtered by the filter screen 206, the air enters the pump body 101 through the air inlet pipe 103 for multi-stage compression, avoiding the influence of impurities and ensuring its performance and service life.

[0047] Meanwhile, when the mounting plate 205 rotates, it drives the first rotating rod 302 to rotate, which in turn drives the rotating fan 303 to rotate. At this time, the coolant can be circulated, so that the coolant in the cooling tank 11 can enter the first annular cover 15 through the supply pipe 14, and enter the first circular hole 12 of the first rotating shaft 105 through the through hole 16, and then return to the cooling tank 11 through the return pipe 19. At the same time, it enters the second circular hole 13 through the first connecting pipe 18 and returns the second connecting pipe 20 and the return pipe 19 to the cooling tank 11. Thus, the coolant in the first rotating shaft 105 and the second rotating shaft 107 can be circulated, thereby achieving a good cooling effect on the rotor 106 and ensuring its performance and service life.

[0048] During filtration, when the rotating disk 204 rotates, the lifting mechanism drives the scraper 403 to rotate synchronously. When the scraper 403 gradually rotates to the top of the conical cover 406, the second push rod 504 can slide downward along the side wall of the inclined surface 507, thereby pushing the stop block 502 downward. At the same time, the second spring 503 is compressed. When the moving rod 501 moves downward, it can drive the sliding plate 401 to move downward. Simultaneously, the first spring 402 drives the scraper 403 to move downward. At this time, the scraper 403 can scrape away impurities on the surface of the filter screen 206. When the scraped impurities come into contact with the top of the rotating plate 408, they can be squeezed. When the sliding plate 401 continues to move downward, the first spring 402 can be compressed. At this time, the first push rod 405 is driven to pass through the insertion hole 404 and come into contact with the top of the rotating plate 408, thereby rotating the rotating plate 408 downward and opening it. This allows the squeezed impurities to enter the conical cover 406 and fall into the collection box 407 for collection, which facilitates the cleaning and collection of impurities on the surface of the filter screen 206, ensuring its filtration efficiency and effect, and thus ensuring the efficiency and effect of the vacuum pump.

[0049] When the stop block 502 moves downward, it can drive the moving block 607 and the second rotating rod 603 to move downward through the reset mechanism. At the same time, the first push pin 803 slides along the side wall of the spiral groove 801, thereby driving the second rotating rod 603 to rotate. When the second rotating rod 603 rotates, it can drive the ball 606 to rotate through the fixed ring 605 and the telescopic mechanism. Under the action of centrifugal force, the ball 606 moves away from the first sleeve 701. At the same time, the third spring 704 is compressed. When the ball 606 abuts against the inner wall of the filter screen 206, it can knock and vibrate it. At the same time, it can push the ball 606 to move closer to the first sleeve 701, ensuring that it can pass over the inner wall of the filter screen 206. By repeating this process, the ball 606 can knock and vibrate the inner wall of the filter screen 206, thereby making the cleaning efficiency of impurities higher and the effect better.

[0050] Furthermore, when the moving block 607 moves downward, it can drive the first triangular block 902 and the second triangular block 903 to move downward, so that the second push pin 904 slides on the side walls of the first triangular block 902 and the second triangular block 903 in sequence, thereby pushing the slider 602 to slide back and forth along the fan-shaped groove 601. In addition, the fourth spring 1004 deforms, and the second sleeve 1002 and the second sleeve rod 1005 rotate adaptively. When the slider 602 slides back and forth, it drives the second rotating rod 603 and the fixed ring 605 to move back and forth, which can increase the range of the ball 606's knocking vibration, making the cleaning efficiency of impurities higher and the effect better.

Claims

1. A constant-diameter variable-pitch multistage Roots vacuum pump, comprising a pump body (101) and a motor (102), wherein the pump body (101) includes an inlet pipe (103) and an outlet pipe (104), and a first rotating shaft (105) and a second rotating shaft (107) are rotatably connected inside the pump body (101), and rotors (106) are fixedly connected to the side walls of both the first rotating shaft (105) and the second rotating shaft (107), characterized in that: A cooling tank (11) is fixedly connected to the side wall of the pump body (101), and a liquid supply pipe (14) and a liquid return pipe (19) are fixedly connected to the side wall of the cooling tank (11). A first circular hole (12) is opened at the end of the first rotating shaft (105), and a second circular hole (13) is opened at the end of the second rotating shaft (107). A first annular cover (15) is fixedly fitted on the side wall of the first rotating shaft (105), and the first annular cover (15) communicates with the first circular hole (12) through a through hole (16). 15) A rotating ring (17) is rotatably connected inside, and the other end of the liquid supply pipe (14) is fixedly inserted into the side wall of the rotating ring (17). A first connecting pipe (18) is inserted into one end of the second round hole (13), and the first connecting pipe (18) is fixed to the liquid supply pipe (14). A second connecting pipe (20) is inserted into the ends of the first round hole (12) and the second round hole (13), and the second connecting pipe (20) is fixed to the return pipe (19). The inlet of the air inlet pipe (103) is provided with a filter mechanism for filtering the gas.

2. The constant diameter variable pitch multistage Roots vacuum pump according to claim 1, characterized in that: The filtration mechanism includes a bracket (201) fixedly connected to the side wall of the motor (102), and a second annular cover (202) fixedly connected to the top of the bracket (201). A rotating disk (204) is rotatably connected to the top of the second annular cover (202), and an exhaust pipe (203) is fixedly connected to the side wall of the second annular cover (202). The inlet of the exhaust pipe (103) is fixed to the bottom of the second annular cover (202), and an installation disk (205) is fixedly connected to the bottom of the rotating disk (204). A filter screen (206) arranged in annular shape is fixedly connected to the bottom of the installation disk (205), and multiple arrayed baffles (207) are fixedly connected to the side wall of the filter screen (206). A cleaning mechanism for cleaning and collecting impurities on the surface of the filter screen (206) is provided on the second annular cover (202), and a vibration mechanism for tapping and vibrating the inner wall of the filter screen (206) is provided inside the second annular cover (202).

3. The constant diameter variable pitch multistage Roots vacuum pump according to claim 2, characterized in that: The cleaning mechanism includes a sliding plate (401) slidably connected between two adjacent baffles (207), and the sliding plate (401) is connected to the top of the rotating disk (204) through a lifting mechanism. The bottom of the sliding plate (401) is fixedly connected to two symmetrically arranged first springs (402). The lower end of the first spring (402) is fixedly connected to a scraper (403), and the top of the scraper (403) is provided with an insertion hole (404). The bottom of the sliding plate (401) is fixedly connected to a first push rod (405), and the bottom of the second annular cover (202) is fixedly inserted with a conical cover (406). The bottom of the conical cover (406) is fixedly connected to a collection box (407), and the top of the conical cover (406) is rotatably connected to a rotating plate (408) through a torque shaft.

4. The constant diameter variable pitch multistage Roots vacuum pump according to claim 3, characterized in that: The lifting mechanism includes two symmetrically arranged movable rods (501) fixedly connected to the top of each sliding plate (401), and a stop block (502) fixedly connected to the upper end of each movable rod (501). A second spring (503) is sleeved on the side wall of each movable rod (501), and a second push rod (504) is fixedly connected to the side wall of the stop block (502). A mounting bracket (505) is fixedly connected to the top of the bracket (201), and a push block (506) is fixedly connected to the top of the mounting bracket (505). The side wall of the push block (506) is provided with an inclined surface (507).

5. The constant diameter variable pitch multistage Roots vacuum pump according to claim 4, characterized in that: The vibration mechanism includes a fan-shaped groove (601) on the top of the rotating disk (204), and the fan-shaped groove (601) is provided through the bottom of the mounting disk (205). A slider (602) is slidably connected in the fan-shaped groove (601), and a telescopic cover (604) is fixedly connected between the slider (602) and the fan-shaped groove (601). A moving block (607) is connected to the side wall of the stop block (502) through a reset mechanism, and a second rotating rod (603) is rotatably connected to the bottom of the moving block (607). The second rotating rod (603) is provided through the top of the slider (602), and a fixing ring (605) is fixedly sleeved on the side wall of the second rotating rod (603). A ball (606) is connected to the side wall of the fixing ring (605) through a telescopic mechanism. The rotation of the second rotating rod (603) is driven by a driving mechanism, and the sliding of the slider (602) is pushed by a pushing mechanism.

6. The constant diameter variable pitch multistage Roots vacuum pump according to claim 5, characterized in that: The telescopic mechanism includes a first sleeve (701) fixedly connected to the side wall of the fixed ring (605), and a first sliding disc (702) slidably connected inside the first sleeve (701). A first sleeve rod (703) is fixedly connected to the end of the first sliding disc (702). The other end of the first sleeve rod (703) is fixed to the side wall of the ball (606), and a third spring (704) is sleeved on the side wall of each first sleeve rod (703).

7. The constant diameter variable pitch multistage Roots vacuum pump according to claim 5, characterized in that: The drive mechanism includes a spiral groove (801) formed on the side wall of the second rotating rod (603), and a support block (802) is fixedly connected to the top of the rotating disk (204). A first push pin (803) is fixedly connected to the side wall of the support block (802), and the first push pin (803) is inserted into the spiral groove (801).

8. The constant diameter variable pitch multistage Roots vacuum pump according to claim 5, characterized in that: The pushing mechanism includes a mounting plate (905) fixedly connected to the bottom of the moving block (607). The side wall of the mounting plate (905) is fixedly connected to a plurality of arrayed first triangular blocks (902) and a plurality of arrayed second triangular blocks (903). The top of the rotating disk (204) is fixedly connected to a fixing plate (901), and the side wall of the fixing plate (901) is fixedly connected to a second pushing pin (904).

9. The constant diameter variable pitch multistage Roots vacuum pump according to claim 5, characterized in that: The reset mechanism includes a first connecting block (1001) fixedly connected to the side wall of the stop block (502), and a second sleeve (1002) rotatably connected to the side wall of the first connecting block (1001). A second sliding disc (1003) is slidably connected inside the second sleeve (1002), and a second sleeve rod (1005) is fixedly connected to the end of the second sliding disc (1003). The other end of the second sleeve rod (1005) is rotatably connected to the side wall of the moving block (607), and a fourth spring (1004) is fixedly connected between the second sliding disc (1003) and the second sleeve (1002).

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