Noise reduction type double-screw vacuum pump

Abstract

The invention belongs to the technical field of double-screw vacuum pumps, and particularly relates to a noise reduction type double-screw vacuum pump which comprises a base, a motor is fixedly connected to one side of the top of the base, a pump shell is fixedly connected to the other side of the top of the base, and a front cover is fixedly connected to the side, close to the motor, of the pump shell. The side, away from the motor, of the pump shell is fixedly connected with a rear cover, the output end of the motor is in transmission connection with a transmission shaft, the end, away from the motor, of the transmission shaft is in transmission connection with a driving gear, and the end, away from the motor, of the driving gear is in transmission connection with a driving screw. The gravity center of the rotor of the motor coincides with the gravity center of the rotating shaft through the balancing weight, the dynamic balance effect is achieved, vibration and noise generated in the high-speed operation process of the motor are reduced, the service life of equipment is prolonged, and the operation efficiency of the equipment is improved; and the device adapts to different rotating speeds of the motor and has wide application value.

Description

Technical Field

[0001] This invention relates to the field of twin-screw vacuum pump technology, and more particularly to a noise-reducing twin-screw vacuum pump. Background Technology

[0002] A screw vacuum pump is a pumping device that uses a pair of screws to rotate synchronously at high speed in opposite directions within the pump casing to generate suction and exhaust. It is a replacement product for oil-sealed vacuum pumps and can pump gases containing large amounts of water vapor and small amounts of dust. It is widely used in domestic pharmaceutical, chemical, and semiconductor industries, which have high requirements for clean vacuum.

[0003] A search revealed Chinese patent application CN117145728A, which discloses a silencer and an electric vacuum pump. The silencer includes alternating stacked first and second silencers. The first silencer has a dispersed first flow channel, and the second silencer has a converged second flow channel. The noise level is reduced through a three-dimensional labyrinthine silencer path. When assembled into an electric vacuum pump, it improves the NVH (noise, vibration, and harshness) of the electric vacuum pump.

[0004] When a vacuum pump motor drives a gear set, it generates vibration, which is one of the main sources of noise generated by the vacuum pump. The aforementioned devices cannot effectively suppress the noise generated by motor vibration, and their noise reduction capabilities are limited. There is an urgent need to design a noise-reducing twin-screw vacuum pump to solve the above problems. Summary of the Invention

[0005] Based on the technical problem that existing vacuum pumps cannot effectively suppress the noise generated by motor vibration and have limited noise reduction capabilities, this invention proposes a noise-reducing twin-screw vacuum pump.

[0006] This invention proposes a noise-reducing twin-screw vacuum pump, comprising a base, a motor fixedly connected to one side of the top of the base, and a pump housing fixedly connected to the other side of the top of the base. A front cover is fixedly connected to the side of the pump housing closest to the motor, and a rear cover is fixedly connected to the side of the pump housing furthest from the motor. A drive shaft is driven through the output end of the motor, and a drive gear is driven through the end of the drive shaft furthest from the motor. A drive screw is driven through the end of the drive gear furthest from the motor, and the drive screw is rotatably connected to the inner wall of the rear cover. A balance chamber is fixedly connected to the outer wall of the rear cover. A cover plate is fixedly connected to the side of the balance chamber away from the rear cover. A transmission block is driven to the end of the drive screw away from the motor. The transmission block is located inside the balance chamber. A threaded column is threaded to the middle of the transmission block. A counterweight is fixedly connected to one end of the threaded column. An adjustment knob is fixedly connected to the other end of the threaded column. A driven screw is rotatably connected to the inner wall of the rear cover. A driven gear is driven to the end of the driven screw away from the rear cover. The drive gear meshes with the driven gear. An air inlet pipe is fixedly connected to the side of the pump housing near the motor. An exhaust pipe is fixedly connected to the side of the pump housing away from the motor.

[0007] Preferably, a motor fixing slot is provided on the top of the base near the motor, and a motor bracket is fixedly connected inside the motor fixing slot, with the motor fixedly connected inside the motor bracket.

[0008] Preferably, the outer wall of the pump casing near the motor is fixedly connected with uniformly distributed heat dissipation fins.

[0009] Preferably, a sealing partition is fixedly connected to the inner wall of the pump casing, and the space on the side of the sealing partition inside the pump casing closer to the motor is set as a gear compartment, while the space on the side of the sealing partition inside the pump casing away from the motor is set as a screw compartment.

[0010] Preferably, both the driving gear and the driven gear are rotatably connected inside the gearbox.

[0011] Preferably, both the driving screw and the driven screw are rotatably connected inside the screw magazine.

[0012] Preferably, one end of the intake pipe is connected to the end of the screw compartment near the motor, and the other end of the intake pipe is fixedly connected to an intake connector. One end of the exhaust pipe is connected to the end of the screw compartment away from the motor, and the other end of the exhaust pipe is fixedly connected to an exhaust connector. Both the exhaust connector and the intake connector are located outside the pump housing.

[0013] Preferably, the top of the base is provided with a suspension groove, and a hoisting platform is provided inside the suspension groove. The pump casing is fixedly connected to the top of the hoisting platform. Lower connectors are fixedly connected to the four corners of the hoisting platform. A frame is fixedly connected to the top of the base. Upper connectors are fixedly connected to the four corners of the top of the frame. Hanging chains are fixedly connected to the bottom of the four upper connectors. The bottom ends of the four hanging chains are respectively fixedly connected to the top of the four lower connectors.

[0014] Preferably, a vibration damping plate is bonded to the bottom of the hoisting platform. The vibration damping plate is made of rubber, and the bottom of the vibration damping plate is in contact with the inner wall of the bottom of the suspension groove. The bottom of the vibration damping plate is provided with evenly distributed vibration damping grooves.

[0015] Preferably, both sides of the base are fixedly connected with connecting rods, and both sides of the base are fixedly connected with sliding grooves via connecting rods. The tops of the two sliding grooves are slidably connected to the same outer shell. The inner wall of the outer shell is fixedly connected with sound insulation cotton. An air inlet is opened on the side of the outer shell near the air inlet connector, and an exhaust outlet is opened on the side of the outer shell near the exhaust connector. The body of the sound insulation cotton has through holes adapted to the air inlet and the exhaust outlet. A handle is fixedly connected to the outer wall of the top of the outer shell.

[0016] Compared with the prior art, the present invention provides a noise-reducing twin-screw vacuum pump, which has the following beneficial effects: 1. This noise-reducing twin-screw vacuum pump, by setting a counterweight, adjusting knob, and threaded column, achieves dynamic balance by aligning the rotor center of gravity of the motor with the center of gravity of the overall shaft of the device through the counterweight connected by transmission, thereby reducing vibration and noise generated during high-speed operation of the motor, extending the service life of the equipment, and improving the operating efficiency of the equipment. The center of gravity of the shaft can be adjusted by rotating the threaded column through the adjusting knob to adapt to different speeds of the motor, and has wide applicability.

[0017] 2. This noise-reducing twin-screw vacuum pump, by setting up a frame, lifting chain, lifting platform, vibration damping plate and vibration damping groove, suspends the lifting platform inside the suspension groove through the lifting chain and frame, so that the lifting platform has the ability to support the pump casing while also having the ability to sway within the diameter range of the suspension groove. The vibration damping plate is supported at the bottom of the lifting platform. When the equipment is running, the vibration of the pump casing is transmitted downward through the lifting platform, and the vibration damping plate dampens the vibration through its own deformation. The vibration damping groove at the bottom of the vibration damping plate increases the deformation and recovery ability of the vibration damping plate, thus enhancing the vibration reduction and noise reduction function of the equipment.

[0018] 3. This noise-reducing twin-screw vacuum pump, by setting up a shell, sound insulation cotton and a slide groove, the shell and sound insulation cotton cover the outside of the motor and pump housing, forming further sound insulation. By pulling the shell with a handle, its bottom can be slid along the slide groove, and the shell can be removed to facilitate maintenance of internal components. The air inlet and exhaust port are used for external pipes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a noise-reducing twin-screw vacuum pump proposed in this invention; Figure 2 This is a right-side structural schematic diagram of a noise-reducing twin-screw vacuum pump proposed in this invention; Figure 3 This is a schematic diagram of the base and frame structure of a noise-reducing twin-screw vacuum pump proposed in this invention; Figure 4 This is a schematic diagram of the structure at point A of a noise-reducing twin-screw vacuum pump proposed in this invention; Figure 5 This is a top view of the pump casing structure of a noise-reducing twin-screw vacuum pump proposed in this invention; Figure 6 This is a schematic diagram of the base structure of a noise-reducing twin-screw vacuum pump proposed in this invention; Figure 7 This is a schematic diagram of the pump casing structure of a noise-reducing twin-screw vacuum pump proposed in this invention; Figure 8 This is a schematic cross-sectional view of the pump casing of a noise-reducing twin-screw vacuum pump proposed in this invention. Figure 9 This is a schematic diagram of the internal structure of the balance chamber of a noise-reducing twin-screw vacuum pump proposed in this invention.

[0020] In the diagram: 1. Base; 2. Connecting rod; 3. Slide groove; 4. Outer shell; 5. Sound insulation cotton; 6. Handle; 7. Air inlet; 8. Exhaust outlet; 9. Frame; 10. Rear cover; 11. Cover plate; 12. Lower connector; 13. Upper connector; 14. Lifting chain; 15. Pump housing; 16. Exhaust connector; 17. Air inlet connector; 18. Balance chamber; 19. Heat dissipation fins; 20. Lifting platform; 21. Vibration damping plate; 22. 23. Suspension groove; 24. Vibration damping groove; 25. Front cover; 26. Motor; 27. Motor bracket; 28. Motor mounting groove; 29. ​​Gear compartment; 20. Screw compartment; 31. Driven gear; 32. Exhaust pipe; 33. Intake pipe; 34. Driven screw; 35. Driven screw; 36. Sealing partition; 37. Transmission block; 38. Threaded column; 39. Adjustment knob; 40. Counterweight block. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Reference Figure 1-9 A noise-reducing twin-screw vacuum pump includes a base 1. A motor 25 is fixedly connected to one side of the top of the base 1, and a pump housing 15 is fixedly connected to the other side of the top of the base 1. A front cover 24 is fixedly connected to the side of the pump housing 15 closest to the motor 25, and a rear cover 10 is fixedly connected to the side of the pump housing 15 furthest from the motor 25. A drive shaft is driven through the output end of the motor 25, and a drive gear 34 is driven through the end of the drive shaft furthest from the motor 25. The drive gear 34 is driven through the end furthest from the motor 25. A drive screw 35 is connected to the inner wall of the rear cover 10. A balance chamber 18 is fixedly connected to the outer wall of the rear cover 10. A cover plate 11 is fixedly connected to the side of the balance chamber 18 away from the rear cover 10. A transmission block 37 is driven to the end of the drive screw 35 away from the motor 25. The transmission block 37 is located inside the balance chamber 18. A threaded post 38 is threaded to the middle of the transmission block 37. A counterweight 40 is fixedly connected to one end of the threaded post 38, and an adjustment knob 3 is fixedly connected to the other end of the threaded post 38. 9. A driven screw 33 is rotatably connected to the inner wall of the rear cover 10. A driven gear 30 is driven to the end of the driven screw 33 away from the rear cover 10. The driving gear 34 meshes with the driven gear 30. An air inlet pipe 32 is fixedly connected to the side of the pump housing 15 near the motor 25, and an exhaust pipe 31 is fixedly connected to the side of the pump housing 15 away from the motor 25. The motor 25 drives the driving gear 34 and the driving screw 35 to rotate. The driving gear 34 drives the driven gear 30 and the driven screw 33 to rotate synchronously. The rotation of the driven gear 35 and the driven gear 30 drives the airflow, drawing air in through the intake pipe 32 and then expelling it through the exhaust pipe 31. When the motor 25 drives the internal components of the pump casing 15 to rotate, vibration is generated. The counterweight block 40 connected by the transmission realizes that the center of gravity of the rotor of the motor 25 coincides with the center of gravity of the overall rotating shaft of the device, achieving a dynamic balance effect and reducing the vibration and noise generated by the high-speed operation of the motor 25. By rotating the threaded column 38 through the adjustment knob 39, the center of gravity of the rotating shaft can be adjusted to adapt to different speeds of the motor 25.

[0023] In this invention, a motor fixing groove 27 is provided on the top side of the base 1 near the motor 25. A motor bracket 26 is fixedly connected inside the motor fixing groove 27. The motor 25 is fixedly connected inside the motor bracket 26. The motor 25 is fixed above the base 1 by the motor fixing groove 27 and the motor bracket 26.

[0024] In this invention, the outer wall of the pump housing 15 near the motor 25 is fixedly connected with uniformly distributed heat dissipation fins 19, which accelerate the heat exchange efficiency between the internal components of the pump housing 15 and the outside world.

[0025] In this invention, a sealing partition 36 is fixedly connected to the inner wall of the pump housing 15. The space on the side of the sealing partition 36 inside the pump housing 15 closest to the motor 25 is set as a gear compartment 28, and the space on the side of the sealing partition 36 inside the pump housing 15 away from the motor 25 is set as a screw compartment 29. The sealing partition 36 divides the functional areas inside the pump housing 15.

[0026] In this invention, both the driving gear 34 and the driven gear 30 are rotatably connected inside the gear compartment 28.

[0027] In this invention, both the driving screw 35 and the driven screw 33 are rotatably connected inside the screw compartment 29.

[0028] In this invention, one end of the intake pipe 32 is connected to the end of the screw compartment 29 near the motor 25, and the other end of the intake pipe 32 is fixedly connected to the intake connector 17. One end of the exhaust pipe 31 is connected to the end of the screw compartment 29 away from the motor 25, and the other end of the exhaust pipe 31 is fixedly connected to the exhaust connector 16. Both the exhaust connector 16 and the intake connector 17 are located outside the pump housing 15. An external pipe is connected to the intake pipe 32 through the exhaust connector 16, and an external pipe is connected to the exhaust pipe 31 through the intake connector 17.

[0029] In this invention, a suspension groove 22 is provided on the top of the base 1, and a hoisting platform 20 is provided inside the suspension groove 22. The pump housing 15 is fixedly connected to the top of the hoisting platform 20. Lower connecting parts 12 are fixedly connected to the four corners of the hoisting platform 20. A frame 9 is fixedly connected to the top of the base 1. Upper connecting parts 13 are fixedly connected to the four corners of the top of the frame 9. Hanging chains 14 are fixedly connected to the bottom of the four upper connecting parts 13. The bottom ends of the four hanging chains 14 are respectively fixedly connected to the top of the four lower connecting parts 12. The hoisting platform 20 is suspended inside the suspension groove 22 by the hanging chains 14 and the frame 9, so that the hoisting platform 20 has the ability to support the pump housing 15 and also has the ability to swing within the diameter range of the suspension groove 22.

[0030] In this invention, a vibration damping plate 21 is bonded to the bottom of the hoisting platform 20. The vibration damping plate 21 is made of rubber. The bottom of the vibration damping plate 21 is in contact with the inner wall of the bottom of the suspension groove 22. The bottom of the vibration damping plate 21 is provided with uniformly distributed vibration damping grooves 23. The vibration damping plate 21 is supported on the bottom of the hoisting platform 20. When the equipment is running, the vibration of the pump casing 15 is transmitted downward through the hoisting platform 20. The vibration damping plate 21 damps the vibration through its own deformation. The vibration damping grooves 23 at the bottom of the vibration damping plate 21 increase the deformation and recovery ability of the vibration damping plate 21.

[0031] In this invention, connecting rods 2 are fixedly connected to both sides of the base 1, and sliding grooves 3 are fixedly connected to both sides of the base 1 via the connecting rods 2. The top of the two sliding grooves 3 are slidably connected to the same outer shell 4. Sound insulation cotton 5 is fixedly connected to the inner wall of the outer shell 4. An air inlet 7 is opened on the side of the outer shell 4 near the air inlet connector 17, and an exhaust outlet 8 is opened on the side of the outer shell 4 near the exhaust connector 16. The body of the sound insulation cotton 5 has through holes adapted to the air inlet 7 and the exhaust outlet 8. A handle 6 is fixedly connected to the outer wall of the top of the outer shell 4. The outer shell 4 and the sound insulation cotton 5 cover the outside of the motor 25 and the pump housing 15 to form further sound insulation. By pulling the outer shell 4 with the handle 6, the bottom of the outer shell 4 can be slid along the sliding groove 3, and the outer shell 4 can be removed in a limited manner.

[0032] In use, the outer casing 4 and sound insulation cotton 5 cover the exterior of the motor 25 and pump casing 15 to form sound insulation. An external pipe is connected to the intake pipe 32 via the exhaust connector 16, and to the exhaust pipe 31 via the intake connector 17. The intake port 7 and exhaust port 8 are used for the external pipes. A sealed partition 36 divides the internal functional areas of the pump casing 15. The driving gear 34 and driven gear 30 operate inside the gear compartment 28, and the driving screw 35 and driven screw 33 operate inside the screw compartment 29. The motor 25 drives the driving gear 34 and driving screw 35 to rotate, and the driving gear 34 drives the driven gear 30 and driven screw 33 to rotate synchronously. The rotation of the driving screw 35 and driven gear 30 drives airflow, drawing air in through the intake pipe 32 and expelling it through the exhaust pipe 31. The motor 25 vibrates the internal components of the pump casing 15 during operation, which is then transmitted through a transmission connection. The counterweight 40 ensures that the rotor center of gravity of the motor 25 coincides with the center of gravity of the overall shaft of the device, achieving dynamic balance, reducing vibration and noise generated during high-speed operation of the motor 25, extending the service life of the equipment, and improving the operating efficiency of the equipment. The center of gravity of the shaft can be adjusted by rotating the threaded column 38 through the adjustment knob 39 to adapt to different speeds of the motor 25. The hoisting platform 20 is suspended inside the suspension groove 22 by the hanging chain 14 and the frame 9, so that the hoisting platform 20 has the ability to support the pump casing 15 while also having the ability to sway within the diameter range of the suspension groove 22. The vibration damping plate 21 is supported at the bottom of the hoisting platform 20. When the equipment is running, the vibration of the pump casing 15 is transmitted downward through the hoisting platform 20, and the vibration damping plate 21 damps the vibration through its own deformation. The vibration damping groove 23 at the bottom of the vibration damping plate 21 increases the deformation and recovery deformation capabilities of the vibration damping plate 21, enhancing the vibration reduction and noise reduction function of the equipment.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A noise-reducing twin-screw vacuum pump, comprising a base (1), characterized in that, A motor (25) is fixedly connected to one side of the top of the base (1), and a pump housing (15) is fixedly connected to the other side of the top of the base (1). A front cover (24) is fixedly connected to the side of the pump housing (15) closest to the motor (25), and a rear cover (10) is fixedly connected to the side of the pump housing (15) furthest from the motor (25). A drive shaft is driven to the output end of the motor (25), and a drive gear (34) is driven to the end of the drive shaft furthest from the motor (25). A drive screw (35) is driven to the end of the drive gear (34) furthest from the motor (25). The drive screw (35) is rotatably connected to the inner wall of the rear cover (10). A balance chamber (18) is fixedly connected to the outer wall of the rear cover (10), and a cover plate (1) is fixedly connected to the side of the balance chamber (18) furthest from the rear cover (10). 1) The end of the active screw (35) away from the motor (25) is connected to a transmission block (37). The transmission block (37) is located inside the balance chamber (18). The middle part of the transmission block (37) is connected to a threaded column (38). One end of the threaded column (38) is fixedly connected to a counterweight block (40). The other end of the threaded column (38) is fixedly connected to an adjustment knob (39). The inner wall of the rear cover (10) is rotatably connected to a driven screw (33). The end of the driven screw (33) away from the rear cover (10) is connected to a driven gear (30). The active gear (34) meshes with the driven gear (30). The side of the pump housing (15) close to the motor (25) is fixedly connected to an air inlet pipe (32). The side of the pump housing (15) away from the motor (25) is fixedly connected to an exhaust pipe (31).

2. The noise-reducing twin-screw vacuum pump according to claim 1, characterized in that, The base (1) has a motor fixing slot (27) on the side of the top near the motor (25). A motor bracket (26) is fixedly connected inside the motor fixing slot (27), and the motor (25) is fixedly connected inside the motor bracket (26).

3. The noise-reducing twin-screw vacuum pump according to claim 1, characterized in that, The pump casing (15) has uniformly distributed heat dissipation fins (19) fixedly connected to the outer wall of the side near the motor (25).

4. The noise-reducing twin-screw vacuum pump according to claim 1, characterized in that, The inner wall of the pump casing (15) is fixedly connected with a sealing partition (36). The space on the side of the sealing partition (36) inside the pump casing (15) closer to the motor (25) is set as a gear compartment (28), and the space on the side of the sealing partition (36) inside the pump casing (15) away from the motor (25) is set as a screw compartment (29).

5. A noise-reducing twin-screw vacuum pump according to claim 4, characterized in that, Both the driving gear (34) and the driven gear (30) are rotatably connected inside the gearbox (28).

6. A noise-reducing twin-screw vacuum pump according to claim 4, characterized in that, Both the driving screw (35) and the driven screw (33) are rotatably connected to the inside of the screw magazine (29).

7. A noise-reducing twin-screw vacuum pump according to claim 4, characterized in that, One end of the intake pipe (32) is connected to the end of the screw compartment (29) near the motor (25), and the other end of the intake pipe (32) is fixedly connected to the intake connector (17). One end of the exhaust pipe (31) is connected to the end of the screw compartment (29) away from the motor (25), and the other end of the exhaust pipe (31) is fixedly connected to the exhaust connector (16). The exhaust connector (16) and the intake connector (17) are both located outside the pump casing (15).

8. The noise-reducing twin-screw vacuum pump according to claim 1, characterized in that, The base (1) has a suspension groove (22) on its top. The suspension groove (22) has a hoisting platform (20) inside. The pump casing (15) is fixedly connected to the top of the hoisting platform (20). The four corners of the hoisting platform (20) are fixedly connected to the lower connectors (12). The top of the base (1) is fixedly connected to the frame (9). The four corners of the top of the frame (9) are fixedly connected to the upper connectors (13). The bottom of the four upper connectors (13) is fixedly connected to the hanging chains (14). The bottom ends of the four hanging chains (14) are respectively fixedly connected to the top of the four lower connectors (12).

9. A noise-reducing twin-screw vacuum pump according to claim 8, characterized in that, The bottom of the hoisting platform (20) is bonded with a damping plate (21). The damping plate (21) is made of rubber. The bottom of the damping plate (21) is in contact with the inner wall of the bottom of the suspension groove (22). The bottom of the damping plate (21) is provided with uniformly distributed damping grooves (23).

10. A noise-reducing twin-screw vacuum pump according to claim 7, characterized in that, Both sides of the base (1) are fixedly connected with connecting rods (2), and both sides of the base (1) are fixedly connected with sliding grooves (3) through connecting rods (2). The top of the two sliding grooves (3) are slidably connected with the same outer shell (4). The inner wall of the outer shell (4) is fixedly connected with sound insulation cotton (5). The outer shell (4) has an air inlet (7) on the side near the air inlet connector (17) and an exhaust port (8) on the side near the exhaust connector (16). The body of the sound insulation cotton (5) has a through hole adapted to the air inlet (7) and the exhaust port (8). The outer wall of the top of the outer shell (4) is fixedly connected with a handle (6).

Images