A screw vacuum pump

Abstract

The present invention provides a screw vacuum pump, comprising a pump body and a driving motor, wherein two screws are arranged in the pump body, an air inlet and an air outlet are respectively arranged on both sides of the pump body, a heat dissipation cavity is also arranged in the pump body, a coolant is arranged in the heat dissipation cavity, a plurality of cooling pipes are arranged at the bottom of the air outlet, both ends of the cooling pipes are connected with the heat dissipation cavity, a refrigerator is arranged at the bottom of the pump body, a power rod is arranged at the side of the screw away from the driving motor, the power rod extends into the heat dissipation cavity, a plurality of fan blades are fixedly arranged on the power rod, when the power rod rotates, the coolant circulates in the heat dissipation cavity, the heat dissipation of the gas in the cavity is realized by filling the heat dissipation cavity with coolant and arranging a cooling pipe at the bottom of the air outlet, the fan blades are driven to rotate by the rotation of the screw, so that the coolant is in a flowing state, the heat dissipation efficiency is further increased, the air pump is suitable for the extraction or introduction of some flammable and explosive gases, and the application scope is increased.

Description

Technical Field

[0001] The invention relates to an air pump, in particular to a screw vacuum pump. Background Art

[0002] At present, a Chinese patent with announcement number CN112228340A discloses an oil-free screw vacuum pump, including a power motor and a pump body. An air inlet pipe and an exhaust pipe are opened on the top of the pump body. An accelerating impeller is arranged inside the air inlet pipe to increase the air intake speed by accelerating the rotation of the impeller. An annular sleeve is arranged on the outside of the pump body, and a plurality of cooling fins are arranged on the inner wall of the annular sleeve. An air flow channel is formed between the cooling fins to achieve the purpose of heat dissipation.

[0003] The above patent still has shortcomings. Only the heat dissipation fins can dissipate heat for the pump body, and the heat dissipation efficiency for the gas inside the pump body is poor, so that the air pump cannot extract or draw in flammable and explosive gases. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a screw vacuum pump having the function of lowering the gas temperature inside the pump body.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a screw vacuum pump, comprising a pump body and a driving motor, a cavity is opened in the pump body, two screws that cooperate with each other are arranged in the cavity, one side of the screw is fixedly arranged at the output end of the driving motor, and the pump body is respectively provided with an air inlet and an air outlet on both sides of the screw, a heat dissipation cavity is also arranged in the pump body, and a coolant is arranged in the heat dissipation cavity, a plurality of cooling pipes are arranged at the bottom of the air outlet, both ends of the cooling pipes are connected with the heat dissipation cavity, a refrigerator is arranged at the bottom of the pump body, a power rod is arranged on the side of the screw away from the driving motor, the power rod extends into the heat dissipation cavity, a plurality of fan blades are fixedly arranged on the power rod, and the coolant circulates in the heat dissipation cavity when the power rod rotates.

[0006] Through the above-mentioned technical means, a heat dissipation cavity is opened and filled with coolant, and a cooling pipe is arranged at the bottom of the air outlet to achieve heat dissipation of the gas inside the cavity. The fan blades are driven to rotate by the rotation of the screw to make the coolant flow, and the coolant is cooled by the refrigerator to further increase its heat dissipation efficiency, so that the air pump is suitable for the extraction or introduction of some flammable and explosive gases, thereby increasing its scope of application.

[0007] Preferably, gears are provided on both screws, and the gears are meshed with each other. An oil chamber is also provided in the pump body, and the gears are provided in the oil chamber. Lubricating oil is provided at the bottom of the oil chamber, and a seal is provided between the screw and the side wall of the oil chamber.

[0008] Through the above technical means, the bottom of the gear is immersed in lubricating oil to reduce the friction loss of the gear, and the gear is cooled to a certain extent. A seal is set between the screw and the side wall of the oil chamber to prevent oil leakage when the screw rotates.

[0009] Preferably, a seal is provided between the power rod and the side wall of the heat dissipation cavity, the seal comprises a sealing bone ring and a bearing, a ring groove is provided at a side end of the sealing bone ring, and a pressure elastic ring is provided in the ring groove.

[0010] Through the above technical means, the power rod and the side wall of the heat dissipation cavity are kept sealed by the bearing and the sealing bone ring while reducing the friction, and the sealing effect is increased by arranging a pressure elastic ring inside the sealing fixture.

[0011] Preferably, a float groove is further provided in the oil chamber, and a float sensor is slidably provided in the float groove. When the lubricating oil level in the oil chamber is low, the float sensor controls the motor to stop rotating.

[0012] Through the above technical means, a float groove is set in the oil chamber, and the float block sensor slides up and down in the float groove, so as to monitor the oil level in the oil chamber and prevent the air pump from continuing to run when the oil level is too low, causing excessive wear of the gears.

[0013] Preferably, a filter assembly is also provided at the bottom of the air inlet, and the filter assembly includes an outer shell and a plurality of filter screens, and the filter screens are detachably connected to the outer shell, and the filter screens have meshes of different sizes. A locking piece is also provided on the outer shell, and the locking piece is used to lock the filter screen.

[0014] Through the above technical means, by detachably setting a plurality of filters in the shell, and by opening meshes of different sizes on the filters, and by observing the accumulation of dust on the filters, the air pump can select the most suitable filter, thereby increasing the suction efficiency.

[0015] Preferably, the side ends of the shell are provided with a plurality of mesh grooves, the side ends of the mesh grooves are all provided with top grooves, the filter net is arranged in the mesh grooves, the locking member comprises a top ring, the top ring is arranged in the top groove, a spring sheet is fixedly provided at the bottom of the top ring, and the spring sheet drives the top ring to press against the filter net.

[0016] Through the above technical means, the top ring is pressed against the spring sheet, and the top ring is pressed against the filter screen, so that the filter screen is fixed by friction, and the removal of the filter screen is convenient, and the filter screen is replaced more conveniently.

[0017] Preferably, a frame is provided on the outside of the filter screen, and a micro suction cup is provided on the upper end of the screen slot. The upper end of the micro suction cup is connected to an air suction hole 1, and an air suction hole 2 is also provided in the outer shell. The air suction hole 1 is communicated with the air suction hole 2. When the air pump is started, the micro suction cup sucks the frame tightly.

[0018] Through the above technical means, when the air pump is started, a certain suction force will be generated in the outer shell, which will tighten the frame so that the filter screen will not be separated from the screen slot due to vibration during the operation of the air pump, thereby increasing the stability of the air pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of embodiment 1;

[0020] Figure 2 for Figure 1 Schematic diagram of part A;

[0021] Figure 3 It is a structural schematic diagram of Embodiment 2;

[0022] Figure 4 is a schematic diagram of the structure of the filter component;

[0023] Figure 5 for Figure 4 A magnified view of part B;

[0024] Figure 6 A schematic cross-sectional view of the housing.

[0025] Figure numerals: 1. pump body; 2. drive motor; 3. cavity; 4. screw; 5. air inlet; 6. air outlet; 7. heat dissipation cavity; 8. cooling pipe; 9. refrigerator; 10. power rod; 11. fan blade; 12. filling port; 13. gear; 14. oil cavity; 15. seal; 16. sealing bone ring; 17. bearing; 18. ring groove; 19. pressure elastic ring; 20. float groove; 21. float block sensor; 22. filter assembly; 23. outer shell; 24. filter net; 25. mesh groove; 26. locking piece; 27. top groove; 28. top ring; 29. ​​shrapnel; 30. micro suction cup; 31. suction hole one; 32. suction hole two. DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp. Embodiment 1:

[0027] A screw 4 type vacuum pump comprises a pump body 1 and a drive motor 2, wherein the drive motor 2 is arranged at one side of the pump body 1, a cavity 3 is provided in the pump body 1, two screws 4 cooperating with each other are provided in the cavity 3, the output shaft of the drive motor 2 passes through the housing 23 of the pump body 1 and extends into the cavity 3, one side of the screw 4 is fixedly provided on the output shaft of the drive motor 2, the pump body 1 is provided with an air inlet 5 and an air outlet 6 on both sides of the screw 4, the air inlet 5 is provided at the bottom of the pump body 1, the air outlet 6 is provided at the top of the pump body 1, a heat dissipation cavity 7 is further provided in the pump body 1, the heat dissipation cavity 7 is provided at one side of the cavity 3, a coolant is provided in the heat dissipation cavity 7, a plurality of cooling pipes 8 are provided at the bottom of the air outlet 6, and the cooling pipes 8 One end is connected to the left side of the heat dissipation cavity 7, and the other end is connected to the right side of the heat dissipation cavity 7. A refrigerator 9 is arranged at the bottom of the pump body 1, and a refrigeration pipe is arranged at the upper end of the refrigerator 9. The refrigeration tank extends into the heat dissipation cavity 7. A power rod 10 is arranged on the side of the screw 4 away from the driving motor 2. The power rod 10 extends into the heat dissipation cavity 7. A plurality of fan blades 11 are fixedly arranged on the power rod 10. When the power rod 10 rotates, the coolant circulates in the heat dissipation cavity 7. A filling port 12 is also arranged at the upper end of the heat dissipation cavity 7 to replenish the coolant. When the driving motor 2 drives the screw 4 to rotate, the power rod 10 rotates simultaneously with the screw 4 and rotates with the fan blades 11, so that the coolant continuously passes through the cooling pipe 8, thereby achieving the purpose of gas heat dissipation.

[0028] Gears 13 are provided at one end of the two screw rods 4 close to the driving motor 2, and the gears 13 are meshed with each other. An oil chamber 14 is also provided in the pump body 1, and the oil chamber 14 is provided on the side away from the heat dissipation chamber 7. The gear 13 is provided in the oil chamber 14, and lubricating oil is provided in the oil chamber 14. One quarter of the gear 13 is immersed in the lubricating oil. When the gear 13 rotates, the viscosity of the lubricating oil will keep the meshing part of the gear 13 lubricated, thereby increasing the service life of the gear 13. A seal 15 is provided between the screw rod 4 and the side wall of the oil chamber 14, and a seal 15 is also provided between the power rod 10 and the side wall of the heat dissipation chamber 7. The seal 15 includes a sealing bone ring 16 and a bearing 17. An annular groove 18 is provided on the side end of the sealing bone ring 16, and a pressure elastic ring 19 is provided in the annular groove 18. A self-lubricating coating is provided on the contact surface between the sealing bone ring 16 and the shaft to reduce the friction between the sealing bone ring 16 and the shaft. The pressure elastic ring 19 includes a ring spring connected to the end.

[0029] A float groove 20 is also provided in the oil chamber 14, and a float sensor 21 is slidably provided in the float groove 20. When the lubricating oil level in the oil chamber 14 is low, the float sensor 21 controls the motor to stop rotating. By providing the float groove 20 in the oil chamber 14 and making the float sensor 21 slide up and down in the float groove 20, the oil level in the oil chamber 14 is monitored to prevent the air pump from continuing to run when the oil level is too low, which causes excessive wear of the gear 13. Embodiment 2:

[0030] The difference between the second embodiment and the first embodiment is that a filter assembly 22 is further provided at the bottom of the air inlet 5. The filter assembly 22 includes an outer shell 23 and a plurality of filter screens 24. The filter screens 24 are detachably connected to the outer shell 23. The outer shell 23 is a square outer shell 23. Four mesh slots 25 are provided at the side end. The filter screens 24 can be inserted into the mesh slots 25 to achieve filtering. The filter screens 24 have meshes of different sizes. By observing the dust accumulation type of the filter screen 24 or selecting a suitable filter screen 24 through experimental data, the influence of the filter screen 24 on the air intake speed is reduced to a minimum. A locking piece 26 is also provided on the outer shell 23. The locking piece 26 is used to lock the filter screen 24.

[0031] The side ends of the mesh slots 25 are provided with top slots 27, the filter screen 24 is arranged in the mesh slots 25, the locking member 26 includes a top ring 28, the top ring 28 is square and arranged in the top slot 27, the inner and outer sides of the top ring 28 are provided with inclined surfaces to facilitate the insertion of the filter screen 24, a spring piece 29 is fixedly provided at the bottom of the top ring 28, the spring piece 29 drives the top ring 28 to press against the filter screen 24, and a frame is provided on the outer side of the filter screen 24, and a micro suction cup 30 is provided at the upper end of the mesh slots 25, and an air suction hole 3 is connected to the upper end of the micro suction cup 30 1. A second suction hole 32 is also provided in the housing 23. The first suction hole 31 is communicated with the second suction hole 32. When the filter 24 is pulled out, the spring piece 29 lifts the top ring 28 and makes the top of the top ring 28 abut against the micro suction cup 30, thereby preventing other filter nets 24 from being unable to be sucked tightly when one filter net 24 is pulled out. When the air pump is started, a certain suction force will be generated in the housing 23, and the frame will be sucked tightly by the suction force, so that the filter net 24 will not be separated from the net slot 25 due to vibration during the operation of the air pump, thereby increasing the stability of the air pump.

[0032] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A screw vacuum pump, comprising a pump body (1) and a drive motor (2), wherein a cavity (3) is provided in the pump body (1), two screws (4) cooperating with each other are arranged in the cavity (3), one side of the screw (4) is fixedly arranged at the output end of the drive motor (2), and the pump body (1) is respectively provided with an air inlet (5) and an air outlet (6) on both sides of the screw (4), wherein: The pump body (1) is also provided with a heat dissipation cavity (7), wherein a coolant is provided in the heat dissipation cavity (7), a plurality of cooling pipes (8) are provided at the bottom of the air outlet (6), both ends of the cooling pipes (8) are connected to the heat dissipation cavity (7), a refrigerator (9) is provided at the bottom of the pump body (1), a power rod (10) is provided on the side of the screw rod (4) away from the drive motor (2), the power rod (10) extends into the heat dissipation cavity (7), a plurality of fan blades (11) are fixedly provided on the power rod (10), and when the power rod (10) rotates, the coolant circulates in the heat dissipation cavity (7); Gears (13) are provided on both screw rods (4), and the gears (13) are meshed with each other. An oil chamber (14) is also provided in the pump body (1), and the gears (13) are provided in the oil chamber (14). Lubricating oil is provided at the bottom of the oil chamber (14), and a sealing member (15) is provided between the screw rod (4) and the side wall of the oil chamber (14); A sealing member (15) is provided between the power rod (10) and the side wall of the heat dissipation cavity (7), the sealing member (15) comprising a sealing bone ring (16) and a bearing (17), a ring groove (18) is provided at the side end of the sealing bone ring (16), and a pressure elastic ring (19) is provided in the ring groove (18); A float groove (20) is also provided in the oil chamber (14), and a float sensor (21) is slidably provided in the float groove (20). When the lubricating oil level in the oil chamber (14) is low, the float sensor (21) controls the driving motor (2) to stop rotating. A filter assembly (22) is also provided at the bottom of the air inlet (5), the filter assembly (22) comprising a housing (23) and a plurality of filter screens (24), the filter screens (24) being detachably connected to the housing (23), the filter screens (24) having meshes of different sizes, and a locking member (26) is also provided on the housing (23), the locking member (26) being used to lock the filter screens (24); The side end of the housing (23) is provided with a plurality of mesh slots (25), and the side ends of the mesh slots (25) are all provided with top slots (27). The filter net (24) is arranged in the mesh slots (25). The locking member (26) comprises a top ring (28), and the top ring (28) is arranged in the top slot (27). A spring sheet (29) is fixedly provided at the bottom of the top ring (28), and the spring sheet (29) drives the top ring (28) to press against the filter net (24); The filter screen (24) is provided with a frame on the outside, and the upper end of each mesh slot (25) is provided with a micro suction cup (30), and the upper end of each micro suction cup (30) is connected to a first suction hole (31). A second suction hole (32) is also provided in the housing (23), and the first suction hole (31) is communicated with the second suction hole (32).

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