An air-cooled claw pump that is easy to repair and replace and a method of using the same

Abstract

The present invention relates to an air-cooled claw pump that is easy to repair and replace and a method for using the same, comprising a pump body, an end shell, an end cover, a support leg, a rotor shaft and a rotor, both ends of the pump body are open, end shells are respectively installed at both ends of the pump body, and end covers are installed on the outside of the end shells, support legs are provided on the bottom side of the end shells, two rotor shafts are rotatably installed inside the end shells, and two rotors are rotatably installed in the pump cavity of the pump body; the residence time of air in the pump cavity is reduced by graded exhaust, and the air compression heat is reduced; the cooling water circulation in the pump body is used to cool the air in the pump cavity, the outside of the rotor is cooled by cooling and reflux of the exhausted air, and the inside of the rotor and the rotor shaft is cooled by water circulation, so that when the pumping volume and pumping speed of the pump body are increased, the compression heat is avoided to be too large and the rotor is avoided from being stuck and damaged due to thermal expansion.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum pumps, and in particular to an air-cooled claw pump that is easy to repair and replace and a method for using the same. Background Art

[0002] With the development of society and the increasing demands for environmental protection and energy conservation, the demand for clean vacuum is growing. A non-media claw-type vacuum pump is pollution-free and emission-free for both the pumped medium and the container, providing a clean vacuum environment. An air-cooled claw pump is a variable-displacement dry vacuum pump with a claw-shaped rotor. A vacuum pump is a device or equipment that creates a vacuum by evacuating the container using mechanical, physical, chemical, or physicochemical methods.

[0003] The rotor and rotor shaft of the existing air-cooled claw pump are of an integrated structure. Therefore, when assembling and disassembling, the pump body, end shell and end cover need to be disassembled as a whole. When the air-cooled claw pump is working, the rotor is likely to be damaged. When the rotor is damaged and needs to be replaced, the air-cooled claw pump needs to be disassembled and replaced as a whole. At the same time, the rotor and rotor shaft need to be replaced as a whole. The disassembly and maintenance efficiency is low and the maintenance and replacement cost is high.

[0004] Due to the excessive compression heat and the thermal expansion of the rotor, the air-cooled claw pump has not yet had a large suction capacity product. That is, when the pumping speed is increased, too much heat is generated in the air-cooled claw pump, and it is difficult to dissipate heat in time, which causes the rotor to expand due to the increase in compression heat, resulting in the rotor being stuck and damaged. Summary of the Invention

[0005] The problem solved by the present invention is to provide an air-cooled claw pump that is easy to repair and replace and a method for using the same, which solves the problem that the rotor and rotor shaft in the existing air-cooled claw pump are of an integrated structure, so when assembling and disassembling, the pump body, end shell and end cover need to be disassembled as a whole. When the air-cooled claw pump is working, the rotor is likely to be damaged. When the rotor is damaged and needs to be replaced, the air-cooled claw pump needs to be disassembled and replaced as a whole, and the rotor and rotor shaft need to be replaced as a whole. The disassembly and maintenance efficiency is low, and the maintenance and replacement cost is high.

[0006] Due to the excessive compression heat and the thermal expansion of the rotor, the air-cooled claw pump has not yet had a large suction capacity product. That is, when the pumping speed is increased, too much heat is generated in the air-cooled claw pump, which is difficult to dissipate in time, causing the rotor to expand due to the increase in compression heat, resulting in the technical problem of rotor jamming and damage.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] An air-cooled claw pump that is easy to repair and replace, comprising a pump body, an end shell, an end cover, a support leg, a rotor shaft, and a rotor, wherein both ends of the pump body are open, end shells are respectively installed at both ends of the pump body, and end covers are installed on the outside of the end shells, support legs are provided on the bottom side of the end shells, two rotor shafts are rotatably installed inside the end shells, two rotors are rotatably installed in the pump cavity of the pump body, and the two ends of the rotors are respectively plug-connected to the rotor shafts of the end shells, an air inlet is provided on the top side of the pump body, an exhaust port is provided on the bottom side of the pump body, rib walls are horizontally provided on two opposite middle parts of the pump body, and a plurality of first heat dissipation grilles are provided on the rib walls at equal intervals;

[0009] The pump body is provided with a cooling mechanism for cooling the discharged air and a reflux mechanism for cooling and refluxing the air.

[0010] Preferably, the cooling mechanism includes a cooling water channel opened inside the rib wall, and both ends of the cooling water channel are respectively connected to the water inlet and the water outlet at both ends of the rib wall.

[0011] Preferably, the reflux mechanism comprises a cooling air inlet nozzle connected to the air inlet, and the cooling air inlet nozzle is connected to a first reflux pipe;

[0012] The reflux mechanism further includes a second reflux pipe communicated with the exhaust port, and the first reflux pipe and the second reflux pipe are respectively communicated with two ends of the cooling cylinder.

[0013] Preferably, a plurality of second heat dissipation grilles are arranged at equal angles on the outside of the cooling tube, a plurality of semiconductor refrigeration fins are installed inside the cooling tube, and the plurality of semiconductor refrigeration fins are connected end to end in a polygonal shape and are located inside the cooling tube, the heat-absorbing end of the semiconductor refrigeration fin is in contact with the air in the cooling tube, and the heat-releasing end of the semiconductor refrigeration fin is in contact with the inner wall of the cooling tube.

[0014] Preferably, one end of the rotor shaft is connected to the bearing in the end shell, and the outer side of the other end of the rotor shaft is provided with a gear-shaped protrusion, and the inner side of the gear-shaped protrusion is provided with a circular limiting protrusion.

[0015] Preferably, a mounting groove is provided through the middle of the rotor, and the inner wall of the mounting groove is set as a gear-shaped groove, and the gear-shaped groove is adapted to the gear-shaped protrusion of the rotor shaft, and both ends of the mounting groove are provided with limit grooves adapted to the limit protrusions.

[0016] Preferably, a through hole is opened on the rotor shaft, and a rotary joint connected to the outer end of the rotor shaft is installed on the outer side of the end cover, wherein the two rotary joints on one end cover are connected to the water inlet pipe, and the two rotary joints on the other end cover are connected to the water outlet pipe.

[0017] Preferably, an axial air inlet connected to the pump cavity of the pump body is opened on the inner wall of the end shell, and the axial air inlet is located on the exhaust path of the rotor rotation. An axial exhaust port located outside the pump body is opened on the inner wall of the end shell, and the axial exhaust port and the axial air inlet are connected through a gas channel inside the end shell.

[0018] A method for using an air-cooled claw pump that is easy to repair and replace. The specific operating steps of the method are as follows:

[0019] Step 1: Install the rotor shaft in the end shell, and then connect the rotor to the ends of the rotor shaft in the end shell. At this time, the gear-shaped protrusion of the rotor shaft is engaged with the gear-shaped groove of the rotor, and the limiting protrusion is engaged with the limiting groove to achieve sealing at both ends of the installation groove. Then, connect the two ends of the pump body to the end shell with bolts;

[0020] Step 2: Air enters the pump chamber from the air inlet. During the rotation of the rotor shaft and rotor, the rotor drives the air to gradually move from the upper part of the pump chamber to the lower part of the pump chamber. When the air passes through the axial air inlet, part of the air is discharged from the axial exhaust port through the gas channel. The remaining air continues to be compressed and discharged through the exhaust port.

[0021] Step 3: When the air-cooled claw pump is working, the external water pump injects cooling water into the water inlet and the water inlet pipe. The cooling water in the water inlet is discharged from the water outlet through the cooling water channel. When the air in the pump cavity is transferred and compressed, the air is cooled. The cooling water in the water inlet pipe enters the through hole of the rotor shaft and the mounting groove of the rotor through the rotary joint, cooling the rotor shaft and the inside of the rotor. The cooling water is finally discharged from the rotary joint and the water outlet pipe.

[0022] Step 4: Part of the exhausted air passes through the first return pipe and enters the cooling cylinder. At this time, the semiconductor refrigeration plate works to cool the air entering the cooling cylinder. The cooled air re-enters the pump body through the second return pipe and the cooling cylinder to cool the outside of the rotor.

[0023] The beneficial effects of the present invention are as follows: the rotor shaft and the rotor are assembled, the rotor shafts are respectively installed at both ends of the rotor, and the rotor and the rotor shaft are engaged and limited by the gear-shaped protrusions and the gear-shaped grooves, thereby ensuring the normal rotation of the rotor and the rotor shaft. When the rotor is worn or damaged by foreign matter, the end shell and the pump body at one end are separated, and then the rotor shaft and the rotor are axially moved to separate the separated rotor shaft and the rotor, and then the new rotor is axially moved and installed with the rotor shaft, thereby realizing convenient disassembly, replacement and maintenance of the rotor.

[0024] When the two rotors rotate, axial two-way exhaust is achieved through the axial air inlet and axial exhaust port set on the end shell, achieving graded exhaust, improving exhaust efficiency, reducing the residence time of air in the pump cavity, and thus reducing heat accumulation in the pump body;

[0025] By circulating cooling water in the cooling water channel of the rib wall, the air inside the pump body is cooled when the rotor rotates to transfer the air, and the exhaust air is initially cooled at the same time;

[0026] Part of the exhausted air passes through the first return pipe and enters the cooling cylinder. At this time, the semiconductor refrigeration plate works to cool the air entering the cooling cylinder. The cooled air re-enters the pump body through the second return pipe and the cooling cylinder to cool the outside of the rotor.

[0027] The cooling water from the water inlet pipe enters the through hole of the rotor shaft and the mounting groove of the rotor through the rotary joint. At this time, the gear-shaped groove of the rotor not only meshes with the gear-shaped protrusion, but also increases the contact area with the cooling water, improves the heat exchange efficiency between the cooling water and the inner wall of the rotor, and cools the rotor shaft and the inside of the rotor;

[0028] By means of staged exhaust, the residence time of air in the pump cavity is reduced, and the heat of air compression is reduced. The cooling water circulation in the pump body can cool the air in the pump cavity. The outside of the rotor is cooled by the cooling backflow of the exhaust air. The inside of the rotor and the rotor shaft is cooled by the water circulation. Therefore, when the pumping volume and pumping speed of the pump body are increased, the compression heat is too large and the rotor is prevented from being stuck and damaged due to thermal expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the first overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the second overall structure of the present invention;

[0031] Figure 3 This is a cross-sectional view of the rib wall of the present invention;

[0032] Figure 4 It is a partial cross-sectional view of the end shell of the present invention;

[0033] Figure 5 This is a schematic diagram of the rotor shaft and rotor structure of the present invention;

[0034] Figure 6 It is a schematic diagram of the internal structure of the cooling cylinder of the present invention.

[0035] Legend:

[0036] 1. Pump body; 2. End shell; 3. End cover; 4. Support leg; 5. Rotor shaft; 6. Rotor; 7. Air inlet; 8. Exhaust port; 9. Rib wall; 10. First heat sink; 11. Water inlet nozzle; 12. Water outlet nozzle; 13. Cooling water channel; 14. Cooling air inlet nozzle; 15. First return pipe; 16. Second return pipe; 17. Cooling cylinder; 18. Gear-shaped protrusion; 19. Limiting protrusion; 20. Through hole; 21. Mounting groove; 22. Gear-shaped groove; 23. Limiting groove; 24. Rotary joint; 25. Water inlet pipe; 26. Water outlet pipe; 27. Axial air inlet; 28. Axial exhaust port; 29. ​​Gas channel; 30. Semiconductor refrigeration plate; 31. Second heat sink. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] Specific examples are given below.

[0039] See also Figures 1 to 6, an air-cooled claw pump that is easy to repair and replace, includes a pump body 1, an end shell 2, an end cover 3, a support leg 4, a rotor shaft 5 and a rotor 6. Both ends of the pump body 1 are open, and the end shells 2 are respectively installed at both ends of the pump body 1, and the end covers 3 are installed on the outside of the end shell 2. Support legs 4 are provided on the bottom side of the end shell 2. Two rotor shafts 5 are rotatably installed inside the end shell 2. Two rotors 6 are rotatably installed in the pump cavity of the pump body 1, and the two ends of the rotor 6 are respectively plugged into the rotor shaft 5 of the end shell 2. One end of the rotor shaft 5 is connected to the bearing in the end shell 2, and the outer side of the other end of the rotor shaft 5 is provided with a gear-shaped protrusion 18, and the inner side of the gear-shaped protrusion 18 is provided with a circular limiting protrusion 19. A mounting groove 21 is opened through the middle of the rotor 6, and the inner wall of the mounting groove 21 is provided with a gear-shaped groove 22, and the gear-shaped groove 22 is adapted to the gear-shaped protrusion 18 of the rotor shaft 5. Limiting grooves 23 adapted to the limiting protrusion 19 are opened at both ends of the mounting groove 21. 6 are respectively installed with rotor shafts 5 at both ends, and the rotor 6 and the rotor shaft 5 are engaged and limited by gear-shaped protrusions 18 and gear-shaped grooves 22 to ensure the normal rotation of the rotor 6 and the rotor shaft 5. When the rotor 6 is worn or damaged by foreign matter, the end shell 2 and the pump body 1 are separated at one end, and then the rotor shaft 5 and the rotor 6 are axially moved to separate the rotor shaft 5 and the rotor 6. A through hole 20 is opened on the rotor shaft 5, and a rotary joint 24 connected to the outer end of the rotor shaft 5 is installed on the outer side of the end cover 3. The two rotary joints 24 on one end cover 3 are connected to the water inlet pipe 25, and the two rotary joints 24 on the other end cover 3 are connected to the water outlet pipe 26. The cooling water of the water inlet pipe 25 enters the through hole 20 of the rotor shaft 5 and the mounting groove 21 of the rotor 6 through the rotary joint 24 to cool the inside of the rotor shaft 5 and the rotor 6. The cooling water is finally discharged from the rotary joint 24 and the water outlet pipe 26;

[0040] The other end of the rotor shaft 5 is located in the end shell 2 and is equipped with a slave gear, and the two slave gears are meshed with each other. A reducer is installed on one of the end shells 2. The output end of the reducer is located in the end shell 2 and is equipped with a driving tooth, and the driving tooth is meshed with one of the slave gears. The input end of the reducer is connected to the output end of the motor.

[0041] The top side of the pump body 1 is provided with an air inlet 7, the bottom side of the pump body 1 is provided with an exhaust port 8, the two opposite middle parts of the pump body 1 are horizontally provided with rib walls 9, and a plurality of first heat dissipation grilles 10 are evenly spaced on the rib walls 9;

[0042] The pump body 1 is provided with a cooling mechanism for cooling the discharged air and a reflux mechanism for cooling the air backflow;

[0043] The cooling mechanism includes a cooling water channel 13 provided inside the rib wall 9. The two ends of the cooling water channel 13 are respectively connected to the water inlet 11 and the water outlet 12 at the two ends of the rib wall 9. By circulating cooling water in the cooling water channel 13 of the rib wall 9, the air inside the pump body 1 is cooled when the rotor 6 rotates to transfer the air, and the discharged air is preliminarily cooled.

[0044] The reflux mechanism includes a cooling air inlet 14 connected to the air inlet 7, and a first reflux pipe 15 is connected to the cooling air inlet 14. The reflux mechanism also includes a second reflux pipe 16 connected to the exhaust port 8. The first reflux pipe 15 and the second reflux pipe 16 are respectively connected to the two ends of the cooling tube 17. A plurality of second heat dissipation grids 31 are arranged at equal angles on the outside of the cooling tube 17. A plurality of semiconductor refrigeration plates 30 are installed inside the cooling tube 17, and the plurality of semiconductor refrigeration plates 30 are polygonally connected end to end and are located in the cooling tube 17. The heat absorption end of the semiconductor refrigeration plate 30 contacts the air in the cooling tube 17, and the heat release end of the semiconductor refrigeration plate 30 contacts the inner wall of the cooling tube 17. Part of the exhausted air enters the cooling tube 17 through the first reflux pipe 15. At this time, the semiconductor refrigeration plate 30 works to cool the air entering the cooling tube 17. The cooled air re-enters the pump body 1 through the second reflux pipe 16 and the cooling tube 17 to cool the outside of the rotor 6.

[0045] An axial air inlet 27 connected to the pump chamber of the pump body 1 is provided on the inner wall of the end shell 2, and the axial air inlet 27 is located on the rotating exhaust path of the rotor 6. An axial exhaust port 28 located on the outer side of the pump body 1 is provided on the inner wall of the end shell 2, and the axial exhaust port 28 and the axial air inlet 27 are connected through a gas channel 29 inside the end shell 2. The rotor 6 drives the air to gradually move from the top of the pump chamber to the bottom of the pump chamber. When the air passes through the axial air inlet 27, part of the air is discharged from the axial exhaust port 28 through the gas channel 29, and the remaining air continues to be compressed and discharged through the exhaust port 8, thereby realizing graded exhaust, improving exhaust efficiency, reducing the residence time of air in the pump chamber, and thereby reducing heat accumulation in the pump body 1.

[0046] A method for using an air-cooled claw pump that is easy to repair and replace. The specific operating steps of the method are as follows:

[0047] Step 1: Install the rotor shaft 5 in the end shell 2, and then connect the rotor 6 to the ends of the rotor shaft 5 in the end shell 2. At this time, the gear-shaped protrusion 18 of the rotor shaft 5 is engaged with the gear-shaped groove 22 of the rotor 6, and the limiting protrusion 19 is engaged with the limiting groove 23 to achieve sealing of both ends of the installation groove 21. Then, connect the two ends of the pump body 1 to the end shell 2 with bolts;

[0048] Step 2: Air enters the pump chamber from the air inlet 7. As the rotor shaft 5 and rotor 6 rotate, the rotor 6 drives the air from the upper part of the pump chamber to the lower part of the pump chamber. When the air passes through the axial air inlet 27, part of the air is discharged from the axial exhaust port 28 through the gas channel 29. The remaining air continues to be compressed and is discharged through the exhaust port 8.

[0049] Step 3: When the air-cooled claw pump is working, the external water pump injects cooling water into the water inlet nozzle 11 and the water inlet pipe 25. The cooling water in the water inlet nozzle 11 is discharged from the water outlet nozzle 12 through the cooling water channel 13. When the air in the pump chamber is transferred and compressed, the air is cooled. The cooling water in the water inlet pipe 25 enters the through hole 20 of the rotor shaft 5 and the mounting groove 21 of the rotor 6 through the rotary joint 24, cooling the inside of the rotor shaft 5 and the rotor 6. The cooling water is finally discharged from the rotary joint 24 and the water outlet pipe 26.

[0050] Step 4: A portion of the exhausted air passes through the first return pipe 15 and enters the cooling cylinder 17. At this time, the semiconductor refrigeration plate 30 works to cool the air entering the cooling cylinder 17. The cooled air re-enters the pump body 1 through the second return pipe 16 and the cooling cylinder 17 to cool the outside of the rotor 6.

[0051] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An air-cooled claw pump that is easy to repair and replace, characterized in that: The invention comprises a pump body (1), an end shell (2), an end cover (3), a support leg (4), a rotor shaft (5) and a rotor (6), wherein both ends of the pump body (1) are open, and the end shells (2) are respectively installed at both ends of the pump body (1), and the end cover (3) is installed on the outside of the end shell (2), and the bottom side of the end shell (2) is provided with a support leg (4), and two rotor shafts (5) are rotatably installed inside the end shell (2), and two rotors (6) are rotatably installed in the pump cavity of the pump body (1), and the two ends of the rotor (6) are respectively connected to the rotor shaft (5) of the end shell (2), an air inlet (7) is provided on the top side of the pump body (1), and an exhaust port (8) is provided on the bottom side of the pump body (1), and rib walls (9) are horizontally provided at two opposite middle parts of the pump body (1), and a plurality of first heat dissipation grilles (10) are evenly spaced on the rib walls (9); The pump body (1) is provided with a cooling mechanism for cooling the discharged air and a reflux mechanism for cooling and refluxing the air; One end of the rotor shaft (5) is connected to the bearing in the end shell (2), and the outer side of the other end of the rotor shaft (5) is provided with a gear-shaped protrusion (18), and the inner side of the gear-shaped protrusion (18) is provided with a circular limiting protrusion (19). A mounting groove (21) is provided through the middle of the rotor (6), and the inner wall of the mounting groove (21) is provided with a gear-shaped groove (22), and the gear-shaped groove (22) is adapted to the gear-shaped protrusion (18) of the rotor shaft (5). Both ends of the mounting groove (21) are provided with limiting grooves (23) adapted to the limiting protrusion (19). A through hole (20) is provided through the rotor shaft (5). A rotary joint (24) connected to the outer end of the rotor shaft (5) is installed on the outer side of the end cover (3), wherein the two rotary joints (24) on one of the end covers (3) are connected to the water inlet pipe (25), and the two rotary joints (24) on the other end cover (3) are connected to the water outlet pipe (26).

2. The air-cooled claw pump that is easy to repair and replace according to claim 1 is characterized in that: The cooling mechanism comprises a cooling water channel (13) opened inside the rib wall (9), and two ends of the cooling water channel (13) are respectively connected to a water inlet (11) and a water outlet (12) at two ends of the rib wall (9).

3. The air-cooled claw pump that is easy to repair and replace according to claim 2, characterized in that: The reflux mechanism comprises a cooling air inlet (14) in communication with the air inlet (7), and a first reflux pipe (15) is connected to the cooling air inlet (14); The reflux mechanism further comprises a second reflux pipe (16) in communication with the exhaust port (8), and the first reflux pipe (15) and the second reflux pipe (16) are respectively in communication with two ends of the cooling cylinder (17).

4. The air-cooled claw pump that is easy to repair and replace according to claim 3, characterized in that: A plurality of second heat dissipation grids (31) are arranged at equal angles on the outside of the cooling tube (17), and a plurality of semiconductor cooling fins (30) are installed inside the cooling tube (17), and the plurality of semiconductor cooling fins (30) are connected end to end in a polygonal shape and are located inside the cooling tube (17), the heat absorbing end of the semiconductor cooling fin (30) is in contact with the air inside the cooling tube (17), and the heat releasing end of the semiconductor cooling fin (30) is in contact with the inner wall of the cooling tube (17).

5. The air-cooled claw pump that is easy to repair and replace according to claim 4, characterized in that: The inner wall of the end shell (2) is provided with an axial air inlet (27) connected to the pump cavity of the pump body (1), and the axial air inlet (27) is located on the rotating exhaust path of the rotor (6). The inner wall of the end shell (2) is provided with an axial exhaust port (28) located outside the pump body (1), and the axial exhaust port (28) and the axial air inlet (27) are connected through a gas channel (29) inside the end shell (2).

6. The method for using the air-cooled claw pump that is easy to repair and replace according to claim 5, characterized in that: The specific steps of this method are as follows: Step 1: Install the rotor shaft (5) in the end shell (2), and then connect the rotor (6) to the ends of the rotor shaft (5) in the end shell (2). At this time, the gear-shaped protrusion (18) of the rotor shaft (5) is engaged with the gear-shaped groove (22) of the rotor (6), and the limiting protrusion (19) is engaged with the limiting groove (23) to achieve sealing of the two ends of the installation groove (21). Then, the two ends of the pump body (1) are connected to the end shell (2) by bolts. Step 2: Air enters the pump chamber from the air inlet (7). During the rotation of the rotor shaft (5) and the rotor (6), the rotor (6) drives the air to gradually move from the upper part of the pump chamber to the lower part of the pump chamber. When the air passes through the axial air inlet (27), part of the air is discharged from the axial exhaust port (28) through the gas channel (29). The remaining air continues to be compressed and is discharged through the exhaust port (8). Step 3: When the air-cooled claw pump is working, the external water pump works to inject cooling water into the water inlet nozzle (11) and the water inlet pipe (25). The cooling water of the water inlet nozzle (11) is discharged from the water outlet nozzle (12) through the cooling water channel (13). When the air in the pump chamber is transferred and compressed, the air is cooled. The cooling water of the water inlet pipe (25) enters the through hole (20) of the rotor shaft (5) and the mounting groove (21) of the rotor (6) through the rotary joint (24), and cools the inside of the rotor shaft (5) and the rotor (6). The cooling water is finally discharged from the rotary joint (24) and the water outlet pipe (26); Step 4: A portion of the exhausted air passes through the first return pipe (15) and enters the cooling cylinder (17). At this time, the semiconductor refrigeration plate (30) works to cool the air entering the cooling cylinder (17). The cooled air passes through the second return pipe (16) and the cooling cylinder (17) and re-enters the pump body (1) to cool the outside of the rotor (6).

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