CN216086291U

CN216086291U - Water-cooled motor

Info

Publication number: CN216086291U
Application number: CN202122376985.6U
Authority: CN
Inventors: 何敏剑; 翁建武; 陈科力
Original assignee: Zhejiang Fangyuanlixin Vacuum Equipment Co ltd
Current assignee: Zhejiang Fangyuanlixin Vacuum Equipment Co ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-03-18
Anticipated expiration: 2031-09-28

Abstract

The utility model provides a water-cooled motor, and belongs to the technical field of motor manufacturing. The motor solves the problem that the existing motor can not effectively conduct away heat on a rotor in a heat transfer mode. This water cooled machine, including motor housing body and front end housing, the rear end cap, be provided with the stator in the motor housing body, rotor and motor shaft, be provided with the fore bearing between front end housing and the motor shaft, be provided with the rear bearing between rear end housing and the motor shaft, rotor and motor shaft are at circumferencial direction fixed coordination, there is the clearance in the outside that the stator is fixed on the inner wall of motor housing body and is in the rotor and rotor, be provided with the interior water-cooling passageway that is used for cooling the rotor between motor shaft and the rotor, be provided with the outer water-cooling passageway that is used for cooling the stator on the motor housing body, interior water-cooling passageway and outer water-cooling passageway intercommunication are used for the interior of motor, the external cooling. The utility model effectively reduces the temperature of the rotor and ensures the safe and reliable operation of the motor; the motor has high service power and long service life.

Description

Water-cooled motor

Technical Field

The utility model belongs to the technical field of motor manufacturing, and relates to a water-cooled motor.

Background

The motor rotates at a high speed to increase the power density of the motor, and simultaneously, the loss of the unit volume of the motor and the working temperature rise of the motor are obviously increased compared with the common motor, and the cooling and heat dissipation problems are more prominent. The existing motor generally adopts a cooling mode of air cooling on the surface of a machine shell or oil or water passing through the machine shell, but when the motor runs at a high speed, heat generated by a motor rotor cannot be cooled through the cooling mode, the cooling effect is poor, the motor rotor is easy to overheat, and finally the motor is in an overtemperature state to work, so that the motor is damaged.

In view of the above problem, a motor having a stator and a rotor that are cooled simultaneously appears in the market, for example, chinese patent nos.: the "201811269771.5" authorization notice number is: CN109256902A discloses a stator-rotor integrated circulative cooling high-speed permanent magnet motor, which specifically comprises a rotor shaft and a cooling channel, wherein the rotor shaft is a hollow shaft with one end open and the other end closed, the hollow shaft is provided with a through hole leading to the outer wall of the rotor shaft, the open end of the rotor shaft is provided with a cooling oil tank, and the rotor shaft is communicated with the cooling oil tank; a liquid flow guiding device is fixedly sleeved on the rotor shaft, one end of the liquid flow guiding device is communicated with the rotor shaft through a through hole, and the other end of the liquid flow guiding device is communicated with the cooling channel; the cooling channel is communicated with the cooling oil tank.

In the above structure, the rotor shaft is a hollow shaft, the cooling oil tank performs heat transfer cooling on the hollow hole in the rotor shaft through the hollow hole of the rotor shaft, the rotor shaft has a certain cooling effect, but no cooling channel is arranged between the rotor shaft and the rotor, the heat transfer cooling on the rotor is performed through the hollow hole of the rotor shaft, the heat transfer effect of the rotor is gradually weakened, the cooling effect of the rotor is poor, the heat on the rotor cannot be effectively conducted away through a heat transfer mode, and therefore the working reliability of the motor is affected, the service power is low, and the service life is short.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, and provides the water-cooled motor which has a simple structure, can effectively reduce the temperature of a rotor and a stator in the motor in a heat transfer mode, has a good cooling effect, and avoids the motor from being damaged due to high temperature.

The purpose of the utility model can be realized by the following technical scheme: a water-cooled motor comprises a cylindrical motor shell body with two open ends, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are used for sealing two ends of the motor shell body, a stator, a rotor and a motor shaft are arranged in the motor shell body, the front end of the motor shaft extends out of the front end cover, a front bearing is arranged between the front end cover and the motor shaft, the rear end of the motor shaft extends out of the rear end cover, a rear bearing is arranged between the rear end cover and the motor shaft, the rotor and the motor shaft are fixedly matched in the circumferential direction, the stator is fixed on the inner wall of the motor shell body, a gap exists between the outer side of the rotor and the rotor, the water-cooled motor is characterized in that an inner water-cooled channel for cooling the rotor is arranged between the motor shaft and the rotor, an outer water-cooled channel for cooling the stator is arranged on the motor shell body, and the inner water-cooled channel and the outer water-cooled channel are communicated with the inner water-cooled channel and the outer water-cooled channel for the motor, And (5) externally cooling.

This water cooled machine is to motor shaft in the motor, rotor and stator set up refrigerated runner, this motor shaft, the inside circulation of both inside circulations of rotor once sets up interior water-cooling passageway, the stator extrinsic cycle once sets up outer water-cooling passageway, link to each other through interior water-cooling passageway and outer water-cooling passageway and carry out circulative cooling, this interior water-cooling passageway sets up between motor shaft and rotor, not only to the cooling of motor shaft, but also carry out effectual cooling to the rotor, the motor shaft, the rotor carries out the heat transfer cooling simultaneously, the water-cooling flow cooling covers the face wider, there is not local stagnant water, the local overheat of motor has been avoided, the cooling effect is better.

In the above-mentioned water-cooled machine, the interior water-cooling passageway including all set up first water inlet pipe joint, the first water pipe joint on the rear end cap, the motor shaft on have the cooling bath of the rear end that the axial runs through the motor shaft, the tank bottom of the cooling bath of motor shaft cooling bath have the axial and extend the cooling blind hole that sets up forward, the front end of the cooling blind hole of motor shaft radial preceding intercommunicating pore has, the rear end of the cooling blind hole of motor shaft radial back intercommunicating pore has, the inner wall of rotor on be provided with the interior cooling water runner, the interior cooling water runner radial intercommunication through radial preceding intercommunicating pore and cooling blind hole, the interior cooling water runner radial intercommunication through radial back intercommunicating pore and cooling bath, the cooling bath through first water pipe joint play water, the cooling bath of motor shaft in have the isolation tube with the axial setting, the isolation pipe is axially communicated with the cooling blind hole, and the isolation pipe is connected with water through a first water inlet pipe to feed water. The cooling tank on the motor shaft, the cooling blind hole is used for being directed at the cooling motor shaft, interior cooling water runner on the inner wall of rotor is used for being directed at the cooling rotor, this interior cooling water runner sets up on the inner wall of rotor, this interior cooling water runner concrete mode of setting on the inner wall of rotor does, the inner wall circumference interval distribution of rotor has the runner groove that is the axial setting, before the adjacent runner groove, back dislocation intercommunication forms endless interior cooling water runner, the purpose that sets up like this is the cooling area who increases the rotor, improve the effective cooling of rotor, the cooling effect is better.

In foretell water cooled machine, the same axial of the notch of the cooling tank of motor shaft wear to be equipped with and compress tightly the joint, the rear end of isolation tube stretch into compress tightly in the joint, this isolation tube seals the assembly through the cooling tank of compressing tightly joint and motor shaft, the front end of isolation tube stretch into in the cooling blind hole and cooling blind hole axial intercommunication. The effect of compressing tightly the joint does: the first is used for ensuring the axial center degree of the assembly of the isolation pipe on the motor shaft, effectively preventing the isolation pipe from radially moving in a cooling groove of the motor shaft and ensuring the stability of the assembly of the isolation pipe on the motor shaft; and secondly, the cooling channel is used for isolating the cooling channel in the cooling tank and the isolating pipe, so that the circulating cooling of an inner cooling water channel between the motor shaft and the rotor, which is damaged by mutual flow between the cooling tank and the isolating pipe, is prevented, and the structure is stable.

In the above water-cooled motor, the middle position of the rear end cover is provided with a cylindrical connecting seat which is arranged in an outward protruding manner, the end part of the connecting seat is provided with an oil seal seat which is fixedly connected with the connecting seat in a sealing and butt joint manner, the rear end of the motor shaft axially extends to a position between the connecting seat and the oil seal seat, the first water inlet pipe joint is fixedly arranged on the oil seal seat, the first water inlet pipe joint is opposite to the isolation pipe in the same axial direction, the first water outlet pipe joint is fixedly arranged on the connecting seat, and the first water outlet pipe joint is communicated with the cooling groove in the radial direction. The purpose of setting up like this is to carry out the circulation isolation of cooling to first water inlet pipe connector, first water outlet pipe connector, guarantees that both relatively independently carry out cooling cycle, stable in structure.

In foretell water cooled machine, connecting seat and motor shaft between be provided with first oil blanket, oil blanket seat and motor shaft between be provided with the second oil blanket, first oil blanket and the cooperation of second oil blanket axial interval form annular channel, circumference interval distribution has the perforating hole that is radial setting on the motor shaft that is located between first oil blanket, the second oil blanket, the cooling bath pass through perforating hole, annular channel and first water pipe joint intercommunication. The purpose of this setting is to make the motor shaft have relative closed annular channel all the time under the state of rotation, and the through-hole on this motor shaft all the time carries out radial intercommunication with annular channel, and the structure of the butt joint of cooling flow channel is stable.

In foretell water cooled machine, outer water cooling passageway including all set up second water inlet pipe joint, the second water pipe joint on motor housing body, the stator on the cover be equipped with the sealed complex neck bush of motor housing body, neck bush and motor housing body between be provided with outer cooling water runner, this outer cooling water runner's water inlet and second water inlet pipe joint intercommunication, this outer cooling water runner's delivery port and second water pipe joint intercommunication. In actual manufacturing, the middle of the inner bushing is thinner, and the two ends of the inner bushing are thicker, so that the purposes of the arrangement are as follows: the inner bushing is used for forming a water interlayer, is thin in the middle, fast in heat transfer and easy to deform, and is tightly attached to the surface of the stator under the action of water pressure, so that the heat transfer effect of the stator is improved; the two ends are thick, the strength is high, the deformation is difficult, the sealing contact with the two ends of the motor shell is realized, and the sealing is reliable; during actual assembly, the motor outer shell and the inner lining are in interference fit, during assembly, the positioning is correct, and when the inner lining deforms slightly, the water interlayer cannot leak water.

In the above water-cooled motor, a cooling water pipe is arranged between the first water outlet pipe joint and the second water inlet pipe joint, and the inner cooling water flow passage and the outer cooling water flow passage are communicated through the cooling water pipe for inner and outer cooling of the motor. The external water-cooling circulation that carries on of condenser tube, convenient to detach, easy to overhaul, convenient to use.

In the above water-cooled motor, the motor outer shells at the two ends of the stator are respectively provided with epoxy resins for supporting the two ends of the inner bushing, and the front end cover, the rear end cover and the corresponding epoxy resin are attached and matched. The epoxy resin at the two ends enhances the strength of the inner bushing, ensures that the water interlayer is not leaked, and is beneficial to the fixation and heat conduction of the exposed coils at the two ends of the stator.

In the above water-cooled motor, the front end cover is provided with a check valve, and the check valve is used for connecting with a negative pressure pipe. The motor outer shell is connected with a negative pressure pipe through a one-way valve, and the interior of the motor outer shell is vacuumized through the negative pressure pipe, so that the stator and the inner bushing are fully attached and matched.

In the water-cooled motor, the rear end cover is provided with an air release hole, and an air release plug is plugged in the air release hole. The air-release plug is used for destroying vacuum in a motor during disassembly, is convenient to disassemble and is convenient to use.

Compared with the prior art, the water-cooled motor has the advantages that: the cooling device has the advantages that the structural design is reasonable and simple, the motor shaft, the rotor and the stator share the integrated cooling, the structural improvement is made especially for the first internal circulation cooling of the motor shaft and the rotor of the motor, the heat generated by the rotor due to eddy current loss can be taken away, the temperature of the rotor is effectively reduced, the phenomenon of thermal demagnetization of the motor in a high-temperature environment is avoided, and the safe and reliable operation of the motor is ensured; the motor has high service power and long service life.

Drawings

Fig. 1 is a schematic sectional structure view of the water-cooled motor.

Fig. 2 is a left side view structural schematic diagram of the water-cooled motor.

In the figure, 1, a motor outer shell; 2. a front end cover; 3. a rear end cap; 4. a stator; 5. a rotor; 6. a motor shaft; 7. a front bearing; 8. a rear bearing; 9. a first water inlet pipe joint; 10. a first water outlet pipe joint; 11. a cooling tank; 12. cooling the blind holes; 13. a radial front communication hole; 14. a radial rear communication hole; 15. cooling the water flow channel inside; 16. an isolation pipe; 17. compressing the joint; 18. a connecting seat; 19. an oil seal seat; 20. a first oil seal; 21. a second oil seal; 22. an annular channel; 23. a through hole; 24. a second water inlet pipe joint; 25. a second water outlet pipe joint; 26. an inner liner; 27. an external cooling water flow passage; 28. a cooling water pipe; 29. an epoxy resin; 30. a one-way valve; 31. and (7) an air-discharging plug.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the water-cooled motor mainly comprises a cylindrical motor outer shell 1 with two open ends, a front end cover 2 and a rear end cover 3 are fixedly connected to the motor outer shell 1, the front end cover 2 and the rear end cover 3 are used for sealing the front end and the rear end of the motor outer shell 1, a stator 4, a rotor 5 and a motor shaft 6 are arranged in the motor outer shell 1, the front end of the motor shaft 6 extends out of the front end cover 2, a front bearing 7 is arranged between the front end cover 2 and the motor shaft 6, the rear end of the motor shaft 6 extends out of the rear end cover 3, a rear bearing 8 is arranged between the rear end cover 3 and the motor shaft 6, the rotor 5 and the motor shaft 6 are fixedly matched in the circumferential direction, the stator 4 is fixed on the inner wall of the motor outer shell 1 and is positioned at a gap between the outer side of the rotor 5 and the rotor 5, an inner water-cooling channel for cooling the rotor 5 is arranged between the motor shaft 6 and the rotor 5, an outer water cooling channel for cooling the stator 4 is arranged on the motor outer shell 1, and the inner water cooling channel and the outer water cooling channel are communicated for inner and outer cooling of the motor.

In actual manufacturing, the inner water cooling channel comprises a first water inlet pipe joint 9 and a first water outlet pipe joint 10 which are all arranged on the rear end cover 3, a cooling groove 11 axially penetrating through the rear end of the motor shaft 6 is arranged on the motor shaft 6, a cooling blind hole 12 axially extending forwards is arranged at the bottom of the cooling groove 11 of the motor shaft 6, a radial front communication hole 13 is arranged at the front end of the cooling blind hole 12 of the motor shaft 6, a radial rear communication hole 14 is arranged at the rear end of the cooling blind hole 12 of the motor shaft 6, an inner cooling water flow channel 15 is arranged on the inner wall of the rotor 5, the inner cooling water flow channel 15 is radially communicated with the cooling blind hole 12 through the radial front communication hole 13, the inner cooling water flow channel 15 is radially communicated with the cooling groove 11 through the radial rear communication hole 14, the cooling groove 11 is discharged through the first water outlet pipe joint 10, a coaxially arranged isolation pipe 16 is arranged in the cooling groove 11 of the motor shaft 6, and the isolation pipe 16 is axially communicated with the cooling blind hole 12, the isolation pipe 16 is filled with water through the first water inlet pipe joint 9; in actual manufacturing, a pressing joint 17 is arranged in the same axial direction on the notch of the cooling groove 11 of the motor shaft 6, the rear end of the isolation pipe 16 extends into the pressing joint 17, the isolation pipe 16 is hermetically assembled with the cooling groove 11 of the motor shaft 6 through the pressing joint 17, and the front end of the isolation pipe 16 extends into the cooling blind hole 12 and is axially communicated with the cooling blind hole 12.

During actual manufacturing, a cylindrical connecting seat 18 protruding outwards is arranged in the middle of the rear end cover 3, an oil seal seat 19 connected with the connecting seat 18 in a sealing and butt joint mode is arranged at the end portion of the connecting seat 18, the rear end of the motor shaft 6 axially extends to a position between the connecting seat 18 and the oil seal seat 19, the first water inlet pipe joint 9 is fixedly arranged on the oil seal seat 19, the first water inlet pipe joint 9 and the isolation pipe 16 are opposite in the same axial direction, the first water outlet pipe joint 10 is fixedly arranged on the connecting seat 18, and the first water outlet pipe joint 10 is communicated with the cooling groove 11 in the radial direction; be provided with first oil blanket 20 between this connecting seat 18 and the motor shaft 6, be provided with second oil blanket 21 between oil blanket seat 19 and the motor shaft 6, first oil blanket 20 and the cooperation of second oil blanket 21 axial interval form annular channel 22, and the circumference interval distribution has the perforating hole 23 that is radial setting on the motor shaft 6 that is located between first oil blanket 20, the second oil blanket 21, and cooling tank 11 passes through perforating hole 23, annular channel 22 and the first water pipe joint 10 intercommunication.

The cooling circulation of the internal water cooling channel is as follows: cooling water is fed from the first water inlet pipe joint 9, the cooling water flows into the isolation pipe 16, the isolation pipe 16 and the cooling blind hole 12 axially circulate, the cooling water flows into the cooling blind hole 12, the cooling blind hole 12 is communicated with the inner cooling water flow passage 15 through the radial rear communication hole 14, the cooling water flows into the inner cooling water flow passage 15, the inner cooling water flow passage 15 is communicated with the cooling groove 11 through the radial front communication hole 13, the cooling water flows into the cooling groove 11, the cooling groove 11 is communicated with the first water outlet pipe joint 10 through the through hole 23 and the annular channel 22, and the cooling water flows out of the first water outlet pipe joint 10.

During actual manufacturing, the external water cooling channel mainly comprises a second water inlet pipe joint 24 and a second water outlet pipe joint 25 which are both arranged on the motor outer shell 1, an inner bushing 26 which is in sealing fit with the motor outer shell 1 is sleeved on the stator 4, an external cooling water flow channel 27 is arranged between the inner bushing 26 and the motor outer shell 1, a water inlet of the external cooling water flow channel 27 is communicated with the second water inlet pipe joint 24, and a water outlet of the external cooling water flow channel 27 is communicated with the second water outlet pipe joint 25; a cooling water pipe 28 is arranged between the first water outlet pipe joint 10 and the second water inlet pipe joint 24, and the inner cooling water flow passage 15 and the outer cooling water flow passage 27 are communicated through the cooling water pipe 28 for the inner and outer cooling of the motor; in actual manufacturing, the motor outer housing 1 at both ends of the stator 4 is provided with epoxy resin 29 for supporting both ends of the inner bushing 26, and the front end cap 2, the rear end cap 3 and the corresponding epoxy resin 29 are in abutting fit.

In actual manufacturing, the front end cover 2 is provided with a one-way valve 30, the one-way valve 30 is used for being connected with a negative pressure pipe, the interior of the motor outer shell 1 is connected with the negative pressure pipe through the one-way valve 30, and the interior of the motor outer shell 1 is vacuumized through the negative pressure pipe, so that the stator 4 and the inner bushing 26 are fully attached and matched; the rear end cover 3 is provided with an air vent, and an air vent plug 31 is plugged in the air vent.

Those not described in detail in this specification are within the skill of the art. The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Claims

1. A water-cooled motor comprises a cylindrical motor outer shell (1) with two open ends, a front end cover (2) and a rear end cover (3), wherein the front end cover (2) and the rear end cover (3) are used for sealing the two ends of the motor outer shell (1), a stator (4), a rotor (5) and a motor shaft (6) are arranged in the motor outer shell (1), the front end of the motor shaft (6) extends out of the front end cover (2), a front bearing (7) is arranged between the front end cover (2) and the motor shaft (6), the rear end of the motor shaft (6) extends out of the rear end cover (3), a rear bearing (8) is arranged between the rear end cover (3) and the motor shaft (6), the rotor (5) and the motor shaft (6) are fixedly matched in the circumferential direction, the stator (4) is fixed on the inner wall of the motor outer shell (1) and is positioned on the outer side of the rotor (5) and has a gap with the rotor (5), the motor is characterized in that an inner water cooling channel used for cooling the rotor (5) is arranged between the motor shaft (6) and the rotor (5), an outer water cooling channel used for cooling the stator (4) is arranged on the motor outer shell (1), and the inner water cooling channel and the outer water cooling channel are communicated and used for cooling the motor inside and outside.

2. The water-cooled motor of claim 1, wherein the inner water-cooled channel comprises a first water inlet pipe joint (9) and a first water outlet pipe joint (10) which are arranged on the rear end cover (3), the motor shaft (6) is provided with a cooling groove (11) which axially penetrates through the rear end of the motor shaft (6), the groove bottom of the cooling groove (11) of the motor shaft (6) is provided with a cooling blind hole (12) which axially extends forwards, the front end of the cooling blind hole (12) of the motor shaft (6) is provided with a radial front communication hole (13), the rear end of the cooling blind hole (12) of the motor shaft (6) is provided with a radial rear communication hole (14), the inner wall of the rotor (5) is provided with an inner cooling water flow channel (15), and the inner cooling water flow channel (15) is radially communicated with the cooling blind hole (12) through the radial front communication hole (13), the cooling device is characterized in that the inner cooling water flow channel (15) is communicated with the cooling groove (11) in the radial direction through a radial rear communication hole (14), the cooling groove (11) discharges water through a first water outlet pipe joint (10), an isolation pipe (16) which is coaxially arranged is arranged in the cooling groove (11) of the motor shaft (6), the isolation pipe (16) is communicated with the cooling blind hole (12) in the axial direction, and the isolation pipe (16) feeds water through a first water inlet pipe joint (9).

3. The water-cooled motor as claimed in claim 2, characterized in that a compression joint (17) is axially arranged in the same axial direction in the notch of the cooling groove (11) of the motor shaft (6), the rear end of the isolation tube (16) extends into the compression joint (17), the isolation tube (16) is hermetically assembled with the cooling groove (11) of the motor shaft (6) through the compression joint (17), and the front end of the isolation tube (16) extends into the cooling blind hole (12) and is axially communicated with the cooling blind hole (12).

4. The water-cooled motor according to claim 2 or 3, wherein the middle of the rear end cover (3) is provided with a cylindrical connecting seat (18) which protrudes outwards, the end of the connecting seat (18) is provided with an oil seal seat (19) which is fixedly connected with the connecting seat (18) in a sealing and abutting mode, the rear end of the motor shaft (6) axially extends to a position between the connecting seat (18) and the oil seal seat (19), the first water inlet pipe joint (9) is fixedly arranged on the oil seal seat (19), the first water inlet pipe joint (9) and the isolating pipe (16) are opposite to each other in the same axial direction, the first water outlet pipe joint (10) is fixedly arranged on the connecting seat (18), and the first water outlet pipe joint (10) is communicated with the cooling groove (11) in the radial direction.

5. The water-cooled motor of claim 4, wherein a first oil seal (20) is arranged between the connecting seat (18) and the motor shaft (6), a second oil seal (21) is arranged between the oil seal seat (19) and the motor shaft (6), the first oil seal (20) and the second oil seal (21) are axially matched at intervals to form an annular channel (22), through holes (23) which are radially arranged are circumferentially distributed at intervals on the motor shaft (6) between the first oil seal (20) and the second oil seal (21), and the cooling tank (11) is communicated with the first water outlet pipe joint (10) through the through holes (23).

6. The water-cooled motor according to claim 5, characterized in that the external water-cooled channel comprises a second water inlet pipe joint (24) and a second water outlet pipe joint (25) which are both arranged on the motor outer shell (1), the stator (4) is sleeved with an inner bushing (26) which is in sealing fit with the motor outer shell (1), an external cooling water flow channel (27) is arranged between the inner bushing (26) and the motor outer shell (1), a water inlet of the external cooling water flow channel (27) is communicated with the second water inlet pipe joint (24), and a water outlet of the external cooling water flow channel (27) is communicated with the second water outlet pipe joint (25).

7. A water-cooled machine according to claim 6, characterized in that a cooling water pipe (28) is arranged between the first water outlet pipe joint (10) and the second water inlet pipe joint (24), and the inner cooling water flow passage (15) and the outer cooling water flow passage (27) are communicated through the cooling water pipe (28) for inner and outer cooling of the machine.

8. The water-cooled motor according to claim 7, wherein the motor outer shell (1) at the two ends of the stator (4) is respectively provided with epoxy resin (29) for supporting the two ends of the inner bushing (26), and the front end cover (2), the rear end cover (3) and the corresponding epoxy resin (29) are in abutting fit.

9. A water-cooled machine according to claim 1, characterized in that the front cover (2) is provided with a one-way valve (30), the one-way valve (30) being adapted to be connected to a negative pressure pipe.

10. The water-cooled motor according to claim 1, characterized in that the rear end cover (3) is provided with an air vent, and an air vent plug (31) is plugged in the air vent.