CN216819633U - Water-cooled motor - Google Patents

Abstract

The utility model discloses a water-cooled motor, relates to the technical field of motors, and aims to solve the problem that the existing motor is poor in heat dissipation effect, and the technical scheme is as follows: the water cooling device comprises an end cover internally provided with a water cooling cavity, wherein the water cooling cavity is connected with a water inlet and a water outlet, the water inlet is connected with a water inlet pipe through a water inlet joint, the water outlet is connected with a water outlet pipe through a water outlet joint, the water inlet pipe and the water outlet pipe are both connected with one-way valves, and the one-way valves are used for one-way conduction from the water inlet to the water outlet; the water cooling cavity is annular around the motor, and the inside upside in water cooling cavity sets up the division board, and water inlet and delivery port distribute in the both sides of division board. The utility model can improve the heat dissipation efficiency of the motor by introducing the cooling liquid into the water-cooled motor, thereby being beneficial to the long-time high-load operation of the motor.

Description

Water-cooled motor

Technical Field

The utility model relates to the technical field of motors, in particular to a water-cooled motor.

Background

The motor is an electromagnetic device for realizing the conversion of mechanical energy and electric energy. Common motors can be divided into ac motors and dc motors. The development of motors has been accompanied by the development of productivity, which in turn has promoted the continuous improvement of social productivity. With the development of automatic control systems and computer technologies, many kinds of control motors are developed on the basis of the theory of general rotating motors, and the control motors have the characteristics of high reliability, good accuracy and quick response, and become important components of the current industrial development.

Current motor adopts the air-cooled mode to dispel the heat usually, through the heat dissipation muscle and the fan cooperation in the motor outside to give off the heat that motor work produced, in order to maintain the lower temperature of motor. However, the efficiency of air cooling and heat dissipation is low, and under the condition of long-time high-power work, the temperature of the motor is continuously increased, and the normal work of the motor is influenced.

Therefore, a new solution is needed to solve this problem.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solve the above problems and to provide a water-cooled motor, which can improve the heat dissipation efficiency of the motor by introducing a cooling liquid into the water-cooled motor, thereby facilitating the long-time high-load operation of the motor.

The technical purpose of the utility model is realized by the following technical scheme: a water-cooled motor comprises an end cover internally provided with a water-cooled cavity, wherein the water-cooled cavity is connected with a water inlet and a water outlet, the water inlet is connected with a water inlet pipe through a water inlet joint, the water outlet is connected with a water outlet pipe through a water outlet joint, the water inlet pipe and the water outlet pipe are both connected with a one-way valve, and the one-way valve is used for conducting in a one-way mode from the water inlet to the water outlet; the water cooling cavity is annular around the motor, and the inside upside in water cooling cavity sets up the division board, and water inlet and delivery port distribute in the both sides of division board.

The utility model is further provided that the inner side of the water outlet joint is connected with a conduit, and the conduit extends into the water outlet and extends to the middle upper part of the water cooling cavity.

The utility model is further provided that the water inlet joint is connected with a branch pipe, the other end of the branch pipe is connected with a buffer tank, and the buffer tank is used for buffering cooling liquid.

The utility model is further provided that the lower part of the buffer tank is connected with a water supplementing pipe, and the water supplementing pipe is connected with a cooling water source through a booster pump.

The utility model is further arranged that a buffer tube is connected between the water replenishing pipe and the buffer tube corresponding to the booster pump.

The utility model is further configured such that the buffer tube is an elastically extensible bellows.

The utility model is further arranged in that a buffer shell is arranged at the outer side of the buffer tube, the buffer tube is elastically stretched and retracted in the buffer shell, and two end surfaces of the buffer shell are used for abutting against and limiting two ends of the buffer tube so as to limit the maximum elastic expansion amount of the buffer tube; and through holes for the water supply pipes to pass through are formed in two end faces of the buffer pipe.

In conclusion, the utility model has the following beneficial effects:

the water cooling cavity is arranged in the shell of the motor, so that the cooling liquid is circulated and continuously conveyed into the shell of the motor through the water inlet and the water outlet, the heat dissipation efficiency of the motor can be improved, and the long-time high-load operation of the motor is facilitated;

the water cooling cavity is annularly arranged, the water cooling cavity is separated through the separation plate, and the water inlet and the water outlet are distributed at the two side positions of the separation plate, so that the heat exchange path and the heat exchange time of the cooling liquid can be prolonged, and the heat dissipation efficiency of the motor is improved.

Drawings

FIG. 1 is a schematic structural diagram of a water-cooled motor according to the present invention;

FIG. 2 is a schematic structural diagram of a cooling liquid buffer device according to the present invention;

FIG. 3 is a schematic structural diagram of a water-cooled motor system according to the present invention;

FIG. 4 is a schematic view of the structure of the cushion joint of the present invention;

FIG. 5 is a schematic structural view of a buffer cylinder according to the present invention;

FIG. 6 is a schematic view of the piston assembly of the present invention;

fig. 7 is a schematic structural diagram of the adjusting device of the present invention.

Reference numerals: 1. a motor housing; 2. a water-cooled cavity; 3. a partition plate; 4. a water inlet; 5. a water inlet joint; 6. a water outlet; 7. a water outlet joint; 71. a conduit; 8. a water inlet pipe; 9. a water outlet pipe; 10. a one-way valve; 11. a branch pipe; 12. a buffer tank; 13. a water replenishing pipe; 14. a buffer tube; 15. a booster pump; 16. a buffer housing; 17. a through hole; 18. a buffer joint; 19. a baffle plate; 20. a buffer cylinder; 21. a piston device; 22. an annular cavity; 23. a first connecting hole; 24. a second connecting hole; 25. an outer restrictor ring; 26. an inner flow-limiting ring; 27. a restrictor plate; 28. a current limiting spring; 29. a flow restriction orifice; 30. an elastic baffle plate; 31. a seal ring; 32. a support block; 33. a lifting block; 34. a connecting frame; 35. a piston cavity; 36. a piston block; 37. a piston rod; 38. a piston bore; 39. a piston post; 40. a sealing block; 41. a connecting channel; 42. a first connecting port; 43. a second connecting port; 44. an adjusting tube; 45. an adjusting piston; 46. adjusting a rod; 47. briquetting; 47. a bevel; 48. adjusting the spring; 49. an adjusting block; 50. a screw; 51. a screw hole; 52. a protrusion; 53. and a guide cylinder.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Example one

A water-cooled motor comprises a motor shell 1 with a water-cooled cavity 2 arranged therein, wherein the water-cooled cavity 2 can be arranged in the annular shell and front and rear end covers of the motor, the water-cooled cavity 2 is connected with a circulating cooling liquid source through a pipeline, and the cooling liquid is continuously pumped into the water-cooled cavity 2, so that the motor can rapidly dissipate heat.

As shown in fig. 1, taking the structure of a water-cooling cavity 2 of a front end cover of a motor as an example, a water inlet 4 and a water outlet 6 are connected to the upper side of the water-cooling cavity 2, the water inlet 4 is connected to a water inlet pipe 8 through a water inlet joint 5, and the water outlet 6 is connected to a water outlet pipe 9 through a water outlet joint 7; the water inlet pipe 8 and the water outlet pipe 9 are respectively communicated with a cooling liquid source to realize the inlet and outlet of the cooling liquid.

In order to improve the stability of the inlet and outlet of the cooling liquid, the one-way valves 10 can be respectively arranged on the water inlet pipe 8 and the water outlet pipe 9, and the one-way valves 10 can be conducted in one way from the water inlet 4 to the water outlet 6, so that the situations that the backflow is fluctuated due to unstable pressure in the cooling liquid conveying pipeline and the like can be avoided.

This water-cooling chamber 2 is the annular, and around the periphery at the motor, the inside upside position installation division board 3 of water-cooling chamber 2, cut off water-cooling chamber 2 in division board 3 position, and water inlet 4 and delivery port 6 distribute in the both sides position of division board 3, make the coolant liquid can stably encircle the delivery port 6 outflow that just can follow the other end after water-cooling chamber 2 flows after getting into from the one end of water-cooling chamber 2, thereby the heat transfer route and the heat exchange time of extension coolant liquid, improve the radiating efficiency of motor.

A conduit 71 can be connected to the inner side of the water outlet joint 7, the conduit 71 extends into the water outlet 6 and extends to the middle upper part of the water-cooling cavity 2, so that a part of air can be reserved at the extreme position of the water-cooling cavity 2, the conduit 71 can also extend to be below the liquid level, and cooling can also be discharged from the conduit 71; a part of gaps can be reserved in the water cooling cavity 2 so as to form a certain pressure buffer space inside the water cooling cavity 2, so that the water cooling cavity is better suitable for a fluctuating water pressure environment.

Example two

A water-cooled motor is disclosed, which is explained in detail with reference to fig. 2-3 on the basis of the first embodiment, and is further optimized at one end of a water inlet pipe 8 of a water-cooled cavity 2.

The water inlet pipe 8 is connected with a cooling liquid buffer device which comprises a branch pipe 11, a buffer tank 12 and other adaptive components; specifically, as shown in fig. 2, a branch pipe 11 is connected to a lateral side of the water inlet joint 5, so that the water inlet joint 5 forms a three-way structure; the other end of the branch pipe 11 is connected with a buffer tank 12, buffer liquid is stored in the buffer pipe 14, and the pressure of the cooling liquid passing through the water inlet joint 5 can be adjusted by maintaining proper pressure;

the lower part of the buffer tank 12 is connected with a water supplementing pipe 13, the water supplementing pipe 13 is connected with a cooling water source through a booster pump 15, and the water pressure can be compensated in the buffer tank 12 through the booster pump 15; a buffer tube 14 is connected to the water supply pipe 13, and the buffer tube 14 corresponds to a position between the booster pump 15 and the buffer tube 14, and can further buffer the water pressure in the buffer tank 12 to maintain a relatively stable balance of the pressure in the buffer tank 12.

The buffer tube 14 is an elastically stretchable corrugated tube, and can be adapted to the change in pressure in the buffer tank 12 by expansion and contraction of the corrugated tube; and a buffer shell 16 is arranged at the outer side of the buffer tube 14, and the buffer shell 16 can be used for elastically stretching and contracting the buffer tube 14 so as to ensure that the buffer tube 14 has a limited expansion stroke; the two end surfaces of the buffer shell 16 can be pressed against the two ends of the buffer tube 14 for limiting so as to limit the maximum elastic expansion amount of the buffer tube 14; the buffer tube 14 is provided with through holes 17 at both end surfaces thereof through which the water supply pipes 13 pass, so that the buffer tube 14 can expand and contract more smoothly.

When the input pressure in the water inlet pipe 8 is reduced, the cooling liquid in the buffer tank 12 is additionally input into the water cooling cavity 2, and the stable water supply of the water cooling cavity 2 is kept; when the water pressure input by the water inlet pipe 8 is too high, the water can be distributed to the buffer tank 12, and the buffer tank 12 and the buffer pipe 14 buffer and absorb the water through pressure relief and buffer, so that the danger that the shell and the pipe wall of the motor burst and the like caused by too high pressure is avoided.

The check valves 10 installed on the water inlet pipe 8 and the water outlet pipe 9 can claim the buffering function of the components such as the buffer tank 12 and the like, so that the cooling liquid can be stably and unidirectionally conveyed in the water cooling cavity 2, and the efficient and stable cooling and heat dissipation of the motor can be realized.

EXAMPLE III

A water-cooled motor, which is based on the second embodiment and is shown in fig. 4-5, will be described with reference to the pressure stabilizing structure between the branch pipe 11 and the buffer tank 12.

A buffer joint 18 is connected between the branch pipe 11 and the buffer tank 12, the pressure between the buffer tank 12 and the water inlet joint 5 can be balanced through the buffer joint 18, and when the pressure on two sides is relatively balanced or the pressure difference is not large, the buffer joint 18 can keep the two sides closed; when the pressure on one side is too high, the buffer joint 18 can be opened, and pressure relief and buffering are realized.

As shown in fig. 4, a baffle plate 19 is fixed in the inner cavity of the buffer joint 18, one end of the buffer joint 18 corresponding to the upper side of the baffle plate 19 is communicated with the water inlet joint 5 through a branch pipe 11, and one end corresponding to the lower side of the baffle plate 19 is communicated with the buffer tank 12 through the branch pipe 11, so that the baffle plate 19 can separate the two end positions where the buffer joint 18 is connected.

The baffle 19 is fixedly connected with a buffer cylinder 20, the buffer cylinder 20 penetrates through the upper side and the lower side of the baffle 19, the side wall of the buffer cylinder 20 is hollow to form a hollow annular cavity 22, the upper end and the lower end of the annular cavity 22 are respectively provided with a connecting hole I23 and a connecting hole II 24, and the upper side chamber and the lower side chamber of the baffle 19 are communicated through the connecting hole I23 and the connecting hole II 24, so that the circulation of buffered cooling liquid is realized;

an outer restrictor ring 25 and an inner restrictor ring 26 are arranged in the annular chamber 22, which are fitted to one another, wherein the inner restrictor ring 26 is sealingly fitted to the inner wall of the annular chamber 22 and is axially slidably adjustable. The outer flow restricting sleeve is larger in diameter and longer, is sleeved on the periphery of the inner flow restricting sleeve, and is fixedly connected between the outer flow restricting ring 25 and the inner flow restricting ring 26 through a flow restricting plate 27, so that synchronous lifting movement of the inner flow restricting ring 26 and the outer flow restricting ring 25 is realized. A sealing ring 31 is arranged on the upper end surface of the annular cavity 22, and in the upward movement process of the outer restrictor ring 25, the upper end annular surface of the outer restrictor ring 25 can be pressed against the sealing ring 31 at the upper end of the annular cavity 22 to form a pressing sealing structure; the first connecting hole 23 is formed in the upper end of the annular cavity 22 at a position corresponding to the inner side of the outer restrictor ring 25, so that a channel between the first connecting hole 23 and the second connecting hole 24 can be cut off under the condition that the outer restrictor ring 25 is pressed against the upper end face, and the buffer joint 18 is disconnected.

The lower side of the restrictor plate 27 is elastically supported by the restrictor spring 28, and the restrictor spring 28 can always provide a pressure to the restrictor plate 27, so that the outer restrictor ring 25 can always be pressed against the upper end face of the annular cavity 22, and a closed state when the pressure is relatively balanced can be maintained.

In order to realize the bidirectional communication of the annular cavity 22, a flow restriction hole 29 penetrating through the upper and lower sides of the flow restriction plate 27 may be provided, an elastic baffle 30 may be covered on the upper side of the flow restriction hole 29, the elastic baffle 30 may be made of an annular rubber material, the inner periphery of the elastic baffle 30 is fixed to the inner ring of the flow restriction plate 27, and the outer periphery is pressed against and covered on the flow restriction hole 29 to seal the flow restriction hole 29. Because the elastic baffle 30 has certain elasticity, when the elastic baffle 30 is subjected to a large pressure in the direction from the first connecting hole 23, the elastic baffle 30 can stably cover the flow limiting hole 29 to seal the flow limiting hole 29; when the coolant is subjected to the action of large pressure in the direction from the second connecting hole 24, the elastic blocking piece 30 is elastically upwarped due to the pressure of the coolant, and the space between the elastic blocking piece 30 and the flow limiting hole 29 is opened, so that the channel of the second connecting hole 24 facing to the first connecting hole 23 can be opened, and the communication of the coolant channel is realized.

By providing a bi-directional valve structure in the annular chamber 22, the pressure at both ends of the cushion joint 18 can be maintained stable, and stable operation under a steady state can be maintained; and when the pressure on any side fluctuates, the pressure can be buffered, and the conveying stability of the cooling liquid is kept. By adopting the bidirectional different valve structures, different conduction pressure difference conditions can be formed, so that the valve can meet more use environment requirements.

Example four

A water-cooled motor, which is explained in detail with reference to fig. 6 and 7 on the basis of the third embodiment; on the basis of the third embodiment, the buffer joint 18 in the water flow water-cooled motor system is further optimized, so that the reliability of the cooling liquid buffer is further improved.

A supporting block 32 is arranged at the lower side in the annular cavity 22, the supporting block 32 is annular and can be adjusted up and down, and two ends of an adjusting spring 48 in the annular cavity 22 are respectively pressed between the flow limiting plate 27 and the supporting block 32 to maintain the outer flow limiting ring 25 to be capable of being pressed with the sealing ring 31 at the upper end in a sealing manner; during operation, by adjusting the height of the supporting block 32, the amount of compression formed by the adjusting spring 48 will be correspondingly changed, so as to change the pressure of the adjusting spring 48 maintaining the outer restrictor ring 25 at a constant pressure, and adjust the pressure difference when the annular chamber 22 is opened from top to bottom.

A second connecting hole 24 at the lower side of the annular cavity 22 is formed in the side wall of the inner side of the annular cavity 22; and the inner side of the supporting block 32 is connected with a connecting frame 34, the other end of the connecting frame 34 passes through the second connecting hole and is fixed with a lifting block 33. A piston device 21 is installed at an intermediate position inside the buffer cylinder 20, and the height of the adjusting lifter 33, and thus the height of the supporting block 32 and the compression of the spring 48 can be adjusted by the piston device 21.

The piston device 21 can adopt various forms, for example, an electric or pneumatic telescopic cylinder body, namely, the piston device can be actively adjusted by external power; alternatively, as shown in fig. 6, the piston device 21 may have a hollow piston cavity 35, the piston cavity 35 extends vertically, a piston block 36 capable of moving vertically is connected to the piston in the piston cavity 35, and a gap of the piston cavity 35 is filled with a damping medium having a certain pressure, such as damping oil or gas, so as to achieve a certain damping stabilizing effect in a closed space.

The lower end of the piston block 36 is fixedly connected with a piston rod 37, the lower end of the piston rod 37 penetrates through the lower side wall of the piston device 21 and is fixedly connected with the lifting block 33, and the periphery of the piston rod 37 and the piston device 21 are mutually sealed through a sliding sealing piece, so that the lifting block 33 and the supporting block 32 in the annular cavity 22 can be driven to synchronously lift through the lifting of the piston block 36.

A piston hole 38 is formed in the upper end of the piston device 21, a piston column 39 is connected to the piston in the piston hole 38, one end of the piston column 39 extends out of the piston device 21, and the other end of the piston column 39 extends into the piston cavity 35 and is connected with a sealing block 40; the sealing block 40 can be pushed to be pressed against the upper end face of the sealing cavity under the action of high pressure in the piston device 21;

in order to realize that the piston block 36 can smoothly realize up-and-down adjustment, a connecting channel 41 for communicating the upper cavity and the lower cavity of the piston block 36 is arranged on the side wall of the piston device 21, a first connecting port 42 and a second connecting port 43 are respectively arranged at the upper end and the lower end of the connecting channel 41, and the first connecting port 42 extends to the lower side of the inner periphery of the piston hole 38 and is sealed by a sealing block 40; the second connection port 43 extends to the lowermost end of the piston chamber 35. Therefore, the piston post 39 is pressed at the upper end of the piston post 39, so that the sealing block 40 can be driven to move, the first connecting port 42 at the upper end of the connecting channel 41 is opened, the pressure balance of the chambers at the two sides of the piston block 36 can be kept, the buffer medium can normally circulate, and the piston block 36 can smoothly ascend and descend.

In order to be able to press and adjust the piston post 39, an adjusting device may be connected to the cushion joint 18 above the stop plate 19, and by means of the action of the adjusting device, the piston post 39 may be driven and pressed, so that the gasket may be moved downward.

The adjusting device can be in various forms, for example, a pneumatic or electric cylinder can be adopted, the adjusting rod 46 is driven by external power, and the piston is pressed and adjusted by a pressing block 47 on the adjusting rod 46. Or the structure in fig. 7 can be adopted for implementation, and the adjusting device specifically comprises an adjusting tube 44, an adjusting piston 45 and an adjusting rod 46, wherein one end of the adjusting tube 44 is communicated with the inner cavity of the buffer joint 18, and the piston in the adjusting tube 44 is connected with the adjusting piston 45, so that the adjusting piston 45 can realize piston movement in the adjusting tube 44 and can keep a sealed state in the moving process;

one side of the adjusting piston 45 facing the buffer joint 18 is fixedly connected with an adjusting rod 46, the adjusting rod 46 extends into the buffer joint 18, a press block 47 is fixed on the adjusting rod 46, the moving path of the press block 47 is perpendicular to the moving path of the piston post 39, an inclined plane 47 can be arranged on the lower side of the press block 47, and an adaptive inclined plane 47 is also formed on the upper side of the piston post 39, so that the press block 47 and the piston post 39 can form adaptive guide movement, and the piston post 39 can generate a downward pressing component force in the extension and retraction process of the adjusting rod 46; in order to maintain the stability of the pressing block 47 and the adjusting rod 46, the pressing block 47 is fixedly connected to the adjusting rod 46 at a middle position, one end of the adjusting rod 46 is fixedly connected with the adjusting piston 45, and the other end is slidably supported by a guide cylinder 53 in the buffering connector 18.

The two ends in the adjusting pipe 44 are respectively provided with a bulge 52 for limiting the stroke of the adjusting piston 45, and one side of the adjusting piston 45, which is back to the buffer joint 18, is elastically supported through adjusting buffer, and the buffer spring can push the adjusting piston 45 to be pressed towards the buffer joint 18, so that the stability of the adjusting piston 45 is kept.

When the upper chamber of the buffer joint 18 generates high pressure, i.e. high pressure is generated at the water inlet 4 of the cooling chamber, the pressure of the cooling liquid will push the adjusting piston 45 to move towards the outer end, overcoming a certain pressure of the adjusting spring 48, and the valve structure in the annular chamber 22 will also be depressurized.

When the pressure of the water inlet 4 of the cooling cavity is too high and pressure needs to be relieved more quickly, the pressure of the cooling liquid directly pushes the adjusting piston 45 and drives the adjusting rod 46 and the pressing block 47 to relatively press the piston column 39, and the sealing gasket opens the connecting channel 41, so that the media on the upper side and the lower side of the piston block 36 can be communicated, and the pressure is balanced; the internal pressure of piston chamber 35 and adjusting spring 48's pressure will drive piston rod 37, elevator 33 and supporting shoe 32 synchronous decline to can locking adjusting spring 48 correspond the pressure of outer current limiting sleeve to a certain extent, make connecting hole 23 direction can change and open, so that the effect of pressure release protection is played in faster pressure release.

Further, an adjusting block 49 is installed in one end of the adjusting pipe 44, which is opposite to the buffer joint 18, the adjusting spring 48 elastically presses between the adjusting piston 45 and the adjusting block 49, and the adjusting block 49 can be adjusted along the length direction of the adjusting pipe 44, so that the initial compression condition of the adjusting spring 48 is adjusted to a certain degree; and fixedly connected with screw rod 50 on adjusting block 49, the screw hole 51 has been seted up to the end of adjusting pipe 44, and this screw rod 50 passes screw hole 51 and stretches out outside adjusting pipe 44 to can with screw hole 51 screw thread adaptation, thereby can adjust adjusting block 49's position through adjusting screw rod 50, with the pressure release requirement of adaptation different pressure differentials, thereby have better environmental suitability.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the utility model may occur to those skilled in the art without departing from the principle of the utility model, and are considered to be within the scope of the utility model.

Claims (7)

1. A water-cooled motor is characterized by comprising an end cover internally provided with a water-cooled cavity, wherein the water-cooled cavity is connected with a water inlet and a water outlet, the water inlet is connected with a water inlet pipe through a water inlet joint, the water outlet is connected with a water outlet pipe through a water outlet joint, the water inlet pipe and the water outlet pipe are both connected with a one-way valve, and the one-way valve is used for one-way conduction from the water inlet to the water outlet; the water cooling cavity is annular around the motor, and the inside upside in water cooling cavity sets up the division board, and water inlet and delivery port distribute in the both sides of division board.

2. The water-cooled motor as claimed in claim 1, wherein a conduit is connected to the inside of the water outlet joint, and the conduit extends into the water outlet and extends to the middle upper part of the water-cooled cavity.

3. The water-cooled motor according to claim 1, wherein the water inlet joint is connected with a branch pipe, the other end of the branch pipe is connected with a buffer tank, and the buffer tank is used for buffering cooling liquid.

4. The water-cooled motor of claim 3, wherein a water replenishing pipe is connected to the lower part of the buffer tank, and the water replenishing pipe is connected with a cooling water source through a booster pump.

5. The water-cooled motor of claim 4, wherein a buffer tube is connected to the water supply pipe between the booster pump and the buffer pipe.

6. The water-cooled motor as recited in claim 5, wherein the buffer tube is an elastically stretchable bellows tube.

7. The water-cooled motor as claimed in claim 6, wherein a buffer shell is arranged outside the buffer tube, the buffer tube is elastically stretched and retracted in the buffer shell, and two end faces of the buffer shell are used for abutting against two ends of the buffer tube for limiting so as to limit the maximum elastic expansion amount of the buffer tube; and through holes for the water supply pipes to pass through are formed in two end faces of the buffer pipe.

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