Water cooling system inside motor stator

Abstract

The application relates to the field of motor heat dissipation, in particular to a water cooling system in a motor stator, which comprises a shell and a stator, the shell is provided with a containing cavity, the stator is fixedly connected to the inner wall of the containing cavity, the stator is provided with a through port, the axis of the through port is parallel to the axis of the stator, the through port penetrates through the stator, and the through port is used for passing in cooling liquid. The cooling liquid passes through the through port and fully contacts the stator in a high-temperature state to exchange energy, the heat transfer path is greatly shortened, the overall heat exchange coefficient is improved, and the heat dissipation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of motor heat dissipation, and particularly relates to a motor stator internal water cooling system. BACKGROUND

[0002] A motor generates a large amount of heat during operation, and if the heat is not dissipated in time and effectively, the working efficiency and service life of the motor are affected.

[0003] At present, common motor cooling technologies on the market mainly include air cooling and oil cooling. The air cooling is to set a fan or a flow guide device outside the motor to increase the air flow speed, thereby taking away the heat generated by the motor. The oil cooling is to realize liquid cooling through a cooling channel in the motor shell.

[0004] Both of the two cooling methods achieve the cooling function of the motor to a certain extent, but due to the long heat dissipation path and many intermediate links, the cooling efficiency is not high, especially in the case of high heat density, it is difficult to achieve ideal temperature control effect. SUMMARY

[0005] In order to improve the heat dissipation efficiency, the present application provides a motor stator internal water cooling system.

[0006] The motor stator internal water cooling system provided by the present application adopts the following technical scheme:

[0007] A motor stator internal water cooling system, comprising a shell and a stator, the shell is provided with a containing cavity, the stator is fixedly connected to the inner wall of the containing cavity, the stator is provided with a through port, the axis of the through port is parallel to the axis of the stator, the through port penetrates the stator, and the through port is used for passing in cooling liquid.

[0008] By adopting the above technical scheme, the cooling liquid passes through the through port and fully contacts the stator in a high temperature state to exchange energy, greatly shortens the heat transfer path, improves the overall heat transfer coefficient, and improves the heat dissipation efficiency.

[0009] Preferably, the through port is provided with a plurality of through ports, and the plurality of through ports are uniformly and interval arranged around the axis of the stator.

[0010] By adopting the above technical scheme, the cooling liquid flows in the plurality of through ports, fully exchanges heat with the stator, and improves the heat dissipation efficiency.

[0011] Preferably, the first connecting ring and the second connecting ring are fixedly connected to two ends of the stator respectively, a first ring groove is coaxially arranged at one end of the stator towards the first connecting ring, a second ring groove is coaxially arranged at one end of the stator towards the second connecting ring, the first ring groove and the second ring groove are communicated with the through holes, an outer wall of the first connecting ring is provided with a first through hole, and an outer wall of the second connecting ring is provided with a second through hole.

[0012] By adopting the above technical scheme, the cooling liquid enters or exits the first ring groove and the second ring groove from the first through hole or the second through hole, the first ring groove and the second ring groove are communicated with the plurality of through holes, the cooling liquid is conveniently introduced into the plurality of through holes, the pipeline is reduced, and material waste is reduced.

[0013] Preferably, the shell is provided with a liquid inlet and a liquid outlet, a liquid inlet pipe is coaxially fixedly connected to the inner wall of the first through hole through the liquid inlet, a liquid outlet pipe is coaxially fixedly connected to the inner wall of the second through hole through the liquid outlet, and the height of the second through hole is greater than the height of the first through hole.

[0014] By adopting the above technical scheme, the cooling liquid enters the first through hole from the liquid inlet pipe, passes through the first ring groove to enter the plurality of through holes and the second ring groove, and is finally discharged from the liquid outlet pipe through the second through hole, the height of the second through hole is greater than the height of the first through hole, the cooling liquid with a higher temperature at the top is conveniently discharged first, and the heat dissipation efficiency is improved.

[0015] Preferably, the stator is provided with a winding hole, the winding hole is arranged at the inner periphery of the through hole, a blocking ring is arranged between the through hole and the winding hole, both ends of the stator are coaxially fixedly connected to the blocking ring, the distance from the blocking ring to the stator is greater than the distance from the first connecting ring to the stator, and the distance from the blocking ring to the stator is greater than the distance from the second connecting ring to the stator.

[0016] By adopting the above technical scheme, if the cooling liquid leaks from the joint between the first connecting ring and the stator or from the joint between the second connecting ring and the stator, the blocking ring separates the cooling liquid from the winding hole, reduces the contact between the cooling liquid and the wire harness in the winding hole, reduces the short circuit, and prolongs the service life of the motor.

[0017] Preferably, the accommodating cavity is provided with a water receiving groove on the upward inner wall, the water receiving groove is used for receiving the cooling liquid leaked from the stator, and a water absorption expansion block is embedded in the water receiving groove.

[0018] By adopting the above technical scheme, the cooling liquid is collected in the water receiving groove, the water absorption expansion block absorbs the cooling liquid, the water stains in the accommodating cavity are reduced, the probability of wire harness short circuit is reduced, and the service life of the equipment is prolonged.

[0019] Preferably, the water absorption expansion block abuts against the outer wall of the stator.

[0020] By adopting the technical scheme, if the stator outer wall leaks cooling liquid, the water absorption expansion block absorbs the cooling liquid, if the stator downward outer wall leaks water, the water absorption expansion block blocks the stator downward outer wall, reduces the leakage of the cooling liquid, and prolongs the service life of the equipment.

[0021] Preferably, the first stop valve comprises a first valve body, a first valve rod, a first valve flap and a first spring, the tank bottom of the water collecting tank is communicated with the liquid inlet, the first valve body is connected with the liquid inlet pipe, the first valve body is arranged in the water collecting tank, one end of the first valve body towards the water absorption expansion block is provided with a sliding opening, the first valve rod is slidingly connected with the inner wall of the sliding opening, the first valve flap is arranged in the first valve body, the first valve flap is fixedly connected with the first valve rod, the first valve flap is used for controlling the opening and closing of the liquid inlet pipe, the end of the first valve rod away from the first valve flap is used for abutting against the water absorption expansion block, the first spring is sleeved on the outer periphery of the first valve rod, one end of the first spring is fixedly connected with the outer wall of the first valve body, and the other end of the first spring is fixedly connected with the first valve rod.

[0022] By adopting the technical scheme, if the stator leaks liquid, the cooling liquid is collected in the water collecting tank, the water absorption expansion block absorbs water and expands to elongate, the water absorption expansion block abuts against the first valve rod to compress the first spring, the first valve flap blocks the liquid inlet pipe, and liquid cannot continue to flow in, thereby reducing the waste of the cooling liquid.

[0023] Preferably, the second stop valve comprises a second valve body, a second valve rod, a second valve flap, a connecting rod and a second spring, the outer wall of the second connecting ring is provided with a third communication opening, the height of the third communication opening is less than or equal to the height of the first communication opening, the shell is provided with a drain port, the drain port is communicated with the tank bottom of the water collecting tank, the drain port and the liquid inlet port are arranged on the two sides of the water absorption expansion block, the drain pipe is coaxially fixedly connected with the inner wall of the third communication opening after penetrating through the drain port, the second valve body is connected with the drain pipe, the second valve body is arranged in the water collecting tank, one end of the second valve body away from the water absorption expansion block is provided with a sliding opening, the second valve rod is slidingly connected with the inner wall of the sliding opening, the second valve flap is arranged in the second valve body, the second valve flap is fixedly connected with the second valve rod, the second valve flap is used for controlling the opening and closing of the drain pipe, the end of the second valve rod away from the second valve flap is fixedly connected with one end of the connecting rod, the other end of the connecting rod is arranged on one side of the second valve body close to the water absorption expansion block, the connecting rod is used for abutting against the water absorption expansion block, the second spring is sleeved on the outer periphery of the second valve rod, one end of the second spring is fixedly connected with the outer wall of the second valve body, and the other end of the second spring is fixedly connected with the second valve rod.

[0024] By adopting the technical scheme, the water-absorbing expansion block expands to abut against the connecting rod, the second valve rod slides against the elastic force of the second spring, the second spring is elongated, the second valve disc is moved to make the liquid discharge pipe communicate, the cooling liquid in the stator is discharged, the probability of motor short circuit is reduced, the service life of the motor is prolonged, and the cooling liquid discharge reminds the operator to overhaul.

[0025] Preferably, the shell is provided with a rotor, a rotating shaft and a fan blade, both ends of the shell are provided with rotating ports, the rotating ports are communicated with the accommodating cavity, the rotor is fixedly connected to the outer wall of the rotating shaft in a coaxial manner, the rotor rotates coaxially in the inner periphery of the stator, the rotating shaft is connected to the inner wall of the rotating port in a coaxial manner, both ends of the shell are provided with ventilation ports, the ventilation ports are arranged on the outer periphery of the rotating port, the ventilation ports are communicated with the accommodating cavity, and the fan blade is arranged on the outer periphery of the shell.

[0026] By adopting the technical scheme, the rotating shaft drives the fan blade to rotate, the air flow in the accommodating cavity is accelerated, the heat dissipation efficiency is improved, if the cooling liquid leaks, the air drying is facilitated, and the service life of the motor is prolonged.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The cooling liquid passes through the port and fully contacts the stator in a high-temperature state to exchange energy, greatly shortens the heat transfer path, improves the overall heat transfer coefficient, and improves the heat dissipation efficiency;

[0029] 2. The cooling liquid is collected in the water collecting groove, the water-absorbing expansion block absorbs the cooling liquid, the water stains in the accommodating cavity are reduced, the probability of wire harness short circuit is reduced, and the service life of the equipment is prolonged;

[0030] 3. The water-absorbing expansion block expands to abut against the connecting rod, the second valve rod slides against the elastic force of the second spring, the second spring is elongated, the second valve disc is moved to make the liquid discharge pipe communicate, the cooling liquid in the stator is discharged, the probability of motor short circuit is reduced, the service life of the motor is prolonged, and the cooling liquid discharge reminds the operator to overhaul. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a whole structure schematic diagram of a motor stator internal water cooling system.

[0032] Figure 2 It is an internal structure schematic diagram of a motor stator internal water cooling system after being cut open.

[0033] Figure 3 It is Figure 2 An enlarged view of A in FIG. 1.

[0034] Figure 4 It is Figure 2 An enlarged view of B in FIG. 1.

[0035] Explanation of reference signs: 1, shell; 11, main body; 111, liquid inlet; 112, drain port; 113, liquid outlet; 12, seat body; 13, end cover; 131, rotating port; 132, ventilation port; 14, accommodating cavity; 141, water receiving groove; 2, stator; 21, winding port; 22, through port; 3, rotor; 4, rotating shaft; 5, bearing; 6, air cooling assembly; 61, dustproof net; 62, fan blade; 63, cover; 631, mounting groove; 632, isolation port; 7, water cooling assembly; 71, first connecting ring; 711, first ring groove; 712, first communication port; 72, second connecting ring; 721, second ring groove; 722, second communication port; 723, third communication port; 73, blocking ring; 731, flange; 74, water absorption expansion block; 75, liquid outlet pipe; 76, liquid inlet pipe; 77, liquid discharge pipe; 78, first stop valve; 781, first valve body; 7811, sliding port; 7812, water passing port; 782, first valve rod; 783, first valve flap; 784, first spring; 79, second stop valve; 791, second valve body; 7911, sliding port; 7912, on-off port; 792, second valve rod; 793, second valve flap; 794, connecting rod; 795, second spring. DETAILED DESCRIPTION

[0036] The following will be described in detail with reference to the accompanying drawings. Figures 1-4 The present application is further described in detail.

[0037] The present application discloses a motor stator internal water cooling system. Referring to Figure 1 and Figure 2 A motor stator internal water cooling system comprises a shell 1, a stator 2, a rotor 3, a rotating shaft 4, a bearing 5, an air cooling assembly 6 and a water cooling assembly 7.

[0038] Referring to Figure 2 The shell 1 comprises a main body 11, a seat body 12 and an end cover 13, the seat body 12 is fixedly connected to the lower end of the main body 11, the seat body 12 is provided in two, the two seat bodies 12 are arranged along the width direction of the main body 11, the two seat bodies 12 improve the stability of the shell 1, the end cover 13 is provided in two, the two end covers 13 are fixedly connected to the two ends of the main body 11 by bolts respectively, and the main body 11 and the two end covers 13 enclose the accommodating cavity 14.

[0039] The stator 2 is fixedly connected to the inner wall of the accommodating cavity 14, the end cover 13 is provided with a rotating port 131, the rotating port 131 is communicated with the accommodating cavity 14, the rotor 3 is fixedly connected to the outer wall of the rotating shaft 4 coaxially, the rotor 3 rotates coaxially in the inner periphery of the stator 2, the outer wall of the rotating shaft 4 is fixedly connected to the inner wall of the bearing 5 coaxially, the outer wall of the bearing 5 is fixedly connected to the inner wall of the rotating port 131 coaxially, and the bearing 5 is provided in two, the bearing 5 is arranged in one-to-one correspondence with the rotating port 131.

[0040] Referring toFigure 2 The air-cooling assembly 6 comprises a dustproof screen 61, a fan blade 62 and a cover 63. The end cover 13 is provided with air vents 132 arranged on the outer periphery of the rotating port 131. The air vents 132 are communicated with the accommodating cavity 14. The air vents 132 are provided in plurality and are uniformly and spacedly arranged around the axis of the rotating port 131. The dustproof screen 61 is coaxially and fixedly connected to the inner wall of the air vents 132 and is used to prevent impurities from entering the accommodating cavity 14. The fan blade 62 is arranged on the outer periphery of the shell 1 and is fixedly connected to the outer wall of the rotating shaft 4. One end of the cover 63 is provided with a mounting groove 631, the groove wall of which is fixedly connected to the outer wall of the main body 11. One end cover 13 and the fan blade 62 are arranged in the mounting groove 631. The outer wall of the cover 63 is provided with isolation ports 632 which are communicated with the mounting groove 631. The isolation ports 632 are provided in plurality.

[0041] The water-cooling assembly 7 comprises a first connecting ring 71, a second connecting ring 72, a blocking ring 73, a water-absorbing expansion block 74, a liquid outlet pipe 75, a liquid inlet pipe 76, a liquid discharge pipe 77, a first stop valve 78 and a second stop valve 79. The stator 2 is provided with a wire winding port 21 for wire winding. The stator 2 is provided with through ports 22 arranged on the outer periphery of the wire winding port 21. The axis of the through ports 22 is parallel to the axis of the stator 2. The through ports 22 penetrate the stator 2 and are used to pass in cooling liquid. The through ports 22 are provided in plurality and are uniformly and spacedly arranged around the axis of the stator 2.

[0042] With reference to Figure 2 The first connecting ring 71 and the second connecting ring 72 are fixedly connected to the two ends of the stator 2 respectively. The first connecting ring 71 is arranged on the side of the second connecting ring 72 away from the fan blade 62. The first connecting ring 71 is coaxially provided with a first ring groove 711 at the end thereof facing the stator 2. The second connecting ring 72 is coaxially provided with a second ring groove 721 at the end thereof facing the stator 2. The first ring groove 711 and the second ring groove 721 are communicated with the through ports 22. The outer wall of the first connecting ring 71 is provided with a first communication port 712 communicated with the first ring groove 711. The outer wall of the second connecting ring 72 is provided with a second communication port 722 and a third communication port 723 communicated with the second ring groove 721. The height of the second communication port 722 is greater than the height of the first communication port 712. The height of the third communication port 723 is equal to the height of the first communication port 712. The first communication port 712 is arranged close to the bottom wall of the accommodating cavity 14. The second communication port 722 is arranged close to the top wall of the accommodating cavity 14.

[0043] The blocking ring 73 is arranged between the through hole 22 and the winding hole 21, and is provided with the inner periphery of the first connecting ring 71 and the second connecting ring 72. The blocking ring 73 is provided with two, and the two ends of the stator 2 are coaxially fixedly connected to the blocking ring 73. The distance from the blocking ring 73 to the stator 2 is greater than the distance from the first connecting ring 71 to the stator 2, and the distance from the blocking ring 73 to the stator 2 is greater than the distance from the second connecting ring 72 to the stator 2. The end of the blocking ring 73 away from the stator 2 extends in the direction away from the axis of the stator 2 to form a flange 731, reducing the probability of contact between the cooling liquid and the wire harness.

[0044] With reference to Figure 2 , the inner wall of the accommodating cavity 14 facing upward is provided with a water receiving groove 141 for receiving the cooling liquid leaked from the stator 2. The water absorbing expansion block 74 is embedded in the water receiving groove 141 and abuts against the outer wall of the stator 2 facing downward. The lower end of the main body 11 is provided with a liquid inlet 111 and a drain 112, and the upper end of the main body 11 is provided with a liquid outlet 113. The liquid inlet 111, the drain 112 and the liquid outlet 113 are all communicated with the accommodating cavity 14. The liquid outlet 113 is arranged between the second connecting ring 72 and the end cover 13, and the outlet pipe 75 is coaxially fixedly connected to the inner wall of the second connecting port 722 through the liquid outlet 113.

[0045] The liquid inlet 111 and the drain 112 are both communicated with the groove bottom of the water receiving groove 141. The liquid inlet 111 and the drain 112 are arranged on both sides of the water absorbing expansion block 74. The liquid inlet 111 is arranged on the side away from the fan blade 62 of the drain 112. The liquid inlet pipe 76 is coaxially fixedly connected to the inner wall of the first connecting port 712 after passing through the liquid inlet 111, and the drain pipe 77 is coaxially fixedly connected to the inner wall of the third connecting port 723 after passing through the drain 112. The outer wall of the liquid inlet pipe 76 is attached to the inner wall of the liquid inlet 111, and the outer wall of the drain pipe 77 is attached to the inner wall of the drain 112. The height of the groove bottom of the water receiving groove 141 increases away from the water absorbing expansion block 74.

[0046] With reference to Figure 2 and Figure 3The first stop valve 78 comprises a first valve body 781, a first valve rod 782, a first valve disc 783 and a first spring 784. The first valve body 781 is connected to the liquid inlet pipe 76 and arranged in the water collecting groove 141. The first valve body 781 is provided with a sliding opening 7811 at one end facing the water absorbing and expanding block 74. The first valve rod 782 is slidingly connected to the inner wall of the sliding opening 7811 and slides in parallel to the length direction of the water collecting groove 141. The first valve body 781 is provided with a water passing opening 7812. The first valve disc 783 is arranged in the first valve body 781 and fixedly connected to one end of the first valve rod 782. The first valve disc 783 is used for plugging the water passing opening 7812 to control the opening and closing of the liquid inlet pipe 76. The end of the first valve rod 782 away from the first valve disc 783 is used for abutting against the water absorbing and expanding block 74. The first spring 784 is sleeved on the outer periphery of the first valve rod 782. One end of the first spring 784 is fixedly connected to the outer wall of the first valve body 781 and the other end is fixedly connected to the outer wall of the first valve rod 782. When the first spring 784 is not stressed, the first valve disc 783 is away from the water passing opening 7812 and the liquid inlet pipe 76 is connected.

[0047] With reference to Figure 2 and Figure 4 The second stop valve 79 comprises a second valve body 791, a second valve rod 792, a second valve disc 793, a connecting rod 794 and a second spring 795. The second valve body 791 is connected to the liquid outlet pipe 77 and arranged in the water collecting groove 141. The second valve body 791 is provided with a sliding opening 7911 at one end away from the water absorbing and expanding block 74. The second valve rod 792 is slidingly connected to the inner wall of the sliding opening 7911 and slides in parallel to the length direction of the water collecting groove 141. The second valve body 791 is provided with a water passing opening 7912. The second valve disc 793 is arranged in the second valve body 791 and fixedly connected to one end of the second valve rod 792. The second valve disc 783 is used for plugging the water passing opening 7912 to control the opening and closing of the liquid outlet pipe 77. The end of the second valve rod 792 away from the second valve disc 793 is fixedly connected to one end of the connecting rod 794. The other end of the connecting rod 794 is arranged on one side of the second valve body 791 close to the water absorbing and expanding block 74. The connecting rod 794 is used for abutting against the water absorbing and expanding block 74. The second spring 795 is sleeved on the outer periphery of the second valve rod 792. One end of the second spring 795 is fixedly connected to the outer wall of the second valve body 791 and the other end is fixedly connected to the second valve rod 792. When the second spring 795 is not stressed, the second valve disc 793 plugs the water passing opening 7912 and the liquid outlet pipe 77 is not connected.

[0048] With reference to Figure 3 and Figure 4 The elastic force of the second spring 795 is greater than that of the first spring 784.

[0049] The implementation principle of the motor stator internal water cooling system of the embodiment of the application is as follows: the rotation of the rotating shaft 4 drives the rotation of the fan blade 62, so that the air is accelerated to flow in the containing cavity 14 through the air vent 132 to perform air cooling heat dissipation; the cooling liquid is fed into the liquid inlet pipe 76; the cooling liquid cools the stator 2 through the first ring groove 711, the through hole 22 and the second ring groove 721; the cooling liquid is discharged from the liquid outlet pipe 75; the cooling liquid is continuously fed to take away the heat of the stator 2 to realize water cooling heat dissipation; if the stator 2 leaks, the temperature inside the stator 2 is relatively high, and the air cooling cooperates to make the cooling liquid vaporize, so that the probability of wire harness short circuit is reduced; if the leakage is relatively large, the liquid enters the water collecting groove 141, the water absorption expansion block 74 expands, the first stop valve 78 is closed first, the second stop valve 79 is opened again, the cooling liquid in the stator 2 is quickly discharged, the operator is reminded to overhaul, the air cooling heat dissipation takes away the water vapor in the containing cavity 14 at the same time, and the service life of the motor is prolonged.

[0050] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so that: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A water-cooling system for the stator of an electric motor, characterized in that: The device includes a housing (1) and a stator (2). The housing (1) has a receiving cavity (14). The stator (2) is fixedly connected to the inner wall of the receiving cavity (14). The stator (2) has a through-hole (22). The axis of the through-hole (22) is parallel to the axis of the stator (2). The through-hole (22) penetrates the stator (2) and is used to introduce coolant. The port (22) is provided in multiple ways, and the multiple ports (22) are evenly spaced around the axis of the stator (2); It also includes a first connecting ring (71) and a second connecting ring (72), which are respectively fixedly connected to the two ends of the stator (2). The first connecting ring (71) has a first annular groove (711) coaxially provided at the end facing the stator (2), and the second connecting ring (72) has a second annular groove (721) coaxially provided at the end facing the stator (2). The first annular groove (711) and the second annular groove (721) are both connected to the through port (22). The outer wall of the first connecting ring (71) has a first connecting port (712), and the outer wall of the second connecting ring (72) has a second connecting port (722). It also includes an inlet pipe (76) and an outlet pipe (75). The outer wall of the housing (1) is provided with an inlet port (111) and an outlet port (113). The inlet pipe (76) passes through the inlet port (111) and is coaxially fixedly connected to the inner wall of the first connecting port (712). The outlet pipe (75) passes through the outlet port (113) and is coaxially fixedly connected to the inner wall of the second connecting port (722). The height of the second connecting port (722) is greater than the height of the first connecting port (712). It also includes a retaining ring (73), the stator (2) is provided with a winding port (21), the winding port (21) is located on the inner circumference of the through port (22), the retaining ring (73) is located between the through port (22) and the winding port (21), both ends of the stator (2) are coaxially fixedly connected to the retaining ring (73), the distance from the retaining ring (73) to the stator (2) is greater than the distance from the first connecting ring (71) to the stator (2), and the distance from the retaining ring (73) to the stator (2) is greater than the distance from the second connecting ring (72) to the stator (2); It also includes a water-absorbing expansion block (74), and the inner wall of the cavity (14) facing upward is provided with a water receiving groove (141). The water receiving groove (141) is used to receive the coolant leaking from the stator (2), and the water-absorbing expansion block (74) is embedded in the water receiving groove (141). It also includes a first shut-off valve (78), which includes a first valve body (781), a first valve stem (782), a first valve disc (783), and a first spring (784). The bottom of the water receiving tank (141) is connected to the liquid inlet (111). The first valve body (781) is connected to the liquid inlet pipe (76). The first valve body (781) is located in the water receiving tank (141). The end of the first valve body (781) facing the water absorption expansion block (74) is provided with a sliding port (7811). The first valve stem (782) is slidably connected to the inner wall of the sliding port (7811). The first valve disc (783) is located inside the first valve body (781). The first valve disc (783) is fixedly connected to the first valve stem (782). The first valve disc (783) is used to control the opening and closing of the liquid inlet pipe (76). The end of the first valve stem (782) away from the first valve disc (783) is used to abut against the water absorption expansion block (74). The first spring (784) is sleeved on the outer periphery of the first valve stem (782). One end of the first spring (784) is fixedly connected to the outer wall of the first valve body (781), and the other end of the first spring (784) is fixedly connected to the first valve stem (782).

2. The internal water cooling system for a motor stator according to claim 1, characterized in that: The water-absorbing expansion block (74) abuts against the outer wall of the stator (2).

3. The internal water cooling system for a motor stator according to claim 1, characterized in that: It also includes a drain pipe (77) and a second shut-off valve (79). The outer wall of the second connecting ring (72) is provided with a third connecting port (723). The height of the third connecting port (723) is less than or equal to the height of the first connecting port (712). The housing (1) is provided with a drain port (112). The drain port (112) is connected to the bottom of the water receiving tank (141). The drain port (112) and the liquid inlet (111) are respectively located on both sides of the water absorption expansion block (74). The drain pipe (77) passes through the drain outlet (112) and is coaxially fixed to the inner wall of the third connecting port (723). The second shut-off valve (79) includes a second valve body (791), a second valve stem (792), a second valve disc (793), a connecting rod (794), and a second spring (795). The second valve body (791) is connected to the drain pipe (77) and is located in the water receiving tank (141). The second valve body (791) is away from the suction... One end of the water expansion block (74) is provided with a sliding port (7911). The second valve stem (792) is slidably connected to the inner wall of the sliding port (7911). The second valve disc (793) is located inside the second valve body (791) and is fixedly connected to the second valve stem (792). The second valve disc (793) is used to control the opening and closing of the drain pipe (77). The end of the second valve stem (792) away from the second valve disc (793) is fixedly connected to the connecting rod. One end of the connecting rod (794) is located on the side of the second valve body (791) near the water-absorbing expansion block (74). The connecting rod (794) is used to abut against the water-absorbing expansion block (74). The second spring (795) is sleeved on the outer periphery of the second valve stem (792). One end of the second spring (795) is fixedly connected to the outer wall of the second valve body (791), and the other end of the second spring (795) is fixedly connected to the second valve stem (792).

4. The internal water cooling system for a motor stator according to claim 1, characterized in that: It also includes a rotor (3), a rotating shaft (4) and a fan blade (62). Both ends of the housing (1) are provided with a rotating port (131), which is connected to the receiving cavity (14). The rotor (3) is coaxially fixedly connected to the outer wall of the rotating shaft (4). The rotor (3) rotates coaxially within the stator (2). The rotating shaft (4) is coaxially rotatably connected to the inner wall of the rotating port (131). Both ends of the housing (1) are provided with a ventilation port (132), which is located on the outer periphery of the rotating port (131) and is connected to the receiving cavity (14). The fan blade (62) is located on the outer periphery of the housing (1) and is fixedly connected to the outer wall of the rotating shaft (4).

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