Motor stator internal water cooling system

Abstract

The invention relates to the field of motor heat dissipation, in particular to a motor stator internal water cooling system 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 opening, the axis of the through opening is parallel to the axis of the stator, and the through opening penetrates through the stator. And the through hole is used for introducing cooling liquid. Cooling liquid passes through the through holes and is in full contact with the stator in a high-temperature state to exchange energy, so that a 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 in particular to a water cooling system inside a motor stator. Background Art

[0002] The motor will generate a large amount of heat energy during operation. If the heat is not dissipated effectively and in a timely manner, the working efficiency and service life of the motor will be affected.

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

[0004] Both cooling methods can achieve the cooling function of the motor to a certain extent. However, due to the long heat dissipation path and many intermediate links, the cooling efficiency is not high, especially when dealing with high heat density, it is difficult to achieve the ideal temperature control effect. Summary of the invention

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

[0006] The present application provides a motor stator internal water cooling system adopts the following technical solution: A motor stator internal water cooling system comprises a shell and a stator, wherein 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 opening, the axis of the through opening is parallel to the axis of the stator, the through opening passes through the stator, and the through opening is used to pass cooling liquid.

[0007] By adopting the above technical solution, the coolant passes through the opening and fully contacts with the stator in a high temperature state to exchange energy, which greatly shortens the heat transfer path, improves the overall heat transfer coefficient, and improves the heat dissipation efficiency.

[0008] Preferably, a plurality of the through openings are provided, and the plurality of through openings are evenly spaced around the axis of the stator.

[0009] By adopting the above technical solution, the coolant flows in multiple openings, fully exchanges heat with the stator, and improves the heat dissipation efficiency.

[0010] Preferably, it also includes a first connecting ring and a second connecting ring, the first connecting ring and the second connecting ring are respectively fixedly connected to the two ends of the stator, the first connecting ring is coaxially provided with a first ring groove at one end facing the stator, and the second connecting ring is coaxially provided with a second ring groove at one end facing the stator, the first ring groove and the second ring groove are both connected to the through port, the outer wall of the first connecting ring is provided with a first connecting port, and the outer wall of the second connecting ring is provided with a second connecting port.

[0011] By adopting the above technical solution, the coolant enters and exits the first annular groove and the second annular groove from the first connecting port or the second connecting port. The first annular groove and the second annular groove are both connected to multiple ports, which makes it easy to pass the coolant into multiple ports, reduce pipelines, and reduce material waste.

[0012] Preferably, it also includes a liquid inlet pipe and a liquid outlet pipe, the outer wall of the shell is provided with a liquid inlet and a liquid outlet, the liquid inlet pipe passes through the liquid inlet and is coaxially fixedly connected to the inner wall of the first connecting port, the liquid outlet pipe passes through the liquid outlet and is coaxially fixedly connected to the inner wall of the second connecting port, and the height of the second connecting port is greater than the height of the first connecting port.

[0013] By adopting the above technical solution, the coolant enters the first connecting port from the liquid inlet pipe, enters the multiple ports and the second connecting groove through the first annular groove, and finally is discharged from the liquid outlet pipe through the second connecting port. The height of the second connecting port is greater than that of the first connecting port, so that the coolant with higher temperature above can be discharged first, thereby improving the heat dissipation efficiency.

[0014] Preferably, it also includes a retaining ring, the stator is provided with a winding opening, the winding opening is arranged on the inner periphery of the through opening, the retaining ring is arranged between the through opening and the winding opening, both ends of the stator are coaxially fixedly connected to the retaining ring, the distance from the retaining ring to the stator is greater than the distance from the first connecting ring to the stator, and the distance from the retaining ring to the stator is greater than the distance from the second connecting ring to the stator.

[0015] By adopting the above technical solution, if coolant leaks out from the joint between the first connecting ring and the stator, or if coolant leaks out from the joint between the second connecting ring and the stator, the retaining ring separates the coolant from the winding opening, thereby reducing the contact between the coolant and the wiring harness in the winding opening, reducing short circuits, and extending the service life of the motor.

[0016] Preferably, it further comprises a water absorbing expansion block, the upward inner wall of the accommodating cavity is provided with a water receiving groove, the water receiving groove is used to receive the coolant leaked from the stator, and the water absorbing expansion block is embedded in the water receiving groove.

[0017] By adopting the above technical solution, the coolant is collected in the water receiving tank, and the water-absorbing expansion block absorbs the coolant, thereby reducing water stains in the accommodating cavity, reducing the probability of wiring harness short circuit, and extending the service life of the equipment.

[0018] Preferably, the water-absorbing expansion block abuts against an outer wall of the stator.

[0019] By adopting the above technical solution, if the coolant leaks from the outer wall of the stator, the water-absorbing expansion block absorbs the coolant; if the downward outer wall of the stator leaks, the water-absorbing expansion block blocks the downward outer wall of the stator, thereby reducing coolant leakage and extending the service life of the equipment.

[0020] Preferably, it also includes a first stop valve, which includes a first valve body, a first valve stem, a first valve disc and a first spring. The bottom of the water receiving trough is connected to the liquid inlet, and the first valve body is connected to the liquid inlet pipe. The first valve body is arranged in the water receiving trough, and a sliding opening is provided at one end of the first valve body facing the water absorption and expansion block. The first valve stem is slidably connected to the inner wall of the sliding opening. The first valve disc is arranged in the first valve body, and the first valve disc is fixedly connected to the first valve stem. The first valve disc is used to control the on-off of the liquid inlet pipe, and the end of the first valve stem away from the first valve disc is used to abut the water absorption and expansion block. The first spring is sleeved on the outer periphery of the first valve stem, one end of the first spring is fixedly connected to the outer wall of the first valve body, and the other end of the first spring is fixedly connected to the first valve stem.

[0021] By adopting the above technical solution, if the stator leaks, the coolant collects in the water receiving groove, the water absorption expansion block absorbs water and expands and elongates, the water absorption expansion block abuts against the first valve stem to compress the first spring, and the first valve disc blocks the liquid inlet pipe, and liquid can no longer be inlet, thereby reducing the waste of coolant.

[0022] Preferably, it also includes a drain pipe and a second stop valve, the outer wall of the second connecting ring is provided with a third communication port, the height of the third communication port is less than or equal to the height of the first communication port, the shell is provided with a drain port, the drain port is connected to the bottom of the water receiving tank, the drain port and the liquid inlet are respectively arranged on both sides of the water absorption expansion block, the drain pipe is coaxially fixedly connected to the inner wall of the third communication port after passing through the drain port, the second stop valve includes a second valve body, a second valve stem, a second valve disc, a connecting rod and a second spring, the second valve body is connected to the drain pipe, the second valve body is arranged in the water receiving tank, the second valve body is away from the water absorption expansion block A sliding port is provided at one end of the expansion block, and the second valve stem is slidably connected to the inner wall of the sliding port, the second valve flap is arranged in the second valve body, the second valve flap is fixedly connected to the second valve stem, the second valve flap is used to control the on and off of the discharge pipe, the end of the second valve stem facing away from the second valve flap is fixedly connected to one end of the connecting rod, the other end of the connecting rod is arranged on a side of the second valve body close to the water absorption expansion block, the connecting rod is used to abut the water absorption expansion block, the second spring is sleeved on the outer periphery of the second valve stem, one end of the second spring is fixedly connected to the outer wall of the second valve body, and the other end of the second spring is fixedly connected to the second valve stem.

[0023] By adopting the above technical solution, the water-absorbing expansion block expands and abuts the connecting rod, so that the second valve stem overcomes the elastic force of the second spring and slides, the second spring extends, and the second valve flap moves to connect the drain pipe, thereby discharging the coolant in the stator, reducing the probability of motor short circuit, extending the service life of the motor, and the coolant discharge reminds the operator to carry out maintenance.

[0024] Preferably, it also includes a rotor, a rotating shaft and fan blades, both ends of the shell are provided with a rotating opening, the rotating opening is connected to the accommodating cavity, the rotor is coaxially fixedly connected to the outer wall of the rotating shaft, the rotor rotates coaxially on the inner periphery of the stator, the rotating shaft is coaxially rotatably connected to the inner wall of the rotating opening, both ends of the shell are provided with ventilation openings, the ventilation openings are arranged on the outer periphery of the rotating opening, the ventilation openings are connected to the accommodating cavity, the fan blades are arranged on the outer periphery of the shell, and the fan blades are fixedly connected to the outer wall of the rotating shaft.

[0025] By adopting the above technical solution, the rotation of the shaft drives the fan blades to rotate, thereby accelerating the air flow in the accommodating cavity and improving the heat dissipation efficiency. If coolant leaks, it is easy to dry by air, thereby extending the service life of the motor.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The coolant passes through the opening and fully contacts with the stator at high temperature to exchange energy, which greatly shortens the heat transfer path, improves the overall heat transfer coefficient, and improves the heat dissipation efficiency; 2. The coolant is collected in the water tank, and the water-absorbing expansion block absorbs the coolant, reducing water stains in the accommodating cavity, reducing the probability of short circuit of the wiring harness, and extending the service life of the equipment; 3. The water-absorbing expansion block expands and abuts against the connecting rod, so that the second valve stem overcomes the elastic force of the second spring and slides, the second spring extends, and the second valve disc moves to connect the drain pipe, thereby discharging the coolant in the stator, reducing the probability of motor short circuit, and extending the service life of the motor. The coolant discharge reminds the operator to carry out maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the water cooling system inside the motor stator.

[0028] Figure 2 It is a schematic diagram of the internal structure of the water cooling system inside the motor stator after it is cut open.

[0029] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0030] Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0031] Description of the reference numerals: 1, shell; 11, main body; 111, liquid inlet; 112, drain outlet; 113, liquid outlet; 12, seat; 13, end cover; 131, rotating port; 132, vent; 14, accommodating chamber; 141, water receiving tank; 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 connecting port; 72, second connecting ring; 7 21. Second annular groove; 722. Second connecting port; 723. Third connecting port; 73. Retaining 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 passage; 782. First valve stem; 783. First valve disc; 784. First spring; 79. Second stop valve; 791. Second valve body; 7911. Sliding port; 7912. Make-break port; 792. Second valve stem; 793. Second valve disc; 794. Connecting rod; 795. Second spring. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-4 This application is described in further detail.

[0033] The present application embodiment discloses a water cooling system inside a motor stator. Figure 1 and Figure 2 A motor stator internal water cooling system includes a housing 1, a stator 2, a rotor 3, a rotating shaft 4, a bearing 5, an air cooling component 6 and a water cooling component 7.

[0034] Reference Figure 2 The shell 1 includes 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. Two seat bodies 12 are provided. The two seat bodies 12 are spaced apart along the width direction of the main body 11. The two seat bodies 12 improve the stability of the shell 1. Two end covers 13 are provided. The two end covers 13 are fixedly connected to the two ends of the main body 11 by bolts respectively. The main body 11 and the two end covers 13 together form a accommodating cavity 14.

[0035] The stator 2 is fixedly connected to the inner wall of the accommodating chamber 14, the end cover 13 is provided with a rotating port 131, the rotating port 131 is connected to the accommodating chamber 14, the rotor 3 is coaxially fixedly connected to the outer wall of the rotating shaft 4, the rotor 3 rotates coaxially on the inner circumference of the stator 2, the outer wall of the rotating shaft 4 is coaxially fixedly connected to the inner wall of the bearing 5, the outer wall of the bearing 5 is coaxially fixedly connected to the inner wall of the rotating port 131, two bearings 5 ​​are provided, and the bearings 5 ​​and the rotating ports 131 are arranged one by one.

[0036] Reference Figure 2The air cooling component 6 includes a dustproof net 61, a fan blade 62 and a cover shell 63. The end cover 13 is provided with a vent 132. The vent 132 is arranged at the outer periphery of the rotating port 131. The vent 132 is connected to the accommodating chamber 14. There are multiple vents 132. The multiple vents 132 are evenly spaced around the axis of the rotating port 131. The dustproof net 61 is coaxially fixedly connected to the inner wall of the vent 132. The dustproof net 61 is used to prevent impurities from entering the accommodating chamber 14. The fan blade 62 is arranged at the outer periphery of the shell 1. The fan blade 62 is fixedly connected to the outer wall of the rotating shaft 4. One end of the cover shell 63 is provided with a mounting groove 631. The groove wall of the mounting groove 631 is fixedly connected to the outer wall of the main body 11. An end cover 13 and the fan blade 62 are arranged in the mounting groove 631. The outer wall of the cover shell 63 is provided with an isolation port 632. The isolation port 632 is connected to the mounting groove 631. There are multiple isolation ports 632.

[0037] The water cooling assembly 7 includes a first connecting ring 71, a second connecting ring 72, a retaining ring 73, a water absorption 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 winding port 21, the winding port 21 is used for winding the wire harness, the stator 2 is provided with a through port 22, the through port 22 is arranged at the outer periphery of the winding port 21, the axis of the through port 22 is parallel to the axis of the stator 2, the through port 22 runs through the stator 2, and the through port 22 is used to pass the coolant. There are a plurality of through ports 22, and the plurality of through ports 22 are evenly spaced around the axis of the stator 2.

[0038] Reference Figure 2 The first connecting ring 71 and the second connecting ring 72 are respectively fixedly connected to the two ends of the stator 2. 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 annular groove 711 at one end facing the stator 2, and the second connecting ring 72 is coaxially provided with a second annular groove 721 at one 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 is provided with a first connecting port 712, and the first connecting port 712 is connected to the first annular groove 711. The outer wall of the second connecting ring 72 is provided with a second connecting port 722 and a third connecting port 723, and the second connecting port 722 and the third connecting port 723 are connected to the second annular groove 721. The height of the second connecting port 722 is greater than the height of the first connecting port 712, and the height of the third connecting port 723 is equal to the height of the first connecting port 712. The first connecting port 712 is arranged close to the bottom wall of the accommodating cavity 14, and the second connecting port 722 is arranged close to the top wall of the accommodating cavity 14.

[0039] The retaining ring 73 is arranged between the through opening 22 and the winding opening 21. The retaining ring 73 is provided with the inner circumference of the first connecting ring 71 and the second connecting ring 72. There are two retaining rings 73. 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. 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. The end of the retaining ring 73 away from the stator 2 extends in a direction away from the axis of the stator 2 to form a flange 731 to reduce the probability of contact between the coolant and the wiring harness.

[0040] Reference Figure 2 The upward inner wall of the accommodating chamber 14 is provided with a water receiving groove 141, which is used to receive the coolant leaked from the stator 2. The water absorbing expansion block 74 is embedded in the water receiving groove 141, and the water absorbing expansion block 74 abuts against the downward outer wall of the stator 2. The lower end of the main body 11 is provided with a liquid inlet 111 and a drain port 112, and the upper end of the main body 11 is provided with a liquid outlet 113. The liquid inlet 111, the drain port 112 and the liquid outlet 113 are all connected to the accommodating chamber 14. The liquid outlet 113 is provided between the second connecting ring 72 and the end cover 13, and the liquid outlet pipe 75 passes through the liquid outlet 113 and is coaxially fixedly connected to the inner wall of the second connecting port 722.

[0041] The liquid inlet 111 and the drain outlet 112 are both connected to the bottom of the water receiving trough 141. The liquid inlet 111 and the drain outlet 112 are arranged on both sides of the water absorption expansion block 74. The liquid inlet 111 is arranged on the side of the drain outlet 112 away from the fan blade 62. The liquid inlet pipe 76 passes through the liquid inlet 111 and is coaxially fixedly connected to the inner wall of the first connecting port 712. The drain pipe 77 passes through the drain outlet 112 and is coaxially fixedly connected to the inner wall of the third connecting port 723. 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 outlet 112. The height of the bottom of the water receiving trough 141 increases as it moves away from the water absorption expansion block 74.

[0042] Reference Figure 2 and Figure 3The first stop valve 78 includes a first valve body 781, a first valve stem 782, a first valve flap 783 and a first spring 784. The first valve body 781 is connected to the liquid inlet pipe 76. The first valve body 781 is arranged in the water receiving groove 141. The first valve body 781 is provided with a sliding port 7811 at one end facing the water absorption expansion block 74. The first valve stem 782 is slidably connected to the inner wall of the sliding port 7811. The sliding direction of the first valve stem 782 is parallel to the length direction of the water receiving groove 141. A water through port 7812 is provided in the first valve body 781. The first valve The flap 783 is arranged in the first valve body 781, and the first flap 783 is fixedly connected to one end of the first valve stem 782. The first flap 783 is used to block the water port 7812 to control the on-off of the liquid inlet pipe 76. The end of the first valve stem 782 away from the first flap 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, and 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 outer wall of the first valve stem 782. When the first spring 784 is not subjected to force, the first flap 783 is away from the water port 7812, and the liquid inlet pipe 76 is connected.

[0043] Reference Figure 2 and Figure 4 The second stop valve 79 includes a second valve body 791, a second valve stem 792, a second valve flap 793, a connecting rod 794 and a second spring 795. The second valve body 791 is connected to the drain pipe 77. The second valve body 791 is arranged in the water receiving groove 141. The end of the second valve body 791 away from the water absorption 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 sliding direction of the second valve stem 792 is parallel to the length direction of the water receiving groove 141. The second valve body 791 is provided with an on-off port 7912. The second valve flap 793 is arranged in the second valve body 791. The second valve flap 793 is arranged in the second valve body 791. 3 is fixedly connected to one end of the second valve stem 792, the second valve flap 793 is used to block the on-off opening 7912 to control the on-off of the discharge pipe 77, one end of the second valve stem 792 away from the second valve flap 793 is fixedly connected to one end of the connecting rod 794, the other end of the connecting rod 794 is arranged on the side of the second valve body 791 close to the water absorption expansion block 74, the connecting rod 794 is used to abut the water absorption 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. When the second spring 795 is not subjected to force, the second valve flap 793 blocks the on-off opening 7912, and the discharge pipe 77 is not connected.

[0044] Reference Figure 3 and Figure 4 , the elastic force of the second spring 795 is greater than the elastic force of the first spring 784 .

[0045] The implementation principle of the water cooling system inside the motor stator of the embodiment of the present application is as follows: the rotation of the rotating shaft 4 drives the fan blades 62 to rotate, so that the wind accelerates the air flow in the accommodating chamber 14 through the vent 132, and performs air cooling and heat dissipation. The coolant is passed into the liquid inlet pipe 76, and the coolant cools the stator 2 through the first annular groove 711, the through port 22 and the second annular groove 721. The coolant is discharged from the liquid outlet pipe 75, and the coolant is continuously introduced to take away the heat of the stator 2 to achieve water cooling and heat dissipation. If the stator 2 leaks, the internal temperature of the stator 2 is relatively high, and the coolant is vaporized with the air cooling, thereby reducing the probability of short circuit of the wiring harness. If the leakage is large, the liquid enters the water receiving groove 141, and the water absorption expansion block 74 expands, so that the first stop valve 78 is closed first, and the second stop valve 79 is opened again, so that the coolant in the stator 2 is quickly discharged, and the operator is reminded to perform maintenance. While the air cooling and heat dissipation are performed, the water vapor in the accommodating chamber 14 is taken away, thereby extending the service life of the motor.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A water cooling system inside a motor stator, characterized in that: The invention comprises a shell (1) and a stator (2), wherein the shell (1) is provided with a receiving cavity (14), the stator (2) is fixedly connected to the inner wall of the receiving cavity (14), the stator (2) is provided with a through opening (22), the axis of the through opening (22) is parallel to the axis of the stator (2), the through opening (22) passes through the stator (2), and the through opening (22) is used for passing a cooling liquid.

2. The motor stator internal water cooling system according to claim 1, characterized in that: A plurality of through openings (22) are provided, and the plurality of through openings (22) are evenly spaced around the axis of the stator (2).

3. The motor stator internal water cooling system according to claim 2, characterized in that: The invention also comprises a first connecting ring (71) and a second connecting ring (72), wherein the first connecting ring (71) and the second connecting ring (72) are respectively fixedly connected to two ends of the stator (2); a first annular groove (711) is coaxially provided at one end of the first connecting ring (71) facing the stator (2); a second annular groove (721) is coaxially provided at one end of the second connecting ring (72) facing the stator (2); the first annular groove (711) and the second annular groove (721) are both connected to the through port (22); a first connecting port (712) is provided on the outer wall of the first connecting ring (71); and a second connecting port (722) is provided on the outer wall of the second connecting ring (72).

4. The motor stator internal water cooling system according to claim 3, characterized in that: It also comprises a liquid inlet pipe (76) and a liquid outlet pipe (75); the outer wall of the shell (1) is provided with a liquid inlet port (111) and a liquid outlet port (113); the liquid inlet pipe (76) passes through the liquid inlet port (111) and is coaxially fixedly connected to the inner wall of the first connecting port (712); the liquid outlet pipe (75) passes through the liquid 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).

5. The motor stator internal water cooling system according to claim 4, characterized in that: The stator (2) further comprises a retaining ring (73), the stator (2) being provided with a winding opening (21), the winding opening (21) being arranged on the inner periphery of the through opening (22), the retaining ring (73) being arranged between the through opening (22) and the winding opening (21), both ends of the stator (2) being coaxially fixedly connected to the retaining ring (73), the distance from the retaining ring (73) to the stator (2) being 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) being greater than the distance from the second connecting ring (72) to the stator (2).

6. The motor stator internal water cooling system according to claim 5, characterized in that: It also comprises a water absorbing expansion block (74); the upward inner wall of the accommodating cavity (14) is provided with a water receiving groove (141); the water receiving groove (141) is used to receive the coolant leaked from the stator (2); and the water absorbing expansion block (74) is embedded in the water receiving groove (141).

7. The motor stator internal water cooling system according to claim 6, characterized in that: The water absorption expansion block (74) abuts against the outer wall of the stator (2).

8. The motor stator internal water cooling system according to claim 6, characterized in that: The device further comprises a first stop valve (78), the first stop valve (78) comprising a first valve body (781), a first valve stem (782), a first valve flap (783) and a first spring (784); the bottom of the water receiving groove (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 arranged in the water receiving groove (141); one end of the first valve body (781) facing the water absorption expansion block (74) is provided with a sliding opening (7811); the first valve stem (782) is slidably connected to the inner wall of the sliding opening (7811); The first valve flap (783) is arranged in the first valve body (781), the first valve flap (783) is fixedly connected to the first valve stem (782), the first valve flap (783) is used to control the on-off of the liquid inlet pipe (76), one end of the first valve stem (782) away from the first valve flap (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).

9. The motor stator internal water cooling system according to claim 8, characterized in that: The housing (1) further comprises a liquid discharge pipe (77) and a second stop valve (79); the outer wall of the second connecting ring (72) is provided with a third communication port (723); the height of the third communication port (723) is less than or equal to the height of the first communication port (712); the housing (1) is provided with a water discharge port (112); the water discharge port (112) is connected to the bottom of the water receiving tank (141); the water discharge port (112) and the liquid inlet (111) are respectively provided on both sides of the water absorption expansion block (74); The drain pipe (77) passes through the drain port (112) and is coaxially fixedly connected to the inner wall of the third communication port (723). The second stop valve (79) comprises a second valve body (791), a second valve stem (792), a second valve flap (793), a connecting rod (794) and a second spring (795). The second valve body (791) is connected to the drain pipe (77). The second valve body (791) is arranged in the water receiving tank (141). The second valve body (791) faces away from the suction port. A sliding opening (7911) is provided at one end of the water expansion block (74); the second valve stem (792) is slidably connected to the inner wall of the sliding opening (7911); the second valve flap (793) is provided in the second valve body (791); the second valve flap (793) is fixedly connected to the second valve stem (792); the second valve flap (793) is used to control the on / off of the discharge pipe (77); and one end of the second valve stem (792) that is away from the second valve flap (793) is fixedly connected to the connecting rod The second valve stem (792) is provided with one end of the connecting rod (794), the other end of the connecting rod (794) is provided on a side of the second valve body (791) close to the water absorption expansion block (74), the connecting rod (794) is used to abut the water absorption 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).

10. The motor stator internal water cooling system according to claim 1, characterized in that: The invention also comprises a rotor (3), a rotating shaft (4) and a fan blade (62); both ends of the housing (1) are provided with a rotating opening (131); the rotating opening (131) is connected to the accommodating chamber (14); the rotor (3) is coaxially fixedly connected to the outer wall of the rotating shaft (4); the rotor (3) rotates coaxially on the inner periphery of the stator (2); the rotating shaft (4) is coaxially rotatably connected to the inner wall of the rotating opening (131); both ends of the housing (1) are provided with a vent (132); the vent (132) is arranged on the outer periphery of the rotating opening (131); the vent (132) is connected to the accommodating chamber (14); the fan blade (62) is arranged on the outer periphery of the housing (1); the fan blade (62) is fixedly connected to the outer wall of the rotating shaft (4).

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