Motor cooling system

Abstract

The present invention relates to the technical field of liquid-cooled motors, and discloses a motor cooling system, including a liquid cooling unit; the liquid cooling unit includes a spiral partition plate arranged on a motor housing, the spiral partition plates have the same pitch, a liquid cooling housing is closely arranged on the outer side of the spiral partition plate, and the two ends of the liquid cooling housing are respectively connected to the left end cover and the right end cover, and the spiral partition plate divides the cavity between the motor housing and the liquid cooling housing into a spiral cooling channel, and a liquid outlet pipe is arranged at each end of the spiral cooling channel, and a liquid inlet pipe is arranged in the middle of the spiral cooling channel. The motor cooling system reduces the flow resistance of the coolant, increases the flow rate of the coolant, and improves the heat dissipation efficiency by arranging the spiral cooling channel; by arranging the liquid inlet pipe in the middle of the spiral cooling channel and the liquid outlet pipe at both ends of the spiral cooling channel, the circulation length of the coolant in the spiral cooling channel is reduced, and the heat dissipation of the motor housing is made more uniform.

Description

Technical Field

[0001] The invention relates to the technical field of liquid-cooled motors, and in particular to a motor cooling system. Background Art

[0002] Liquid-cooled motors are a technology that uses liquid (usually a coolant such as water or a glycol mixture) to cool the motor. Compared with traditional air-cooled motors, liquid-cooled motors have higher cooling efficiency and better temperature management performance. Liquid-cooled motors are widely used in fields that require high power density and efficient heat dissipation, such as electric vehicles, industrial motors, and high-performance power tools.

[0003] In the design of liquid-cooled motors, the shape and layout of the cooling channel have a direct impact on the cooling effect. Common cooling channel shapes and their characteristics mainly include straight cooling channels, spiral cooling channels, wavy cooling channels, circular cooling channels, grid cooling channels, parallel channel cooling channels, etc. The design of cooling channels of different shapes needs to be selected according to the specific structure, power requirements, heat dissipation requirements and manufacturing process of the motor.

[0004] A water-cooling chamber for a driving motor of an electric vehicle is disclosed in the patent publication number CN1545185A, which is characterized in that the inner ring layer (1) of the water-cooling chamber layer (Q) is also the outer ring layer of the driving motor stator (D); the water-cooling chamber layer (Q) is composed of an inner ring layer (1), an intermediate cooling channel layer (2) and an outer ring shell layer (3); the intermediate cooling channel layer (2) is formed by spiral heat dissipation ribs (2.1) winding around the inner ring layer (1) of the water-cooling chamber.

[0005] The prior art has the following defects:

[0006] In the prior art, no matter what shape of the cold channel is used, the coolant flows in from the liquid inlet, and flows out from the liquid outlet through the cold channel for heat exchange, and circulates continuously; on the one hand, the cold channel has a certain length, and the temperature difference of the coolant in the front section of the cold channel decreases after absorbing heat, and the heat exchange rate decreases when flowing through the rear section; on the other hand, the heat distribution of the entire motor is uneven, such as the heat of the rotor is concentrated in the middle, the heat of the stator is concentrated at both ends of the winding, and the heat transferred to the motor housing through the gap is also unevenly distributed. The uneven heat dissipation of the motor will not only affect the performance and efficiency of the motor, but may also bring risks to the life and safety of the motor. Therefore, it is very important to ensure good heat dissipation uniformity during motor design and operation. Summary of the invention

[0007] In view of the above problems in the prior art, a motor cooling system is proposed.

[0008] The present application provides a motor cooling system, the purpose of which is to design cooling channels in a diversified manner so that the local cooling channels change shape according to the temperature distribution of the motor housing, thereby changing the local heat dissipation efficiency of the motor housing and achieving uniform heat dissipation of the motor as a whole.

[0009] The technical solution of the present invention is: a motor cooling system, comprising a motor housing, a stator arranged in the motor housing, a rotor rotatably arranged in the stator, and a left end cover arranged at the left end of the motor housing and a right end cover arranged at the right end of the motor housing, wherein a liquid cooling unit is arranged on the motor housing;

[0010] The liquid cooling unit comprises a spiral partition plate arranged on the motor housing, the spiral partition plates have the same pitch, a liquid cooling housing is closely arranged on the outer side of the spiral partition plate, the two ends of the liquid cooling housing are respectively connected to the left end cover and the right end cover, the spiral partition plate divides the cavity between the motor housing and the liquid cooling housing into a spiral cooling channel, a liquid outlet pipe is respectively arranged at the two ends of the spiral cooling channel, and a liquid inlet pipe is arranged in the middle of the spiral cooling channel;

[0011] The liquid cooling unit further comprises a temperature equalizing component, and a plurality of the temperature equalizing components are arranged at equal intervals along the spiral cooling channel;

[0012] The temperature equalizing component includes an arc-shaped groove opened on the outer wall of the motor housing, and a double-layer metal sheet covering the arc-shaped groove, the double-layer metal sheet includes an upper metal sheet and a lower metal sheet, the thermal expansion coefficient of the lower metal sheet is greater than the thermal expansion coefficient of the upper metal sheet, the double-layer metal sheet is provided with an arc-shaped opening, the arc-shaped opening is arranged on the side of the coolant outflow direction, the double-layer metal sheet is provided with an arc-shaped crack, the arc-shaped crack is arranged on the side of the coolant inflow direction, and the arc-shaped crack divides the double-layer metal sheet into arc-shaped sheets;

[0013] The arc-shaped sheet bends in a direction away from the arc-shaped groove when heated, and the coolant flows into the arc-shaped groove from the bottom of the arc-shaped sheet and flows out of the arc-shaped groove from the arc-shaped opening.

[0014] By adopting the above scheme, a spiral cooling channel is set up to reduce the flow resistance of the coolant, increase the flow rate of the coolant, and improve the heat dissipation efficiency; by setting the liquid inlet pipe in the middle of the spiral cooling channel and the liquid outlet pipes at both ends of the spiral cooling channel, the circulation length of the coolant in the spiral cooling channel is reduced, so that the heat dissipation of the motor housing is more uniform; by setting a temperature equalizing component, when the local temperature of the motor housing is too high, the temperature changes, and due to the different thermal expansion coefficients of the two materials, the arc sheet will bend, and the coolant will flow into the arc groove, thereby increasing the cross-sectional area of ​​the spiral cooling channel at that location and increasing the heat dissipation efficiency; at the same time, the higher the local temperature, the greater the bending angle of the arc sheet, the more coolant flows through the arc groove, and the better the heat dissipation effect on the overheated position, thereby equalizing the heat dissipation effect of the entire motor.

[0015] Furthermore, a clamping end is provided at the edge of the spiral partition, and a spiral groove is provided on the inner wall of the liquid cooling shell. The pitch of the spiral groove is the same as the pitch of the spiral partition, and the spiral groove and the clamping end cooperate with each other.

[0016] By adopting the above scheme, the spiral groove cooperates with the clamping end, and the liquid cooling shell is connected to the spiral partition by rotating during installation, so that the motor shell, spiral partition and liquid cooling shell are manufactured separately, avoiding the high process difficulty of one-piece casting.

[0017] Furthermore, an embedding groove having the same shape as the double-layer metal sheet is provided at the opening of the arc-shaped groove, and the double-layer metal sheet is installed in the embedding groove.

[0018] By adopting the above solution, the double-layer metal plate is installed in the fitting groove so that the double-layer metal plate fits the bottom shape of the spiral cooling channel, thereby reducing the flow resistance of the coolant.

[0019] Furthermore, claws for fixing the double-layer metal sheet are arranged around the engaging groove.

[0020] By adopting the above solution, the double-layer metal sheet is fixed in the fitting groove by providing a clamping catch, so as to prevent deformation of the double-layer metal sheet except for the arc-shaped sheet.

[0021] Furthermore, a liquid separator is provided in the middle of the spiral cooling channel, and a liquid inlet cavity is provided between the liquid inlet pipe and the cooling shell. The liquid inlet cavity is respectively connected to the spiral cooling channels on both sides of the liquid separator, and the coolant in the spiral cooling channels on both sides of the liquid separator has opposite flow directions.

[0022] By adopting the above scheme, the liquid inlet cavity and the liquid separator are provided, so that the cooling liquid in the liquid inlet pipe is divided by the liquid inlet cavity and flows into the spiral cooling channels located on both sides of the liquid separator.

[0023] Furthermore, the material of the upper metal sheet is nickel, and the material of the lower metal sheet is aluminum.

[0024] With the above solution, aluminum has a high thermal expansion coefficient, while nickel has a low thermal expansion coefficient. This combination can produce a larger bending effect and is suitable for bimetallic strip applications that require a larger bending range.

[0025] Furthermore, a sealing ring 1 is provided on the left end face of the motor housing, and the left end of the liquid cooling housing is sealedly connected to the sealing ring 1; a sealing ring 2 is provided on the right end of the liquid cooling housing, and the right end of the motor housing is sealedly connected to the sealing ring 2.

[0026] By adopting the above solution, by providing sealing ring 1 and sealing ring 2, the two ends of the motor housing and the liquid cooling housing are squeezed and sealed against each other to ensure the sealing of the spiral cooling channel.

[0027] Beneficial effects of the present invention:

[0028] By setting up a spiral cooling channel, the flow resistance of the coolant is reduced, the flow rate of the coolant is increased, and the heat dissipation efficiency is improved; by setting the water pipe in the middle of the spiral cooling channel and the liquid outlet pipe at both ends of the spiral cooling channel, the circulation length of the coolant in the spiral cooling channel is reduced, and the heat dissipation of the motor casing is more uniform.

[0029] By setting up a temperature equalizing component, when the local temperature of the motor casing is too high, the temperature changes. Due to the different thermal expansion coefficients of the two materials, the arc-shaped sheet will bend, and the coolant will flow into the arc-shaped groove, increasing the cross-sectional area of ​​the spiral cooling channel at that location and increasing the heat dissipation efficiency; at the same time, the higher the local temperature, the greater the bending angle of the arc-shaped sheet, the more coolant flows through the arc-shaped groove, the better the heat dissipation effect on the overheated position, thereby equalizing the heat dissipation effect of the entire motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional diagram of the motor cooling system of the present invention;

[0031] Figure 2 It is a right side view of the motor cooling system of the present invention;

[0032] Figure 3 For the present invention Figure 2 Sectional view at AA;

[0033] Figure 4 For the present invention Figure 3 A magnified view of the structure at B in the middle;

[0034] Figure 5 This is a structural diagram of the liquid cooling housing in the motor cooling system of the present invention;

[0035] Figure 6 For the present invention Figure 5 The working principle diagram of the structure at C in the middle;

[0036] Figure 7 For the present invention Figure 6 sectional view of .

[0037] In the figure:

[0038] 1. Motor housing; 2. Stator; 3. Rotor; 4. Left end cover; 5. Right end cover; 6. Spiral partition; 7. Liquid cooling housing; 8. Spiral cooling channel; 9. Liquid outlet pipe; 10. Liquid inlet pipe; 11. Snap-on end; 12. Spiral groove; 13. Temperature equalization component; 14. Arc groove; 15. Double-layer metal sheet; 16. Arc mouth; 17. Arc crack; 18. Arc sheet; 19. Fitting groove; 20. Claw; 21. Liquid separator plate; 22. Liquid inlet chamber; 23. Sealing ring 1; 24. Sealing ring 2. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0040] Example 1, reference Figure 1-7 , which is the first embodiment of the present invention, provides a motor cooling system, including a motor housing 1, a stator 2 arranged in the motor housing 1, a rotor 3 rotatably arranged in the stator 2, and a left end cover 4 arranged at the left end of the motor housing 1 and a right end cover 5 arranged at the right end of the motor housing 1, and a liquid cooling unit is arranged on the motor housing 1; the liquid cooling unit includes a spiral partition 6 arranged on the motor housing 1, the spiral partition 6 has the same pitch, and a liquid cooling shell 7 is tightly arranged on the outer side of the spiral partition 6, and the two ends of the liquid cooling shell 7 are respectively connected to the left end cover 4 and the right end cover 5, and the spiral partition 6 divides the cavity between the motor housing 1 and the liquid cooling shell 7 into a spiral cooling channel 8, and a liquid outlet pipe 9 is respectively arranged at the two ends of the spiral cooling channel 8, and a liquid inlet pipe 10 is arranged at the middle position of the spiral cooling channel 8.

[0041] Specifically, the liquid inlet pipe 10 is connected to the outlet of the coolant pump, and the coolant pump is responsible for pressurizing the coolant and delivering it to the liquid inlet of the motor to ensure that the coolant can smoothly enter the motor for cooling; the liquid outlet pipe 9 is usually connected to the inlet of the radiator, and the function of the radiator is to reduce the temperature of the coolant and dissipate the heat taken away from the motor into the environment. The radiator can be air-cooled or liquid-cooled.

[0042] The stator 2 of the motor is attached to the motor housing 1. The heat generated by the stator 2 is mainly removed by designing liquid cooling channels around the stator 2 so that the coolant flows through these channels to take away the heat generated by the stator 2 during operation.

[0043] By setting up the spiral cooling channel 8, the flow resistance of the coolant is reduced, the flow rate of the coolant is increased, and the heat dissipation efficiency is improved; by setting the liquid inlet pipe 10 in the middle of the spiral cooling channel 8 and the liquid outlet pipe 9 at both ends of the spiral cooling channel 8, the circulation length of the coolant in the spiral cooling channel 8 is reduced, so that the heat dissipation of the motor housing 1 is more uniform.

[0044] Uneven heat dissipation of the motor will bring many hazards, mainly including the following aspects:

[0045] Uneven heat dissipation can cause local overheating in some parts of the motor. Overheating can accelerate the aging of the insulation material, shorten the service life of the motor, and may even cause insulation failure, resulting in short circuit or motor failure. When the temperature of some parts of the motor is high, the resistance will increase, which will lead to a decrease in the motor's operating efficiency. At the same time, the increase in temperature will also increase the iron loss and copper loss of the motor, further affecting the efficiency. Uneven temperature can cause thermal stress inside the motor, especially between the stator 2 and the rotor 3. If these thermal stresses exceed the allowable stress range of the material, they may cause deformation or even cracking of the material. Uneven temperature of the motor may affect the lubrication effect of the bearing, causing the temperature of the bearing to rise, resulting in deterioration of the lubricating oil and a decrease in the lubrication effect, thereby aggravating the wear of the bearing and affecting the smooth operation of the motor. The temperature difference caused by uneven heat dissipation may cause inconsistent thermal expansion of motor components, causing changes in the gap between the rotor 3 and the stator 2, thereby increasing the noise and vibration of the motor during operation. Therefore, uneven heat dissipation of the motor will not only affect the performance and efficiency of the motor, but may also bring greater risks to the life and safety of the motor. Therefore, it is very important to ensure good heat dissipation uniformity during motor design and operation.

[0046] Reference Figure 4 A clamping end 11 is provided at the edge of the spiral partition 6, and a spiral groove 12 is provided on the inner wall of the liquid cooling shell 7. The pitch of the spiral groove 12 is the same as the pitch of the spiral partition 6, and the spiral groove 12 and the clamping end 11 match each other.

[0047] Specifically, the spiral groove 12 and the clamping end 11 are equivalent to threaded fit. Based on this installation method, the motor housing 1, the spiral partition 6 and the liquid cooling housing 7 are manufactured separately. The spiral partition 6 and the motor housing 1 are brazed first, and then the liquid cooling housing 7 is screwed to the outside of the spiral partition 6.

[0048] By cooperating with the spiral groove 12 and the clamping end 11, the liquid cooling shell 7 is connected to the spiral partition 6 by rotating during installation, so that the motor housing 1, the spiral partition 6 and the liquid cooling shell 7 are manufactured separately, thereby solving the problem of high roughness of the liquid cooling cavity under the casting process, which affects the flow resistance of the cooling liquid.

[0049] Reference Figure 6-Figure 7The liquid cooling unit also includes a temperature equalizing component 13, and a plurality of temperature equalizing components 13 are arranged at equal intervals along the spiral cooling channel 8; the temperature equalizing component 13 includes an arc groove 14 opened on the outer wall of the motor housing 1, and a double-layer metal sheet 15 covering the arc groove 14, the double-layer metal sheet 15 includes an upper metal sheet and a lower metal sheet, the thermal expansion coefficient of the lower metal sheet is greater than the thermal expansion coefficient of the upper metal sheet, and an arc-shaped opening 16 is provided on the double-layer metal sheet 15, and the arc-shaped opening 16 is arranged on one side of the coolant outflow direction, and an arc-shaped crack 17 is provided on the double-layer metal sheet 15, and the arc-shaped crack 17 is arranged on one side of the coolant inflow direction, and the arc-shaped crack 17 divides the double-layer metal sheet 15 into arc-shaped sheets 18; when heated, the arc-shaped sheets 18 bend in a direction away from the arc groove 14, and the coolant flows into the arc groove 14 from below the arc-shaped sheet 18, and flows out of the arc groove 14 from the arc-shaped opening 16.

[0050] Specifically, the double-layer metal sheets 15 on both sides of the liquid inlet pipe 10 are arranged in opposite directions, the upper metal sheet material is nickel, and the lower metal sheet material is aluminum. The upper layer here refers to the side of the double-layer metal sheet 15 away from the arc groove 14, and the lower layer here refers to the side of the double-layer metal sheet 15 close to the arc groove 14. The two layers of metal are bonded together to form the double-layer metal sheet 15. Aluminum has a high thermal expansion coefficient, while nickel has a lower thermal expansion coefficient. This combination can produce a larger bending effect and is suitable for bimetallic applications that require a larger bending range.

[0051] like Figure 7 As shown in the figure, the dotted line represents the flow direction of the coolant. When the heat transferred from the motor housing 1 to the arc-shaped sheet 18 is not enough to bend the arc-shaped sheet 18, the coolant only flows through the spiral cooling channel 8 above the double-layer metal sheet 15; when the heat transferred from the motor housing 1 to the arc-shaped sheet 18 exceeds 150°, the arc-shaped sheet 18 will bend significantly, and the coolant will be diverted at the arc-shaped sheet 18, and at the same time flow through the arc groove 14 and the spiral cooling channel 8 above the arc groove 14 and then merge.

[0052] By setting the temperature equalizing component 13, when the local temperature of the motor housing 1 is too high, the temperature changes. Due to the different thermal expansion coefficients of the two materials, the arc-shaped piece 18 will bend, and the coolant will flow into the arc-shaped groove 14, thereby increasing the cross-sectional area of ​​the spiral cooling channel 8 at that location and increasing the heat dissipation efficiency. At the same time, the higher the local temperature, the greater the bending angle of the arc-shaped piece 18, the more coolant flows through the arc-shaped groove 14, and the better the heat dissipation effect on the overheated position, thereby equalizing the heat dissipation effect of the entire motor.

[0053] Reference Figure 7 An embedding groove 19 with the same shape as the double-layer metal sheet 15 is provided at the opening of the arc groove 14, and the double-layer metal sheet 15 is installed in the embedding groove 19.

[0054] By installing the double-layer metal plate into the fitting groove 19 , the double-layer metal sheet 15 is made to fit the bottom shape of the spiral cooling channel 8 , thereby reducing the flow resistance of the coolant.

[0055] Reference Figure 6 The engaging groove 19 is surrounded by claws 20 for fixing the double-layer metal sheet 15 .

[0056] By providing the clamping catch, the double-layer metal sheet 15 is fixed in the fitting groove 19 to prevent the double-layer metal sheet 15 from being deformed except for the arc-shaped sheet 18 .

[0057] Reference Figure 5 A liquid separator 21 is provided in the middle of the spiral cooling channel 8, and a liquid inlet cavity 22 is provided between the liquid inlet pipe 10 and the cooling shell. The liquid inlet cavity 22 is respectively connected to the spiral cooling channels 8 on both sides of the liquid separator 21, and the coolant in the spiral cooling channels 8 on both sides of the liquid separator 21 flows in opposite directions.

[0058] By providing the liquid inlet cavity 22 and the liquid separation plate 21 , the cooling liquid in the liquid inlet pipe 10 is divided by the liquid inlet cavity 22 and flows into the spiral cooling channels 8 located on both sides of the liquid separation plate 21 .

[0059] Reference Figure 3 The left end face of the motor housing 1 is provided with a sealing ring 1 23, the left end of the liquid cooling housing 7 is sealed and connected to the sealing ring 1 23, the right end of the liquid cooling housing 7 is provided with a sealing ring 24, and the right end of the motor housing 1 is sealed and connected to the sealing ring 24.

[0060] By providing a sealing ring 1 23 and a sealing ring 24 , the motor housing 1 and the liquid cooling housing 7 are squeezed and sealed against each other at both ends, thereby ensuring the sealing of the spiral cooling channel 8 .

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A motor cooling system, comprising a motor housing (1), a stator (2) disposed in the motor housing (1), a rotor (3) rotatably disposed in the stator (2), and a left end cover (4) disposed at the left end of the motor housing (1) and a right end cover (5) disposed at the right end of the motor housing (1), characterized in that: The motor housing (1) is provided with a liquid cooling unit; The liquid cooling unit comprises a spiral partition (6) arranged on the motor housing (1), the spiral partitions (6) having the same pitch, a liquid cooling housing (7) being closely arranged on the outer side of the spiral partition (6), the two ends of the liquid cooling housing (7) being respectively connected to the left end cover (4) and the right end cover (5), the spiral partition (6) dividing the cavity between the motor housing (1) and the liquid cooling housing (7) into a spiral cooling channel (8), a liquid outlet pipe (9) being arranged at each end of the spiral cooling channel (8), and a liquid inlet pipe (10) being arranged in the middle of the spiral cooling channel (8); The liquid cooling unit further comprises a temperature equalizing component (13), wherein a plurality of the temperature equalizing components (13) are arranged at equal intervals along the spiral cooling channel (8); The temperature equalizing component (13) comprises an arc-shaped groove (14) provided on the outer wall of the motor housing (1), and a double-layer metal sheet (15) covering the arc-shaped groove (14), wherein the double-layer metal sheet (15) comprises an upper metal sheet and a lower metal sheet, wherein the thermal expansion coefficient of the lower metal sheet is greater than the thermal expansion coefficient of the upper metal sheet, and the double-layer metal sheet (15) is provided with an arc-shaped opening (16), wherein the arc-shaped opening (16) is arranged on the side of the coolant outflow direction, and the double-layer metal sheet (15) is provided with an arc-shaped crack (17), wherein the arc-shaped crack (17) is arranged on the side of the coolant inflow direction, and the arc-shaped crack (17) divides the double-layer metal sheet (15) into arc-shaped sheets (18); The arc-shaped sheet (18) bends in a direction away from the arc-shaped groove (14) when heated, and the coolant flows into the arc-shaped groove (14) from below the arc-shaped sheet (18) and flows out of the arc-shaped groove (14) from the arc-shaped opening (16).

2. The motor cooling system according to claim 1, characterized in that: A snap-on end (11) is provided at the edge of the spiral partition (6), and a spiral groove (12) is provided on the inner wall of the liquid cooling housing (7). The pitch of the spiral groove (12) is the same as the pitch of the spiral partition (6), and the spiral groove (12) and the snap-on end (11) cooperate with each other.

3. The motor cooling system according to claim 1, characterized in that: An engaging groove (19) having the same shape as the double-layer metal sheet (15) is provided at the opening of the arc-shaped groove (14), and the double-layer metal sheet (15) is installed in the engaging groove (19).

4. The motor cooling system according to claim 3, characterized in that: The engaging groove (19) is provided with claws (20) around it for fixing the double-layer metal sheet (15).

5. The motor cooling system according to claim 1, characterized in that: A liquid separator (21) is provided in the middle of the spiral cooling channel (8), a liquid inlet cavity (22) is provided between the liquid inlet pipe (10) and the cooling shell, the liquid inlet cavity (22) is respectively connected to the spiral cooling channels (8) located on both sides of the liquid separator (21), and the coolant in the spiral cooling channels (8) located on both sides of the liquid separator (21) flows in opposite directions.

6. The motor cooling system according to claim 1, characterized in that: The material of the upper metal sheet is nickel, and the material of the lower metal sheet is aluminum.

7. The motor cooling system according to claim 1, characterized in that: The left end surface of the motor housing (1) is provided with a sealing ring 1 (23), the left end of the liquid cooling housing (7) is sealedly connected to the sealing ring 1 (23), the right end of the liquid cooling housing (7) is provided with a sealing ring 2 (24), and the right end of the motor housing (1) is sealedly connected to the sealing ring 2 (24).

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