Motor casing and motor

Abstract

The utility model provides a motor shell. The motor shell comprises an inner shell and an outer shell, a plurality of flow guide ribs extending in the circumferential direction are arranged on the outer surface of the inner shell to form a cooling water channel; the first end of the motor shell is provided with a water inlet and a water outlet; the cooling water channel comprises a first water channel and a second water channel; the first water channel communicates with the water inlet at the first end, and the second water channel communicates with the water outlet at the first end; the first water channel and the second water channel are communicated at the second end of the motor shell; the first water channels and the second water channels are alternately arranged in the axial direction; the inner surface of the outer shell is a conical surface; in the axial direction, the heights of the flow guide ribs are gradually increased in the inner diameter increasing direction of the inner surface of the outer shell. The utility model also provides a motor comprising the motor casing. The cooling and heat dissipation efficiency of the motor is improved, the assembly process of the motor is simplified, and the cost is saved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motors, and in particular to a motor casing and a motor comprising the motor casing. Background Art

[0002] With the development of new energy engineering machinery, the power density of motors is increasing. The increase in motor power density is accompanied by an increase in motor heat generation, which also puts higher and higher requirements on the motor's heat dissipation performance. For example, new energy engineering machinery, including new energy mining trucks used in mines, has higher requirements for motor power density. Whether the motor can effectively dissipate heat has become an important factor restricting the full performance of the motor.

[0003] However, motor heat dissipation has problems such as low heat exchange efficiency, high energy consumption, and complex structure, and cannot meet the efficient and energy-saving heat dissipation needs of high-performance motors. Utility Model Content

[0004] Embodiments of the present disclosure provide a motor casing and a motor including the motor casing.

[0005] In a first aspect, an embodiment of the present disclosure provides a motor casing, which comprises an inner casing and an outer casing; a plurality of guide ribs extending in a circumferential direction are arranged on the outer surface of the inner casing to constitute a cooling water channel; a water inlet and a water outlet are arranged at the first end of the motor casing; the cooling water channel comprises a first water channel and a second water channel; the first water channel is connected to the water inlet at the first end, and the second water channel is connected to the water outlet at the first end; the first water channel and the second water channel are connected at the second end of the motor casing; the first water channel and the second water channel are alternately arranged in the axial direction; the inner surface of the outer casing is a conical surface; in the axial direction, the height of the guide ribs increases gradually along the direction in which the inner diameter of the inner surface of the outer casing increases.

[0006] In some embodiments, the outer diameter surface of the guide rib is a conical surface, and the outer diameter surfaces of multiple guide ribs are on the same conical surface.

[0007] In some embodiments, the taper of the outer diameter surface of the guide rib ranges from 0° to 1°.

[0008] In some embodiments, the taper of the outer diameter surface of the guide rib is positively correlated with the length of the motor housing in the axial direction.

[0009] In some embodiments, the outer diameter surface of the guide rib is interference fit with the inner surface of the outer shell.

[0010] In some embodiments, in the axial direction, along the direction in which the inner diameter of the inner surface of the outer shell increases, the intervals between the guide ribs decrease gradually.

[0011] In some embodiments, the cross-sectional areas of the cooling water channel at different locations are consistent.

[0012] In some embodiments, the guide rib includes a guide portion and a transition portion; the circumferential extension direction of the guide portion is perpendicular to the axial direction; the extension direction of the transition portion intersects with the circumferential direction; and both ends of the transition portion are respectively connected to the guide portion.

[0013] In some embodiments, an extending direction of the transition portion is parallel to the axial direction, and the transition portion is smoothly connected to the guide portion.

[0014] In some embodiments, at least one first diverter rib is provided in the first water channel, and the first diverter rib is used to separate the portion of the first water channel close to the water inlet into multiple first sub-water channels; and / or, at least one second diverter rib is provided in the second water channel, and the second diverter rib is used to separate the portion of the second water channel close to the water outlet into multiple second sub-water channels.

[0015] In some embodiments, the water inlet and the water outlet are arranged on opposite sides of the first end; the second water channel includes an expansion portion connected to the water outlet, and at least one third diverter rib is arranged in the expansion portion.

[0016] In some embodiments, the plurality of third diverter ribs divide the expansion portion into a plurality of third sub-water channels, and the sum of the cross-sectional areas of the plurality of third sub-water channels is consistent with the cross-sectional area of ​​the cooling water channel.

[0017] In some embodiments, the inner shell body includes an inner cylindrical portion and an inner end cover portion arranged at one end of the inner cylindrical portion, and the inner cylindrical portion and the inner end cover portion are an integral structure; the outer shell body includes an outer cylindrical portion and an outer end cover portion arranged at one end of the outer cylindrical portion, and the outer cylindrical portion and the outer end cover portion are an integral structure; the inner end cover portion and the outer end cover portion are located at opposite ends of the motor casing.

[0018] In some embodiments, a first connection portion is provided at one end of the inner shell body close to the inner end cover portion, and a second connection portion is provided at one end of the outer shell body away from the outer end cover portion; the first connection portion and the second connection portion are fixedly connected by bolts.

[0019] In some embodiments, sealing rings are respectively provided at both ends of the outer surface of the inner cylindrical portion.

[0020] In a second aspect, an embodiment of the present disclosure provides a motor, comprising a motor housing, a stator, and a rotor, wherein the stator and the rotor are installed in the motor housing, and the motor housing is the motor housing described in the first aspect of the embodiment of the present disclosure.

[0021] In the disclosed embodiment, the cold / hot water channels in the motor casing are alternately arranged adjacent to each other, and the flow directions of the cooling liquid in the cold / hot water channels are opposite, so that the temperature difference of the cooling liquid always exists and is large, thereby improving the cooling efficiency; the inner and outer casings are interference fit through the conical structure, which greatly saves the assembly process cost, improves the production efficiency of the motor casing, reduces labor costs, and can also reduce the risk of water cross-talk between adjacent cooling water channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a motor housing in an embodiment of the present disclosure;

[0023] Figure 2 is a schematic structural diagram of another motor housing in an embodiment of the present disclosure;

[0024] Figure 3 is a structural schematic diagram of an inner shell in an embodiment of the present disclosure;

[0025] Figure 4 is a schematic diagram of a transition structure in an embodiment of the present disclosure;

[0026] Figure 5 This is a schematic diagram of a water channel structure in a countercurrent heat exchange form in this embodiment;

[0027] Figure 6 It is a schematic diagram of a unidirectional spiral parallel flow water exchange channel. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the technical solution of the present disclosure is described in detail below with reference to the accompanying drawings.

[0029] Example embodiments will be described more fully below with reference to the accompanying drawings, but the example embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete and to enable those skilled in the art to fully understand the scope of the present disclosure.

[0030] In the absence of conflict, the various embodiments of the present disclosure and the various features therein may be combined with each other.

[0031] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0032] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, the presence of the features, wholes, steps, operations, elements and / or components is specified, but the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof is not excluded.

[0033] The embodiments described herein may be described with reference to plan views and / or cross-sectional views by means of idealized schematic diagrams of the present disclosure. Therefore, the example illustrations may be modified according to manufacturing techniques and / or tolerances. Therefore, the embodiments are not limited to the embodiments shown in the accompanying drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the accompanying drawings have schematic properties, and the shapes of the regions shown in the figures illustrate the specific shapes of the regions of the elements, but are not intended to be limiting.

[0034] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted as having an idealized or overly formal meaning unless explicitly defined as such herein.

[0035] Figure 1 It is a schematic diagram of a motor housing in an embodiment of the present disclosure.

[0036] like Figure 1 As shown, the motor housing includes an inner housing 1 and an outer housing 2; a plurality of guide ribs 3 extending in the circumferential direction are arranged on the outer surface of the inner housing 1; the guide ribs 3 and the outer surface of the inner housing 1 and the inner surface of the outer housing 2 together constitute a cooling water channel; a water inlet and a water outlet are arranged at the first end of the motor housing; the cooling water channel includes a first water channel 4 and a second water channel 5; the first water channel 4 is connected to the water inlet at the first end, and the second water channel 5 is connected to the water outlet at the first end; the first water channel 4 and the second water channel 5 are connected at the second end of the motor housing; the first water channel 4 and the second water channel 5 are alternately arranged in the axial direction. For example, Figure 2 As shown, the first water channel 4 is composed of water channel 41, water channel 42, and water channel 43, and the second water channel 5 is composed of water channel 51, water channel 52, and water channel 53. Water channel 41, water channel 42, water channel 43 and water channel 51, water channel 52, and water channel 53 are arranged alternately.

[0037] like Figure 2As shown, the cooling liquid enters the cooling water channel from the water inlet, flows along the first water channel 4 to the second end of the motor housing; then the cooling liquid enters the second water channel 5 at the second end, flows along the second water channel 5 to the first end of the motor housing, and flows out from the water outlet; the flow directions of the cooling liquid in the first water channel 4 and the second water channel 5 are opposite, and the temperature of the cooling liquid in the first water channel 4 is lower than the temperature of the cooling liquid in the second water channel 5, forming a water channel structure in the form of countercurrent heat exchange. According to the principle of countercurrent heat exchange, the cold / hot water channels are arranged alternately adjacent to each other, and the flow directions of the cooling liquid in the cold / hot water channels are opposite, so that the temperature difference of the cooling liquid always exists and is large, thereby improving the cooling efficiency.

[0038] like Figure 1 As shown, the inner surface of the outer shell 2 is a conical surface, and in the axial direction, the height of the guide rib 3 increases along the direction in which the inner diameter of the inner surface of the outer shell 2 increases. In some embodiments, the outer diameter surface of the guide rib 3 arranged on the outer surface of the inner shell 1 is basically a conical surface as a whole. During assembly, the outer diameter surface of the guide rib 3 and the inner surface of the outer shell 2 are formed into an interference fit by applying pressure, and the assembly can be completed. There is no need to heat the outer shell 2 to a certain temperature to expand it, and then assemble the inner shell 1 into the outer shell 2, and there is no need to use stir friction welding to fix and seal the inner and outer shells, which greatly saves the assembly process cost, improves the production efficiency of the motor housing, and reduces labor costs; the outer diameter surface of the guide rib 3 is in close contact with the inner surface of the outer shell 2, and can also reduce the risk of water cross-talk between adjacent cooling water channels.

[0039] In some embodiments, Figure 1 As shown, the outer diameter surface of the guide rib 3 is a conical surface, and the outer diameter surfaces of multiple guide ribs are on the same conical surface. The conical surface matches the conical surface of the inner surface of the outer shell 2 in terms of size and taper. The inner surface of the outer shell 2 and the outer diameter surface of the guide rib 3 form a conical surface structure with a draft angle, making it easier to assemble the inner shell 1 and the outer shell 2. Setting the outer diameter surface of the guide rib 3 as a conical surface increases the matching area between the outer diameter surface of the guide rib 3 and the inner surface of the outer shell 2, which is conducive to reducing the interference stress between the guide rib 3 and the outer shell, and avoiding material yield failure.

[0040] In the embodiment of the present disclosure, the taper of the outer diameter surface of the guide rib 3 ranges from 0° to 1°; the taper of the inner surface of the outer shell 2 is consistent with the taper of the outer diameter surface of the guide rib 3, and the taper is also in the range of 0° to 1°. In some embodiments, the taper of the outer diameter surface of the guide rib 3 is 0.75°, and the taper of the inner surface of the outer shell 2 is 0.75°.

[0041] In the disclosed embodiment, the taper of the outer diameter surface of the guide rib 3 and the taper of the inner surface of the outer shell 2 can be set according to the axial length of the motor housing. In some embodiments, the taper of the outer diameter surface of the guide rib is positively correlated with the axial length of the motor housing. For example, the longer the length of the motor housing, the larger the taper of the outer diameter surface of the guide rib can be set.

[0042] like Figure 2 As shown, the inner shell 1 includes an inner cylindrical portion 11 and an inner end cover portion 12 arranged at one end of the inner cylindrical portion 11 . The inner cylindrical portion 11 and the inner end cover portion 12 are an integral structure, and the guide ribs 3 are arranged on the outer surface of the inner cylindrical portion 11 .

[0043] The outer shell 2 includes an outer cylindrical portion 21 and an outer end cover portion 22 provided at one end of the outer cylindrical portion 21 . The outer cylindrical portion 21 and the outer end cover 22 are an integral structure, and the inner surface of the outer cylindrical portion 21 is a conical surface.

[0044] After the inner housing 1 and the outer housing 2 are assembled, the inner end cover 12 and the outer end cover 22 are respectively located at two opposite ends of the motor housing.

[0045] In the disclosed embodiment, the inner housing 1 is an integrated structure integrating the inner cylindrical portion 11 and the inner end cover portion 12, and the outer housing 2 is an integrated structure integrating the outer cylindrical portion 21 and the outer end cover portion 22. During assembly, there is no need to use stir friction welding to fix and seal the inner and outer housings. The number of parts required for assembly is small, the number of assembly steps is small, and the reliability is higher. At the same time, the raw material cost and assembly cost of the motor casing can be reduced.

[0046] In the embodiment of the present disclosure, the outer diameter surface of the guide rib 3 is interference fit with the inner surface of the outer shell 2. Figure 1 As shown, a first connection portion is provided at one end of the inner shell 1 close to the inner end cover 12 , and a second connection portion is provided at one end of the outer shell 2 away from the outer end cover 22 ; the first connection portion and the second connection portion are fixedly connected by bolts 6 .

[0047] In some embodiments, Figure 1 As shown, sealing rings 7 are respectively provided at both ends of the outer surface of the inner cylindrical portion 11 .

[0048] Figure 3 It is a schematic diagram of an inner shell in an embodiment of the present disclosure.

[0049] like Figure 1 and Figure 3As shown, in the axial direction, along the direction in which the inner diameter of the inner surface of the outer shell 2 increases, the intervals between the guide ribs 3 on the inner shell 1 decrease. In some embodiments, along the direction in which the inner diameter of the inner surface of the outer shell 2 increases, the intervals between the guide ribs 3 on the inner shell 1 decrease, so that the cross-sectional areas of the cooling water channel at different positions are consistent. That is, the higher the height of the guide ribs 3, the smaller the intervals between adjacent guide ribs 3.

[0050] In the embodiment of the present disclosure, the cross-sectional areas of the cooling water channel at different positions are consistent, and the cross-sectional areas of the cooling water channel at various positions may be equal, or the cross-sectional areas of the cooling water channel at various positions may be similar, for example, the cross-sectional areas of the cooling water channel at various positions are similar within the error range. The embodiment of the present disclosure does not make any special limitation on this.

[0051] In the embodiments of the present disclosure, Figure 1 As shown, the height of the guide rib 3 increases from right to left, and the cross-section of the cooling water channel is trapezoidal. By adjusting the intervals between adjacent guide ribs 3 at different positions, the cross-sectional area of ​​the cooling water channel is made consistent, and the flow rate of the cooling liquid in the cooling water channel can be made uniform, thereby improving the temperature rise consistency of the entire motor housing.

[0052] In some embodiments, the wall thickness of the inner shell 1 remains consistent, which helps to ensure uniform heat dissipation.

[0053] In the embodiment of the present disclosure, the first water channel 4 and the second water channel 5 may form a standard double helix structure or a non-standard double helix structure, which is not particularly limited in the embodiment of the present disclosure.

[0054] A cooling water channel in the embodiment of the present disclosure is a non-standard double helix structure composed of a straight water channel and a transition structure.

[0055] like Figure 3 , Figure 4 As shown, the guide rib 3 includes a guide portion 31 and a transition portion 32; the extension direction of the guide portion 31 along the circumferential direction is perpendicular to the axial direction; the extension direction of the transition portion 32 intersects the circumferential direction; and both ends of the transition portion 32 are respectively connected to the guide portion 31.

[0056] In the disclosed embodiment, the guide portions 31 of the plurality of guide ribs 3 are parallel to each other and perpendicular to the axial direction, which is helpful in simplifying calculations and ensuring the consistency of the cross-sectional areas of the cooling water channels when designing and processing to make the cross-sectional areas of the cooling water channels consistent.

[0057] In the disclosed embodiment, a non-standard double helix structure consisting of a straight waterway and a transition structure is used instead of a waterway with a standard double helix structure, which is conducive to simplifying the mold demoulding process, increasing the bearing strength of the guide rib 3, and simplifying the manufacturing process. The transition structure is used between adjacent waterways for axial transition, which can not only reduce the number of parting molds, but also reduce the frequency of defects in the production process of the motor housing, and improve the yield rate of the motor housing production.

[0058] The embodiment of the present disclosure does not specifically limit the structure of the transition portion 32 .

[0059] like Figure 4 As shown, the extending direction of the transition portion 32 is parallel to the axial direction, and the transition portion 32 is smoothly connected to the flow guide portion 31 .

[0060] Figure 4 The transition portion 32 is shown as an axial vertical transition. In some embodiments, the transition portion 32 may also be a smooth transition structure, such as an axial inclined transition or an arc-shaped transition. The embodiments of the present disclosure do not specifically limit this.

[0061] In some embodiments, Figure 1 and Figure 3 As shown, at least one first diverter rib 81 is provided in the first water channel 4, and the first diverter rib 81 is used to divide the portion of the first water channel 4 close to the water inlet into a plurality of first sub-water channels.

[0062] In some embodiments, Figure 1 and Figure 3 As shown, at least one second diverter rib 82 is provided in the second water channel 5, and the second diverter rib 82 is used to separate the portion of the second water channel 5 close to the water outlet into a plurality of second sub-water channels.

[0063] In the disclosed embodiment, the guide ribs 3 at the water inlet and the water outlet are relatively low in height, resulting in a wider cooling water channel width at the water inlet and the water outlet. According to the principle of velocity gradient of the water flow cross section in fluid mechanics and the existence of kinematic viscosity, the flow velocity in the middle of the cooling water channel is the fastest and the flow velocity at the edge is the slowest. The portion of the first water channel 4 close to the water inlet is divided into a plurality of first sub-water channels, and / or the portion of the second water channel 5 close to the water outlet is divided into a plurality of second sub-water channels, which is conducive to a more uniform flow state and flow velocity of the cooling liquid and prevents the occurrence of local temperature unevenness due to the excessive width of the water channel in the structures at the water inlet and the water outlet.

[0064] In some embodiments, the water inlet and the water outlet are arranged on two opposite sides of the first end; the second water channel 5 includes an expansion portion 54 connected to the water outlet, and at least one third diverter rib 83 is arranged in the expansion portion 54.

[0065] In some embodiments, Figure 3As shown, a plurality of third diverting ribs 83 divide the expansion portion 54 into a plurality of third sub-water channels, and the sum of the cross-sectional areas of the plurality of third sub-water channels is consistent with the cross-sectional area of ​​the cooling water channel.

[0066] In a second aspect, an embodiment of the present disclosure provides a motor, comprising a motor housing, a stator, and a rotor, wherein the stator and the rotor are installed in the motor housing, and the motor housing is the motor housing described in the first aspect of the embodiment of the present disclosure.

[0067] In order to enable those skilled in the art to more clearly understand the technical solutions provided by the embodiments of the present disclosure, the technical solutions provided by the embodiments of the present disclosure are described in detail below through specific embodiments:

[0068] Example

[0069] Figure 5 This is a schematic diagram of a water channel structure of a countercurrent heat exchange form in this embodiment. The first water channel 4 is a cold water channel, and the second water channel 5 is a hot water channel.

[0070] According to the countercurrent heat exchange principle, the cold water temperature at the water inlet is 20°C, and the temperature difference of the cold water in the cold water channels spaced apart from each other is 2°C. Then the temperatures of the cold water in the cold water channels 41, 42, and 43 are 20°C, 22°C, and 24°C respectively.

[0071] The temperature of the returning hot water is 26°C, and the temperature difference of the hot water in the hot water channels spaced apart from each other is 2°C. Therefore, the temperatures of the hot water in the hot water channel 53, the hot water channel 52, and the hot water channel 51 are 26°C, 28°C, and 30°C respectively.

[0072] There is always a large temperature difference between the adjacent cold water channels and hot water channels, which makes the temperature of the motor casing more uniform and the heat exchange efficiency high.

[0073] Comparative Example

[0074] Figure 6 This is a schematic diagram of a unidirectional spiral parallel flow water exchange channel.

[0075] The cold water temperature at the water inlet is 20℃, and the temperature difference of cold water in adjacent water channels is 2℃. The water temperatures in each water channel are 20℃, 22℃, 24℃, 26℃, 28℃, and 30℃ respectively.

[0076] There are cold poles and hot poles in the motor casing, and the heat exchange efficiency is low.

[0077] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly noted, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the scope of the present disclosure as set forth in the appended claims.

Claims

1. A motor housing, characterized in that: The motor housing comprises an inner housing and an outer housing; A plurality of guide ribs extending in the circumferential direction are arranged on the outer surface of the inner shell to form a cooling water channel; The first end of the motor housing is provided with a water inlet and a water outlet; the cooling water channel includes a first water channel and a second water channel; the first water channel is connected to the water inlet at the first end, and the second water channel is connected to the water outlet at the first end; the first water channel and the second water channel are connected at the second end of the motor housing; the first water channel and the second water channel are alternately arranged in the axial direction; The inner surface of the outer shell is a conical surface; in the axial direction, the height of the guide rib increases along the direction in which the inner diameter of the inner surface of the outer shell increases.

2. The motor housing according to claim 1, characterized in that: The outer diameter surface of the guide rib is a conical surface, and the outer diameter surfaces of a plurality of the guide ribs are on the same conical surface.

3. The motor housing according to claim 2, characterized in that: The taper range of the outer diameter surface of the guide rib is 0° to 1°.

4. The motor housing according to claim 2, characterized in that: The taper of the outer diameter surface of the guide rib is positively correlated with the length of the motor housing in the axial direction.

5. The motor housing according to claim 2, characterized in that: The outer diameter surface of the guide rib is interference fit with the inner surface of the outer shell.

6. The motor housing according to claim 1, characterized in that: In the axial direction, along the direction in which the inner diameter of the inner surface of the outer shell increases, the intervals between the guide ribs decrease.

7. The motor housing according to claim 6, characterized in that: The cross-sectional areas of the cooling water channel at different positions are consistent.

8. The motor housing according to any one of claims 1 to 7, characterized in that: The guide rib comprises a guide portion and a transition portion; the extension direction of the guide portion along the circumferential direction is perpendicular to the axial direction; the extension direction of the transition portion intersects the circumferential direction; and both ends of the transition portion are respectively connected to the guide portion.

9. The motor housing according to claim 8, characterized in that: An extending direction of the transition portion is parallel to the axial direction, and the transition portion is smoothly connected to the flow guide portion.

10. The motor housing according to any one of claims 1 to 7, characterized in that: At least one first diverter rib is provided in the first water channel, and the first diverter rib is used to divide a portion of the first water channel close to the water inlet into a plurality of first sub-water channels; and / or At least one second diverter rib is disposed in the second water channel, and the second diverter rib is used to divide a portion of the second water channel close to the water outlet into a plurality of second sub-water channels.

11. The motor housing according to any one of claims 1 to 7, characterized in that: The water inlet and the water outlet are arranged on two opposite sides of the first end; the second water channel includes an expansion portion communicated with the water outlet, and at least one third diverter rib is arranged in the expansion portion.

12. The motor housing according to claim 11, characterized in that: The plurality of third diverter ribs divide the expansion portion into a plurality of third sub-water channels, and the sum of the cross-sectional areas of the plurality of third sub-water channels is consistent with the cross-sectional area of ​​the cooling water channel.

13. The motor housing according to any one of claims 1 to 7, characterized in that: The inner shell comprises an inner cylindrical portion and an inner end cover portion arranged at one end of the inner cylindrical portion, wherein the inner cylindrical portion and the inner end cover portion are an integral structure; The outer shell comprises an outer cylindrical portion and an outer end cover portion arranged at one end of the outer cylindrical portion, wherein the outer cylindrical portion and the outer end cover portion are an integral structure; The inner end cover portion and the outer end cover portion are located at two opposite ends of the motor housing.

14. The motor housing according to claim 13, characterized in that: A first connection portion is disposed at one end of the inner shell body close to the inner end cover portion, and a second connection portion is disposed at one end of the outer shell body away from the outer end cover portion; the first connection portion and the second connection portion are fixedly connected by bolts.

15. The motor housing according to claim 13, characterized in that: Sealing rings are respectively arranged at both ends of the outer surface of the inner cylindrical portion.

16. A motor, comprising a motor housing, a stator, and a rotor, wherein the stator and the rotor are installed in the motor housing, characterized in that: The motor housing is a motor housing according to any one of claims 1 to 15.

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