Cooling water jacket of generator stator and motor

Abstract

The utility model relates to a cooling water jacket of a generator stator and a motor, the cooling water jacket is used for cooling and radiating the generator stator, the cooling water jacket is of a hollow annular structure and surrounds the periphery of the generator stator, the cooling water jacket comprises cooling rings, a connecting part, a cooling channel, a liquid inlet part and a liquid outlet part, the cooling rings are coaxially arranged at intervals, and the connecting part is connected with the cooling channel. The connecting parts are used for connecting the adjacent cooling rings and locally form an H-shaped structure; and the cooling channel is formed in the cooling water jacket and extends into all the cooling rings and the connecting part. According to the scheme, the cooling rings and the connecting parts are arranged, and the adjacent cooling rings are connected through the connecting parts, so that the internal cooling channels of the whole cooling water jacket can penetrate through the cooling rings and the connecting parts, the cooling channels extend into the whole extending range of the cooling water jacket, and therefore the transverse area of the cooling channels is enlarged; the cooling area of the cooling channel on the motor stator is increased, and the cooling effect of the cooling channel on the motor stator is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of generator cooling, in particular to a cooling water jacket for a generator stator and an electric machine. Background Art

[0002] The new energy vehicle power system has put forward higher requirements for the permanent magnet synchronous motor itself in terms of power density, efficiency, lightweight, etc. An electric machine is a device that converts electrical energy into mechanical energy. According to the law of conservation of energy, there must be energy loss in this process, and this part of the loss is usually dissipated in the form of heat. The existing water jacket structure has the problem of poor heat dissipation effect.

[0003] During the development process, after the construction of the motor heat dissipation simulation model, the shape of the water jacket of the motor housing will be studied and analyzed to find the most economical and practical water jacket channel. Summary of the Utility Model

[0004] Based on this, a cooling water jacket for a generator stator and an electric machine are provided to improve the problem of poor heat dissipation effect of the water jacket in the prior art.

[0005] On the one hand, the utility model provides a cooling water jacket for a generator stator. The cooling water jacket is used for cooling and dissipating heat from the generator stator. The cooling water jacket is in a hollow annular structure and surrounds the outer periphery of the generator stator. The cooling water jacket includes:

[0006] Cooling rings, the cooling rings are in a circular ring shape, and the cooling rings are arranged at intervals and coaxially;

[0007] Connection parts, the connection parts are used to connect adjacent cooling rings and form an H-shaped structure locally;

[0008] Cooling channels, the cooling channels are formed inside the cooling water jacket, and the cooling channels extend into all the cooling rings and connection parts;

[0009] Liquid inlet part,

[0010] Liquid outlet part, the liquid inlet part and the liquid outlet part are fixed on different cooling rings, and both the liquid inlet part and the liquid outlet part are communicated with the cooling channels.

[0011] On the basis of the above technical solutions, the utility model can also be improved as follows.

[0012] In one implementation, the multiple cooling rings are arranged at equal intervals along the axial direction.

[0013] In one implementation, both the liquid inlet part and the liquid outlet part are in a cylindrical convex structure.

[0014] In one implementation, the liquid inlet part and the liquid outlet part protrude from the outer wall on the same side of the cooling water jacket.

[0015] In one implementation, the liquid inlet part and the liquid outlet part are respectively fixed on two cooling rings located at the axial two ends of the cooling water jacket.

[0016] In one implementation, a threaded structure is provided on the inner wall or the outer wall of the liquid inlet part and the liquid outlet part.

[0017] In one implementation, the cross section of the cooling ring is rectangular.

[0018] In one implementation, there are four cooling rings and three connecting parts, and the angular difference between adjacent connecting parts is 180°.

[0019] On the other hand, the present utility model further provides a motor, including a cooling water jacket of a generator stator. The motor further includes:

[0020] A motor housing, the cooling water jacket is fixed on the motor housing by welding, or the cooling water jacket and the motor housing are integrally formed by casting;

[0021] A generator stator, the outer periphery of the generator stator is surrounded by the cooling water jacket with interference fit.

[0022] In one implementation, the motor further includes:

[0023] A liquid inlet pipe, the liquid inlet pipe is connected to the liquid inlet part through a threaded structure;

[0024] A liquid outlet pipe, the liquid outlet pipe is connected to the liquid outlet part through a threaded structure.

[0025] The beneficial effects of the present utility model are as follows: By providing cooling rings, multiple cooling rings can ensure the circumferential surrounding area of the generator stator and ensure the circumferential structural strength of the cooling water jacket; by providing connecting parts, the connecting parts are used to connect adjacent cooling rings, avoiding the structure of the present application, such as a spiral water jacket, being easily deformed radially and axially. That is, the structure connected by the connecting parts and the cooling rings strengthens the structural strength of the cooling water jacket. At the same time, the internal cooling channels of the entire cooling water jacket can penetrate through the cooling rings and the connecting parts, so as to extend the cooling channels to the entire extension range of the cooling water jacket, thereby expanding the lateral area of the cooling channels, increasing the cooling area of the cooling channels for the motor stator, and improving the cooling effect of the cooling channels on the motor stator; in addition, a liquid inlet part and a liquid outlet part are also provided. The liquid inlet part is used to introduce the coolant into the cooling channels, and the liquid outlet part is used to discharge the coolant in the cooling channels, thereby forming a cooling loop, facilitating heat exchange with the motor stator to reduce the temperature of the motor stator. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the cooling water jacket of the generator stator in an embodiment;

[0027] Figure 2 is Figure 1 a partial sectional view;

[0028] Figure 3 is Figure 1 a schematic structural view of the cooling water jacket of the generator stator from another angle.

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0030] 1. Cooling ring; 2. Connecting part; 3. Liquid inlet part; 4. Liquid outlet part. Specific embodiments

[0031] In order to make the purpose, technical solutions and advantages of the present application more clear and understandable, the following further details the present application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] A cooling water jacket for a generator stator, see Figure 1 and Figure 3 , the cooling water jacket is used to cool and dissipate heat from the generator stator. The cooling water jacket is in a hollow annular structure and surrounds the outer periphery of the engine stator. The cooling water jacket includes a cooling ring 1, a connecting part 2, a cooling channel, a liquid inlet part 3 and a liquid outlet part 4. The cooling ring 1 is in a circular ring shape, and the cooling rings 1 are arranged at intervals and coaxially. The connecting part 2 is used to connect adjacent cooling rings 1 and forms an H-shaped structure locally; the cooling channel is formed inside the cooling water jacket and extends into all the cooling rings 1 and the connecting part 2; the liquid inlet part 3 and the liquid outlet part 4 are fixed on different cooling rings 1, and both the liquid inlet part 3 and the liquid outlet part 4 are communicated with the cooling channel.

[0033] With the above solution, by setting the cooling ring 1, multiple cooling rings 1 can ensure the circumferential surrounding area of the generator stator and ensure the circumferential structural strength of the cooling water jacket; by setting the connecting part 2, the connecting part 2 is used to connect adjacent cooling rings 1, avoiding the radial and axial deformation of the structure of the present application like a spiral water jacket, that is, the structure connected by the connecting part 2 and the cooling ring 1 strengthens the structural strength of the cooling water jacket, and at the same time enables the internal cooling channel of the entire cooling water jacket to penetrate through the cooling ring 1 and the connecting part 2, so as to extend the cooling channel to the entire extension range of the cooling water jacket, thereby expanding the lateral area of the cooling channel to increase the cooling area of the cooling channel for the motor stator and improving the cooling effect of the cooling channel on the motor stator; in addition, a liquid inlet part 3 and a liquid outlet part 4 are also provided. The liquid inlet part 3 is used to introduce the coolant into the cooling channel, and the liquid outlet part 4 is used to export the coolant in the cooling channel, thereby forming a cooling circuit, facilitating heat exchange with the motor stator to reduce the temperature of the motor stator.

[0034] This application can also compare the cooling water jacket of this application with the structures of other cooling water jackets through simulation, and a corresponding thermal analysis simulation model can be constructed, so as to obtain the corresponding temperature nephogram through simulation, thereby verifying the heat dissipation of the cooling water jacket structure of this application and obtaining the conclusion that the heat dissipation effect of the cooling water jacket of this application is better.

[0035] In some embodiments, referring to Figure 1 and Figure 3 , the plurality of cooling rings 1 are arranged at equal intervals along the axial direction. In this way, the cooling rings 1 are evenly spaced, so that the structural strength of the cooling water jacket is evenly distributed.

[0036] In some embodiments, referring to Figure 1 and Figure 3 , both the liquid inlet part 3 and the liquid outlet part 4 are cylindrical convex structures. In this way, by setting the liquid inlet part 3 and the liquid outlet part 4 as columnar convex structures, it is convenient to position the liquid inlet part 3 and the liquid outlet part 4, and it is also convenient to connect the liquid inlet part 3 and the liquid outlet part 4 with the corresponding liquid inlet pipe and liquid outlet pipe.

[0037] In some embodiments, referring to Figure 1 and Figure 3 , the liquid inlet part 3 and the liquid outlet part 4 protrude from the outer wall on the same side of the cooling water jacket. In this way, by arranging the liquid inlet part 3 and the liquid outlet part 4 on the same side of the cooling water jacket, it is convenient for the setting and installation of the cooling water jacket structure.

[0038] In some embodiments, referring to Figure 1 and Figure 3 , the liquid inlet part 3 and the liquid outlet part 4 are respectively fixed on two cooling rings 1 located at the axial two ends of the cooling water jacket. In this way, by arranging the liquid inlet part 3 and the liquid outlet part 4 on different cooling rings 1, and the axial distance between the two cooling rings 1 is the farthest, it is beneficial for the coolant to flow in all the cooling rings 1, so as to facilitate heat exchange of the cooling water jacket and avoid the situation of local heat accumulation or too high temperature of the motor stator.

[0039] In some embodiments, referring to Figure 1 and Figure 3 , a threaded structure is provided on the inner wall or outer wall of the liquid inlet part 3 and the liquid outlet part 4. In this way, by setting the corresponding threaded structure, it is convenient to connect the liquid inlet part 3 and the liquid outlet part 4 with the liquid inlet pipe and the liquid outlet pipe. Specifically, the threaded structure can be provided on the inner wall or outer wall of the liquid inlet part 3 and the liquid outlet part 4.

[0040] In some embodiments, referring to Figure 1 and Figure 2, the cross-section of the cooling ring 1 is rectangular. In this way, with a rectangular cross-section, the internal volume of the cooling ring 1 is increased under the same volume, which is conducive to the passage of more cooling liquid, so as to increase the flow rate of the cooling liquid per unit time, thereby facilitating the improvement of the cooling effect of the cooling water jacket on the generator stator.

[0041] In some embodiments, refer to Figure 1 , Figure 2 and Figure 3 , there are four cooling rings 1 and three connecting parts 2, and the angular difference between adjacent connecting parts 2 is 180°. In this way, the specific number of the cooling rings 1 can be adjusted according to the specific usage scenario. The number of the cooling rings 1 is not limited to four, and the number of the connecting parts 2 is not limited to three either. However, the number of the connecting parts 2 is at least one less than the number of the cooling rings 1, so as to enable the connecting parts 2 to successfully connect different cooling rings 1. In specific use, at least one connecting part 2 is connected between two adjacent cooling rings 1, but multiple connecting parts 2 can also be arranged between two adjacent cooling rings 1. The specific number of the connecting parts 2 can be adjusted according to the usage scenario and the cooling requirements.

[0042] A motor includes a cooling water jacket for a generator stator. The motor further includes a motor housing and a generator stator. The cooling water jacket is fixed to the motor housing by welding, or the cooling water jacket and the motor housing are integrally formed by casting. The outer periphery of the generator stator is surrounded by the cooling water jacket in an interference fit manner. In this way, the cooling water jacket surrounds the generator stator, and the cooling water jacket and the generator stator are in an interference connection state to ensure close contact between the cooling water jacket and the generator stator, thereby improving the cooling effect on the generator stator.

[0043] In some embodiments, the motor further includes a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe is connected to the liquid inlet part 3 through a threaded structure, and the liquid outlet pipe is connected to the liquid outlet part 4 through a threaded structure. In this way, the liquid inlet pipe and the liquid inlet part 3 are connected through a threaded matching structure, and the liquid outlet pipe and the liquid outlet part 4 are also connected through a threaded matching structure.

[0044] For the design process of the structure of the cooling water jacket of the present application, the cooling water jacket of the present application can be compared with a comparative water jacket with a similar flow channel volume. Specifically: the volume of the cooling water jacket of the present application and at least one comparative water jacket is set to 2.5×10 -4 m 3, and use the same area of ​​the end of the liquid inlet 3 and the liquid outlet 4, set the initial temperature to 298.15K, and set the flow rate at the liquid inlet 3 to 0.5m / s. Since the Reynolds numbers are all greater than 2300, the k-eps il on model is used to realize the scheme comparison. At least two schemes are brought into the thermal simulation model. When four comparative analyses are performed, the annular cooling water jacket, spiral comparative water jacket, S-shaped comparative water jacket, and H-shaped comparative water jacket of the present application can be used. The cooling water channel of each water jacket is similar to the outer surface structure of the water jacket, so that the water jacket is a thin-walled structure; obtain the motor overall temperature oblique cloud map, the motor overall temperature side cloud map, the motor water jacket temperature cloud map, the motor water channel temperature cloud map, the motor winding temperature cloud map, the motor stator temperature cloud map and the motor water channel pressure map. By comparison, it can be seen that the spiral channel has the best heat dissipation effect, but under the condition of the spiral pipeline, the maximum temperature of the motor is about 5-10K lower than that of other schemes, but at this time the pressure of the cooling medium is relatively large, and there are certain requirements on the dynamic performance of the pump; the heat dissipation effects of the S-shaped channel and the H-shaped channel are basically similar, the only difference is that the cooling medium pressure is slightly different, but the performance is not obvious; the circular pipeline is opposite to the spiral shape, and this cooling method has a lower cooling medium pressure, but it does not perform well in terms of heat dissipation, and the maximum temperature is 5-10K higher than other schemes; therefore, considering the heat dissipation efficiency and water pressure comprehensively, the ring-mounted H-shaped channel of the present application is more suitable for the actual heat dissipation of the motor.

[0045] For the design process of the cross-sectional shape of the cooling water jacket of the present application, the first cross-sectional shape of the present application can be compared with the second cross-sectional shape of the comparative water jacket. The shape of the second cross-sectional shape can be a regular trapezoid, an inverted trapezoid, etc. Different shapes have been verified. When the upper and lower sides of the cross-sectional shape use similar parameters, the pressure drop and heat dissipation effect can be better balanced. Finally, the 20 / 20 design scheme is selected. Among them, the upper and lower sides correspond to the inner wall and outer wall of the cooling ring 1 of the cooling water jacket.

[0046] In addition, the thermal analysis simulation model can be used to obtain the motor temperature distribution cloud map and fluid pressure cloud map at different high flow rates through simulation. The appropriate cooling water flow rate can be obtained through analysis, and the appropriate cooling water flow rate can be selected according to the comprehensive situation of the heat dissipation effect. In addition, the thermal simulation analysis can also be used to determine whether to select water or oil for cooling.

[0047] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0048] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions under which the present utility model can be implemented. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0049] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0050] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0051] In the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "join", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0052] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0053] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0054] The above-described embodiments merely represent several implementation manners of the present application, and the description thereof is relatively specific and detailed, but should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A cooling water jacket for a generator stator, the cooling water jacket is used to cool and dissipate heat for the generator stator, characterized in that: The cooling water jacket is a hollow annular structure and surrounds the outer circumference of the generator stator. The cooling water jacket includes: A cooling ring (1), wherein the cooling ring (1) is in a circular ring shape, and the cooling rings (1) are spaced apart and coaxially arranged; A connecting portion (2), the connecting portion (2) being used to connect adjacent cooling rings (1) and locally forming an H-shaped structure; A cooling channel, wherein the cooling channel is formed inside the cooling water jacket, and the cooling channel extends into all of the cooling rings (1) and the connecting portion (2); Liquid inlet (3), The liquid outlet portion (4), the liquid inlet portion (3) and the liquid outlet portion (4) are fixed on different cooling rings (1), and the liquid inlet portion (3) and the liquid outlet portion (4) are both connected to the cooling channel.

2. The cooling water jacket of the generator stator according to claim 1, characterized in that: The plurality of cooling rings (1) are arranged at equal intervals along the axial direction.

3. The cooling water jacket of the generator stator according to claim 1, characterized in that: The liquid inlet portion (3) and the liquid outlet portion (4) are both cylindrical protruding structures.

4. The cooling water jacket of the generator stator according to claim 1, characterized in that: The liquid inlet portion (3) and the liquid outlet portion (4) protrude along the outer wall of the same side of the cooling water jacket.

5. The cooling water jacket of the generator stator according to claim 1, characterized in that: The liquid inlet (3) and the liquid outlet (4) are respectively fixed on two cooling rings (1) located at two axial ends of the cooling water jacket.

6. The cooling water jacket of the generator stator according to claim 1, characterized in that: The inner wall or the outer wall of the liquid inlet portion (3) and the liquid outlet portion (4) is provided with a thread structure.

7. The cooling water jacket of the generator stator according to claim 1, characterized in that: The cross section of the cooling ring (1) is rectangular.

8. The cooling water jacket of the generator stator according to claim 1, characterized in that: The cooling rings (1) are four, the connecting parts (2) are three, and the angle difference between adjacent connecting parts (2) is 180°.

9. A motor, characterized in that: The motor comprises a cooling water jacket of a generator stator as claimed in any one of claims 1 to 8, and further comprises: A motor housing, the cooling water jacket is fixed to the motor housing by welding, or the cooling water jacket and the motor housing are integrally formed by casting; A generator stator, the outer periphery of which is interference surrounded by the cooling water jacket.

10. The motor according to claim 9, characterized in that The motor also includes: A liquid inlet pipe, the liquid inlet pipe being connected to the liquid inlet portion (3) via a threaded structure; A liquid outlet pipe, wherein the liquid outlet pipe is connected to the liquid outlet portion (4) via a threaded structure.

Images