A motor cooling structure

Abstract

The utility model discloses a motor cooling structure relates to cooling equipment technical field, and the motor cooling structure includes: shell, inner tube is located the inside of shell and can form the interstice of circulation between both, flow ring, at least two flow rings are along the axial interval and are located in the interstice of circulation, and the inboard and the outboard of flow ring are connected to the outboard wall of inner tube, the inboard wall of shell respectively, form the flow cavity between two adjacent flow rings, and the side of flow ring is close to inner tube is equipped with a plurality of flow grooves, and the flow groove of each flow ring corresponds and is set up relative to the axis direction of flow ring inclination, to can guide the spiral flow of cooling liquid in its corresponding flow cavity. The motor cooling structure, ensure that the cooling water shows spiral flow through the design flow ring, promote the uniformity of cooling water distribution, reduce the pressure loss along the way, reduce the processing difficulty, easily carry out structural adjustment.

Description

Technical Field

[0001] This utility model relates to the field of cooling equipment technology, and more specifically, to a motor cooling structure. Background Technology

[0002] Common motor cooling methods include air cooling, water cooling, oil cooling, and hybrid cooling. The cooling method selected varies depending on the motor's structure, temperature rise, and application. Water cooling utilizes the high specific heat capacity of water. Cooling water channels are arranged in slots inside the motor housing, allowing cooling water to flow in from the inlet, circulate within the housing, and then flow out from the outlet, carrying away the heat generated by the motor.

[0003] In related technologies, spiral water channels are distributed around the circumference of the motor to ensure cooling effect. The forming process of the spiral water channels is complex and usually requires turning / milling, roll forming or integral casting. The processing and production are difficult and cannot be adjusted.

[0004] In summary, how to provide a cooling method that is simple to process and easy to adjust is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a motor cooling structure that is simple to manufacture and can be adjusted according to requirements, thus offering high flexibility.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An electric motor cooling structure, comprising:

[0008] shell;

[0009] An inner cylinder is located inside the outer shell, and a flow gap can be formed between the two.

[0010] At least two of the flow guide rings are axially spaced within the flow gap, with the inner and outer sides of the flow guide rings respectively connected to the outer side wall of the inner cylinder and the inner side wall of the outer shell.

[0011] A flow guide cavity is formed between two adjacent flow guide rings. The flow guide rings are provided with multiple flow guide grooves on the side near the inner cylinder. The flow guide grooves corresponding to each flow guide ring are inclined relative to the axial direction of the flow guide ring so as to guide the coolant to form a spiral flow in its corresponding flow guide cavity.

[0012] Preferably, the guide ring includes a plurality of guide blocks connected in sequence, with the tail end of one of two adjacent guide blocks connected to the head end of the other.

[0013] Preferably, multiple flow guide blocks are welded together to form the flow guide ring.

[0014] Preferably, the number of guide grooves corresponding to the guide rings located near the outlet position is greater than the number of guide grooves corresponding to the guide rings located at other positions.

[0015] Preferably, the outer casing has an inlet and an outlet on each side of its axial direction, the inlet and the outlet are connected to the flow gap, and the distance between the inlet and the outlet is greater than or equal to 90% of the axial height of the outer casing.

[0016] Preferably, the number of guide grooves provided on the guide ring gradually increases along the direction close to the outlet.

[0017] Preferably, a plurality of the flow guide rings are equally spaced within the flow gap, and the flow guide rings are evenly distributed with a plurality of flow guide grooves communicating with the flow guide cavity.

[0018] Preferably, the multiple guide grooves corresponding to the same guide ring have the same inclination direction.

[0019] Preferably, the inclination directions of the guide grooves corresponding to two adjacent guide rings are opposite.

[0020] Preferably, the inclination direction of the guide grooves corresponding to two adjacent guide rings is the same.

[0021] The motor cooling structure provided by this utility model includes a shell, an inner cylinder, and guide rings. The inner cylinder is disposed inside the shell, and a flow gap is formed between the two. At least two guide rings are axially spaced within the flow gap. The inner and outer sides of the guide rings are respectively connected to the outer wall of the inner cylinder and the inner wall of the shell, so as to fix the guide rings relative to the flow gap. The specific spacing and number of guide rings can be adjusted according to actual needs to improve flexibility. A flow guiding cavity is formed between two adjacent guide rings, and the guide rings are close to the flow gap. The inner cylinder has multiple guide grooves on one side. Each guide groove corresponding to the guide ring is inclined relative to the axis of the guide ring, so as to guide the coolant to form a spiral flow in its corresponding guide cavity. The spiral flow of the coolant can generate high-intensity turbulence through the tangential momentum component, enhance the mixing of hot and cold media, and significantly improve the heat transfer coefficient. The spiral flow extends the contact path between the coolant and the heat-generating element, increases the heat convection time, and improves the heat transfer efficiency. The spiral flow channel has a smooth transition, uniform flow velocity distribution, and small pressure loss along the flow path, thus improving heat dissipation efficiency.

[0022] The beneficial effects of this utility model are as follows: by setting at least two guide rings assembled in the flow gap, the cooling structure can be flexibly adjusted according to the situation, which is convenient for processing. It can also ensure that the coolant flows in a spiral shape, improve the uniformity of cooling water distribution, reduce pressure loss along the flow path, and effectively cover the entire casing with cooling water, thereby achieving efficient cooling of the motor. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic cross-sectional view of the motor cooling structure provided by this utility model.

[0025] Figure 2 This is a schematic diagram showing the connection between the guide ring and the inner cylinder provided by this utility model.

[0026] Figure 3 A schematic diagram showing the connection between the guide ring and the outer shell provided by this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the guide ring provided by this utility model;

[0028] Figure 5 for Figure 4 A magnified view of a portion of region A in the middle;

[0029] Figure 6 This is a finite element fluid simulation diagram of the motor cooling structure provided by this utility model.

[0030] Figures 1-6 In the accompanying drawings, the reference numerals include:

[0031] 1-Outer shell; 2-Inner cylinder; 3-Inlet; 4-Outlet; 5-Guide ring; 6-Flow gap; 7-Guide cavity; 51-Guide block; 52-Guide groove. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] The core of this utility model is to provide a motor cooling structure. By setting at least two guide rings 5, the coolant can be spirally flowed directly through the guide grooves 52 set on the guide rings 5, which reduces the processing complexity, allows the structure to be adjusted according to actual needs, and reduces the cost of use.

[0034] This utility model provides a motor cooling structure, including a shell 1, an inner cylinder 2, and a guide ring 5. Please refer to the following for details. Figure 1 , Figure 2 , Figure 3 .

[0035] The outer shell 1 corresponds to the motor housing 1 part, and the inner cylinder 2 is located inside the outer shell 1 and a flow gap 6 can be formed between the two. Coolant can pass through the flow gap 6 to perform motor housing cooling.

[0036] At least two guide rings 5 ​​are axially spaced within the flow gap 6, with the inner and outer sides of the guide rings 5 ​​respectively connected to the outer side wall of the inner cylinder 2 and the inner side wall of the outer shell 1. The connection here can refer to a fitted connection, a detachable connection, or a combination connection.

[0037] The combination connection method is as follows: one side of the flow guide ring 5 is welded to the inner wall of the outer shell 1, and the other side is attached to the outer wall of the inner cylinder 2; or one side of the flow guide ring 5 is welded to the outer wall of the inner cylinder 2, and the other side is attached to the inner wall of the outer shell 1.

[0038] The above connection methods are merely simple examples and are not subject to excessive restrictions. As long as they can ensure the reliable installation of the guide ring 5 relative to the flow gap 6, they are acceptable.

[0039] In one embodiment, positioning areas for positioning and installing the guide rings 5 ​​can be provided on both the inner wall of the outer shell 1 and the outer wall of the inner cylinder 2, so as to ensure reliable and accurate installation of at least two guide rings 5. The positioning area can be in the form of positioning scale, positioning groove, positioning protrusion, positioning indicator diagram, etc., and is not limited.

[0040] A flow guide cavity 7 is formed between two adjacent flow guide rings 5. Multiple flow guide grooves 52 are provided on the side of the flow guide ring 5 near the inner cylinder 2. The flow guide groove 52 corresponding to each flow guide ring 5 is inclined relative to the axial direction of the flow guide ring 5 so as to guide the coolant to form a spiral flow in its corresponding flow guide cavity 7.

[0041] like Figure 4 , Figure 5As shown, the guide channel 52 is a through channel connected to the guide cavity 7. The specific inclination of the guide channel 52 can be determined by simulation and theoretical calculation. The inclined guide channel 52 generates a tangential momentum component, creating a spiral flow within the guide cavity 7. This spiral flow extends the contact path between the coolant and the heating element, increasing the heat convection time and enhancing the heat transfer efficiency between the coolant and the heating element, thus significantly improving the cooling effect. The heating element here refers to the electromagnetic components located inside the inner cylinder 2, such as the stator core, teeth, and winding ends. The guide channel 52 guides the flow path of the coolant to enhance heat dissipation and ensure reliable and effective cooling of the heating element.

[0042] Here, the guide groove 52 corresponding to each guide ring 5 refers to the multiple guide grooves 52 provided on each guide ring 5. And the correspondence of the coolant in its corresponding guide cavity 7 refers to the guide cavity 7 that is closest to the guide groove 52 along the flow direction of the coolant.

[0043] The multiple inclined guide grooves 52 on each guide ring 5 enable spiral flow to be formed in each guide cavity 7, ensuring reliable and efficient heat dissipation of the motor.

[0044] In this embodiment, multiple guide rings 5 ​​are set in the flow gap 6 between the outer shell 1 and the inner cylinder 2. The multiple guide rings 5 ​​are relatively independent and can be adjusted according to the actual situation, and can make the coolant flow in a spiral. The inclined guide groove 52 can generate high-intensity turbulence, enhance the exchange effect of hot and cold media, and improve heat dissipation efficiency.

[0045] In this embodiment, the guide groove 52 is a straight groove. When processing, the straight groove can be directly processed, which is simple to process and has no sharp turning area, and can reduce pressure loss along the flow path.

[0046] In this embodiment, the structural form of the multiple guide rings 5 ​​can be kept consistent. Specifically, the shape, inclination direction, and number of each guide groove 52 are all the same, so that they can be processed uniformly and the processing process can be simplified. In this way, the flow of coolant in each guide cavity 7 is consistent, ensuring the uniformity and reliability of cooling.

[0047] Based on the above embodiments, please refer to Figure 4 , Figure 5 The flow guide ring 5 includes a plurality of flow guide blocks 51 connected in sequence, with the tail end of one of two adjacent flow guide blocks 51 connected to the head end of the other.

[0048] The multiple guide blocks 51 can be of the same or different forms. For example, multiple guide blocks 51 can all be fan-shaped structures, which can be spliced ​​together to form a ring-shaped guide ring 5. Multiple guide blocks 51 can be connected in sequence to form an integral guide ring 5. The connection here can be achieved by welding or other detachable connection methods, as long as a reliable connection and fixation effect can be ensured.

[0049] For example, multiple guide blocks 51 are connected by fasteners. Each guide block 51 has protruding ears on both sides, with through holes on the ears. When two adjacent guide blocks 51 are joined together by the ears, their through holes are aligned, and a reliable connection is achieved by passing a fastener through the through hole. To further ensure that the guide blocks 51 do not move, limiting members perpendicular to the axis of the through hole can be set to limit movement from multiple directions, so as to cooperate with the fasteners to achieve a reliable connection.

[0050] Multiple flow guide blocks 51 are welded together to form a flow guide ring 5. The flow guide ring 5 is reliably fixed by welding to ensure its reliable performance.

[0051] In this embodiment, the fan-shaped curvature of two adjacent guide blocks 51 may be the same or different, depending on the form of the actual processed material.

[0052] By setting the guide block 51 as a fan-shaped structure, it is easier to process, reduces waste material, and lowers processing costs.

[0053] The flow guide block 51 has a compact structure that is easy to process. The material used in the flow guide block 51 can be processed from the processing waste of other structures, thereby improving the material utilization rate and further reducing the processing cost.

[0054] Based on any of the above embodiments, in two adjacent guide rings 5, the axial projection of the guide groove 52 corresponding to one guide ring 5 partially overlaps with or is completely offset from the axial projection of at least one guide groove 52 corresponding to the other. On the one hand, this prevents the coolant from directly entering the lower guide cavity 7 in its original tangential direction after leaving the upper guide cavity 7, forcing a change in circumferential flow direction. This abrupt change in flow direction generates transverse vortices and radial secondary flow at the interface of adjacent guide cavities 7, breaking the thermal boundary layer, significantly improving the local heat transfer coefficient, and increasing heat dissipation efficiency. On the other hand, by changing the position of the guide groove 52, heat dissipation efficiency can be effectively improved, ensuring maximum heat transfer gain with lower processing costs. Furthermore, the coolant can form a serpentine spiral trajectory, allowing the coolant to flow circumferentially on the outer wall of the inner cylinder 2, improving the heat dissipation effect.

[0055] Based on any of the above embodiments, please refer to Figure 1 , Figure 3The outer casing 1 has an inlet 3 and an outlet 4 on both sides of the axial direction. Both the inlet 3 and the outlet 4 are connected to the flow gap 6, and the distance between the inlet 3 and the outlet 4 is greater than or equal to 90% of the axial height of the outer casing 1, which ensures that the coolant flow area is maximized and sufficient to cover the winding end for effective heat dissipation.

[0056] Based on any of the above embodiments, the number of guide grooves 52 provided on the guide ring 5 near the outlet 4 position is greater than the number of guide grooves 52 provided at other positions. The other positions refer to the guide ring 5 at the inlet 3 position, and other guide rings 5 ​​besides those corresponding to the inlet 3 and outlet 4.

[0057] In one case, the number of guide grooves 52 of the guide ring 5 at other locations is the same and is less than the number of guide grooves 52 of the guide ring 5 at the outlet 4.

[0058] In one case, the number of guide grooves 52 on the guide rings 5 ​​at other locations is different. For example, it is divided into a first part close to the inlet 3 and a second part far from the inlet 3. The number of guide grooves on the guide rings corresponding to the first part is equal, and the number of guide grooves on the guide rings corresponding to the second part is equal. The number of guide grooves on the first part is less than the number of guide grooves on the second part, which is less than the number of guide grooves 52 on the guide rings 5 ​​at the outlet 4.

[0059] Through the above two methods, the coolant can flow quickly to outlet 4, rapidly carrying the heat out of the machine and ensuring the long-term stable and reliable operation of the motor.

[0060] Based on any of the above embodiments, the number of guide grooves 52 provided on the guide ring 5 gradually increases along the direction close to the outlet 4, so that the coolant can flow quickly to the outlet 4, quickly carry the heat out of the machine, and ensure the long-term stable and reliable operation of the motor.

[0061] Based on any of the above embodiments, please refer to Figure 1 , Figure 2 Multiple guide rings 5 ​​are equally spaced within the flow gap 6.

[0062] The spacing between multiple guide rings 5 ​​can be set according to actual conditions without limitation. Equal spacing can form guide cavities 7 of the same size, ensuring uniform heat dissipation and improving heat dissipation efficiency.

[0063] The guide ring 5 is provided with multiple guide grooves 52 that communicate with the guide cavity 7. The spacing of these grooves can be determined according to the actual situation without too many restrictions.

[0064] Based on any of the above embodiments, please refer to Figure 4 The multiple guide grooves 52 corresponding to the same guide ring 5 have the same inclination direction. For example... Figure 6 The diagram shown is a schematic of a finite element fluid simulation. Figure 6 It is evident that this configuration can maintain reliable circulation of coolant within each flow chamber 7, ensuring effective heat dissipation.

[0065] Furthermore, in this implementation, straight grooves can be directly machined during processing, which is simple and has no sharp turning areas, thus reducing pressure loss along the process.

[0066] Based on any of the above embodiments, the inclination directions of the guide grooves 52 corresponding to two adjacent guide rings 5 ​​are opposite. In this case, the alternating reverse vortex pairs formed by different rotation directions are used to improve the local heat transfer coefficient; the circumferential pressure between adjacent guide cavities 7 partially cancels out, which can suppress the high static pressure accumulated at the end of the conventional co-directional spiral flow, reduce the probability of water leakage between two adjacent guide rings 5, and improve system reliability; the reverse inclination causes the tangential sweep direction of the liquid flow against the wall to be reversed once every time it passes through a guide cavity 7; the high temperature zone is no longer fixed on the same generatrix, realizing 360° circumferential dynamic temperature uniformity, avoiding noise and air gap changes caused by uneven local thermal expansion.

[0067] Based on any of the above embodiments, please refer to Figure 2 , Figure 3 The inclination direction of the guide grooves 52 corresponding to two adjacent guide rings 5 ​​is the same.

[0068] In this method, the overall cooling channel of the cooling structure is equivalent to a segmented straight spiral. The coolant continues to accumulate circumferential momentum in each layer, the tangential velocity increases along the axial direction, the centrifugal force field is enhanced, the heat transfer coefficient is improved, and the heat dissipation effect is guaranteed.

[0069] In addition, in this way, the guide ring 5 can be formed using the same stamping die, and there is no need to check the direction mark during assembly, which can achieve low-cost mass production.

[0070] Through the above embodiments, the motor cooling structure provided by this utility model is designed with a guide ring 5 to make the coolant flow in a spiral shape. The spiral water flow can generate high-intensity turbulence through the tangential momentum component, which enhances the mixing of hot and cold media and significantly improves the heat transfer coefficient. The contact path between the coolant and the heat-generating element is extended, which increases the heat convection time and improves the heat transfer efficiency. The spiral flow channel has a smooth transition, uniform flow velocity distribution, and small pressure loss along the flow path, which improves the heat dissipation efficiency.

[0071] Please refer to Figure 6 , Figure 6 The colored contour lines in the graph represent the flow velocity. Figure 6 From this, we can conclude that:

[0072] 1. The color mark indicates a minimum speed > 0 m / s, which means that the coolant has a certain flow rate throughout the entire guide cavity 7, eliminating the cooling stagnation zone and ensuring the cooling effect.

[0073] 2. The red-orange band corresponding to the flow velocity above 0.75 m / s is closely attached to the inner wall of the outer shell 1 and the outer wall of the inner cylinder 2, which proves that the spiral component generated by the guide groove 52 continuously "throws" the high-speed fluid toward the wall, destroys the thermal boundary layer, and increases the heat transfer coefficient of the wall, so as to improve the uniformity of cooling water distribution and reduce pressure loss along the flow path.

[0074] 3. The streamlines are continuous and spiral-shaped, and advance along the axial direction to form a stepped spiral flow path, so that the same swirling effect can be obtained without continuously turning spiral grooves.

[0075] 4. The color transition is smooth along the same circumference, and the circumferential speed distribution is uniform, avoiding local hot spots.

[0076] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0077] The above provides a detailed description of the motor cooling structure provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A motor cooling structure, characterized in that, include: Outer shell (1); The inner cylinder (2) is located inside the outer shell (1) and a flow gap (6) can be formed between them; At least two of the guide rings (5) are axially spaced within the flow gap (6), and the inner and outer sides of the guide rings (5) are respectively connected to the outer side wall of the inner cylinder (2) and the inner side wall of the outer shell (1). A flow guide cavity (7) is formed between two adjacent flow guide rings (5). The flow guide ring (5) is provided with a plurality of flow guide grooves (52) on the side near the inner cylinder (2). The flow guide groove (52) corresponding to each flow guide ring (5) is inclined relative to the axial direction of the flow guide ring (5) so as to guide the coolant to form a spiral flow in its corresponding flow guide cavity (7).

2. The motor cooling structure according to claim 1, characterized in that, The guide ring (5) includes a plurality of guide blocks (51) connected in sequence, with the tail end of one of two adjacent guide blocks (51) connected to the head end of the other.

3. The motor cooling structure according to claim 2, characterized in that, Multiple flow guide blocks (51) are welded together to form the flow guide ring (5).

4. The motor cooling structure according to claim 1, characterized in that, The outer casing (1) has an inlet (3) and an outlet (4) on its two axial sides respectively. The inlet (3) and the outlet (4) are both connected to the flow gap (6), and the distance between the inlet (3) and the outlet (4) is greater than or equal to 90% of the axial height of the outer casing (1).

5. The motor cooling structure according to claim 4, characterized in that, The number of guide grooves (52) corresponding to the guide ring (5) located near the outlet (4) is greater than the number of guide grooves (52) corresponding to the guide ring (5) located at other positions.

6. The motor cooling structure according to claim 5, characterized in that, Along the direction close to the outlet (4), the number of the guide grooves (52) provided on the guide ring (5) gradually increases.

7. The motor cooling structure according to claim 1, characterized in that, Multiple flow guide rings (5) are equally spaced within the flow gap (6), and each flow guide ring (5) is provided with multiple flow guide grooves (52) that communicate with the flow guide cavity (7).

8. The motor cooling structure according to any one of claims 1 to 7, characterized in that, The multiple guide grooves (52) corresponding to the same guide ring (5) have the same inclination direction.

9. The motor cooling structure according to claim 8, characterized in that, The inclination directions of the guide grooves (52) corresponding to two adjacent guide rings (5) are opposite.

10. The motor cooling structure according to claim 8, characterized in that, The inclination direction of the guide grooves (52) corresponding to two adjacent guide rings (5) is the same.

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