An electric motor, vehicle

Abstract

The application provides a motor and a vehicle, wherein the motor comprises a shell and a cooling box at the bottom of the shell, the cooling box comprises a heat conduction rib, an outer wall surface of the heat conduction rib is provided with a first channel, the first channel is used for flowing lubricating oil in the motor, the heat conduction rib is a hollow cavity structure, the cavity is a second channel, and cooling water flowing in the second channel can exchange heat with the lubricating oil flowing in the first channel. According to the application, the cooling box is used to replace the plate heat exchanger in the prior art to cool high-temperature lubricating oil, the cooling cost is reduced, meanwhile, the cooling box is arranged at the bottom of the motor shell, installation space is saved, the heat conduction rib is arranged in the cooling box, the internal space structure of the cooling box is divided into the first channel and the second channel, the cooling water in the second channel cools the lubricating oil in the first channel, and the cooling effect is met.

Description

Technical Field

[0001] This invention belongs to the field of compressor manufacturing technology, specifically relating to an electric motor and a vehicle. Background Technology

[0002] Currently, with the development of main drive motors for new energy vehicles, the demand for high-performance and high-efficiency motors is increasing. However, when a motor has high torque and high power density, it inevitably generates high heat, resulting in a high temperature rise and thus reducing the motor's service life. Therefore, the thermal performance of a motor has become one of the important factors restricting its performance.

[0003] As the power density of motors continues to increase, the demand for motor heat dissipation also increases. Currently, motor cooling technologies are generally divided into water cooling and oil cooling. Currently, oil cooling is used to cool motors. In the entire cooling cycle system, plate heat exchangers are generally used to cool the lubricating oil after the motor has cooled, which results in high lubricating oil cooling costs. Summary of the Invention

[0004] Therefore, the present invention provides an electric motor and a vehicle that can overcome the high cost of using plate heat exchangers to cool high-temperature lubricating oil in the prior art.

[0005] To address the aforementioned problems, the present invention provides an electric motor, including a housing and a cooling box located at the bottom of the housing. The cooling box includes heat-conducting ribs, and a first channel is provided on the outer wall of the heat-conducting ribs. The first channel is used for the flow of lubricating oil inside the electric motor. The heat-conducting ribs have a hollow cavity structure, and the cavity is a second channel. Cooling water flowing in the second channel can exchange heat with the lubricating oil flowing in the first channel.

[0006] In some implementations...

[0007] The cooling box has a bottom plate and a first vertical wall and a second vertical wall connected to and opposite to the bottom plate. The heat-conducting ribs are provided in multiple layers, and the length of the heat-conducting ribs extending from the first vertical wall to the second vertical wall is d. The minimum distance between the first vertical wall and the second vertical wall is D, where D>d.

[0008] In some implementations...

[0009] The heat-conducting rib connected to the first vertical wall is the first heat-conducting rib, and the heat-conducting rib connected to the second vertical wall is the second heat-conducting rib. The first heat-conducting rib and the second heat-conducting rib are staggered in a direction perpendicular to the base plate.

[0010] In some implementations...

[0011] The housing has a first water inlet and a second water inlet. On the projection surface of the housing along its axial direction, the cooling water entering through the first water inlet enters the first side of the cooling tank via a first axial water channel along a first rotation direction, and the cooling water entering through the second water inlet enters the second side of the cooling tank via a second axial water channel along a second rotation direction. The first side and the second side are arranged opposite to each other, and the first rotation direction is opposite to the second rotation direction.

[0012] In some implementations...

[0013] The cooling box also has a third vertical wall and a fourth vertical wall arranged opposite to each other to connect the first vertical wall and the second vertical wall. The third vertical wall forms a third channel with the first side of the heat-conducting rib, and the fourth vertical wall forms a fourth channel with the second side of the heat-conducting rib. The first axial water channel, the second axial water channel, the third channel, and the fourth channel are all connected to the second channel. The first side and the second side are arranged opposite to each other.

[0014] In some implementations...

[0015] The inner and outer walls of the heat-conducting ribs have multiple recesses and protrusions formed between adjacent recesses.

[0016] In some implementations...

[0017] The recesses on the inner wall of the heat-conducting rib are arranged opposite to the protrusions on the outer wall of the heat-conducting rib, and the recesses and protrusions are arranged sequentially.

[0018] In some implementations...

[0019] The longitudinal section of the cavity is elliptical.

[0020] In some implementations...

[0021] The cooling box also includes reinforcing ribs, which are disposed on the side of the heat-conducting ribs near the bottom plate.

[0022] In some implementations...

[0023] The cross-section of the reinforcing rib is cylindrical.

[0024] In some implementations...

[0025] The shell and the cooling box are integrally formed.

[0026] The present invention also provides a vehicle including the above-described motor.

[0027] This invention provides an electric motor and a vehicle. In the prior art, when the electric motor is cooled by oil, an external plate heat exchanger is required to exchange heat with the lubricating oil after cooling the motor in order to meet the cooling and circulation requirements of the lubricating oil and reduce the temperature of the lubricating oil. This results in high cooling costs. By using a cooling box instead of a plate heat exchanger, the cooling cost is reduced. At the same time, by placing the cooling box at the bottom of the motor housing, installation space is saved. In addition, heat-conducting fins are set inside the cooling box, and the internal space structure of the cooling box is divided into a first channel and a second channel. The cooling water in the second channel cools the lubricating oil in the first channel, thus achieving the desired cooling effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the motor housing structure according to an embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional view of the motor water inlet according to an embodiment of the present invention;

[0030] Figure 3 Embodiments of the present invention Figure 2 The left view;

[0031] Figure 4 This is a schematic diagram of the arrangement of heat-conducting fins inside the cooling box according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the motor housing and the water channel structure inside the cooling box according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the cooling tank oil passage structure according to an embodiment of the present invention.

[0034] The reference numerals in the attached figures are as follows:

[0035] 1. Shell; 11. First water inlet; 12. Second water inlet; 13. First axial water channel; 14. Second axial water channel; 2. Cooling tank; 21. Heat-conducting rib; 22. First vertical wall; 23. Second vertical wall; 24. Third vertical wall; 25. Fourth vertical wall; 26. Base plate; 27. Water outlet; 29. ​​Reinforcing rib; 3. Oil inlet; 4. Oil outlet; 5. Cooling water flow path inside the cooling tank; 6. Lubricating oil flow path inside the cooling tank. Detailed Implementation

[0036] See also Figures 1 to 6As shown, according to an embodiment of the present invention, an electric motor is provided, including a housing 1 and a cooling box 2 located at the bottom of the housing 1. The cooling box 2 includes heat-conducting ribs 21, and a first channel is provided on the outer wall of the heat-conducting ribs 21. The first channel is used for the flow of lubricating oil in the motor. The heat-conducting ribs 21 have a hollow cavity structure, and the cavity is a second channel. Cooling water flowing in the second channel can exchange heat with the lubricating oil flowing in the first channel. In the prior art, when the motor cooling method is oil cooling, in order to meet the cooling and circulation requirements of the lubricating oil, the motor needs to be connected to an external plate heat exchanger to exchange heat with the lubricating oil after cooling the motor, thereby reducing the temperature of the lubricating oil. The cooling cost is high. Using a cooling box 2 instead of a plate heat exchanger reduces the cooling cost. At the same time, by placing the cooling box 2 at the bottom of the motor housing 1, installation space is saved. In addition, the cooling box 2 is provided with heat-conducting ribs 21, which divides the internal space structure of the cooling box 2 into a first channel and a second channel. The cooling water in the second channel cools the lubricating oil in the first channel, thus achieving the desired cooling effect.

[0037] Preferably, the height of the heat-conducting fin 21 can be one-third of the height of the cooling box 2, which can avoid the generation of high fluid resistance.

[0038] In some embodiments, the cooling box 2 has a base plate 26 and a first vertical wall 22 and a second vertical wall 23 connected to and opposite to the base plate 26. The heat-conducting ribs 21 are provided in multiple layers, and the length of the heat-conducting ribs 21 extending from the first vertical wall 22 to the second vertical wall 23 is d. The minimum distance between the first vertical wall 22 and the second vertical wall 23 is D, where D>d. Designing the length of the heat-conducting ribs 21 along the lubricating oil flow direction to be less than the minimum distance between the first vertical wall 22 and the second vertical wall 23 can form a channel between the vertical walls and the heat-conducting ribs 21, facilitating the flow of lubricating oil through the channels formed by the multiple layers of heat-conducting ribs 21.

[0039] In some embodiments, the heat-conducting rib 21 connected to the first vertical wall 22 is a first heat-conducting rib, and the heat-conducting rib 21 connected to the second vertical wall 23 is a second heat-conducting rib. The first heat-conducting rib and the second heat-conducting rib are staggered in a direction perpendicular to the base plate 26, i.e., as shown in the figure. Figure 6 The heat-conducting ribs are arranged alternately on the left and right sides as shown. The first and second heat-conducting ribs are arranged alternately on the left and right sides in a direction perpendicular to the base plate 26. This allows the first channel formed by the multiple layers of heat-conducting ribs 21 to be connected in series, so that the lubricating oil runs along an S-shaped path to the oil outlet 4 of the cooling box 2. This can effectively increase the oil-water heat exchange area and improve the heat exchange efficiency.

[0040] In some embodiments, the housing 1 has a first water inlet 11 and a second water inlet 12. On the projection surface of the housing 1 along its axial direction, cooling water entering through the first water inlet 11 enters the first side of the cooling tank 2 via a first axial water channel 13 along a first rotation direction, and cooling water entering through the second water inlet 12 enters the second side of the cooling tank 2 via a second axial water channel 14 along a second rotation direction. The first side and the second side are arranged opposite to each other, and the first rotation direction is opposite to the second rotation direction. In existing motor water cooling processes, a single inlet and a single outlet are used. Cooling water enters through the inlet to cool the motor casing and then flows out through the outlet. This results in the inlet surface temperature being lower than the outlet surface temperature, leading to uneven stator core temperature and localized overheating. Two inlets divide the cooling water into two axial channels 13 and 14, respectively, cooling the casing and two opposite sides of the motor. The cooled water then converges through the two opposite sidewalls of the cooling tank 2 and finally flows out through the outlet at the bottom of the cooling tank 2. This ensures that both sides of the casing 1 are inlet surfaces, reducing the internal heat island effect of the motor, avoiding uneven cooling, and thus improving motor stability and service life. (See also...) Figure 2 As shown, the first rotation direction is clockwise along the shell, and the second rotation direction is counterclockwise along the shell.

[0041] In some embodiments, the cooling tank 2 further has a third vertical wall 24 and a fourth vertical wall 25 arranged opposite to each other to connect the first vertical wall 22 and the second vertical wall 23. The third vertical wall 24 forms a third channel with the first side of the heat-conducting rib 21, and the fourth vertical wall 25 forms a fourth channel with the second side of the heat-conducting rib 21. The first axial water channel 13, the second axial water channel 14, the third channel, and the fourth channel are all connected to the second channel. The first side and the second side are arranged opposite to each other. Cooling water enters the first inlet 11 and the second inlet 12 and is divided into two paths. One path enters the third channel along the first axial water channel 13 and merges into the second channel to cool the lubricating oil. The other path enters the fourth channel along the second axial water channel 14 and merges into the second channel to cool the lubricating oil. Finally, the cooling water after heat exchange flows out through the outlet 27. By arranging the cooling water flow paths in parallel, lower-temperature cooling water can be used to cool high-temperature lubricating oil, thereby extending the cooling time and improving heat exchange efficiency.

[0042] In some embodiments, the inner and outer walls of the heat-conducting rib 21 have multiple recesses and protrusions formed between adjacent recesses. By configuring both the inner and outer walls of the heat-conducting rib 21 with recesses and protrusions, it can guide or turbulent the flow of lubricating oil or cooling water inside and outside the heat-conducting rib 21. When the flow direction of the lubricating oil is the same as the guiding direction of the recess, it can guide the flow of the lubricating oil. When the flow direction of the lubricating oil is perpendicular to the guiding direction of the recess, it can turbulently move the lubricating oil, further improving the oil-water heat exchange capacity. The recess structure has the same effect on cooling water.

[0043] In some embodiments, the recesses on the inner wall of the heat-conducting rib 21 are arranged opposite to the protrusions on the outer wall of the heat-conducting rib 21, and the recesses and protrusions are staggered. Designing the recesses on the inner and outer walls of the heat-conducting rib 21 as an asymmetrical structure, i.e., the recesses on the outer wall of the heat-conducting rib 21 correspond to the protrusions on the inner wall, can increase the disturbance and improve the oil-water heat exchange efficiency. The periodic arrangement, i.e., the staggered arrangement of recesses and protrusions, can make the lubricating oil cool more uniformly, and at the same time, can reduce the wall thickness of the heat-conducting rib 21. Therefore, the cooling box 2 with the same heat exchange effect can be designed to be smaller, saving space.

[0044] In some embodiments, the longitudinal section of the cavity is elliptical. During the flow of lubricating oil or cooling water, there will be flow resistance. Considering the limitation of flow resistance, the cavity structure with an elliptical longitudinal section has better performance in terms of both disturbance to lubricating oil or cooling water and flow resistance than other structures.

[0045] In some embodiments, the cooling tank 2 further includes reinforcing ribs 29, which are disposed on the side of the heat-conducting ribs 21 near the base plate 26. Since both cooling water and lubricating oil require the heat-conducting ribs 21 to bear weight, the addition of reinforcing ribs 29 provides support for the heat-conducting ribs 21, making the structure more stable.

[0046] In some embodiments, the cross-section of the reinforcing rib 29 is cylindrical. The cylindrical reinforcing rib 29 structure can reduce the internal resistance of the flow channel and avoid excessive resistance.

[0047] In some embodiments, the housing 1 and the cooling box 2 are integrally formed. By integrally forming the cooling box at the bottom of the motor housing, installation space is saved. At the same time, during motor operation, the cooling box 2 is filled with lubricating oil or cooling water, and the sound is reduced in the water or oil. Therefore, this design can reduce the noise generated by the motor operation.

[0048] During motor operation, the high-temperature lubricating oil that cools the stator and coils collects in the cooling tank 2 at the bottom of the motor housing 1. It flows into the cooling tank 2 through the oil inlet 3, is cooled in the cooling tank 2, and then flows out through the oil outlet 4, returning to the motor interior to cool the stator and coils again. The motor housing 1 has two water inlets, and the cooling water is divided into two paths to cool the housing and the lubricating oil inside the motor, finally flowing out through the water outlet 27 at the bottom of the housing. During this process, the lubricating oil flow path 6 within the cooling tank is in series, while the cooling water flow path 5 is in parallel. This means that lower-temperature cooling water is used to exchange heat with the high-temperature lubricating oil. Simultaneously, the series structure further increases the oil-water heat exchange area, improving heat exchange efficiency.

[0049] The present invention also provides a vehicle including the above-described motor.

[0050] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An electric motor, characterized in that, The device includes a housing (1) and a cooling box (2) located at the bottom of the housing (1). The cooling box (2) includes a heat-conducting rib (21). The outer wall of the heat-conducting rib (21) is provided with a first channel for the flow of lubricating oil in the motor. The heat-conducting rib (21) has a hollow cavity structure, and the cavity is a second channel. The cooling water flowing in the second channel can exchange heat with the lubricating oil flowing in the first channel. The cooling box (2) is integrally formed at the bottom of the housing (1). An oil inlet (3) is provided at the bottom of the housing (1). The lubricating oil flows into the first channel of the cooling box (2) through the oil inlet (3). Inside, the cooling water that flows through the cooling tank (2) and the second channel after heat exchange returns to the interior of the shell (1); the shell (1) has a first inlet (11) and a second inlet (12). On the projection surface of the shell (1) along its axial direction, the cooling water entering through the first inlet (11) enters the first side of the cooling tank (2) through the first axial water channel (13) along the first rotation direction, and the cooling water entering through the second inlet (12) enters the second side of the cooling tank (2) through the second axial water channel (14) along the second rotation direction. The first side and the second side are arranged opposite to each other, and the first rotation direction is opposite to the second rotation direction. The cooling box (2) also has a third vertical wall (24) and a fourth vertical wall (25) arranged opposite to each other so as to connect the first vertical wall (22) and the second vertical wall (23). The third vertical wall (24) forms a third channel with the first side of the heat-conducting rib (21), and the fourth vertical wall (25) forms a fourth channel with the second side of the heat-conducting rib (21). The first axial water channel (13), the second axial water channel (14), the third channel, and the fourth channel are all connected to the second channel. The first side and the second side are arranged opposite to each other.

2. The motor according to claim 1, characterized in that, The cooling box (2) has a bottom plate (26) and a first vertical wall (22) and a second vertical wall (23) connected to and opposite to the bottom plate (26). The heat-conducting ribs (21) are provided in multiple layers, and the length of the heat-conducting ribs (21) extending from the first vertical wall (22) to the second vertical wall (23) is d. The minimum distance between the first vertical wall (22) and the second vertical wall (23) is D, where D>d.

3. The motor according to claim 2, characterized in that, The heat-conducting rib (21) connected to the first vertical wall (22) is the first heat-conducting rib, and the heat-conducting rib (21) connected to the second vertical wall (23) is the second heat-conducting rib. The first heat-conducting rib and the second heat-conducting rib are staggered in a direction perpendicular to the bottom plate (26).

4. The motor according to claim 1, characterized in that, The inner and outer walls of the heat-conducting rib (21) have multiple recesses and protrusions formed between two adjacent recesses.

5. The motor according to claim 4, characterized in that, The concave cavity on the inner wall of the heat-conducting rib (21) is arranged opposite to the protrusion on the outer wall of the heat-conducting rib (21), and the concave cavity and the protrusion are arranged sequentially.

6. The motor according to claim 5, characterized in that, The longitudinal section of the cavity is elliptical.

7. The motor according to claim 1, characterized in that, The cooling box (2) also includes a reinforcing rib (29), which is located on the side of the heat-conducting rib (21) near the bottom plate (26).

8. The motor according to claim 7, characterized in that, The cross-section of the reinforcing rib (29) is cylindrical.

9. A vehicle, characterized in that, The motor included in any one of claims 1 to 8.

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