Cooling device for an electric machine

Abstract

The application provides a cooling device of an electric machine, and belongs to the technical field of electric machine cooling. The cooling device of the electric machine solves the problem of excessive heat generation of the existing electric machine while improving the power density. The cooling device of the electric machine is arranged on the electric machine, and the cooling device comprises a cooling body, the cooling body is circumferentially and intervalled arranged with cooling channels which axially penetrate the cooling body, parallel flow devices are arranged between the cooling channels to make two adjacent cooling channels sequentially form cooling flow channels in parallel, one of the cooling channels is provided with a water inlet joint, and the other cooling channel is provided with a water outlet joint. The cooling device of the electric machine is suitable for the requirement of sufficient cooling of the electric machine, the cooling body is sleeved on the electric machine or directly used as the cooling channel which axially penetrates the shell of the electric machine, the cooling liquid in the cooling channel can be fully cooled and circulated in the electric machine, the cooling effect is better, and the load capacity of the electric machine is ensured.

Description

Technical Field

[0001] This invention belongs to the technical field of motor cooling, and relates to a motor cooling device. Background Technology

[0002] In existing car wash pumps, the motor dissipates heat through a motor cover via air. This requires dedicated vents on the motor cover to allow cooling fluid to enter the internal chamber. Furthermore, to balance the air pressure inside and outside the motor cover, a diaphragm is needed in the cooling path from the vents to the internal chamber, making the structure quite complex. Since car wash pumps typically rely on natural airflow for cooling, the airflow is not very efficient, resulting in ineffective motor cooling and impacting motor efficiency and lifespan.

[0003] Regarding motor cooling, some systems incorporate spiral cooling channels on the motor housing. However, these spiral channels often present the problem of axial arrangement of the inlet and outlet. This axial arrangement of the outlet creates a temperature gradient across the motor due to the temperature difference between the inlet and outlet, thus limiting the motor's load capacity. This water circuit design fails to address the issue of excessive heat generation in existing motors while simultaneously increasing power density. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the prior art by providing a motor cooling device with a simple structure, a reasonable water circuit design, and the ability to effectively cool the motor and reduce its load capacity due to excessive heat generation.

[0005] The objective of this invention can be achieved through the following technical solution: a cooling device for an electric motor, which is installed on the motor. The cooling device includes a cooling body, characterized in that the cooling body is circumferentially spaced with cooling channels that axially penetrate the cooling body. A parallel flow device is provided between the cooling channels to allow two adjacent cooling channels to flow in series to form a cooling flow channel. One cooling channel is provided with a water inlet connector, and the other cooling channel is provided with a water outlet connector.

[0006] The cooling device of this motor is mainly formed by extruding the cooling body as a whole. During the extrusion process, the cooling channel is formed, which greatly reduces the production cost. In actual manufacturing, the cooling channel is circumferentially arc-shaped and axially continuous. The purpose of this design is to increase the flow of the cooling channel and enhance the cooling effect of the cooling body. Water inlet and water outlet connectors are installed on the cooling channel. The purpose of this design is to enable the cooling channel to form an inlet and outlet circulation flow, and to achieve cooling circulation through the flow.

[0007] In the aforementioned motor cooling device, the cooling body has a cooling ring inside for cooling the motor, and cooling strips are provided on the cooling ring, with cooling channels penetrating the cooling strips. The separate molding of the cooling body and cooling ring allows the cooling body to expand and dissipate heat, thus increasing the cooling effect.

[0008] In the aforementioned motor cooling device, radially arranged cooling fins are located between the cooling strips and the cooling body. The purpose of this arrangement is to increase the heat dissipation area and achieve sufficient cooling.

[0009] In the aforementioned motor cooling device, the parallel flow device includes an upper U-shaped connecting elbow and a lower U-shaped connecting elbow. The upper U-shaped connecting elbow is connected to the upper end of the cooling bar, causing the cooling channels on the cooling bar to form pairs of upward connections. The lower U-shaped connecting elbow is connected to the lower end of the cooling bar, causing the cooling channels on the cooling bar to form pairs of downward connections. The upper and lower U-shaped connecting elbows are circumferentially offset, causing adjacent cooling channels to be connected in series to form the cooling flow channel. By connecting the upper and lower U-shaped connecting elbows on the cooling channels, all cooling channels can be connected and circulated, achieving the purpose of circulating cooling.

[0010] In the aforementioned motor cooling device, both the upper and lower U-shaped connecting elbows are equipped with insertion portions for connecting to the cooling channels on the cooling strip. Each insertion portion has one or more sealing rings embedded within it. When the upper and lower U-shaped connecting elbows are inserted into the cooling channels on the cooling strip, the sealing rings seal against the inner wall of the corresponding cooling channel, forming a sealed connection. This design facilitates the lifting of the cooling channels and ensures a better sealing connection between the upper and lower U-shaped connecting elbows and the cooling channels, guaranteeing the stability of coolant circulation within the cooling channels.

[0011] In the above-mentioned motor cooling device, the cooling device further includes an upper end plate and a lower end plate. The upper end plate is disposed above the cooling body, and the lower end plate is disposed below the cooling body. The upper end plate, the cooling body, and the lower end plate are axially fixedly connected by bolts.

[0012] By incorporating the motor's cooling device into the car wash pump, the pump acquires a water-cooling circulation mechanism, resulting in better motor cooling and extending the pump's motor lifespan. The pump's water-cooling circulation mechanism includes a pump body and a motor mounted on the pump body. A cooling body is fitted onto the motor within the pump body, and the cooling strips on this cooling body are in contact with the outer wall of the motor on the pump body. The pump body is equipped with an inlet and an outlet. The pump's inlet and the outlet connector on the cooling channel are connected via a water pipe. The inlet connector on the cooling channel is connected to an external water tap, allowing water to enter through the external tap, circulate through the cooling channel, and then be sprayed out from the outlet on the pump body.

[0013] Compared with existing technologies, the cooling device of this motor addresses the need for sufficient cooling by fitting a cooling body onto the motor or using the cooling body directly as an axially penetrating cooling channel within the motor housing. This allows the coolant in the cooling channel to circulate effectively within the motor, resulting in better cooling and ensuring the motor's load capacity. Furthermore, in the pump-water cooling circulation mechanism, the motor on the pump body is cooled by liquid, and after cooling, the water is directly circulated by the pump, with cold water entering and warm water exiting, further enhancing the motor's cooling effect. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the cooling device of this motor exploding on the motor.

[0015] Figure 2 This is a three-dimensional structural diagram of the explosion of the cooling device of this motor.

[0016] Figure 3 This is a three-dimensional structural diagram of the explosion of the cooling device of this motor.

[0017] Figure 4 This is a three-dimensional structural diagram of the motor cooling device used in the pump water cooling cycle.

[0018] In the diagram, 1. Motor; 2. Cooling body; 3. Cooling channel; 4. Water inlet connector; 5. Water outlet connector; 6. Cooling ring; 7. Cooling strip; 8. Cooling fins; 9. Upper U-shaped connecting elbow; 10. Lower U-shaped connecting elbow; 11. Insertion part; 12. Upper end plate; 13. Lower end plate; 14. Bolt; 15. Pump body; 16. Water inlet; 17. Water outlet. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] like Figure 1 , Figure 2 and Figure 3As shown, the cooling device of the motor 1 is installed on the motor 1. The cooling device includes a cooling body 2. There are two ways to make the cooling body 2. The first way is to make an external cooling body 2, which is installed outside the stator of the motor 1. The cooling body 2 can be cylindrical or square. The second way is to directly replace the housing of the motor 1 with the cooling body 2. The cooling body 2 is made of aluminum.

[0021] In actual production, the cooling body 2 is circumferentially spaced with cooling channels 3 that axially penetrate the cooling body 2. A parallel flow device is provided between the cooling channels 3 to allow two adjacent cooling channels 3 to flow in pairs to form a cooling flow channel. One cooling channel 3 is provided with a water inlet connector 4, and the other cooling channel 3 is provided with a water outlet connector 5.

[0022] In actual production, the specific structure is designed to increase heat dissipation: the cooling body 2 is equipped with a cooling ring 6 for cooling the motor 1, and a cooling strip 7 is provided on the cooling ring 6. The cooling channel 3 passes through the cooling strip 7. There are radially arranged cooling fins 8 between the cooling strip 7 and the cooling body 2.

[0023] In actual manufacturing, the specific implementation of this parallel flow device mainly consists of an upper U-shaped connecting elbow 9 and a lower U-shaped connecting elbow 10. The upper U-shaped connecting elbow 9 is connected to the upper end of the cooling bar 7, causing the cooling channels 3 on the cooling bar 7 to form pairs of upper connections; the lower U-shaped connecting elbow 10 is connected to the lower end of the cooling bar 7, causing the cooling channels 3 on the cooling bar 7 to form pairs of lower connections. The upper U-shaped connecting elbow 9 and the lower U-shaped connecting elbow 10 are circumferentially misaligned, causing adjacent cooling channels to connect. The cooling channels 3 are connected in series to form the cooling channels. The upper U-shaped connecting elbow 9 and the lower U-shaped connecting elbow 10 are each provided with a plug-in part 11 for connecting with the cooling channel 3 on the cooling strip 7. The plug-in part 11 is provided with two sealing rings by embedding with it. When the upper U-shaped connecting elbow 9 and the lower U-shaped connecting elbow 10 are inserted into the cooling channel 3 on the cooling strip 7, the sealing rings seal against the inner wall of the corresponding cooling channel 3 and form a sealed connection.

[0024] In actual assembly, the cooling device also includes an upper end plate 12 and a lower end plate 13. The upper end plate 12 is located above the cooling body 2, and the lower end plate 13 is located below the cooling body 2. The upper end plate 12, the cooling body 2, and the lower end plate 13 are axially fixedly connected by bolts 14.

[0025] like Figure 4As shown, the cooling device of motor 1 is used in the car wash pump, which gives the car wash pump a water cooling circulation mechanism. The car wash pump water cooling circulation mechanism includes a pump body 15 and a motor 1 installed on the pump body 15. A cooling body 2 is fitted on the motor 1 of the pump body 15. The cooling strips 7 on the cooling body 2 are in contact with the outer wall of the motor 1 on the pump body. The pump body 15 is provided with a water inlet 16 and a water outlet 17. The water inlet 16 of the pump body 15 and the water outlet connector 5 provided on the cooling channel 3 are connected by a water pipe. The water inlet connector 4 provided on the cooling channel 3 is connected to an external faucet. Water enters from the external faucet, circulates through the cooling channel 3, and is then sprayed out from the water outlet 17 provided on the pump body.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0027] Although this document frequently uses terms such as motor 1; cooling body 2; cooling channel 3; inlet connector 4; outlet connector 5; cooling ring 6; cooling strip 7; cooling fins 8; upper U-shaped connecting elbow 9; lower U-shaped connecting elbow 10; plug-in part 11; upper end plate 12; lower end plate 13; bolt 14; pump body 15; inlet 16; outlet 17, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A cooling device for an electric motor, disposed on an electric motor (1), the cooling device comprising a cooling body (2), characterized in that, The cooling body (2) is circumferentially spaced with cooling channels (3) that axially penetrate the cooling body (2). A parallel flow device is provided between the cooling channels (3) to allow two adjacent cooling channels (3) to flow in pairs to form a cooling flow channel. One cooling channel (3) is provided with a water inlet connector (4), and the other cooling channel (3) is provided with a water outlet connector (5).

2. The cooling device for an electric motor according to claim 1, characterized in that, The cooling body (2) is provided with a cooling ring (6) for cooling the motor (1) in contact with the cooling ring (6), and a cooling strip (7) is provided on the cooling ring (6), and the cooling channel (3) passes through the cooling strip (7).

3. The cooling device for an electric motor according to claim 2, characterized in that, The cooling strip (7) and the cooling body (2) have radially arranged cooling fins (8).

4. A cooling device for an electric motor according to claim 2, characterized in that, The parallel flow device includes an upper U-shaped connecting elbow (9) and a lower U-shaped connecting elbow (10). The upper U-shaped connecting elbow (9) is connected to the upper end of the cooling bar (7), causing the cooling channels (3) on the cooling bar (7) to form an upper connection in pairs. The lower U-shaped connecting elbow (10) is connected to the lower end of the cooling bar (7), causing the cooling channels (3) on the cooling bar (7) to form a lower connection in pairs. The upper U-shaped connecting elbow (9) and the lower U-shaped connecting elbow (10) are circumferentially misaligned, causing adjacent cooling channels (3) to be connected in series to form the cooling flow channel.

5. A cooling device for an electric motor according to claim 4, characterized in that, Both the upper U-shaped connecting elbow (9) and the lower U-shaped connecting elbow (10) are provided with a plug-in part (11) for connecting with the cooling channel (3) on the cooling strip (7). Each plug-in part (11) is provided with one or more sealing rings by being embedded therein. When the upper U-shaped connecting elbow (9) and the lower U-shaped connecting elbow (10) are plugged into the cooling channel (3) on the cooling strip (7), the sealing rings seal against the inner wall of the corresponding cooling channel (3) and form a sealed connection.

6. A cooling device for an electric motor according to claim 1, characterized in that, The cooling device also includes an upper end plate (12) and a lower end plate (13). The upper end plate (12) is located above the cooling body (2), and the lower end plate (13) is located below the cooling body (2). The upper end plate (12), the cooling body (2), and the lower end plate (13) are axially fixedly connected by bolts (14).

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