Hub motor with liquid-gas separation function

Abstract

The invention relates to a hub motor with a liquid-gas separation function. The hub motor comprises a liquid-gas separation device arranged outside the hub motor. The liquid-gas separation device comprises a gas inlet and a gas outlet, and the gas outlet is located above the gas inlet; an opening in one end of the ventilation pipe is formed in a motor cavity formed by the machine shell and the end cover, and the other end of the ventilation pipe is connected with an air inlet of the liquid-air separation device. The device is simple in structure and convenient to install and overhaul, and internal and external pressure balance can be more efficiently achieved in the motor operation process.

Description

Technical Field

[0001] The present invention relates to the technical field of in-wheel motors, and specifically to an in-wheel motor with a liquid-gas separation function. Background Art

[0002] In the existing outer-rotor in-wheel motor, the stator is installed on the stator bracket. The stator bracket is designed with a relatively small inner hole to be fixed on the motor shaft, and the left and right end covers are connected to the rim to form a rotor assembly which is installed on the motor shaft. During the operation of the electric vehicle in-wheel motor, the current passing through the coils on the stator will generate heat, and the heat generated by the coils on the stator is transferred out through two paths at the same time; one is to transfer from the stator to the stator bracket, and then the stator bracket transfers it to the motor shaft, and the motor shaft dissipates the heat into the air of the motor housing; the other is to use the air in the motor cavity as a heat conduction medium, and the air in the cavity then transfers the heat to the left and right end covers, and the left and right end covers absorb the heat in the cavity and dissipate it into the external air. This heat dissipation method has poor overall heat dissipation effect of the motor due to the low thermal conductivity of air and the small contact area between the stator bracket and the motor shaft. The high temperature of the motor coils will also increase the coil resistance, reduce the motor efficiency, and shorten the cruising range of the whole vehicle. In order to dissipate heat quickly, the prior art injects insulating cooling liquid into the motor to achieve the purpose of quickly dissipating heat from the motor; however, inside the motor with liquid cooling method, due to the action of high temperature and high-speed rotating rotor, part of the coolant inside the motor housing will be atomized, resulting in too high pressure inside the motor housing, which poses a great challenge to the motor seal. At this time, the motor with poor sealing will leak oil outward, so it is necessary to relieve the pressure inside the oil-cooled motor housing.

[0003] The commonly used method in the prior art is to install a breather valve on the motor housing and use the breather membrane on the breather valve for gas exchange inside and outside the motor. However, the high temperature during the operation of the motor atomizes the coolant, and the formed gaseous liquid-gas mixture will also diffuse to the breather valve. When the atomized coolant in the liquid-gas mixture cools into liquid droplets, it will adhere to the breather membrane, ultimately causing the breather membrane to lose its gas permeation function. Therefore, how to prevent the liquid-gas mixture from diffusing to the breather valve is a problem to be solved for the current liquid-cooled motor.

[0004] Chinese invention application CN117639352A discloses a liquid-cooled motor liquid-blocking labyrinth structure, including a mounting plate provided with a central hole thereon, and further including a labyrinth liquid-blocking member mounted on the mounting plate. The labyrinth liquid-blocking member is of an annular structure and is distributed around the central hole. An air-permeable channel is provided inside the labyrinth liquid-blocking member, and a first air-permeable port and a second air-permeable port communicating with the air-permeable channel are provided on the labyrinth liquid-blocking member. A main liquid-blocking plate is arranged at each air-permeable port; further, an air-permeable valve mounting hole for mounting an air-permeable valve is provided on the labyrinth liquid-blocking member and / or the mounting plate, and the gas entering the air-permeable channel from the air-permeable port can be discharged through the air-permeable valve mounted on the air-permeable valve mounting hole, always ensuring the air pressure balance inside and outside the motor.

[0005] Although the above technical solution can achieve the air pressure balance inside and outside the motor, the labyrinth structure of the cover is too complex, the air-permeable membrane cannot ensure long-term damage-free, and it is not convenient to replace. The effectiveness of the internal and external pressure balance during the operation of the motor is not high, and the mold for manufacturing the entire motor also needs to be correspondingly changed, increasing the production cost. Summary of the Invention

[0006] The object of the present invention is to provide a hub motor with a liquid-gas separation function, which solves the problems of complex structure of the existing motor, low effectiveness of achieving the internal and external pressure balance during the operation of the motor, and inconvenient maintenance and installation.

[0007] To achieve the above object, the technical solution of the present invention is: A hub motor with a liquid-gas separation function includes a motor housing, a rotor, a stator, a stator bracket, a motor shaft, and two end covers respectively covering the left and right ports of the motor housing. The stator is arranged on the stator bracket, and the stator bracket is fixedly sleeved on the motor shaft; the rotor is arranged inside the motor housing and sleeved outside the stator; the motor housing and the end covers form a motor cavity, and a cooling insulating liquid is further arranged inside the motor cavity; It further includes a liquid-gas separation device arranged outside the hub motor. The liquid-gas separation device includes an air inlet and an air outlet, and the air outlet is located above the air inlet; a ventilation pipe is provided, one end of the ventilation pipe opens into the motor cavity, and the other end of the ventilation pipe is connected to the air inlet of the liquid-gas separation device.

[0008] The motor shaft is provided with a wire outlet hole, and one end of the ventilation pipe enters the motor cavity from the wire outlet hole.

[0009] The stator bracket includes a stator mounting portion, a connecting portion, and a shaft hole for arranging the motor shaft. The connecting portion is provided with a through hole, and one end of the ventilation pipe enters the motor cavity from the through hole.

[0010] A liquid-gas separation channel is arranged between the air inlet and the air outlet of the liquid-gas separation device.

[0011] The liquid-gas separation device is box-shaped; the air inlet is arranged at the bottom of the liquid-gas separation device, and the air outlet is arranged at the top of the liquid-gas separation device. The liquid-gas separation channel is composed of at least two partition plates arranged in the inner cavity of the liquid-gas separation device; the partition plates are arranged opposite to each other. The right end of the first partition plate is connected to the right inner wall of the liquid-gas separation device, and a liquid-gas channel is arranged between the left end of the first partition plate and the left inner wall; the left end of the second partition plate is connected to the left inner wall of the liquid-gas separation device, and a liquid-gas channel is arranged between the right end of the second partition plate and the right inner wall; and so on. The partition plates are alternately arranged in the inner cavity of the liquid-gas separation device, and each partition plate and its liquid-gas channel form the liquid-gas separation channel.

[0012] The partition plate is arranged to incline towards the liquid-gas channel and towards the bottom.

[0013] There is a height difference on both sides of the bottom of the liquid-gas separation device, and its bottom inclines towards the air inlet side.

[0014] The liquid-gas separation device is in the shape of a cubic box; the width of the partition plate is the same as the width of the inner cavity of the liquid-gas separation device. A breather valve is arranged at the air outlet.

[0015] A filtering device is arranged at the air outlet.

[0016] The advantages of the present invention are as follows: 1. It can achieve efficient and rapid balance of internal and external air pressures without changing the structure of the original hub motor; 2. The externally arranged liquid-gas separation device is convenient to install and replace, and is also very convenient for maintenance; 3. The liquid-gas separation channel formed by the inner side wall of the liquid-gas separation device and the liquid-gas channels of the partition plates guides the liquid-gas mixture discharged from the motor entering from the air inlet to rise in a zigzag manner, so that the liquid-gas mixture can be fully cooled and separated during the zigzag rising process; 4. The partition plate is arranged to incline towards the bottom, so that the coolant separated from the liquid-gas mixture during the rising process can flow along the partition plate to the bottom and flow back into the motor through the ventilation pipe after the motor stops running and cools down. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention.

[0018] Figure 2 It is a schematic structural diagram of Embodiment 2 of the present invention.

[0019] Figure 3 It is a schematic structural diagram of the liquid-gas separation device of the present invention.

[0020] In the figure: 1 - housing; 2 - rotor; 3 - stator; 4 - stator bracket; 5 - motor shaft; 51 - wire outlet hole; 6 - end cover; 7 - liquid-gas separation device; 71 - air inlet; 72 - air outlet; 73 - first partition plate; 74 - second partition plate; 75 - liquid-gas channel; 76 - breather valve; 77 - filtering device; 8 - ventilation pipe; 9 - stator phase wire; 10 - motor cavity. Detailed implementation manners

[0021] The present invention will be further described below with reference to the accompanying drawings. The accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent.

[0022] To describe this embodiment more concisely, some components that are well-known to those skilled in the art but not relevant to the main content of this creation will be omitted in the drawings or description. Additionally, for the convenience of expression, some components in the drawings will be omitted, enlarged, or reduced, but this does not represent the actual size or entire structure of the product.

[0023] A hub motor with a liquid-gas separation function according to the present invention, such as Figure 1 , Figure 2 shown in two hub motors with a liquid-gas separation function, includes a housing 1, a rotor 2, a stator 3, a stator bracket 4, a motor shaft 5, and two end covers 6 respectively covering the left and right ports of the housing 1. The stator 3 is disposed on the stator bracket 4, and the stator bracket 4 is fixedly sleeved on the motor shaft 5; the rotor 2 is disposed inside the housing 1 and sleeved outside the stator 3; the housing 1 and the end cover 6 of the outer-rotor hub motor of the present invention form a motor cavity 10, and a cooling insulating liquid is further disposed inside the motor cavity 10.

[0024] A liquid-gas separation device 7 is disposed outside the hub motor. The liquid-gas separation device 7 includes an air inlet 71 and an air outlet 72, and the air outlet 72 is located above the air inlet 71.

[0025] A ventilation pipe 8 is provided to connect the hub motor and the liquid-gas separation device 7. One end of the ventilation pipe 8 opens inside the motor cavity 10, and the other end of the ventilation pipe 8 is connected to the air inlet 71 of the liquid-gas separation device 7.

[0026] According to different types of hub motors, the way the ventilation pipe 8 opens inside the motor cavity 10 is different.

[0027] Embodiment 1, as Figure 1 shown, is a commonly used hub motor nowadays. Its motor shaft 5 is provided with a wire outlet hole 51 for the stator phase wire 9 to lead out of the motor from the wire outlet hole 51. In Embodiment 1, that is, by using this wire outlet hole 51, the ventilation pipe 8 is introduced into the motor cavity 10 from the wire outlet hole 51 and opens inside the motor cavity 10.

[0028] Embodiment 2, as Figure 2As shown, this is a hub motor designed by the patentee. Its stator bracket 4 is wide, which is different from the stator bracket 4 in the first embodiment. The stator bracket 4 includes a stator mounting portion 41, a connecting portion 42, and a shaft hole for the motor shaft 5. The stator 3 is mounted at the stator mounting portion 41. The connecting portion 41 can be provided with terminals for the stator phase wires 9. The motor shaft 5 no longer has an outlet hole 51, and the strength of the motor shaft 5 is greatly enhanced. In this embodiment, through holes can be provided in the connecting portion 42, and one end of the ventilation pipe 8 enters the motor cavity 10 through the through hole and opens inside the motor cavity 10.

[0029] The function of the liquid-gas separation device 7 is to smoothly discharge the high-temperature gas inside the hub motor, so as to balance the pressure inside the hub motor with the outside world. Therefore, as Figure 3 shown, a liquid-gas separation channel is provided between the air inlet 71 and the air outlet 72 of the liquid-gas separation device 7.

[0030] Preferably, the liquid-gas separation device 7 is designed in a box shape; the air inlet 71 is provided at the bottom of the liquid-gas separation device 7, and the air outlet 72 is provided at the top of the liquid-gas separation device 7; The liquid-gas separation channel is composed of at least two partition plates provided in the inner cavity of the liquid-gas separation device 7; multiple partition plates can be provided, and the partition plates are arranged oppositely.

[0031] As Figure 3 shown, the right end of the first partition plate 73 is connected to the right inner wall of the liquid-gas separation device 7, and a liquid-gas channel 75 is provided between the left end of the first partition plate 73 and the left inner wall; the left end of the second partition plate 74 is connected to the left inner wall of the liquid-gas separation device 7, and a liquid-gas channel 75 is provided between the right end of the second partition plate 74 and the right inner wall; and so on. The partition plates are alternately arranged in the inner cavity of the liquid-gas separation device 7, and each partition plate and its liquid-gas channel 75 constitute the liquid-gas separation channel. By providing partition plates in the inner cavity of the liquid-gas separation device 7, the running distance of the liquid-gas mixture is artificially increased, so that the liquid-gas mixture can be fully cooled and separated.

[0032] Furthermore, the partition plates are arranged to incline towards the liquid-gas channel 75 and towards the bottom. In this way, the cooled coolant in the liquid-gas mixture can flow along the partition plates towards the bottom, and finally flow to the air inlet 71 and return to the motor cavity 10 through the ventilation pipe 8.

[0033] There is a height difference on both sides of the bottom of the liquid-gas separation device 7, and its bottom inclines towards the air inlet 71, which is more convenient for the return of the coolant.

[0034] The multi-piece downwardly inclined separator plates with an interleaved design form narrow channels for the liquid-gas mixture between adjacent separator plates. High-pressure and low-pressure regions are formed at both ends of the narrow channels for the liquid-gas mixture. When the high-temperature liquid-gas mixture flows from the high-pressure region to the low-pressure region, the liquid-gas mixture will be compressed and condensed, and the small-molecule coolant mist will condense into large-molecule coolant droplets. If the separator plates are made of metal, when contacting the metal separator plates, they will agglomerate into coolant and flow down along the separator plates to the air inlet 71. The liquid-gas separation device 7 is formed by multiple separator plates to form an S-shaped running path for the liquid-gas mixture, so that the content of the coolant in the liquid-gas mixture becomes less and less when it is discharged upward.

[0035] Furthermore, the liquid-gas separation device 7 is designed in a cubic box shape, and the width of the separator plate is the same as the inner cavity width of the liquid-gas separation device 7, so as to ensure that the liquid-gas mixture can only run along the directions of the air inlet 71, the liquid-gas channel 75, and the air outlet 72.

[0036] A breathable valve 76 is provided at the air outlet 72, and a breathable membrane can be installed at the breathable valve 76 to ensure that only air in the external environment can enter the liquid-gas separation device 7.

[0037] A filtering device 77 is provided at the air outlet 72. The uncondensed coolant molecules in the separator plates will be blocked in the filtering device 77 to ensure that the air discharged to the breathable valve 76 is pure air, avoid the coolant mist adsorbing on the surface of the breathable valve 76 and reducing the exhaust effect, and further ensure that only the gas part in the liquid-gas mixture can reach the air outlet 72.

[0038] The above is only the preferred embodiment of the present invention and is not used to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the content of the patent application scope of the present invention should fall within the technical scope of the present invention.

Claims

1. A hub motor with a liquid-gas separation function, comprising a housing (1), a rotor (2), a stator (3), a stator bracket (4), a motor shaft (5), and two end covers (6) respectively covering left and right ports of the housing (1), wherein the stator (3) is arranged on the stator bracket (4), and the stator bracket (4) is fixedly sleeved on the motor shaft (5); the rotor (2) is arranged in the housing (1) and outside the stator (3); the housing (1) and the end covers (6) form a motor cavity (10), and a cooling insulating liquid is also arranged in the motor cavity (10); Features: It also includes a liquid-gas separation device (7) arranged outside the wheel hub motor, the liquid-gas separation device (7) including an air inlet (71) and an air outlet (72), and the air outlet (72) is located above the air inlet (71); A ventilation pipe (8) is provided, one end of the ventilation pipe (8) opens into the motor cavity (10), and the other end of the ventilation pipe (8) is connected to the air inlet (71) of the liquid-gas separation device (7).

2. The hub motor with liquid-gas separation function according to claim 1, characterized in that: The motor shaft (5) is provided with a wire outlet hole (51), and one end of the vent pipe (8) enters the motor cavity (10) through the wire outlet hole (51).

3. The hub motor with liquid-gas separation function according to claim 1, characterized in that: The stator bracket (4) comprises a stator mounting portion (41), a connecting portion (42) and an axial hole for arranging a motor shaft (5); the connecting portion (41) is provided with a through hole, and one end of the vent pipe (8) enters the motor cavity (10) through the through hole.

4. The hub motor with liquid-gas separation function according to claim 1, characterized in that: A liquid-gas separation channel is provided between the gas inlet (71) and the gas outlet (72) of the liquid-gas separation device (7).

5. The hub motor with liquid-gas separation function according to claim 4, characterized in that: The liquid-gas separation device (7) is box-shaped; the air inlet (71) is arranged at the bottom of the liquid-gas separation device (7), and the air outlet (72) is arranged at the top of the liquid-gas separation device (7); The liquid-gas separation channel is composed of at least two isolation plates arranged in the inner cavity of the liquid-gas separation device (7); the isolation plates are arranged opposite to each other; The right end of the first isolation plate (73) is connected to the right inner wall of the liquid-gas separation device (7), and a liquid-gas passage (75) is provided between the left end of the first isolation plate (73) and the left inner wall; the left end of the second isolation plate (74) is connected to the left inner wall of the liquid-gas separation device (7), and a liquid-gas passage (75) is provided between the right end of the second isolation plate (74) and the right inner wall; and so on, the isolation plates are alternately provided in the inner cavity of the liquid-gas separation device (7), and each isolation plate and its liquid-gas passage constitutes a liquid-gas separation passage.

6. The hub motor with liquid-gas separation function according to claim 5, characterized in that: The isolation plate is arranged to be inclined toward the liquid-gas channel (75) and toward the bottom.

7. The hub motor with liquid-gas separation function according to claim 5, characterized in that: A height difference is provided on both sides of the bottom of the liquid-gas separation device (7), and the bottom thereof is inclined toward the air inlet (71).

8. The hub motor with liquid-gas separation function according to claim 5, characterized in that: The liquid-gas separation device (7) is in the shape of a cubic box, and the width of the isolation plate is the same as the width of the inner cavity of the liquid-gas separation device (7).

9. The hub motor with liquid-gas separation function according to claim 4, characterized in that: A vent valve (76) is provided at the air outlet (72).

10. The hub motor with liquid-gas separation function according to any one of claims 4 to 9, characterized in that: A filter device (77) is provided at the air outlet (72).

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