Liquid-gas separation device of liquid-cooled motor

Abstract

The invention relates to a liquid-gas separation device of a liquid-cooled motor. The liquid-gas separation device comprises an end cover provided with a center hole, and a liquid injection hole and a ventilation valve mounting hole which are arranged around the center hole, a liquid-gas separation ring groove is formed around the center hole, the liquid-gas separation ring groove is a variable-diameter spiral ring groove with the center hole as the center from inside to outside, a liquid blocking cover plate is arranged, the liquid blocking cover plate covers the liquid-gas separation ring groove to form a liquid-gas separation channel, and the liquid-gas separation channel is provided with an air exchange port. By arranging the spiral reducing liquid-gas separation ring groove, the effect of fully separating a gaseous cooling liquid and air mixture generated at high temperature during operation of a motor is achieved, and the problem that in the prior art, the cooling liquid damages the air permeability of the ventilation valve is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of in-wheel motors, and particularly to a liquid-gas separation device for a liquid-cooled motor. Background Art

[0002] During the operation of the motor, heat is generated. To quickly dissipate the heat of the motor core and keep the motor operating efficiently within a suitable temperature range, an insulating liquid is injected into the motor to achieve the purpose of quickly dissipating the heat of the motor. Inside the motor with an oil-cooling method, due to the action of high temperature and a high-speed rotating rotor, part of the coolant inside the motor housing will be atomized, forming a gaseous liquid-gas mixture, which will cause the pressure inside the motor housing to be too high, posing a great challenge to the motor seal. At this time, a motor with poor sealing will experience oil leakage, so it is necessary to relieve the pressure inside the oil-cooled motor housing.

[0003] A 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 by the current liquid-cooled motor.

[0004] Chinese invention application CN117639352A discloses a liquid-cooled motor liquid-blocking labyrinth structure, including a mounting plate, a central hole is provided on the mounting plate, and further includes 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 permeation channel is provided inside the labyrinth liquid-blocking member, and a first air permeation port and a second air permeation port communicating with the air permeation channel are provided on the labyrinth liquid-blocking member. A main liquid-blocking plate is arranged at each air permeation port; further, an air valve mounting hole for mounting an air valve is provided on the labyrinth liquid-blocking member and / or the mounting plate, and the gas entering the air permeation channel from the air permeation port can be discharged through the air valve mounted on the air valve mounting hole.

[0005] In the above labyrinth structure, the main liquid-blocking plate tries to block the coolant outside the air permeation port; however, there is still coolant that will enter the air permeation channel through the air permeation port. Since the labyrinth liquid-blocking member is of an annular structure and is distributed around the central hole, the centrifugal force generated by the rotation of the rotor will throw out this part of the coolant from the air permeation port, minimizing the possibility of the coolant contacting the air valve, and the air valve can maintain stable operation for a long time, always ensuring the air pressure balance inside and outside the motor.

[0006] The above technical solution can theoretically avoid the contact between the coolant and the breather valve. However, the main factor affecting the air exchange of the liquid-cooled motor is the liquid-gas mixture generated by the high temperature of the motor. Since the maze structure has only one circle of ventilation channels, the path given to the liquid-gas mixture to run is too short. The liquid coolant may be centrifugally thrown out, but there will still be a certain amount of liquid-gas mixture that has not condensed into a gaseous state reaching the breather valve. When the liquid-gas mixture condenses, the coolant in it will still adhere to the breather membrane, damaging the permeability of the breather membrane, thus affecting the balance of the air pressure inside and outside the motor. Moreover, the entire maze liquid-blocking part has a complex structure and a high mold manufacturing cost. Summary of the Invention

[0007] The purpose of the present invention is to provide a liquid-gas separation device for a liquid-cooled motor. By setting a spiral variable-diameter liquid-gas separation ring groove, the effect of fully separating the gaseous coolant and air mixture generated by the high temperature during the operation of the motor is achieved, and the problem that the coolant in the prior art damages the air permeability of the breather valve is solved.

[0008] To achieve the above purpose, the technical solution of the present invention is as follows: A liquid-gas separation device for a liquid-cooled motor includes an end cover provided with a central hole, and a liquid injection hole and a breather valve installation hole are arranged around the central hole; A liquid-gas separation ring groove is arranged around the central hole. The liquid-gas separation ring groove is a variable-diameter spiral ring groove centered on the central hole and extending from the inside to the outside. A liquid-blocking cover plate is provided, and the liquid-blocking cover plate covers the liquid-gas separation ring groove to form a liquid-gas separation channel. The liquid-gas separation channel is provided with an air exchange port.

[0009] The spiral winding direction of the liquid-gas separation ring groove is opposite to the rotation direction of the motor.

[0010] Centered on the central hole, the width of the liquid-gas separation ring groove gradually becomes wider from the inside to the outside.

[0011] The air exchange port is the opening at the starting point and the ending point of the liquid-gas separation ring groove. The opening of the liquid-gas separation ring groove at the starting point centered on the central hole is the inner air exchange port, and the ending opening of the liquid-gas separation ring groove is the outer air exchange port.

[0012] The opening direction of the outer air exchange port is opposite to the rotation direction of the motor.

[0013] A filtering device is arranged around the central hole.

[0014] The filtering device is arranged in the space between the central hole and the liquid-gas separation ring groove.

[0015] The central hole has an outer wall of the central hole, and protrusions are provided on the outer wall of the central hole. The filtering device is in a ring shape, and a groove corresponding to the protrusion is provided on the inner wall of the ring shape.

[0016] The liquid injection hole and the breather valve installation hole are arranged in the protrusions on the outer wall of the central hole.

[0017] The filtering device is a filter screen made of stainless steel mesh, fiberglass or polyurethane.

[0018] The advantages of the present invention are as follows: 1. The spiral rotation direction of the liquid-gas separation ring groove around the central hole is opposite to the rotation direction of the motor, and the centrifugal force can be used to throw out the coolant entering the liquid-gas separation ring groove; 2. The spiral variable-diameter liquid-gas separation ring groove arranged around the central hole can extend the running path of the liquid-gas mixture in which the atomized coolant generated by the high temperature of the motor is mixed with air in a gaseous state, so that the atomized coolant in the liquid-gas mixture has sufficient condensation time to achieve the effect of complete liquid-gas separation; 3. A filtering device is arranged in the space between the inner ring of the liquid-gas separation ring groove and the central hole, which can retain the coolant condensed during the running of the liquid-gas mixture and then throw it out of the liquid-gas separation ring groove by centrifugal force, further improving the liquid-gas separation effect and ensuring that the coolant will not enter the position where the air permeable valve is located; 4. For the spiral variable-diameter liquid-gas separation ring groove, its width also gradually becomes wider from the inside to the outside, making it more convenient for the coolant to be thrown out of the liquid-gas separation ring groove under the action of centrifugal force. Description of the Drawings

[0019] Figure 1 is an exploded view of the structure of the present invention.

[0020] Figure 2 is a cross-sectional view of the structure of the present invention.

[0021] Figure 3 is a schematic diagram of the structure of the end cover of the present invention.

[0022] In the figure: 1 - central hole; 11 - outer wall of the central hole; 2 - liquid injection hole; 3 - air permeable valve installation hole; 4 - liquid-gas separation ring groove; 41 - groove wall; 51 - outer air exchange port; 52 - inner air exchange port; 6 - liquid blocking cover plate; 7 - end cover; 8 - filtering device. Detailed Embodiment

[0023] The following further describes the present invention with reference to the drawings. The drawings are only for illustrative purposes and should not be construed as a limitation of this patent.

[0024] For the sake of more concise description of this embodiment, 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. In addition, for the convenience of expression, some components in the drawings will be omitted, enlarged or reduced, but this does not represent the size or all structures of the actual product.

[0025] A liquid-gas separation device for a liquid-cooled motor of the present invention, as Figures 1-3 shown, it includes an end cover 7 provided with a central hole 1, a liquid injection hole 2 is arranged around the central hole 1 for injecting coolant, and an air permeable valve installation hole 3 for installing an air permeable valve.

[0026] AsFigure 3 As shown in the figure, a liquid-gas separation ring groove 4 is provided around the central hole 1. The liquid-gas separation ring groove 4 is designed according to the principle of the Archimedes curve and is a variable-diameter spiral ring groove from the inside to the outside with the central hole 1 as the center, which can achieve the best centrifugal effect.

[0027] As Figure 1 shown in the figure, a liquid-blocking cover plate 6 is provided. The liquid-blocking cover plate 6 covers the liquid-gas separation ring groove 4 to form a liquid-gas separation channel, which is a place for separating the gaseous liquid-gas mixture generated by the high temperature during the operation of the motor. Among them, the covering method of the liquid-blocking cover plate 6 and the liquid-gas separation ring groove 4 that constitute the liquid-gas separation channel can be fixed together by bolts, riveting or even welding, etc., or they can be integrally formed.

[0028] In order to achieve a better liquid-gas separation effect, it is necessary to make the path of the liquid-gas separation channel formed by covering the liquid-blocking cover plate 6 on the liquid-gas separation ring groove 4 as long as possible. In order to extend the path of the liquid-gas mixture as much as possible in the narrow motor space to extend the path of the liquid-gas mixture, so that the gas reaching the breather valve finally contains little or no coolant, and the purpose of extending the service life of the breather valve can be achieved. The number of spiral turns can be designed as much as possible according to the actual size of the end cover 7 to extend the path of the liquid-gas mixture as much as possible.

[0029] An air exchange port is provided in the liquid-gas separation channel. The air exchange port is the opening at the starting point and the ending point of the liquid-gas separation ring groove 4. The opening of the liquid-gas separation ring groove 4 at the starting point with the central hole 1 as the center is the inner air exchange port 52, and the ending opening of the liquid-gas separation ring groove 4 is the outer air exchange port 51.

[0030] The spiral winding direction of the liquid-gas separation ring groove 4 is opposite to the rotation direction of the motor. The opening direction of the outer air exchange port 51 is opposite to the rotation direction of the motor.

[0031] Moreover, the liquid-gas separation ring groove 4 is centered on the central hole 1, and the width of the liquid-gas separation ring groove 4 gradually becomes wider from the inside to the outside. This not only extends the running path of the liquid-gas mixture, but also can more effectively throw the liquefied coolant in the liquid-gas separation ring groove 4 out of the outer air exchange port 51 immediately.

[0032] As Figure 2 、 Figure 3 shown in the figure, a filtering device 8 is provided around the central hole 1. The filtering device 8 is arranged in the space between the central hole 1 and the liquid-gas separation ring groove 4.

[0033] Preferably, as Figure 1 shown in the figure, the central hole 1 has a central hole outer wall 11, and there are protrusions on the central hole outer wall 11. The filtering device 8 is annular, and there are grooves corresponding to the protrusions on the inner wall of the annulus. The liquid injection hole 2 and the breather valve mounting hole 3 are arranged in the protrusions of the central hole outer wall 11.

[0034] The filtering device 8 is arranged according to the central hole 1, which can not only be better fixed, but also ensure that the filtering device 8 will not rotate during the operation of the motor after installation.

[0035] Generally, the filtering device 8 can be a filter screen made of stainless steel mesh, fiberglass or polyurethane.

[0036] When the liquid-cooled motor rotates at high speed, a large amount of gaseous atomized coolant will be generated, forming a liquid-gas mixture. When the pressure in the inner cavity of the motor increases, the liquid-gas mixture will enter the vicinity of the central hole 1 along the liquid-gas separation ring groove 4, thus affecting the function of the breather valve. The filter screen installed in the space between the central hole 1 and the liquid-gas separation ring groove 4 will intercept the atomized coolant in the high-temperature liquid-gas mixture, and the liquefied liquid droplets will be thrown out of the liquid-gas separation ring groove 4 under the action of centrifugal force, so as to ensure that the gas passing through the breather valve does not contain coolant.

[0037] 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 be within the technical scope of the present invention.

Claims

1. A liquid-gas separation device for a liquid-cooled motor, comprising an end cover (7) provided with a central hole (1), and a liquid injection hole (2) and a breathable valve mounting hole (3) provided around the central hole (1); Features: A liquid-gas separation annular groove (4) is arranged around the central hole (1). The liquid-gas separation annular groove (4) is a spiral annular groove with a variable diameter from the inside to the outside with the central hole (1) as the center. A liquid blocking cover plate (6) is arranged. The liquid blocking cover plate (6) covers the liquid-gas separation annular groove (4) to form a liquid-gas separation channel. The liquid-gas separation channel is provided with an air exchange port.

2. The liquid-gas separation device for a liquid-cooled motor according to claim 1, characterized in that: The spiral rotation direction of the liquid-gas separation annular groove (4) is opposite to the rotation direction of the motor.

3. The liquid-gas separation device for a liquid-cooled motor according to claim 2, characterized in that: With the central hole (1) as the center, the width of the liquid-gas separation annular groove (4) gradually widens from the inside to the outside.

4. The liquid-gas separation device for a liquid-cooled motor according to claim 3, characterized in that: The air exchange port is the opening at the starting point and the end point of the liquid-gas separation annular groove (4). The opening of the liquid-gas separation annular groove (4) starting from the center hole (1) is the inner air exchange port (52), and the opening at the end point of the liquid-gas separation annular groove (4) is the outer air exchange port (51).

5. The liquid-gas separation device for a liquid-cooled motor according to claim 4, characterized in that: The opening direction of the external air exchange port (51) is opposite to the rotation direction of the motor.

6. The liquid-gas separation device for a liquid-cooled motor according to claim 1, characterized in that: A filtering device (8) is arranged around the central hole (1).

7. The liquid-gas separation device for a liquid-cooled motor according to claim 6, characterized in that: The filtering device (8) is arranged in the space between the central hole (1) and the liquid-gas separation annular groove (4).

8. The liquid-gas separation device for a liquid-cooled motor according to claim 6, characterized in that: The central hole (1) has a central hole outer wall (11), a protrusion is provided on the central hole outer wall (11), and the filtering device (8) is annular, and a groove corresponding to the protrusion is provided on the inner wall of the annular shape.

9. The liquid-gas separation device for a liquid-cooled motor according to claim 8, characterized in that: The liquid injection hole (2) and the air-permeable valve installation hole (3) are arranged in the protrusion of the outer wall (11) of the central hole.

10. The liquid-gas separation device for a liquid-cooled motor according to claim 6, characterized in that: The filter device (8) is a filter made of stainless steel mesh or glass fiber or polyurethane.

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