End cover of liquid-cooled motor

Abstract

The invention relates to an end cover of a liquid cooling motor, which is provided with a central hole, and a liquid injection hole and a ventilation valve mounting hole are arranged around the central hole. A liquid-gas separation ring groove is formed around the center hole and is provided with an air exchange port; a liquid blocking cover plate covering the liquid-gas separation ring groove is further arranged, and the liquid blocking cover plate covers the liquid-gas separation ring groove to form a liquid-gas separation channel. A circle of liquid-gas separation annular groove is formed around the center hole, and a liquid blocking plate is arranged at the air exchange opening. Through the arrangement of the liquid-gas separation ring grooves and the multiple circles of liquid-gas separation ring grooves, the effect of fully separating a gaseous cooling liquid and air mixture generated at high temperature during operation of the 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 specifically to an end cover of a liquid-cooled motor. Background Art

[0002] During the operation of the motor, heat is generated. In order 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 oil-cooled motor, due to the action of high temperature and the high-speed rotating rotor, part of the coolant inside the motor housing will be atomized to form 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 leak oil outward. Therefore, 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 between the inside and outside of 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-permeable channel is provided inside the labyrinth liquid-blocking member. 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, and a main liquid-blocking plate is provided at each air-permeable port; further, an air-permeable valve mounting hole for mounting a breather 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 breather valve mounted on the air-permeable valve mounting hole.

[0005] In the above labyrinth structure, the main liquid-blocking plate tries to block the coolant outside the air-permeable port; however, there is still coolant that will enter the air-permeable channel through the air-permeable 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 this part of the coolant out of the air-permeable port, minimizing the possibility of the coolant contacting the breather valve, and the breather 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 there is only one circle of air-permeable channels in the above maze structure, the path for 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 gas reaching the breather valve. When the liquid-gas mixture condenses, the coolant in it will still adhere to the breathable membrane, damaging the permeability of the breathable membrane, thus affecting the balance of the air pressure inside and outside the motor, and the entire maze liquid-blocking part has a complex structure and high mold manufacturing cost. Summary of the Invention

[0007] The object of the present invention is to provide an end cover for a liquid-cooled motor. By setting a liquid-gas separation ring groove and multiple circles of liquid-gas separation ring grooves, 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 object, the technical solution of the present invention is as follows: An end cover for a liquid-cooled motor is 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, and the liquid-gas separation ring groove is provided with an air exchange port; a liquid-blocking cover plate covering the liquid-gas separation ring groove is also provided, and the liquid-blocking cover plate covers the liquid-gas separation ring groove to form a liquid-gas separation channel.

[0009] A circle of liquid-gas separation ring groove is arranged around the central hole, and a liquid-blocking plate is arranged at the air exchange port.

[0010] At least two circles of multiple liquid-gas separation ring grooves are arranged from the outside to the inside around the central hole. Each circle of liquid-gas separation ring groove is provided with an air exchange port, and the air exchange ports of multiple liquid-gas separation ring grooves are arranged in a staggered manner.

[0011] The liquid-gas separation ring groove is set as an elliptical ring groove, and the air exchange port is arranged at the intersection of the long axis of the ellipse and the ellipse.

[0012] The long axes of the ellipses of adjacent two circles of liquid-gas separation ring grooves do not coincide. Two air exchange ports are arranged at the two intersections of the ellipse and the long axis of each circle of liquid-gas separation ring groove, and two first air exchange ports are arranged on the outermost circle of liquid-gas separation ring groove.

[0013] The liquid-blocking plate is arranged at the first air exchange port.

[0014] The liquid-gas separation ring groove arranged around the central hole is such that the height of the groove wall forming the liquid-gas separation ring groove decreases sequentially from the outside to the inside.

[0015] The liquid-blocking cover plate is provided with recessed steps corresponding to the wall heights of the respective liquid-gas separation annular grooves from outside to inside. Each recessed step and the corresponding liquid-gas separation annular groove cover to form a liquid-gas separation channel, and the diameters of the respective air exchange ports gradually decrease from outside to inside.

[0016] Centrifugal blades are provided on the outer surface of the liquid-blocking cover plate.

[0017] A filtering device is provided in the liquid-gas separation annular groove.

[0018] The advantages of the present invention are as follows: 1. The liquid-gas separation annular grooves surrounding the central hole can use centrifugal force to throw out the coolant entering the liquid-gas separation annular grooves; 2. Multiple circles of liquid-gas separation annular grooves are provided around the central hole, which 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, enabling the atomized coolant in the liquid-gas mixture to have sufficient condensation time to achieve the effect of full liquid-gas separation; 3. The liquid-blocking plate can block the coolant above the air exchange port from dripping into the liquid-gas separation annular groove; 4. The liquid-gas separation annular groove is set as an ellipse, and the air exchange port is arranged on the long axis of the ellipse, which can achieve the best centrifugal effect; 5. A filtering device is provided in the liquid-gas separation annular groove, which can retain the condensed coolant during the running of the liquid-gas mixture and then throw it out of the liquid-gas separation annular 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; 6. The multiple circles of liquid-gas separation annular grooves gradually decrease in height from outside to inside, and the liquid-blocking cover plate is provided with corresponding recessed steps to ensure that the gaseous liquid-gas mixture diffuses along the designed route towards the air permeable valve to achieve the best liquid-gas separation effect; 7. The air exchange ports of the respective liquid-gas separation annular grooves gradually decrease in diameter from outside to inside, reducing the possibility of the coolant entering the innermost liquid-gas separation annular groove and further enhancing the liquid-gas separation effect; 8. The centrifugal blades on the outer surface of the liquid-blocking cover plate reduce the amount of coolant entering the liquid-gas separation annular groove. Description of the Drawings

[0019] Figure 1 is an exploded view of the structure of the present invention with two circles of liquid-gas separation annular grooves.

[0020] Figure 2 is a longitudinal structural view of the liquid-blocking cover plate corresponding to two circles of liquid-gas separation annular grooves in the present invention.

[0021] Figure 3 is a cross-sectional view of the structure of the present invention with two circles of liquid-gas separation annular grooves.

[0022] Figure 4 is a schematic view of the structure of the present invention with multiple circles of liquid-gas separation annular grooves.

[0023] Figure 5 is a cross-sectional view of the structure of the present invention with multiple circles of liquid-gas separation annular grooves.

[0024] In the figure: 1 - central hole; 2 - liquid injection hole; 3 - breather valve mounting hole; 4 - liquid-gas separation annular groove; 41 - groove wall; 5 - air exchange port; 51 - first air exchange port; 6 - liquid-blocking cover plate; 61 - sunken step; 62 - centrifugal blade; 7 - liquid-blocking plate; 8 - filtering device. Detailed implementation mode

[0025] 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.

[0026] In order to more concisely illustrate this embodiment, some components that are well-known to those skilled in the art but are not relevant to the main content of this creation will be omitted in the drawings or description. Additionally, for the sake of convenience in 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.

[0027] An end cover of a liquid-cooled motor of the present invention, as Figures 1-5 shown, is provided with a central hole 1, around which a liquid injection hole 2 for injecting coolant and a breather valve mounting hole 3 for mounting a breather valve are provided.

[0028] A liquid-gas separation annular groove 4 is provided around the central hole 1. The liquid-gas separation annular groove 4 can be arranged in multiple circles radiating around the central hole 1. The liquid-gas separation annular groove 4 is provided with an air exchange port 5. When the motor is running, coolant enters the liquid-gas separation annular groove 4, and the coolant can be thrown out through the air exchange port 5 by the centrifugal force generated by the rotation of the motor. In order to achieve the best centrifugal effect, the liquid-gas separation annular groove 4 is set as an elliptical annular groove, so that the centrifugal force on the coolant is the largest. The air exchange port 5 is arranged at the intersection of the long axis of the ellipse and the ellipse, so that under the same centrifugal force, the amount of coolant thrown out is the largest.

[0029] As Figure 1 shown, a liquid-blocking cover plate 6 covering the liquid-gas separation annular groove 4 is also provided. The liquid-blocking cover plate 6 covering the liquid-gas separation annular groove 4 forms a liquid-gas separation channel, which is a place for separating the gaseous liquid-gas mixture generated by high temperature during the operation of the motor. Among them, the covering method of the liquid-blocking cover plate 6 forming the liquid-gas separation channel and the liquid-gas separation annular groove 4 can be that the two are fixed together by bolts, riveting or even welding, etc., or the two are integrally formed.

[0030] In one solution, a liquid-gas separation annular groove 4 is arranged in one circle around the central hole 1. Since when the motor is running, the rotation of the rotor will drive the coolant to the entire internal cavity of the motor, in order to prevent the coolant above the air exchange port 5 from directly dripping into the air exchange port 5, a liquid-blocking plate 7 is provided at the air exchange port 5 to prevent the coolant from directly entering the liquid-gas separation annular groove 4 through the air exchange port 5.

[0031] To achieve a better liquid-gas separation effect, it is necessary to make the liquid-gas separation path formed by covering the liquid-blocking cover plate 6 on the liquid-gas separation annular groove 4 as long as possible. In order to extend the liquid-gas separation channel as much as possible in the narrow motor space to lengthen the running path of the liquid-gas mixture, so that the gas reaching the breather valve finally contains no or very little coolant, thus achieving the purpose of extending the service life of the breather valve.

[0032] Another solution is, as Figure 1 , Figure 4 shown, at least two circles of multi-circle liquid-gas separation annular grooves 4 are arranged from outside to inside around the central hole 1. Each circle of liquid-gas separation annular groove 4 is provided with an air exchange port 5, and the air exchange ports 5 of multiple liquid-gas separation annular grooves 4 are arranged in a staggered manner.

[0033] As Figure 1 , Figure 4 shown, when the liquid-gas separation annular groove 4 is arranged as an elliptical annular groove, the major axes of the ellipses of two adjacent circles of liquid-gas separation annular grooves 4 do not coincide. In this way, it can be ensured that the positions of the air exchange ports 5 of the inner and outer circles of liquid-gas separation annular grooves 4 are staggered, especially the air exchange ports 5 of two adjacent liquid-gas separation annular grooves 4 must be staggered.

[0034] To increase the gas exchange efficiency, two air exchange ports 5 are arranged at the two intersections of the ellipse and the major axis of each circle of liquid-gas separation annular groove 4, and the air exchange ports 5 of each circle do not coincide. In this way, the diffusion path of the liquid-gas mixture can be lengthened. Two first air exchange ports 51 are arranged on the outermost circle of liquid-gas separation annular groove 4, and the liquid-blocking plate 7 is arranged at the first air exchange ports 51.

[0035] To ensure that the running route of the liquid-gas mixture is to enter the innermost circle of liquid-gas separation annular groove 4 in sequence from outside to inside, the liquid-gas separation annular grooves 4 arranged around the central hole 1 are such that the height of the groove wall 41 forming the liquid-gas separation annular groove 4 decreases successively from outside to inside.

[0036] At the same time, as Figure 2 , Figure 3 , Figure 5 shown, the liquid-blocking cover plate 6 is provided with recessed steps 61 corresponding to the height of the groove wall 41 of each liquid-gas separation annular groove from outside to inside. Each recessed step 61 and the corresponding liquid-gas separation annular groove 4 are covered to form a liquid-gas separation channel. In this way, not only the running route of the liquid-gas mixture is extended, making the coolant in the liquid-gas mixture liquefy as much as possible in the outer circle and the atomized coolant condenses in the liquid-gas separation annular groove 4 and is centrifugally thrown out during the process of entering from outside to inside in sequence. Moreover, the diameters of the air exchange ports 5 decrease successively from outside to inside, making it gradually more difficult for the liquefied coolant to enter the inner circle.

[0037] Of course, it is impossible to completely centrifugally throw out the coolant. To ensure that the liquid-gas mixture is fully separated and only air remains when reaching the breather valve finally, asFigure 1 As shown, a filtering device 8 is arranged in the liquid-gas separation ring groove 4. Since the motor coolant usually uses cooling oil, the filtering device 8 can be composed of materials with oil-repellent properties such as stainless steel mesh, glass fiber or polyurethane. The small holes on the filter screen condense the blocked oil mist into oil droplets, which are retained in the filtering device 8. Then, under the action of centrifugal force, the oil is thrown out of the filter screen and flows out along the elliptical liquid-gas separation ring groove 4.

[0038] In order to increase the centrifugal action on the coolant and minimize the amount of coolant entering the liquid-gas separation ring groove 4, centrifugal blades 62 are arranged on the outer surface of the liquid blocking cover plate 6.

[0039] 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 to the content of the scope of the patent application of the present invention should fall within the technical scope of the present invention.

Claims

1. An end cover of a liquid-cooled motor, comprising a central hole (1), and a liquid injection hole (2) and a breathable valve mounting hole (3) arranged around the central hole (1); Features: A liquid-gas separation annular groove (4) is arranged around the central hole (1), and the liquid-gas separation annular groove (4) is provided with an air exchange port (5); a liquid blocking cover plate (6) covering the liquid-gas separation annular groove (4) is also arranged, and the liquid blocking cover plate (6) covers the liquid-gas separation annular groove (4) to form a liquid-gas separation channel.

2. The end cover of the liquid-cooled motor according to claim 1, characterized in that: A liquid-gas separation annular groove (4) is arranged around the central hole (1), and a liquid blocking plate (7) is arranged at the air exchange port (5).

3. The end cover of the liquid-cooled motor according to claim 1, characterized in that: At least two circles of liquid-gas separation annular grooves (4) are arranged from the outside to the inside around the central hole (1), each circle of the liquid-gas separation annular grooves (4) is provided with an air exchange port (5), and the air exchange ports (5) of the multiple liquid-gas separation annular grooves (4) are arranged in staggered positions.

4. The end cover of the liquid-cooled motor according to claim 3, characterized in that: The liquid-gas separation annular groove (4) is arranged as an elliptical annular groove, and the air exchange port (5) is arranged at the intersection of the major axis of the ellipse and the ellipse.

5. The end cover of the liquid-cooled motor according to claim 4, characterized in that: The elliptical major axes of two adjacent circles of liquid-gas separation annular grooves (4) do not overlap, and each circle of liquid-gas separation annular grooves (4) is provided with two air exchange ports (5) at two intersections of the ellipse and the major axis, and the outermost circle of liquid-gas separation annular grooves (4) is provided with two first air exchange ports (51).

6. The end cover of the liquid-cooled motor according to claim 5, characterized in that: The liquid blocking plate (7) is arranged at the first air exchange port (51).

7. The end cover of the liquid-cooled motor according to claim 3, characterized in that: The liquid-gas separation annular groove (4) is arranged around the central hole (1), and the groove wall (41) constituting the liquid-gas separation annular groove (4) has a height that decreases from the outside to the inside.

8. The end cover of the liquid-cooled motor according to claim 7, characterized in that: The liquid retaining cover plate (6) is provided with recessed steps (61) corresponding to the height of the groove wall (41) of each liquid-gas separation annular groove from the outside to the inside, and each recessed step (61) covers the corresponding liquid-gas separation annular groove (4) to form a liquid-gas separation channel. The diameter of each air exchange port (5) decreases from the outside to the inside.

9. The end cover of the liquid-cooled motor according to claim 1, characterized in that: Centrifugal blades (62) are arranged on the outer surface of the liquid retaining cover plate (6).

10. The end cover of the liquid-cooled motor according to claim 1, characterized in that: A filtering device (8) is arranged in the liquid-gas separation annular groove (4).

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