Liquid-gas separation structure of liquid-cooled motor

Abstract

The utility model relates to a liquid-gas separation structure of a liquid-cooled motor, which comprises a motor end cover, the motor end cover is provided with a central hole, one or more circles of liquid-gas separation channels are arranged around the central hole, and the liquid-gas separation channels are provided with air exchange ports. The liquid-gas separation channel comprises a liquid-gas separation ring groove and a liquid blocking cover plate, and the liquid blocking cover plate covers the liquid-gas separation ring groove to form the liquid-gas separation channel; and the air exchange port is formed in the liquid-gas separation ring groove. 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 liquid-gas mixture is achieved, and the problem that in the prior art, cooling liquid damages the breathability of the ventilation valve is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of in-wheel motors, and particularly to a liquid-gas separation structure 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 motor with an oil-cooling method, due to the action of high temperature and a high-speed rotating rotor, part of the cooling oil in 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, 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 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. The liquid-blocking labyrinth member is also included and is mounted on the mounting plate. The liquid-blocking labyrinth member is of an annular structure and is distributed around the central hole. An air-permeable channel is provided inside the liquid-blocking labyrinth member. A first air-permeable port and a second air-permeable port communicating with the air-permeable channel are provided on the liquid-blocking labyrinth member. A main liquid-blocking plate is arranged at each air-permeable port. The liquid-blocking labyrinth member and / or the mounting plate are / is also provided with an air-permeable valve mounting hole for mounting a breather valve. 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 liquid-blocking labyrinth 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-permeable port, thereby minimizing the possibility of the coolant contacting the breather valve to the greatest extent, 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 move 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, thereby 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 purpose of the present invention is to provide a liquid-gas separation structure for a liquid-cooled motor. By setting up a liquid-gas separation ring groove and multiple circles of liquid-gas separation ring grooves, the effect of fully separating the coolant and the gas is achieved, and the problem that the existing technology's coolant 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:

[0009] A liquid-gas separation structure for a liquid-cooled motor, which includes a motor end cover. The motor end cover is provided with a central hole, and one or more circles of liquid-gas separation channels are arranged around the central hole. The liquid-gas separation channels are provided with air exchange ports.

[0010] The liquid-gas separation channel includes a liquid-gas separation ring groove and a liquid-blocking cover plate. The liquid-blocking cover plate covers the liquid-gas separation ring groove to form the liquid-gas separation channel; the air exchange port is arranged in the liquid-gas separation ring groove.

[0011] One 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.

[0012] At least two circles of multiple liquid-gas separation ring grooves are arranged around the central hole from the outside to the inside. 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.

[0013] 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.

[0014] The long axes of the ellipses of two adjacent circles of liquid-gas separation ring grooves do not coincide, so as to ensure that the positions of the air exchange ports of the inner and outer circles of liquid-gas separation ring grooves 4 are staggered. In particular, the air exchange ports 5 of two adjacent liquid-gas separation ring grooves 4 must be staggered.

[0015] Two air exchange ports are arranged at the two intersections of each circle of liquid-gas separation ring groove with its long axis, and two first air exchange ports are arranged at the outermost circle of liquid-gas separation ring groove.

[0016] The liquid-blocking plate is arranged at the first air exchange port.

[0017] A liquid-gas separation annular groove is arranged around the central hole, and the heights of the groove walls forming the liquid-gas separation annular groove decrease successively from outside to inside.

[0018] The liquid-blocking cover plate is provided with sunken steps corresponding to the heights of the groove walls of the liquid-gas separation annular grooves from outside to inside. Each sunken step and the corresponding liquid-gas separation annular groove are covered to form a liquid-gas separation channel, and the diameters of the air exchange ports decrease successively from outside to inside.

[0019] Centrifugal blades are arranged on the outer surface of the liquid-blocking cover plate.

[0020] The advantages of the present utility model are as follows: 1. The liquid-gas separation annular groove around the central hole can use centrifugal force to throw out the coolant entering the liquid-gas separation annular groove; 2. Multiple circles of liquid-gas separation annular grooves are arranged 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, so that the atomized coolant in the liquid-gas mixture has 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 to be elliptical, and the air exchange port is arranged on the long axis of the ellipse, which can achieve the best centrifugal effect; 5. The heights of the multiple circles of liquid-gas separation annular grooves decrease successively from outside to inside, and the liquid-blocking cover plate is provided with corresponding sunken steps to ensure that the gaseous liquid-gas mixture diffuses along the designed route to the air permeable valve to achieve the best liquid-gas separation effect; 6. The air exchange ports of each liquid-gas separation annular groove 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; 7. 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; 8. The structure is not complex, which is convenient for making molds and the cost is not high. Description of the Drawings

[0021] Figure 1 It is an exploded view of the structure of the present utility model with two circles of liquid-gas separation annular grooves.

[0022] Figure 2 It is a longitudinal structural view of the liquid-blocking cover plate corresponding to two circles of liquid-gas separation annular grooves in the present utility model.

[0023] Figure 3 It is a cross-sectional view of the structure of the present utility model with two circles of liquid-gas separation annular grooves.

[0024] Figure 4 It is a schematic diagram of the structure of the present utility model with multiple circles of liquid-gas separation annular grooves.

[0025] Figure 5 It is a cross-sectional view of the structure of the present utility model with multiple circles of liquid-gas separation annular grooves.

[0026] In the figure: 1 - Central hole; 2 - Motor end cover; 4 - Liquid-gas separation annular groove; 41 - Groove wall; 5 - Air exchange port; 51 - First air exchange port; 6 - Liquid-blocking cover plate; 61 - Concave step; 62 - Centrifugal blade; 7 - Liquid-blocking plate. Detailed implementation mode

[0027] The following further describes the present utility model in conjunction with the accompanying drawings. The accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent.

[0028] For a 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. Additionally, for ease of expression, some components in the drawings will be omitted, enlarged, or reduced, but this does not represent the dimensions or entire structure of the actual product.

[0029] A liquid-gas separation structure of a liquid-cooled motor of the present utility model, as Figures 1-5 shown, it includes a motor end cover 2. The motor end cover 2 is provided with a central hole 1, and one or more circles of liquid-gas separation channels are arranged around the central hole 1, and an air exchange port 5 is arranged in the liquid-gas separation channel.

[0030] As Figure 1 shown, the liquid-gas separation channel includes a liquid-gas separation annular groove 4 and a liquid-blocking cover plate 6. 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 annular groove 4 is arranged around the central hole 1, and the liquid-gas separation annular groove 4 can be arranged in one or more circles radiating with the central hole 1 as the center, and the air exchange port 5 is arranged in the liquid-gas separation annular groove 4. Among them, the covering manner of the liquid-blocking cover plate 6 and the liquid-gas separation annular groove 4 that form the liquid-gas separation channel can be that the two are fixed together by bolts, riveting, or even welding, etc., or the two are integrally formed.

[0031] When the motor operates, the coolant enters the liquid-gas separation annular groove 4, and the coolant can be thrown out from 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, and 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 the thrown-out coolant is the largest.

[0032] As Figure 1 、 Figure 3 、 Figure 4 、 Figure 5As shown in the figure, the liquid-gas separation channel is a place for separating the liquid-gas mixture generated by the high temperature during the operation of the motor. In one solution, a liquid-gas separation ring groove 4 is arranged in a circle around the central hole 1. Since the rotor rotates during the operation of the motor, the coolant will be driven into the entire internal cavity of the motor. 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 arranged at the air exchange port 5 to prevent the coolant from directly entering the liquid-gas separation ring groove 4 through the air exchange port 5.

[0033] 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 no or very little coolant, so as to achieve the purpose of extending the service life of the breather valve. Another solution is, as Figure 1 、 Figure 4 shown in the figure, at least two circles of multi-circle liquid-gas separation ring grooves 4 are arranged around the central hole 1 from the outside to the inside. An air exchange port 5 is arranged in each circle of the liquid-gas separation ring groove 4, and the air exchange ports 5 of the multiple liquid-gas separation ring grooves 4 are arranged in a staggered manner.

[0034] As Figure 1 、 Figure 4 shown in the figure, when the liquid-gas separation ring groove 4 is set as an elliptical ring groove, the long axes of the ellipses of the adjacent two circles of liquid-gas separation ring grooves 4 do not coincide. Two air exchange ports 5 are arranged at the two intersections of the ellipse and the long axis of each circle of the liquid-gas separation ring groove 4. In this way, the gas exchange efficiency can be increased, and the air exchange ports 5 of each circle will not coincide, so that the diffusion path of the liquid-gas mixture can be lengthened. Two first air exchange ports 51 are arranged on the outermost liquid-gas separation ring groove 4, and the liquid blocking plate 7 is arranged at the first air exchange port 51.

[0035] In order to ensure that the running route of the liquid-gas mixture enters the innermost liquid-gas separation ring groove 4 in sequence from the outside to the inside, the liquid-gas separation ring grooves 4 arranged around the central hole 1 are such that the height of the groove wall 41 forming the liquid-gas separation ring groove 4 decreases in turn from the outside to the inside.

[0036] At the same time, as Figure 2 、 Figure 3 、 Figure 5As shown in the figure, the liquid blocking cover plate 6 is provided with a concave step 61 corresponding to the height of the groove wall 41 of each liquid-gas separation ring groove from the outside to the inside. Each concave step 61 and the corresponding liquid-gas separation ring groove 4 are covered to form a liquid-gas separation channel. In this way, not only is the running route of the liquid-gas mixture extended, so that the coolant in the liquid-gas mixture is liquefied as much as possible on the outer ring, and the atomized coolant condenses in the liquid-gas separation ring groove 4 and is centrifugally thrown out during the process of entering sequentially from the outside to the inside. Moreover, the diameters of the air exchange ports 5 gradually decrease from the outside to the inside, making it gradually more difficult for the liquefied coolant to enter the inner ring. The liquid-gas mixture is fully separated, and only air remains when it finally reaches the breather valve.

[0037] In order to increase the centrifugal effect on the coolant and minimize the amount of coolant entering the liquid-gas separation ring groove 4, centrifugal blades 62 are provided on the outer surface of the liquid blocking cover plate 6.

[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 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. A liquid-gas separation structure for a liquid-cooled motor, characterized in that: It comprises a motor end cover (2), the motor end cover (2) being provided with a central hole (1), one or more circles of liquid-gas separation channels being arranged around the central hole (1), and the liquid-gas separation channels being provided with an air exchange port (5).

2. The liquid-gas separation structure of the liquid-cooled motor according to claim 1, characterized in that: The liquid-gas separation channel comprises a liquid-gas separation annular groove (4) and a liquid blocking cover plate (6), wherein the liquid blocking cover plate (6) covers the liquid-gas separation annular groove (4) to form the liquid-gas separation channel; and the air exchange port (5) is arranged in the liquid-gas separation annular groove (4).

3. The liquid-gas separation structure of the liquid-cooled motor according to claim 2, 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).

4. The liquid-gas separation structure of the liquid-cooled motor according to claim 2, 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.

5. The liquid-gas separation structure of the liquid-cooled motor according to claim 4, 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.

6. The liquid-gas separation structure of the liquid-cooled motor according to claim 5, 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).

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

8. The liquid-gas separation structure of the liquid-cooled motor according to claim 4, 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.

9. The liquid-gas separation structure of the liquid-cooled motor according to claim 8, 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.

10. The liquid-gas separation structure of the liquid-cooled motor according to claim 2, characterized in that: Centrifugal blades (62) are arranged on the outer surface of the liquid retaining cover plate (6).

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