End cover of liquid-cooled motor

Abstract

The present invention relates to an end cover of a liquid-cooled motor. A central hole is formed at the end cover; a liquid injection hole and an air-permeable valve mounting hole are formed around the central hole; a liquid-gas separation ring groove is formed around the central hole; air exchange ports are formed at the liquid-gas separation ring groove; a liquid-blocking cover plate covering the liquid-gas separation ring groove is further 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 ring groove is arranged around the central hole, and liquid-blocking plates are provided at the air exchange ports. In the present invention, by forming the liquid-gas separation ring groove or multiple liquid-gas separation ring grooves, the effect of fully separating a gaseous coolant-air mixture produced during motor operation under a high temperature is achieved, thereby solving the problem in the prior art of a coolant damaging the air permeability of an air-permeable valve.

Description

End cover of liquid-cooled motor TECHNICAL FIELD

[0001] The present application relates to the technical field of hub motors, in particular to an end cover of a liquid-cooled motor. BACKGROUND

[0002] The motor generates heat during operation. In order to quickly dissipate heat from the motor core and maintain the motor at an appropriate temperature range for efficient operation, an insulating liquid is injected into the motor to achieve the purpose of quickly dissipating heat from the motor. In an oil-cooled motor, due to the high temperature and high-speed rotating rotor, part of the cooling liquid inside the motor housing is atomized, forming a gaseous liquid-gas mixture, which causes the pressure inside the motor housing to be too high, posing a great challenge to the motor seal. The motor with poor sealing performance may leak oil outward at this time, so the oil-cooled motor housing must be depressurized.

[0003] The commonly used method in the prior art is to install an air breather valve on the motor housing, and use the air breather membrane on the air breather valve to exchange air inside and outside the motor. However, the high temperature of the motor in operation causes the cooling liquid to atomize and form a gaseous liquid-gas mixture, which also diffuses to the air breather valve. When the atomized cooling liquid in the liquid-gas mixture cools down to form liquid droplets, it will adhere to the air breather membrane, eventually causing the air breather membrane to lose its gas permeability. Therefore, how to prevent the liquid-gas mixture from diffusing to the air breather valve is a problem that needs to be solved for current liquid-cooled motors.

[0004] Chinese patent application CN117639352A discloses a liquid-cooled motor liquid-blocking labyrinth structure, which includes a mounting plate, a center hole is provided on the mounting plate, a labyrinth liquid-blocking piece is mounted on the mounting plate, the labyrinth liquid-blocking piece is in an annular structure and is distributed around the center hole, an air permeation passage is provided in the labyrinth liquid-blocking piece, a first air permeation opening and a second air permeation opening are provided on the labyrinth liquid-blocking piece and communicate with the air permeation passage, a main liquid-blocking plate is provided at each air permeation opening; a gas permeation valve mounting hole is provided on the labyrinth liquid-blocking piece and / or the mounting plate for mounting the gas permeation valve, and the gas entering the air permeation passage through the air permeation opening can be discharged through the gas permeation valve mounted on the gas permeation valve mounting hole.

[0005] The above-mentioned labyrinth structure tries to block the cooling liquid outside the air permeation opening by the main liquid-blocking plate; however, some cooling liquid may enter the air permeation passage through the air permeation opening. Since the labyrinth liquid-blocking piece is in an annular structure and is distributed around the center hole, the centrifugal force generated by the rotation of the rotor can throw out the part of the cooling liquid from the air permeation opening, thereby minimizing the possibility of the cooling liquid contacting the air permeation valve, and the air permeation valve can work stably for a long time, ensuring the balance of the air pressure inside and outside the motor at all times.

[0006] The technical solution can theoretically avoid the contact between the cooling liquid and the air passage valve, but 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, the labyrinth structure has only one air passage, the path for the liquid-gas mixture to run is too short, the liquid cooling liquid may be thrown out by centrifugal force, but a certain amount of liquid-gas mixture that has not condensed into gas will reach the air passage valve, and when the liquid-gas mixture condenses, the cooling liquid in the liquid-gas mixture will still adhere to the air passage film, damaging the permeability of the air passage film, thereby affecting the balance of the air pressure inside and outside the motor, and the whole labyrinth liquid blocking piece structure is complex, and the mold manufacturing cost is high. SUMMARY

[0007] The purpose of the present application is to provide an end cover of a liquid-cooled motor, which achieves the effect of fully separating the gaseous cooling liquid and air mixture generated by the high temperature of the motor in operation by the arrangement of the liquid-gas separation ring groove and the multi-ring liquid-gas separation ring groove, and solves the problem of the air permeability of the air passage valve damaged by the cooling liquid in the prior art.

[0008] To achieve the above-mentioned purpose, the technical solution of the present application is:

[0009] An end cover of a liquid-cooled motor is provided with a center hole, a liquid injection hole and an air passage valve mounting hole are arranged around the center hole;

[0010] A liquid-gas separation ring groove is arranged around the center hole, and the liquid-gas separation ring groove is provided with an air exchange port; a liquid blocking cover plate is further arranged on the liquid-gas separation ring groove, and the liquid blocking cover plate is arranged on the liquid-gas separation ring groove to form a liquid-gas separation channel.

[0011] One ring of liquid-gas separation ring grooves is arranged around the center hole, and a liquid blocking plate is arranged at the air exchange port.

[0012] At least two rings of multi-ring liquid-gas separation ring grooves are arranged around the center hole from the outside to the inside, each ring of liquid-gas separation ring grooves is provided with an air exchange port, and the air exchange ports of the plurality of liquid-gas separation ring grooves are arranged in a staggered manner.

[0013] The liquid-gas separation ring groove is arranged as an elliptical ring groove, and the air exchange port is arranged at the intersection of the elliptical long axis and the ellipse.

[0014] The elliptical long axes of the two adjacent rings 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 ring of liquid-gas separation ring grooves, and two first air exchange ports are arranged in the outermost ring of liquid-gas separation ring grooves.

[0015] The liquid blocking plate is arranged at the first air exchange port.

[0016] The liquid-gas separation ring grooves arranged around the center hole, and the groove wall heights of the liquid-gas separation ring grooves are gradually reduced from the outside to the inside.

[0017] The liquid blocking cover plate is provided with recessed steps corresponding to the height of the groove wall of each liquid-gas separation groove from outside to inside, and each recessed step covers each corresponding liquid-gas separation groove to form a liquid-gas separation channel, and the caliber of each air exchange port decreases from outside to inside.

[0018] The outer surface of the liquid blocking cover plate is provided with centrifugal blades.

[0019] A filtering device is arranged in the liquid-gas separation groove.

[0020] The advantages of the present application are as follows: 1. The liquid-gas separation grooves surrounding the center hole can use centrifugal force to throw out the cooling liquid entering the liquid-gas separation groove; 2. The multiple rings of liquid-gas separation grooves surrounding the center hole can prolong the running path of the atomized cooling liquid and air mixed into gaseous liquid-gas mixture generated by the high temperature of the motor, so that the atomized cooling liquid in the liquid-gas mixture has sufficient condensation time, achieving the effect of sufficient liquid-gas separation; 3. The liquid blocking plate can block the cooling liquid above the air exchange port from entering the liquid-gas separation groove; 4. The liquid-gas separation groove is arranged in an elliptical shape, and the air exchange port is arranged on the major axis of the ellipse, which can achieve the best centrifugal effect; 5. The filtering device arranged in the liquid-gas separation groove can retain the condensed cooling liquid during the running of the liquid-gas mixture, and then throw it out of the liquid-gas separation groove by centrifugal force, further improving the liquid-gas separation effect and ensuring that the cooling liquid does not enter the position of the air passage valve; 6. The multiple rings of liquid-gas separation grooves 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 to the air passage valve, achieving the best liquid-gas separation effect; 7. The air exchange ports of each liquid-gas separation groove decrease in caliber from outside to inside, which reduces the possibility of cooling liquid entering the innermost ring of liquid-gas separation grooves, 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 cooling liquid entering the liquid-gas separation groove. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 is an exploded view of the structure of the present application containing two rings of liquid-gas separation grooves.

[0022] Fig. 2 is a longitudinal structure view of the liquid blocking cover plate corresponding to the two rings of liquid-gas separation grooves in the present application.

[0023] Fig. 3 is a cross-sectional view of the structure of the present application containing two rings of liquid-gas separation grooves.

[0024] Fig. 4 is a structure diagram of the present application containing multiple rings of liquid-gas separation grooves.

[0025] Fig. 5 is a cross-sectional view of the structure of the present application containing multiple rings of liquid-gas separation grooves.

[0026] In the figure: 1 - center hole; 2 - liquid injection hole; 3 - air exchange valve mounting hole; 4 - liquid-gas separation ring groove; 41 - groove wall; 5 - air exchange port; 51 - first air exchange port; 6 - liquid blocking cover plate; 61 - recessed step; 62 - centrifugal blade; 7 - liquid blocking plate; 8 - filter device. DETAILED DESCRIPTION

[0027] The application will be further described below in conjunction with the accompanying drawings. The drawings are only used for illustrative description and cannot be understood as limiting the patent.

[0028] In order to more simply illustrate the embodiment, some parts which are well known to those skilled in the art but not related to the main content of the present invention will be omitted in the drawings or description. In addition, some parts will be omitted, enlarged or reduced in the drawings for the convenience of description, but do not represent the size or the whole structure of the actual product.

[0029] The end cover of the liquid-cooled motor of the present application is shown in Figures 1-5, which is provided with a center hole 1, a liquid injection hole 2 around the center hole 1 for injecting cooling liquid, and an air exchange valve mounting hole 3 for mounting an air exchange valve.

[0030] A liquid-gas separation ring groove 4 is arranged around the center hole 1, which can be arranged in multiple circles with the center hole 1 as the center. The liquid-gas separation ring groove 4 is provided with an air exchange port 5. When the motor is running, cooling liquid enters the liquid-gas separation ring groove 4, which can be thrown out of the air exchange port 5 by the centrifugal force of the motor rotation. In order to achieve the best centrifugal effect, the liquid-gas separation ring groove 4 is arranged as an oval groove, so that the centrifugal force on the cooling liquid is the largest. The air exchange port 5 is arranged at the intersection of the oval long axis and the oval, so that under the action of the same centrifugal force, the amount of cooling liquid thrown out is the largest.

[0031] As shown in Figure 1, a liquid blocking cover plate 6 is further arranged to cover the liquid-gas separation ring groove 4. 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 during the operation of the motor. Among them, the covering way of the liquid blocking cover plate 6 and the liquid-gas separation ring groove 4 can be fixed together by means of bolts, riveting or even welding, or they can be integrally formed.

[0032] One scheme is to arrange a circle of liquid-gas separation ring grooves 4 around the center hole 1. Since the rotor rotation will drive the cooling liquid into the entire motor cavity during the operation of the motor, in order to prevent the cooling liquid 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 cooling liquid from directly entering the liquid-gas separation ring groove 4 through the air exchange port 5.

[0033] In order to achieve better liquid-gas separation effect, the liquid-gas separation passage path formed by the liquid blocking cover plate 6 covering the liquid-gas separation ring groove 4 should be as long as possible. In order to prolong the liquid-gas separation passage path in the narrow motor space as much as possible, the liquid-gas mixture runs, so that the gas containing no or very little cooling liquid finally reaches the air permeation valve, achieving the purpose of prolonging the service life of the air permeation valve.

[0034] Another solution is that, as shown in FIG. 1 and FIG. 4, at least two rings of liquid-gas separation ring grooves 4 are arranged around the central hole 1 from outside to inside, each ring of liquid-gas separation ring grooves 4 is provided with an air exchange port 5, and the air exchange ports 5 of the multiple liquid-gas separation ring grooves 4 are arranged staggered.

[0035] As shown in FIG. 1 and FIG. 4, when the liquid-gas separation ring groove 4 is arranged as an elliptical ring groove, the major axes of the two adjacent rings of liquid-gas separation ring grooves 4 do not coincide, so that the positions of the air exchange ports 5 of the inner and outer rings of liquid-gas separation ring grooves 4 are staggered, especially the air exchange ports 5 of the two adjacent liquid-gas separation ring grooves 4 are staggered.

[0036] In order to increase the gas exchange efficiency, two air exchange ports 5 are arranged at each intersection of the ellipse and the major axis of each ring of liquid-gas separation ring grooves 4, and the air exchange ports 5 of each ring do not coincide, so that the diffusion path of the liquid-gas mixture is lengthened. The outermost ring of liquid-gas separation ring grooves 4 is provided with two first air exchange ports 51, and the liquid blocking plate 7 is arranged at the first air exchange port 51.

[0037] In order to ensure that the running route of the liquid-gas mixture is sequentially from outside to inside into the innermost ring of liquid-gas separation ring grooves 4, the liquid-gas separation ring grooves 4 arranged around the central hole 1 are arranged in a manner that the heights of the groove walls 41 constituting the liquid-gas separation ring grooves 4 are gradually reduced from outside to inside.

[0038] At the same time, as shown in FIG. 2, FIG. 3 and FIG. 5, the liquid blocking cover plate 6 is provided with recessed steps 61 corresponding to the heights of the groove walls 41 of each liquid-gas separation ring groove from outside to inside, and each recessed step 61 covers the corresponding liquid-gas separation ring groove 4 to form a liquid-gas separation passage. In this way, not only the running route of the liquid-gas mixture is lengthened, but also the cooling liquid in the liquid-gas mixture is liquefied as much as possible in the outer ring, and the atomized cooling liquid is condensed in the liquid-gas separation ring groove 4 and is thrown out by centrifugal force during the process of sequentially entering from outside to inside. Moreover, the diameters of the air exchange ports 5 are gradually reduced from outside to inside, so that the difficulty of the liquefied cooling liquid entering the inner ring is gradually increased.

[0039] Of course, the coolant liquid cannot be completely centrifuged out, in order to ensure that the liquid-gas mixture is fully separated, and only air is left when reaching the air vent, as shown in Fig. 1, a filtering device 8 is arranged in the liquid-gas separation ring groove 4. Since the motor coolant liquid is usually oil, the filtering device 8 can be made of stainless steel mesh, glass fiber or polyurethane, etc. with oil repellent properties. The small holes on the filter screen block the oil mist to condense into oil droplets, which are retained in the filtering device 8. Under the action of centrifugal force, the oil droplets are thrown out of the filter screen and flow out along the oval liquid-gas separation ring groove 4.

[0040] In order to increase the centrifugal effect on the coolant liquid and reduce the amount of coolant liquid entering the liquid-gas separation ring groove 4, centrifugal blades 62 are arranged on the outer surface of the liquid blocking cover plate 6.

[0041] The above description is only the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any equivalent changes and modifications made in accordance with the content of the present application should be within the technical scope of the present application.

Claims

1. A liquid-cooled motor end cover, which is provided with a central hole (1), a liquid injection hole (2) and a breather valve mounting hole (3) arranged around the central hole (1); a liquid-gas separation ring groove (4) is arranged around the central hole (1), and the liquid-gas separation ring groove (4) is provided with an air exchange port (5); a liquid blocking cover plate (6) is further arranged on the liquid-gas separation ring groove (4), and the liquid blocking cover plate (6) covers the liquid-gas separation ring groove (4) to form a liquid-gas separation channel. characterized in that A liquid blocking plate (7) is arranged at the air exchange port (5).

2. The end cover of a liquid-cooled electric machine according to claim 1, characterized in that: A plurality of liquid-gas separation ring grooves (4) are arranged around the central hole (1) from outside to inside, and each liquid-gas separation ring groove (4) is provided with an air exchange port (5), and the air exchange ports (5) of the plurality of liquid-gas separation ring grooves (4) are arranged in a staggered manner.

3. The liquid-cooled motor endshield of claim 1, wherein: The liquid-gas separation ring groove (4) is arranged as an oval ring groove, and the air exchange port (5) is arranged at the intersection of the oval long axis and the oval.

4. The end cover of a liquid-cooled electric machine according to claim 3, characterized in that: The oval long axes of the liquid-gas separation ring grooves (4) of adjacent two rings do not coincide with each other, two air exchange ports (5) are arranged at the two intersections of the oval and the long axis of each liquid-gas separation ring groove (4), and the outermost liquid-gas separation ring groove (4) is provided with two first air exchange ports (51).

5. The liquid-cooled motor endshield of claim 4, wherein: The liquid blocking plate (7) is arranged at the first air exchange port (51).

6. The end cover of a liquid-cooled electric machine according to claim 5, characterized in that: The liquid-gas separation ring grooves (4) arranged around the central hole (1) are formed by groove walls (41), and the heights of the groove walls (41) gradually decrease from outside to inside.

7. The liquid-cooled motor endshield of claim 3, wherein: The liquid blocking cover plate (6) is provided with recessed steps (61) corresponding to the heights of the groove walls (41) of the liquid-gas separation ring grooves from outside to inside, and each recessed step (61) and the corresponding liquid-gas separation ring groove (4) form a liquid-gas separation channel, and the diameters of the air exchange ports (5) gradually decrease from outside to inside.

8. The end cover of a liquid-cooled electric machine according to claim 7, characterized in that: The outer surface of the liquid blocking cover plate (6) is provided with centrifugal blades (62).

9. The liquid-cooled motor endshield of claim 1, wherein: A filter device (8) is arranged in the liquid-gas separation ring groove (4).

10. The liquid-cooled motor endshield of claim 1, wherein: ​

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