Oil-gas separation device of oil-cooled motor

Abstract

The application relates to an oil-gas separation device of an oil-cooled motor, which comprises an end cover provided with a central hole, the outer wall of the central hole is provided with an oil injection hole and a breather valve mounting hole; an oil baffle is arranged in the end cover, and an oil-gas separator is arranged between the outer wall of the central hole and the oil baffle; the oil-gas separator comprises an upper cover plate, a lower cover plate and a filter core piece arranged between the upper cover plate and the lower cover plate. The oil-gas separator is arranged, so that the gaseous cooling liquid generated by the high temperature of the motor operation and the air mixture can be fully separated, the oil-gas separator is convenient to replace, the service life of the motor is prolonged, and the problem that the cooling liquid damages the air permeability of the breather valve in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of hub motor technology, specifically to an oil-gas separation device for an oil-cooled motor. Background Technology

[0002] Motors generate heat during operation. To quickly dissipate heat from the motor core and maintain high efficiency within a suitable temperature range, insulating liquid is injected inside the motor to achieve rapid heat dissipation. In oil-cooled motors, the high temperature and high-speed rotation of the rotor cause some of the coolant inside the motor housing to atomize, forming a gaseous liquid-gas mixture. This results in excessively high pressure inside the motor housing, posing a significant challenge to the motor's seal. Motors with poor sealing will then leak oil. Therefore, it is necessary to depressurize the inside of the oil-cooled motor housing.

[0003] The commonly used method in current technology is to install a vent valve on the motor housing, utilizing the vent membrane on the vent valve for gas exchange between the inside and outside of the motor. However, the high temperature of the motor during operation causes the coolant to atomize, and the resulting gaseous liquid-gas mixture diffuses to the vent valve. When the atomized coolant in the liquid-gas mixture cools and condenses into droplets, it adheres to the vent membrane, ultimately causing the vent membrane to lose its gas permeability. Therefore, preventing the liquid-gas mixture from diffusing to the vent valve is a problem that current liquid-cooled motors need to solve.

[0004] Chinese invention application CN117639352A discloses a liquid-cooled motor liquid-blocking labyrinth structure, including a mounting plate with a central hole, and a labyrinth liquid-blocking component mounted on the mounting plate. The labyrinth liquid-blocking component has a ring structure and is distributed around the central hole. The labyrinth liquid-blocking component has a venting channel, and the labyrinth liquid-blocking component has a first vent and a second vent communicating with the venting channel. Each vent is provided with a main liquid-blocking plate. The labyrinth liquid-blocking component and / or the mounting plate are provided with a vent valve mounting hole for installing a vent valve. Gas entering the venting channel through the vent can be discharged through the vent valve installed in the vent valve mounting hole.

[0005] The aforementioned labyrinth structure aims to block coolant from entering the vent. However, some coolant may still enter the venting channel through the vent. Since the labyrinth baffle is a ring structure distributed around the central hole, the centrifugal force generated by the rotor rotation will throw this portion of coolant out of the vent, minimizing the possibility of coolant contacting the vent valve. The vent valve can maintain stable operation for a long time, ensuring the balance of air pressure inside and outside the motor at all times.

[0006] The above technical solution can theoretically avoid contact between the coolant and the vent valve. However, the main factor affecting air exchange in liquid-cooled motors is the liquid-gas mixture generated by the high temperature of the motor. Because the above labyrinth structure has only one vent channel, the path for the liquid-gas mixture is too short. The liquid coolant may be centrifugally ejected, but a certain amount of uncondensed liquid-gas mixture will still reach the vent valve. When the liquid-gas mixture condenses, the coolant will still adhere to the vent membrane, damaging the permeability of the vent membrane and thus affecting the balance of air pressure inside and outside the motor. In addition, the entire labyrinth liquid-blocking component structure is complex and the mold manufacturing cost is high. Summary of the Invention

[0007] The purpose of this invention is to provide an oil-gas separation device for an oil-cooled motor. By setting up an oil-gas separator, the gaseous mixture of cooling oil and air generated by the high temperature of the motor operation can be fully separated, thus solving the problem of cooling oil damaging the permeability of the vent valve in the prior art.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows:

[0009] An oil-gas separation device for an oil-cooled motor includes an end cap with a central hole, and an oil injection hole and a vent valve mounting hole are provided on the outer wall of the central hole.

[0010] An oil baffle ring is installed inside the end cap, and an oil-gas separator is installed between the outer wall of the central hole and the oil baffle ring; the oil-gas separator includes an upper cover plate, a lower cover plate, and a filter chip installed between the upper cover plate and the lower cover plate.

[0011] The upper cover of the oil-gas separator is a circular plate with a central through hole, which is connected to the central hole. The lower cover is annular, with its inner radius being larger than the radius of the central hole. The filter chip is annular, with its outer radius being smaller than the outer radius of the lower cover and its inner radius being larger than the inner radius of the lower cover. Multiple filter chips are arranged alternately between the upper and lower covers.

[0012] The filter chip has a wavy, ring-shaped structure.

[0013] An outer support for the filter screen is set between the upper and lower cover plates and at the outer edge of the filter chip, and an inner support for the filter screen is set between the upper and lower cover plates and at the inner edge of the filter chip.

[0014] The angle between the inner wall of the oil baffle ring and the bottom of the end cap is greater than 90 degrees.

[0015] A filter device is installed between the outer wall of the central hole and the inner ring of the lower cover plate of the oil-gas separator.

[0016] The outer wall of the central hole has a protrusion formed by an oil injection hole and a vent valve mounting hole. The filter device is annular, and the inner wall of the annulus has a groove corresponding to the protrusion.

[0017] The filter device consists of a filter screen made of stainless steel mesh, glass fiber, or polyurethane.

[0018] The outer wall of the central hole is provided with mounting holes, and the upper cover plate is provided with corresponding fixing holes. The oil-gas separator is fixed inside the end cover through the fixing holes and mounting holes.

[0019] The height of the oil baffle ring is higher than the height of the oil-gas separator.

[0020] The advantages of this invention are: 1. The design of the oil baffle ring reduces the amount of cooling oil entering the oil-gas separator, and the angle between the inner wall of the oil baffle ring and the end cover is obtuse. When the motor stops rotating, the cooling oil drips out of the oil baffle ring due to gravity. 2. A filter device is installed in the space between the central hole and the oil-gas separator, which can further retain the cooling oil condensed during the operation of the liquid-gas mixture, and then throw it out by centrifugal force, further improving the oil-gas separation effect and ensuring that the cooling oil does not enter the location of the vent valve. 3. The filter chip in the oil-gas separator is wavy, and the filter chips are stacked at intervals, which increases the adhesion area of ​​oil droplets. 4. The multiple settings of the oil baffle ring, oil-gas separator, inner oil baffle ring and filter device ensure that the oil-gas mixture can be fully separated. 5. It is easy to assemble, and if there is too much oil, it can be replaced directly without cleaning. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a cross-sectional view of the structure of the present invention. Figure 1 .

[0023] Figure 3 This is a cross-sectional view of the structure of the present invention. Figure 2 .

[0024] Figure 4 This is a schematic diagram of the oil-gas separator structure in this invention.

[0025] Figure 5 This is an exploded view of the oil-gas separator structure in this invention.

[0026] Figure 6 This is a cross-sectional view of the oil-gas separator structure in this invention.

[0027] In the diagram: 1-Central hole; 11-Outer wall of central hole; 12-Mounting hole; 2-End cap; 3-Oil-gas separator; 31-Upper cover plate; 311-Central through hole; 312-Fixing hole; 32-Lower cover plate; 33-Filter chip; 34-Outer support of filter screen; 35-Inner support of filter screen; 4-Oil baffle ring; 41-Inner wall of oil baffle ring; 5-Filter device; 6-Ventilator mounting hole; 7-Oil injection hole. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0029] To simplify the description of this embodiment, some components that are well-known to those skilled in the art but are not related to the main content of this invention may be omitted in the accompanying drawings or description. Additionally, for ease of description, some components in the drawings may be omitted, enlarged, or reduced, but these do not represent the actual product dimensions or the complete structure.

[0030] An oil-gas separation device for an oil-cooled motor according to the present invention, such as Figure 1-6 As shown, it includes an end cap 2 with a central hole 1, and an air vent mounting hole 6 and an oil injection hole 7 on the outer wall 11 of the central hole.

[0031] like Figure 1-3 As shown, an oil baffle ring 4 is provided inside the end cover 2. The oil baffle ring 4 is a circular ring centered on the central hole 1. When the motor runs and drives the cooling oil, the oil baffle ring 4 blocks most of the cooling oil, preventing the cooling oil from entering the oil baffle ring 4 and thus contaminating the vent valve.

[0032] Furthermore, such as Figure 2 , 3 As shown, the angle between the inner wall 41 of the oil baffle ring and the bottom of the end cover 2 is an obtuse angle greater than 90 degrees. In this way, after the motor stops running, the cooling oil that has entered the oil baffle ring 4 will also flow downward under the action of gravity and along the inner wall 41 of the oil baffle ring to the outside of the oil baffle ring 4, instead of accumulating inside the oil baffle ring 4 and contaminating the vent valve.

[0033] like Figure 1-3 As shown, an oil-gas separator 3 is provided between the outer wall 11 of the central hole and the oil baffle ring 4; the oil-gas separator 3 includes an upper cover plate 31, a lower cover plate 32 and a filter chip 33 disposed between the upper cover plate 31 and the lower cover plate 32.

[0034] like Figure 4-6 As shown, the upper cover plate 31 of the oil-gas separator 3 is a circular plate with a central through hole 311, which is connected to the central hole 1; the lower cover plate 32 is annular, and its inner radius is larger than the radius of the central hole 1; the filter chip 33 is annular, and its outer radius is smaller than the outer radius of the lower cover plate 32, while its inner radius is larger than the inner radius of the lower cover plate 32; multiple filter chips 33 are arranged alternately between the upper cover plate 31 and the lower cover plate 32, with a gap between adjacent chips.

[0035] An outer support 34 for the filter chip 33 is provided between the upper cover plate 31 and the lower cover plate 32, at the outer edge of the filter chip 33. An inner support 35 for the filter chip 33 is provided between the upper cover plate 31 and the lower cover plate 32, at the inner edge of the filter chip 33. The filter chip 33 is fixed on the outer support 34 and the inner support 35, and a gap is maintained when the filter chip 33 is fixed.

[0036] The filter chip 33 can be made into a wavy ring structure, and the filter chips 33 can be stacked in an alternating manner, so that gaps can also be formed between the filter chips 33. Moreover, the wavy shape of the filter chip 33 also increases the adhesion area of ​​oil droplets.

[0037] Furthermore, the outer wall 11 of the central hole is provided with a mounting hole 12, and the upper cover plate 31 is provided with a corresponding fixing hole 312. The oil-gas separator 3 can be fixed in the end cover 2 by screws or other fasteners through the fixing hole 312 and the mounting hole 12, and rotate together with the end cover 2.

[0038] Similarly, the design of the oil-gas separator 3 makes it easy to disassemble and replace. When the motor has been used for a long time, the oil-gas separator 3 can be replaced to ensure the oil-gas separation effect.

[0039] During motor operation, the oil-gas separator 3 rotates together with the end cover 2. Most of the cooling oil carried by the motor rotation is blocked by the oil baffle ring 4. Only a small amount of cooling oil and the high-temperature oil-gas mixture generated during motor operation enter the oil baffle ring 4 and then into the oil-gas separator 3. The condensed oil droplets from the cooling oil and the high-temperature oil-gas mixture adhere to the filter chip 33 and are flung out by centrifugal force. Furthermore, the filter chip 33 is made into a wavy, ring-shaped structure, greatly increasing the oil droplet adhesion area. This allows more oil droplets to adhere to the filter chip 33 and be flung out by centrifugal force, significantly reducing the amount of oil droplets reaching the vent valve.

[0040] To prevent more cooling oil from entering the vicinity of the central hole 1, the height of the oil baffle ring 4 is higher than the height of the oil-gas separator 3.

[0041] like Figure 1-3 As shown, to further ensure that the gas diffused to the vent valve is free of cooling oil, a filter device 5 is installed between the outer wall 11 of the central hole and the inner ring of the lower cover plate 32 of the oil-gas separator 3. Since the outer wall 11 of the central hole has protrusions formed by the oil injection hole 7 and the vent valve mounting hole 6, the filter device 5 is correspondingly arranged in a ring shape, with grooves on the inner wall of this ring corresponding to the protrusions. This not only secures the filter device 5 well but also ensures that the filter device 5 will not move or rotate during motor operation.

[0042] The filter device 5 is a filter made of stainless steel mesh, glass fiber, or polyurethane. The filter intercepts the atomized cooling oil in the high-temperature oil-gas mixture that finally reaches the vicinity of the central hole 1, agglomerates it into oil droplets, and throws them out under centrifugal force, thus ensuring that the gas passing through the vent valve does not contain cooling oil.

[0043] Thus, the oil-gas separation device of the present invention has multiple separation settings for the cooling oil and oil-gas mixture in the motor, including an oil baffle ring 4, an oil-gas separator 3 and a filter device 5. This device can fully separate the gaseous oil-gas mixture generated at high temperature during motor operation, ensuring that the gas diffused to the vent valve does not contain cooling oil.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes and modifications made within the scope of the claims of this invention should be considered within the technical scope of this invention.

Claims

1. An oil-gas separation device for an oil-cooled motor, comprising an end cap (2) having a central hole (1), and an air vent mounting hole (6) and an oil injection hole (7) on the outer wall (11) of the central hole. Its features are: An oil baffle ring (4) is provided inside the end cap (2), and an oil-gas separator (3) is provided between the outer wall (11) of the center hole and the oil baffle ring (4); the oil-gas separator (3) includes an upper cover plate (31), a lower cover plate (32), and a filter chip (33) provided between the upper cover plate (31) and the lower cover plate (32). During the operation of the motor, the oil-gas separator (3) rotates together with the end cover (2). During operation, most of the cooling oil carried by the motor rotation is blocked by the oil baffle ring (4). Only a small amount of cooling oil and the high-temperature oil-gas mixture generated during the operation of the motor enter the oil baffle ring (4) and then enter the oil-gas separator (3). The oil droplets condensed in the cooling oil and the high-temperature oil-gas mixture will adhere to the filter chip (33) and be thrown out by centrifugal force.

2. The oil-gas separation device for an oil-cooled motor according to claim 1, characterized in that: The upper cover plate (31) of the oil-gas separator (3) is a circular plate with a central through hole (311) that is connected to the central hole (1); the lower cover plate (32) is annular, and its inner radius is larger than the radius of the central hole (1); the filter chip (33) is annular, and its outer radius is smaller than the outer radius of the lower cover plate (32), and its inner radius is larger than the inner radius of the lower cover plate (32); multiple filter chips (33) are arranged alternately between the upper cover plate (31) and the lower cover plate (32).

3. The oil-gas separation device for an oil-cooled motor according to claim 2, characterized in that: The filter chip (33) has a wavy ring structure.

4. The oil-gas separation device for an oil-cooled motor according to claim 2, characterized in that: A filter screen outer support (34) is provided between the upper cover plate (31) and the lower cover plate (32) at the outer edge of the filter chip (33), and a filter screen inner support (35) is provided between the upper cover plate (31) and the lower cover plate (32) at the inner edge of the filter chip (33).

5. The oil-gas separation device for an oil-cooled motor according to claim 1, characterized in that: The angle between the inner wall (41) of the oil baffle ring and the bottom of the end cap (2) is greater than 90 degrees.

6. The oil-gas separation device for an oil-cooled motor according to claim 2, characterized in that: A filter device (5) is installed between the outer wall (11) of the central hole and the inner ring of the lower cover plate (32) of the oil-gas separator (3).

7. The oil-gas separation device for an oil-cooled motor according to claim 2, characterized in that: The outer wall (11) of the central hole has a protrusion formed by the vent valve mounting hole (6) and the oil injection hole (7). The filter device (5) is annular, and the inner wall of the annular shape has a groove corresponding to the protrusion.

8. The oil-gas separation device for an oil-cooled motor according to claim 7, characterized in that: The filter device (5) is a filter screen made of stainless steel mesh, glass fiber, or polyurethane.

9. The oil-gas separation device for an oil-cooled motor according to claim 2, characterized in that: The outer wall (11) of the center hole is provided with an installation hole (12), and the upper cover plate (31) is provided with a corresponding fixing hole (312). The oil-gas separator (3) is fixed inside the end cover (2) through the fixing hole (312) and the installation hole (12).

10. The oil-gas separation device for an oil-cooled motor according to claim 1, characterized in that: The height of the oil baffle ring (4) is higher than the height of the oil-gas separator (3).

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