Oil-gas separation device of oil-cooled motor

Abstract

The oil-gas separation device comprises an end cover provided with a center hole, and the outer wall of the center hole is provided with an oil injection hole and a ventilation valve mounting hole; an oil retainer is arranged in the end cover; an oil-gas separator is arranged between the outer wall of the central hole and the oil retainer; the oil-gas separator comprises an upper cover plate, a lower cover plate and a filter chip arranged between the upper cover plate and the lower cover plate. By arranging the oil-gas separator, the effect of fully separating gaseous cooling liquid and air mixture generated at high temperature during operation of the motor is achieved, the oil-gas separator is convenient to replace so as to prolong the service life of the motor, and the problem that in the prior art, 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 an oil-gas separation device for an oil-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 provided with a central hole thereon, and further including 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, and 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 the maze structure has only one circle of breathable channels, 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, 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 object of the present invention is to provide an oil-gas separation device for an oil-cooled motor, which can achieve the effect of fully separating the gaseous cooling oil and air mixture generated by the high temperature during the operation of the motor by setting an oil-gas separator, and solves the problem that the cooling oil in the prior art damages the air permeability of the breather valve.

[0008] To achieve the above object, the technical solution of the present invention is: An oil-gas separation device for an oil-cooled motor includes an end cover provided with a central hole, and an oil injection hole and a breather valve installation hole are provided on the outer wall of the central hole; An oil baffle ring is arranged inside the end cover, and an oil-gas separator is arranged 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 filter chips arranged between the upper cover plate and the lower cover plate.

[0009] The upper cover plate of the oil-gas separator is a circular plate provided with a central through hole, and the central through hole communicates with the central hole; the lower cover plate is in a circular ring shape, and the radius of its inner circle is greater than the radius of the central hole; the filter chips are in a circular ring shape, the radius of its outer circle is less than the outer circle radius of the lower cover plate, and the radius of its inner circle is greater than the inner circle radius of the lower cover plate; multiple filter chips are provided and are sequentially arranged at intervals between the upper cover plate and the lower cover plate.

[0010] The filter chip is a circular ring structure in a wavy shape.

[0011] A filter screen outer support is arranged between the upper cover plate and the lower cover plate and at the outer edge of the filter chip, and a filter screen inner support is arranged between the upper cover plate and the lower cover plate and at the inner edge of the filter chip.

[0012] The angle between the inner wall of the oil baffle ring and the bottom of the end cover is greater than 90 degrees.

[0013] A filtering device is arranged between the outer wall of the central hole and the inner circle of the lower cover plate of the oil-gas separator.

[0014] There are protrusions formed by the oil injection hole and the breather valve installation hole on the outer wall of the central hole. The filtering device is in a circular ring shape, and the inner wall of the circular ring is provided with grooves corresponding to the protrusions.

[0015] The filtering device is a filter screen made of stainless steel mesh or glass fiber or polyurethane.

[0016] An installation hole is provided on the outer wall of the central hole, and a fixing hole is correspondingly provided on the upper cover plate. The oil-gas separator is fixed in the end cover through the fixing hole and the installation hole.

[0017] The height of the oil baffle ring is higher than that of the oil-gas separator.

[0018] The advantages of the present invention are as follows: 1. The design of the oil baffle ring reduces the amount of cooling oil entering the oil-gas separator, and the included angle between the inner wall of the oil baffle ring and the end cover is an obtuse angle. When the motor stops rotating, due to gravity, the cooling oil drips outside the oil baffle ring through the inner wall of the oil baffle ring; 2. A filtering device is arranged 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 be thrown out by centrifugal force, further improving the oil-gas separation effect and ensuring that the cooling oil does not enter the position where the breather valve is located; 3. The filter chips in the oil-gas separator are wavy and are stacked at intervals of the filter sheets, increasing the attachment area of oil droplets; 4. Multiple settings such as the oil baffle ring, the oil-gas separator, the inner oil baffle ring, and the filtering device ensure that the oil-gas mixture can be fully separated; 5. It is convenient to assemble. Moreover, when there is too much oil stain, there is no need to clean it, and the oil-gas separator can be directly replaced. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the present invention.

[0020] Figure 2 is a sectional view of the structure of the present invention Figure 1 .

[0021] Figure 3 is a sectional view of the structure of the present invention Figure 2 .

[0022] Figure 4 is a schematic structural diagram of the oil-gas separator in the present invention.

[0023] Figure 5 is an exploded view of the structure of the oil-gas separator in the present invention.

[0024] Figure 6 is a sectional view of the structure of the oil-gas separator in the present invention.

[0025] In the figure: 1 - central hole; 11 - outer wall of the central hole; 12 - installation hole; 2 - end cover; 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 the filter screen; 35 - inner support of the filter screen; 4 - oil baffle ring; 41 - inner wall of the oil baffle ring; 5 - filtering device; 6 - breather valve installation hole; 7 - oil injection hole. Detailed Embodiments

[0026] The present invention will be further described below in conjunction with the accompanying drawings. The accompanying drawings are only for illustrative purposes and should not be construed as limiting the patent.

[0027] To describe this embodiment more concisely, 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 the description. Additionally, for ease 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.

[0028] An oil-gas separation device for an oil-cooled motor according to the present invention, as Figures 1-6 shown, includes an end cover 2 provided with a central hole 1, and an air vent valve mounting hole 6 and an oil injection hole 7 are provided on the outer wall 11 of the central hole.

[0029] As Figures 1-3 shown, an oil baffle ring 4 is arranged inside the end cover 2. The oil baffle ring 4 is a circular ring centered on the central hole 1. When the motor operates and drives the cooling oil, the oil baffle ring 4 blocks most of the cooling oil, preventing the cooling oil from entering the inside of the oil baffle ring 4 and thus contaminating the air vent valve.

[0030] Furthermore, as Figure 2 、 3 shown, the included 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 operating, the cooling oil that enters 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 4 to the outside of the oil baffle ring 4, rather than accumulating inside the oil baffle ring 4 and contaminating the air vent valve.

[0031] As Figures 1-3 shown, an oil-gas separator 3 is arranged 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 filter chips 33 arranged between the upper cover plate 31 and the lower cover plate 32.

[0032] As Figures 4-6 shown, the upper cover plate 31 of the oil-gas separator 3 is a circular plate provided with a central through hole 311, and the central through hole 311 communicates with the central hole 1; the lower cover plate 32 is in a circular ring shape, and the radius of its inner circle is greater than the radius of the central hole 1; the filter chips 33 are in a circular ring shape, the radius of its outer circle is less than the outer circle radius of the lower cover plate 32, and the radius of its inner circle is greater than the inner circle radius of the lower cover plate 32; multiple filter chips 33 are provided and are arranged at intervals in sequence between the upper cover plate 31 and the lower cover plate 32, and there is a gap between adjacent two.

[0033] A filter screen outer support 34 is arranged at the outer edge of the filter chips 33 between the upper cover plate 31 and the lower cover plate 32, and a filter screen inner support 35 is arranged at the inner edge of the filter chips 33 between the upper cover plate 31 and the lower cover plate 32. The filter chips 33 are fixed on the filter screen outer support 34 and the filter screen inner support 35, and the filter chips 33 maintain a gap when being fixed.

[0034] The filter chips 33 can be made into a wave-shaped circular ring structure, and the filter chips 33 can be stacked alternately, so that gaps can be formed between the filter chips 33. Moreover, the wave-shaped filter chips 33 also increase the attachment area of ​​the oil droplets.

[0035] Furthermore, the outer wall 11 of the center hole is provided with a mounting hole 12, and the upper cover plate 31 is correspondingly provided with a fixing hole 312. The oil-gas separator 3 can be fixed in the end cover 2 through the fixing hole 312 and the mounting hole 12 by means of screws or other fixing parts, and rotates with the end cover 2.

[0036] Similarly, the design of the oil-gas separator 3 is convenient for disassembly and replacement. When the motor is used for an extended period of time, the oil-gas separator 3 can be replaced to ensure the oil-gas separation effect.

[0037] During the operation of the motor, the oil-gas separator 3 rotates with the end cover 2. During the operation, most of the cooling oil brought up by the rotation of the motor is blocked by the oil retaining 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 retaining ring 4 and then enter the oil-gas separator 3. The condensed oil droplets 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. In addition, the filter chip 33 is made into a wavy ring structure, and its oil droplet adhesion area is greatly increased, so that more oil droplets are attached to the filter chip 33 and thrown out by centrifugal force, which greatly reduces the amount of oil droplets reaching the breathable valve.

[0038] In order to prevent more cooling oil from entering the vicinity of the central hole 1 , the height of the oil retaining ring 4 is higher than the height of the oil-gas separator 3 .

[0039] like Figures 1-3 As shown, in order to further ensure that the gas diffused to the breathable valve does not contain cooling oil, a filter device 5 is arranged between the outer wall 11 of the center hole and the inner circle of the lower cover plate 32 of the oil-gas separator 3. Since there is a protrusion formed by the oil injection hole 7 and the breathable valve mounting hole 6 on the outer wall 11 of the center hole, the filter device 5 is correspondingly arranged in an annular shape, and the inner wall of the annular shape is provided with a groove corresponding to the protrusion. This not only can well fix the filter device 5, but also ensure that the filter device 5 will not move or rotate when the motor is running.

[0040] The filter device 5 is a filter made of stainless steel mesh, glass fiber or polyurethane. The filter will intercept the atomized cooling oil in the high-temperature oil-gas mixture that finally reaches the vicinity of the central hole 1, aggregate it into oil droplets and throw it out under the action of centrifugal force, thereby ensuring that the gas passing through the breathable valve does not contain cooling oil.

[0041] In this way, for the cooling oil and oil-gas mixture in the motor, the oil-gas separation device of the present invention is provided with multiple separation settings including an oil baffle ring 4, an oil-gas separator 3, and a filtering device 5. This device can fully separate the gaseous oil-gas mixture generated by high temperature during the operation of the motor, ensuring that the gas diffused to the breather valve does not contain cooling oil.

[0042] In summary, the above are only the preferred embodiments of the present invention and are not intended 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 fall within the technical scope of the present invention.

Claims

1. An oil-gas separation device for an oil-cooled motor, comprising an end cover (2) provided with a central hole (1), an outer wall (11) of the central hole provided with a breathable valve mounting hole (6) and an oil injection hole (7); Features: An oil deflector ring (4) is arranged inside the end cover (2), and an oil-gas separator (3) is arranged between the outer wall (11) of the center hole and the oil deflector ring (4); the oil-gas separator (3) comprises an upper cover plate (31), a lower cover plate (32), and a filter chip (33) arranged between the upper cover plate (31) and the lower cover plate (32).

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 provided with a central through hole (311), wherein the central through hole (311) is connected to the center hole (1); the lower cover plate (32) is in the shape of a ring, and its inner circle radius is greater than the radius of the center hole (1); the filter chip (33) is in the shape of a ring, and its outer circle radius is smaller than the outer circle radius of the lower cover plate (32), and its inner circle radius is greater than the inner circle radius of the lower cover plate (32); a plurality of filter chips (33) are provided, and are sequentially spaced and arranged 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) is a wavy ring structure.

4. The oil-gas separation device for an oil-cooled motor according to claim 2, characterized in that: An outer filter support (34) is provided between the upper cover plate (31) and the lower cover plate (32) and at the outer edge of the filter core (33), and an inner filter support (35) is provided between the upper cover plate (31) and the lower cover plate (32) and at the inner edge of the filter core (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 retaining ring and the bottom of the end cover (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 filtering device (5) is provided between the outer wall (11) of the central hole and the inner circle 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 air-permeable valve mounting hole (6) and the oil injection hole (7); the filter device (5) is annular, and the inner wall of the annular shape is provided with 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 made of stainless steel mesh or 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 central hole is provided with a mounting hole (12), and the upper cover plate (31) is correspondingly provided with a fixing hole (312); the oil-gas separator (3) is fixed in the end cover (2) via the fixing hole (312) and the mounting 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 retaining ring (4) is higher than the height of the oil-gas separator (3).

Images