Liquid blocking labyrinth device of liquid cooling motor

Abstract

The invention relates to a liquid-blocking labyrinth device of a liquid-cooled motor. The liquid-blocking labyrinth device comprises an end cover provided with a central hole, and a liquid injection hole and a ventilation valve mounting hole which are arranged around the central hole, a plurality of spiral ribs diverging from inside to outside are arranged around the center hole at intervals, a liquid drainage groove is formed between every two adjacent spiral ribs, and each liquid drainage groove comprises a liquid drainage groove inner opening pointing to the center hole and a liquid drainage groove outer opening pointing to the outer side; a plurality of liquid blocking plates are arranged outside the tail ends of the spiral ribs at intervals, and gaps between the adjacent liquid blocking plates form outer air exchange ports; and a plurality of liquid-gas separation channels are formed by covering a liquid drainage groove formed by the liquid blocking plate and the spiral ribs with the liquid blocking cover plate. By arranging the multiple spiral liquid drainage grooves, the effect of fully separating gaseous cooling liquid and air mixtures generated at high temperature during operation of the motor is achieved, 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 a liquid-blocking labyrinth device for a liquid-cooled motor. Background Art

[0002] During the operation of a 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 a 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 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 to exchange gases 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 current liquid-cooled motors.

[0004] Chinese Invention Application CN117639352A discloses a liquid-blocking labyrinth structure for a liquid-cooled motor, 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 permeation channel is provided inside the liquid-blocking labyrinth member. A first air permeation port and a second air permeation port communicating with the air permeation channel are provided on the liquid-blocking labyrinth member. A main liquid-blocking plate is provided at each air permeation port; it is also included that an air valve mounting hole for mounting an air valve is provided on the liquid-blocking labyrinth member and / or the mounting plate, and the gas entering the air permeation channel from the air permeation port can be discharged through the air valve mounted on the air valve mounting hole.

[0005] In the above labyrinth structure, the main liquid-blocking plate tries to block the coolant outside the air permeation port; however, there is still some coolant that will enter the air permeation channel through the air permeation 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 permeation port, minimizing the possibility of the coolant contacting the air valve. The air 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 breather channel of the above maze structure has only one circle, 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 breather membrane, damaging the permeability of the breather 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 a liquid-blocking maze device for a liquid-cooled motor, which can achieve the effect of fully separating the gaseous coolant and air mixture generated by the high temperature during the operation of the motor by setting a spiral variable-diameter liquid-gas separation ring groove, and solves the problem that the coolant 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 as follows: A liquid-blocking maze device for a liquid-cooled motor includes an end cover provided with a central hole, and a liquid injection hole and a breather valve installation hole are arranged around the central hole; A plurality of spiral rib strips diverging from the inside to the outside are arranged at intervals around the central hole. A liquid discharge groove is formed between adjacent spiral rib strips. The liquid discharge groove includes a liquid discharge groove inner opening pointing to the central hole and a liquid discharge groove outer opening pointing to the outside; A plurality of liquid-blocking plates are arranged at intervals outside the ends of the spiral rib strips. An outer air exchange port is formed between adjacent liquid-blocking plates; a liquid-blocking cover plate is also provided, and the liquid-blocking cover plate covers the liquid discharge groove formed by the liquid-blocking plates and the spiral rib strips to form a plurality of liquid-gas separation channels.

[0009] The spiral direction of the spiral rib strips is opposite to the rotation direction of the motor.

[0010] The caliber of the liquid discharge groove gradually becomes larger from the inside to the outside. The caliber of the liquid discharge groove outer opening is larger than that of the liquid discharge groove inner opening, and the direction of the liquid discharge groove outer opening is opposite to the rotation direction of the motor.

[0011] A filtering device is arranged between the central hole and the inner liquid-blocking ring; the central hole has an outer wall of the central hole, an inner liquid-blocking ring is arranged around the outer wall of the central hole, and the spiral rib strips are connected to the inner liquid-blocking ring at intervals.

[0012] An inner air exchange port is arranged on the inner liquid-blocking ring, and the inner air exchange port is a depression on the inner liquid-blocking ring.

[0013] The height of the inner liquid-blocking ring is the same as that of the spiral rib strips. The inner air exchange port is arranged at the liquid discharge groove inner opening, and one inner air exchange port is arranged at each liquid discharge groove inner opening.

[0014] The liquid-blocking plate is arc-shaped and is arranged outside the ends of the spiral rib strips and between the outer openings of two adjacent drainage grooves. One liquid-blocking plate is arranged between the outer openings of every two adjacent drainage grooves.

[0015] An outer liquid-blocking ring is arranged on the outside of the liquid-blocking plate, and there is a gap between the outer liquid-blocking ring and the liquid-gas separation channel.

[0016] The height of the outer liquid-blocking ring is higher than that of the spiral rib strips.

[0017] There are protrusions formed by liquid injection holes and air vent valve installation holes on the outer wall of the central hole. The filtering device is annular, and the inner wall of the annulus is provided with grooves corresponding to the protrusions.

[0018] The advantages of the present invention are as follows: 1. Multiple drainage grooves are formed by multiple spiral rib strips around the central hole. The spiral winding direction of the spiral rib strips is opposite to the rotation direction of the motor, and the centrifugal force can be utilized most efficiently to throw out the coolant entering the drainage grooves; 2. The number of drainage grooves arranged around the central hole can be reasonably set according to the size of the end cover, which is simple and easy to implement; 3. Liquid-blocking plates are arranged at the outer openings of two adjacent drainage grooves, which can block the coolant from entering the drainage grooves to the greatest extent, and also form an outer air exchange port and a centrifugal discharge port for the coolant, with a clever design; 4. The design of the outer liquid-blocking ring reduces the amount of coolant entering the drainage grooves. Coupled with the inner liquid-blocking ring around the central hole, the probability of the coolant reaching the air vent valve is extremely small; 5. A filtering device is arranged in the space between the central hole and the inner liquid-blocking ring, which can further retain the coolant condensed during the operation of the liquid-gas mixture and then throw it out from the inner air exchange port through centrifugal force, further improving the liquid-gas separation effect and ensuring that the coolant will not enter the position where the air vent valve is located; 6. The width of the drainage groove gradually becomes wider from the inside to the outside, making it more convenient for the coolant to be thrown out of the liquid-gas separation ring groove under the action of centrifugal force; 7. Six settings such as the liquid-blocking cover plate 8, the outer liquid-blocking ring 9, the liquid-blocking plate 6, the drainage groove 5, the inner liquid-blocking ring 3, and the filtering device 12 ensure that the liquid-gas mixture can be fully separated. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the labyrinth structure in the present invention.

[0020] Figure 2 It is an exploded view of the structure of the present invention.

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

[0022] In the figure: 1 - central hole; 2 - end cover; 3 - inner liquid-blocking ring; 4 - spiral rib strip; 5 - drainage groove; 51 - outer opening of the drainage groove; 52 - inner opening of the drainage groove; 6 - liquid-blocking plate; 71 - outer air exchange port; 72 - inner air exchange port; 8 - liquid-blocking cover plate; 9 - outer liquid-blocking ring; 10 - liquid injection hole; 11 - outer wall of the central hole; 12 - filtering device; 13 - air vent valve installation hole. Detailed Implementation Manner

[0023] 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.

[0024] 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 accompanying drawings or description. Additionally, for the convenience of expression, some components in the accompanying drawings will be omitted, enlarged, or reduced, but this does not represent the size or entire structure of the actual product.

[0025] A liquid-blocking labyrinth device for a liquid-cooled motor of the present invention, as Figures 1-3 shown, includes an end cover 2 provided with a central hole 1. The central hole 1 has a central hole outer wall 11, and a liquid injection hole 10 and a breather valve mounting hole 13 are provided around the central hole 1.

[0026] As Figure 1 shown, a plurality of spiral rib strips 4 diverging from the inside to the outside are arranged at intervals around the central hole 1. A drainage groove 5 is formed between adjacent spiral rib strips 4. The drainage groove 5 includes a drainage groove inner opening 52 pointing to the central hole 1 and a drainage groove outer opening 51 pointing to the outside. A plurality of liquid-blocking plates 6 are arranged at intervals outside the ends of the spiral rib strips 4. A gap between adjacent liquid-blocking plates 6 forms an outer air exchange port 71. As Figure 2 shown, a liquid-blocking cover plate 8 is further provided. The liquid-blocking cover plate 8 covers the drainage groove 5 formed by the liquid-blocking plates 6 and the spiral rib strips 4 to form a plurality of liquid-gas separation channels. Among them, the liquid-blocking cover plate 8 forming the liquid-gas separation channels can be fixed together with the liquid-blocking plates 6 and the drainage groove 5 by means such as bolts, riveting, or even welding, or can be integrally formed.

[0027] The spiral direction of the spiral rib strips 4 is opposite to the rotation direction of the motor. Moreover, the diameter of the drainage groove 5 gradually increases from the inside to the outside. The diameter of the drainage groove outer opening 51 is larger than the diameter of the drainage groove inner opening 52, and the direction of the drainage groove outer opening 51 is opposite to the rotation direction of the motor.

[0028] The liquid-gas separation channel is a place for separating the gaseous liquid-gas mixture generated by the high temperature during the operation of the motor. The liquid-gas mixture diffuses from the outer air exchange port 71 to the inner air exchange port 72 and finally exchanges at the breather valve to achieve pressure balance inside and outside the motor. At the same time, the coolant in the motor and the liquefied coolant in the liquid-gas mixture will both enter the drainage groove 5. Because the spiral direction of the spiral rib strips 4 is opposite to the rotation direction of the motor, the entering coolant will be thrown out under the action of centrifugal force during the rotation of the motor. In order to achieve a better liquid-gas separation effect in a narrow motor space, as many drainage grooves 5 as possible can be set within the range allowed by the end cover 2, so as to finally achieve that the gas reaching the breather valve contains no or very little coolant, achieving the purpose of extending the service life of the breather valve.

[0029] Preferably, the liquid blocking plate 6 is arc-shaped and is arranged outside the end of the spiral rib 4 and between the outer openings 51 of two adjacent drainage grooves. One liquid blocking plate 6 is arranged between every two adjacent outer openings 51 of the drainage grooves. The liquid blocking plate 6 can play a role in blocking the coolant from entering at the outer opening 51 of the drainage groove, and the gap between adjacent liquid blocking plates 6 forms an outer air exchange port 71, which does not prevent the exchange of gas. At the same time, the outer air exchange port 71 is also the outlet where the coolant entering the drainage groove 5 is thrown out by centrifugal force when the motor rotates. This is also the reason why the liquid blocking plate 6 is arranged between the outer openings 51 of two adjacent drainage grooves.

[0030] Furthermore, to ensure that the gas diffused to the air permeable valve does not contain coolant, an inner liquid blocking ring 3 is arranged around the outer wall 11 of the central hole, and the inner end of the spiral rib 4 is connected to the inner liquid blocking ring 3 at an interval. As Figure 1 、 Figure 2 shown, the inner air exchange port 72 is arranged on the inner liquid blocking ring 3, and the inner air exchange port 72 is a depression on the inner liquid blocking ring 3. Preferably, the depression is preferably a notch that does not reach the bottom of the inner liquid blocking ring 3, so that a part of the inner liquid blocking ring 3 still remains to block the coolant that has not been completely discharged.

[0031] The inner air exchange port 72 is arranged at the inner opening 52 of the drainage groove, and one inner air exchange port 72 is arranged at each inner opening 52 of the drainage groove. The height of the inner liquid blocking ring 3 is the same as that of the spiral rib 4. In this way, when the liquid blocking cover plate 8 covers the drainage groove 5, the liquid blocking plate 6 and the inner liquid blocking ring 3, a closed space is formed, ensuring that the liquid-gas mixture can only diffuse to the air permeable valve through the outer air exchange port 71, the drainage groove 5 and the inner air exchange port 72.

[0032] To further reduce the coolant entering the liquid-gas separation channel, an outer liquid blocking ring 9 is arranged outside the liquid blocking plate 6, and there is a gap between the outer liquid blocking ring 9 and the liquid-gas separation channel. The height of the outer liquid blocking ring 9 is higher than that of the spiral rib 4. In this way, the outer liquid blocking ring 9 forms an isolation zone, and during the rotation of the motor, most of the coolant cannot enter the liquid-gas separation channel due to the outer liquid blocking ring 9.

[0033] As Figure 2 、 Figure 3 shown, to further ensure that the gas diffused to the air permeable valve does not contain coolant, a filtering device 12 is arranged between the central hole 1 and the inner liquid blocking ring 3; since there are protrusions formed by the liquid injection hole 10 and the air permeable valve installation hole 13 on the outer wall 1 of the central hole, the filtering device 12 is correspondingly arranged in a ring shape, and the inner wall of the ring shape is provided with grooves corresponding to the protrusions. In this way, not only can the filtering device 12 be well fixed, but also it is ensured that the filtering device 12 will not move or rotate during the operation of the motor.

[0034] The filtering device 12 can generally be selected as a filter screen made of stainless steel mesh, or glass fiber, or polyurethane.

[0035] The filter screen will intercept the atomized coolant in the high-temperature liquid-gas mixture that finally reaches near the central hole 1, polymerize it into droplets and throw them out under the action of centrifugal force, so as to ensure that the gas passing through the breather valve does not contain coolant.

[0036] In this way, the labyrinth liquid retaining device of the present invention is provided with a six-fold separation setting including a liquid retaining cover plate 8, an outer liquid retaining ring 9, a liquid blocking plate 6, a liquid discharge groove 5, an inner liquid retaining ring 3 and a filtering device 12 for the coolant and liquid-gas mixture in the motor. This device can fully separate the gaseous liquid-gas mixture generated by high temperature during the operation of the motor, and ensure that the gas diffused to the breather valve does not contain coolant.

[0037] 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 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. A liquid-blocking labyrinth device for a liquid-cooled motor, comprising an end cover (2) provided with a central hole (1), and liquid injection holes (10) and a breathable valve mounting hole (13) provided around the central hole (1); Features: A plurality of spiral ribs (4) are arranged at intervals around the central hole (1) and diverge from the inside to the outside, and a drainage groove (5) is formed between adjacent spiral ribs (4). The drainage groove (5) comprises an inner drainage groove opening (52) pointing toward the central hole (1) and an outer drainage groove opening (51) pointing outward; A plurality of liquid blocking plates (6) are arranged at intervals outside the ends of the spiral ribs (4), and gaps between adjacent liquid blocking plates (6) form an external air exchange port (71); a liquid blocking cover plate (8) is also provided, and the liquid blocking cover plate (8) covers the liquid blocking plates (6) and the liquid drainage grooves (5) formed by the spiral ribs (4) to form a plurality of liquid-gas separation channels.

2. The liquid-blocking labyrinth device for a liquid-cooled motor according to claim 1, characterized in that: The spiral direction of the spiral rib (4) is opposite to the rotation direction of the motor.

3. The liquid-blocking labyrinth device for a liquid-cooled motor according to claim 2, characterized in that: The diameter of the drainage groove (5) gradually widens from the inside to the outside, the diameter of the outer opening (51) of the drainage groove is larger than the diameter of the inner opening (52) of the drainage groove, and the direction of the outer opening (51) of the drainage groove is opposite to the rotation direction of the motor.

4. The liquid-blocking labyrinth device for a liquid-cooled motor according to claim 1, characterized in that: The central hole (1) has a central hole outer wall (11), an inner liquid retaining ring (3) is arranged around the central hole outer wall (11), and the spiral ribs (4) are spacedly connected to the inner liquid retaining ring (3).

5. The liquid-blocking labyrinth device for a liquid-cooled motor according to claim 4, characterized in that: An inner air exchange port (72) is provided on the inner liquid retaining ring (3), and the inner air exchange port (72) is a depression on the inner liquid retaining ring (3).

6. The liquid-blocking labyrinth device for a liquid-cooled motor according to claim 5, characterized in that: The height of the inner liquid retaining ring (3) is the same as that of the spiral ribs (4); the inner air exchange ports (72) are arranged at the openings (52) in the liquid drain grooves; and one inner air exchange port (72) is arranged at each opening (52) in the liquid drain grooves.

7. The liquid-blocking labyrinth device for a liquid-cooled motor according to claim 1, characterized in that: The liquid blocking plate (6) is arc-shaped and is arranged outside the end of the spiral rib (4) and between two adjacent outer openings (51) of the liquid drain grooves. One liquid blocking plate (6) is arranged between every two adjacent outer openings (51) of the liquid drain grooves.

8. The liquid-blocking labyrinth device for a liquid-cooled motor according to claim 1, characterized in that: An outer liquid blocking ring (9) is arranged outside the liquid blocking plate (6), and a gap is left between the outer liquid blocking ring (9) and the liquid-gas separation channel.

9. The liquid-blocking labyrinth device for a liquid-cooled motor according to claim 8, characterized in that: The height of the outer liquid retaining ring (9) is higher than the height of the spiral ribs (4).

10. The liquid-blocking labyrinth device for a liquid-cooled motor according to claim 4, characterized in that: A filter device (12) is arranged between the central hole (1) and the inner liquid retaining ring (3); a protrusion formed by the liquid injection hole (10) and the air valve mounting hole (13) is provided on the outer wall (11) of the central hole; the filter device (12) is annular, and a groove corresponding to the protrusion is provided on the inner wall of the annular shape.

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