Liquid-cooled electric machine rotor
By installing oil supply and return sealing mechanisms in the rotor of the liquid-cooled motor, the problem of coolant leakage during rotor shaft rotation is solved, thereby improving the cooling effect and enabling the recycling of coolant.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAIZHOU TIANRUI ELECTRICAL APPLIANCES CO LTD
- Filing Date
- 2025-04-16
- Publication Date
- 2026-07-21
AI Technical Summary
In existing technologies, coolant leaks when the rotor shaft rotates, resulting in reduced cooling efficiency.
A liquid-cooled motor rotor was designed, employing an oil supply sealing mechanism and an oil return sealing mechanism to perform rotary sealing at the connection between the oil supply pipeline and the annular oil return pipeline, respectively, to ensure that the coolant does not leak.
It effectively prevents coolant leakage, maintains cooling effect, ensures that the internal temperature of the motor is within a reasonable range, and realizes the recycling of coolant.
Smart Images
Figure CN224537973U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor cooling and heat dissipation technology, and in particular to a liquid-cooled motor rotor. Background Technology
[0002] In the prior art, such as the utility model disclosed in Chinese Patent Website with Publication No. CN217508444U, a stator and rotor liquid cooling device for an electric motor is provided. Through a large circulation loop of coolant in the inner hole of the shaft, the first water channel, the stator water tank, and the second water channel, the shaft and the motor housing are filled with coolant. With the help of heat dissipation adhesive, the heat of the stator winding inside the motor is transferred to the motor housing. All the heat generated by the copper loss of the stator winding, the iron loss of the stator and rotor, and the mechanical loss of the bearings can be carried away by the coolant, so that the temperature of the entire motor is kept within an optimal range. The structure is simple, the use is simple, and the heat dissipation effect is effectively improved.
[0003] However, in actual use, the rotor will drive the rotor shaft to rotate together. The stator and rotor liquid cooling device of the motor has a shaft inner hole set in the rotor shaft as a coolant delivery pipe. The sealing of the interface between the rotor shaft and the liquid delivery pipe is not taken into account when the rotor shaft rotates. As the rotor shaft rotates, the coolant will leak, resulting in a reduction in the cooling effect. Summary of the Invention
[0004] Based on the existing technical problem that coolant leakage during rotor shaft rotation leads to reduced cooling effect, this utility model proposes a liquid-cooled motor rotor.
[0005] This utility model discloses a liquid-cooled motor rotor, including a housing, a stator fixedly connected to the inner arc sidewall of the housing, a rotor shaft rotatably connected to the middle of the housing via ball bearings, a rotor core fixedly connected to the arc surface of the rotor shaft, an oil supply pipe at one end of the rotor shaft, an annular oil return pipe at one end of the rotor shaft, an oil supply sealing mechanism at one end of the rotor shaft, and an oil return sealing mechanism at one end of the rotor shaft.
[0006] The oil delivery sealing mechanism performs a rotary sealing action at the connection of the oil delivery pipeline.
[0007] The oil return sealing mechanism performs a rotary sealing action at the connection of the annular oil return pipeline.
[0008] Preferably, the oil supply sealing mechanism includes a first sealing compression ring, which is fixedly installed at one end of the rotor shaft. First sealing blocks are fixedly installed on both sides of the first sealing compression ring. A first sealing shell is rotatably connected to the outer surface of the first sealing compression ring. A first sealing groove is formed on one inner wall of the first sealing shell. The inner side wall of the first sealing groove is slidably inserted into the outer surface of the first sealing block. A first O-ring is fixedly installed on the inner wall of the first sealing groove. The outer surface of the first O-ring is in extrusion contact with one side surface of the first sealing block.
[0009] Preferably, the inner wall of the first sealing shell is threaded with a sealing extrusion block, the sealing extrusion block has a rotating groove inside, the inner wall of the rotating groove is rotatably connected to the arc surface of one end of the rotor shaft, one end of the sealing extrusion block has a second sealing groove, the inner wall of the second sealing groove is slidably inserted into the outer surface of the first sealing block, and a second O-ring is fixedly installed on the inner wall of the second sealing groove, the outer surface of the second O-ring is in extrusion contact with one side surface of the first sealing block.
[0010] Preferably, the oil return sealing mechanism includes a second sealing compression ring, which is fixedly installed on the arc surface of one end of the rotor shaft. A second sealing block is fixedly installed on one side of the second sealing compression ring. The arc surfaces of the two second sealing compression rings are rotatably connected to a second sealing shell. A third sealing groove is formed on the inner wall of the second sealing shell. A third O-ring is fixedly installed on the inner wall of the third sealing groove. The outer surface of the second sealing block is slidably inserted into the inner wall of the third sealing groove. One side of the second sealing block is pressed into contact with the outer surface of the third O-ring.
[0011] Preferably, the rotor shaft has an oil supply hole inside, the upper end of the oil supply hole penetrates and extends into the housing, and the lower end of the oil supply hole penetrates and extends into the oil supply pipe. The rotor shaft also has an oil return hole inside, the upper part of the oil return hole penetrates and extends into the housing, and the lower end of the oil return hole penetrates and extends into the annular oil return pipe.
[0012] Preferably, one end of the sealing extrusion block is fixedly connected to an oil supply pipe, one end of the oil supply pipe is fixedly connected to an oil pump, the lower part of the oil pump is fixedly connected to an oil tank, the oil inlet of the oil pump passes through and extends into the interior of the oil tank, a cooling box is fixedly installed on one side of the oil tank, the oil outlet of the cooling box passes through and extends into the interior of the oil tank, the oil inlet of the cooling box is fixedly connected to a return oil pipe, one end of the return oil pipe passes through and extends into the interior of the second sealing shell.
[0013] The beneficial effects of this utility model are as follows:
[0014] By setting up oil supply pipelines and annular return oil pipelines, cooling oil is transported into the machine casing through the oil supply pipelines to dissipate heat and cool the stator and rotor. After absorbing heat, the cooling oil is transported out through the annular return oil pipelines, ensuring that there is always low-temperature cooling oil inside the machine casing for heat absorption. The oil supply sealing mechanism achieves a rotary seal at the connection of the oil supply pipeline, and the return oil sealing mechanism achieves a rotary seal at the connection of the annular return oil pipeline. This solves the existing technical problem of coolant leakage during rotor shaft rotation, which leads to a reduction in cooling effect. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of a liquid-cooled motor rotor proposed in this utility model;
[0016] Figure 2 This is a perspective view of the stator structure of a liquid-cooled motor rotor proposed in this utility model;
[0017] Figure 3 This is a cross-sectional view of the rotor shaft of a liquid-cooled motor rotor according to the present invention.
[0018] Figure 4 This is an enlarged view of point A of a liquid-cooled motor rotor according to the present invention;
[0019] Figure 5 This is an enlarged view of section B of a liquid-cooled motor rotor proposed in this utility model;
[0020] Figure 6 This is a perspective view of the first sealed outer shell structure of a liquid-cooled motor rotor proposed in this utility model;
[0021] Figure 7 This is a perspective view of the second sealing shell structure of a liquid-cooled motor rotor proposed in this utility model.
[0022] In the diagram: 1. Housing; 2. Stator; 3. Rotor shaft; 4. Rotor core; 5. Oil supply pipe; 6. Annular return oil pipe; 7. First sealing squeeze ring; 8. First sealing block; 9. First sealing shell; 10. First sealing groove; 11. First O-ring; 12. Sealing squeeze block; 13. Rotating groove; 14. Second sealing groove; 15. Second O-ring; 16. Second sealing squeeze ring; 17. Second sealing block; 18. Second sealing shell; 19. Third sealing groove; 20. Third O-ring; 21. Oil supply hole; 22. Return oil hole; 23. Oil supply pipe; 24. Oil pump; 25. Oil tank; 26. Cooling tank; 27. Return oil pipe. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0024] Reference Figures 1-7 A liquid-cooled motor rotor includes a housing 1, a stator 2 fixedly connected to the inner arc sidewall of the housing 1, a rotor shaft 3 rotatably connected to the middle of the housing 1 via ball bearings, a rotor core 4 fixedly connected to the arc surface of the rotor shaft 3, an oil supply pipe 5 and an annular oil return pipe 6 at one end of the rotor shaft 3, an oil supply sealing mechanism at one end of the rotor shaft 3, and an oil return sealing mechanism at one end of the rotor shaft 3.
[0025] The oil sealing mechanism performs a rotary sealing action at the connection of the oil pipeline 5.
[0026] The oil supply sealing mechanism includes a first sealing compression ring 7, which is fixedly installed at one end of the rotor shaft 3. First sealing blocks 8 are fixedly installed on both sides of the first sealing compression ring 7. A first sealing housing 9 is rotatably connected to the outer surface of the first sealing compression ring 7. A first sealing groove 10 is formed on one inner wall of the first sealing housing 9, and the inner wall of the first sealing groove 10 is slidably inserted into the outer surface of the first sealing block 8. A first O-ring 11 is fixedly installed on the inner wall of the first sealing groove 10, and the outer surface of the first O-ring 11 is connected to the first sealing block 8. The first sealing housing 9 has a sealing extrusion block 12 threadedly connected to the inner wall of the first sealing housing 9. The sealing extrusion block 12 has a rotating groove 13 inside. The inner wall of the rotating groove 13 is rotatably connected to the arc surface of one end of the rotor shaft 3. The sealing extrusion block 12 has a second sealing groove 14 at one end. The inner wall of the second sealing groove 14 is slidably inserted into the outer surface of the first sealing block 8. The inner wall of the second sealing groove 14 is fixedly installed with a second O-ring 15. The outer surface of the second O-ring 15 is in extrusion contact with one side surface of the first sealing block 8.
[0027] When the sealing compression block 12 is inserted into the first sealing shell through the thread, the first sealing block 8 is inserted into the first sealing groove 10 on the first sealing shell, compressing the first O-ring 11 to perform a preliminary seal. At the same time, the first sealing block 8 is inserted into the second sealing groove 14, causing the first sealing block 8 on the other side to compress the second O-ring 15 to perform a seal, forming a double seal.
[0028] The return oil sealing mechanism performs a rotary sealing action on the connection of the annular return oil pipeline 6.
[0029] The oil return sealing mechanism includes a second sealing compression ring 16, which is fixedly installed on the arc surface of one end of the rotor shaft 3. A second sealing block 17 is fixedly installed on one side of the second sealing compression ring 16. The arc surfaces of the two second sealing compression rings 16 are rotatably connected to a second sealing housing 18. A third sealing groove 19 is opened on the inner side wall of the second sealing housing 18. A third O-ring 20 is fixedly installed on the inner wall of the third sealing groove 19. The outer surface of the second sealing block 17 is slidably inserted into the inner side wall of the third sealing groove 19, and one side of the second sealing block 17 is pressed into contact with the outer surface of the third O-ring 20.
[0030] The second sealing block 17 is inserted into the third sealing groove 19 and presses against the third O-ring 20 to seal the cooling oil and prevent leakage. The first O-ring 11, the second O-ring 15, and the third O-ring 20 are made of nitrile rubber, which is resistant to petroleum-based oils, fuels, and lubricating oils, and offers high cost-effectiveness. It also has good wear resistance and resistance to compression set.
[0031] The rotor shaft 3 has an oil supply hole 21 inside. The upper end of the oil supply hole 21 extends into the housing 1, and the lower end of the oil supply hole 21 extends into the oil supply pipe 5. The rotor shaft 3 has an oil return hole 22 inside. The upper part of the oil return hole 22 extends into the housing 1, and the lower end of the oil return hole 22 extends into the annular oil return pipe 6.
[0032] Cooling oil is transported from oil outlet 21 through oil pipeline 5 to cool the stator 2 and rotor inside the housing 1. After absorbing the heat, the cooling oil is transported out through oil outlet and annular return oil pipeline 6, so that there is always low-temperature cooling oil inside the housing 1 to absorb heat.
[0033] One end of the sealing extrusion block 12 is fixedly connected to an oil supply pipe 23, and one end of the oil supply pipe 23 is fixedly connected to an oil pump 24. The lower part of the oil pump 24 is fixedly connected to an oil tank 25. The oil inlet end of the oil pump 24 passes through and extends into the interior of the oil tank 25. A cooling box 26 is fixedly installed on one side of the oil tank 25. The oil outlet end of the cooling box 26 passes through and extends into the interior of the oil tank 25. The oil inlet end of the cooling box 26 is fixedly connected to a return oil pipe 27. One end of the return oil pipe 27 passes through and extends into the interior of the second sealing shell 18.
[0034] An oil pump 24 is installed to pump the cooling oil in the oil tank 25 into the oil pipe 5 in the rotor shaft 3 via the oil pipe 23. The cooling oil is then transported into the housing 1 through the oil outlet 21. After absorbing heat, the cooling oil enters the annular oil outlet pipe from the oil outlet and is transported to the cooling box 26 through the return oil pipe 27. After absorbing heat, the cooling oil is cooled and then transported back into the oil tank 25 for recycling.
[0035] Working principle: When the sealing compression block 12 is threaded into the first sealing shell, the first sealing block 8 is inserted into the first sealing groove 10 on the first sealing shell, compressing the first O-ring 11 for initial sealing. Simultaneously, the first sealing block 8 is inserted into the second sealing groove 14, causing the other side of the first sealing block 8 to compress the second O-ring 15 for sealing, forming a double rotary seal in the oil pipeline 5. The second sealing block 17 is inserted into the third sealing groove 19 and presses against the third O-ring 20, sealing the cooling oil and preventing cooling. Oil leaks through the third sealing groove 19 and rotates to seal the annular return oil pipe 6. The oil pump 24 is started, and the cooling oil in the oil tank 25 is pumped through the oil pipe 23 into the oil pipe 5 in the rotor shaft 3. The cooling oil is then transported into the housing 1 through the oil outlet 21. The cooling oil that has absorbed heat enters the annular outlet pipe from the oil outlet and is transported to the cooling box 26 through the return oil pipe 27. The cooling oil that has absorbed heat is cooled and then transported back into the oil tank 25 for recycling.
[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A liquid-cooled motor rotor, comprising a housing (1), characterized in that: A stator (2) is fixedly connected to the inner arc sidewall of the housing (1). A rotor shaft (3) is rotatably connected to the middle of the housing (1) via a ball bearing. A rotor core (4) is fixedly connected to the arc surface of the rotor shaft (3). An oil supply pipe (5) is provided at one end of the rotor shaft (3). An annular oil return pipe (6) is provided at one end of the rotor shaft (3). An oil supply sealing mechanism is provided at one end of the rotor shaft (3). An oil return sealing mechanism is provided at one end of the rotor shaft (3). The oil delivery sealing mechanism performs a rotary sealing action at the connection of the oil delivery pipeline (5); The oil return sealing mechanism performs a rotary sealing action at the connection of the annular oil return pipe (6).
2. The liquid-cooled motor rotor according to claim 1, characterized in that: The oil supply sealing mechanism includes a first sealing compression ring (7), which is fixedly installed at one end of the rotor shaft (3). A first sealing block (8) is fixedly installed on both sides of the first sealing compression ring (7). A first sealing shell (9) is rotatably connected to the outer surface of the first sealing compression ring (7). A first sealing groove (10) is opened on one side of the inner wall of the first sealing shell (9). The inner side wall of the first sealing groove (10) is slidably inserted into the outer surface of the first sealing block (8). A first O-ring (11) is fixedly installed on the inner wall of the first sealing groove (10). The outer surface of the first O-ring (11) is pressed against one side surface of the first sealing block (8).
3. A liquid-cooled motor rotor according to claim 2, characterized in that: The inner wall of the first sealing shell (9) is threaded with a sealing extrusion block (12). The sealing extrusion block (12) has a rotating groove (13) inside. The inner wall of the rotating groove (13) is rotatably connected to the arc surface of one end of the rotor shaft (3). The sealing extrusion block (12) has a second sealing groove (14) at one end. The inner wall of the second sealing groove (14) is slidably inserted into the outer surface of the first sealing block (8). The inner wall of the second sealing groove (14) is fixedly installed with a second O-ring (15). The outer surface of the second O-ring (15) is pressed against one side surface of the first sealing block (8).
4. A liquid-cooled motor rotor according to claim 3, characterized in that: The oil return sealing mechanism includes a second sealing squeeze ring (16), which is fixedly installed on the arc surface of one end of the rotor shaft (3). A second sealing block (17) is fixedly installed on one side of the second sealing squeeze ring (16). The arc surfaces of the two second sealing squeeze rings (16) are rotatably connected to a second sealing shell (18). A third sealing groove (19) is opened on the inner wall of the second sealing shell (18). A third O-ring (20) is fixedly installed on the inner wall of the third sealing groove (19). The outer surface of the second sealing block (17) is slidably inserted into the inner wall of the third sealing groove (19). One side of the second sealing block (17) is pressed into contact with the outer surface of the third O-ring (20).
5. A liquid-cooled motor rotor according to claim 4, characterized in that: The rotor shaft (3) has an oil supply hole (21) inside. The upper end of the oil supply hole (21) penetrates and extends into the housing (1), and the lower end of the oil supply hole (21) penetrates and extends into the oil supply pipe (5). The rotor shaft (3) has a return oil hole (22) inside. The upper part of the return oil hole (22) penetrates and extends into the housing (1), and the lower end of the return oil hole (22) penetrates and extends into the annular return oil pipe (6).
6. A liquid-cooled motor rotor according to claim 5, characterized in that: One end of the sealing compression block (12) is fixedly connected to an oil pipe (23), and one end of the oil pipe (23) is fixedly connected to an oil pump (24). The lower part of the oil pump (24) is fixedly connected to an oil tank (25). The oil inlet end of the oil pump (24) penetrates and extends into the interior of the oil tank (25). A cooling box (26) is fixedly installed on one side of the oil tank (25). The oil outlet end of the cooling box (26) penetrates and extends into the interior of the oil tank (25). The oil inlet end of the cooling box (26) is fixedly connected to a return oil pipe (27). One end of the return oil pipe (27) penetrates and extends into the interior of the second sealing shell (18).