A shaft sleeve oil seal structure enhancing the heat dissipation effect of cooling liquid

Abstract

The application discloses a shaft sleeve oil seal structure capable of enhancing the heat dissipation effect of cooling liquid, and relates to the technical field of air compressors.The shaft sleeve oil seal structure comprises a shaft sleeve body, a motor output shaft and an oil seal, the shaft sleeve body is coaxially fixed on the motor output shaft, the oil seal is rotatably sleeved on the shaft sleeve body, an inner wall of the shaft sleeve body close to the motor output shaft is provided with a cooling groove for filling the cooling liquid, the cooling groove is located at one end of the shaft sleeve body close to a cooling liquid area and is in communication with the cooling liquid area, and the other end of the cooling groove away from the cooling liquid area extends to a friction position of the shaft sleeve body and the oil seal.The cooling groove directly guides the cooling liquid to the inner side of the shaft sleeve body at the friction position of the shaft sleeve body and the oil seal, so that the cooling liquid can absorb the heat generated by friction at a close distance, the heat dissipation efficiency is improved, the risk of damage of the oil seal due to high temperature is reduced, the service life of the oil seal is prolonged, and the equipment maintenance cost is reduced;and along with the rotation of the motor output shaft, the cooling liquid flows in and out of the cooling groove, and the heat dissipation efficiency is further improved.

Description

Technical Field

[0001] This application relates to the technical field of air compressors, and in particular to a bushing oil seal structure that enhances the heat dissipation effect of coolant. Background Technology

[0002] An air compressor is a device used to compress gas. In the structure of an air compressor, an oil seal is installed at the motor output shaft to prevent the lubricating oil inside the compressor from leaking into the motor and causing damage to the motor, thus ensuring the normal operation of the motor and the overall stability of the equipment.

[0003] In the prior art, a bushing is fitted on the motor output shaft, and an oil seal is fitted on the outside of the bushing. When the air compressor is working, the motor output shaft drives the bushing to rotate synchronously. At this time, the bushing and the oil seal generate a lot of heat due to relative friction. If this heat cannot be dissipated in time, the oil seal is easily damaged due to high temperature, which not only shortens the service life of the oil seal, but also increases the maintenance cost of the equipment and affects the continuous and stable operation of the air compressor. The lubricating oil also acts as a coolant to dissipate heat from the bushing and the oil seal. The lubricating oil forms a coolant zone on the side of the bushing and the oil seal away from the motor body.

[0004] In the aforementioned existing technologies, the coolant directly contacts the sidewall of the oil seal and the outer wall of one end of the bushing for heat exchange. When the motor rotates at high speed, the heat generated is very large, the cooling efficiency is insufficient, and the problem of oil seal damage due to high temperature cannot be solved. This not only shortens the service life of the oil seal, but also increases the maintenance cost of the equipment. Utility Model Content

[0005] To address the problem of poor heat dissipation of the oil seal bushing structure by the coolant, this application proposes a bushing oil seal structure that enhances the heat dissipation effect of the coolant.

[0006] This application provides a bushing oil seal structure that enhances the heat dissipation effect of coolant, employing the following technical solution:

[0007] A bushing oil seal structure for enhancing coolant heat dissipation includes a bushing body, a motor output shaft, and an oil seal. The bushing body is coaxially fixed on the motor output shaft, and the oil seal is rotatably sleeved on the bushing body. The inner wall of the bushing body has a cooling groove for filling coolant. The cooling groove is located at one end of the bushing body near the coolant area and communicates with the coolant area. The end of the cooling groove away from the coolant area extends to the friction position between the bushing body and the oil seal.

[0008] By adopting the above technical solution, the cooling tank directly guides the coolant to the inner side of the bushing body at the friction position between the bushing body and the oil seal, so that the coolant can absorb the heat generated by friction at close range, improve heat dissipation efficiency, reduce the risk of oil seal damage due to high temperature, extend the service life of the oil seal and reduce equipment maintenance costs; and as the motor output shaft rotates, the coolant will flow inside and outside the cooling tank, further improving heat dissipation efficiency.

[0009] Preferably, the friction point between the bushing body and the oil seal is located at the axial center of the cooling groove.

[0010] By adopting the above technical solution, the friction position is the core area where heat is generated when the bushing body and the oil seal move relative to each other. By setting it in the middle of the axial direction of the cooling tank, the heat can be absorbed by the coolant in the cooling tank with the highest efficiency, thereby further improving the heat dissipation efficiency of the coolant.

[0011] Preferably, the cooling groove is arranged in an annular groove around the circumference of the motor output shaft.

[0012] By adopting the above technical solution, the annular structure enables the cooling grooves to be evenly distributed along the circumference of the bushing, ensuring that the coolant fully covers and dissipates heat from the entire friction circumference of the bushing and the oil seal, avoiding high temperature problems caused by uneven cooling in local friction areas, and further improving the uniformity of heat dissipation.

[0013] Preferably, the wall thickness of the bushing body at the location of the cooling groove is 2-3 mm.

[0014] By adopting the above technical solution, the 2-3mm wall thickness ensures that the cooling tank has sufficient structural rigidity while ensuring heat dissipation efficiency, preventing deformation and cracking of the tank wall due to centrifugal force and frictional stress.

[0015] Preferably, the cooling tank wall is provided with a spiral groove, which extends from the end of the cooling tank away from the coolant area around the motor output shaft to the point where the cooling tank and the coolant area are connected, and the spiral groove is provided to be less than one turn around the motor output shaft.

[0016] By adopting the above technical solution, when the motor output shaft rotates clockwise or counterclockwise, the spiral groove rotates with the motor output shaft. The coolant is guided by the spiral groove and moves into the coolant area or cooling tank, which improves the fluidity of the coolant and allows the hot coolant to be replaced with cold coolant, thereby improving heat dissipation efficiency. The spiral groove is set to be less than one turn around the motor output shaft, which reduces the processing difficulty while ensuring good coolant flow.

[0017] Preferably, the spiral groove has multiple channels, and the spiral grooves are evenly arranged in a circular array along the circumference of the motor output shaft.

[0018] By adopting the above technical solution, the multiple spiral grooves work together to create a more complex and thorough turbulence in the coolant within the cooling tank, significantly improving the coolant's fluidity and heat exchange efficiency, avoiding uneven heat dissipation in local areas, and allowing the heat in the entire friction area to be carried away evenly and quickly.

[0019] Preferably, the spiral groove depth is 0.1-0.5 mm.

[0020] By adopting the above technical solution, a groove depth of 0.1-0.5mm increases the contact area between the coolant and the bushing body and promotes the flow of coolant while ensuring the structural strength of the groove wall. This ensures that the cooling effect is improved without affecting the overall stability of the bushing.

[0021] Preferably, a flow hole is provided at one end of the bushing body near the coolant zone, the axis of the flow hole is perpendicular to the axis of the motor output shaft, and the flow hole is provided through the wall of the cooling tank.

[0022] By adopting the above technical solution, when the air compressor is running, the coolant in the cooling tank will absorb heat and its temperature will rise, resulting in a decrease in cooling capacity. The flow hole accelerates the flow speed of the coolant in the cooling tank, ensuring that there is always a coolant with high cooling capacity in the cooling tank.

[0023] Preferably, there are multiple flow holes, which are evenly arranged in a circular array along the circumference of the bushing body, and all of the multiple flow holes penetrate the wall of the cooling tank.

[0024] By adopting the above technical solution, multiple flow holes can realize the entry and exit of coolant from multiple angles, significantly improving the flow speed and flow volume, making the coolant in the cooling tank refresh more quickly and evenly.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The cooling tank directly guides the coolant to the inner side of the bushing body at the friction position between the bushing body and the oil seal, allowing the coolant to absorb the heat generated by friction at close range, improving heat dissipation efficiency, reducing the risk of oil seal damage due to high temperature, extending the service life of the oil seal and reducing equipment maintenance costs; and as the motor output shaft rotates, the coolant will flow inside and outside the cooling tank, further improving heat dissipation efficiency.

[0027] 2. When the motor output shaft rotates clockwise or counterclockwise, the spiral groove rotates with the motor output shaft. The coolant is guided by the spiral groove and moves into the coolant zone or cooling tank, which improves the fluidity of the coolant and allows the hot coolant to be replaced with cold coolant, thus improving heat dissipation efficiency. The spiral groove is set to be less than one turn around the motor output shaft, which reduces the machining difficulty while ensuring good coolant flow.

[0028] 3. Multiple flow holes are provided around the bushing body near the coolant zone. These multiple flow holes allow coolant to enter and exit from multiple angles, significantly improving the flow rate and volume, and making the coolant in the cooling tank refresh more quickly and evenly. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0030] Figure 2 yes Figure 1 A cross-sectional view along the AA direction;

[0031] Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this application;

[0032] Figure 4 yes Figure 3 Cross-sectional view along the BB direction;

[0033] Figure 5 This is a schematic diagram of the overall structure of Embodiment 3 of this application;

[0034] Figure 6 yes Figure 5 A cross-sectional view along the CC direction.

[0035] Reference numerals in the attached drawings: 1. Bushing body; 2. Motor output shaft; 3. Oil seal; 4. Cooling tank; 5. Coolant zone; 6. Spiral groove; 7. Flow hole. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 This application will be described in further detail.

[0037] This application discloses a bushing oil seal structure that enhances the heat dissipation effect of coolant.

[0038] Example 1:

[0039] refer to Figure 1 and Figure 2A bushing oil seal structure for enhancing coolant heat dissipation includes a bushing body 1, a motor output shaft 2, and an oil seal 3. The bushing body 1 is fitted onto the motor output shaft 2 under high temperature conditions. After cooling, the bushing body 1 shrinks, and the bushing body 1 is tightly fixed to the motor output shaft 2. The oil seal 3 is rotatably fitted onto the bushing body 1. A cooling groove 4 filled with coolant is formed on the inner wall of the bushing body 1 near the motor output shaft 2. The cooling groove 4 is located at one end of the bushing body 1 near the coolant area 5 and communicates with the coolant area 5. The cooling groove 4 is arranged in an annular groove around the circumference of the motor output shaft 2. The end of the cooling groove 4 away from the coolant area 5 extends to the friction position between the bushing body 1 and the oil seal 3. In this embodiment, the friction position between the bushing body 1 and the oil seal 3 is located at the axial center of the cooling groove 4.

[0040] The cooling tank 4 directly guides the coolant to the inner side of the bushing body 1 at the friction position between the bushing body 1 and the oil seal 3, so that the coolant can absorb the heat generated by friction at close range, improve heat dissipation efficiency, reduce the risk of oil seal damage due to high temperature, extend the service life of oil seal and reduce equipment maintenance costs; and as the motor output shaft 2 rotates, the coolant will flow inside and outside the cooling tank 4, further improving heat dissipation efficiency.

[0041] The wall thickness of the bushing body 1 at the location of the cooling groove 4 is 2-3mm. The wall thickness of 2-3mm causes the cooling groove 4 to deform and crack due to the force and frictional stress on the wall while ensuring heat dissipation efficiency. In this embodiment, the wall thickness of the bushing body 1 at the location of the cooling groove 4 is 2mm.

[0042] The implementation principle of this application embodiment is as follows: coolant fills the cooling tank 4, and the coolant acts on the heat-generating area at close range in the cooling tank 4. The coolant makes accurate contact with the friction-generating area, and the coolant directly absorbs the heat generated by the friction between the bushing and the oil seal 3, thereby improving the heat dissipation efficiency and reducing the risk of the oil seal 3 being damaged due to high temperature.

[0043] Example 2:

[0044] refer to Figure 3 and Figure 4 The difference between this embodiment and Embodiment 1 is that: the cooling tank 4 has a spiral groove 6 on its wall. The spiral groove 6 extends from the end of the cooling tank 4 away from the coolant area 5 around the motor output shaft 2 to the point where the cooling tank 4 and the coolant area 5 are connected. The spiral groove 6 is arranged less than one turn around the motor output shaft 2, which reduces the processing difficulty while ensuring good coolant flow. The spiral groove 6 has multiple channels, and the multiple spiral grooves 6 are evenly distributed in a circular array along the circumference of the motor output shaft 2. In this embodiment, there are three spiral grooves 6, and the spiral groove 6 is arranged half a turn around the motor output shaft 2.

[0045] The spiral groove 6 has a groove depth of 0.1-0.5mm. The groove depth of 0.1-0.5mm increases the contact area between the coolant and the bushing body 1 and promotes the flow of coolant while ensuring the strength of the groove wall structure. This ensures that the cooling effect is improved without affecting the overall stability of the bushing. In this embodiment, the spiral groove 6 has a groove depth of 0.3mm.

[0046] The implementation principle of this application embodiment is as follows: when the motor output shaft 2 rotates clockwise or counterclockwise, the spiral groove 6 rotates with the motor output shaft 2. The coolant is guided by the spiral groove 6 and moves into the coolant area 5 or the cooling tank 4, which improves the fluidity of the coolant, so that the hot coolant is replaced with cold coolant and improves the heat dissipation efficiency.

[0047] When the bushing rotates with the motor output shaft 2, the multiple spiral grooves 6 work together to create a more complex and thorough turbulence in the coolant within the cooling tank 4, significantly improving the coolant's fluidity and heat exchange efficiency, avoiding uneven heat dissipation in localized areas, and allowing the heat in the entire friction area to be carried away evenly and quickly.

[0048] Example 3:

[0049] refer to Figure 5 and Figure 6 The difference between this embodiment and Embodiment 1 is that: a flow hole 7 is provided at one end of the bushing body 1 near the coolant zone 5, the axis of the flow hole 7 is perpendicular to the axis of the motor output shaft 2, and the flow hole 7 is provided through the wall of the cooling tank 4; there are multiple flow holes 7, and the multiple flow holes 7 are evenly arranged in a circular array along the circumference of the bushing body 1, and all the multiple flow holes 7 are provided through the wall of the cooling tank 4.

[0050] The implementation principle of this application embodiment is as follows: multiple flow holes 7 can realize the entry and exit of coolant from multiple angles, significantly improving the flow speed and flow volume, so that the coolant in the cooling tank 4 is renewed more quickly and evenly.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bushing oil seal structure for enhancing coolant heat dissipation, comprising a bushing body (1), a motor output shaft (2), and an oil seal (3), wherein the bushing body (1) is coaxially fixed on the motor output shaft (2), and the oil seal (3) is rotatably sleeved on the bushing body (1), characterized in that, The inner wall of the bushing body (1) is provided with a cooling groove (4) for filling with coolant. The cooling groove (4) is located at one end of the bushing body (1) near the coolant area (5) and is connected to the coolant area (5). The end of the cooling groove (4) away from the coolant area (5) extends to the friction position between the bushing body (1) and the oil seal (3).

2. The bushing oil seal structure for enhancing coolant heat dissipation according to claim 1, characterized in that, The friction point between the bushing body (1) and the oil seal (3) is located at the axial center of the cooling groove (4).

3. The bushing oil seal structure for enhancing coolant heat dissipation according to claim 1, characterized in that, The cooling groove (4) is arranged in an annular shape around the motor output shaft (2).

4. The bushing oil seal structure for enhancing coolant heat dissipation according to claim 3, characterized in that, The wall thickness of the bushing body (1) at the location of the cooling groove (4) is 2-3 mm.

5. The bushing oil seal structure for enhancing coolant heat dissipation according to claim 3, characterized in that, The cooling tank (4) has a spiral groove (6) on its wall. The spiral groove (6) extends from the end of the cooling tank (4) away from the coolant area (5) around the motor output shaft (2) to the point where the cooling tank (4) and the coolant area (5) are connected. The spiral groove (6) is set less than one turn around the motor output shaft (2).

6. The bushing oil seal structure for enhancing coolant heat dissipation according to claim 5, characterized in that, The spiral groove (6) has multiple channels, and the multiple spiral grooves (6) are evenly arranged in a circular array along the circumference of the motor output shaft (2).

7. A bushing oil seal structure for enhancing coolant heat dissipation according to claim 5, characterized in that, The spiral groove (6) has a groove depth of 0.1-0.5 mm.

8. The bushing oil seal structure for enhancing coolant heat dissipation according to claim 1, characterized in that, The bushing body (1) has a flow hole (7) at one end near the coolant zone (5). The axis of the flow hole (7) is perpendicular to the axis of the motor output shaft (2). The flow hole (7) passes through the wall of the cooling tank (4).

9. A bushing oil seal structure for enhancing coolant heat dissipation according to claim 8, characterized in that, The multiple flow holes (7) are arranged in a circular array along the circumference of the bushing body (1), and all the multiple flow holes (7) penetrate the wall of the cooling groove (4).

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