Sealing structure of a gear box

Abstract

The present application belongs to the technical field of gear box, and discloses a sealing structure of gear box. The sealing structure of gear box comprises a box body and an output shaft, a sealing structure is arranged between the output shaft and the box body, the sealing structure is sleeved on the output shaft, a first chamber and a second chamber are formed between the sealing structure and the output shaft, the second chamber is arranged on the output side of the first chamber, a first sealing ring is arranged on the output side of the first chamber, the first sealing ring is used for sealing the lubricating oil and oil gas in the first chamber, the second chamber comprises a second oil return port and a first exhaust port, an anti-backflow component is arranged at the second oil return port, the anti-backflow component is used for preventing the lubricating oil and oil gas from flowing from the box body to the second chamber, and the first exhaust port can communicate with the external environment, so that the oil gas is output to the external environment.

Description

Technical Field

[0001] This invention relates to the field of gearbox technology, and more particularly to a sealing structure for a gearbox. Background Technology

[0002] Gearboxes have a wide range of applications, such as in wind turbine generator sets. Gearboxes are an important mechanical component widely used in wind turbine generator sets. Their main function is to transmit the power generated by the wind turbine under the action of electricity to the generator and enable it to achieve the corresponding speed. Since the gearbox needs to be connected to the generator, the oil and gas sealing between the gearbox and the generator becomes a major challenge.

[0003] The existing sealing between the gearbox and the motor is mainly achieved by setting a sealing ring on the gearbox, with an oil return port on the sealing ring. First, the sealing ring seals the gearbox, and then the leaked lubricating oil flows back to the gearbox through the oil return port.

[0004] Existing sealing structures can only reduce lubricant leakage, but cannot reduce lubricant vapor leakage, which will affect the safe operation of the motor. Summary of the Invention

[0005] The purpose of this invention is to provide a sealing structure for a gearbox, which aims to solve the problem that existing gearbox sealing structures cannot reduce oil and gas leakage.

[0006] To achieve this objective, the present invention adopts the following technical solution: a sealing structure for a gearbox, comprising a housing and an output shaft, wherein a sealing structure is provided between the output shaft and the housing;

[0007] The sealing structure is sleeved on the output shaft;

[0008] The sealing structure and the output shaft form a first chamber and a second chamber, with the second chamber located on the output side of the first chamber.

[0009] A first sealing ring is provided on the output side of the first chamber, and the first sealing ring is used to seal the lubricating oil and oil vapor in the first chamber;

[0010] The second chamber includes a second oil return port and a first exhaust port;

[0011] The second oil return port allows the lubricating oil and oil vapor from the second chamber to flow back into the housing;

[0012] The second oil return port is equipped with an anti-backflow component, which is used to prevent lubricating oil and oil vapor from flowing from the housing into the second chamber;

[0013] The first exhaust port can be connected to the external environment so that oil and gas can be output to the external environment.

[0014] Preferably, the anti-backflow component is a one-way valve that only allows oil and gas in the second chamber to flow from the second oil return port into the housing;

[0015] The second return port is connected to the return oil pipeline inside the tank, and the one-way valve is threadedly connected to the return oil pipeline.

[0016] Preferably, the anti-backflow component is a one-way valve with adjustable opening pressure.

[0017] Preferably, the one-way valve includes a conductor and a spring disposed within the valve body;

[0018] The conductive element is located near the second return oil port, and the conductive element can push the spring to conduct the valve body under force.

[0019] Preferably, the anti-backflow component includes an oil pipe;

[0020] The oil pipeline includes a pipe body and pipe fittings;

[0021] The pipe fitting is connected to one end of the pipe body;

[0022] The pipe fitting is connected to the second oil return port via a threaded oil return pipeline, and the other end of the pipe extends into the lubricating oil inside the housing.

[0023] Preferably, an exhaust pipe is connected to the first exhaust port, and a filter is installed on the exhaust pipe for filtering oil and gas.

[0024] Preferably, the sealing structure of the gearbox also includes bearings;

[0025] The bearing is disposed between the output shaft and the housing;

[0026] The sealing structure includes a first oil ring, which is sleeved on the output shaft, and the first oil ring, the output shaft, and the bearing form the first chamber.

[0027] Preferably, the sealing structure further includes a second oil ring and a first through cap;

[0028] The second oil ring is sleeved on the output shaft, and the first through cover is sleeved on the second oil ring, forming the second chamber between the first oil ring, the second oil ring and the first through cover.

[0029] Preferably, a second sealing ring is provided on the output side of the second chamber, and the second sealing ring is used to seal the lubricating oil and oil vapor in the second chamber.

[0030] Preferably, the first chamber is provided with a second oil return port, which is used to return the lubricating oil and oil vapor in the first chamber to the housing.

[0031] The beneficial effects of the present invention are as follows: In the technical solution of the present invention, by providing a first sealing ring and a second oil return port on the output side of the first chamber, the lubricating oil and oil vapor in the gearbox are prevented from leaking out of the first chamber. Through the second oil return port and the first exhaust port of the second chamber, not only can the lubricating oil and oil vapor leaking into the second chamber flow back into the gearbox, but also the oil vapor in the gearbox is prevented from flowing back to the second chamber through the second oil return port through the anti-backflow component. Furthermore, the oil vapor leaking into the second chamber can be discharged to the external environment through the first exhaust port provided in the second chamber. Compared with the sealing structure in the prior art, which can only seal the lubricating oil, this invention can not only seal the lubricating oil in the gearbox, but also seal the oil vapor in the gearbox, thereby improving the reliability of the seal. Attached Figure Description

[0032] Figure 1 This is a cross-sectional view of the sealing structure of the gearbox according to Embodiment 1 of the present invention relative to the first chamber;

[0033] Figure 2 This is a cross-sectional view of the sealing structure of the gearbox according to Embodiment 1 of the present invention relative to the second chamber;

[0034] Figure 3 This is a cross-sectional view of the one-way valve according to Embodiment 1 of the present invention;

[0035] Figure 4 This is a cross-sectional view of the sealing structure of the gearbox in Embodiment 2 of the present invention relative to the first chamber;

[0036] Figure 5 This is a cross-sectional view of the sealing structure of the gearbox in Embodiment 2 of the present invention relative to the second chamber;

[0037] Figure 6 This is a cross-sectional view of the sealing structure of the gearbox in Embodiment 2 of the present invention relative to the third chamber;

[0038] Figure 7 This is a cross-sectional view of the sealing structure of the gearbox in Embodiment 3 of the present invention relative to the second chamber.

[0039] In the diagram: 11. Housing; 12. Output shaft; 13. Sealing structure; 131. First sealing ring; 132. Second sealing ring; 133. First oil ring; 134. Second oil ring; 135. First through cover; 136. Third oil ring; 137. Second through cover; 14. First chamber; 141. First oil return port; 15. Second chamber; 151. Second oil return port; 152. Oil return pipeline; 153. First exhaust port; 154. Check valve; 1541. Valve body; 1542. Conductor; 1543. Spring; 155. Oil pipeline; 1551. Pipe body; 1552. Pipe connector; 156. Exhaust pipeline; 157. Filter; 16. Third chamber; 161. Third oil return port; 162. Second exhaust port; 17. Bearing. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0041] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0044] Example 1

[0045] First, refer to Figures 1 to 3 , Figure 1 This is a cross-sectional view of the sealing structure of the gearbox according to Embodiment 1 of the present invention relative to the first chamber; Figure 2 This is a cross-sectional view of the sealing structure of the gearbox according to Embodiment 1 of the present invention relative to the second chamber. The sealing structure of the gearbox provided by the present invention includes a housing 11 and an output shaft 12. A sealing structure 13 is provided between the output shaft 12 and the housing 11. The sealing structure 13 is sleeved on the output shaft 12. A first chamber 14 and a second chamber 15 are formed between the sealing structure 13 and the output shaft 12. The second chamber 15 is located on the output side of the first chamber 14. A first sealing ring 131 is provided on the output side of the first chamber 14. The first sealing ring 131 is used to seal the lubricating oil and oil vapor in the first chamber 14. The second chamber 15 includes a second oil return port 151 and a first exhaust port 153.

[0046] The second oil return port 151 allows the lubricating oil and oil vapor in the second chamber 15 to flow back into the housing 11; the second oil return port 151 is equipped with an anti-backflow component to prevent the lubricating oil and oil vapor from flowing back from the housing 11 into the second chamber 15; the first exhaust port 153 can communicate with the external environment so that the oil vapor can be output to the external environment.

[0047] Specifically, the first chamber 14 can accommodate the lubricating oil leaking from the housing 11, and the first sealing ring 131 near the output end in the first chamber 14 can seal the lubricating oil leaking from the housing 11 into the first chamber 14 to prevent it from leaking out. The first chamber 14 is provided with a first oil return port 141, which can return the lubricating oil and oil vapor in the first chamber 14 to the housing 11. The oil and gas in the second chamber 15 mainly come from two paths: the first path is that the oil and gas in the first chamber 14 leaks out of the first chamber 14 into the second chamber 15; the second path is that the oil and gas in the housing 11 enters the second chamber 15 through the oil return pipe 152 in the housing and enters the second chamber 15 through the second oil return port 151. The oil and gas generated by the first path can be discharged to the external environment through the first exhaust port 153 configured in the second chamber 15, thus preventing leakage to the motor. The oil and gas generated by the second path is prevented from entering the second chamber 15 through the second oil return port 151 by the anti-backflow component set on the oil return pipe 152, thus achieving a better seal for the oil and gas.

[0048] It is worth noting that those skilled in the art will understand that the first chamber 14 and the second chamber 15 can be an integral chamber or separate chambers, as long as a first sealing ring 131, a first oil return port 141, a first exhaust port 153, a second oil return port 151, and an anti-backflow component configured on the second oil return port 151 are provided to achieve sealing of the lubricating oil and lubricating oil vapor. If it is an integral chamber, the first sealing ring 131 divides the integral chamber into two parts: the side of the first sealing ring 131 closer to the bearing 17 is the first chamber 14, and the side of the first sealing ring 131 closer to the output side is the second chamber 15. Of course, setting the first chamber 14 and the second chamber 15 independently provides a better sealing effect for the lubricating oil.

[0049] The first chamber 14 and the second chamber 15 can be constructed using a labyrinth structure. Even if lubricating oil is stored in the first chamber 14 and the second chamber 15, it can be reversed and transported back to the gearbox through the labyrinth structure and the oil return port. It is worth mentioning that the labyrinth structure can refer to the labyrinth structure disclosed in existing patent CN216742820U, which is a conventional structure in this field.

[0050] The second oil return port 151 can be located in the second chamber 15 facing the housing 11. The second oil return port 151 passes through the housing 11 to form an oil return pipeline 152, so that the lubricating oil and lubricating oil vapor in the second chamber 15 can flow back to the housing 11 through the second oil return port 151 and the oil return pipeline 152. It is worth mentioning that the anti-backflow component can be located at the connection between the outlet of the oil return pipeline 152 and the gearbox. By setting the anti-backflow component at the very end of the oil return path of the oil return pipeline 152, the impact of the anti-backflow component on the returning lubricating oil and lubricating oil vapor can be minimized. Moreover, it can cut off the internal flow path of the lubricating oil and lubricating oil vapor in the housing 11 at the beginning of entering the second chamber 15, so as to achieve the best control of the flow direction.

[0051] The second oil return port 151 can be located on the lower side of the second chamber 15, and the first exhaust port 153 can be located on the upper side of the second chamber 15. Those skilled in the art will understand that, since the lubricating oil and the lubricating oil vapor mixture in the second chamber 15 are located on the lower side of the second chamber 15 due to their own weight, the lubricating oil and the lubricating oil vapor can flow back more smoothly from the lower second oil return port 151; due to the density of the oil vapor and other gases, they will be in a floating state, and the oil vapor can be discharged more smoothly from the upper first exhaust port 153.

[0052] The first chamber 14 is also provided with a first oil return port 141. The first oil return port 141 passes through the oil return pipeline 152 formed by the housing 11, so that the lubricating oil in the first chamber 14 can be returned to the housing 11 through the first oil return port 141 and the oil return pipeline 152.

[0053] The inner wall of the sealing structure 13 may be provided with a lubricating layer. The lubricating oil and oil vapor leaking into the sealing structure 13 are viscous. By providing a lubricating layer on the inner wall of the sealing structure 13, the friction between the lubricating oil and oil vapor and the inner wall of the sealing structure 13 is reduced, so as to avoid the lubricating oil and oil vapor from not being able to be discharged smoothly from the sealing structure 13, or even causing the subsequent sealing structure 13 to be unable to contain the lubricating oil and oil vapor.

[0054] Continue reading Figures 1 to 2 For example, the second chamber 15 is also provided with a second sealing ring 132; the second sealing ring 132 is connected to the rightmost side of the output shaft 12 inside the second chamber 15.

[0055] Specifically, a second sealing ring 132 is provided on the far right of the second chamber 15 to seal the lubricating oil and oil vapor present in the second chamber 15, so that they are contained in the second chamber 15 and can be discharged to the external environment through the first exhaust port 153 configured in the second chamber 15 to avoid contamination of the motor. A very small amount of leaked lubricating oil and oil vapor is returned to the housing 11 through the oil return pipe 152 via the second oil return port 151 configured in the second chamber 15.

[0056] Continue reading Figures 1 to 3 For example, the anti-backflow component is a one-way valve 154 that only allows oil and gas to flow from the second oil return port 151 through the oil return line 152 to the gearbox; the second oil return port 151 is connected to the oil return line 152 inside the housing 11, and the one-way valve 154 is threadedly connected to the oil return line 152.

[0057] Specifically, by setting the anti-backflow component to a one-way valve 154 that only allows oil and gas to flow from the second oil return port 151 through the oil return pipeline 152 to the gearbox, the risk of oil and gas in the housing 11 potentially entering the second chamber 15 through the second oil return port 151 and then leaking to the motor is directly avoided, ensuring the sealing effect of oil and gas in the gearbox.

[0058] Among them, the one-way valve 154 is preferably a commonly used electronic one-way valve. Those skilled in the art will understand that as long as it can control the liquid or gas to flow in one direction, that is, as long as the lubricating oil or lubricating oil gas can only flow back from the second chamber 15 to the housing 11, it is acceptable to select a mechanical valve, an electric valve or a manually controlled valve according to actual usage requirements.

[0059] The second return port 151 is connected to the return oil pipeline 152 inside the housing 11, and the one-way valve 154 is threadedly connected to the return oil pipeline 152 inside the housing 11. Specifically, the one-way valve 154 is threaded to the return oil pipeline 152 by providing an external thread on the outside of the valve body 1541 of the one-way valve 154 and installing it on the internal thread at the end of the return oil pipeline 152 through the external thread of the valve body 1541.

[0060] Continue reading Figures 1 to 2 For example, the anti-backflow component is a one-way valve 154 with adjustable opening pressure.

[0061] Specifically, by setting the anti-backflow component as a one-way valve 154 with adjustable opening pressure, that is, when the oil and gas in the second chamber 15 flows back into the housing 11, the opening pressure of the one-way valve 154 can be adjusted to allow even oil and gas at very low pressure to flow back into the housing 11 through the anti-backflow component.

[0062] The opening pressure of the anti-backflow component can be selected from 0.005 to 0.02 bar, that is, slight oil vapor and lubricating oil can conduct the spring 1543 of the one-way valve 154 to realize the return of lubricating oil and oil vapor in the second chamber 15 to the housing 11.

[0063] Continue reading Figures 1 to 3 For example, the one-way valve 154 includes a conductor 1542 and a spring 1543 disposed in the valve body 1541; the conductor 1542 is disposed near the second return port 151, and the conductor 1542 can push the spring 1543 to conduct the valve body 1541 under force.

[0064] Specifically, during normal operation of the gearbox, high pressure is generated inside the housing 11 due to high temperature. When the high pressure passes from the housing 11 through the valve body 1541 of the one-way valve 154, it compresses the spring 1543, keeping the valve body 1541 in a closed state and preventing oil from flowing into the second chamber 15. When the lubricating oil in the second chamber 15 reaches the one-way valve 154 through the second oil return hole 151, the gravity of the lubricating oil and oil vapor will push the guide 1542 to open the spring 1543, keeping the valve body 1541 in an open state, and then flowing back into the housing 11.

[0065] It is worth mentioning that, in order to ensure that the one-way valve 154 can be easily opened by the lubricating oil and oil vapor returning to the second return oil hole 151, the guide component 1542 is made of non-metallic material, such as plastic or nylon, to ensure its strength and precision while reducing weight. The spring 1543 preferably uses a small-diameter spring wire, so that it has a small opening force, ensuring that even a small amount of lubricating oil and oil vapor can open the one-way valve 154.

[0066] Continue reading Figures 1 to 3 For example, an exhaust pipe 156 is connected to the first exhaust port 153, and a filter 157 is disposed on the exhaust pipe 156 for filtering oil and gas.

[0067] Specifically, by connecting an exhaust pipe 156 to the first exhaust port 153, the lubricating oil vapor present in the second chamber 15 can be discharged through the exhaust pipe 156 connected to the first exhaust port 153. Furthermore, the oil vapor can be filtered by the filter 157 configured on the exhaust pipe 156 to ensure that the oil vapor discharged into the air will not cause pollution to the environment.

[0068] The filter 157 can be installed at the discharge end of the exhaust pipe 156 to allow the oil and gas in the second chamber 15 to be discharged more smoothly through the exhaust pipe 156. It is worth mentioning that the filter 157 is preferably an air filter, as air filters have high filtration efficiency, low flow resistance, and can be used continuously for a long time without maintenance. This allows for more effective discharge of oil and gas from the second chamber 15, ensuring that the filtered oil and gas is discharged into the external environment and preventing pollution. It is also worth mentioning that a gas collection device can be connected to the discharge outlet of the exhaust pipe 156 to collect the discharged oil and gas, reducing the impact on the exhaust from the second chamber 15. Furthermore, an exhaust fan can be installed at the first exhaust port 153 of the exhaust pipe 156 to draw in the oil and gas from the second chamber 15, achieving a faster and more thorough discharge of the oil and gas present in the second chamber 15.

[0069] Continue reading Figures 1 to 2 For example, the first oil ring 133 is connected to the output shaft 12 of the bearing 17 near the output side of the output shaft 12, and the first oil ring 133 and the housing 11 form the first chamber 14.

[0070] Specifically, a first chamber 14 is formed between the first oil ring 133 fixed on the right side of the bearing 17 and the inner side of the housing 11 and the output shaft 12. That is, the first chamber 14 is formed at the innermost side of the output end of the output shaft 12. The first chamber 14 can accommodate the lubricating oil leaking out of the gearbox and can prevent the lubricating oil and oil vapor from leaking out further, thus achieving the purpose of initially sealing the lubricating oil and oil vapor.

[0071] It is worth mentioning that the structure of the first oil ring 133 can be a labyrinth structure so that the lubricating oil can be blocked in the first chamber 14 and transported back to the gearbox side during operation.

[0072] Preferably, the sealing structure 13 further includes a second oil ring 134 and a first through cover 135; the second oil ring 134 is connected to the output shaft 12, the first through cover 135 is connected to the second oil ring 134, and the second chamber 15 is formed between the first oil ring 133, the second oil ring 134 and the first through cover 135.

[0073] Specifically, a second chamber 15 is formed between the first oil ring 133, the second oil ring 134, and the first through cover 135, so that the lubricating oil and oil vapor leaking from the housing 11 can enter the second chamber 15 for further sealing after passing through the first chamber 14, thus preventing the leakage of lubricating oil and oil vapor. The second oil ring 134 and the first through cover 135 can both adopt a labyrinth structure to ensure that during the operation of the gearbox, the lubricating oil can be blocked in the second chamber 15 and transported back to the gearbox side through the second oil return port 151 and the oil return pipeline 152.

[0074] Example 2

[0075] like Figures 4 to 6 As shown, the difference between this embodiment and Embodiment 1 is that the number of second chambers 15 is at least two. Taking the number of second chambers 15 as an example, that is, the sealing structure 13 includes a first chamber 14, a second chamber 15, and a third chamber 16; the structure of the third chamber 16 is basically the same as that of the second chamber 15; the sealing structure 13 includes a third oil ring 136 and a second through cover 137; the third oil ring 136 is connected to the output shaft 12, the second through cover 137 is connected to the third oil ring 136, and the third chamber 16 is formed between the second oil ring 134, the third oil ring 136, and the second through cover 137.

[0076] Specifically, a third chamber 16 is formed between the second oil ring 134, the third oil ring 136, and the second through cover 137. This allows the lubricating oil and oil vapor leaking from the housing 11 to pass through the first chamber 14, enter the second chamber 15, and finally enter the third chamber 16 for multi-step sealing, thus preventing the leakage of lubricating oil and oil vapor. The third oil ring 136 and the second through cover 137 can both adopt a labyrinth structure to ensure that during the operation of the gearbox, the lubricating oil can be blocked in the third chamber 16 and transported back to the gearbox side through the third oil return port 161.

[0077] Because the lubricating oil in the gearbox is sealed by the first sealing ring 131 at the rightmost end of the first chamber 14, only a portion of the lubricating oil liquid and lubricating oil gas leaking out of the first chamber 14 enters the second chamber 15; the second oil return port 151 in the second chamber 15 returns a portion of the lubricating oil liquid and gas to the housing 11 through the oil return pipe 152, and the first exhaust port 153 in the second chamber 15 discharges a portion of the lubricating oil gas to the external environment; only a small amount of lubricating oil liquid and lubricating oil gas enters the third chamber 16; the lubricating oil and oil gas in the third chamber 16 return to the housing 11 through the third oil return port 161, and the second exhaust port 162 in the third chamber 16 discharges a small amount of lubricating oil gas to the external environment. The first chamber 14 and the first sealing ring 131 at the output end of the first chamber 14 are used to isolate and seal the lubricating oil leaking from the inside and outside of the housing 11. The second chamber 15 and the third chamber 16 are used to gradually reduce the amount of oil and gas, thereby minimizing the leakage of lubricating oil liquid and gas to the motor and reducing the impact on the motor.

[0078] It is worth mentioning that the second sealing ring 132 can be set at the output end of the last second chamber 15; that is, in this embodiment, the second sealing ring 132 is set at the output end of the third chamber 16, so that the second sealing ring 132 can seal the possible leakage of lubricating oil in the gearbox and achieve the best sealing effect.

[0079] The number of second chambers 15 can also be three, and the three second chambers 15 can gradually reduce the impact of leaked oil and gas on the motor.

[0080] Example 3

[0081] like Figure 7 As shown, the difference between this embodiment and Embodiment 1 is that the anti-backflow component is an oil pipe 155; one end of the oil pipe 155 is connected to the second oil return port 151, and the other end of the oil pipe 155 extends into the lubricating oil inside the housing 11.

[0082] Specifically, by connecting one end of the oil pipe 155 to the second oil return port 151 and extending the other end into the lubricating oil inside the housing 11, the oil vapor in the housing 11 is prevented from flowing back from the second oil return port 151 to the second chamber 15 through the oil return pipe 152, thereby preventing the oil vapor from flowing back into the second chamber 15 and leaking out.

[0083] The oil pipe 155 includes a pipe body 1551 and a pipe connector 1552. The pipe connector 1552 is threadedly connected to the end threaded hole of the return oil pipe 152. One end of the pipe body 1551 is fixed by the pipe connector 1552, and the other end of the pipe body 1551 extends into the lubricating oil in the housing 11 so that the oil mist in the housing 11 cannot flow back into the second chamber 15 through the pipe body 1551.

[0084] The second oil return port 151 is connected to the oil return pipeline 152 inside the housing 11. The end of the oil return pipeline 152 is connected to the oil pipeline 155 through a flange to ensure the tightness of the connection between the pipelines.

[0085] In summary, the gearbox sealing structure 13 provided by the present invention, through the first sealing ring 131 connected in the first chamber 14 on the output shaft 12 near the output end, prevents the lubricating oil and oil vapor in the gearbox 11 from leaking out of the first chamber 14. Through the second oil return port 151 and the first exhaust port 153 of the second chamber 15, not only can the lubricating oil leaking into the second chamber 15 flow back into the gearbox 11, but also the anti-backflow component can prevent the oil vapor in the gearbox 11 from leaking out of the second oil return port 151 through the oil return pipe 152 into the second chamber 15. Furthermore, the first exhaust port 153 provided in the second chamber 15 can even discharge the oil vapor leaking into the second chamber 15 to the external environment. This not only seals the lubricating oil, but also seals the oil vapor in the gearbox, improving the reliability of the seal.

[0086] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A sealing structure for a gearbox, comprising a housing (11) and an output shaft (12), characterized in that, A sealing structure (13) is provided between the output shaft (12) and the housing (11). The sealing structure (13) is sleeved on the output shaft (12). The sealing structure (13) and the output shaft (12) form a first chamber (14) and a second chamber (15), and the second chamber (15) is disposed on the output side of the first chamber (14); The first chamber (14) is provided with a first sealing ring (131) on the output side. The first sealing ring (131) is used to seal the lubricating oil and oil vapor in the first chamber (14). The first chamber (14) is provided with a first oil return port (141). The first oil return port (141) is used to return the lubricating oil and oil vapor in the first chamber (14) to the housing (11). The second chamber (15) includes a second oil return port (151) and a first exhaust port (153); The second oil return port (151) allows the lubricating oil and oil vapor in the second chamber (15) to flow back into the housing (11); An anti-backflow component is provided at the second oil return port (151). The anti-backflow component is used to prevent lubricating oil and oil vapor from flowing from the housing (11) to the second chamber (15). The first exhaust port (153) can be connected to the external environment so that oil and gas can be output to the external environment; The backflow prevention component is a one-way valve (154) with adjustable opening pressure, and the opening pressure of the backflow prevention component is selected from 0.005 to 0.02 bar.

2. The sealing structure of the gearbox according to claim 1, characterized in that, The backflow prevention component is a one-way valve (154) that only allows oil and gas in the second chamber (15) to flow from the second oil return port (151) to the housing (11); The second oil return port (151) is connected to the oil return pipeline (152) inside the housing (11), and the one-way valve (154) is threadedly connected to the oil return pipeline (152).

3. The sealing structure of the gearbox according to claim 1 or 2, characterized in that, The one-way valve (154) includes a conductor (1542) and a spring (1543) disposed within the valve body (1541); The guide member (1542) is located near the second oil return port (151), and the guide member (1542) can push the spring (1543) to open the valve body (1541) under force.

4. The sealing structure of the gearbox according to claim 1, characterized in that, The backflow prevention component is an oil pipe (155); The oil pipeline (155) includes a pipe body (1551) and a pipe fitting (1552); The pipe fitting (1552) is connected to one end of the pipe body (1551); The pipe fitting (1552) is threadedly connected to the second oil return port (151) through the oil return pipeline (152), and the other end of the pipe body (1551) extends into the lubricating oil inside the box body (11).

5. The sealing structure of the gearbox according to claim 1, characterized in that, An exhaust pipe (156) is connected to the first exhaust port (153), and a filter (157) is provided on the exhaust pipe (156) for filtering oil and gas.

6. The sealing structure of the gearbox according to claim 1, characterized in that, It also includes bearings (17); The bearing (17) is disposed between the output shaft (12) and the housing (11); The sealing structure (13) includes a first oil ring (133), which is sleeved on the output shaft (12). The first oil ring (133), the output shaft (12), and the bearing (17) form the first chamber (14).

7. The sealing structure of the gearbox according to claim 6, characterized in that, The sealing structure (13) also includes a second oil ring (134) and a first through cap (135). The second oil ring (134) is sleeved on the output shaft (12), and the first through cover (135) is sleeved on the second oil ring (134). The second chamber (15) is formed between the first oil ring (133), the second oil ring (134) and the first through cover (135).

8. The sealing structure of the gearbox according to claim 1, characterized in that, The output side of the second chamber (15) is provided with a second sealing ring (132), which is used to seal the lubricating oil and oil vapor in the second chamber (15).

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