Output rotating shaft seal structure

Abstract

The application relates to the technical field of output shaft sealing, in particular to an output rotary shaft sealing structure, which comprises a box body, a rotary shaft and a sealing assembly. The sealing assembly comprises a moving ring, a static ring, an end cover and a skeleton oil seal. The sealing assembly further comprises an O-shaped sealing ring. The static ring is arranged between the box body and the rotary shaft and is connected with the box body. The moving ring is fixedly connected on the rotary shaft. The end cover is fixedly connected with the box body. The end cover, the static ring and the moving ring are assembled to form a labyrinth seal. The skeleton oil seal is arranged between the moving ring and the end cover. The O-shaped sealing ring comprises an O-shaped sealing ring A and an O-shaped sealing ring B. The O-shaped sealing ring A is arranged between the end cover and the box body, and the O-shaped sealing ring B is arranged between the moving ring and the rotary shaft. The application solves the technical problem of large liquid oil and oil mist leakage in the existing output shaft sealing technology.

Description

Technical Field

[0001] This invention relates to the field of output shaft sealing technology, specifically to an output rotating shaft sealing structure. Background Technology

[0002] Wind turbine generators are devices that convert wind energy into electrical energy. The speed-increasing gearbox is a core component of the wind turbine, and its reliability directly affects the generator's power generation efficiency and lifespan. With the increasing megawatt-level capacity of wind turbines, the gearbox output shaft needs to be integrated with the motor, greatly complicating maintenance. Therefore, a high design life is required for the output shaft. The sealing structure of the output shaft within the gearbox is a key factor affecting its design life.

[0003] Existing technology, such as Chinese Patent Publication No. CN109114201A, discloses a labyrinth sealing structure and a gearbox structure, which provides a wind power gearbox including a gearbox and a labyrinth sealing structure. The labyrinth sealing structure includes a mounting base and an output shaft. The mounting base has a receiving cavity and an oil return port, and the receiving cavity is divided into at least three sequentially connected labyrinth cavities. The gearbox structure provided by this invention adopts a non-contact labyrinth sealing structure. By dividing the receiving cavity into multiple independent labyrinth cavities, and connecting the various independent labyrinth cavities through throttling gaps, a multi-level labyrinth structure is formed. This achieves non-contact sealing of the gearbox output shaft while also providing dustproof and waterproof functions between the output shaft and the mounting base.

[0004] However, the existing technologies mentioned above still have the following problems: Although the non-contact labyrinth seal structure effectively ensures the service life of the seal structure, the non-contact seal structure cannot effectively prevent leakage of liquid oil, especially the oil mist generated after the liquid oil is heated, resulting in a large amount of leakage. Over time, this will significantly affect the service life of the gearbox and is not suitable for high-megawatt level integration with motors. Summary of the Invention

[0005] This application provides an output rotary shaft sealing structure to solve the technical problem that the use of non-contact sealing structures in existing wind turbine gearbox output shaft sealing technology to ensure the service life of the gearbox leads to a large amount of leakage of liquid oil, especially oil mist generated after the liquid oil is heated.

[0006] This application provides the following technical solution: an output rotating shaft sealing structure, including a housing, an output rotating shaft, and a sealing assembly. The output rotating shaft is bearing-connected to the housing, and a sealing cavity is provided between the end of the output rotating shaft and the end of the housing. The sealing assembly is disposed within the sealing cavity. The sealing assembly includes a rotating ring, a stationary ring, and an end cap. The end cap is fixedly connected to the housing, and the stationary ring is placed within the sealing cavity and connected to the housing. The rotating ring includes a rotating ring body and a labyrinth portion. The rotating ring body is fixedly connected to the output rotating shaft. The end cap has an end cap groove, and the stationary ring has a stationary ring groove. The end cap groove and the stationary ring groove are assembled to form a labyrinth cavity, and the labyrinth portion is placed within the labyrinth cavity to form a labyrinth sealing structure. The sealing assembly also includes a skeleton oil seal, which is fixedly connected to the rotating ring and is placed between the rotating ring body and the end cap to form an oil seal sealing mechanism.

[0007] The beneficial effects of this application are:

[0008] 1. This application includes a non-contact labyrinth seal structure formed by assembling an end cover, a stationary ring, and a rotating ring, as well as a contact seal structure composed of a skeleton oil seal and a rotating ring. Compared to using only a labyrinth seal structure, this application can further prevent oil mist leakage through the skeleton oil seal, thereby improving the gearbox's lifespan.

[0009] 2. The labyrinth-type sealing structure in this application is simple and has a reasonable layout. During assembly, it can be formed simply by setting the sealing components in sequence. Finally, the end cap can be fixed to the box body with bolts to complete the installation. The operation is simple and convenient.

[0010] Furthermore, the sealing assembly also includes O-rings, namely O-ring A and O-ring B; O-ring A is disposed at the connection angle between the moving ring body and the output shaft to form a first sealing structure; O-ring B is disposed at the connection between the end cover and the housing to form a second sealing structure.

[0011] In this application, compared to existing non-contact seals, O-rings can fill the gaps at the joints of sealing components, thereby achieving further sealing between the sealing assemblies and effectively preventing the leakage of liquid oil, especially oil mist, from the output rotating shaft. O-ring A forms a first sealing structure at the connection angle between the rotating ring body and the rotating shaft, enhancing the sealing structure in this application and making the connection between the rotating shaft and the rotating ring body tighter, reducing the leakage of liquid oil and oil mist. The second sealing structure can increase the sealing performance between the end cap and the housing, reducing the outflow of liquid oil along the housing arm.

[0012] Furthermore, a connecting part is provided between the moving ring body and the labyrinth part; the labyrinth part includes a labyrinth ring, and a labyrinth protrusion is provided on the labyrinth ring; the labyrinth part does not contact the inner wall of the labyrinth cavity.

[0013] In this application, the labyrinth ring and labyrinth protrusion can form multiple interconnected tortuous paths within the labyrinth cavity, increasing the internal path length of the labyrinth cavity. When liquid oil and oil mist leak from inside the output rotating shaft into the labyrinth, the tortuous paths within the labyrinth cavity reduce the outward force of the liquid oil and oil mist, thereby reducing leakage. Simultaneously, the labyrinth portion does not contact the interior of the labyrinth cavity, preventing contact friction and thus ensuring the lifespan of the labyrinth sealing structure.

[0014] Furthermore, in the labyrinth sealing structure, one end of the labyrinth ring is located inside the stationary ring groove, and the other end is located inside the end cap groove.

[0015] In this application, the labyrinth sealing structure can form multiple chambers between the labyrinth ring, labyrinth protrusion, stationary ring, and end cap. The chambers are interconnected, which increases the flow path of liquid oil and oil mist, making it less likely for oil mist and liquid oil to leak.

[0016] Furthermore, the end cap includes an upper diameter section and a lower diameter section, with the end cap slot placed on the lower diameter section; the lower diameter section is also provided with an end cap groove.

[0017] In this application, the end cap groove is used to place the skeleton oil seal to form an oil seal sealing structure, which can greatly reduce the amount of oil mist leakage. Furthermore, a first oil return gap is provided between the stationary ring and the output rotating shaft.

[0018] In this application, the oil mist and liquid oil in the labyrinth cavity can flow back to the output rotating shaft through the first return oil gap.

[0019] Furthermore, a second oil return gap is provided between the moving ring body and the lower diameter section of the end cap.

[0020] In this application, the oil mist and liquid oil inside the skeleton oil seal can flow back to the labyrinth cavity through the second return oil gap, and then flow back to the output rotating shaft through the first return oil gap.

[0021] Furthermore, the upper part of the skeleton oil seal is provided with an oil seal baffle; the outer side of the moving ring is provided with a moving ring baffle.

[0022] In this application, the baffle can effectively prevent the skeleton oil seal and the moving ring from falling off during high-speed rotation, thus preventing oil seal failure and improving the service life of the gearbox. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of an output rotating shaft sealing structure according to the present invention;

[0024] Figure 2 for Figure 1 A magnified view of a portion of the image. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method:

[0026] The markings in the accompanying drawings include: output rotating shaft 1, housing 2, sealing assembly 3, bearing 4, first oil return gap 5, second oil return gap 6, rotating ring baffle 7, oil seal baffle 8, rotating ring body 31, labyrinth section 32, stationary ring 33, end cover 34, skeleton oil seal 35, O-ring A 36, and O-ring B 37.

[0027] Example 1

[0028] A sealing structure for an output rotary shaft includes a housing 2 and a stepped output rotary shaft 1. The stepped output rotary shaft 1 is rotatably connected to the housing 2 via a bearing 4. The stepped output rotary shaft 1 includes a large-diameter section and a small-diameter section. The large-diameter section of the stepped output rotary shaft is placed inside the housing 2, and one end of the small-diameter section extends out of the housing 2. A sealing cavity is formed between the large-diameter section, the small-diameter section, and the housing 2 for housing a sealing assembly 3.

[0029] The sealing assembly 3 includes a stationary ring 33 and an end cap 34. The stationary ring 33 is placed inside the sealing cavity, and its outer edge is in close contact with the inner side of the housing 2. A first oil return gap 5 is provided between the inner edge of the stationary ring 33 and the output rotating shaft 1. The side wall of the stationary ring 33 has a stationary ring groove, and the upper end of the stationary ring groove is connected to the end cap 34. The end cap 34 includes an upper diameter section and a lower diameter section. The upper diameter section of the end cap is fixed to the upper part of the housing 2 by bolts. The upper diameter section of the end cap has a transverse groove, and an O-ring seal A36 is provided in the transverse groove. The O-ring seal A36 is pressed against the upper part of the housing 2 by the end cap 34. The O-ring seal A36, the upper diameter section of the end cap, and the upper part of the housing 2 form a first sealing structure.

[0030] The lower diameter section of the end cap is provided with an end cap slot and a groove, the end cap slot being opposite to the stationary ring slot and flush on one side. The end cap slot and the stationary ring slot together form a labyrinth cavity. A moving ring is provided between the lower diameter section of the end cap and the small diameter section of the output rotating shaft, the moving ring including a moving ring body 31 and a labyrinth section 32.

[0031] The rotating ring body 31 is fixed to the small diameter section of the output rotating shaft by an interference fit. A transverse groove is provided on the connecting surface between the rotating ring body 31 and the small diameter section of the output rotating shaft. The transverse groove is located at the end of the rotating ring, and an O-ring seal B37 is provided in the transverse groove. The O-ring seal B37 is pressed against the rotating ring body 31 by the rotating ring body 31 to form a second sealing structure. A second oil return gap 6 is provided between the outer side of the rotating ring body 31 and the lower diameter section of the end cover.

[0032] The labyrinth section 32 includes a labyrinth ring with two parallel labyrinth protrusions. A connecting portion is provided between the labyrinth ring and the moving ring body 31. The labyrinth section 32 is entirely placed within the labyrinth cavity and does not contact the lower diameter section of the end cap or the stationary ring 33. The labyrinth section 32, the moving ring body 31, and the labyrinth cavity cooperate to form a labyrinth sealing structure. In the labyrinth sealing structure, one end of the labyrinth ring extends into the stationary ring groove, and the other end extends into the end cap groove. The labyrinth protrusions are positioned facing the side of the end cap 34 that is flush with the stationary ring 33.

[0033] The end cap 34 and the rotating ring body 31 form a receiving space for placing the skeleton oil seal 35, which is fixedly installed on the outer edge of the rotating ring body 31. The skeleton oil seal 35 includes two inner lips, which are tightly fitted to the outer edge of the rotating ring body 31. At the same time, the left end face and outer edge of the skeleton oil seal 35 are tightly fitted to the lower and upper diameter sections of the end cap 34, respectively. The end cap 34, the skeleton oil seal 35, and the rotating ring body 31 form an oil seal sealing structure.

[0034] The upper part of the skeleton oil seal 35 is provided with an oil seal baffle 8, which is fixedly connected to the end cover 34 by bolts. The inner side of the oil seal baffle 8 forms a baffle groove with the rotating ring, and a rotating ring baffle 7 is provided in the baffle groove. The rotating ring baffle 7 and the oil seal baffle 8 can prevent the skeleton oil seal 35 from slipping off the rotating ring.

[0035] The above are merely embodiments of the present invention, and the invention is not limited to the fields covered by these embodiments. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A sealing structure for an output rotating shaft, comprising a housing, an output rotating shaft, and a sealing assembly, wherein the output rotating shaft is bearing-connected to the housing, a sealing cavity is provided between the end of the output rotating shaft and the end of the housing, and the sealing assembly is disposed within the sealing cavity; the sealing assembly comprises a rotating ring, a stationary ring, and an end cap, the end cap being fixedly connected to the housing, characterized in that: The stationary ring is placed inside the sealed cavity, and the outer edge of the stationary ring is in close contact with the inner side of the box and connected to the box. The moving ring includes a moving ring body and a labyrinth part. The moving ring body is fixedly connected to the output rotating shaft. The end cover is provided with an end cover groove, and the stationary ring is provided with a stationary ring groove. The end cover groove and the stationary ring groove are assembled to form a labyrinth cavity. The labyrinth part is placed in the labyrinth cavity to form a labyrinth sealing structure and does not contact the inner wall of the labyrinth cavity. In the labyrinth sealing structure, one end of the labyrinth ring is located in the stationary ring groove, and the other end is located in the end cap groove; a connecting part is provided between the moving ring body and the labyrinth part; the labyrinth part includes a labyrinth ring, and two parallel labyrinth protrusions are provided on the labyrinth ring, and the labyrinth ring and labyrinth protrusions can form multiple connected tortuous paths in the labyrinth cavity; The end cap includes an upper diameter section and a lower diameter section, and the end cap slot is placed on the lower diameter section; the lower diameter section is also provided with an end cap groove; a first oil return gap is provided between the stationary ring and the output rotating shaft; a second oil return gap is provided between the rotating ring body and the lower diameter section of the end cap. The sealing assembly also includes a skeleton oil seal, which is fixedly connected to the moving ring. The skeleton oil seal is placed between the moving ring and the end cap to form an oil seal sealing mechanism. The skeleton oil seal includes two inner lips, which are tightly attached to the outer edge of the moving ring body.

2. The output rotating shaft sealing structure according to claim 1, characterized in that: The sealing assembly also includes O-rings, which include O-ring A and O-ring B; O-ring A is disposed at the connection angle between the moving ring body and the output rotating shaft to form a first sealing structure; O-ring B is disposed at the connection between the end cover and the housing to form a second sealing structure.

3. The output rotating shaft sealing structure according to claim 1, characterized in that: The upper part of the skeleton oil seal is provided with an oil seal baffle; the outer side of the moving ring is provided with a moving ring baffle.

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