Sealing structure for hollow pipe of wind power gear box
By adding a sealing ring and a spiral groove structure to the wind turbine gearbox, the problem of oil leakage at low speeds was solved, achieving effective sealing of the oil and preventing minor oil leakage.
Patent Information
- Application Number
- CN202520564886.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-03-28
AI Technical Summary
In existing wind turbine gearboxes, the oil-slinging seal between the hollow shaft and hollow tube of the output gear is not effective at low speeds, resulting in a small amount of oil leakage.
A sealing ring is added to the existing structure. The inner wall of the sealing ring has a spiral groove. When the hollow shaft of the output gear rotates, it drives the sealing ring to rotate. The spiral groove forms an axial thrust to seal the oil. The oil is further sealed by the buffer ring groove and the second spiral groove to ensure that the oil does not leak.
It effectively avoids the problem of oil leakage at low speeds, achieves axial thrust sealing of the oil, and ensures that the oil does not leak to the outside of the gearbox.
Smart Images
Figure CN223662514U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wind turbine gearbox technology, specifically to a sealing structure for a hollow tube in a wind turbine gearbox. Background Technology
[0002] The wind turbine gearbox is a crucial mechanical component in a wind turbine generator set. Its primary function is to transmit the power generated by the wind turbine rotor under wind force to the generator, enabling it to achieve the corresponding rotational speed. The wind turbine gearbox structure includes a hollow shaft for the output gear with its center line aligned and a hollow tube. The hollow tube is used for cable routing and is located inside the hollow shaft. Both rotate in opposite directions, and an oil-throwing seal is installed between them to throw oil into a radially arranged return oil channel within the hollow shaft of the output gear, preventing oil leakage from the gearbox's internal cavity to the outside. However, the existing sealing structure has the following problem: when the wind turbine is at low speed, the oil-throwing seal's oil-throwing effect is poor, and a small amount of oil may leak from the seal out of the gearbox. Utility Model Content
[0003] The purpose of this utility model is to address the problem in the prior art where the oil-throwing seal between the hollow shaft and hollow tube of the output gear in the wind turbine gearbox has poor sealing effect and causes a small amount of oil leakage when the wind turbine is at a low speed. This invention provides a sealing structure for the hollow tube of the wind turbine gearbox.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A hollow tube sealing structure for a wind turbine gearbox includes a hollow output gear shaft with collinear centerlines and a hollow tube. The hollow tube is disposed inside the hollow output gear shaft, and an oil-throwing seal is provided between them. A sealing ring is also provided between them. The inner wall of the sealing ring fits against the hollow tube, and the outer wall of the sealing ring is fixed to the hollow output gear shaft. The sealing ring is located on the side of the oil-throwing seal away from the gearbox cavity. A first helical groove is provided on the inner wall of the sealing ring. Looking along the direction from the sealing ring to the oil-throwing seal, when the working rotation direction of the hollow output gear shaft is clockwise, the first helical groove is set to be left-handed; when the working rotation direction of the hollow output gear shaft is counterclockwise, the first helical groove is set to be right-handed.
[0006] The present invention, employing the aforementioned technical solution, adds a sealing ring to the existing structure. The hollow shaft of the output gear drives the sealing ring to rotate, and the oil leaking from the oil-throwing seal seeps into the first spiral groove through the gap between the sealing ring and the hollow tube. The rotation of the sealing ring causes the groove wall of the first spiral groove to exert an axial thrust on the oil, pointing towards the inner cavity of the gearbox, thereby achieving oil sealing. Compared to the existing technology where the oil-throwing seal between the hollow shaft and the hollow tube of the output gear in the wind turbine gearbox is not effective when the wind turbine is at low speed, resulting in a small amount of oil leakage, the present invention adds a sealing ring to the existing structure, which can generate an axial thrust on the oil to achieve oil sealing and avoid oil leakage when the wind turbine is at low speed.
[0007] Furthermore, the inner wall of the sealing ring is also provided with a buffer ring groove and a second spiral groove, the second spiral groove having the same rotation direction as the first spiral groove; the first spiral groove, the buffer ring groove, and the second spiral groove are connected in sequence, and the cross-sectional area of the buffer ring groove is larger than the cross-sectional areas of the first spiral groove and the second spiral groove; the buffer ring groove is used to store oil that still leaks after being sealed by the first spiral groove, and the second spiral groove is used to further seal the oil that leaks into the buffer ring groove, ensuring that no oil leaks to the outside of the gearbox.
[0008] Furthermore, the cross-section of the buffer ring groove is rectangular, the width of the buffer ring groove is greater than the width of the first spiral groove and the second spiral groove, and the depth of the buffer ring groove is greater than the depth of the first spiral groove and the second spiral groove; the buffer ring groove has a simple shape, is easy to process, and has a large volume, which can store a lot of oil.
[0009] Furthermore, the first and second helical grooves have the same cross-sectional shape, cross-sectional dimensions, and pitch, which facilitates manufacturing.
[0010] Furthermore, the first spiral groove is provided on the sealing ring on the side near the oil-slinging seal, and the length of the first spiral groove is longer than the length of the second spiral groove.
[0011] Furthermore, the sealing ring is fixed to the hollow shaft of the output gear by fastening screws.
[0012] Furthermore, the sealing ring is made of alloy steel.
[0013] Furthermore, the oil-slinging seal is equipped with a labyrinth sealing structure; the labyrinth structure provides a good sealing effect for the oil.
[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: by adding a sealing ring to the existing structure, an axial thrust can be generated on the oil to achieve the oil sealing effect and avoid the oil leakage problem when the fan is at a low speed; the buffer ring groove is used to store the oil that still leaks after being sealed by the first spiral groove, and the second spiral groove is used to further seal the oil that leaks in the buffer ring groove to ensure that no oil leaks to the outside of the gearbox. Attached Figure Description
[0015] Figure 1 This is a cross-sectional view of the present invention;
[0016] Figure 2 This is a cross-sectional view of the sealing ring.
[0017] The markings in the diagram are: 1-output gear hollow shaft, 2-hollow tube, 3-oil slinger seal, 4-sealing ring, 5-fastening screw, 6-gearbox inner cavity, 7-gearbox outer cavity, 11-spacer ring, 12-oil return channel, 21-support ring, 41-first spiral groove, 42-second spiral groove, 43-buffer ring groove. Detailed Implementation
[0018] The present invention will now be described in detail with reference to the accompanying drawings.
[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0020] This embodiment provides a sealing structure for a hollow tube in a wind turbine gearbox, such as... Figures 1-2 As shown, the device includes a hollow output gear shaft 1 and a hollow tube 2 with collinear centerlines. The hollow tube 2 is located inside the hollow output gear shaft 1, and an oil-slinging seal 3 is provided between them. A sealing ring 4 is also provided between them. The inner wall of the sealing ring 4 fits against the hollow tube 2, and the outer wall of the sealing ring 4 is fixed to the hollow output gear shaft 1. The sealing ring 4 is located on the side of the oil-slinging seal 3 away from the gearbox cavity 6. A first spiral groove 41 is provided on the inner wall of the sealing ring 4. Along the direction from the sealing ring 4 to the oil-slinging seal 3 (i.e., ... Figure 1 Looking from direction A, when the working rotation direction of the hollow output gear shaft 1 is clockwise, the first helical groove 41 is set to left-hand rotation; when the working rotation direction of the hollow output gear shaft 1 is counterclockwise, the first helical groove 41 is set to right-hand rotation; the sealing ring 4 is made of alloy steel; the oil slinger seal 3 has a labyrinth seal structure; in this embodiment, looking from direction A, the working rotation direction of the hollow output gear shaft 1 is clockwise, therefore... Figure 2 As shown, the first spiral groove 41 is configured to be left-handed;
[0021] The sealing ring 4 is fixed to the hollow shaft 1 of the output gear by fastening screws 5; specifically, the hollow shaft 1 of the output gear includes a spacer ring 11 fixedly disposed on its inner side, and the sealing ring 4 is fixed to the spacer ring 11 by fastening screws 5.
[0022] The hollow tube 2 includes a support ring 21 fixedly disposed on its outer side, and the inner wall of the sealing ring 4 is in contact with the support ring 21 on the hollow tube 2; the support ring 21 is used to support other parts (not shown in the figure);
[0023] The inner wall of the sealing ring 4 is also provided with a buffer ring groove 43 and a second spiral groove 42. The second spiral groove 42 has the same rotation direction as the first spiral groove 41. The first spiral groove 41, the buffer ring groove 43 and the second spiral groove 42 are connected in sequence. The cross-sectional area of the buffer ring groove 43 is larger than the cross-sectional area of the first spiral groove 41 and the second spiral groove 42.
[0024] The cross-section of the buffer ring groove 43 is rectangular. The width of the buffer ring groove 43 is greater than the width of the first spiral groove 41 and the second spiral groove 42, and the depth of the buffer ring groove 43 is greater than the depth of the first spiral groove 41 and the second spiral groove 42.
[0025] The cross-sectional shape, cross-sectional dimensions, and pitch of the first spiral groove 41 and the second spiral groove 42 are the same;
[0026] The first spiral groove 41 is provided on the sealing ring 4 on the side near the oil-slinging seal 3, and the length of the first spiral groove 41 is longer than the length of the second spiral groove 42.
[0027] The present invention, employing the aforementioned technical solution, adds a sealing ring 4 to the existing structure. The hollow shaft 1 of the output gear drives the sealing ring 4 to rotate. Oil leaking from the oil-throwing seal 3 seeps into the first spiral groove 41 through the gap between the sealing ring 4 and the hollow tube 2. The rotation of the sealing ring 4 causes the groove wall of the first spiral groove 41 to exert an axial thrust on the oil, pointing towards the inner cavity 6 of the gearbox, thereby achieving oil sealing. Compared with the prior art, where the oil-throwing seal between the hollow shaft and hollow tube of the output gear in the wind turbine gearbox is not effective when the wind turbine is at low speed, resulting in a small amount of oil leakage, the present invention adds a sealing ring to the existing structure, which can generate an axial thrust on the oil to achieve oil sealing and avoid oil leakage when the wind turbine is at low speed. At the same time, the buffer ring groove is used to store the oil that still leaks after being sealed by the first spiral groove, and the second spiral groove is used to further seal the oil leaking in the buffer ring groove, ensuring that no oil leaks to the outside of the gearbox.
[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A hollow tube sealing structure for a wind turbine gearbox, comprising a hollow output gear shaft (1) with collinear centerlines and a hollow tube (2), wherein the hollow tube (2) is disposed inside the hollow output gear shaft (1), and an oil-slinging seal (3) is provided between the two, characterized in that: A sealing ring (4) is provided between the two. The inner wall of the sealing ring (4) is in contact with the hollow tube (2). The outer wall of the sealing ring (4) is fixed on the hollow shaft (1) of the output gear. The sealing ring (4) is located on the side of the oil slinger seal (3) away from the inner cavity (6) of the gearbox. A first spiral groove (41) is provided on the inner wall of the sealing ring (4). Looking along the direction from the sealing ring (4) to the oil slinger seal (3), when the working rotation direction of the hollow shaft (1) of the output gear is clockwise, the first spiral groove (41) is set to left-hand rotation; when the working rotation direction of the hollow shaft (1) of the output gear is counterclockwise, the first spiral groove (41) is set to right-hand rotation.
2. The sealing structure of the hollow tube of the wind turbine gearbox according to claim 1, characterized in that: The inner wall of the sealing ring (4) is also provided with a buffer ring groove (43) and a second spiral groove (42), the second spiral groove (42) having the same rotation direction as the first spiral groove (41); the first spiral groove (41), the buffer ring groove (43) and the second spiral groove (42) are connected in sequence, and the cross-sectional area of the buffer ring groove (43) is larger than the cross-sectional area of the first spiral groove (41) and the second spiral groove (42).
3. The sealing structure of the hollow tube of the wind turbine gearbox according to claim 2, characterized in that: The buffer ring groove (43) has a rectangular cross-section. The width of the buffer ring groove (43) is greater than the width of the first spiral groove (41) and the second spiral groove (42). The depth of the buffer ring groove (43) is greater than the depth of the first spiral groove (41) and the second spiral groove (42).
4. The sealing structure of the hollow tube of the wind turbine gearbox according to claim 2, characterized in that: The first spiral groove (41) and the second spiral groove (42) have the same cross-sectional shape, cross-sectional size and pitch.
5. The sealing structure of the hollow tube of the wind turbine gearbox according to claim 4, characterized in that: The first spiral groove (41) is provided on the sealing ring (4) on the side close to the oil-slinging seal (3), and the length of the first spiral groove (41) is longer than the length of the second spiral groove (42).
6. The sealing structure of the hollow tube of the wind turbine gearbox according to claim 1, characterized in that: The sealing ring (4) is fixed to the hollow shaft (1) of the output gear by fastening screws (5).
7. The sealing structure of the hollow tube of the wind turbine gearbox according to claim 1, characterized in that: The sealing ring (4) is made of alloy steel.
8. The sealing structure of the hollow tube of the wind turbine gearbox according to claim 1, characterized in that: The oil-slinging seal (3) is equipped with a labyrinth seal structure.