Wind power generation main shaft sealing device and wind turbine generator set

Abstract

This application provides a wind turbine main shaft sealing device and a wind turbine generator set, relating to the technical field of wind power generation equipment. The wind turbine main shaft sealing device includes: a main shaft body with a first groove; a bushing coaxially disposed with the main shaft body; a second groove formed on one axial side of the bushing; the second groove and the first groove being radially opposite each other; and a limiting block connected to the bushing, one end of the limiting block being recessed within the first groove and the other end within the second groove. In this wind turbine main shaft sealing device, when the bushing is subjected to rotational force, the outer surface of the limiting block contacts the inner surfaces of the first and second grooves, thereby limiting the rotation of the bushing and preventing interference fit failure between the bushing and the main shaft body, thus reducing the risk of oil leakage.

Description

Technical Field

[0001] This application relates to the field of wind power generation equipment technology, and in particular to a wind power generator main shaft sealing device and a wind turbine generator set. Background Technology

[0002] With the increasing size of wind turbine generator sets, the bearings on the main shaft often employ a pair of tapered roller bearings, and the main shaft is mostly made of ductile iron. Sealing the front bearing, especially the oil-lubricated bearing, to prevent leakage is a challenging issue. For oil-lubricated systems, there are generally non-contact labyrinth structures and oil-sealed structures with bushings.

[0003] Because the axial positioning of the bearing requires the bearing shoulder of the spindle to have a certain height, if a non-contact labyrinth structure is used, the spindle shoulder will be too high, causing the high-strength parts on the surface of the spindle to be machined away, which will affect the strength of the spindle to a certain extent. In addition, the labyrinth structure has a certain risk of oil leakage.

[0004] The bushing has a contact structure. The bushing is made of a special material and undergoes heat treatment to achieve a high surface hardness. The bushing is interference-fitted onto the spindle shoulder or in front of the bearing. The outer surface of the bushing contacts the oil seal lip, resulting in high hardness and resistance to wear. However, during operation, slippage can easily occur between the bushing and the spindle body. Prolonged slippage can lead to interference fit failure, resulting in potential oil leakage and even the loss of negative clearance in the transmission system. Utility Model Content

[0005] In view of the above problems, this application provides a wind power generator main shaft sealing device and a wind power generator set to solve the problem that in the prior art, when the oil-sealed bearing sealing structure with bushing has a bushing, slippage easily occurs between the bushing and the main shaft body, and long-term slippage can easily lead to interference failure.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] A first aspect of this application provides a sealing device for the main shaft of a wind power generator, comprising:

[0008] The main spindle body is provided with a first groove;

[0009] A bushing is coaxially arranged with the main shaft body; a second groove is formed on one side of the bushing along the axial direction; the second groove and the first groove are arranged radially opposite to each other.

[0010] The limiting block is connected to the bushing, with one end of the limiting block embedded in the first groove and the other end embedded in the second groove.

[0011] In one possible implementation, the limiting block is bolted to the bushing.

[0012] In one possible implementation, the bottom wall of the second groove is formed with a plurality of threaded holes along the axial direction;

[0013] The limit block has multiple through holes, and the multiple through holes and multiple threaded holes are arranged one-to-one opposite each other along the axial direction;

[0014] The wind turbine main shaft sealing device also includes a fastening bolt, which passes through a through hole and is threadedly connected to a threaded hole.

[0015] In one possible implementation, a plurality of first grooves are provided on the spindle body, and the plurality of first grooves are spaced apart circumferentially on the spindle body.

[0016] The bushing has multiple second grooves, which are spaced apart circumferentially on the bushing; the multiple second grooves are radially opposite to the multiple first grooves.

[0017] There are multiple limiting blocks, with one end of each limiting block embedded in the first groove and the other end embedded in the second groove.

[0018] In one possible implementation, the spindle body is provided with a shoulder; a first groove is provided on one axial side of the shoulder;

[0019] The bushing includes a first connecting part and a second connecting part; the first connecting part is sleeved on the outer peripheral surface of the shoulder; the second connecting part is set at an angle to the first connecting part and is located on the side of the shoulder away from the first groove along the axial direction;

[0020] The first connecting part has a second groove formed on the side away from the second connecting part along the axial direction.

[0021] In one possible implementation, the first connecting portion and the shoulder are interference fit.

[0022] In one possible implementation, a first gap is formed radially between the second connecting portion and the main shaft body;

[0023] The wind turbine main shaft sealing device also includes sealant, which is filled in the first gap.

[0024] In one possible implementation, the first connecting portion has a groove on the side radially away from the shoulder.

[0025] In one possible implementation, the limiting block is clearance-fitted with the first groove and the second groove;

[0026] And / or, a second gap is formed between the limiting block and the first groove and the second groove, the width of the second gap being X, where X satisfies 0 < X ​​≤ 0.5 mm.

[0027] A second aspect of this application provides a wind turbine generator set, including the wind turbine main shaft sealing device as described above.

[0028] The wind turbine main shaft sealing device provided in this application embodiment has a first groove on the main shaft body and a second groove corresponding to the first groove on the bushing. The second groove and the first groove are arranged radially opposite to each other. One radial end of the limiting block is built into the first groove and the other end is built into the second groove. When the bushing is subjected to rotational force, the outer surface of the limiting block contacts the inner surface of the first groove and the second groove, thereby limiting the rotation of the bushing through the limiting block, thereby avoiding interference failure between the bushing and the main shaft body and reducing the risk of oil leakage.

[0029] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the wind power generation main shaft sealing device and wind power generator set provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is an assembly drawing of the wind power generator main shaft sealing device provided in the first embodiment of this application;

[0032] Figure 2 A perspective view of the main shaft body of the wind power generation main shaft sealing device provided in the first embodiment of this application;

[0033] Figure 3 A perspective view of the bushing of the wind power generation main shaft sealing device provided in the first embodiment of this application;

[0034] Figure 4 This is an assembly drawing of the wind power generation main shaft sealing device provided in the second embodiment of this application;

[0035] Figure 5 A perspective view of the bushing of the wind power generation main shaft sealing device provided in the second embodiment of this application;

[0036] Figure 6 A perspective view of the limiting block of the wind power generation main shaft sealing device provided in the second embodiment of this application;

[0037] Figure 7 This is an assembly diagram of the wind power generator main shaft sealing device provided in the third embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 10. Spindle body; 101. First groove; 11. Shoulder;

[0040] 20. Bushing; 201. Second groove; 202. Threaded hole; 203. First clearance; 204. Groove; 21. First connecting part; 22. Second connecting part;

[0041] 30. Limiting block; 301. Through hole; 302. Second gap;

[0042] 40. Tighten the bolts;

[0043] 50. Sealant. Detailed Implementation

[0044] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0045] Secondly, it should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0046] As described in the background art, the wind turbine generator set in the related art has the problem that slippage is easy to occur between the bushing and the main shaft body. Long-term slippage can easily lead to interference failure. The inventors have found that the reason for this problem is that the scheme of using radial pins between the bushing and the shaft shoulder has poor reliability and the pins are easy to be sheared off and fail.

[0047] To address the aforementioned technical problems, this application provides a wind turbine main shaft sealing device and a wind turbine generator set. The wind turbine main shaft sealing device includes: a main shaft body with a first groove; a bushing coaxially disposed with the main shaft body; a second groove formed on one side of the bushing along the axial direction; the second groove and the first groove being radially opposite each other; and a limiting block connected to the bushing, one end of the limiting block being embedded in the first groove and the other end being embedded in the second groove. In the wind turbine main shaft sealing device provided by this application, the main shaft body has a first groove, and the bushing has a second groove corresponding to the first groove, with the second groove and the first groove being radially opposite each other. One radial end of the limiting block is embedded in the first groove, and the other end is embedded in the second groove. When the bushing is subjected to rotational force, the outer surface of the limiting block contacts the inner surfaces of the first and second grooves, thereby limiting the rotation of the bushing through the limiting block, thus preventing interference failure between the bushing and the main shaft body and reducing the risk of oil leakage.

[0048] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0049] Please refer to Figures 1-7 The first aspect of this application provides a sealing device for a wind turbine main shaft, comprising:

[0050] The main spindle body 10 is provided with a first groove 101;

[0051] The bushing 20 is coaxially arranged with the main shaft body 10; the bushing 20 has a second groove 201 on one side along the axial direction; the second groove 201 and the first groove 101 are arranged radially opposite to each other.

[0052] The limiting block 30 is connected to the bushing 20. One end of the limiting block 30 is built into the first groove 101, and the other end is built into the second groove 201.

[0053] It should be noted that, in this article, axial direction refers to the axial direction of the spindle body 10; radial direction refers to the radial direction of the spindle body 10; and circumferential direction refers to the circumferential direction of the spindle body 10.

[0054] Please see Figure 1As shown, after heat treatment, the surface of the bushing 20 can achieve a high hardness. The bushing 20 is coaxially arranged with the spindle body 10 and is interference-fitted onto the shoulder of the spindle body 10 or in front of the bearing. The axial side of the bushing 20 can position the bearing. The outer surface of the bushing 20 contacts the oil seal lip, has high hardness, and is not easily worn. It is understood that since the bushing 20 is interference-fitted onto the spindle body 10, there is no radial displacement between the bushing 20 and the spindle body 10. Due to the positioning function of the bushing 20 on the bearing, axial movement between the bushing 20 and the spindle body 10 generally does not occur. Therefore, it is only necessary to restrict the circumferential rotation of the bushing 20 relative to the spindle body 10. The limiting block 30 and the bushing 20 can be connected by welding or by bolts.

[0055] The wind turbine main shaft sealing device provided in this application embodiment should be considered in conjunction with... Figure 1 and Figure 2 As shown, a first groove 101 is provided on the spindle body 10. Please combine it with the spindle body 10. Figure 1 and Figure 3 As shown, the bushing 20 has a second groove 201 corresponding to the first groove 101, and the second groove 201 and the first groove 101 are arranged radially opposite to each other; one radial end of the limiting block 30 is embedded in the first groove 101, and the other end is embedded in the second groove 201. Please refer to [link to relevant documentation]. Figure 1 As shown, the limiting block 30 and the bushing 20 can be connected by welding; when the bushing 20 is subjected to rotational force, the outer side of the limiting block 30 contacts the inner side of the first groove 101 and the second groove 201, thereby limiting the rotation of the bushing 20 through the limiting block 30, thereby avoiding interference failure between the bushing 20 and the spindle body 10 and reducing the risk of oil leakage.

[0056] Compared with the radial pin method used in related technologies, the bushing 20 is restricted from rotating relative to the spindle body 10 by the limiting block 30. This method has a larger contact area and stronger shear resistance, which can effectively prevent slippage and avoid the risk of shear failure of the pin after long-term operation.

[0057] In one possible implementation, please see Figure 4 As shown, the limiting block 30 is bolted to the bushing 20.

[0058] In this embodiment of the application, please refer to Figure 4 As shown, the limiting block 30 and the bushing 20 are connected by bolts, which makes the limiting block 30 and the bushing 20 detachably connected, which is easier to disassemble and maintain than welding.

[0059] In one possible implementation, please see Figure 5 As shown, the bottom wall of the second groove 201 is formed with multiple threaded holes 202 along the axial direction;

[0060] Please see Figure 6 As shown, the limiting block 30 has multiple through holes 301, and the multiple through holes 301 and multiple threaded holes 202 are arranged opposite each other along the axial direction.

[0061] Please see Figure 4 As shown, the wind power generator main shaft sealing device also includes a fastening bolt 40, which passes through the through hole 301 and is threadedly connected to the threaded hole 202.

[0062] In this embodiment, multiple threaded holes 202 are formed along the axial direction on the bottom wall of the second groove 201, and multiple through holes 301 are formed on the limiting block 30. Each limiting block 30 is fixed to the bushing 20 by multiple fastening bolts 40. This can effectively prevent slippage by limiting block 30 and ensure the connection strength and stability between limiting block 30 and bushing 20.

[0063] It should be noted that, as an alternative implementation, threaded holes can be made in the spindle body 10, and the limiting block 30 can be connected to the spindle body 10 by bolts. One radial end of the limiting block 30 is embedded in the first groove 101, and the other end is embedded in the second groove 201, thereby limiting the rotation of the bushing 20 by the limiting block 30. However, in order to ensure the overall mechanical performance and structural stability of the spindle body 10, connecting the limiting block 30 to the bushing 20 by bolts can achieve low-cost maintenance while ensuring system reliability.

[0064] In one possible implementation, a plurality of first grooves 101 are provided on the spindle body 10, and the plurality of first grooves 101 are spaced apart circumferentially on the spindle body 10.

[0065] The bushing 20 has a plurality of second grooves 201, which are spaced apart circumferentially on the bushing 20; the plurality of second grooves 201 are radially opposite to the plurality of first grooves 101.

[0066] There are multiple limiting blocks 30, with one end of each limiting block 30 being built into the first groove 101 and the other end being built into the second groove 201.

[0067] In this embodiment, a plurality of first grooves 101 are evenly spaced along the circumference on the main spindle body 10, and a plurality of second grooves 201 are evenly spaced along the circumference on the bushing 20. By setting a plurality of limiting blocks 30 to restrict the sliding between the bushing 20 and the main spindle body 10, the shear force borne by each limiting block 30 is dispersed and reduced, effectively reducing the risk of failure of a single limiting block 30.

[0068] In one possible implementation, please combine... Figure 1and Figure 2 As shown, the spindle body 10 is provided with a shoulder 11; the first groove 101 is provided on one axial side of the shoulder 11;

[0069] The bushing 20 includes a first connecting part 21 and a second connecting part 22; the first connecting part 21 is sleeved on the outer peripheral surface of the shoulder 11; the second connecting part 22 is set at an angle to the first connecting part 21, and the second connecting part 22 is located on the side of the shoulder 11 away from the first groove 101 along the axial direction;

[0070] The first connecting portion 21 has a second groove 201 formed on the side away from the second connecting portion 22 along the axial direction.

[0071] In this embodiment, the bushing 20 is configured with a first connecting portion 21 and a second connecting portion 22, with the second connecting portion 22 at an angle to the first connecting portion 21, thus forming an "L"-shaped bushing structure. After the bushing 20 is assembled with the spindle body 10, the first connecting portion 21 is fitted onto the outer peripheral surface of the shoulder 11, and the second connecting portion 22 is located on the side of the shoulder 11 axially away from the first groove 101. This reduces the amount of surface machining required on the spindle body 10, and minimizes the volume removed from areas with good mechanical properties, thereby enabling the spindle body 10 to achieve higher mechanical properties. The first groove 101 is located on one axial side of the shoulder 11, and the first connecting portion 21 forms a second groove 201 on the side axially away from the second connecting portion 22. This allows the axial side of the bushing 20 to engage and connect with the limiting block 30, while the other side can be used to position the bearing, without interference between the two.

[0072] In one possible implementation, the first connecting part 21 and the shoulder 11 are interference fit.

[0073] In this embodiment, the first connecting part 21 and the shoulder 11 are interference fit, thereby avoiding oil leakage due to radial clearance between the first connecting part 21 and the shoulder 11; at the same time, the rotation of the bushing 20 is restricted by the limiting block 30, thereby avoiding interference failure between the bushing 20 and the spindle body 10, and effectively reducing the risk of oil leakage.

[0074] In one possible implementation, please see Figure 4 As shown, a first gap 203 is formed radially between the second connecting part 22 and the main shaft body 10;

[0075] Please see Figure 7 As shown, the wind turbine main shaft sealing device also includes sealant 50, which fills the first gap 203.

[0076] In this embodiment, after the bushing 20 and the spindle body 10 are assembled, sealant 50 is applied to the first gap 203 between the second connecting part 22 and the spindle body 10 to prevent oil leakage.

[0077] Furthermore, sealant 50 can be an oil-resistant adhesive.

[0078] In one possible implementation, please see Figure 7 As shown, the first connecting part 21 has a groove 204 on the side radially away from the shoulder 11.

[0079] In this embodiment, a groove 204 is provided on the side of the first connecting portion 21 that is radially away from the shoulder 11. The groove 204 is circumferentially arranged along the outer peripheral surface of the bushing 20. Through the geometric constraint of the groove 204, the upward escape of lubricating oil under the action of centrifugal force can be restricted, thereby achieving the oil blocking effect.

[0080] In one possible implementation, the limiting block 30 is in clearance fit with the first groove 101 and the second groove 201;

[0081] And / or, please see Figure 7 As shown, a second gap 302 is formed between the limiting block 30 and the first groove 101 and the second groove 201. The width of the second gap 302 is X, and X satisfies 0 < X ​​≤ 0.5 mm.

[0082] In this embodiment, the limiting block 30 is fitted with the first groove 101 and the second groove 201 with a clearance fit, which facilitates the smooth placement of the limiting block 30 into the first groove 101 and the second groove 201 during assembly, ensuring assembly feasibility. At the same time, the clearance between the limiting block 30 and the first groove 101 and the second groove 201 cannot be too large. Otherwise, it will be difficult to form an effective constraint between the limiting block 30 and the first groove 101 and the second groove 201 during the operation of the wind turbine generator set, which will easily reduce the anti-slipping ability of the limiting block 30. Therefore, the width X of the second clearance 302 between the limiting block 30 and the first groove 101 and the second groove 201 must satisfy 0 < X ​​≤ 0.5 mm.

[0083] Furthermore, X satisfies 0.25mm≤X≤0.5mm, which facilitates the assembly of the limiting block 30 and ensures that the limiting block 30 forms an effective constraint with the first groove 101 and the second groove 201, thus ensuring the anti-slipping capability of the limiting block 30.

[0084] This application also provides a wind turbine generator set, including the wind turbine main shaft sealing device as described above.

[0085] Given that the wind turbine generator set in this embodiment includes the wind turbine generator main shaft sealing device described in any of the above embodiments, the structure and beneficial effects of the wind turbine generator set including the wind turbine generator main shaft sealing device will not be described in detail here.

[0086] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0087] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A sealing device for the main shaft of a wind power generator, characterized in that, include: The main spindle body is provided with a first groove; A bushing is coaxially disposed with the main shaft body; a second groove is formed on one side along the axial direction of the bushing; the second groove and the first groove are arranged radially opposite to each other. A limiting block is connected to the bushing, with one end of the limiting block embedded in the first groove and the other end embedded in the second groove.

2. The wind turbine main shaft sealing device according to claim 1, characterized in that, The limiting block is bolted to the bushing.

3. The wind power generator main shaft sealing device according to claim 2, characterized in that, The bottom wall of the second groove is formed with multiple threaded holes along the axial direction; The limiting block is provided with multiple through holes, and the multiple through holes and the multiple threaded holes are arranged one-to-one opposite each other along the axial direction; The wind turbine main shaft sealing device also includes a fastening bolt, which passes through the through hole and is threadedly connected to the threaded hole.

4. The wind turbine main shaft sealing device according to any one of claims 1-3, characterized in that, The main spindle body is provided with a plurality of the first grooves, and the plurality of the first grooves are arranged at circumferential intervals on the main spindle body. The bushing is provided with a plurality of second grooves, which are spaced apart circumferentially on the bushing; the plurality of second grooves are radially opposite to the plurality of first grooves. The number of limiting blocks is multiple, and one end of each limiting block is built into the first groove, and the other end is built into the second groove.

5. The wind turbine main shaft sealing device according to claim 1, characterized in that, The main shaft body is provided with a shoulder; the first groove is provided on one axial side of the shoulder; The bushing includes a first connecting portion and a second connecting portion; the first connecting portion is sleeved on the outer peripheral surface of the shoulder; the second connecting portion is set at an angle to the first connecting portion, and the second connecting portion is located on the side of the shoulder away from the first groove along the axial direction; The first connecting portion has a second groove formed on the side away from the second connecting portion along the axial direction.

6. The wind turbine main shaft sealing device according to claim 5, characterized in that, The first connecting part and the shoulder are interference fit.

7. The wind turbine main shaft sealing device according to claim 5, characterized in that, A first gap is formed radially between the second connecting part and the main shaft body; The wind turbine main shaft sealing device also includes a sealant, which fills the first gap.

8. The wind turbine main shaft sealing device according to claim 5, characterized in that, The first connecting portion has a groove on the side radially away from the shoulder.

9. The wind turbine main shaft sealing device according to any one of claims 1-3 or 5-8, characterized in that, The limiting block is clearance-fitted with the first groove and the second groove; And / or, the limiting block forms a second gap with the first groove and the second groove, the width of the second gap being X, where X satisfies 0 < X ​​≤ 0.5 mm.

10. A wind turbine generator set, characterized in that, Includes the wind turbine main shaft sealing device as described in any one of claims 1 to 9 above.

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