A wind turbine generator set threading pipe sealing structure and wind turbine generator set

Abstract

The application provides a wind turbine thread tube sealing structure and a wind turbine, and relates to the technical field of wind power generation. The wind turbine thread tube sealing structure comprises a thread tube, a first sealing assembly is arranged between the first end of the thread tube and a main shaft, and a second sealing assembly is arranged between the second end of the thread tube and a hollow shaft. The first sealing assembly comprises a first sealing sleeve, the first sealing sleeve is sealingly connected in the gap between the thread tube and the main shaft. The second sealing assembly comprises a second sealing sleeve and an oil discharge cylinder, the second sealing sleeve is sealingly connected in the gap between the thread tube and the hollow shaft. The two sealing end faces of the oil discharge cylinder are respectively in abutting cooperation with the end faces of the second sealing sleeve and the hollow shaft, and the oil discharge cylinder has an oil discharge channel. The application can solve the problem of poor sealing effect of the thread tube at both ends in the prior art, oil leakage, has good sealing effect, can timely discharge oil, greatly reduces the risk of oil leakage, is convenient to maintain, and reduces the maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, specifically to a sealing structure for a conduit in a wind turbine generator set and a wind turbine generator set. Background Technology

[0002] The transmission system of a wind turbine generator set consists of a main shaft assembly, a yaw assembly, a gearbox, a coupling, a generator, and a base. The main shaft assembly is connected to the wind turbine hub. The power of the slowly rotating wind turbine is transmitted through the hub and the main shaft, and then increased in speed by the gearbox before being transmitted to the generator, thus converting wind energy into mechanical energy, and then into electrical energy.

[0003] The transmission system of a wind turbine generator set includes a hollow cable shaft with a conduit inside for the power cable. A seal is installed between the planetary carrier of the gearbox and the hollow shaft to prevent lubricating oil from leaking into the conduit and contacting the power cable, corroding its sheath, or seeping into the slip rings, causing communication failures. However, currently, oil leaks frequently occur in the conduit of wind turbine transmission systems due to poor sealing or easy failure. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of poor sealing effect at both ends of the conduit in the prior art, which leads to oil leakage, thereby providing a sealing structure for the conduit of a wind turbine generator set and a wind turbine generator set.

[0005] To address the aforementioned problems, this invention provides a sealing structure for a wind turbine generator set's conduit, comprising a conduit disposed within the hollow shaft of the wind turbine generator set's main shaft and gearbox. A first sealing assembly is provided between the first end of the conduit and the main shaft, and a second sealing assembly is provided between the second end of the conduit and the hollow shaft. The first sealing assembly includes a first sealing sleeve fixedly disposed within the gap between the conduit and the main shaft, forming a sealed connection between the first sealing sleeve and the conduit. The second sealing assembly includes a second sealing sleeve and an oil drain cylinder. The second sealing sleeve is fixedly disposed within the gap between the conduit and the hollow shaft, forming a sealed connection between the second sealing sleeve and the conduit. The oil drain cylinder has a first sealing end face and a second sealing end face. The first sealing end face is located inside the hollow shaft and abuts against the end face of the second sealing sleeve, while the second sealing end face is located outside the hollow shaft and abuts against the end face of the hollow shaft. The oil drain cylinder has an oil drain channel, and the gap between the hollow shaft and the second sealing sleeve communicates with the oil drain channel.

[0006] Optionally, the inner peripheral wall of the first sealing sleeve is provided with at least one first sealing ring for axial sealing of the conduit.

[0007] And / or,

[0008] The inner circumferential wall of the second sealing sleeve is provided with at least one second sealing ring for axial sealing of the conduit.

[0009] Optionally, the first sealing sleeve includes a first sealing section extending out of the main shaft. A limiting flange is provided on the outer wall of the first sealing section. The first sealing sleeve is fixedly connected to the main shaft through a connecting plate, and the connecting plate abuts against the limiting flange and the end face of the main shaft.

[0010] Optionally, a third sealing ring is provided on the mating end face of the connecting plate and the spindle, which provides radial sealing along the spindle.

[0011] Optionally, a fourth sealing ring is provided on the second sealing end face of the oil drain cylinder for radial sealing along the hollow shaft.

[0012] Optionally, the outer peripheral wall of the oil drain cylinder and the inner wall of the hollow shaft abut against each other, and a fifth sealing ring is provided on the mating surface of the two.

[0013] Optionally, the oil drain cylinder includes a first cylinder section and a second cylinder section that are perpendicular to each other in the axial direction. The side wall of the first cylinder section is provided with an annular first oil drain hole, and the second cylinder section is provided with a second oil drain hole. The first oil drain hole and the second oil drain hole are connected to form an oil drain channel.

[0014] Optionally, the conduit includes a body section and a compensation section that are interconnected, and the body section and the compensation section are connected by a first sealing sleeve; one end of the compensation section extends out of the end face of the main shaft.

[0015] Optionally, the first sealing sleeve and / or the second sealing sleeve includes a sealing expansion sleeve and push rings disposed on both sides of the sealing expansion sleeve. The sidewall of the sealing expansion sleeve is provided with at least two through holes spaced apart circumferentially, and the two ends of the through holes are provided with tapered grooves. The push rings have tapered surfaces that mate with the tapered grooves. Each push ring is provided with connecting holes spaced apart circumferentially to correspond one-to-one with the through holes. Among the two push rings, at least one push ring has a threaded hole for connecting holes. The two push rings are securely connected to the tapered grooves at both ends by a tightening bolt.

[0016] In another aspect, the present invention provides a wind turbine generator set, including the wind turbine generator set conduit sealing structure described in any of the above technical solutions.

[0017] The present invention has the following advantages:

[0018] 1. Utilizing the technical solution of this invention, a first sealing sleeve is provided between the first end of the conduit and the main shaft, and the first sealing sleeve and the conduit are sealed together, providing a sealing barrier for the oil and preventing the oil in the central hole of the main shaft from flowing to the first end of the conduit; a second sealing sleeve is provided between the second end of the conduit and the hollow shaft, and the second sealing sleeve and the conduit are sealed together, providing a sealing barrier for the oil and preventing the oil in the hollow shaft from flowing to the second end of the conduit; by providing an oil drain cylinder, the first sealing end face and the second sealing end face of the oil drain cylinder seal the gap between the second sealing sleeve and the hollow shaft, and the excess oil is discharged in time through the oil drain channel, preventing oil blockage, pressure increase and new leakage, achieving timely oil drainage, and effectively reducing the risk of oil leakage. In this invention, the first end of the conduit and the main shaft are sealed together by a first sealing sleeve, and the second end of the conduit and the hollow shaft are sealed together by a second sealing sleeve. This effectively prevents oil leakage from both ends of the conduit, thus effectively protecting the cable inside the conduit. Furthermore, the structure is simple, the first and second sealing sleeves are easy to remove and replace periodically, and the operation is convenient. It can be maintained directly in the air without having to separate the main shaft and gearbox with a crane in the air, or even directly scrap the main shaft or gearbox. The sealing effect is reliable, and it is easy to replace directly, greatly reducing maintenance costs.

[0019] 2. By setting a first sealing ring on the inner circumferential wall of the first sealing sleeve, the first sealing ring plays the role of sealing and blocking the axial direction of the conduit, which can further improve the sealing effect between the first end of the conduit and the main shaft; correspondingly, by setting a second sealing ring on the inner circumferential wall of the second sealing sleeve, the sealing effect between the second end of the conduit and the hollow shaft can be further improved.

[0020] 3. A third sealing ring is installed at the first end of the conduit, on the mating end face of the connecting plate and the main shaft. On the one hand, it can prevent oil from leaking radially from the end face of the main shaft to the first end of the conduit, further improving the sealing effect of the first end of the conduit. On the other hand, it can prevent oil from leaking out into the engine room and causing pollution to the engine room.

[0021] 4. By setting a fourth sealing ring on the second sealing end face of the oil drain cylinder at the second end of the conduit, the leakage of oil from the hollow shaft end along the radial direction can be effectively prevented, further improving the sealing effect of the second end of the conduit.

[0022] 5. By setting a fifth sealing ring between the outer peripheral wall of the oil drain cylinder and the inner wall of the hollow shaft at the second end of the conduit, the oil leakage along the axial direction at the hollow shaft end can be effectively prevented, further improving the sealing effect at the second end of the conduit.

[0023] 6. By incorporating a sealing expansion sleeve and a push ring, the tapered mating surface between the sleeve and the ring allows the push ring to approach each other when the expansion bolts are tightened. This, in turn, expands the sealing expansion sleeve radially through the tapered mating surface. The outer ring of the sealing expansion sleeve is sealed to the spindle or hollow shaft, while the inner ring is sealed to the conduit, thus achieving a seal at both ends of the conduit. This structure is suitable for situations where the distance between the spindle and the conduit is large, providing reliable sealing and facilitating disassembly and maintenance. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A partial structural schematic diagram of the transmission system of a wind turbine generator set provided in an embodiment of the present invention is shown;

[0026] Figure 2 It shows Figure 1 Enlarged view of the structure at point A in the middle;

[0027] Figure 3 It shows Figure 1 Enlarged view of the structure at point B;

[0028] Figure 4 It shows Figure 3 Schematic diagram of the structure of the middle oil drain cylinder;

[0029] Figure 5 A schematic diagram of a second embodiment of the first and second sealing sleeves of the present invention is shown.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. First sealing assembly; 11. First sealing sleeve; 111. Limiting flange; 12. First sealing ring; 13. Connecting plate; 14. Third sealing ring; 15. First bolt; 16. Second bolt; 2. Second sealing assembly; 21. Second sealing sleeve; 22. Second sealing ring; 23. Fourth sealing ring; 24. Fifth sealing ring; 3. Oil drain cylinder; 31. First sealing end face; 32. Second sealing end face; 33. Oil drain channel; 34. First cylinder section; 341. First oil drain hole; 35. Second cylinder section; 351. Second oil drain hole; 41. Sealing expansion sleeve; 411. Tapered groove; 42. Push ring; 421. Tapered surface; 43. Expansion bolt; 10. Conduit; 101. Body section; 102. Compensation section; 20. Main shaft; 30. Gearbox; 40. Hollow shaft. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 this invention according to the specific circumstances.

[0035] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] To facilitate the introduction of the technical solution of the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments, but the embodiments should not be regarded as limitations on the present invention.

[0037] Example 1

[0038] A sealing structure for a conduit for a wind turbine generator set, referring to Figures 1-4 The system includes a conduit 10, which is disposed within the hollow shaft 40 of the wind turbine generator's main shaft 20 and gearbox 30. A first sealing assembly 1 is provided between the first end of the conduit 10 and the main shaft 20, and a second sealing assembly 2 is provided between the second end of the conduit 10 and the hollow shaft 40. The first sealing assembly 1 includes a first sealing sleeve 11, which is fixedly disposed within the gap between the conduit 10 and the main shaft 20, and the first sealing sleeve 11 and the conduit 10 are sealed together. The second sealing assembly 2 includes a second sealing sleeve 21 and an oil drain. The cylinder 3 and the second sealing sleeve 21 are fixedly disposed in the gap between the conduit 10 and the hollow shaft 40, and the second sealing sleeve 21 and the conduit 10 are sealed together. The oil drain cylinder 3 has a first sealing end face 31 and a second sealing end face 32. The first sealing end face 31 is located inside the hollow shaft 40 and abuts against the end face of the second sealing sleeve 21. The second sealing end face 32 is located outside the hollow shaft 40 and abuts against the end face of the hollow shaft 40. The oil drain cylinder 3 has an oil drain channel 33, and the gap between the hollow shaft 40 and the second sealing sleeve 21 is connected to the oil drain channel 33.

[0039] Using the technical solution of the present invention, a first sealing sleeve 11 is provided between the first end of the conduit 10 and the main shaft 20. The first sealing sleeve 11 and the conduit 10 are sealed together, which plays a role in sealing and blocking the oil, and can prevent the oil in the central hole of the main shaft 20 from flowing to the first end of the conduit 10. A second sealing sleeve 21 is provided between the second end of the conduit 10 and the hollow shaft 40. The second sealing sleeve 21 and the conduit 10 are sealed together, which plays a role in sealing and blocking the oil, and can prevent the oil in the hollow shaft 40 from flowing to the second end of the conduit 10. By providing an oil drain cylinder 3, the first sealing end face 31 and the second sealing end face 32 of the oil drain cylinder 3 seal the gap between the second sealing sleeve 21 and the hollow shaft 40, and the excess oil is discharged in time through the oil drain channel 33, preventing oil blockage, pressure increase and new leakage, achieving timely oil drainage and effectively reducing the risk of oil leakage. Furthermore, when the oil drain channel 33 becomes blocked, the oil drain cylinder 3 can be directly disassembled without disassembling the hollow shaft 40, greatly reducing maintenance costs. In this invention, the first end of the conduit 10 and the main shaft 20 are sealed together by the first sealing sleeve 11, and the second end of the conduit 10 and the hollow shaft 40 are sealed together by the second sealing sleeve 21. This effectively prevents oil leakage from both ends of the conduit 10, thereby effectively protecting the cable inside the conduit 10. Moreover, the structure is simple, the first sealing sleeve 11 and the second sealing sleeve 21 are easy to pull out, facilitating regular replacement. The operation is convenient, and maintenance can be performed directly in the air without having to separate the main shaft 20 and gearbox 30 with a crane in the air, or even directly scrap the main shaft 20 or gearbox 30. The sealing effect is reliable, and it is easy to replace directly, greatly reducing maintenance costs.

[0040] Specifically, Figure 1 In the middle, the left side is the first end of the conduit 10, and the right side is the second end of the conduit 10.

[0041] Optionally, the inner peripheral wall of the first sealing sleeve 11 is provided with at least one first sealing ring 12 for axial sealing of the conduit 10; and / or, the inner peripheral wall of the second sealing sleeve 21 is provided with at least one second sealing ring 22 for axial sealing of the conduit 10.

[0042] Optionally, at least one annular first sealing groove is formed on the inner peripheral wall of the first sealing sleeve 11. When multiple first sealing grooves are provided, they are spaced apart along the axial direction of the first sealing sleeve 11. A first sealing ring 12 is provided in each annular first sealing groove, with one first sealing ring 12 corresponding to each first sealing groove. Similarly, at least one annular second sealing groove is formed on the inner peripheral wall of the second sealing sleeve 21. When multiple second sealing grooves are provided, they are spaced apart along the axial direction of the second sealing sleeve 21. The term "multiple" includes two.

[0043] Optionally, the first sealing groove is located away from the first end of the conduit 10, and / or the second sealing groove is located away from the second end of the conduit 10. In this way, the first sealing ring 12 is located away from the first end of the conduit 10, and the second sealing ring 22 is located away from the second end of the conduit 10, which can extend the leakage path of the oil and improve the sealing effect of the first and second ends of the conduit 10.

[0044] Reference Figure 2 and Figure 3 In this embodiment, the first sealing sleeve 11 is provided with three first sealing rings 12 at a distance from the first end of the conduit 10; the second sealing sleeve 21 is provided with three second sealing rings 22 at a distance from the second end of the conduit 10.

[0045] Specifically, the interference fit between the first sealing sleeve 11 and the conduit 10 can further improve the sealing effect on the first end of the conduit 10.

[0046] Similarly, the interference fit between the second sealing sleeve 21 and the conduit 10 can further improve the sealing effect on the second end of the conduit 10.

[0047] Optionally, the first sealing sleeve 11 has mounting holes at both ends. By screwing in the second bolts 16 into the mounting holes, the first sealing sleeve 11 can be further securely connected to the conduit 10. After connecting the first sealing sleeve 11 and the conduit 10, it is installed into the center hole of the spindle.

[0048] By providing a first sealing ring 12 on the inner circumferential wall of the first sealing sleeve 11, the first sealing ring 12 plays a role in sealing and blocking the axial direction of the conduit 10, which can further improve the sealing effect between the first end of the conduit 10 and the main shaft 20; correspondingly, by providing a second sealing ring 22 on the inner circumferential wall of the second sealing sleeve 21, the sealing effect between the second end of the conduit 10 and the hollow shaft 40 can be further improved.

[0049] Optionally, the first sealing sleeve 11 includes a first sealing section extending out of the main shaft 20. A limiting flange 111 is provided on the outer wall of the first sealing section of the first sealing sleeve 11. The first sealing sleeve 11 is fixedly connected to the main shaft 20 through a connecting plate 13. The connecting plate 13 abuts between the limiting flange 111 and the end face of the main shaft 20.

[0050] Optionally, the connecting plate has a central hole, which is fitted onto the first sealing sleeve 11. Specifically, in this embodiment, the connecting plate 13 is a flange plate. A threaded hole is opened on the end face of the main shaft 20, and the central hole of the flange plate is fitted onto the first sealing sleeve 11. Then, the flange plate and the end face of the main shaft 20 are tightened by the first bolt 15. The first sealing sleeve 11 is inserted into the gap between the conduit 10 and the main shaft 20 until the limiting flange 111 of the first sealing sleeve 11 abuts against the end face of the connecting plate 13, i.e., the flange plate, thus completing the installation. When maintenance or replacement is required, the first bolt 15 on the flange plate and the radially arranged second bolt 16 on the first sealing sleeve 11 can be removed to pull out the first sealing sleeve 11.

[0051] Optionally, a third sealing ring 14 is provided on the mating end face of the connecting plate 13 and the main shaft 20 to provide radial sealing along the main shaft 20. The third sealing ring 14 on the mating end face of the connecting plate 13 and the main shaft 20 at the first end of the conduit 10 can prevent oil leakage from the end face of the main shaft 20 along the radial direction of the conduit 10, further improving the sealing effect at the first end of the conduit 10. Specifically, refer to... Figure 2 An annular third sealing groove is formed on the end face of the connecting plate 13 that mates with the main shaft 20. A third sealing ring 14 is embedded in the third sealing groove and installed on the end face of the main shaft 20 together with the connecting plate 13. On the one hand, it can prevent the oil between the mating end faces of the main shaft 20 and the connecting plate 13 from leaking radially to the first end of the conduit 10. On the other hand, it can prevent the oil from leaking outward into the engine room and causing pollution to the engine room.

[0052] Optional, refer to Figure 1 The conduit 10 includes a main body section 101 and a compensation section 102 that are interconnected. The main body section 101 and the compensation section 102 are connected by a first sealing sleeve 11. One end of the compensation section 102 extends out of the end face of the main shaft 20. The compensation section 102 is provided when the length of the conduit 10 is insufficient. That is, when the first end of the main body section 101 of the conduit 10 is located inside the main shaft 20, the conduit 10 is extended by providing the compensation section 102. One end of the compensation section 102 extends out of the main shaft 20. One of the second bolts 16 arranged radially on the first sealing sleeve 11 is tightened to abut against the compensation section 102 of the conduit 10, and the other is tightened to abut against the main body section of the conduit 10.

[0053] Optionally, an annular mounting flange is provided in the middle of the inner wall of the first sealing sleeve 11, and the inner diameter of the mounting flange is not less than the inner diameter of the conduit 10. When the first sealing sleeve 11 is installed, the mounting flange abuts against the end face of the main body section 101 of the conduit 10. Then, the compensation section 102 of the conduit 10 is installed inside the first sealing sleeve 11, and the end face of the compensation section 102 abuts against the mounting flange, thus the compensation section 102 is installed in place.

[0054] Optionally, the first sealing ring 12 is located between the body section 101 and the first sealing sleeve 11, that is, at the first end away from the conduit 10.

[0055] Optionally, when the first end of the conduit 10 does not extend beyond the main shaft 20, the first sealing section of the first sealing sleeve 11 extends beyond the first end of the conduit 10; when the conduit 10 is provided with a compensation section 102, and the compensation section 102 extends to the outside of the main shaft 20, such as... Figure 2 As shown, the length of the first sealing section of the first sealing sleeve 11 need not be longer than the length of the compensation section 102 extending out of the main shaft 20. (Refer to...) Figure 3 The second sealing sleeve 21 extends out of the second end of the conduit 10, but does not extend out of the hollow shaft 40, that is, the second sealing sleeve 21 is completely located inside the hollow shaft 40.

[0056] Optionally, the first sealing end face 31 of the oil drain cylinder 3 is an annular end face that mates with the end face of the second sealing sleeve 21; the second sealing end face 32 of the oil drain cylinder 3 is an annular end face that mates with the end face of the hollow shaft 40.

[0057] Optional, refer to Figure 3 , combined Figure 4 The second sealing end face 32 of the oil drain cylinder 3 is provided with a fourth sealing ring 23 for radial sealing along the hollow shaft 40. By providing the fourth sealing ring 23 on the second sealing end face 32 of the oil drain cylinder 3 at the second end of the conduit 10, the leakage of oil at the end of the hollow shaft 40 along the radial direction can be effectively prevented, further improving the sealing effect of the second end of the conduit 10.

[0058] Optionally, the outer peripheral wall of the oil drain cylinder 3 and the inner wall of the hollow shaft 40 abut against each other, and a fifth sealing ring 24 is provided on the mating surface of the two. By providing a fifth sealing ring 24 between the outer peripheral wall of the oil drain cylinder 3 and the inner wall of the hollow shaft 40 at the second end of the conduit 10, the leakage of oil at the end of the hollow shaft 40 along the axial direction can be effectively prevented, further improving the sealing effect at the second end of the conduit 10.

[0059] Optionally, the oil drain cylinder 3 includes a first cylindrical section 34 and a second cylindrical section 35 that are axially perpendicular to each other. The side wall of the first cylindrical section 34 has an annular first oil drain hole 341, and the second cylindrical section 35 has a second oil drain hole 351. The first oil drain hole 341 and the second oil drain hole 351 communicate to form an oil drain channel 33. Specifically, refer to... Figure 3 Since the second sealing sleeve 21 is located inside the hollow shaft 40 and does not extend out of the hollow shaft 40, one end of the first cylinder section 34 extends into the hollow shaft 40, and its first sealing end face 31 abuts against the end of the second sealing sleeve 21.

[0060] Specifically, multiple bolt holes are spaced circumferentially on the second section 35 of the oil drain cylinder 3. The axis of the bolt holes is parallel to the axis of the first section 34, and the bolt holes avoid the second oil drain hole 351. Corresponding bolt holes are provided on the shaft end of the hollow shaft 40. Bolts are screwed into the bolt holes to install the oil drain cylinder 3 onto the shaft end of the hollow shaft 40. When the oil drain channel 33 is blocked, only the bolts need to be removed to disassemble the oil drain cylinder 3 for cleaning or replacement, without disassembling the hollow shaft 40. This makes maintenance convenient and reduces maintenance costs.

[0061] Example 2

[0062] Reference Figure 5 In this embodiment, another embodiment of the first sealing sleeve 11 and / or the second sealing sleeve 21 is provided.

[0063] Specifically, the first sealing sleeve 11 and / or the second sealing sleeve 21 include a sealing expansion sleeve 41 and push rings 42 disposed on both sides of the sealing expansion sleeve 41. The sidewall of the sealing expansion sleeve 41 is provided with at least two through holes spaced apart in the circumferential direction, and tapered grooves 411 are provided at both ends of the through holes. The push rings 42 have tapered surfaces 421 that cooperate with the tapered grooves 411. Each push ring 42 is provided with connecting holes spaced apart in the circumferential direction that correspond one-to-one with the through holes. Among the two push rings 42, at least one push ring 42 has a threaded hole for its connecting hole. The two push rings 42 are securely connected to the tapered grooves 411 at both ends by a tightening bolt 43.

[0064] By setting up a sealing expansion sleeve 41 and a push ring 42, and due to the conical mating surface between the expansion sleeve and the push ring 42, tightening the expansion bolt 43 allows the push ring 42 to move closer together. This, in turn, expands the sealing expansion sleeve 41 radially through the conical mating surface. The outer ring of the sealing expansion sleeve 41 is sealed to the main shaft 20 or the hollow shaft 40, while the inner ring is sealed to the conduit 10, thus achieving a seal at both ends of the conduit 10. This structure is suitable for situations where the distance between the main shaft 20 and the conduit 10 is large, providing a good and reliable seal while facilitating disassembly and maintenance.

[0065] Example 3

[0066] A wind turbine generator set includes the sealing structure for the conduit used in the wind turbine generator set as described in any of the above technical solutions.

[0067] Based on the above description, this patent application has the following advantages:

[0068] 1. The first sealing component 1 and the second sealing component 2 simultaneously seal both ends of the conduit 10. The first sealing sleeve 11 prevents oil leakage to the first end of the conduit 10, and the second sealing sleeve 21 prevents oil leakage to the second end of the conduit 10, thereby sealing the oil at both ends and effectively isolating the oil from the cable inside the conduit 10. The structure is simple and the sealing effect is good. Furthermore, the first sealing sleeve 11 and the second sealing sleeve 21 can be directly removed for replacement or repair, greatly reducing the cost of oil leakage repair. By setting the oil drain cylinder 3, timely oil drainage can be achieved to prevent excessive oil and increased pressure from causing seal failure. Timely oil drainage effectively reduces the risk of oil leakage. At the same time, when the oil drain channel 33 is blocked, the oil drain cylinder 3 can be directly disassembled for repair without disassembling the hollow shaft 40 from the gearbox, or even scrapping the hollow shaft 40, greatly reducing the repair cost.

[0069] 2. The first sealing ring 12 and the second sealing ring 22 can seal and block both ends of the conduit 10 along the axial direction of the conduit 10, thereby further improving the sealing effect.

[0070] 3. The third sealing ring 14, the fourth sealing ring 23 and the fifth sealing ring 24 can respectively provide bidirectional sealing at both ends of the conduit 10 along the radial and axial directions of the conduit 10, thereby further improving the sealing effect.

[0071] 4. The first sealing sleeve 11 and / or the second sealing sleeve 21 adopt the structure of sealing expansion sleeve 41 and push ring 42, which not only has a good sealing effect, but also can be used in cases where the distance between the main shaft 20 and the conduit 10 is large, ensuring the sealing effect at both ends of the conduit 10.

[0072] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A sealing structure for a conduit in a wind turbine generator set, characterized in that, Includes a conduit (10), which is disposed inside the main shaft (20) of the wind turbine generator set and the hollow shaft (40) of the gearbox (30) of the wind turbine generator set. A first sealing assembly (1) is provided between the first end of the conduit (10) and the main shaft (20), and a second sealing assembly (2) is provided between the second end of the conduit (10) and the hollow shaft (40). The first sealing assembly (1) includes a first sealing sleeve (11), which is fixedly disposed in the gap between the conduit (10) and the main shaft (20), and the first sealing sleeve (11) and the conduit (10) are sealed together. The second sealing assembly (2) includes a second sealing sleeve (21) and an oil drain cylinder (3). The second sealing sleeve (21) is fixedly disposed in the gap between the conduit (10) and the hollow shaft (40), and the second sealing sleeve (21) and the conduit (10) are sealed together. The oil drain cylinder (3) has a first sealing end face (31) and a second sealing end face (32). The first sealing end face (31) is located inside the hollow shaft (40) and abuts against the end face of the second sealing sleeve (21). The second sealing end face (32) is located outside the hollow shaft (40) and abuts against the end face of the hollow shaft (40). The oil drain cylinder (3) has an oil drain channel (33), and the gap between the hollow shaft (40) and the second sealing sleeve (21) communicates with the oil drain channel (33). The first sealing sleeve (11) and / or the second sealing sleeve (21) include a sealing expansion sleeve (41) and push rings (42) disposed on both sides of the sealing expansion sleeve (41). The sidewall of the sealing expansion sleeve (41) is provided with at least two through holes spaced apart in the circumferential direction. The two ends of the through holes are provided with tapered grooves (411). The push rings (42) have tapered surfaces (421) that cooperate with the tapered grooves (411). Each push ring (42) is provided with connecting holes spaced apart in the circumferential direction that correspond one-to-one with the through holes. Among the two push rings (42), at least one of the push rings (42) has a threaded hole in the connecting hole. The two push rings (42) are fastened to the tapered grooves (411) at both ends by a tightening bolt (43).

2. The sealing structure for the conduit of a wind turbine generator set according to claim 1, characterized in that, The inner peripheral wall of the first sealing sleeve (11) is provided with at least one first sealing ring (12) for axial sealing of the conduit (10). And / or, The inner peripheral wall of the second sealing sleeve (21) is provided with at least one second sealing ring (22) for axial sealing of the conduit (10).

3. The sealing structure for the conduit of a wind turbine generator set according to claim 1 or 2, characterized in that, The first sealing sleeve (11) includes a first sealing section extending out of the main shaft (20). A limiting flange (111) is provided on the outer wall of the first sealing section. The first sealing sleeve (11) is fixedly connected to the main shaft (20) through a connecting plate (13). The connecting plate (13) abuts between the limiting flange (111) and the end face of the main shaft (20).

4. The sealing structure for the conduit of a wind turbine generator set according to claim 3, characterized in that, The connecting plate (13) and the main shaft (20) are provided with a third sealing ring (14) for radial sealing of the main shaft (20).

5. The sealing structure for the conduit of a wind turbine generator set according to claim 1 or 2, characterized in that, The second sealing end face (32) of the oil drain cylinder (3) is provided with a fourth sealing ring (23) for radial sealing of the hollow shaft (40).

6. The sealing structure for the conduit of a wind turbine generator set according to claim 1 or 2, characterized in that, The outer peripheral wall of the oil drain cylinder (3) and the inner wall of the hollow shaft (40) abut against each other, and a fifth sealing ring (24) is provided on the mating surface of the two.

7. The sealing structure for the conduit of a wind turbine generator set according to claim 1 or 2, characterized in that, The oil drain cylinder (3) includes a first cylinder section (34) and a second cylinder section (35) that are perpendicular to each other in the axial direction. The first cylinder section (34) has an annular first oil drain hole (341) on its side wall, and the second cylinder section (35) has a second oil drain hole (351). The first oil drain hole (341) and the second oil drain hole (351) are connected to form the oil drain channel (33).

8. The sealing structure for the conduit of a wind turbine generator set according to claim 1 or 2, characterized in that, The conduit (10) includes a body section (101) and a compensation section (102) that are connected to each other. The body section (101) and the compensation section (102) are connected by the first sealing sleeve (11). One end of the compensation section (102) extends out of the end face of the main shaft (20).

9. A wind turbine generator set, characterized in that, The wind turbine generator set conduit sealing structure includes any one of claims 1-8.

Images