Sealing device for hollow pipe of wind power gear box

Abstract

The utility model discloses a wind power gear box hollow pipe sealing device, which relates to the technical field of gear boxes and comprises a hollow pipe, the input end of the hollow pipe is connected with a sun gear of an input planet carrier, and the output end of the hollow pipe is connected with an output shaft of a gear box; the sealing bearing is arranged between the hollow pipe and the output shaft; the oil collecting groove is formed in the output shaft and located at the front end of the sealing bearing, an annular groove is formed in the side, facing the sun gear, of the output shaft hole wall, a first oil return hole and a second oil return hole are formed in the output shaft, one end of the first oil return hole communicates with the oil collecting groove, the other end of the first oil return hole communicates with the annular groove, one end of the second oil return hole communicates with the annular groove, and the other end of the second oil return hole communicates with a cavity of the gearbox; the labyrinth seal is arranged between the hollow pipe and the output shaft and located at the rear end of the sealing bearing. And the end cover is sleeved on the hollow pipe and is used for fixing the labyrinth seal. According to the sealing device for the hollow pipe of the wind power gear box, the technical problem that an existing sealing device cannot conduct limited sealing is solved, and the technical effect of double sealing is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear box technical field, in particular to a hollow pipe sealing device of wind power gear box. BACKGROUND

[0002] In wind power generation equipment, the wind power gear box as core transmission component, its reliability directly influences the safe operation of unit, and the hollow pipe structure is adopted to realize the arrangement of the conductive slip ring at present mainstream double fed type and half direct drive type, needs the input end of hollow pipe to be fixed in the input planet carrier center, the output end is connected with the gear box output shaft, realizes relative rotation through bearing support. However, the prior art has the following urgent problems to be solved:

[0003] The traditional design adopts deep groove ball bearing as the support structure, although the rotation requirement under low speed can be met, but the bearing needs to rely on the lubricating oil in the gear box to be lubricated, since there is a cooperation gap between the bearing and the hollow pipe and the output shaft, the lubricating oil leakage is inevitably generated in the operation process, leading to the tower pollution, the gear box oil shortage damage risk, at the same time, the leaked oil cannot be effectively recycled, leading to the system oil circulation imbalance.

[0004] Therefore, how to provide a kind of hollow pipe sealing device of wind power gear box to improve sealing effect is the technical problem that the person skilled in the art needs to solve at present. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of hollow pipe sealing device of wind power gear box, solves the technical problem that the existing sealing device cannot be effectively sealed.

[0006] To achieve the above-mentioned purpose, the utility model provides a kind of hollow pipe sealing device of wind power gear box, comprising:

[0007] The hollow pipe is connected with the sun gear of the input planet carrier at the input end, and is connected with the output shaft of the gear box at the output end;

[0008] The sealing bearing is arranged between the hollow pipe and the output shaft;

[0009] The oil collecting groove is arranged on the output shaft and located at the front end of the sealing bearing, the side of the output shaft hole wall surface facing the sun gear is provided with an annular groove, the first oil return hole and the second oil return hole are arranged on the output shaft, one end of the first oil return hole is communicated with the oil collecting groove, and the other end is communicated with the annular groove, one end of the second oil return hole is communicated with the annular groove, and the other end is communicated with the cavity of the gear box;

[0010] The labyrinth seal is arranged between the hollow pipe and the output shaft and located at the rear end of the sealing bearing;

[0011] An end cover is sleeved on the hollow pipe and detachably connected with the output shaft for fixing the labyrinth seal.

[0012] Preferably, the inner ring of the sealing bearing is in interference fit with the hollow pipe, and the outer ring is in transition fit with the output shaft.

[0013] Preferably, a third oil return hole is arranged on the output shaft between the sealing bearing and the labyrinth seal, and a fourth oil return hole is arranged on the output shaft between the labyrinth seal and the end cover, and the third and fourth oil return holes are respectively communicated with the cavity of the gear box.

[0014] Preferably, the second, third and fourth oil return holes are vertically arranged on the output shaft, and the output shaft is laterally provided with a fifth oil return hole communicated with the second, third and fourth oil return holes, and the fifth oil return hole is communicated with the cavity of the gear box.

[0015] Preferably, the hole wall of the output shaft is provided with a hole shoulder, the hole shoulder is provided with a mounting hole, and the end cover is connected with the output shaft by cooperation of the mounting hole and a connecting piece.

[0016] Preferably, the connecting piece is a screw.

[0017] Preferably, the dismounting structure comprises a top plate and bolts, the end of the hollow pipe protruding from the output shaft is provided with a fixing groove, the top plate is fixed on the hollow pipe by a snap spring and the fixing groove, and the top plate is uniformly screw-connected with a plurality of bolts in the circumferential direction, and each bolt is in contact with the end face of the hole shoulder of the output shaft.

[0018] Preferably, the length of the threaded segment of the bolt outside the top plate is greater than the width of the sealing bearing.

[0019] With respect to the above background, the hollow pipe sealing device for a wind power gear box provided by the present application has a lubrication circulation system composed of an oil collecting groove, an annular groove, a first oil return hole and a second oil return hole, and even if a small amount of lubricating oil leaks into the oil collecting groove during normal operation, the lubricating oil can be returned to the cavity of the gear box in time through the oil return holes, thereby ensuring the cleanliness and recycling of the lubricating oil. When the sealing bearing fails unexpectedly, the lubricating oil in the oil collecting groove can quickly provide semi-soaking lubrication for the bearing, thereby saving valuable time for equipment maintenance, avoiding bearing damage and equipment failure caused by sudden oil shortage, and reducing maintenance cost and downtime loss. The labyrinth seal is arranged at the rear end of the sealing bearing, thereby further enhancing the reliability of the seal. When a small amount of lubricating oil leaks through the sealing bearing, the labyrinth seal at the rear end of the sealing bearing can effectively prevent further leakage of the lubricating oil, thereby achieving a double sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only part of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0021] Figure 1 A hollow pipe sealing device structure schematic view provided by the present application is provided for the wind power gear box.

[0022] Figure 2 A disassembly structure structure schematic view provided by the present application is provided.

[0023] Among them:

[0024] 1-hollow pipe, 2-sun gear, 3-output shaft, 4-seal bearing, 5-oil collecting groove, 6-annular groove, 7-first oil return hole, 8-second oil return hole, 9-labyrinth seal, 10-end cover, 11-third oil return hole, 12-fourth oil return hole, 13-fifth oil return hole, 14-connector, 15-top plate, 16-bolt. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] In order to make those skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0027] Referring to Figure 1 The present application provides a kind of hollow pipe sealing device of wind power gear box, comprising:

[0028] The hollow pipe 1 is connected with the sun gear 2 of the input planetary gear and the output shaft 3 of the gear box, the sealing bearing 4 is arranged between the hollow pipe 1 and the output shaft 3, the oil collecting groove 5 is arranged on the output shaft 3 and located at the front end of the sealing bearing 4, the annular groove 6 is arranged on the side of the output shaft 3 facing the sun gear 2, the first oil return hole 7 and the second oil return hole 8 are arranged on the output shaft 3, one end of the first oil return hole 7 is communicated with the oil collecting groove 5 and the other end is communicated with the annular groove 6, one end of the second oil return hole 8 is communicated with the annular groove 6 and the other end is communicated with the cavity of the gear box, the labyrinth seal 9 is arranged between the hollow pipe 1 and the output shaft 3 and located at the rear end of the sealing bearing 4, and the end cover 10 is sleeved on the hollow pipe 1 and detachably connected with the output shaft 3 and used for fixing the labyrinth seal 9.

[0029] Specifically, the sealing bearing 4 is arranged between the hollow pipe 1 and the output shaft 3, which not only provides support for the relative rotation of the hollow pipe 1 and the output shaft 3 and ensures smooth power transmission, but also effectively blocks the leakage of lubricating oil. On the output shaft 3, an oil collecting groove 5 is arranged at the front end of the sealing bearing 4, which can collect a small amount of lubricating oil leaked from the sealing bearing 4 and lubricate the sealing bearing 4 if the sealing fails. There is a semi-immersed lubrication. In order to ensure that the oil in the oil collecting groove 5 can be kept clean and recycled, an annular groove 6 is designed on the side of the output shaft 3 facing the sun gear 2, and a first oil return hole 7 and a second oil return hole 8 are also arranged on the output shaft 3. The first oil return hole 7 is communicated with the annular groove 6, and the second oil return hole 8 connects the annular groove 6 with the cavity of the gear box. When the output shaft 3 rotates one circle, a part of the oil will flow back to the annular groove 6, and then flow back to the cavity of the gear box through the first oil return hole 7 and the second oil return hole 8, thereby not only recycling the leaked lubricating oil and avoiding waste, but also preventing the lubricating oil from leaking to the external environment and protecting the surrounding environment.

[0030] At the rear end of the sealing bearing 4, the labyrinth seal 9 is arranged, which can play a secondary sealing role when a small amount of lubricating oil leaks from the sealing bearing 4, further preventing the leakage of lubricating oil. The end cover 10 is sleeved on the hollow pipe 1 and detachably connected with the output shaft 3, and the end cover 10 is used for fixing the labyrinth seal 9 to ensure that the position and state of the labyrinth seal 9 can be kept stable during operation.

[0031] The hollow pipe sealing device for the wind power gear box provided by the application comprises a lubrication circulating system composed of an oil collecting groove 5, an annular groove 6, a first oil return hole 7 and a second oil return hole 8. During normal operation, even if a small amount of lubricating oil leaks into the oil collecting groove 5, the lubricating oil can be returned to the gear box cavity in time through the oil return holes, so that the cleaning and recycling of the lubricating oil are ensured. When the sealing bearing 4 fails unexpectedly, the lubricating oil in the oil collecting groove 5 can quickly provide semi-soaking lubrication for the bearing, so that valuable time is gained for equipment maintenance, bearing damage and equipment failure caused by sudden oil shortage are avoided, and the maintenance cost and downtime loss are reduced. The labyrinth seal 9 is arranged at the rear end of the sealing bearing 4, so that the reliability of the sealing is further enhanced. When a small amount of lubricating oil leaks through the sealing bearing 4, the labyrinth seal 9 at the rear end of the sealing bearing 4 can effectively prevent further leakage of the lubricating oil, so that a double sealing effect is achieved.

[0032] On the basis of the above-mentioned embodiment, the inner ring of the sealing bearing 4 is in interference fit with the hollow pipe 1, and the outer ring is in transition fit with the output shaft 3.

[0033] That is, the inner ring of the sealing bearing 4 is in interference fit with the hollow pipe 1, so that the connection between the two is more compact and stable, and the outer ring is in transition fit with the output shaft 3, so that the sealing bearing 4 can be smoothly installed on the output shaft 3, and the gap between the two is moderate during operation.

[0034] On the basis of the above-mentioned embodiment, the third oil return hole 11 is arranged on the output shaft 3 between the sealing bearing 4 and the labyrinth seal 9, the fourth oil return hole 12 is arranged on the output shaft 3 between the labyrinth seal 9 and the end cover 10, the third oil return hole 11 and the fourth oil return hole 12 are respectively connected to the cavity of the gear box, the second oil return hole 8, the third oil return hole 11 and the fourth oil return hole 12 are vertically arranged on the output shaft 3, the output shaft 3 is transversely provided with the fifth oil return hole 13 which is respectively connected to the second oil return hole 8, the third oil return hole 11 and the fourth oil return hole 12, and the other end of the fifth oil return hole 13 is connected to the cavity of the gear box.

[0035] That is, the third oil return hole 11 is arranged, so that the lubricating oil between the sealing bearing 4 and the labyrinth seal 9 has a direct return channel, and the lubrication and oil return after the sealing bearing 4 is damaged can be realized through the cooperation of the third oil return hole 11 and the fourth oil return hole 12.

[0036] On the basis of the above embodiment, the hole wall of the output shaft 3 is provided with a hole shoulder, the hole shoulder is provided with a mounting hole, the end cover 10 is connected with the output shaft 3 through the cooperation of the connecting piece 14 and the mounting hole, the connecting piece 14 is a screw, specifically, the end cover 10 is fastened on the hole shoulder of the output shaft 3 through the screw, which ensures that the end cover 10 will not loosen or fall off during operation, and the screw connection has high strength and stability, can withstand large force and vibration, ensures the overall structural strength of the sealing device, and makes the installation and disassembly of the end cover 10 very simple and convenient. When maintenance or replacement of the sealing device is required, the end cover 10 can be easily removed by loosening the screw, improving the maintenance efficiency.

[0037] Referring to Figure 2 On the basis of the above embodiment, the disassembly structure includes a top plate 15 and a bolt 16, the hollow tube 1 protruding from the end of the output shaft 3 is provided with a fixing groove 17, the top plate 15 is connected to the hollow tube 1 through a snap spring 18 and the fixing groove 17, the top plate 15 is uniformly threadedly connected with multiple bolts 16 in the circumferential direction, each bolt 16 is in contact with the hole shoulder end face of the output shaft 3, the outer circle of the sealing bearing 4 and the inner hole of the output shaft 3 are in a small interference fit, and the right side of the sealing bearing 4 is in a clearance fit, the length of the threaded segment of the bolt 16 located outside the top plate 15 is greater than the width of the sealing bearing 4.

[0038] That is, the top plate 15 is tightly combined with the fixing groove 17 through the snap spring 18, so as to be limited on the hollow tube 1 and prevent the top plate 15 from being separated from the hollow tube 1, and the top plate 15 is uniformly distributed with multiple threaded holes in the circumferential direction, which are used for cooperating with the bolts 16. When the bolts 16 are installed, it is ensured that each bolt 16 can be accurately screwed into the threaded hole of the top plate 15, and the head of the bolt 16 is in close contact with the hole shoulder end face of the output shaft 3.

[0039] The cooperation mode of the outer circle of the sealing bearing 4 and the inner hole of the output shaft 3 adopts a combination of small interference fit and clearance fit, at the cooperation position, that is, the part where the outer circle of the sealing bearing 4 and the inner hole of the output shaft 3 are in contact, small interference fit is adopted, which means that the size of the outer circle of the sealing bearing 4 is slightly larger than the size of the inner hole of the output shaft 3, and a certain pressure needs to be applied during installation to install the sealing bearing 4 into the inner hole of the output shaft 3. Small interference fit can ensure that the sealing bearing 4 has sufficient fastening force in the inner hole of the output shaft 3, preventing displacement or shaking of the sealing bearing 4 during equipment operation, thereby ensuring the stability and accuracy of power transmission. At the same time, the small interference amount will not cause the installation process to be too difficult, facilitating disassembly operation during maintenance.

[0040] The right side of the sealing bearing 4 is in clearance fit, which means that there is a certain gap between the right side of the sealing bearing 4 and the inner hole of the output shaft 3. The clearance fit can make the sealing bearing 4 more easily enter the inner hole of the output shaft 3, reduce the resistance and friction during installation, and improve the installation efficiency. During disassembly, the clearance fit enables the force applied by the bolt 16 to be more effectively transmitted to the sealing bearing 4, making it easier to eject the sealing bearing 4 from the inner hole of the output shaft 3.

[0041] The length of the threaded segment of the bolt 16 located outside the top plate 15 is greater than the width of the sealing bearing 4, in order to ensure that the bolt 16 has enough travel to push the sealing bearing 4 when disassembling the sealing bearing 4.

[0042] When it is necessary to disassemble, maintain or replace the sealing bearing 4, first remove the end cover 10, and then limit the top plate 15 on the hollow tube 1 by the snap spring 18. Then, evenly screw a plurality of bolts 16 into the threaded holes of the top plate 15, so that the heads of the bolts 16 are in close contact with the hole shoulder end face of the output shaft 3. Next, use a suitable tool (such as a wrench) to gradually tighten the bolts 16. As the bolts 16 are tightened, an axial thrust is generated, which moves the sealing bearing 4 axially through the top plate 15 and smoothly ejects the sealing bearing 4 from the inner hole of the output shaft 3.

[0043] It should be noted that the relational terms such as first and second, and the like, are used merely to distinguish one entity from another entity, and do not necessarily require or imply that the entities are in any way related or ordered in time or space.

[0044] The principles and implementation modes of the present application are described by using specific examples in this paper. The above examples are only used to help understand the method and its core idea. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in many ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A wind turbine gearbox hollow pipe sealing device, characterized in that, The utility model relates to a hollow pipe (1) is connected with the sun gear (2) of input planetary carrier, and the output shaft (3) of gear box is connected with the output end, Seal bearing (4) is arranged between the hollow pipe (1) and the output shaft (3), Oil collecting groove (5) is arranged on the output shaft (3) and is located the front end of seal bearing (4), the side of the output shaft (3) hole wall surface is equipped with annular groove (6) to the sun gear (2), the output shaft (3) is equipped with first oil return hole (7), second oil return hole (8), one end of first oil return hole (7) is communicated with oil collecting groove (5), the other end is communicated with annular groove (6), one end of second oil return hole (8) is communicated with annular groove (6), and the other end is communicated with the cavity of gear box, Labyrinth seal (9) is arranged between the hollow pipe (1) and the output shaft (3) and is located the rear end of seal bearing (4), End cover (10) is sleeved on the hollow pipe (1), and with the output shaft (3) detachable connection is used for fixing the labyrinth seal (9). The inner ring of seal bearing (4) is interference fit with the hollow pipe (1), and the outer ring is transition fit with the output shaft (3).

2. The wind turbine gearbox hollow tube seal apparatus of claim 1, wherein, The third oil return hole (11) is arranged on the output shaft (3) between the seal bearing (4) and the labyrinth seal (9), the fourth oil return hole (12) is arranged on the output shaft (3) between the labyrinth seal (9) and the end cover (10), and the third oil return hole (11) and the fourth oil return hole (12) are communicated with the cavity of gear box respectively.

3. The wind turbine gearbox hollow tube seal apparatus of claim 1, wherein, The second oil return hole (8), the third oil return hole (11) and the fourth oil return hole (12) are vertically arranged on the output shaft (3), and the output shaft (3) is transversely provided with the fifth oil return hole (13) communicated with the second oil return hole (8), the third oil return hole (11) and the fourth oil return hole (12) respectively, and the fifth oil return hole (13) is communicated with the cavity of gear box.

4. The wind turbine gearbox hollow tube seal apparatus of claim 3, wherein, The hole wall of the output shaft (3) is provided with a hole shoulder, the hole shoulder is provided with a mounting hole, the end cover (10) is connected with the output shaft (3) by the cooperation of the connecting piece (14) and the mounting hole.

5. The hollow tube seal for a wind turbine gearbox according to claim 4, wherein, The connecting piece (14) is a screw.

6. The wind turbine gearbox hollow tube seal apparatus of claim 5, wherein, It also includes a disassembly structure, the disassembly structure includes top plate (15) and bolt (16), the end of the hollow pipe (1) protruding from the output shaft (3) is provided with a fixing groove (17), the top plate (15) is fixed on the hollow pipe (1) by the snap spring (18) and the fixing groove (17), the top plate (15) is uniformly screw connected with a plurality of bolt (16) in the circumferential direction, and each bolt (16) is in contact with the end face of the hole shoulder of the output shaft (3).

7. The wind turbine gearbox hollow tube seal apparatus of claim 5, wherein, The length of the threaded segment of the bolt (16) outside the top plate (15) is greater than the width of the seal bearing (4).

8. The wind turbine gearbox hollow tube seal apparatus of claim 7, wherein, ​

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