A left end sealing structure of a guide shaft of a wind power gear box

Abstract

The application discloses a wind power gear box guide shaft left end sealing structure with good sealing performance, a hollow guide shaft penetrates a left end and a right end in a wind power gear box, a fan variable pitch control line cable is passed through the hollow guide shaft and connected with a motor slip ring at the right end of the hollow guide shaft, a planetary carrier connecting part of a planetary carrier extends radially inward and an inner wall is opposite to a micro gap of an outer periphery of a shaft body II of the hollow guide shaft, an axial guide ring-shaped protrusion extending axially to the right to a sun gear inner hole is arranged at the outer periphery of the shaft body II of the hollow guide shaft, two radial O-shaped sealing rings are installed at intervals between the outer periphery of the shaft body II of the guide shaft and the inner periphery of the planetary carrier connecting part, a plurality of radial clamping grooves corresponding to a plurality of clamping blocks are arranged on the shaft body I of the hollow guide shaft, inner ends of the plurality of clamping blocks are clamped with the plurality of radial clamping grooves, and the sun gear is installed in the planetary carrier body and the inner hole of the sun gear surrounds the shaft body III of the hollow guide shaft.

Description

Technical Field

[0001] This invention relates to wind turbine gearboxes, and more particularly to a sealing structure for the left end of a wind turbine gearbox guide shaft. Background Technology

[0002] like Figure 1 As shown, a common wind turbine gearbox guide shaft left-end sealing structure includes a hollow guide shaft 1 comprising shaft body I 11, shaft body II 12, and shaft body III 13 connected sequentially from left to right with gradually increasing outer diameter; an end cover 2 comprising a cover 20 and radial end cover 21 extending radially outward from the cover 20 and axial end cover 22 extending axially to the right from the left end of the radial end cover 21; a planetary carrier 3 comprising a planetary carrier body 30 and a planetary carrier connecting part 31 extending radially inward from the planetary carrier body 30; an end face O-ring seal 4; two radial O-ring seals 5; several locking blocks 6; and a sun gear 7. The hollow guide shaft 1 passes through the left and right ends of the wind turbine gearbox. (For simplicity, the wind turbine pitch control cable...) Figure 1 (The wind turbine pitch control cable is not shown in the diagram, the same below) passes through the hollow guide shaft 1 and connects to the motor slip ring at the right end of the hollow guide shaft 1 (for simplicity, Figure 1 (The motor slip ring is not shown in the image, the same applies below). The cover body 20 of the end cover 2 is fitted onto the shaft body II 12 of the hollow guide shaft 1. The right end of the radial end cover 21 and the outer periphery of the axial end cover 22 are respectively fitted to the left end and inner periphery of the planetary carrier connection part 31 of the planetary carrier 3. The end face O-ring seal 4 is installed between the right end of the radial end cover 21 of the end cover 2 and the left end of the planetary carrier connection part 31 of the planetary carrier 3. Two radial O-ring seals 5 are installed at intervals to seal the inner periphery of the cover body 20 and the hollow guide shaft 1. Between the outer periphery of the shaft body II12 of the guide shaft 1; on the shaft body I11 of the hollow guide shaft 1, there are several radial grooves 110 that pass through the inside and outside and correspond to several locking blocks 6. The inner ends of several locking blocks 6 are engaged with several corresponding radial grooves 110, and the right end is fitted to the left end of the cover 20. The sun gear 7 is installed in the planet carrier 30, and its left end is spaced relative to the right end of the planet carrier connection part 31 of the planet carrier 3. The inner hole space surrounds the shaft body III13 of the hollow guide shaft 1.

[0003] The technical problems of the prior art wind turbine gearbox guide shaft left end sealing structure are that the two radial O-shaped sealing rings 5 will leak lubricating oil after long-term use and aging failure, the lubricating oil will flow through the two radial O-shaped sealing rings 5 from the sun gear 7, and then enter the hollow guide shaft 1 through the gap between the inner end of the plurality of clamping blocks 6 and the corresponding plurality of radial clamping grooves 110, and then drip on the fan variable pitch control line cable in the hollow guide shaft 1, and then flow to the right end of the hollow guide shaft 1 and the connection of the motor slip ring, which may cause lubricating oil leakage and pollution of the environment, and even cause short circuit and burn the motor, and the sealing performance and safety are poor, and the radial O-shaped sealing ring 5 must be repaired and replaced, and the maintenance cost is high. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a wind turbine gearbox guide shaft left end sealing structure with good sealing performance and safety and low maintenance cost.

[0005] To solve the above technical problems, the wind turbine gearbox guide shaft left end sealing structure of the present application comprises a hollow guide shaft 1 comprising a shaft body I, a shaft body II and a shaft body III connected in sequence from left to right and gradually increasing in outer diameter, a planetary carrier comprising a planetary carrier body and a planetary carrier connecting portion extending radially inward from the planetary carrier body, two radial O-shaped sealing rings, a plurality of clamping blocks and a sun gear.

[0006] The hollow guide shaft penetrates the left end and the right end in the wind turbine gearbox, and the fan variable pitch control line cable passes through the hollow guide shaft and is connected with the motor slip ring at the right end of the hollow guide shaft.

[0007] The planetary carrier connecting portion of the planetary carrier extends radially inward and the inner wall thereof is opposite to the outer periphery of the shaft body II of the hollow guide shaft with a slight gap, and an axially directed annular protrusion extending axially to the right into the inner hole of the sun gear is arranged at the right end of the planetary carrier connecting portion close to the outer periphery of the shaft body II of the hollow guide shaft.

[0008] The two radial O-shaped sealing rings are installed with a gap between the outer periphery of the shaft body II of the guide shaft and the inner periphery of the planetary carrier connecting portion.

[0009] The shaft body I of the hollow guide shaft is provided with a plurality of radial clamping grooves corresponding to the plurality of clamping blocks; and the inner end of the plurality of clamping blocks is clamped with the corresponding plurality of radial clamping grooves.

[0010] The sun gear is installed in the planetary carrier body and the inner hole thereof surrounds the shaft body III of the hollow guide shaft.

[0011] Preferably, the axial section of the axial guide annular protrusion is tapered with the left wider and the right narrower.

[0012] Preferably, the axial width of the part of the shaft body II of the hollow guide shaft near the planet carrier connecting part of the planet carrier is smaller than the axial width of the shaft body II.

[0013] Preferably, the outer periphery of the shaft body III of the hollow guide shaft is provided with an annular groove, one end of which is located near the left side below the right end of the axial guide annular protrusion, and the other end is located at the right side away from the right end below the axial guide annular protrusion.

[0014] Preferably, the two ends of the annular groove provided on the outer periphery of the shaft body III of the hollow guide shaft are inclined structures.

[0015] Preferably, each of the plurality of clamping blocks comprises a connecting part and a clamping part extending radially inward from the connecting part, the axial size of the clamping part being smaller than the axial size of the connecting part, and the clamping part of each of the plurality of clamping blocks is clamped with one of the plurality of radial clamping grooves on the shaft body I of the hollow guide shaft.

[0016] The present application comprises the following beneficial effects;

[0017] In the present application, the planet carrier connecting part of the planet carrier extends radially inward and the inner wall is opposite to the micro-gap of the outer periphery of the shaft body II of the hollow guide shaft, the right end of the planet carrier connecting part is provided with an axial guide annular protrusion extending axially to the right into the inner hole of the sun gear near the outer periphery of the shaft body II of the hollow guide shaft, and two radial O-shaped sealing rings are installed in a spaced manner between the outer periphery of the shaft body II of the guide shaft and the inner periphery of the planet carrier connecting part.

[0018] Therefore, after the lubricating oil lubricates the meshing point of the sun gear, it will be blocked and guided by the axial guide annular protrusion when flowing through the planet carrier, and cannot directly flow to the position where the two radial O-shaped sealing rings are installed in a spaced manner between the outer periphery of the shaft body II of the guide shaft and the inner periphery of the planet carrier connecting part. Therefore, after the two radial O-shaped sealing rings are worn and aged, the lubricating oil will not flow to the inner end of the plurality of clamping blocks and the clamping of the plurality of radial clamping grooves corresponding to the plurality of clamping blocks, and will not enter the hollow guide shaft through the gap existing at the clamping position of the plurality of radial clamping grooves, drip on the fan pitch control cable in the hollow guide shaft, and flow to the connection between the right end of the hollow guide shaft and the motor slip ring through the outer periphery of the fan pitch control cable, so as to cause lubricating oil leakage and environmental pollution, and even cause short circuit and burn the motor. The sealing performance and safety are good, and the radial O-shaped sealing ring does not need to be replaced, so the maintenance cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic view of the left end sealing structure of the existing wind turbine gearbox guide shaft;

[0020] Figure 2 is a schematic view of a left end sealing structure of a guide shaft of a wind turbine gearbox according to the present application. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present application will be described in detail below with reference to the drawings.

[0022] In the description of the present application, it should be understood that the terms "left", "right", "inner", "outer", "radial", "axial" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, in the description of the present application, the meaning of "several" is three or more, unless otherwise explicitly and specifically limited.

[0023] Referring to Figure 2 The left end sealing structure of the guide shaft of the wind turbine gearbox according to the present application shown in the drawings comprises a hollow guide shaft 1 comprising shaft body Ⅰ 11, shaft body Ⅱ 12 and shaft body Ⅲ 13 connected integrally in sequence from left to right and gradually increasing in outer diameter, a planetary carrier 3 comprising a planetary carrier body 30 and a planetary carrier connecting portion 31 extending radially inward from the planetary carrier body 30, two radial O-rings 5, several clamping blocks 6 and a sun gear 7; wherein the hollow guide shaft 1 penetrates the left end and the right end inside the wind turbine gearbox, the fan variable pitch control line cable (for the sake of simplicity, Figure 2 not drawn in the drawings, the same below) passes through the hollow guide shaft 1 and is connected with the motor slip ring at the right end of the hollow guide shaft 1 (for the sake of simplicity, Figure 2The motor slip ring is not shown, same below); The planet carrier connection part 31 of the planet carrier 3 extends radially inward and the inner wall is opposite to the outer periphery of the shaft body II 112 of the hollow guide shaft 1 with a slight gap, the right end of the planet carrier connection part 31 is provided with an axial guide ring-shaped protrusion 32 extending axially to the right into the inner hole of the sun gear 7; The two radial O-shaped sealing rings 5 are installed with a gap between the outer periphery of the shaft body II 112 of the guide shaft 1 and the inner periphery of the planet carrier connection part 31; The shaft body I 111 of the hollow guide shaft 1 is provided with a plurality of radial clamping grooves 110 corresponding to a plurality of clamping blocks 6; The inner end of the plurality of clamping blocks 6 is clamped with the plurality of radial clamping grooves 110 corresponding thereto; The sun gear 7 is installed in the planet carrier body 30 and its inner hole surrounds the shaft body III 113 of the hollow guide shaft 1. In this way, after the lubricating oil lubricates the meshing point of the sun gear 7, it will be blocked and guided by the axial guide ring-shaped protrusion 32 when flowing through the planet carrier 3, and cannot directly flow to the position of the two radial O-shaped sealing rings 5 installed with a gap between the outer periphery of the shaft body II 112 of the guide shaft 1 and the inner periphery of the planet carrier connection part 31. Therefore, after long-term use, wear and aging of the two radial O-shaped sealing rings 5, the lubricating oil will not flow to the clamping position of the inner end of the plurality of clamping blocks 6 and the plurality of radial clamping grooves 110 corresponding to the plurality of clamping blocks 6, and will not enter the hollow guide shaft 1 through the gap at the clamping position of the plurality of radial clamping grooves 110, drip on the fan variable pitch control line cable in the hollow guide shaft 1, and flow to the connection position of the right end of the hollow guide shaft 1 and the motor slip ring through the outer periphery of the fan variable pitch control line cable. Therefore, it will not cause lubricating oil leakage and environmental pollution, and will not cause short circuit and burnout of the motor; The sealing performance and safety are good, and the radial O-shaped sealing ring 5 does not need to be replaced, and the maintenance cost is low.

[0024] Referring to Figure 2 As shown, the axial section of the axial guide ring-shaped protrusion 32 is preferably tapered with a wider left and a narrower right. This makes the axial guide ring-shaped protrusion 32 have better guiding and flowing effect. When the lubricating oil flows through the meshing part of the sun gear 7, it will flow faster to the axial guide ring-shaped protrusion 32 under the action of gravity, and be guided to the shaft body III 113 of the hollow guide shaft 1 by the axial guide ring-shaped protrusion 32, and finally flow into the gear box under the action of gravity. Thus, the lubricating oil will not flow to the position of the two radial O-shaped sealing rings 5, and will not flow to the clamping position of the inner end of the plurality of clamping blocks 6 and the plurality of radial clamping grooves 110 corresponding thereto, and will not enter the hollow guide shaft 1 through the gap at the clamping position of the plurality of radial clamping grooves 110, drip on the fan variable pitch control line cable in the hollow guide shaft 1 and flow to the connection position of the right end of the hollow guide shaft 1 and the motor slip ring through the outer periphery of the fan variable pitch control line cable. Therefore, it will not cause lubricating oil leakage and environmental pollution, and will not cause short circuit and burnout of the motor; The sealing performance and safety are better.

[0025] The axial width of the planet carrier connecting portion 31 of the planet carrier 3 near the portion of the shaft body II 112 of the hollow guide shaft 1 is preferably less than the axial width of the shaft body II 112. This makes the width of the planet carrier connecting portion 31 not only able to form a micro-gap between the planet carrier connecting portion 31 and the shaft body II 112 of the hollow guide shaft 1 for installing two radial O-shaped sealing rings 5, but also able to reduce the weight and energy consumption.

[0026] As shown in Figure 2 As shown in the drawings, the outer periphery of the shaft body III 113 of the hollow guide shaft 1 is preferably provided with an annular groove 130, one end of which is located near the left side below the right end of the axial guide annular protrusion 32, and the other end is located at the right side away from the right end below the axial guide annular protrusion 32. This makes the lubricating oil flowing through the meshing portion of the sun gear 7 flow faster under the action of gravity to the axial guide annular protrusion 32, and then be guided by the axial guide annular protrusion 32 into the annular groove 130 on the shaft body III 113 of the hollow guide shaft 1, and then flow faster into the gear box under the action of gravity, better avoiding the lubricating oil flowing to the left to the position of the two radial O-shaped sealing rings 5, and then flowing to the clamping position of the inner end of the plurality of clamping blocks 6 and the plurality of corresponding radial clamping grooves 110, and then entering the hollow guide shaft 1 through the gap at the clamping position of the plurality of radial clamping grooves 110, and then dripping on the fan pitch control cable in the hollow guide shaft 1 and flowing to the connection position of the right end of the hollow guide shaft 1 and the motor slip ring through the outer periphery of the fan pitch control cable. Thus, it will not cause lubricating oil leakage to pollute the environment, and will not cause short circuit and burn the motor; better sealing and safety.

[0027] As shown in Figure 2 As shown in the drawings, the outer periphery of the shaft body III 113 of the hollow guide shaft 1 is preferably provided with an annular groove 130, one end of which is located near the left side below the right end of the axial guide annular protrusion 32, and the other end is located at the right side away from the right end below the axial guide annular protrusion 32. This makes the lubricating oil flowing through the meshing portion of the sun gear 7 flow faster under the action of gravity to the axial guide annular protrusion 32, and then be guided by the axial guide annular protrusion 32 into the annular groove 130 on the shaft body III 113 of the hollow guide shaft 1, and then flow faster into the gear box under the action of gravity, better sealing and safety.

[0028] As shown in Figure 2 As shown in the drawings, each of the plurality of clamping blocks 6 includes a connecting portion 60 and a clamping portion 61 extending radially inward from the connecting portion 60, the axial dimension of the clamping portion 61 being smaller than the axial dimension of the connecting portion 60, and the clamping portion 61 of each of the plurality of clamping blocks 6 is clamped with one of the plurality of radial clamping grooves 110 on the shaft body I of the hollow guide shaft. This makes the clamping block 6 not only better clamped with the clamping groove 110, but also has better use strength.

[0029] The preferred embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A sealing structure for the left end of a wind turbine gearbox guide shaft, characterized in that, It includes a hollow guide shaft 1 comprising shaft I, shaft II and shaft III connected sequentially from left to right with gradually increasing outer diameter, a planetary carrier comprising a planetary carrier body and a planetary carrier connecting part extending radially inward from the planetary carrier body, two radial O-ring seals, several locking blocks and a sun gear. The hollow guide shaft passes through the left and right ends of the wind turbine gearbox, and the wind turbine pitch control cable passes through the hollow guide shaft and is connected to the motor slip ring at the right end of the hollow guide shaft. The planet carrier connecting part extends radially inward and its inner wall is opposite to the outer periphery of the hollow guide shaft II with a slight gap. The right end of the planet carrier connecting part is provided with an axially extending rightward guide ring protrusion near the outer periphery of the hollow guide shaft II into the inner hole of the sun gear. The axial cross section of the axially extending guide ring protrusion is a cone shape that is wider on the left and narrower on the right. The two radial O-ring seals are installed at a distance between the outer circumference of the shaft body II of the guide shaft and the inner circumference of the planetary carrier connection. The hollow guide shaft I has a plurality of radial slots that extend through the inside and outside and correspond to a plurality of locking blocks; the inner ends of the plurality of locking blocks engage with the corresponding plurality of radial slots. The sun gear is mounted in the planetary carrier and its inner hole surrounds the hollow guide shaft III. The outer periphery of the hollow guide shaft III is provided with an annular groove. One end of the annular groove is located near the left side below the right end of the axial guide annular protrusion, and the other end is located on the right side away from the right end below the axial guide annular protrusion.

2. The sealing structure at the left end of the wind turbine gearbox guide shaft as described in claim 1, characterized in that, The axial width of the portion of the planetary carrier connecting part near the hollow guide shaft II is smaller than the axial width of the shaft II.

3. The sealing structure at the left end of the wind turbine gearbox guide shaft as described in claim 1, characterized in that, The annular groove on the outer periphery of the hollow guide shaft III has an inclined structure at both ends.

4. The sealing structure at the left end of the wind turbine gearbox guide shaft as described in claim 3, characterized in that, Each of the plurality of locking blocks includes a connecting portion and a locking portion extending radially inward from the connecting portion with an axial dimension smaller than that of the connecting portion. The locking portion of each of the plurality of locking blocks engages with one of the radial slots corresponding to the shaft body I of the hollow guide shaft.

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