Wind power gear box

Abstract

The utility model relates to a wind power gear box (100). The wind power gear box (100) comprises a hollow shaft (1) serving as an output shaft of the wind power gear box; the threading pipe (2) is arranged in the hollow shaft, the threading pipe is rotatably supported relative to the hollow shaft through a threading pipe bearing (3), and the threading pipe bearing is arranged on the side, close to a generator, of the threading pipe; the sealing end cover (4) is arranged on one side, close to the generator, of the threading pipe bearing and seals the threading pipe bearing; and the sealing element (5) is close to the threading pipe bearing, is arranged on one side, opposite to the generator, of the threading pipe bearing, and is positioned between the hollow shaft and the threading pipe so as to prevent lubricating oil in the threading pipe from flowing to the threading pipe bearing. According to the utility model, the sealing element is arranged at one side, far away from the generator, of the threading pipe bearing, so that lubricating oil in the hollow shaft can be prevented from flowing to the threading pipe bearing and leaking to the generator.

Description

Technical Field

[0001] The utility model relates to a wind power gear box, in particular to a threading tube structure in the wind power gear box. Background Art

[0002] In wind power generation technology, wind drives the rotor blades to rotate and convert wind energy into rotational mechanical energy. The wind turbine gearbox increases the rotation speed and transmits it to the generator to convert it into electrical energy. The rotor blades are controlled by the pitch control system. The communication and power lines of the pitch control system are usually set in the threading tube, which passes through the wind turbine gearbox to the generator. Since a threading tube is inserted between the wind turbine gearbox and the generator, a sealing structure needs to be set at the threading tube to prevent the lubricating oil in the wind turbine gearbox from leaking into the generator.

[0003] At present, in order to prevent the lubricating oil from leaking into the generator, the shaft seal is usually installed on the generator side of the threading tube bearing to play the role of the last seal. However, when the threading tube bearing seal weakens or fails, some lubricating oil will flow to the shaft seal. When the oil pressure inside the shaft seal is too high or the temperature is too high / too low, the shaft seal will leak oil.

[0004] In addition, the traditional threading tube and planetary carrier locking structure only relies on two bolts and one block. During frequent starting and braking, the fatigue life of the bolts and the block is greatly shortened, causing the locking function to fail.

[0005] Therefore, it is necessary to design an improved threading tube structure to solve one or more of the above technical defects. Utility Model Content

[0006] In order to overcome at least one defect of the prior art, the utility model provides a wind power gear box with improved threading tube sealing.

[0007] According to one aspect of the utility model, a wind turbine gearbox is provided, the wind turbine gearbox comprising:

[0008] A hollow shaft used as an output shaft of the wind power gearbox;

[0009] A threading tube is arranged in the hollow shaft, the threading tube is rotatably supported relative to the hollow shaft through a threading tube bearing, and the threading tube bearing is arranged on a side of the threading tube close to the generator;

[0010] A sealing end cover, which is disposed on a side of the threading tube bearing close to the generator and seals the threading tube bearing; and

[0011] A sealing member is arranged close to the threading tube bearing on a side of the threading tube bearing opposite to the generator and is located between the hollow shaft and the threading tube to prevent lubricating oil in the threading tube from flowing to the threading tube bearing.

[0012] According to one embodiment, the threading tube bearing is fixed between the hollow shaft and the threading tube by a bearing sleeve, the bearing sleeve is radially located between the threading tube bearing and the hollow shaft, the bearing sleeve has an annular body extending axially and a stopper extending radially inward from one axial end of the annular body, the stopper is located on the side of the threading tube bearing opposite to the generator to axially stop the threading tube bearing, and the seal is arranged between the stopper and the threading tube.

[0013] According to one embodiment, one or more sealing rings are provided between the stop portion of the bearing sleeve and the abutment surface of the hollow shaft and between the radial outer surface of the bearing sleeve and the radial inner surface of the hollow shaft to prevent lubricating oil from leaking to the sealing end cover.

[0014] According to one embodiment, the seal is a lip seal.

[0015] According to one embodiment, the sealing end cover has a plate-like body and an annular protrusion extending axially to the threading tube bearing at a position radially inward from the outer periphery of the plate-like body, an oil return chamber is formed between the annular protrusion and the threading tube, and a drainage portion is formed on the surface of the plate-like body facing the threading tube bearing in the oil return chamber, and the drainage portion is located radially inward from the annular protrusion.

[0016] According to one embodiment, the guide portion is formed in a step shape, and a radial inner surface of the guide portion extends obliquely relative to an axial direction of the sealing end cover.

[0017] According to one embodiment, an inclination angle between the radial inner surface and the axial direction of the sealing end cover is greater than or equal to an installation inclination angle of the hollow shaft when the wind turbine gearbox is in an installed and operating state.

[0018] According to one embodiment, the sealing end cover has at least one of the following features:

[0019] An oil return hole is provided on the annular protruding portion and / or the plate-shaped body, and the oil return hole is connected to the oil pool of the wind power gear box;

[0020] The plate-shaped body has a central hole, the threading tube extends through the central hole, and a support portion for supporting the threading tube extends axially from the central hole toward the threading tube bearing;

[0021] A concave cavity is formed on a surface of the plate-like body facing the threading tube bearing, and the concave cavity is continuous with the drainage portion;

[0022] The outer peripheral portion of the plate-like body forms a clearance fit with the hollow shaft in the radial direction;

[0023] One or more sealing rings are arranged between the annular protrusion and the bearing sleeve of the threading tube bearing.

[0024] According to one embodiment, the wire threading tube is fixed in the wind turbine gearbox through a mounting structure at the opposite end away from the generator, and the mounting structure includes an annular stop baffle, and the stop baffle includes a mounting hole, and the opposite end of the wire threading tube is fitted in the mounting hole, and the stop baffle is fixed in the wind turbine gearbox by a plurality of fasteners distributed around the wire threading tube.

[0025] According to one embodiment, the threading tube has a plurality of mating surfaces along its circumference that are mating with the mounting hole, and the plurality of mating surfaces are evenly distributed along the circumference to form a non-circular shape-locking connection with the mounting hole.

[0026] According to the utility model, the wind turbine gearbox can prevent the lubricating oil in the hollow shaft from flowing to the threading tube bearing by arranging a seal on the side of the threading tube bearing away from the generator, thereby preventing the lubricating oil from further leaking outward from the sealing end cover to the generator due to failure of the threading tube bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Specific details of various embodiments of the present invention are described in the accompanying drawings and the following description. Other features and advantages of the present invention will be apparent from these descriptions and drawings.

[0028] Figure 1 It is a schematic partial cross-sectional view of a wind turbine gearbox according to an embodiment of the utility model.

[0029] Figure 2 It is shown Figure 1 The schematic diagram of the wire tube installation structure in the wind turbine gearbox is shown.

[0030] Figure 3 yes Figure 2 A front view of the conduit installation structure is shown. DETAILED DESCRIPTION

[0031] The specific embodiments and modifications of the present utility model will be described in detail below with reference to the accompanying drawings.

[0032] For the convenience of description, spatial relative terms such as "inside", "outside", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "horizontal", "vertical" etc. are used in this article to define various components and their connection relationships, but this is not intended to be limiting. When the placement of the components changes, these spatial relative relationships can also be reversed or changed without affecting the protection scope of the present invention.

[0033] Figure 1 It is a schematic partial cross-sectional view of a wind turbine gearbox 100 according to an embodiment of the utility model.

[0034] like Figure 1 As shown, the wind turbine gearbox 100 includes an output shaft for transmitting rotational kinetic energy to a generator rotor (not shown in the figure). The output shaft is formed as a hollow shaft 1 and a threading tube 2 is arranged inside the hollow shaft 1. The threading tube 2 is rotatably supported by a threading tube bearing 3 at one end close to the generator. On the axial side of the threading tube bearing 3 close to the generator (i.e., the axial outer side, Figure 1 A sealing end cover 4 is provided on the right side of the hollow shaft 1, and a sealing member 5 is provided on the other axial side of the threading tube bearing 3 opposite to the generator (i.e., the axial inner side). The sealing member 5 is provided close to the threading tube bearing 3 to prevent the lubricating oil in the hollow shaft 1 from flowing to the threading tube bearing 3 and then leaking to the outside of the sealing end cover 4 and entering the generator. In addition, the sealing member 5 can be provided on the axial outer side of the oil return channel 7 directly connected to the cavity 6 of the hollow shaft 1 (i.e., closer to the oil return channel 7 than the oil return channel 7). Figure 1 on the right side of the image).

[0035] The threading tube bearing 3 can be arranged between the threading tube 2 and the hollow shaft 1 through the bearing sleeve 8 to rotatably support the threading tube 2 relative to the hollow shaft 1. The bearing sleeve 8 can be fixed to the hollow shaft 1 by fasteners such as bolts (not shown in the figure). The threading tube bearing 3 can be axially positioned by the bearing sleeve 8 on the side away from the sealing end cover 4 (i.e., the axial inner side), and can be axially positioned by the sealing end cover 4 on the side close to the sealing end cover 4 (i.e., the axial outer side). However, depending on the size of the radial space between the threading tube 2 and the hollow shaft 1, the threading tube bearing 3 can also be directly arranged between the threading tube 2 and the hollow shaft 1 and the bearing sleeve 8 is omitted. In this case, the threading tube bearing 3 can, for example, directly axially abut against the hollow shaft 1 and the sealing end cover 4 to achieve axial positioning.

[0036] The threading tube bearing 3 can be a bearing with a grease seal. Figure 1The seal 5 on the left side of the threading tube bearing 3 is aged or fails or due to other reasons, causing a very small amount of lubricating oil to flow axially outward to the threading tube bearing 3. The threading tube bearing 3 can also prevent the lubricating oil from flowing further axially outward, thereby acting as a secondary seal and playing a certain sealing role. The threading tube bearing 3 can be a cylindrical roller bearing or any other suitable type of bearing.

[0037] Continue to refer Figure 1 The bearing sleeve 8 may include an annular body 81 and an annular stopper 82 extending radially inward at one axial end of the annular body 81. The annular stopper 82 is formed as an annular shape extending along the entire circumference, and its local longitudinal section is roughly formed into an L shape. The annular body 81 extends axially on the radial inner side of the hollow shaft 1 and is radially abutted between the threading tube bearing 3 and the hollow shaft 1 to radially support the threading tube bearing 3. The annular stopper 82 is axially located between the axial inner surface of the threading tube bearing 3 and the axial abutment surface of the hollow shaft 1, and axially abuts against the threading tube bearing 3 and the hollow shaft 1 to position the threading tube bearing 3 on the axial inner side, prevent the threading tube bearing 3 from moving axially inward, and block the lubricating oil in the hollow shaft 1 from flowing to the threading tube bearing 3. The other axial end of the annular body 81 can abut against the sealing end cover 4 to achieve axial positioning.

[0038] In order to prevent the lubricating oil from leaking to the sealing end cover 4 through the gap between the bearing sleeve 8 and the hollow shaft 1, one or more first sealing rings 9 such as O-rings may be provided between the axial inner surface of the annular stopper 82 and the axial abutment surface of the hollow shaft 1, and one or more second sealing rings 10 such as O-rings may also be provided between the radial outer surface of the annular body 81 and the radial inner surface of the hollow shaft 1. In other words, one or more sealing rings may be provided between the surfaces of the bearing sleeve 8 and the hollow shaft 1 that contact each other to prevent the lubricating oil from leaking therefrom.

[0039] The annular stopper 82 of the bearing sleeve 8 can also be used as a mounting portion of the seal 5. The seal 5 is arranged between the radial inner surface of the annular stopper 82 and the threading tube 2, so as to prevent the lubricating oil in the hollow shaft 1 from flowing to the threading tube bearing 3 through the seal 5. The seal 5 is preferably a lip seal 5, such as a skeleton seal, a V-shaped seal ring or other forms, and its opening is preferably facing the axial inner side, so as to achieve dynamic sealing between the threading tube 2 and the hollow shaft 1 when they rotate relative to each other. In addition, since the seal 5 is a consumable part and its service life is usually 2-3 years, it needs to be replaced regularly. Since the annular stopper 82 is arranged on the axial inner side of the threading tube bearing 3, it is not necessary to disassemble the bearing sleeve 8 when replacing the seal 5, which greatly simplifies the maintenance operation.

[0040] Although the seal 5 is described above as being disposed between the threading tube 2 and the annular stop portion 82 of the bearing sleeve 8, it is conceivable that the seal 5 may also be disposed directly between the threading tube 2 and the hollow shaft 1 as long as the lubricating oil can be prevented from flowing to the threading tube bearing 3.

[0041] The sealing end cover 4 is arranged on the axial outer side of the threading tube bearing 3 and can be located in the hollow shaft 1 to achieve sealing and positioning of the threading tube bearing 3 and the bearing sleeve 8 at the axial outer side.

[0042] The sealing end cover 4 has a plate-like body 41, which is provided with a central hole 411 for the threading tube 2 to pass through, and the outer peripheral portion 412 of the plate-like body 41 is arranged to abut against the bearing sleeve 8 axially, and preferably forms a clearance fit with the hollow shaft 1 in the radial direction. At a position radially inward from the outer peripheral portion 412 of the plate-like body 41, an annular extension portion 42 extends axially inward from the side of the plate-like body 41 close to the threading tube bearing 3. The annular extension portion 42 abuts against the threading tube bearing 3 in the axial direction, abuts against the bearing sleeve 8 on the radial outer side, and is radially spaced from the threading tube 2 on the radial inner side to form an oil return chamber 40. In order to prevent the lubricating oil from the threading tube bearing 3 from leaking outward without returning the oil in the oil return chamber 40 in the sealing end cover 4, a third sealing ring 13 such as an O-ring is arranged between the annular extension portion 42 of the sealing end cover 4 and the contact surface of the bearing sleeve 8.

[0043] In the oil return chamber 40 of the sealing end cover 4, a flow guide 43 is provided which is located radially inside the annular protrusion 42. The flow guide 43 is formed, for example, as a step protruding radially inward from the annular protrusion 42. The radial inner surface 44 of the flow guide 43 can be formed as a flat surface or a curved surface, which extends radially outwardly and close to the annular protrusion 42 relative to the axial direction of the sealing end cover 4. An inclination angle is formed between the radial inner surface 44 of the flow guide 43 (the tangent direction is taken when the radial inner surface 44 is a curved surface) and the axial direction of the sealing end cover 4, and the inclination angle is preferably equal to or greater than the installation inclination angle of the wind power gearbox 100 (the inclination angle of the axis A of the hollow shaft 1 relative to the horizontal direction), thereby, in the installed and operating state of the wind power gearbox 100, the flow guide 43 can make the lubricating oil in the oil return chamber 40 flow smoothly downward along the flow guide 43, so that the lubricating oil can flow from the oil return chamber 40 to the gearbox oil pool (not shown in the figure) via the oil return hole 45. The oil return hole 45 can be provided on the annular protruding portion 42 or the plate-like body 41 or both (for example, at the junction of the annular protruding portion 42 and the plate-like body 41 ), and is located radially outside the guide portion 43 .

[0044] The drainage portion 43 may be formed to be continuous with the axial inner surface of the plate-like body 41 facing the threading tube bearing 3. The axial inner surface may be formed in a flat shape, or may be further formed with a concave cavity 46, which is continuous with the drainage portion 43, such as Figure 1 The concave cavity 46 can increase the volume of the oil return cavity 40 and reduce the material used for the sealing end cover 4.

[0045] The sealing end cover 4 can be provided with an annular support portion 47 at the central part of its plate-like body 41 (for example, at the center hole 411), and the support portion 47 extends axially from the radial inner side of the plate-like body 41 toward the threading tube bearing 3. The support portion 47 is arranged around the threading tube 2 to support the threading tube 2.

[0046] Figure 2 The mounting structure 21 of the end of the threading tube 2 at the side away from the generator is shown. At the side away from the generator, the threading tube 2 is usually fixedly mounted to the planet carrier (not shown in the figure), but can also be mounted to other rotating structures in the gearbox.

[0047] The mounting structure 21 includes an annular stop baffle 210, and the end of the threading tube 2 is fixed in the mounting hole 211 of the stop baffle 210 by, for example, interference fit, snap fit, thread fit, welding, etc. Preferably, the end of the threading tube 2 is fixed in the mounting hole 211 of the stop baffle 210 by a non-circular shape lock to prevent the threading tube 2 from rotating relative to the stop baffle 210. For example, the threading tube 2 is provided with a plurality of evenly distributed flat mating surfaces (such as Figure 3 The four flat mating surfaces 212 shown in the figure, or the cross-section of the threading tube 2 has a polygonal shape, so that the outer surface of the threading tube 2 is formed with multiple mating surfaces that cooperate with the stop baffle 210, and the contact area between each mating surface and the mounting hole 211 of the stop baffle 210 and the number of mating surfaces can be set according to factors such as the strength or force conditions of the threading tube 2.

[0048] The stop baffle 210 is fixed in the gear box by a plurality of fasteners 213, such as threaded fasteners (such as bolts). These fasteners 213 are distributed around the threading tube 2, for example, evenly distributed along the circumference, or centrally symmetrically distributed such as vertically or horizontally symmetrically distributed, or distributed in a certain other regular pattern, so that the force on the fasteners 213 is more uniform and reduced.

[0049] By using the above-mentioned installation structure 21, the threading tube 2 is fixed more firmly, effectively and evenly on the side far away from the generator, which can extend the service life.

[0050] In each embodiment of the utility model, the seal 5 is located on the side of the threading tube bearing 3 away from the generator, and can be in direct contact with the lubricating oil. While preventing the lubricating oil from leaking into the threading tube bearing 3, it can slow down the aging of the seal 5 itself, extend the service life, and reduce the cost of replacing the seal 5 in the short term.

[0051] In addition, the annular stopper 82 of the bearing sleeve 8 for mounting the seal 5 is located axially inside the threading tube bearing 3, so that the bearing sleeve 8 does not need to be disassembled when replacing the seal 5, thereby simplifying the maintenance operation.

[0052] Furthermore, the end of the threading tube 2 away from the generator adopts a mounting structure 21 with more uniform force, which can extend the service life.

[0053] The specific embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above specific structures, but covers various modifications and equivalent features. Those skilled in the art can make various changes without departing from the scope of protection of the present invention.

Claims

1. A wind power gearbox (100), characterized in that: The wind power gearbox (100) comprises: A hollow shaft (1) used as an output shaft of the wind power gearbox (100); A threading tube (2) is arranged in the hollow shaft (1), the threading tube (2) is rotatably supported relative to the hollow shaft (1) via a threading tube bearing (3), and the threading tube bearing (3) is arranged on a side of the threading tube (2) close to the generator; A sealing end cover (4) is arranged on a side of the threading tube bearing (3) close to the generator and seals the threading tube bearing (3); and A seal (5) is arranged close to the threading tube bearing (3) on the side of the threading tube bearing (3) opposite to the generator and is located between the hollow shaft (1) and the threading tube (2) to prevent lubricating oil in the threading tube (2) from flowing into the threading tube bearing (3).

2. The wind turbine gearbox (100) according to claim 1, characterized in that: The threading tube bearing (3) is fixed between the hollow shaft (1) and the threading tube (2) through a bearing sleeve (8); the bearing sleeve (8) is radially located between the threading tube bearing (3) and the hollow shaft (1); the bearing sleeve (8) has an annular body (81) extending in the axial direction and a stopper (82) extending radially inward from one axial end of the annular body (81); the stopper (82) is located on the side of the threading tube bearing (3) opposite to the generator to axially stop the threading tube bearing (3); and the sealing member (5) is arranged between the stopper (82) and the threading tube (2).

3. The wind turbine gearbox (100) according to claim 2, characterized in that: One or more sealing rings are respectively provided between the stop portion (82) of the bearing sleeve (8) and the abutment surface of the hollow shaft (1), and between the radial outer surface of the bearing sleeve (8) and the radial inner surface of the hollow shaft (1) to prevent lubricating oil from leaking to the sealing end cover (4).

4. The wind turbine gearbox (100) according to claim 1, characterized in that: The seal (5) is a lip seal (5).

5. The wind turbine gearbox (100) according to claim 1, characterized in that: The sealing end cover (4) comprises a plate-like main body (41) and an annular protrusion (42) extending axially from an outer peripheral portion (412) of the plate-like main body (41) to the threading tube bearing (3), an oil return chamber (40) is formed between the annular protrusion (42) and the threading tube (2), a drainage portion (43) is formed on a surface of the plate-like main body (41) facing the threading tube bearing (3) in the oil return chamber (40), and the drainage portion (43) is located radially inward from the annular protrusion (42).

6. The wind turbine gearbox (100) according to claim 5, characterized in that: The guide portion (43) is formed in a step shape, and a radial inner surface (44) of the guide portion (43) extends obliquely relative to the axial direction of the sealing end cover (4).

7. The wind turbine gearbox (100) according to claim 6, characterized in that: The inclination angle between the radial inner surface (44) and the axial direction of the sealing end cover (4) is greater than or equal to the installation inclination angle of the hollow shaft (1) when the wind power gearbox (100) is in an installed and operating state.

8. The wind turbine gearbox (100) according to claim 6, characterized in that: The sealing end cover (4) has at least one of the following features: An oil return hole (45) is provided on the annular protruding portion (42) and / or the plate-shaped body (41), and the oil return hole (45) is connected to the oil pool of the wind power gear box (100); The plate-shaped body (41) has a central hole (411), the threading tube (2) extends through the central hole (411), and a support portion (47) for supporting the threading tube (2) extends axially from the central hole (411) toward the threading tube bearing (3); A concave cavity (46) is formed on the surface of the plate-like body (41) facing the threading tube bearing (3), and the concave cavity (46) is continuous with the drainage portion (43); The outer peripheral portion (412) of the plate-like body (41) forms a clearance fit with the hollow shaft (1) in the radial direction; One or more sealing rings are provided between the annular protruding portion (42) and the bearing sleeve (8) of the threading tube bearing (3).

9. The wind turbine gearbox (100) according to any one of claims 1 to 8, characterized in that: The wire threading tube (2) is fixed in the wind turbine gear box (100) at the opposite end away from the generator through a mounting structure (21); the mounting structure (21) includes an annular stop baffle (210); the stop baffle (210) includes a mounting hole (211); the opposite end of the wire threading tube (2) fits in the mounting hole (211); the stop baffle (210) is fixed in the wind turbine gear box (100) through a plurality of fasteners (213) distributed around the wire threading tube (2).

10. The wind turbine gearbox (100) according to claim 9, characterized in that: The threading tube (2) has a plurality of matching surfaces (212) matching with the mounting hole (211) along its circumference, and the plurality of matching surfaces (212) are evenly distributed along the circumference to form a non-circular shape-locking connection with the mounting hole (211).

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