Wind power gear box

Abstract

The utility model belongs to the technical field of wind power generation, and discloses a wind power gear box which comprises a box body and a rotating shaft rotationally connected to the box body, and the rotating shaft can rotate at a high speed relative to the box body, so that high-pressure oil mist is generated in the box body. The sealing cover assembly is arranged on the box body, the rotating shaft is provided with an extending part, the extending part is arranged outside the box body, and a dissipation channel is formed between the sealing cover assembly and the extending part. The sealing cover assembly, the extending part and the first wind shielding piece jointly define the buffering cavity, the buffering cavity communicates with the outlet end of the dissipation channel, so that oil mist is temporarily stored in the buffering cavity firstly after coming out of the dissipation channel, sudden change of the oil mist and air pressure can be slowed down, and the oil mist is prevented from being directly discharged out of the box body. A pressure reducing channel is formed between the first air blocking piece and the extending part, the first air blocking piece is provided with flow dividing holes, and the buffering cavity communicates with the outside through the pressure reducing channel and the flow dividing holes. Through the arrangement, the wind power gear box can reduce leakage of oil mist, and operation is safer.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, and in particular to a wind turbine gearbox. Background Technology

[0002] The wind turbine gearbox is one of the key mechanical components used in wind turbine generator sets. It is mainly used to convert the rotational motion of the wind turbine into the low-speed, high-torque motion required by the high-speed rotation of the generator.

[0003] In existing wind turbine gearboxes, the rapid rotation of the high-speed shaft causes a rapid increase in oil temperature within the sealing cavity, resulting in dense oil mist and a continuous increase in air pressure within the sealing cavity, which easily leads to oil mist spraying and leakage. Furthermore, a brake disc is mounted on the high-speed shaft, with external teeth on its outer side for cranking, protected by a cover. When the brake disc rotates at high speed, the external teeth generate negative pressure inside the cover. Because the brake disc is close to the labyrinth seal on the high-speed shaft, it draws oil mist from the sealing cavity through the labyrinth seal gaps, causing oil leakage. This not only pollutes the nacelle environment but also poses many potential hazards, affecting the normal and safe operation of the wind turbine. Utility Model Content

[0004] The purpose of this invention is to provide a wind turbine gearbox that can reduce oil mist leakage and make operation safer.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A wind turbine gearbox includes a housing and a rotating shaft rotatably connected to the housing. The wind turbine gearbox further includes:

[0007] A sealing assembly is disposed on the housing. The rotating shaft has a protrusion. The protrusion is located outside the housing. The sealing assembly is sleeved on the protrusion and forms an escaping channel with the protrusion. The interior of the housing is connected to the outside through the escaping channel.

[0008] A first windbreak is fitted onto the protrusion and connected to the cover assembly, and has a diversion hole. A pressure-reducing channel is formed between the first windbreak and the protrusion. The cover assembly, the protrusion, and the first windbreak together form a buffer cavity. The buffer cavity is connected to the outlet end of the escaping channel and is connected to the outside through the pressure-reducing channel and the diversion hole.

[0009] Optionally, the diversion hole extends through the first windbreak member in the radial direction of the rotating shaft.

[0010] Optionally, the first windshield includes an extension that extends toward the pivot and forms the pressure relief channel with the pivot.

[0011] Optionally, the gap between the extension and the rotating shaft is 1 to 10 mm.

[0012] Optionally, the cover assembly has a stepped portion, and the first windproof component is fitted onto the stepped portion.

[0013] Optionally, the wind turbine gearbox further includes a second windbreak component, which is disposed on the first windbreak component and has a wind-blocking portion, which is disposed opposite to the diversion hole.

[0014] Optionally, a turbulence cavity communicating with the outside is formed between the windbreak portion and the first windbreak member, and the buffer cavity is connected to the turbulence cavity through the diversion hole.

[0015] Optionally, the second wind deflector has a through hole coaxially arranged with the diversion hole.

[0016] Optionally, the sealing assembly includes a first cover and a second cover, the housing, the first cover and the second cover are connected sequentially along the extension direction of the rotating shaft, and the first windproof element is disposed on the second cover.

[0017] Optionally, a receiving cavity is formed between the rotating shaft, the second cover, and the housing. The first cover divides the receiving cavity into two oil return chambers. The rotating shaft is provided with two oil slinger rings, and the two oil slinger rings are arranged in a one-to-one correspondence with the two oil return chambers.

[0018] The beneficial effects of this utility model are:

[0019] This utility model provides a wind turbine gearbox, which includes a housing and a rotating shaft rotatably connected to the housing. The rotating shaft can rotate at high speed relative to the housing, causing high-pressure oil mist to be generated inside the housing. The wind turbine gearbox also includes a cover assembly and a first windbreak component. The cover assembly is disposed on the housing, and the rotating shaft has an extension portion that is located outside the housing. The cover assembly is fitted onto the extension portion, forming an escape channel between the cover assembly and the extension portion, allowing the oil mist inside the housing to leak to the outside of the housing through the escape channel, preventing excessive air pressure inside the housing from causing danger. The cover assembly, the extension portion, and the first windbreak component together form a buffer chamber, which is connected to the outlet end of the escape channel. This allows the oil mist to be temporarily stored in the buffer chamber after exiting through the escape channel, which can slow down the sudden changes in oil mist and air pressure, preventing the oil mist from being directly discharged to the outside of the housing. A pressure-reducing channel is formed between the first windshield and the protrusion. The first windshield has a diversion hole. The buffer chamber is connected to the outside through the pressure-reducing channel and the diversion hole. This design can both release the air pressure inside the gearbox and divert the oil mist in the buffer chamber, reducing the suction force of the oil mist caused by the negative pressure generated by the high-speed rotation of the external gear. With the above design, the wind turbine gearbox of this application can reduce oil mist leakage and make operation safer. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the wind turbine gearbox provided in an embodiment of this utility model;

[0021] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0022] Figure 3 yes Figure 1 A magnified view of a section at point B.

[0023] In the picture:

[0024] 100. Housing; 200. Shaft; 201. Extension; 202. Escape channel; 203. Oil slinger ring; 1. Cover assembly; 11. Stepped section; 12. First cover; 13. Second cover; 131. Receiving cavity; 1311. Oil return cavity; 2. First windbreak; 21. Diverter hole; 22. Pressure relief channel; 23. Buffer cavity; 24. Extension; 3. Second windbreak; 31. Windbreak section; 32. Turbulence cavity; 33. Through hole. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] like Figures 1-3 As shown, this embodiment provides a wind turbine gearbox, which includes a housing 100 and a rotating shaft 200 rotatably connected to the housing 100. The wind turbine gearbox also includes a cover assembly 1 and a first windbreak component 2. The cover assembly 1 is disposed on the housing 100. The rotating shaft 200 has an extension 201, which is located outside the housing 100. The cover assembly 1 is sleeved on the extension 201 and forms an escaping channel 202 between the cover assembly 1 and the extension 201. The interior of the housing 100 is connected to the exterior through the escaping channel 202. The first windbreak component 2 is sleeved on the extension 201 and connected to the cover assembly 1, and has a diversion hole 21. A pressure-reducing channel 22 is formed between the first windbreak component 2 and the extension 201. The cover assembly 1, the extension 201, and the first windbreak component 2 together form a buffer cavity 23. The buffer cavity 23 is connected to the outlet end of the escaping channel 202 and is connected to the exterior through the pressure-reducing channel 22 and the diversion hole 21.

[0030] In this embodiment, the wind turbine gearbox includes a cover assembly 1 and a first windbreak component 2. The cover assembly 1 is disposed on the housing 100, and the rotating shaft 200 has an extension 201. The extension 201 is located outside the housing 100. The cover assembly 1 is sleeved on the extension 201, and an escaping channel 202 is formed between the cover assembly 1 and the extension 201. This allows oil mist inside the housing 100 to leak to the outside of the housing 100 through the escaping channel 202, preventing excessive air pressure inside the housing 100 from causing danger. The cover assembly 1, the extension 201, and the first windbreak component 2 together form a buffer cavity 23. The buffer cavity 23 is connected to the outlet end of the escaping channel 202, so that after the oil mist comes out through the escaping channel 202, it will first be temporarily stored in the buffer cavity 23, which can slow down the sudden change of oil mist and air pressure and prevent the oil mist from being directly discharged to the outside of the housing 100. A pressure-reducing channel 22 is formed between the first windbreak component 2 and the protrusion 201. The first windbreak component 2 has a diversion hole 21. The buffer chamber 23 is connected to the outside through the pressure-reducing channel 22 and the diversion hole 21. This arrangement can both release the air pressure inside the housing 100 and divert the oil mist in the buffer chamber 23, reducing the suction force of the oil mist caused by the negative pressure generated by the high-speed operation of the external gear. Through the above arrangement, the wind turbine gearbox of this application can reduce oil mist leakage and make operation safer.

[0031] The specific structure of the wind turbine gearbox is described below:

[0032] Specifically, such as Figures 1-3 As shown, the sealing assembly 1 includes a first cover 12 and a second cover 13. The housing 100, the first cover 12, and the second cover 13 are connected sequentially along the extension direction of the rotating shaft 200, making the structure of the entire sealing assembly 1 more compact. The first windbreak 2 is disposed on the second cover 13, which simplifies the installation process and facilitates assembly.

[0033] More specifically, such as Figures 1-3 As shown, a receiving cavity 131 is formed between the rotating shaft 200, the second cover 13, and the housing 100. The first cover 12 divides the receiving cavity 131 into two oil return chambers 1311. Two oil slinger rings 203 are provided on the rotating shaft 200. The two oil slinger rings 203 are arranged one-to-one with the two oil return chambers 1311, so that the oil slinger rings 203 can throw off the oil adhering to the rotating shaft 200 and guide the oil back to the area that needs lubrication through the oil return chambers 1311, thereby keeping the inside of the gearbox clean and lubricated.

[0034] More specifically, such as Figure 3 As shown, the first cover 12 and the second cover 13 are respectively fitted with the oil slinger ring 203 with a gap, thereby forming a labyrinth seal gap. That is, the connection between the first cover 12 and the oil slinger ring 203, and the second cover 13 and the oil slinger ring 203, forms a multi-bent and extended connecting seam structure to avoid interference with the high-speed operation of the rotating shaft 200.

[0035] Specifically, such as Figure 1 and Figure 2 As shown, the diversion hole 21 penetrates the first windbreak member 2 along the radial direction of the rotating shaft 200. Since the penetration direction of the diversion hole 21 is perpendicular to the rotation direction of the rotating shaft 200, the oil mist is more evenly dispersed when passing through the diversion hole 21, reducing the situation of excessively high local oil mist concentration.

[0036] Specifically, such as Figure 1 and Figure 2 As shown, the first wind deflector 2 includes an extension 24, which extends towards the rotating shaft 200 and forms a pressure-reducing channel 22 with the rotating shaft 200. By providing the pressure-reducing channel 22, the air pressure inside the housing 100 can be reduced in a timely manner, preventing oil mist from being ejected through the escaping channel 202 under high pressure. Moreover, by providing the extension 24, the oil mist discharged through the escaping channel 202 will be obstructed and dispersed by the extension 24, which helps to reduce the concentrated emission and splashing of oil mist.

[0037] More specifically, such as Figure 2 As shown, the extension 24 extends radially along the shaft 200, which can make more efficient use of the space of the wind turbine gearbox and make the overall structure more compact.

[0038] More specifically, such as Figure 1 and Figure 2 As shown, the gap between the extension 24 and the rotating shaft 200 is 1 to 10 mm, which is equivalent to the inner diameter of the pressure reducing channel 22 being 1 to 10 mm. This arrangement not only releases the air pressure inside the housing 100 in a timely manner to prevent oil mist from being sprayed, but also diverts the oil mist in the buffer chamber 23, reducing the suction force of the negative pressure generated by the high-speed rotation of the external gear on the oil mist.

[0039] Specifically, such as Figure 1 and Figure 2 As shown, the cover assembly 1 has a stepped portion 11, and the first windbreak 2 is snapped onto the stepped portion 11. By setting the stepped portion 11, a stable positioning point is provided for the first windbreak 2. By snapping the first windbreak 2 onto the stepped portion 11, it can be ensured that the first windbreak 2 will not move or loosen during the operation of the wind turbine gearbox, thereby ensuring the stability and reliability of the entire structure.

[0040] More specifically, in this embodiment, the stepped portion 11 is an annular boss, the first windbreak 2 is engaged with the annular boss, and a stable connection between the first windbreak 2 and the cover assembly 1 is achieved by bolts or pins. In other embodiments, the stepped portion 11 is an annular groove, and the first windbreak 2 is provided with an annular protrusion that engages with the annular groove. That is, as long as the above-mentioned functions can be achieved, the specific structure of the above-mentioned components will not be limited in detail.

[0041] Specifically, such as Figure 1 and Figure 2 As shown, the wind turbine gearbox also includes a second windbreak 3, which is disposed on the first windbreak 2 and has a wind-blocking part 31, which is disposed opposite to the diversion hole 21. When oil mist passes through the diversion hole 21, the wind-blocking part 31 can further block and disperse the oil mist, reducing its direct spraying onto the outside of the gearbox 100. This reduces the pollution of the surrounding environment by oil mist and protects the normal operation of the wind turbine gearbox.

[0042] More specifically, in this embodiment, one end of the second windbreak 3 is bent to one side to form a windbreak portion 31, and the other end of the second windbreak 3 is bolted to the first windbreak 2, making the connection between the first windbreak 2 and the second windbreak 3 more stable and facilitating on-site processing and assembly. In other embodiments, the first windbreak 2 and the second windbreak 3 can be designed as a single piece to reduce assembly operations and improve work efficiency.

[0043] Specifically, such as Figure 1 and Figure 2 As shown, a turbulence chamber 32, which is connected to the outside, is formed between the wind deflector 31 and the first wind deflector 2. The buffer chamber 23 is connected to the turbulence chamber 32 through the diversion hole 21. On the one hand, by setting the buffer chamber 23 and the turbulence chamber 32, the path length of gas flow is increased, so that the high-pressure gas inside the housing 100 can be better buffered and depressurized by passing through the buffer chamber 23 and the turbulence chamber 32 in sequence during the release process, thereby reducing the violent splashing and spraying of oil mist. On the other hand, when the oil mist enters the turbulence chamber 32 through the diversion hole 21, it will be obstructed and dispersed by the first wind deflector 2 and the wind deflector 31, reducing the leakage of oil mist.

[0044] Specifically, such as Figure 1 and Figure 2As shown, in this embodiment, the second baffle 3 has a through hole 33 coaxially arranged with the diversion hole 21 to ensure that the high-pressure gas inside the housing 100 can pass more smoothly through the diversion hole 21 and the through hole 33, preventing oil mist from being sprayed. Moreover, through the cooperation of the diversion hole 21, the through hole 33 and the pressure reducing channel 22, the oil mist discharged through the escaping channel 202 can be diverted, reducing the suction capacity of the negative pressure outside the housing 100 on the oil mist and preventing excessive leakage of oil mist. In other embodiments, the through hole 33 can be offset from the diversion hole 21 to improve the blocking effect of oil mist, which is not limited here.

[0045] It should be noted that the first cover 12, the second cover 13, the first windbreak 2 and the second windbreak 3 in this embodiment can all adopt plate-shaped or block-shaped structures, as long as they can meet the above-mentioned functions. The specific structure of the above components is not limited in this way.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A wind turbine gearbox, comprising a housing (100) and a rotating shaft (200) rotatably connected to the housing (100), characterized in that, The wind turbine gearbox also includes: A cover assembly (1) is disposed on the housing (100). The rotating shaft (200) is provided with a protrusion (201). The protrusion (201) is placed outside the housing (100). The cover assembly (1) is sleeved on the protrusion (201) and forms an escaping channel (202) between the cover assembly (1) and the protrusion (201). The interior of the housing (100) is connected to the exterior through the escaping channel (202). The first windbreak (2) is sleeved on the protrusion (201) and connected to the cover assembly (1), and has a diversion hole (21). A pressure-reducing channel (22) is formed between the first windbreak (2) and the protrusion (201). The cover assembly (1), the protrusion (201) and the first windbreak (2) together form a buffer cavity (23). The buffer cavity (23) is connected to the outlet end of the escaping channel (202) and is connected to the outside through the pressure-reducing channel (22) and the diversion hole (21).

2. The wind turbine gearbox according to claim 1, characterized in that, The diversion hole (21) passes through the first windbreak (2) in the radial direction of the rotating shaft (200).

3. The wind turbine gearbox according to claim 1, characterized in that, The first wind deflector (2) includes an extension (24) which extends toward the pivot (200) and forms the pressure relief channel (22) with the pivot (200).

4. The wind turbine gearbox according to claim 3, characterized in that, The gap between the extension (24) and the rotating shaft (200) is 1 to 10 mm.

5. The wind turbine gearbox according to claim 1, characterized in that, The cover assembly (1) is provided with a stepped portion (11), and the first windproof member (2) is fitted onto the stepped portion (11).

6. The wind turbine gearbox according to claim 1, characterized in that, The wind turbine gearbox also includes a second windshield (3), which is disposed on the first windshield (2) and has a windshield portion (31), which is disposed opposite to the diversion hole (21).

7. The wind turbine gearbox according to claim 6, characterized in that, The windbreak (31) and the first windbreak (2) form a turbulence cavity (32) that communicates with the outside. The buffer cavity (23) is connected to the turbulence cavity (32) through the diversion hole (21).

8. The wind turbine gearbox according to claim 6, characterized in that, The second wind deflector (3) has a through hole (33) that is coaxially arranged with the diversion hole (21).

9. The wind turbine gearbox according to any one of claims 1-8, characterized in that, The sealing assembly (1) includes a first cover (12) and a second cover (13). The box (100), the first cover (12) and the second cover (13) are connected in sequence along the extension direction of the rotating shaft (200). The first windproof member (2) is disposed on the second cover (13).

10. The wind turbine gearbox according to claim 9, characterized in that, A receiving cavity (131) is formed between the rotating shaft (200), the second cover (13) and the box (100). The first cover (12) divides the receiving cavity (131) into two oil return chambers (1311). Two oil slinger rings (203) are provided on the rotating shaft (200), and the two oil slinger rings (203) are arranged in a one-to-one correspondence with the two oil return chambers (1311).

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