Wind turbine gearboxes and wind power equipment

Abstract

This invention relates to the field of wind power equipment technology, and provides a wind turbine gearbox and wind power equipment. A hollow outer ring rotatably passes through an end cover assembly, and the end cover assembly and the hollow outer ring define a first oil chamber. The hollow outer ring has a first oil inlet and a first oil outlet, and the first oil inlet communicates with the first oil chamber. A felt seal is disposed between the hollow outer ring and the end cover assembly, and the first oil chamber is located outside the felt seal. A hollow tube is inserted into the hollow outer ring and the two are coaxially fixed. The hollow tube has a second oil inlet and a second oil outlet, the second oil inlet communicating with the first oil inlet, and the second oil outlet communicating with the first oil outlet. A sealing ring is disposed inside the hollow tube and fixed to the hollow tube, and the sealing ring and the hollow tube define a second oil chamber, which communicates with the second oil inlet and the second oil outlet. An oil collection device is disposed on the hollow outer ring and connected to the first oil outlet. This reduces the contamination of the generator and nacelle by oil leaking from the felt seal.

Description

Technical Field

[0001] This invention relates to the field of wind turbine gearbox technology, and more particularly to a wind turbine gearbox and wind power equipment. Background Technology

[0002] Currently, most large-megawatt wind turbine generators adopt an integrated structure of the rear end of the main gearbox and the generator. The lubricating oil of the main gearbox needs to be effectively sealed and protected, otherwise it will contaminate the generator and nacelle, resulting in extremely high operation and maintenance costs.

[0003] In existing wind turbine gearboxes, the output shaft is a hollow structure, and the cables used to connect the electrical components inside the wind turbine gearbox to the generator are laid in the central cavity of the output shaft.

[0004] Currently, a labyrinth structure with multiple seals is typically used, but there is still a significant oil leakage rate. Furthermore, this part is enclosed inside the generator, leaving very little space for maintenance, resulting in high operation and maintenance costs for wind turbines operating on towers.

[0005] Therefore, there is an urgent need for a wind turbine gearbox and wind power equipment to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a wind turbine gearbox and wind power equipment that can reduce the pollution of the generator and nacelle by oil leaking from the felt seal.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] Wind turbine gearbox, including:

[0009] End cap assembly;

[0010] An input shaft is rotatably inserted through the end cover assembly. The interior of the input shaft is hollow to form a receiving cavity. The input end of the input shaft is located outside the end cover assembly (1). The interior of the input end is provided with a stepped surface so that the input end forms a hollow outer ring. The hollow outer ring is rotatably inserted through the end cover assembly. The end cover assembly and the hollow outer ring define a first oil cavity. The hollow outer ring is provided with a first oil inlet hole and a first oil outlet hole. The first oil inlet hole communicates with the first oil cavity.

[0011] A felt seal is disposed between the hollow outer ring and the end cap assembly, and the first oil cavity is located on the outside of the felt seal.

[0012] A hollow tube is inserted into the hollow outer ring and the two are fixed coaxially. The hollow tube has a second oil inlet hole and a second oil outlet hole. The second oil inlet hole is connected to the first oil inlet hole, and the second oil outlet hole is connected to the first oil outlet hole.

[0013] A sealing ring is disposed on the inner side of the hollow tube and fixed to the hollow tube. The sealing ring and the hollow tube define a second oil cavity, which is connected to the second oil inlet and the second oil outlet.

[0014] An oil collection component is disposed on the hollow outer ring and connected to the first oil drain hole.

[0015] As a preferred technical solution of the aforementioned wind turbine gearbox, the aforementioned end cover assembly includes a through cover and an oil baffle plate. The aforementioned felt seal is sandwiched between the aforementioned through cover and the aforementioned hollow outer ring. The aforementioned oil baffle plate is detachably fixed to the aforementioned through cover. The aforementioned oil baffle plate is sleeved on the outside of the aforementioned hollow outer ring. The aforementioned through cover, the aforementioned oil baffle plate, and part of the aforementioned hollow outer ring form the aforementioned first oil cavity.

[0016] As a preferred technical solution for the aforementioned wind turbine gearbox, multiple first oil inlets are provided, and the multiple first oil inlets are arranged around the axis of the aforementioned hollow outer ring.

[0017] The aforementioned second oil inlet hole is provided in multiple ways, and the multiple aforementioned second oil inlet holes are arranged around the axis of the aforementioned hollow outer ring;

[0018] The aforementioned first oil inlet holes are connected to the aforementioned second oil inlet holes one by one.

[0019] As a preferred technical solution of the aforementioned wind turbine gearbox, the first oil drain hole and the first oil inlet hole are spaced apart along the axial direction of the hollow outer ring, and the first oil drain hole is located on the side of the first oil inlet hole away from the first oil cavity.

[0020] As a preferred technical solution of the aforementioned wind turbine gearbox, the inner peripheral wall of the hollow tube is provided with a first oil collecting groove around its axis, and the outer peripheral wall of the sealing ring is provided with a second oil collecting groove around its own axis. The sealing ring is installed in the first oil collecting groove, and a portion of the inner wall of the first oil collecting groove and the inner wall of the second oil collecting groove form the second oil cavity.

[0021] As a preferred technical solution of the above-mentioned wind turbine gearbox, the outer peripheral wall of the hollow tube is provided with a first docking groove, one side opening of the second oil inlet is formed at the bottom of the first docking groove, the first oil inlet is connected to the second oil inlet through the first docking groove, and the edge contour of the first oil inlet is located in the first docking groove.

[0022] And / or, the inner peripheral wall of the hollow outer ring is provided with a second mating groove, one side opening of the first oil inlet hole is formed at the bottom of the second mating groove, the first oil inlet hole is connected to the second oil inlet hole through the second mating groove, and the edge contour of the second oil inlet hole is located in the second mating groove.

[0023] As a preferred technical solution for the aforementioned wind turbine gearbox, the aforementioned oil collection component is threadedly connected to the aforementioned first oil drain hole.

[0024] As a preferred technical solution for the aforementioned wind turbine gearbox, the hollow tube and the hollow outer ring are fixed by a second threaded fastener, and the second threaded fastener is located outside the first oil cavity.

[0025] As a preferred technical solution for the aforementioned wind turbine gearbox, the end cover assembly is further provided with a cooling channel. One end of the cooling channel is used for refrigerant entry, and the other end of the cooling channel is connected to the first oil chamber. The cooling channel is provided with a one-way valve, which allows refrigerant to flow along the cooling channel to the first oil chamber.

[0026] A wind power device is also provided, including a generator, cables and the aforementioned wind power gearbox, wherein the hollow tube is connected to the generator and the cables are inserted inside the hollow tube.

[0027] Beneficial effects of this invention:

[0028] The present invention provides a wind turbine gearbox and wind power equipment. The wind turbine gearbox includes an end cover assembly, an input shaft, a felt seal, a hollow tube, a sealing ring, and an oil collection component. The input shaft rotatably passes through the end cover assembly. The interior of the input shaft is hollow, forming a receiving cavity. The input end of the input shaft is located outside the end cover assembly. The interior of the input end is provided with a stepped surface so that the input end forms a hollow outer ring that rotatably passes through the end cover assembly. The end cover assembly and the hollow outer ring define a first oil cavity. The hollow outer ring has a first oil inlet and a first oil outlet, and the first oil inlet communicates with the first oil cavity. A felt seal is disposed between the hollow outer ring and the end cover assembly, and the first oil cavity is located outside the felt seal. A hollow tube is inserted into the hollow outer ring and the two are coaxially fixed. The hollow tube has a second oil inlet and a second oil outlet, and the second oil inlet communicates with the first oil inlet and the second oil outlet communicates with the first oil outlet. A sealing ring is disposed inside the hollow tube and fixed to the hollow tube. The sealing ring and the hollow tube define a second oil cavity, and the second oil cavity communicates with the second oil inlet and the second oil outlet. An oil collection device is disposed on the hollow outer ring and connected to the first oil outlet.

[0029] For example, the end cap assembly has a plug-in hole, which is a variable diameter hole. The plug-in hole includes a first hole segment, a second hole segment, and a third hole segment. The first hole segment, the second hole segment, and the third hole segment are coaxially arranged and sequentially along the axial direction. The radius of the first hole segment and the radius of the third hole segment are both smaller than the radius of the second hole segment. A hollow outer ring is inserted into the plug-in hole. A felt seal is sandwiched between the outer peripheral wall of the hollow outer ring and the inner peripheral wall of the first hole segment. The outer peripheral wall of the hollow outer ring and the inner peripheral wall of the third hole segment form a seal. The outer peripheral wall of the hollow outer ring and the second hole segment form a first oil cavity. The first oil cavity is an annular space formed around the axis of the hollow outer ring. The first oil cavity is located on the side of the felt seal that faces away from the oil pool. Oil leaking from the felt seal collects in the first oil cavity. One end of the hollow tube is fixedly inserted into the hollow outer ring. The sealing ring and the hollow tube are fixed to form a second oil cavity. The second oil cavity is a circular space formed around the axis of the hollow tube. The first oil cavity, the first oil inlet, the second oil inlet, the second oil cavity, the second oil outlet, and the first oil outlet are connected in sequence. The cable used to connect the wind turbine gearbox and the generator is installed in the empty cavity of the input shaft.

[0030] During the operation of the wind turbine gearbox, the hollow outer ring and hollow tube rotate relative to the end cover assembly. The direction of rotation is the rotation around its own axis. Under the agitation, the oil in the oil sump is prone to leak from the felt seal. After the leaked oil enters the first oil chamber, some of the oil can enter the second oil chamber through the first and second oil inlets in sequence, and then be discharged from the second oil chamber through the second and first oil outlets. This can reduce the pollution of the generator and nacelle by the oil leaking from the felt seal. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the wind turbine gearbox provided in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0034] Figure 3 for Figure 1 A magnified view of a section at point B.

[0035] In the picture:

[0036] 1. End cap assembly; 11. Through cap; 12. Oil baffle; 13. First threaded fastener; 14. Cooling channel; 141. Channel A; 142. Channel B;

[0037] 2. Hollow outer ring; 21. First oil cavity; 22. First oil inlet; 23. First oil outlet;

[0038] 3. Hollow tube; 31. Second oil cavity; 32. Second oil inlet; 33. Second oil outlet; 34. First mating groove; 35. Second threaded fastener;

[0039] 4. Sealing ring;

[0040] 5. Felt seals;

[0041] 6. Oil collection components. Detailed Implementation

[0042] 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 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, and not all of the structures.

[0043] In the description of this invention, 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 invention based on the specific circumstances.

[0044] 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.

[0045] 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0046] like Figures 1 to 3 As shown, this invention provides a wind turbine gearbox, comprising: an end cover assembly 1, an input shaft, a felt seal 5, a hollow tube 3, a sealing ring 4, and an oil collection component 6. The input shaft rotatably passes through the end cover assembly 1, and its hollow interior forms a receiving cavity. The input end of the input shaft is located outside the end cover assembly 1, and its interior has a stepped surface to form a hollow outer ring 2 that rotatably passes through the end cover assembly 1. The end cover assembly 1 and the hollow outer ring 2 define a first oil cavity 21. The hollow outer ring 2 has a first oil inlet hole 22 and a first oil outlet hole 23, and the first oil inlet hole 22 communicates with the first oil cavity 21. The felt seal 5 is disposed between the hollow outer ring 2 and the end cover assembly 1, and the first oil cavity 21 is located outside the felt seal 5. The hollow tube 3... A second oil inlet 32 ​​and a second oil outlet 33 are provided on the hollow outer ring 2 and fixed coaxially. The second oil inlet 32 ​​is connected to the first oil inlet 22 and the second oil outlet 33 is connected to the first oil outlet 23. A sealing ring 4 is provided on the inner side of the hollow tube 3 and fixed to the hollow tube 3. The sealing ring 4 and the hollow tube 3 define a second oil cavity 31, which is connected to the second oil inlet 32 ​​and the second oil outlet 33. An oil collection component 6 is provided on the hollow outer ring 2 and connected to the first oil outlet 23. The cable for connecting the wind turbine gearbox and the generator is installed in the empty cavity of the input shaft.

[0047] For example, the end cap assembly 1 has a plug-in hole, which is a variable diameter hole. The plug-in hole includes a first hole segment, a second hole segment, and a third hole segment. The first hole segment, the second hole segment, and the third hole segment are coaxially arranged and sequentially along the axial direction. The radius of the first hole segment and the radius of the third hole segment are both smaller than the radius of the second hole segment. A hollow outer ring 2 is inserted into the plug-in hole. A felt seal 5 is sandwiched between the outer peripheral wall of the hollow outer ring 2 and the inner peripheral wall of the first hole segment. The outer peripheral wall of the hollow outer ring 2 and the inner peripheral wall of the third hole segment form a seal. The outer peripheral wall of the hollow outer ring 2 and the second hole segment form a first oil cavity 21. The first oil cavity 21 is an annular space formed around the axis of the hollow outer ring 2. The first oil cavity 21 is located on the side of the felt seal 5 facing away from the oil pool. The oil leaking from the felt seal 5 collects in the first oil cavity 21. One end of the hollow tube 3 is fixedly inserted into the hollow outer ring 2. The sealing ring 4 is fixed to the hollow tube 3 to form a second oil cavity. The second oil cavity is a circular space formed around the axis of the hollow tube 3. The first oil cavity 21, the first oil inlet hole 22, the second oil inlet hole 32, the second oil cavity 31, the second oil outlet hole 33 and the first oil outlet hole 23 are connected in sequence.

[0048] During the operation of the wind turbine gearbox, both the hollow outer ring 2 and the hollow tube 3 rotate relative to the end cover assembly 1. The direction of rotation is the rotation around its own axis. Under the agitation, the oil in the oil sump is prone to leak from the felt seal 5. After the leaked oil enters the first oil chamber 21, some of the oil can enter the second oil chamber 31 in sequence through the first oil inlet hole 22 and the second oil inlet hole 32, and then be discharged from the second oil chamber 31 through the second oil outlet hole 33 and the first oil outlet hole 23. This can reduce the pollution of the generator and nacelle by the oil leaking from the felt seal 5.

[0049] It should be noted that a one-way valve is provided in the first oil inlet 22 and / or the second oil inlet 32, which only allows the oil to flow unidirectionally from the first oil chamber 21 to the second oil chamber 31.

[0050] It should be noted that the first oil drain hole 23 and / or the second oil drain hole 33 are equipped with a switch valve, which can selectively open or close the connection between the second oil chamber 31 and the external environment.

[0051] It should be noted that the hollow section at the center of the hollow tube 3 and the hollow outer ring 2 is used to install the cable of the wind turbine hub control system.

[0052] Furthermore, the axes of the hollow tube 3 and the hollow outer ring 2 are set at an angle to the horizontal direction, that is, in the vertical direction, the first oil inlet 22 is located at the lowest end of the first oil cavity 21.

[0053] Optionally, the end cap assembly 1 includes a through cap 11 and an oil baffle 12. A felt seal 5 is sandwiched between the through cap 11 and the hollow outer ring 2. The oil baffle 12 is detachably fixed to the through cap 11 and is sleeved on the outside of the hollow outer ring 2. The through cap 11, the oil baffle 12 and part of the hollow outer ring 2 form a first oil cavity 21.

[0054] For example, the end cap assembly 1 includes a through cap 11 and an oil baffle 12. A first hole segment and a second hole segment are both formed in the through cap 11. The first hole segment is the second mounting port. The hollow outer ring 2 is inserted into both the first mounting port and the second mounting port. The oil baffle 12 is installed in the first mounting port. The inner ring of the oil baffle 12 forms a third hole segment. The through cap 11, the oil baffle 12, and the hollow outer ring 2 form a first oil cavity 21. With this configuration, when maintaining the wind turbine gearbox, after removing the oil baffle 12, the hollow outer ring 2 can be removed from the through cap 11, simplifying the disassembly process.

[0055] Optionally, the oil baffle 12 and the through cover 11 are fixed by a first threaded fastener 13, the axis of which is parallel to the axis of the hollow outer ring 2.

[0056] Optionally, multiple first oil inlets 22 are provided, arranged around the axis of the hollow outer ring 2; multiple second oil inlets 32 are provided, arranged around the axis of the hollow outer ring 2; the multiple first oil inlets 22 and the multiple second oil inlets 32 are connected in a one-to-one correspondence. Thus, when the hollow tube 3 and the hollow outer ring 2 rotate relative to the end cap assembly 1, some of the first oil inlets 22 will always face upwards to receive oil leaking from the felt seal 5.

[0057] Optionally, the first oil drain hole 23 and the first oil inlet hole 22 are spaced apart along the axial direction of the hollow outer ring 2, with the first oil drain hole 23 located on the side of the first oil inlet hole 22 away from the first oil chamber 21.

[0058] Optionally, the inner peripheral wall of the hollow tube 3 is provided with a first oil collecting groove around its axis, and the outer peripheral wall of the sealing ring 4 is provided with a second oil collecting groove around its own axis. The sealing ring 4 is installed in the first oil collecting groove, and part of the inner wall of the first oil collecting groove and the inner wall of the second oil collecting groove form a second oil cavity 31.

[0059] Optionally, the sealing ring 4 is made of rubber and is interference-fitted with the hollow tube 3 in the second oil cavity 31.

[0060] Optionally, the outer peripheral wall of the hollow tube 3 is provided with a first mating groove 34, and one side opening of the second oil inlet hole 32 is formed at the bottom of the first mating groove 34. The first oil inlet hole 22 communicates with the second oil inlet hole 32 through the first mating groove 34, and the edge contour of the first oil inlet hole 22 is located within the first mating groove 34; and / or, the inner peripheral wall of the hollow outer ring 2 is provided with a second mating groove, and one side opening of the first oil inlet hole 22 is formed at the bottom of the second mating groove. The first oil inlet hole 22 communicates with the second oil inlet hole 32 through the second mating groove, and the edge contour of the second oil inlet hole 32 is located within the second mating groove.

[0061] For example, a first mating groove 34 is provided on the outer peripheral wall of the hollow tube 3. The first mating groove 34 is opened around the axis of the hollow tube 3. The length direction of the first mating groove 34 is the circumferential direction of the hollow tube 3, the width direction of the first mating groove 34 is the axial direction of the hollow tube 3, and the depth direction of the first mating groove 34 is the radial direction of the hollow tube 3. When the hollow tube 3 is inserted into the hollow outer ring 2, the inner peripheral wall of the hollow outer ring 2 closes the opening in the depth direction of the first mating groove 34. The first oil inlet hole 22 communicates with the first mating groove 34, and the second oil inlet hole 32 is opened on the bottom wall of the first mating groove 34. The width D of the first mating groove 34 satisfies d1 < D < d2, where d1 is the diameter of the first oil inlet hole 22 and d2 is the diameter of the second oil inlet hole 32. This facilitates the mating of the first oil inlet hole 22 and the second oil inlet hole 32 and reduces the requirements for machining accuracy.

[0062] Optionally, the hollow tube 3 and the hollow outer ring 2 are fixed by a second threaded fastener 35, and the second threaded fastener 35 is located outside the first oil cavity 21.

[0063] For example, the hollow outer ring 2 has a through hole, the hollow tube 3 has a threaded hole, and the second threaded fastener 35 passes through the through hole and is threadedly connected to the hollow tube 3 in the threaded hole.

[0064] With this configuration, during disassembly and assembly, the hollow tube 3 can be removed from the hollow outer ring 2 from the outside of the end cap assembly 1, maintaining the connection between the hollow outer ring 2 and the end cap assembly 1.

[0065] Furthermore, the axis of the second threaded fastener 35 is parallel to the radial direction of the hollow outer ring 2.

[0066] Furthermore, the hollow tube 3 and the hollow outer ring 2 are connected by a plurality of second threaded fasteners 35, which are arranged around the axis of the hollow tube 3.

[0067] Optionally, the end cap assembly 1 is also provided with a cooling channel 14, one end of which is used for refrigerant entry, and the other end of which is connected to the first oil chamber 21; the cooling channel 14 is provided with a one-way valve, which allows the refrigerant to flow along the cooling channel 14 to the first oil chamber 21.

[0068] With this configuration, refrigerant is introduced into the first oil chamber 21 through the cooling channel 14 to reduce the oil temperature. The one-way valve prevents the oil in the first oil chamber 21 from leaking out through the cooling channel 14.

[0069] For example, the cooling channel 14 includes channel A141 and channel B142. Channel A141 is opened along the axial direction of the hollow outer ring 2. One end of channel A141 forms a first port on the side surface of the end cover assembly 1 opposite to the oil sump, and the other end is closed. Channel B142 is opened along the radial direction of the hollow outer ring 2. One end of channel B142 is connected to channel A141, and the other end forms a second port in the first oil cavity 21.

[0070] Furthermore, in the radial direction of the hollow outer ring 2, the distance from the flow channel A141 to the axis of the hollow outer ring 2 is L1, and the distance from the first oil chamber 21 to the axis of the hollow outer ring 2 is L2, where L1 > L2.

[0071] A wind power device is also provided, including a generator, cables and the aforementioned wind power gearbox, with a hollow tube connected to the generator and the cables passing through the hollow tube 3.

[0072] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A wind turbine gearbox, characterized in that, include: End cap assembly (1); An input shaft is rotatably inserted through the end cap assembly (1). The interior of the input shaft is hollow to form a receiving cavity. The input end of the input shaft is located outside the end cap assembly (1). The interior of the input end is provided with a stepped surface so that the input end forms a hollow outer ring (2). The hollow outer ring (2) is rotatably inserted through the end cap assembly (1). The end cap assembly (1) and the hollow outer ring (2) define a first oil cavity (21). The hollow outer ring (2) has a first oil inlet hole (22) and a first oil outlet hole (23). The first oil inlet hole (22) communicates with the first oil cavity (21). A felt seal (5) is disposed between the hollow outer ring (2) and the end cap assembly (1), and the first oil cavity (21) is located on the outside of the felt seal (5); Hollow tube (3), the hollow tube (3) is inserted into the hollow outer ring (2) and the two are fixed coaxially. The hollow tube (3) has a second oil inlet hole (32) and a second oil outlet hole (33). The second oil inlet hole (32) is connected to the first oil inlet hole (22), and the second oil outlet hole (33) is connected to the first oil outlet hole (23). A sealing ring (4) is disposed on the inner side of the hollow tube (3) and fixed to the hollow tube (3). The sealing ring (4) and the hollow tube (3) define a second oil cavity (31). The second oil cavity (31) is connected to the second oil inlet (32) and the second oil outlet (33). An oil collection component (6) is disposed on the hollow outer ring (2) and connected to the first oil drain hole (23).

2. The wind turbine gearbox according to claim 1, characterized in that, The end cap assembly (1) includes a through cap (11) and an oil baffle (12). The felt seal (5) is sandwiched between the through cap (11) and the hollow outer ring (2). The oil baffle (12) is detachably fixed to the through cap (11). The oil baffle (12) is sleeved on the outside of the hollow outer ring (2). The through cap (11), the oil baffle (12) and part of the hollow outer ring (2) form the first oil cavity (21).

3. The wind turbine gearbox according to claim 1, characterized in that, Multiple first oil inlets (22) are provided, and the multiple first oil inlets (22) are arranged around the axis of the hollow outer ring (2); Multiple second oil inlets (32) are provided, and the multiple second oil inlets (32) are arranged around the axis of the hollow outer ring (2); The multiple first oil inlet holes (22) are connected to the multiple second oil inlet holes (32) in a one-to-one correspondence.

4. The wind turbine gearbox according to claim 1, characterized in that, The first oil drain hole (23) and the first oil inlet hole (22) are spaced apart along the axial direction of the hollow outer ring (2), and the first oil drain hole (23) is located on the side of the first oil inlet hole (22) away from the first oil cavity (21).

5. The wind turbine gearbox according to claim 1, characterized in that, The inner circumferential wall of the hollow tube (3) is provided with a first oil collection groove around its axis, and the outer circumferential wall of the sealing ring (4) is provided with a second oil collection groove around its own axis. The sealing ring (4) is installed in the first oil collection groove, and a part of the inner wall of the first oil collection groove and the inner wall of the second oil collection groove form the second oil cavity (31).

6. The wind turbine gearbox according to claim 1, characterized in that, The outer peripheral wall of the hollow tube (3) is provided with a first docking groove (34), and one side opening of the second oil inlet hole (32) is formed at the bottom of the first docking groove (34). The first oil inlet hole (22) is connected to the second oil inlet hole (32) through the first docking groove (34), and the edge contour of the first oil inlet hole (22) is located in the first docking groove (34). And / or, the inner peripheral wall of the hollow outer ring (2) is provided with a second mating groove, one side opening of the first oil inlet hole (22) is formed at the bottom of the second mating groove, the first oil inlet hole (22) is connected to the second oil inlet hole (32) through the second mating groove, and the edge contour of the second oil inlet hole (32) is located in the second mating groove.

7. The wind turbine gearbox according to claim 1, characterized in that, The oil collection component (6) is threadedly connected to the first oil drain hole (23).

8. The wind turbine gearbox according to claim 1, characterized in that, The hollow tube (3) and the hollow outer ring (2) are fixed by a second threaded fastener (35), and the second threaded fastener (35) is located outside the first oil cavity (21).

9. The wind turbine gearbox according to any one of claims 1-8, characterized in that, The end cap assembly (1) is also provided with a cooling channel (14), one end of which is used for refrigerant to enter, and the other end of which is connected to the first oil chamber (21); the cooling channel (14) is provided with a one-way valve, which allows refrigerant to flow along the cooling channel (14) to the first oil chamber (21).

10. Wind power equipment, characterized in that, The device includes a generator, cables, and a wind turbine gearbox as described in any one of claims 1-9, wherein the hollow tube (3) is connected to the generator, and the cables are inserted inside the hollow tube (3).

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