Wind power gear box lubricating system

Abstract

The invention discloses a wind power gear box lubricating system, and relates to the technical field of wind power generation, the wind power gear box lubricating system comprises a mechanical pump arranged on one side of a gear box, and a gear box output shaft is arranged on the side, close to the mechanical pump, of the gear box; a mechanical pump input shaft in transmission connection with the gearbox output shaft is arranged on the side, close to the gearbox, of the mechanical pump, and a speed increasing assembly is connected between the mechanical pump and the gearbox and comprises a box body; the speed increaser input shaft is arranged on the box body and is in transmission connection with the gearbox output shaft; the speed increaser output shaft is arranged on the box body and is in transmission connection with the mechanical pump input shaft; the speed increasing gear train is arranged in the box body and is connected between the speed increaser input shaft and the speed increaser output shaft; the input rotating speed of the mechanical pump is effectively increased, so that the flow of the mechanical pump is increased, enough oil is provided for each part of the gear box for lubrication, and the problem that the gear box fails in advance is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and more particularly to a wind power gearbox lubrication system. Background Art

[0002] The wind turbine gearbox is the core mechanical component of the wind turbine generator set. Its basic function is to transfer the low speed generated by the wind rotor under the action of wind to the generator through the speed increase effect, so that the generator can reach the speed required for power generation. During the operation of the gearbox, all parts of the planetary gear train, especially the gear meshing parts and bearings, need to be lubricated to ensure the normal operation of the gearbox.

[0003] At present, the lubrication system of wind turbine gearbox mainly adopts a dual oil pump design of mechanical pump and electric pump, in which the mechanical pump is powered by the rotation of the wind turbine rotor, while the electric pump is completely powered by external electricity.

[0004] However, when the wind turbine generator set is installed but not powered on, the gearbox is already under a certain load and needs adequate lubrication. However, due to the lack of external power supply, the electric pump cannot be started and can only rely on the mechanical pump to provide circulating lubricating oil. The flow rate of the mechanical pump is determined by its input speed, that is, the speed of the wind wheel. Usually, the flow rate increases with the increase of the input speed. At this stage, the wind wheel is in a free swinging state and the speed of the wind wheel is very low, resulting in a very low input speed of the mechanical pump. It cannot provide enough oil to lubricate various parts of the gearbox, causing damage to components such as gears and bearings, affecting the service life of the gearbox. This stage usually lasts for 1 to 6 months, and sometimes even up to 1 to 2 years.

[0005] In summary, how to avoid the situation where insufficient oil is provided to lubricate various parts of the gearbox, resulting in premature failure of the gearbox, is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a wind turbine gearbox lubrication system to effectively increase the input speed of the mechanical pump, thereby increasing the flow rate of the mechanical pump, and then providing sufficient oil to lubricate various parts of the gearbox to avoid the problem of premature failure of the gearbox.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A wind power gearbox lubrication system comprises a mechanical pump arranged on one side of the gearbox, a gearbox output shaft is arranged on the side of the gearbox close to the mechanical pump, a mechanical pump input shaft drivingly connected to the gearbox output shaft is arranged on the side of the mechanical pump close to the gearbox, a speed increasing component is connected between the mechanical pump and the gearbox, and the speed increasing component comprises a casing, a speed increasing device input shaft arranged on the casing and drivingly connected to the gearbox output shaft, a speed increasing device output shaft arranged on the casing and drivingly connected to the mechanical pump input shaft, and a speed increasing gear train arranged in the casing and connected between the speed increasing device input shaft and the speed increasing device output shaft.

[0009] Preferably, a gearbox output flange is provided on one side of the housing close to the gearbox, one end of the gearbox output flange is detachably connected to the housing, and the other end of the gearbox output flange is detachably connected to the gearbox.

[0010] Preferably, a speed increaser output flange is provided on one side of the casing close to the mechanical pump, one end of the speed increaser output flange is detachably connected to the casing, and the other end of the speed increaser output flange is detachably connected to the mechanical pump.

[0011] Preferably, a first coupling is provided between the gearbox output shaft and the speed increaser input shaft so as to achieve transmission connection between the gearbox output shaft and the speed increaser input shaft.

[0012] Preferably, a second coupling is provided between the speed increaser input shaft and the speed increaser output shaft so as to achieve transmission connection between the speed increaser input shaft and the speed increaser output shaft.

[0013] Preferably, the speed-increasing gear train is a fixed-axis gear train or an epicyclic gear train, and the speed-increasing ratio of the speed-increasing gear train is in the range of 1:4-1:10.

[0014] Preferably, the mechanical pump is provided with an oil inlet pipe, one end of the oil inlet pipe is connected to the oil outlet of the gear box, and the other end of the oil inlet pipe is connected to the oil inlet of the mechanical pump;

[0015] The gear box is provided with an oil circuit distributor, the mechanical pump is provided with an oil outlet pipe, one end of the oil outlet pipe is connected with the oil outlet of the mechanical pump, and the other end of the oil outlet pipe is connected with the oil circuit distributor, and the oil outlet pipe is provided with a cooling component for cooling the lubricating oil in the oil outlet pipe.

[0016] Preferably, the cooling assembly comprises a cooling box arranged on the oil outlet pipe, wherein an air cooler is arranged in the cooling box, and the air cooler is used to cool the lubricating oil in the cooling box;

[0017] The oil outlet pipe includes a first pipeline connected to the cooling box and the oil outlet of the mechanical pump and a second pipeline connected to the cooling box and the oil circuit distributor. An electric pump is provided in the cooling box, and the electric pump is used to transport the lubricating oil flowing through the cooling box to the second pipeline.

[0018] Preferably, a filter is provided in the cooling box, the filter is connected to the first pipeline, and the filter is used to filter the lubricating oil flowing into the cooling box through the first pipeline.

[0019] Preferably, a pressure sensor is provided in the cooling box, and the pressure sensor is used to monitor the pressure change of the lubricating oil flowing through the cooling box.

[0020] Preferably, the mechanical pump is a bidirectional mechanical pump, so that when the wind wheel rotates forward or reverse, the mechanical pump supplies oil in the same direction in an equal amount.

[0021] The wind power gearbox lubrication system provided by the present invention includes a mechanical pump arranged on one side of the gearbox, a gearbox output shaft is arranged on the side of the gearbox close to the mechanical pump, a mechanical pump input shaft transmission-connected to the gearbox output shaft is arranged on the side of the mechanical pump close to the gearbox, a speed increasing component is connected between the mechanical pump and the gearbox, and the speed increasing component includes a casing, a speed increasing device input shaft arranged on the casing and transmission-connected to the gearbox output shaft, a speed increasing device output shaft arranged on the casing and transmission-connected to the mechanical pump input shaft, and a speed increasing gear train arranged in the casing and connected between the speed increasing device input shaft and the speed increasing device output shaft.

[0022] The wind turbine gearbox lubrication system provided by the present invention effectively increases the input speed of the mechanical pump by means of a speed increasing component, thereby increasing the flow rate of the mechanical pump, and further providing sufficient oil to lubricate various parts of the gearbox, thereby avoiding the problem of premature failure of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 Schematic diagram of the lubrication system of the wind turbine gearbox in this embodiment;

[0025] Figure 2 It is a partial schematic diagram of the wind turbine gearbox lubrication system in this embodiment.

[0026] Reference numerals include:

[0027] 1. Gearbox; 11. Gearbox output shaft; 12. First coupling; 13. Gearbox output flange; 14. Oil distributor; 15. Gearbox internal gear train; 16. Gearbox input shaft; 17. Lubricating oil;

[0028] 2. Cooling box; 22. Filter; 25. Second pipeline;

[0029] 3. Box body; 31. Speed ​​increaser input shaft; 32. Speed ​​increaser gear train; 33. Speed ​​increaser output shaft; 34. Second coupling; 35. Speed ​​increaser output flange; 36. First bolt; 37. First sealing ring; 38. Second bolt; 39. Second sealing ring;

[0030] 4. Mechanical pump; 41. Mechanical pump input shaft; 43. Oil inlet pipe; 44. First pipeline;

[0031] 5. Wind wheel. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Unless otherwise defined, the technical terms or scientific terms used in the disclosure of this application shall have the usual meanings understood by persons with ordinary skills in the field to which the invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly. The embodiment of the present application discloses a wind turbine gearbox lubrication system.

[0034] The core of the present invention is to provide a wind power gearbox lubrication system.

[0035] Please refer to Figure 1 to Figure 2 ,in Figure 1 This is a schematic diagram of the lubrication system of a wind turbine gearbox. Figure 2 It is a partial schematic diagram of the wind turbine gearbox lubrication system in this embodiment.

[0036] The wind power gearbox lubrication system provided by the present invention includes a mechanical pump 4 arranged on one side of the gearbox 1, a gearbox output shaft 11 is arranged on the side of the gearbox 1 close to the mechanical pump 4, a mechanical pump input shaft 41 transmission-connected to the gearbox output shaft 11 is arranged on the side of the mechanical pump 4 close to the gearbox 1, a speed increasing component is connected between the mechanical pump 4 and the gearbox 1, and the speed increasing component includes a housing 3, a speed increasing gear input shaft 31 transmission-connected to the gearbox output shaft 11 arranged on the housing 3, a speed increasing gear output shaft 33 transmission-connected to the mechanical pump input shaft 41 arranged on the housing 3, and a speed increasing gear train 32 arranged in the housing 3 and connected between the speed increasing gear input shaft 31 and the speed increasing gear output shaft 33.

[0037] In the wind turbine gearbox lubrication system provided by the present invention, when the gearbox 1 is in a power-off state, a speed increasing component is arranged between the gearbox 1 and the mechanical pump 4. The speed increasing device input shaft 31 in the speed increasing component is connected to the gearbox output shaft 11 by transmission, and the speed increasing device output shaft 33 in the speed increasing component is connected to the mechanical pump input shaft 41 by transmission, so that the rotation speed of the gearbox output shaft 11 is transmitted to the mechanical pump input shaft 41. At the same time, with the help of the speed increasing gear train 32 in the speed increasing component, the speed increasing gear train 32 is used to increase the rotation speed of the speed increasing device input shaft 31 in the box body 3 and output it to the mechanical pump input shaft 41 through the speed increasing device output shaft 33, thereby effectively improving the input rotation speed of the mechanical pump 4.

[0038] The above-mentioned wind turbine gearbox lubrication system effectively increases the input speed of the mechanical pump 4, thereby increasing the flow rate of the mechanical pump 4, and further provides sufficient oil to lubricate various parts of the gearbox 1, thereby avoiding the problem of premature failure of the gearbox 1.

[0039] It should be noted that the shaft interface size of the speed increaser input shaft 31 and the mechanical pump input shaft 41 is the same. When the speed increaser component is not required for speed increase, the mechanical pump input shaft 41 can be connected to the gearbox output shaft 11 through the first coupling 12.

[0040] The wind turbine gearbox lubrication system provided by the present invention is described in more detail below with reference to the accompanying drawings and specific embodiments.

[0041] In a specific embodiment, reference Figure 1 and Figure 2 A gearbox output flange 13 is provided on one side of the housing 3 close to the gearbox 1 , one end of the gearbox output flange 13 is detachably connected to the housing 3 , and the other end of the gearbox output flange 13 is detachably connected to the gearbox 1 .

[0042] Specifically, the box body 3 is detachably connected to the gear box 1 by means of the gear box output flange 13, which facilitates the installation of the box body 3 when the gear box 1 is powered on, and the disassembly of the box body 3 when the gear box 1 is powered on, so that the internal structure of the box body 3 can increase the output speed of the gear box 1 generated by the wind wheel 5 driving the gear box 1 when the gear box 1 is powered off.

[0043] Optionally, the detachable connection described in this embodiment can be a detachable connection realized by bolts. Specifically, the side of the gearbox output flange 13 close to the housing 3 is detachably connected to the housing 3 through a first bolt 36, and the first bolt 36 is threadedly connected to the gearbox output flange 13 and the housing 3 in sequence. At the same time, a first sealing ring 37 can be provided on the connection surface between the housing 3 and the gearbox output flange 13 to improve the sealing performance of the connection between the two.

[0044] Based on any of the above embodiments, Figure 1 and Figure 2 A speed increaser output flange 35 is provided on one side of the housing 3 close to the mechanical pump 4 , one end of the speed increaser output flange 35 is detachably connected to the housing 3 , and the other end of the speed increaser output flange 35 is detachably connected to the mechanical pump 4 .

[0045] Specifically, the housing 3 is detachably connected to the mechanical pump 4 by means of the speed increaser output flange 35, so as to connect the housing 3 to the mechanical pump 4 when the gearbox 1 is powered off, so as to increase the input speed of the mechanical pump 4 and thereby increase the overall oil output of the mechanical pump 4.

[0046] Optionally, the detachable connection described in this embodiment can be a detachable connection achieved by bolts. Specifically, the side of the speed increaser output flange 35 close to the mechanical pump 4 is detachably connected by a second bolt 38. The second bolt 38 is threadedly connected to the speed increaser output flange 35 and the mechanical pump 4 in sequence, and a second sealing ring 39 can be provided at the connection surface of the speed increaser output flange 35 and the mechanical pump 4 to improve the sealing performance between the two.

[0047] Based on any of the above embodiments, Figure 1 and Figure 2 A first coupling 12 is provided between the gearbox output shaft 11 and the speed increaser input shaft 31 so that the gearbox output shaft 11 and the speed increaser input shaft 31 are transmission-connected.

[0048] Specifically, the gearbox output shaft 11 and the speed increaser input shaft 31 are connected by means of the first coupling 12, and the first coupling 12 can make the two rotate in coordination, thereby effectively transmitting torque and power. In addition, the first coupling 12 can compensate for the axial, radial and angular displacements that may occur between the two shafts, ensuring the normal operation of the transmission system.

[0049] Based on any of the above embodiments, Figure 1 and Figure 2 A second coupling 34 is provided between the speed increaser input shaft 31 and the speed increaser output shaft 33 to achieve transmission connection between the speed increaser input shaft 31 and the speed increaser output shaft 33. The second coupling 34 has the same function as the first coupling 12, and can effectively make the speed increaser input shaft 31 and the speed increaser output shaft 33 rotate in coordination, thereby ensuring the normal operation of the transmission system.

[0050] Based on any of the above embodiments, Figure 1 and Figure 2 The speed increasing gear train 32 is a fixed axis gear train, an epicyclic gear train or a compound gear train, and the speed increasing ratio of the speed increasing gear train 32 is in the range of 1:4-1:10. The speed increasing gear train 32 can realize forward or reverse rotation. The compound gear train is a combination of a fixed axis gear train and an epicyclic gear train.

[0051] Specifically, when a fixed-axis gear train is used as the speed-increasing gear train 32, the fixed-axis gear train has a very stable transmission ratio because the axes of all gears are fixed. During the speed-increasing transmission process, the output speed can be accurately controlled, which can effectively improve the stability of the output speed.

[0052] When an epicyclic gear train is used as the speed-increasing gear train 32, the epicyclic gear train can achieve different transmission ratios by changing the size and combination of different gears. During the speed-increasing transmission, the output speed can be adjusted as needed to meet different work requirements.

[0053] Based on any of the above embodiments, Figure 1 and Figure 2 The mechanical pump 4 is provided with an oil inlet pipe 43, one end of which is connected to the oil outlet of the gear box 1, and the other end of the oil inlet pipe 43 is connected to the oil inlet of the mechanical pump 4. The gear box 1 is provided with an oil circuit distributor 14, and the mechanical pump 4 is provided with an oil outlet pipe, one end of which is connected to the oil outlet of the mechanical pump 4, and the other end of the oil outlet pipe is connected to the oil circuit distributor 14. The oil outlet pipe is provided with a cooling component, which is used to cool the lubricating oil 17 in the oil outlet pipe.

[0054] Specifically, the lubricating oil 17 in the gearbox 1 flows into the mechanical pump 4 through the oil inlet pipe 43, and the mechanical pump 4 delivers the incoming lubricating oil 17 to the oil distributor 14 through the oil outlet pipe, so as to deliver the lubricating oil 17 to various parts in the gearbox 1. While the mechanical pump 4 delivers the incoming lubricating oil 17 to the oil distributor 14 through the oil outlet pipe, the lubricating oil 17 is cooled by the cooling assembly. Optionally, the mechanical pump 4 can be an internal gear pump, an external gear pump or a vane pump, etc., and the mechanical pump 4 is a bidirectional mechanical pump, so that when the wind wheel 5 rotates in the forward or reverse direction, the mechanical pump 4 supplies the same amount of oil in the same direction, thereby ensuring the stability of the overall oil supply of the device.

[0055] Based on any of the above embodiments, Figure 1 and Figure 2 The cooling assembly includes a cooling box 2 arranged on the oil outlet pipe, an air cooler is arranged in the cooling box 2, and the air cooler is used to cool the lubricating oil in the cooling box 2. The oil outlet pipe includes a first pipe 44 connected to the cooling box 2 and the oil outlet of the mechanical pump 4, and a second pipe 25 connected to the cooling box 2 and the oil circuit distributor 14. An electric pump is arranged in the cooling box 2, and the electric pump is used to transport the lubricating oil flowing through the cooling box 2 to the second pipe 25.

[0056] Specifically, the cooling box 2 is arranged between the mechanical pump 4 and the oil distributor 14. The mechanical pump 4 delivers the lubricating oil 17 to the cooling box 2 through the first pipe 44, and cools the lubricating oil 17 through the air cooler of the cooling box 2. After cooling, the electric pump in the cooling box 2 delivers the cooled lubricating oil 17 to the oil distributor 14 through the second pipe 25. The oil outlet pipe is divided into the first pipe 44 and the second pipe 25, which is convenient for disassembly and installation when the cooling component needs maintenance.

[0057] Based on any of the above embodiments, Figure 1 and Figure 2 A filter 22 is provided in the cooling box 2 . The filter 22 is connected to the first pipe 44 . The filter 22 is used to filter the lubricating oil 17 flowing into the cooling box 2 through the first pipe 44 .

[0058] Specifically, after the lubricating oil 17 in the first pipe 44 enters the cooling box 2, the lubricating oil 17 is filtered by the filter 22 located on one side of the cooling box 2, which can effectively filter out impurities in the lubricating oil 17, such as metal particles, dust, moisture, etc. The clean lubricating oil 17 after filtration can better lubricate the equipment, reduce friction resistance, and improve the operating efficiency and performance of the equipment.

[0059] Based on any of the above embodiments, Figure 1 and Figure 2A pressure sensor (not shown in the figure) is provided in the cooling box 2, and the pressure sensor is used to monitor the pressure change of the lubricating oil flowing through the cooling box 2. The pressure sensor can monitor the pressure change of the lubricating oil 17 in the lubricating system of the gear box 1 in real time. This is the basis for ensuring the normal operation of the lubricating system and the effective lubrication of the gear box 1. By accurately measuring the pressure of the lubricating oil 17, the working status of the lubricating system can be understood in time, providing a basis for subsequent maintenance and adjustment.

[0060] Based on any of the above embodiments, Figure 1 and Figure 2 The gearbox 1 further comprises a gearbox input shaft 16 and an internal gear train 15 of the gearbox. The gearbox input shaft 16 is connected to the wind wheel 5 by transmission. The gearbox input shaft 16 is connected to the gearbox output shaft 11 by transmission through the internal gear train 15 of the gearbox. The rotation or swing of the wind wheel 5 drives the internal gear train 15 of the gearbox to rotate, thereby driving the gearbox output shaft 11 to rotate. The speed of the gearbox output shaft 11: the speed of the wind wheel 5 is in the range of 1:100-1:200.

[0061] The above is a detailed introduction to a wind turbine gearbox lubrication system provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A wind power gearbox lubrication system, comprising a mechanical pump (4) arranged on one side of a gearbox (1), a gearbox output shaft (11) being arranged on a side of the gearbox (1) close to the mechanical pump (4), and a mechanical pump input shaft (41) being arranged on a side of the mechanical pump (4) close to the gearbox (1), and being transmission-connected to the gearbox output shaft (11), characterized in that: A speed increasing assembly is connected between the mechanical pump (4) and the gear box (1), the speed increasing assembly comprising a housing (3), a speed increasing gear input shaft (31) arranged on the housing (3) and drivingly connected to the gear box output shaft (11), a speed increasing gear output shaft (33) arranged on the housing (3) and drivingly connected to the mechanical pump input shaft (41), and a speed increasing gear train (32) arranged in the housing (3) and connected between the speed increasing gear input shaft (31) and the speed increasing gear output shaft (33).

2. A wind turbine gearbox lubrication system according to claim 1, characterized in that: A gearbox output flange (13) is provided on a side of the housing (3) close to the gearbox (1); one end of the gearbox output flange (13) is detachably connected to the housing (3), and the other end of the gearbox output flange (13) is detachably connected to the gearbox (1).

3. A wind turbine gearbox lubrication system according to claim 1, characterized in that: A speed increaser output flange (35) is provided on a side of the housing (3) close to the mechanical pump (4); one end of the speed increaser output flange (35) is detachably connected to the housing (3), and the other end of the speed increaser output flange (35) is detachably connected to the mechanical pump (4).

4. A wind turbine gearbox lubrication system according to claim 1, characterized in that: A first coupling (12) is provided between the gearbox output shaft (11) and the speed increaser input shaft (31) so as to achieve transmission connection between the gearbox output shaft (11) and the speed increaser input shaft (31).

5. A wind turbine gearbox lubrication system according to claim 1, characterized in that: A second coupling (34) is provided between the speed increaser input shaft (31) and the speed increaser output shaft (33) so as to achieve transmission connection between the speed increaser input shaft (31) and the speed increaser output shaft (33).

6. A wind turbine gearbox lubrication system according to any one of claims 1-5, characterized in that: The speed-increasing gear train (32) is a fixed-axis gear train or an epicyclic gear train, and the speed-increasing gear train (32) has a speed-increasing ratio ranging from 1:4 to 1:

10.

7. A wind turbine gearbox lubrication system according to any one of claims 1 to 5, characterized in that: The mechanical pump (4) is provided with an oil inlet pipe (43), one end of the oil inlet pipe (43) is connected to the oil outlet of the gear box (1), and the other end of the oil inlet pipe (43) is connected to the oil inlet of the mechanical pump (4); The gear box (1) is provided with an oil distributor (14), the mechanical pump (4) is provided with an oil outlet pipe, one end of the oil outlet pipe is in communication with an oil outlet of the mechanical pump (4), and the other end of the oil outlet pipe is in communication with the oil distributor (14), and a cooling component is provided on the oil outlet pipe, the cooling component is used to cool the lubricating oil in the oil outlet pipe.

8. A wind turbine gearbox lubrication system according to claim 7, characterized in that: The cooling assembly comprises a cooling box (2) arranged on the oil outlet pipe, wherein an air cooler is arranged in the cooling box (2), and the air cooler is used to cool the lubricating oil in the cooling box (2); The oil outlet pipe comprises a first pipe (44) connected to the cooling box (2) and the oil outlet of the mechanical pump (4), and a second pipe (25) connected to the cooling box (2) and the oil distributor (14). An electric pump is arranged in the cooling box (2), and the electric pump is used to transport the lubricating oil flowing through the cooling box (2) to the second pipe (25).

9. A wind turbine gearbox lubrication system according to claim 8, characterized in that: A filter (22) is provided in the cooling box (2), the filter (22) being connected to the first pipe (44), and the filter (22) being used to filter the lubricating oil flowing into the cooling box (2) through the first pipe (44).

10. A wind turbine gearbox lubrication system according to any one of claims 1-5, characterized in that: The mechanical pump (4) is a bidirectional mechanical pump, so that when the wind wheel (5) rotates forward or reverse, the mechanical pump (4) supplies an equal amount of oil in the same direction.

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