Wind turbine gearbox with built-in circulating lubrication pipeline structure

Abstract

The application relates to the field of wind power gearboxes, and discloses a wind power gearbox with a built-in circulating lubricating pipeline structure, which comprises a wind power gearbox and a circulating mechanism arranged on the outer side of the wind power gearbox. The circulating mechanism comprises a fixing assembly arranged on one side of the wind power gearbox, a connecting assembly arranged below the fixing assembly, a residue filtering assembly and a liquid inlet pipe arranged below the connecting assembly, an oil container assembly arranged below the residue filtering assembly and the liquid inlet pipe, and a rotating assembly arranged in the fixing assembly. The spare clean filter screen is cut into the oil circuit by rotating the motor-driven rotating block by 180 degrees, the spare clean filter screen is sealed and docked with the oil leakage hole to restore the filtering function, the switching time is extremely short, and the oil pump does not need to be interrupted for oil supply. The drawbacks that the traditional gearbox must be stopped and disassembled for replacing the filter screen are fundamentally avoided. Clean gas is extracted from the upper part of the oil container assembly by the air pump, the gas flow is sprayed to the annular filter screen, the impurity layer formed on the surface of the filter screen is damaged, and the impurities are stripped.

Description

Technical Field

[0001] This invention relates to the field of wind turbine gearbox technology, specifically to a wind turbine gearbox with a built-in circulating lubrication pipeline structure. Background Technology

[0002] Patent application CN223524391U includes a gearbox and a generator mounted at its rear end. A protective housing is fixed to the right end of the gearbox, and a circulating lubrication pipeline is installed inside the protective housing. The circulating lubrication pipeline includes an oil inlet assembly, a filter element, a pump, and a return assembly. The pump is fixedly installed inside the protective housing, and its upper part is connected to the lower part of the filter element. This wind turbine gearbox with a built-in circulating lubrication pipeline system allows for manual addition of lubricating oil to the gearbox via the oil inlet assembly. Excess lubricating oil drips down to the return assembly and flows back, then is pumped into the filter element for impurity filtration. The filtered lubricating oil then re-enters the gearbox along the oil inlet assembly, thus achieving circulating lubrication. This reduces the frequency of manual lubrication additions and makes the process more convenient for relevant personnel.

[0003] In the aforementioned patents, the filter elements in some existing equipment become clogged after a period of use due to the interception of a large number of impurities, leading to decreased filtration efficiency and increased oil pressure. This necessitates periodic shutdowns for disassembly, cleaning, or replacement of the filter elements. Since wind turbine gearboxes are typically installed in the nacelle at the top of towers tens or even hundreds of meters high, the maintenance space is limited and the operating environment is harsh. Frequent shutdowns for maintenance not only severely impact the power generation efficiency and availability of wind turbine units but also increase maintenance costs and the safety risks of personnel working at heights. Furthermore, existing filter elements cannot effectively adsorb tiny ferromagnetic metal debris generated in the oil due to early failure processes such as fatigue spalling of gear teeth and micro-pitting of bearing rolling elements. Once these hard particles enter the meshing area with the lubricating oil, they accelerate the wear of gears and bearings, shortening the overhaul cycle and service life of the gearbox. Summary of the Invention

[0004] The purpose of this invention is to provide a wind turbine gearbox with a built-in circulating lubrication pipeline structure to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a wind turbine gearbox with a built-in circulating lubrication pipeline structure, including a wind turbine gearbox and a circulation mechanism disposed on the outside of the wind turbine gearbox. The circulation mechanism includes a fixed component disposed on one side of the wind turbine gearbox, a connecting component disposed below the fixed component, a filter assembly and an inlet pipe disposed below the connecting component, an oil container assembly disposed below the filter assembly and the inlet pipe, a rotating component disposed inside the fixed component, and a liquid extraction pipe and a gas pipeline disposed above the fixed component. The fixing component includes a connecting shell, a first connecting plate is provided on one side of the connecting shell, a second connecting hole and a third connecting hole are provided on the upper part of the connecting shell, and an installation cavity is provided in the lower part of the connecting shell.

[0006] Preferably, a motor is installed inside the upper part of the connecting shell, an air pump is installed inside the upper part of the connecting shell and corresponds to the third connecting hole, and a liquid pump is installed inside the upper part of the connecting shell and corresponds to the second connecting hole.

[0007] Preferably, the rotating assembly includes a rotating block rotatably connected to the mounting cavity inside the connecting shell. A connecting vertical rod is fixedly connected above the rotating block. The motor output end inside the connecting shell is fixedly connected to the connecting vertical rod on the rotating block. Two second grooves are formed on the lower outer side of the rotating block. The two second grooves are symmetrically arranged with respect to the axis of the rotating block. Two connecting through holes are formed above the rotating block. The two connecting through holes are respectively connected to the two second grooves. A connecting short tube is fixedly connected to the upper part inside each of the second grooves. A fixing annular plate is fixedly connected to the lower outer side of the connecting short tube. An annular filter is fixedly connected to the lower end of the fixing annular plate. A rubber ring is provided below the annular filter.

[0008] Preferably, the connecting assembly includes a connecting plate fixedly connected to the lower end of the connecting shell, an oil leakage hole corresponding to the second connecting hole, a conical groove below the oil leakage hole, a stop block inside the oil leakage hole, a plurality of connecting crossbars fixedly connected to the outside of the stop block, the other end of the connecting crossbars fixedly connected to the inner wall of the oil leakage hole, an oil drain hole below the conical groove, and a connecting elongated hole corresponding to the third connecting hole on the connecting plate.

[0009] Preferably, the filter cake assembly includes a fixing ring fixedly connected to the bottom of the connecting plate, the fixing ring corresponding to the through hole, the fixing ring having a first thread, an annular rod below the fixing ring, a sliding annular rod below the sliding annular rod, and a fixing post below the sliding annular rod.

[0010] Preferably, a second thread is provided on the upper outer side of the annular rod, and the annular rod is threadedly engaged with the first thread through the second thread. A third thread is provided on the lower outer side of the annular rod. A filter screen is fixedly provided on the lower inner side of the annular rod, and multiple magnet rods are fixedly connected inside the annular rod.

[0011] Preferably, a fourth thread is provided inside the upper part of the sliding annular rod, and the sliding annular rod is threadedly engaged with the third thread through the fourth thread. An annular limiting plate is fixedly connected to the lower part of the outer side of the sliding annular rod.

[0012] Preferably, a first groove is provided above the fixed column, a limiting groove is provided below the first groove, a baffle is fixedly connected to the inner wall of the limiting groove, an oil leakage groove is provided below the limiting groove, the annular limiting plate is slidably disposed in the limiting groove, and a second connecting cross plate is fixedly connected to the outer side of the first groove.

[0013] Preferably, the oil container assembly includes a fixed liquid-containing shell, a filter plate fixedly connected inside the fixed liquid-containing shell, a pump housing disposed on one side of the filter plate, the pump housing being disposed below the interior of the fixed liquid-containing shell, an injection pipe connected to the pump housing, the injection pipe penetrating the fixed liquid-containing shell and connecting to a first connecting hole, a gas pipe and an inlet pipe fixedly connected to the upper end of the fixed liquid-containing shell, the gas pipe and the inlet pipe being in continuous connection with the interior of the fixed liquid-containing shell, the other end of the inlet pipe being fixedly connected to the lower end of a connecting plate, the inlet pipe corresponding to an oil drain hole, the other end of the gas pipe corresponding to a third connecting hole, and a suction pipe fixedly connected above the connecting shell.

[0014] Preferably, the wind turbine gearbox includes a wind turbine gearbox housing, on which two first connection holes are provided. The two first connection holes are respectively provided on the upper and lower sides of the wind turbine gearbox housing. One end of the liquid extraction pipe is connected to the first connection hole provided on the lower side of the wind turbine gearbox housing, and the other end of the liquid injection pipe is connected to the first connection hole provided on the upper side of the wind turbine gearbox housing.

[0015] Compared with the prior art, the technical solution of the present invention has the following advantages: (1) This application constructs a system that completes filter screen switching and cleaning in full-speed operation of the gearbox by using a rotating component driven by a motor inside the fixed component and an air pump. After the working position filter screen has been used for a period of time, the control system controls the motor to drive the rotating block to rotate 180 degrees, so that the spare clean filter screen can be cut into the oil circuit, form a sealed connection with the oil leakage hole and restore the filtering function. The switching time is extremely short and there is no need to interrupt the oil pump supply. This fundamentally avoids the disadvantage of the traditional gearbox having to stop and disassemble in order to replace the filter screen. The air pump draws clean gas from the top of the oil container component and sprays intermittent high-pressure pulse airflow onto the annular filter screen through the third connecting hole, the connecting long hole and the corresponding cleaning position connecting through hole and connecting short pipe. This destroys the impurity layer formed on the surface of the filter screen and peels off the tiny particles embedded deep in the mesh and the oil sludge, metal dust and other impurities adhering to the outside of the filter screen. (2) The blown-off material of this application immediately descends along the cleaning chamber and enters the filter slag assembly. The entire cleaning process is completely isolated from the main lubricating oil circuit and will not cause any disturbance to the working clean oil. Moreover, the back-blowing gas is taken from and returned to the upper space of the closed oil container to form an internal circulation. This not only avoids the environmental pollution and safety risks caused by oil mist leakage, but also eliminates the problem of external humid air entering the system and causing the lubricating oil to emulsify and deteriorate. The annual maintenance frequency of the gearbox is greatly reduced, which improves the availability and power generation economic benefits of the wind turbine. Multiple magnetic rods are fixedly installed inside the annular rod. These magnetic rods generate a strong magnetic field area and actively adsorb ferromagnetic metal debris in the oil. These debris mainly come from early failure processes such as fatigue spalling of gear teeth and micro-pitting of bearing rolling elements. They are extremely hard and have a small particle size, which is difficult for conventional filters to effectively capture, thus extending the gearbox overhaul cycle. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the wind turbine gearbox structure of the present invention; Figure 3 This is a schematic diagram of the circulation mechanism structure of the present invention; Figure 4 This is a schematic diagram of the circulating mechanism of the present invention; Figure 5 This is a schematic diagram of the fixed component structure of the present invention; Figure 6 This is a schematic diagram of the disassembled structure of the circulation mechanism of the present invention; Figure 7 This is a schematic diagram of the rotating component structure of the present invention; Figure 8 This is a schematic diagram of the connection component structure of the present invention; Figure 9 This is a schematic diagram of the filter cake assembly structure of the present invention; Figure 10 This is a schematic diagram of the filter cake assembly structure of the present invention; Figure 11 This is a schematic diagram of the oil container assembly structure of the present invention; Figure 12 This is a schematic diagram of the internal structure of the oil container assembly of the present invention.

[0017] In the diagram: 1. Wind turbine gearbox; 11. Wind turbine gearbox housing; 12. First connecting hole; 2. Circulation mechanism; 21. Fixing assembly; 211. Connecting shell; 212. First connecting cross plate; 213. Second connecting hole; 214. Third connecting hole; 22. Connecting assembly; 221. Connecting plate; 222. Oil leakage hole; 223. Conical groove; 224. Oil drain hole; 225. Stop block; 226. Connecting cross bar; 227. Communicating elongated hole; 23. Filter assembly; 231. Fixing ring; 2311. First thread; 232. Annular long bar; 2321. Second thread; 2322. Third thread; 233. Sliding... 2331. Annular long rod; 2332. Fourth thread; 2333. Annular limiting plate; 234. Fixed column; 2341. First groove; 2342. Limiting slide groove; 2343. Baffle; 2344. Oil leakage groove; 2345. Second connecting horizontal plate; 24. Oil container assembly; 241. Fixed liquid shell; 242. Liquid injection pipe; 243. Filter plate; 244. Liquid pump housing; 25. Rotating assembly; 251. Rotating block; 252. Second groove; 253. Connecting through hole; 254. Connecting short pipe; 255. Fixed annular plate; 256. Annular filter screen; 26. Liquid extraction pipe; 27. Gas pipeline; 28. Liquid inlet pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0019] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0020] like Figures 1 to 12As shown, the present invention provides a wind turbine gearbox with a built-in circulating lubrication pipeline structure, including a wind turbine gearbox 1 and a circulation mechanism 2 disposed on the outside of the wind turbine gearbox 1. The circulation mechanism 2 includes a fixing component 21 disposed on one side of the wind turbine gearbox 1, a connecting component 22 disposed below the fixing component 21, a filter assembly 23 and an inlet pipe 28 disposed below the connecting component 22, an oil container assembly 24 disposed below the filter assembly 23 and the inlet pipe 28, a rotating component 25 disposed inside the fixing component 21, and a liquid extraction pipe 26 and a gas pipe 27 disposed above the fixing component 21. The fixing component 21 includes a connecting shell 211, a first connecting plate 212 is provided on one side of the connecting shell 211, a second connecting hole 213 and a third connecting hole 214 are provided on the upper part of the connecting shell 211, and an installation cavity is provided in the lower part of the connecting shell 211.

[0021] A motor is installed inside the upper part of the connecting shell 211, an air pump is installed inside the upper part of the connecting shell 211, the air pump corresponds to the third connecting hole 214, and a liquid pump is installed inside the upper part of the connecting shell 211, the liquid pump corresponds to the second connecting hole 213.

[0022] The rotating assembly 25 includes a rotating block 251 rotatably connected to the mounting cavity inside the connecting shell 211. A connecting vertical rod is fixedly connected to the top of the rotating block 251. The motor output end inside the connecting shell 211 is fixedly connected to the connecting vertical rod on the rotating block 251. Two second grooves 252 are opened on the lower outer side of the rotating block 251. The two second grooves 252 are symmetrically arranged with respect to the axis of the rotating block 251. Two connecting through holes 253 are opened on the top of the rotating block 251. The two connecting through holes 253 are respectively connected to the two second grooves 252. A connecting short tube 254 is fixedly connected to the upper inside of each second groove 252. A fixing annular plate 255 is fixedly connected to the lower outer side of the connecting short tube 254. An annular filter screen 256 is fixedly connected to the lower end of the fixing annular plate 255. A rubber ring is provided below the annular filter screen 256.

[0023] The connecting assembly 22 includes a connecting plate 221 fixedly connected to the lower end of the connecting shell 211. The connecting plate 221 has an oil leakage hole 222, which corresponds to the second connecting hole 213. A conical groove 223 is provided below the oil leakage hole 222. A stop block 225 is provided inside the oil leakage hole 222. Multiple connecting crossbars 226 are fixedly connected to the outside of the stop block 225. The other end of the connecting crossbars 226 is fixedly connected to the inner wall of the oil leakage hole 222. An oil drain hole 224 is provided below the conical groove 223. A connecting elongated hole 227 corresponding to the third connecting hole 214 is provided on the connecting plate 221.

[0024] The filter cake assembly 23 includes a fixing ring 231 fixedly connected to the bottom of the connecting plate 221. The fixing ring 231 corresponds to the through elongated hole 227. A first thread 2311 is provided inside the fixing ring 231. An annular rod 232 is provided below the fixing ring 231. A sliding annular rod 233 is provided below the annular rod 232. A fixing post 234 is provided below the sliding annular rod 233.

[0025] A second thread 2321 is provided on the upper outer side of the annular rod 232. The annular rod 232 is threadedly engaged with the first thread 2311 through the second thread 2321. A third thread 2322 is provided on the lower outer side of the annular rod 232. A filter screen is fixedly installed inside the lower part of the annular rod 232. Multiple magnetic rods are fixedly connected inside the annular rod 232. The magnetic rods are used to adsorb metal debris in the oil.

[0026] The sliding annular rod 233 has a fourth thread 2331 inside and above. The sliding annular rod 233 is threaded with the third thread 2322 through the fourth thread 2331. An annular limiting plate 2332 is fixedly connected to the lower outer side of the sliding annular rod 233. When it is necessary to clean the impurities inside the annular rod 232, rotate the annular rod 232 to separate the annular rod 232 from the fixed ring 231 and fix the annular rod 232. Then rotate the sliding annular rod 233 to separate the annular rod 232 from the sliding annular rod 233 and disassemble the annular rod 232 for cleaning.

[0027] A first groove 2341 is provided above the fixed column 234, a limiting groove 2342 is provided below the first groove 2341, a baffle 2343 is fixedly connected to the inner wall of the limiting groove 2342, an oil leakage groove 2344 is provided below the limiting groove 2342, an annular limiting plate 2332 is slidably disposed in the limiting groove 2342, and a second connecting horizontal plate 2345 is fixedly connected to the outer side of the first groove 2341.

[0028] The oil container assembly 24 includes a fixed liquid container shell 241. The lower part of the fixed liquid container shell 241 contains oil, and a cleaning gas is provided at the upper part of the interior. A filter plate 243 is fixedly connected inside the fixed liquid container shell 241. A liquid pump housing 244 is provided on one side of the filter plate 243. The liquid pump housing 244 is located inside the lower part of the fixed liquid container shell 241. An injection pipe 242 is connected to the liquid pump housing 244. The injection pipe 242 passes through the fixed liquid container shell 241 and is connected to the first connection hole 12. A gas pipe 27 and a liquid inlet pipe 28 are fixedly connected to the upper end of the fixed liquid container shell 241, and the gas pipe 27 and the liquid inlet pipe 28 are connected to the interior of the fixed liquid container shell 241. The other end of the liquid inlet pipe 28 is fixedly connected to the lower end of the connecting plate 221. The liquid inlet pipe 28 corresponds to the oil drain hole 224. The other end of the gas pipe 27 corresponds to the third connection hole 214. A liquid extraction pipe 26 is fixedly connected to the upper part of the connecting shell 211.

[0029] The wind turbine gearbox 1 includes a wind turbine gearbox housing 11. Two first connection holes 12 are provided on the wind turbine gearbox housing 11. The two first connection holes 12 are respectively provided on the upper and lower sides of the wind turbine gearbox housing 11. One end of the liquid extraction pipe 26 is connected to the first connection hole 12 provided on the lower side of the wind turbine gearbox housing 11, and the other end of the liquid injection pipe 242 is connected to the first connection hole 12 provided on the upper side of the wind turbine gearbox housing 11.

[0030] The working principle of the present invention is as follows: The liquid pump located above the connecting shell 211 is started, and the lubricating oil containing impurities below the wind turbine gearbox housing 11 is drawn out through the liquid extraction pipe 26. The dirty oil enters the interior through the second connecting hole 213 of the connecting shell 211, and flows into a second groove 252 that is connected to the connecting through hole 253 on the rotating block 251. At this time, the connecting short pipe 254 below the second groove 252 is in a sealed docking state with the oil leakage hole 222 on the connecting plate 221. Under pressure, the dirty oil must pass through the annular filter screen 256 fixed below the connecting short pipe 254. The filter screen intercepts solid particles, metal fragments and other impurities in the oil inside the filter screen. The clean oil flows out through the filter screen. The filtered clean oil flows into the liquid inlet pipe 28 through the oil leakage hole 222 of the connecting plate 221, the conical groove 223 below and the oil drain hole 224, and finally enters the fixed liquid container shell 241 of the oil container assembly 24. Then, the liquid pump shell 244 inside the fixed liquid container shell 241 pressurizes the clean oil and injects the clean lubricating oil back into the top of the gearbox through the liquid injection pipe 242 and the first connecting hole 12 above the wind power gearbox shell 11, completing a purification cycle. The annular filter 256 traps impurities during use. After a period of time, a cleaning program is initiated. This process does not require stopping the machine. The motor inside the connecting housing 211 starts, driving the rotating block 251 to rotate 180 degrees. Due to the symmetrical arrangement of the two second grooves 252, the dirty filter screen, which was originally in the working position, is rotated to the cleaning position. Meanwhile, the spare clean filter screen, which was originally in the cleaning position, rotates synchronously to the working position and connects with the oil drain hole 222, instantly restoring the filtration function and ensuring that the gearbox continuously receives clean oil. The air pump located above the connecting housing 211 starts. The air pump draws gas from the upper part of the oil container through the third connecting hole 214 and the connecting elongated hole 227 on the connecting plate 221. After pressurizing the gas, it sprays pulsed gas through the connecting through hole 253 and connecting short pipe 254 on the rotating block 251 corresponding to the cleaning position. The high-pressure gas blows off the impurities attached to the annular filter 256. These impurities mixed with oil are blown off along the cleaning... The oil flows downwards through the connecting elongated hole 227 on the connecting plate 221 into the filter assembly 23. Impurities and oil mist enter the interior of the annular rod 232. Larger impurity particles settle to the bottom under gravity. When the oil flows through the interior of the annular rod 232, the magnetic rod strongly attracts ferromagnetic metal debris, preventing it from recirculating. The final oil-gas mixture is filtered by the filter screen at the bottom of the annular rod 232. Clean lubricating oil drips through the first groove 2341, the limiting slide groove 2342, and the oil leakage groove 2344 of the fixed column 234, and flows into the oil container assembly 24 below for recycling. The filtered dry impurities are intercepted in the filter assembly 23. The air pump draws in air from above the oil container assembly 24. The backflushed air returns to above the oil container assembly 24, forming a closed internal circulation, which avoids oil mist leakage and pollution, and also prevents external moisture from entering the oil.

[0031] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A wind turbine gearbox with a built-in circulating lubrication pipeline structure, comprising a wind turbine gearbox (1) and a circulation mechanism (2) disposed outside the wind turbine gearbox (1), characterized in that: The circulation mechanism (2) includes a fixed component (21) disposed on one side of the wind turbine gearbox (1), a connecting component (22) disposed below the fixed component (21), a filter assembly (23) and an inlet pipe (28) disposed below the connecting component (22), an oil container assembly (24) disposed below the filter assembly (23) and the inlet pipe (28), a rotating component (25) disposed inside the fixed component (21), and a suction pipe (26) and a gas pipe (27) disposed above the fixed component (21). The fixing component (21) includes a connecting shell (211), a first connecting horizontal plate (212) is provided on one side of the connecting shell (211), a second connecting hole (213) and a third connecting hole (214) are provided on the top of the connecting shell (211), and an installation cavity is provided inside the lower part of the connecting shell (211); the rotating component (25) includes a rotating block (251) rotatably connected to the installation cavity inside the connecting shell (211), a connecting vertical rod is fixedly connected to the top of the rotating block (251), the motor output end inside the upper part of the connecting shell (211) is fixedly connected to the connecting vertical rod on the rotating block (251), and an opening is provided on the lower part of the outer side of the rotating block (251). Two second grooves (252) are provided, and the two second grooves (252) are symmetrically arranged with respect to the axis of the rotating block (251). Two connecting through holes (253) are opened on the top of the rotating block (251). The two connecting through holes (253) are respectively connected to the two second grooves (252). A connecting short tube (254) is fixedly connected to the upper part of each second groove (252). A fixed annular plate (255) is fixedly connected to the outer side of the lower end of the connecting short tube (254). An annular filter (256) is fixedly connected to the lower end of the fixed annular plate (255). A rubber ring is provided below the annular filter (256).

2. The wind turbine gearbox with a built-in circulating lubrication pipeline structure according to claim 1, characterized in that: A motor is provided inside the upper part of the connecting shell (211), an air pump is provided inside the upper part of the connecting shell (211), the air pump corresponds to the third connecting hole (214), and a liquid pump is provided inside the upper part of the connecting shell (211), the liquid pump corresponds to the second connecting hole (213).

3. The wind turbine gearbox with a built-in circulating lubrication pipeline structure according to claim 1, characterized in that: The connecting assembly (22) includes a connecting plate (221) fixedly connected to the lower end of the connecting shell (211). The connecting plate (221) has an oil leakage hole (222) which corresponds to the second connecting hole (213). A conical groove (223) is provided below the oil leakage hole (222). A stop block (225) is provided inside the oil leakage hole (222). Multiple connecting crossbars (226) are fixedly connected to the outside of the stop block (225). The other end of the connecting crossbar (226) is fixedly connected to the inner wall of the oil leakage hole (222). An oil drain hole (224) is provided below the conical groove (223). A connecting elongated hole (227) corresponding to the third connecting hole (214) is provided on the connecting plate (221).

4. The wind turbine gearbox with a built-in circulating lubrication pipeline structure according to claim 3, characterized in that: The filter cake assembly (23) includes a fixing ring (231) fixedly connected to the bottom of the connecting plate (221). The fixing ring (231) corresponds to the through hole (227). A first thread (2311) is provided in the fixing ring (231). An annular rod (232) is provided below the fixing ring (231). A sliding annular rod (233) is provided below the annular rod (232). A fixing post (234) is provided below the sliding annular rod (233).

5. A wind turbine gearbox with a built-in circulating lubrication pipeline structure according to claim 4, characterized in that: The annular rod (232) has a second thread (2321) on its upper outer side. The annular rod (232) is threaded with the first thread (2311) through the second thread (2321). The annular rod (232) has a third thread (2322) on its lower outer side. A filter screen is fixedly installed inside the annular rod (232). Multiple magnet rods are fixedly connected inside the annular rod (232).

6. A wind turbine gearbox with a built-in circulating lubrication pipeline structure according to claim 5, characterized in that: The sliding annular rod (233) has a fourth thread (2331) inside and above. The sliding annular rod (233) is threaded with the third thread (2322) through the fourth thread (2331). An annular limiting plate (2332) is fixedly connected to the lower outer side of the sliding annular rod (233).

7. A wind turbine gearbox with a built-in circulating lubrication pipeline structure according to claim 6, characterized in that: A first groove (2341) is provided above the fixed column (234), a limiting groove (2342) is provided below the first groove (2341), a baffle (2343) is fixedly connected to the inner wall of the limiting groove (2342), an oil leakage groove (2344) is provided below the limiting groove (2342), the annular limiting plate (2332) is slidably disposed in the limiting groove (2342), and a second connecting cross plate (2345) is fixedly connected to the outer side of the first groove (2341).

8. A wind turbine gearbox with a built-in circulating lubrication pipeline structure according to claim 7, characterized in that: The oil container assembly (24) includes a fixed liquid container shell (241), a filter plate (243) is fixedly connected inside the fixed liquid container shell (241), a pump housing (244) is provided on one side of the filter plate (243), the pump housing (244) is located inside the fixed liquid container shell (241) and below, an injection pipe (242) is connected to the pump housing (244), the injection pipe (242) passes through the fixed liquid container shell (241) and connects to the first connection hole (12), the gas... The gas pipe (27) and the liquid inlet pipe (28) are fixedly connected to the upper end of the fixed liquid container (241). The gas pipe (27) and the liquid inlet pipe (28) are connected to the inside of the fixed liquid container (241). The other end of the liquid inlet pipe (28) is fixedly connected to the lower end of the connecting plate (221). The liquid inlet pipe (28) corresponds to the oil drain hole (224). The other end of the gas pipe (27) corresponds to the third connecting hole (214). A liquid extraction pipe (26) is fixedly connected above the connecting shell (211).

9. A wind turbine gearbox with a built-in circulating lubrication pipeline structure according to claim 8, characterized in that: The wind turbine gearbox (1) includes a wind turbine gearbox housing (11), on which two first connection holes (12) are provided. The two first connection holes (12) are respectively provided on the upper and lower sides of the wind turbine gearbox housing (11). One end of the liquid extraction pipe (26) is connected to the first connection hole (12) provided on the lower side of the wind turbine gearbox housing (11), and the other end of the liquid injection pipe (242) is connected to the first connection hole (12) provided on the upper side of the wind turbine gearbox housing (11).

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