Wind power hydraulic oil filter device

Abstract

This invention belongs to the field of hydraulic oil filtration technology, specifically referring to a wind power hydraulic oil filtration device. It includes a filter box with a centrifugal scraper rotating at its top. A self-closing air flotation unit is arrayed in the upper middle part of the filter box, and an ultrafiltration membrane assembly is located at the bottom of the filter box. A pressure pump is connected to the ultrafiltration membrane assembly. The self-closing air flotation unit of this invention can adaptively close or open according to the hydraulic oil height, thereby injecting gas into the hydraulic oil to cause large particles of impurities to float to the surface. These impurities are then separated by a multi-stage separation system, improving filtration efficiency and reducing clogging.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic oil filtering, and specifically refers to a wind power hydraulic oil filtering device. Background Art

[0002] Wind power hydraulic system is a special hydraulic equipment. The cleanliness of hydraulic oil inside the wind turbine seriously affects the safety of the wind power system. When there are many impurities in the hydraulic oil, it may cause oil circuit blockage and increase the local pressure of the hydraulic system. In serious cases, it may cause equipment damage and threaten personal safety.

[0003] When operating, wind power hydraulic oil needs to pass through various hydraulic pumps, hydraulic pipelines, oil tanks, electro-hydraulic reversing valves, hydraulic controllers and actuators, etc. The above products involve cutting, welding, assembly, cleaning and other processes during the production process.

[0004] Welding scale may be produced during welding; insufficient protection before product assembly or high humidity will also increase the risk of corrosion. After repeated flushing of high-pressure liquid in the hydraulic system, welding scale or rust will fall off the inner wall of the pipeline and move to various areas of the wind power system with the hydraulic oil. In severe cases, it will block the valve body or pipeline, causing local pressure increase and affecting the normal operation of wind power.

[0005] However, impurities such as oxide scale and rust cannot be absorbed by magnetic materials and cannot be screened by magnetic filtration. Therefore, they are filtered through filters, which are easily blocked by such large particles. The wind power system consumes a large amount of hydraulic oil and requires frequent filter replacement.

[0006] At the same time, due to the structural and production process limitations of the hydraulic oil tank, the rust and particulate impurities in the oil tank will be much greater than the impurities such as oxide scale inside the pipeline, and the impact on the hydraulic system will be even greater. Summary of the invention

[0007] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a wind power hydraulic oil filter device, which at least partially solves the above problems.

[0008] The technical solution adopted by the present invention is as follows: the present invention proposes a wind power hydraulic oil filter device, which includes a filter box. The hydraulic oil is poured into the filter box from the top and poured out from the bottom after being filtered and qualified.

[0009] Furthermore, a centrifugal scraper is rotatably provided at the top of the filter box, and the end of the centrifugal scraper is connected to a power device. The centrifugal scraper is used to scrape impurities on the surface of the hydraulic oil.

[0010] Furthermore, a self-closing air flotation machine is provided in the middle and upper array of the filter box. A plurality of self-closing air flotation machines are evenly distributed in the horizontal and height directions. The self-closing air flotation machine can introduce gas into the hydraulic oil so that impurities in the hydraulic oil adhere to the gas and float to the surface of the hydraulic oil so that the centrifugal scraper can scrape off the impurities. The self-closing air flotation machine can also automatically open or close the air path according to the changes in the liquid level of the hydraulic oil to prevent air blowing from affecting the impurities on the scraper.

[0011] Furthermore, in order to better remove fine impurities in the hydraulic oil, an ultrafiltration membrane group is provided at the bottom of the filter box, and a pressure pump is connected to the ultrafiltration membrane group. The liquid filtered above is pressurized by the pressure pump and enters the ultrafiltration membrane group for filtration, so that hydraulic oil with higher cleanliness can be obtained.

[0012] Furthermore, in order to fill each group of self-closing air flotation machines with gas, an air inlet pipe assembly is connected to the end of the self-closing air flotation machine, and all the self-closing air flotation machines are connected to an external air source through the air inlet pipe assembly.

[0013] Furthermore, a positioning platform is symmetrically provided at the center of the upper wall of the filter box, a positioning hole is provided at the center of the positioning platform, and both ends of the centrifugal scraper are hinged in the positioning hole.

[0014] Furthermore, a variable diameter arc plate is fixed to the side wall of the upper end of the filter box, and the variable diameter arc plate is adapted to the radius of the centrifugal scraper. The root array of the variable diameter arc plate is provided with a separation groove. The variable diameter arc plate can scrape off the scum in the filter box when rotating. Under the action of centrifugal force, the scum is thrown away from the rotating shaft of the centrifugal scraper and is intercepted by the variable diameter arc plate, so that the impurities finally fall off from the separation groove.

[0015] Furthermore, a coarse filter is provided in the middle and upper part of the filter box, which is used for preliminary filtering of the hydraulic oil. A fine filter is provided in the middle part of the filter box, which is used for secondary filtering of the hydraulic oil. An inclined plate is provided in the middle and lower part of the filter box, and a leakage hole is provided at the lower end of the inclined plate. The inclined plate tilts the filtered hydraulic oil to one end so as to guide the hydraulic oil to the bottom through the leakage hole. A lower bracket is provided at the bottom of the filter box, and the ultrafiltration membrane group is arranged on the lower bracket. The multi-stage filtration system composed of the coarse filter, the fine filter and the ultrafiltration membrane group can separate different impurities, which can not only avoid blockage but also improve the filtration efficiency.

[0016] Furthermore, a drainage hole is provided on the bottom side wall of the filter box, and the drainage hole guides the filtered hydraulic oil to the outside for subsequent use.

[0017] Furthermore, a top array of side walls of the filter box is provided with fixing holes, and the self-closing air flotation machine is arranged in the fixing holes.

[0018] Furthermore, a connecting hole 1 and a connecting hole 2 are provided in the middle of the side wall of the filter box, the connecting hole 1 is provided above the inclined plate, and the connecting hole 2 is provided below the inclined plate, the connecting hole 1 and the connecting hole 2 are connected through a pressure pump, and the connecting hole 1 and the connecting hole 2 guide the hydraulic oil above the inclined plate to the ultrafiltration membrane group below the inclined plate, and increase the pressure of the hydraulic oil so as to filter impurities from the ultrafiltration membrane subsequently.

[0019] Furthermore, the centrifugal scraper is composed of a plurality of sets of plates arranged at intervals, and the self-closing air flotation machine is arranged between the gaps between the plates.

[0020] Furthermore, the self-closing air flotation machine includes an air flotation tube, an opening and closing valve and a spring. The air flotation tube is arranged in a fixed hole on the filter box, the air intake pipe assembly is connected to the air flotation tube, the opening and closing valve slides through the air flotation tube, and the spring is connected between the opening and closing valve and the air flotation tube. When the opening and closing valve is inside the hydraulic oil, the opening and closing valve rises due to the buoyancy and connects the air flotation tube front to back. When the opening and closing valve is above the liquid surface of the hydraulic oil, the opening and closing valve is no longer affected by the buoyancy, the air flotation tube is disconnected front to back, and the internal gas no longer circulates.

[0021] Furthermore, in order to allow external gas to flow into the hydraulic oil and make the gas adhere to the impurities for easy removal, the air flotation tube is provided with an array of air flotation holes.

[0022] Furthermore, in order to enable the opening and closing valve to rise according to the liquid level, the opening and closing valve includes a sealing plate with a hole, a lifting rod and a hydraulic float. The lifting rod slides up and down in the side wall of the air flotation tube, the hydraulic float is arranged at the upper end of the lifting rod, and the sealing plate with a hole is arranged at the lower end of the lifting rod. The buoyancy of the hydraulic float sinking into the hydraulic oil can overcome the resistance of the spring, so that the sealing plate with a hole moves upward.

[0023] Furthermore, a fixing platform is provided on the air flotation tube, a second sealing plate with holes is provided below the fixing platform, and a lifting groove is provided on the side wall of the second sealing plate with holes.

[0024] Furthermore, the lifting rod is penetrated in the fixed platform, and the perforated sealing plate 1 fits the perforated sealing plate 2 and slides up and down in the lifting groove.

[0025] Furthermore, in order to control the connection and disconnection of the front and rear of the air flotation tube by the lifting and lowering of the opening and closing valve, the first perforated sealing plate is provided with a first vent hole, and the second perforated sealing plate is provided with a second vent hole. The positions of the first vent hole and the second vent hole are adapted. When the opening and closing valve rises, the first vent hole and the second vent hole overlap each other, and the front and rear of the air flotation tube are connected. When the opening and closing valve is lowered, the first vent hole and the second vent hole are completely staggered, and the front and rear of the air flotation tube are disconnected.

[0026] When the flotation tubes are disconnected at the front and rear ends, the flotation holes no longer blow air upwards, and the gas will not directly act on the centrifugal scraper to prevent the impurities above from being blown off.

[0027] The beneficial effects achieved by the present invention using the above structure are as follows:

[0028] 1. The self-closing air flotation machine can spray gas into the oil, so that the gas adheres to the large particles in the hydraulic oil and lifts the large particles upward so that the centrifugal scraper can scrape off the large particles;

[0029] 2. The on-off valve on the self-closing air flotation machine can be closed or opened adaptively according to the height of the hydraulic oil. When the hydraulic float exceeds the liquid surface, the self-closing air flotation machine is closed, and when the hydraulic float is below the liquid surface, the self-closing air flotation machine is opened, thereby preventing the gas from directly acting on the centrifugal scraper, causing the impurities on the centrifugal scraper to be blown off;

[0030] 3. When the centrifugal scraper rotates, it scrapes up large particles, which will be thrown to the variable diameter arc plate and separated under the action of centrifugal force;

[0031] 4. The multi-stage separation system can separate impurities of different diameters, which can avoid blockage and improve filtration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A partial cross-sectional view of

[0034] Figure 3 is a cross-sectional view of the filter box;

[0035] Figure 4 It is the position relationship diagram of the air intake pipe assembly, the self-closing air flotation machine and the centrifugal scraper;

[0036] Figure 5 A fracture view of a cross-sectional view of a self-closing air flotation machine;

[0037] Figure 6 It is a structural schematic diagram of the on-off valve;

[0038] Figure 7 A fracture view of a cross-sectional view of the flotation tube.

[0039] Among them, 1. filter box, 2. self-closing flotation machine, 3. centrifugal scraper, 4. ultrafiltration membrane group, 5. pressure pump, 6. intake pipe assembly, 7. positioning platform, 8. positioning hole, 9. variable diameter arc plate, 10. separation tank, 11. coarse filter screen, 12. fine filter screen, 13. inclined plate, 14. lower bracket, 15. leakage hole, 16. drainage hole, 17. connecting hole one, 18. connecting hole two, 19. fixing hole, 20. flotation tube, 21. opening and closing valve, 22. spring, 23. sealing plate with holes one, 24. lifting rod, 25. hydraulic floating plate, 26. vent hole one, 27. sealing plate with holes two, 28. fixed platform, 29. lifting tank, 30. vent hole two, 31. flotation hole.

[0040] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0043] like Figure 1 and Figure 2 As shown, a wind power hydraulic oil filter device proposed by the present invention comprises a filter box 1. The hydraulic oil is poured into the filter box 1 from the top and poured out from the bottom after being filtered and qualified.

[0044] A centrifugal scraper 3 is rotatably provided at the top of the filter box 1, and a power device (not shown in the drawings) is connected to the end of the centrifugal scraper 3. The centrifugal scraper 3 is used to scrape impurities on the surface of the hydraulic oil.

[0045] A self-closing air flotation machine 2 is arranged in an array in the middle and upper part of the filter box 1. A plurality of groups of the self-closing air flotation machines 2 are evenly arranged in the horizontal direction and the height direction. The self-closing air flotation machine 2 can introduce gas into the hydraulic oil so that impurities in the hydraulic oil adhere to the gas and float to the surface of the hydraulic oil so that the centrifugal scraper 3 can scrape off the impurities. The self-closing air flotation machine 2 can also automatically open or close the air path according to the changes in the liquid level of the hydraulic oil to prevent air blowing from affecting the impurities on the scraper.

[0046] In order to better remove fine impurities in the hydraulic oil, an ultrafiltration membrane group 4 is provided at the bottom of the filter box 1, and a pressure pump 5 is connected to the ultrafiltration membrane group 4. The liquid filtered from the top is pressurized by the pressure pump 5 and enters the ultrafiltration membrane group 4 for filtration, so as to obtain hydraulic oil with higher cleanliness.

[0047] In order to fill each group of self-closing air floatation machines 2 with gas, an air inlet pipe assembly 6 is connected to the end of the self-closing air floatation machine 2 , and all the self-closing air floatation machines 2 are connected to an external air source through the air inlet pipe assembly 6 .

[0048] In this embodiment, after the hydraulic oil of the wind power system is released, it is continuously poured into the filter box 1 , and gas is introduced into the air intake pipe assembly 6 at the same time.

[0049] The air source enters the self-closing air flotation machine 2 from the air inlet pipe assembly 6. When the liquid level of the hydraulic oil exceeds the self-closing air flotation machine 2, the self-closing air flotation machine 2 opens and blows gas into the hydraulic oil. The gas adheres to the large particles of impurities in the hydraulic oil and drives the large particles of impurities above the liquid level.

[0050] When the impurities float to the liquid surface, the centrifugal scraper 3 rotates synchronously under the action of the power device, thereby rotating and scraping off the impurities on the liquid surface.

[0051] When the height of the self-closing air flotation machine 2 is higher than the liquid level of the hydraulic oil, the self-closing air flotation machine 2 is in a closed state and can no longer blow gas outward, thereby preventing the gas from directly acting on the centrifugal scraper 3, causing impurities to fall into the hydraulic oil again.

[0052] like Figure 2 and Figure 3 As shown, a positioning platform 7 is symmetrically provided at the center of the upper wall of the filter box 1 , a positioning hole 8 is provided at the center of the positioning platform 7 , and both ends of the centrifugal scraper 3 are hinged in the positioning hole 8 .

[0053] A reducing arc plate 9 is fixed to the side wall of the upper end of the filter box 1. The reducing arc plate 9 is adapted to the radius of the centrifugal scraper 3. The root array of the reducing arc plate 9 is provided with a separation groove 10. The centrifugal scraper 3 can scrape off the scum in the filter box 1 when rotating. Under the action of centrifugal force, the scum is thrown away from the rotating axis of the centrifugal scraper 3 and is intercepted by the reducing arc plate 9, so that the impurities finally fall off from the separation groove 10.

[0054] A coarse filter 11 is provided in the middle and upper part of the filter box 1, and the coarse filter 11 is used for preliminary filtering of the hydraulic oil. A fine filter 12 is provided in the middle part of the filter box 1, and the fine filter 12 is used for secondary filtering of the hydraulic oil. An inclined plate 13 is provided in the middle and lower part of the filter box 1, and a leakage hole 15 is provided at the lower end of the inclined plate 13. The inclined plate 13 tilts the filtered hydraulic oil to one end so as to guide the hydraulic oil to the bottom through the leakage hole 15. A lower bracket 14 is provided at the bottom of the filter box 1, and an ultrafiltration membrane group 4 is arranged on the lower bracket 14. The multi-stage filtration system composed of the coarse filter 11, the fine filter 12 and the ultrafiltration membrane group 4 can separate different impurities, which can not only avoid blockage but also improve the filtration efficiency.

[0055] The bottom side wall of the filter box 1 is provided with a drainage hole 16, and the drainage hole 16 guides the filtered hydraulic oil to the outside for subsequent use.

[0056] The top of the side wall of the filter box 1 is provided with a fixing hole array 19 , and the self-closing air flotation machine 2 is arranged in the fixing hole 19 .

[0057] A connecting hole 17 and a connecting hole 2 18 are provided in the middle of the side wall of the filter box 1. The connecting hole 17 is provided above the inclined plate 13, and the connecting hole 2 18 is provided below the inclined plate 13. The connecting hole 17 and the connecting hole 2 18 are connected through the pressure pump 5. The connecting hole 17 and the connecting hole 2 18 guide the hydraulic oil above the inclined plate 13 to the ultrafiltration membrane group 4 below the inclined plate 13, and increase the pressure of the hydraulic oil so as to filter impurities from the ultrafiltration membrane subsequently.

[0058] In this embodiment, when the centrifugal scraper 3 rotates, the impurities on the centrifugal scraper 3 are simultaneously subjected to centrifugal force and move in the direction away from the rotation axis. When the impurities are separated from the centrifugal scraper 3, they will be blocked by the reducing arc plate 9 to prevent the impurities from polluting the surrounding environment. The impurities will eventually slide to the root along the contour of the reducing arc plate 9 and fall to the bottom from the separation groove 10 at the root.

[0059] Then, the hydraulic oil processed by the centrifugal scraper 3 passes through the coarse filter 11 to achieve primary filtration, and the hydraulic oil after the primary filtration is then filtered for a second time by the fine filter 12.

[0060] The hydraulic oil after secondary filtration moves to the leak hole 15 along the slope direction of the inclined plate 13, and is then transported to the ultrafiltration membrane group 4 by the pressure pump 5. At this time, the pressure of the hydraulic oil is relatively high, and it will seep out from the ultrafiltration membrane group 4 and filter out fine impurities, thereby obtaining hydraulic oil that meets the cleanliness load requirements.

[0061] The treated hydraulic oil can be discharged from the drain hole 16.

[0062] like Figure 4 As shown, the centrifugal scraper 3 is composed of a plurality of sets of plates arranged at intervals, and the self-closing air flotation machine 2 is arranged between the gaps of the plates.

[0063] like Figure 5-Figure 7 As shown, the self-closing flotation machine 2 includes an air flotation tube 20, an opening and closing valve 21 and a spring 22. The air flotation tube 20 is arranged in the fixing hole 19 on the filter box 1, the air intake pipe assembly 6 is connected with the air flotation tube 20, the opening and closing valve 21 slides through the air flotation tube 20, and the spring 22 is connected between the opening and closing valve 21 and the air flotation tube 20. When the opening and closing valve 21 is inside the hydraulic oil, the opening and closing valve 21 rises due to the buoyancy and makes the air flotation tube 20 connected front to back. When the opening and closing valve 21 is above the liquid surface of the hydraulic oil, the opening and closing valve 21 is no longer affected by the buoyancy, the air flotation tube 20 is disconnected front to back, and the internal gas no longer circulates.

[0064] In order to allow external gas to flow into the hydraulic oil and make the gas adhere to impurities for easy removal, an array of flotation holes 31 are provided on the flotation tube 20 .

[0065] In order to enable the opening and closing valve 21 to rise and fall according to the liquid level, the opening and closing valve 21 includes a perforated sealing plate 23, a lifting rod 24 and a hydraulic float 25. The lifting rod 24 slides up and down in the side wall of the air flotation tube 20. The hydraulic float 25 is arranged at the upper end of the lifting rod 24, and the perforated sealing plate 23 is arranged at the lower end of the lifting rod 24. The buoyancy of the hydraulic float 25 sinking into the hydraulic oil can overcome the resistance of the spring 22, so that the perforated sealing plate 23 moves upward.

[0066] A fixing platform 28 is provided on the air flotation tube 20 , a second sealing plate 27 with holes is provided below the fixing platform 28 , and a lifting groove 29 is provided on the side wall of the second sealing plate 27 with holes.

[0067] The lifting rod 24 is penetrated in the fixed platform 28 , and the perforated sealing plate 1 23 fits the perforated sealing plate 27 and slides up and down in the lifting groove 29 .

[0068] In order to control the connection and disconnection of the air flotation tube 20 front and back by the lifting and lowering of the opening and closing valve 21, a vent hole 26 is provided on the perforated sealing plate 1 23, and a vent hole 2 30 is provided on the perforated sealing plate 27. The positions of the vent hole 1 26 and the vent hole 2 30 are adapted. When the opening and closing valve 21 rises, the vent hole 1 26 and the vent hole 2 30 overlap each other, and the air flotation tube 20 is connected front and back. When the opening and closing valve 21 descends, the vent hole 1 26 and the vent hole 2 30 are completely staggered, and the air flotation tube 20 is disconnected front and back.

[0069] When the flotation tube 20 is disconnected at the front and rear ends, the flotation holes 31 no longer blow air upward, and the gas will not directly act on the centrifugal scraper 3, thereby preventing the impurities above from being blown off.

[0070] In this embodiment, when the liquid level of the hydraulic oil exceeds the hydraulic float 25, the hydraulic float 25 is subjected to an upward buoyancy, and the hydraulic float 25 overcomes the resistance of the spring 22 and moves upward, and drives the perforated sealing plate 23 to move upward through the lifting rod 24.

[0071] When the perforated sealing plate 23 moves upward, the vent hole 26 and the vent hole 2 30 completely overlap, so that the flotation tube 20 is connected front to back, and the external air can pass through the perforated sealing plate 23 and the perforated sealing plate 23 to reach the flotation hole 31, and blow out the gas from the flotation hole 31 to achieve the effect of flotation removal of impurities.

[0072] When the liquid level of the pressurized oil is lower than the hydraulic float 25, the hydraulic float 25 is no longer subjected to the upward buoyancy, and the spring 22 pulls the hydraulic float 25 downward, and drives the perforated sealing plate 1 23 downward through the lifting rod 24, so that the vent hole 1 26 and the vent hole 2 30 are completely offset, the air floatation tube 20 is disconnected front and back, and the air floatation hole 31 no longer sprays gas, so that the air floatation tube 20 above the liquid surface is closed to prevent the blown gas from acting on the centrifugal scraper 3, causing the scraped impurities to fall into the hydraulic oil again.

[0073] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0074] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

[0075] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A wind power hydraulic oil filter device, characterized in that: It comprises a filter box (1), the top of which is rotatably provided with a centrifugal scraper (3), the filter box (1) is provided with an array of distributed self-closing air flotation machines (2), the bottom of the filter box (1) is provided with an ultrafiltration membrane group (4), the ultrafiltration membrane group (4) is connected to a pressure pump (5), and the end of the self-closing air flotation machine (2) is connected to an air intake pipe assembly (6); Each of the self-closing air flotation machines (2) comprises an air flotation tube (20), an opening and closing valve (21) and a spring (22); the air flotation tube (20) is arranged on the filter box (1); the air inlet pipe assembly (6) is in communication with the air flotation tube (20) so as to allow gas to be introduced into the air flotation tube (20); the opening and closing valve (21) is slidably inserted into the air flotation tube (20); and the spring (22) is connected between the opening and closing valve (21) and the air flotation tube (20); A variable-diameter arc plate (9) is fixed to the side wall of the filter box (1), the variable-diameter arc plate (9) being adapted to the radius of the centrifugal scraper (3) so as to intercept impurities, and a separation groove (10) is arranged in an array at the root of the variable-diameter arc plate (9); The centrifugal scraper (3) is composed of a plurality of sets of plates arranged at intervals, and the self-closing air flotation machine (2) is arranged between the gaps between the plates; The air flotation tube (20) is provided with an array of air flotation holes (31); The on-off valve (21) comprises a sealing plate with a hole (23), a lifting rod (24) and a hydraulic float (25), wherein the lifting rod (24) slides up and down in the side wall of the air float tube (20), the hydraulic float (25) is arranged at the upper end of the lifting rod (24), and the sealing plate with a hole (23) is arranged at the lower end of the lifting rod (24); A fixing platform (28) is provided on the air flotation tube (20), a second sealing plate with holes (27) is provided below the fixing platform (28), and a lifting groove (29) is provided on the side wall of the second sealing plate with holes (27); The lifting rod (24) is inserted through the fixed platform (28), and the first sealing plate with holes (23) fits the second sealing plate with holes (27) and slides up and down in the lifting groove (29); The first perforated sealing plate (23) is provided with a first vent hole (26), and the second perforated sealing plate (27) is provided with a second vent hole (30), and the positions of the first vent hole (26) and the second vent hole (30) are adapted to each other; The opening and closing valve (21) on the self-closing air flotation machine (2) can be opened and closed adaptively according to the height of the hydraulic oil. When the hydraulic float (25) exceeds the liquid surface, the self-closing air flotation machine (2) is closed. When the hydraulic float (25) is below the liquid surface, the self-closing air flotation machine (2) is opened, thereby preventing the gas from directly acting on the centrifugal scraper (3) and causing impurities on the centrifugal scraper (3) to be blown off. The centrifugal scraper (3) can scrape off the scum in the filter box (1) when rotating. Under the action of centrifugal force, the scum is thrown away in a direction away from the rotating shaft of the centrifugal scraper (3) and is intercepted by the variable diameter arc plate (9), so that the impurities fall off from the separation tank (10).

2. The wind power hydraulic oil filter device according to claim 1 is characterized in that: A positioning platform (7) is symmetrically provided at the center of the upper wall of the filter box (1), a positioning hole (8) is provided at the center of the positioning platform (7), and both ends of the centrifugal scraper (3) are hinged in the positioning hole (8).

3. The wind power hydraulic oil filter device according to claim 2 is characterized in that: A coarse filter (11) is provided at the middle upper portion of the filter box (1), a fine filter (12) is provided at the middle portion of the filter box (1), an inclined plate (13) is provided at the middle lower portion of the filter box (1), a leakage hole (15) is provided at the lower end of the inclined plate (13), a lower bracket (14) is provided at the bottom of the filter box (1), and the ultrafiltration membrane group (4) is arranged on the lower bracket (14).

4. The wind power hydraulic oil filter device according to claim 3 is characterized in that: The bottom side wall of the filter box (1) is provided with a drainage hole (16), the top side wall of the filter box (1) is provided with a fixing hole (19) in an array, the self-closing air flotation machine (2) is arranged in the fixing hole (19), and the middle part of the side wall of the filter box (1) is provided with a connecting hole 1 (17) and a connecting hole 2 (18), the connecting hole 1 (17) is arranged above the inclined plate (13), and the connecting hole 2 (18) is arranged below the inclined plate (13), and the connecting hole 1 (17) and the connecting hole 2 (18) are connected via a pressure pump (5).

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