A hydraulic oil filter element, a hydraulic oil tank and its application in an aircraft hydraulic system

Abstract

The present invention belongs to the technical field of oil filter elements, specifically a hydraulic oil filter element, a hydraulic oil tank and an application in an aircraft hydraulic system, comprising a metal filter, the outer surface of the metal filter is provided with filter paper, one side of the metal filter is provided with an end ring, and the other side of the end ring is provided with a mounting ring: a rotating shaft is rotatably connected to the axis of the metal filter, a plurality of arc-shaped blades are evenly provided on the outer surface of the rotating shaft, a plurality of rotating scrapers are evenly provided on the circumferential side surface of the rotating shaft, a movable groove is opened on the other side of the rotating scraper, a counterweight plate is sealingly and slidably connected to the inside of the movable groove, a plurality of drainage holes are evenly provided inside the counterweight plate, a one-way drainage valve is provided inside the drainage hole, and a plurality of liquid inlet holes are evenly provided on both side walls of the rotating scraper; the hydraulic oil filter element and the hydraulic oil tank are simple to operate, stable and efficient, effectively ensure the safe and continuous operation of the hydraulic system, and improve the cleanliness and unblocking properties of the hydraulic oil.

Description

Technical Field

[0001] The invention belongs to the technical field of oil filter elements, in particular to a hydraulic oil filter element, a hydraulic oil tank and applications in an aircraft hydraulic system. Background Art

[0002] Aircraft hydraulic oil circuit filter elements, also known as hydraulic oil filter elements, are mainly used to filter impurities and pollutants in the aircraft hydraulic system to ensure the purity of the hydraulic oil and prevent the system from being damaged. It can filter out metal particles and contaminants in the fluid medium, effectively control the contamination degree of the working medium, and protect the normal operation of mechanical equipment. The aircraft hydraulic oil tank is mainly used to store the hydraulic oil required to ensure the operation of the hydraulic system, and is an important part of the hydraulic system.

[0003] Chinese invention patent CN112746994B discloses a liquid return box, which relates to the field of oil return filtration technology, including at least one filter element arranged in a cylindrical shape, a box body, a plurality of liquid inlet pipes and a liquid return pipe, the filter element is evenly provided with a filter layer along the cylinder body, the filter element is provided with a liquid inlet side along the outer cylinder wall, the filter element is provided with axially distributed oil outlet holes along the axis, the filter layer is arranged to enclose the oil outlet holes, the oil outlet holes form a liquid outlet at the end of the filter element, and the filter element is internally arranged in the box body; the aircraft oil circuit filter element has low filtration efficiency and poor dredging effect.

[0004] Chinese invention patent CN117287447A relates to the technical field of hydraulic system filtration, specifically a hydraulic oil filter element, including a filter cartridge, an upper cover, a magnetic rod, a collection box, a collection assembly, a drive assembly and an electrical assembly. A magnetic rod is coaxially mounted below the upper cover, and a collection box that cooperates with the magnetic rod is fixedly mounted on the bottom wall of the upper cover. The hydraulic oil filter element is difficult to operate and has low operating accuracy.

[0005] When the filter holes and filter paper inside the metal filter have been filtering inside the oil storage chamber for a long time, a large amount of impurities are easily attached to the filter holes and the outer surface of the filter paper. If they cannot be cleaned quickly and efficiently, the discharge efficiency of the hydraulic oil will be directly affected.

[0006] And as the height of the hydraulic oil in the oil storage chamber decreases, the oil absorption efficiency of the hydraulic oil in the oil storage chamber decreases, thereby affecting the working stability of the hydraulic system.

[0007] When the filter holes or filter paper are completely blocked, part of the hydraulic oil enters the mounting ring along the bypass valve for oil absorption. The metal filter and filter paper need to be replaced manually, which reduces the efficiency of the metal filter and filter paper, increases the difficulty of operation, and affects the working efficiency of the hydraulic system. Summary of the invention

[0008] In view of the above problems, the present invention provides a hydraulic oil filter element, a hydraulic oil tank and applications in an aircraft hydraulic system.

[0009] To achieve the above object, the present invention provides the following technical solution: a hydraulic oil filter element, comprising a metal filter screen, a filter paper is provided on the outer surface of the metal filter screen, an end ring is provided on one side of the metal filter screen, and a mounting ring is provided on the other side of the end ring:

[0010] The axis of the metal filter is rotatably connected with a rotating shaft, the outer surface of the rotating shaft is evenly provided with a plurality of arc-shaped blades, the peripheral side of the rotating shaft is evenly provided with a plurality of rotating scrapers, the other side of the rotating scraper is provided with a movable groove, the inside of the movable groove is sealingly and slidably connected with a counterweight plate, the inside of the counterweight plate is evenly provided with a plurality of drainage holes, the inside of the drainage hole is provided with a one-way drainage valve, the two side walls of the rotating scraper are evenly provided with a plurality of liquid inlet holes, the inside of the liquid inlet hole is provided with a one-way liquid inlet valve, and one end of each of the plurality of drainage holes is connected with an elastic tube;

[0011] A side flow hole is arranged inside the mounting ring, and a bypass valve is arranged inside the side flow hole.

[0012] When the hydraulic oil inside the metal filter is sucked, the rotating shaft rotates and drives the rotating scraper to rotate, thereby realizing the scraping and cleaning process of the inner wall of the metal filter. At the same time, the hydraulic oil inside the metal filter can be circulated and discharged to improve the clearing effect; when the hydraulic oil content decreases, the hydraulic oil circulation volume is adjusted accordingly to ensure the stable discharge of the hydraulic oil; and when the filter holes or filter paper are blocked, the bypass valve is opened, the rotating shaft speed is increased to the maximum value, and the elastic tube scrapes and clears the filter holes and filter paper.

[0013] Preferably, a plurality of filter holes are evenly arranged inside the metal filter, a tail cover is provided on the side of the metal filter away from the end ring, the tail cover matches the end ring, a through hole is provided at the axis of the end ring, the mounting ring matches the through hole, the two side walls of the filter paper are respectively fixedly connected to the end ring and the tail cover, the filter paper has elasticity and filtering properties, and the filter holes match the filter paper.

[0014] Preferably, a connecting pipe is connected to the side of the mounting ring away from the end ring, a solenoid valve is arranged inside the connecting pipe, a threaded mounting pipe is arranged at the other end of the connecting pipe, a plurality of driving components are evenly arranged between the end ring and the mounting ring, the driving component comprises a driving motor, a side wall of the driving motor is fixedly connected to the side of the mounting ring away from the end ring, an output end of the driving motor passes through the mounting ring and is provided with a transmission tooth, a tooth groove is provided on the side of the end ring close to the mounting ring, the transmission tooth and the tooth groove are meshed with each other for transmission, and a plurality of screws are evenly arranged between the mounting ring, the connecting pipe and the threaded mounting pipe

[0015] Preferably, the outer surface of the rotating shaft is rotatably connected to a bearing seat, and a plurality of fixing rods are evenly arranged on the outer surface of the bearing seat, and the other end of the fixing rod is fixedly connected to the inner wall of the end ring, and the arc blade is located inside the mounting ring, and the arc blade is an inclined arc structure, and the discharge direction of the bypass valve is from the outside to the inside of the mounting ring, and the output end of the bypass valve matches the plurality of arc blades.

[0016] Preferably, a plurality of first connecting rods are evenly provided on the outer surface of the rotating shaft, and the other end of the first connecting rod is fixedly connected to the side wall of the rotating scraper. A central shaft is rotatably connected at the axis of the tail cover, and a plurality of second connecting rods are evenly provided on the outer surface of the central shaft, and the other end of the second connecting rod is fixedly connected to the side wall of the rotating scraper.

[0017] Preferably, the multiple rotating scrapers are mutually away from one end and match the inner wall of the metal filter, the end of the movable groove is provided with a sealing cover, one end of the sealing cover is evenly provided with a plurality of connecting springs, the other end of the connecting spring is fixedly connected to the side wall of the counterweight plate, the inside of the sealing cover is evenly provided with a plurality of docking holes, and the docking holes are sealingly and slidably connected to the outer surface of the elastic tube.

[0018] Preferably, the elastic tube is hollow and elastic, the elastic tube matches the filter hole and the filter paper, the discharge direction of the one-way liquid discharge valve is from the inside of the movable groove to the inside of the elastic tube, the inlet direction of the one-way liquid inlet valve is from the inside of the metal filter to the inside of the movable groove, and the multiple liquid inlet holes are all located at the inner wall end of the movable groove.

[0019] A hydraulic oil tank, which uses a hydraulic oil filter as described above to filter the hydraulic oil, comprises a shell, an oil storage chamber is opened inside the shell, an oil pump is arranged on the top of the shell, an oil suction pipe is arranged on the bottom output end of the oil pump, the other end of the oil suction pipe passes through the shell and is threadedly fixedly connected with a threaded mounting pipe, the output end of the oil pump is connected to a radiator through an oil guide pipe, the output end of the radiator is connected to a supercharger through an oil guide pipe, the output end of the supercharger is connected to multiple oil outlet pipes, and multiple oil return pipes are evenly connected at the bottom of one side of the shell.

[0020] Preferably, hydraulic oil is provided inside the oil storage chamber, an oil filling pipe is connected to one side of the top of the shell, an air filter is provided at the top center of the shell, a liquid level observer is provided on one side of the shell, a plurality of anti-overflow pipes are evenly connected to the upper part of the interior of the shell, a plurality of hooks are evenly provided on the outer surface of the shell, a plurality of inspection ports are evenly opened on the outer surface of the shell, and an inspection cover is provided outside the inspection port.

[0021] The application of a hydraulic oil tank in an aircraft hydraulic system comprises the following steps:

[0022] S1, the oil pump is started and applies suction force to the oil suction pipe, and the hydraulic oil in the oil storage chamber enters the metal filter along the filter paper and filter holes to absorb the oil;

[0023] S2, the hydraulic oil exerts a force on the arc-shaped blades and drives the rotating shaft to rotate, the rotating shaft drives multiple rotating scrapers to rotate, and at the same time, the rotating scrapers rotate through the counterweight plate to drive multiple elastic tubes to rotate and scrape the inner wall of the metal filter;

[0024] S3, when the hydraulic oil content in the oil storage chamber decreases, the force exerted by the hydraulic oil on the arc-shaped blade decreases, the rotation speed of the rotating shaft decreases, and when the rotating scraper is located vertically downward, the sum of the gravity and centrifugal force on the counterweight plate decreases, the downward movement of the counterweight plate along the movable groove decreases, and the content of the hydraulic oil in the metal filter entering the movable groove along the one-way inlet valve inside the liquid inlet hole decreases. Afterwards, when the rotating scraper is vertically upward, the hydraulic oil in the movable groove is discharged to the oil storage chamber along the one-way drain valve inside the drain hole, and the content decreases;

[0025] S4. When the filter hole or filter paper is blocked, the bypass valve opens, and the hydraulic oil in the oil storage chamber enters the inside of the mounting ring along the bypass valve inside the side flow hole. The force exerted by the hydraulic oil on the arc-shaped blade increases, the rotation speed of the rotating shaft increases, the rotation speed of the rotating scraper increases, the centrifugal force on the counterweight plate is greater than the gravity, and the counterweight plate moves along the movable groove toward the outside to the maximum distance. The counterweight plate drives multiple elastic tubes to move outward and scrape and clean the filter hole and filter paper.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention sets the metal filter and the shell and other components to cooperate with each other. The hydraulic oil filter element and the hydraulic oil tank are easy to operate, stable and efficient, effectively ensuring the safe and continuous operation of the hydraulic system and improving the cleanliness and dredging properties of the hydraulic oil.

[0028] 2. The present invention cooperates with other components such as a metal filter and a rotating scraper, so that the hydraulic oil circuit filter element and the hydraulic oil tank can effectively scrape and clean the inner wall of the metal filter during the oil suction process, and realize the circulation of the hydraulic oil, thereby improving the cleanliness and unblocking properties of the metal filter.

[0029] 3. The present invention sets up the mutual cooperation of the oil storage chamber and the counterweight plate and other components. When the hydraulic oil content inside the oil storage chamber in the hydraulic oil circuit filter and the hydraulic oil tank decreases, the return amount of the hydraulic oil can be adjusted accordingly, thereby ensuring that the hydraulic oil can continuously and stably carry out the oil absorption process.

[0030] 4. The present invention sets a bypass valve, an elastic tube and other components to cooperate with each other. After the bypass valve in the hydraulic oil filter element and the hydraulic oil tank is opened, the rotation speed of the rotating shaft is further increased, and then the counterweight plate drives multiple elastic tubes to scrape and clean the filter holes and filter paper, thereby improving the dredging and clearing properties of the filter holes and filter paper, avoiding the filter holes and filter paper from being blocked due to long-term use and affecting the hydraulic oil circulation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional structural schematic diagram of the hydraulic oil circuit filter element of the present invention;

[0032] Figure 2 It is a three-dimensional structural schematic diagram of the hydraulic oil circuit filter element of the present invention from another perspective;

[0033] Figure 3 It is a schematic diagram of the internal three-dimensional structure of the hydraulic oil filter element of the present invention from the front view;

[0034] Figure 4 for Figure 3 Middle A is an enlarged schematic diagram;

[0035] Figure 5 for Figure 3 The enlarged schematic diagram of point B in the middle;

[0036] Figure 6 It is a schematic diagram of the internal three-dimensional structure of the hydraulic oil filter element of the present invention from the front view;

[0037] Figure 7 It is a schematic diagram of the exploded three-dimensional structure of the hydraulic oil filter element of the present invention;

[0038] Figure 8 It is a schematic diagram of the exploded three-dimensional structure of the rotating scraper in the hydraulic oil filter element of the present invention;

[0039] Fig. 9 It is a three-dimensional structural schematic diagram of the oil tank of the present invention;

[0040] Fig.10 It is a schematic diagram of the internal three-dimensional structure of the oil tank of the present invention from the front view.

[0041] In the figure: 1, metal filter; 2, filter hole; 3, filter paper; 4, tail cover; 5, end ring; 6, mounting ring; 7, connecting pipe; 8, threaded mounting pipe; 9, driving assembly; 901, driving motor; 902, transmission gear; 903, tooth groove; 10, screw; 11, fixing rod; 12, bearing seat; 13, rotating shaft; 14, arc blade; 15, first connecting rod; 16, central axis; 17, second connecting rod; 18, rotating scraper; 19, movable groove; 20, counterweight plate; 21, connecting spring; 22, elastic tube; 2 3. Drain hole; 24. One-way drain valve; 25. Inlet hole; 26. One-way inlet valve; 27. Docking hole; 28. Side flow hole; 29. ​​Bypass valve; 30. Solenoid valve; 31. Sealing cover; 32. Shell; 33. Oil storage chamber; 34. Oil filling pipe; 35. Air filter; 36. Oil pump; 37. Oil suction pipe; 38. Oil guide pipe; 39. Radiator; 40. Supercharger; 41. Oil outlet pipe; 42. Oil return pipe; 43. Liquid level observer; 44. Overflow prevention pipe; 45. Hook; 46. Inspection port; 47. Inspection cover. DETAILED DESCRIPTION

[0042] 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.

[0043] like Figure 1-10As shown, a hydraulic oil circuit filter element comprises a metal filter screen 1, a plurality of filter holes 2 are evenly arranged inside the metal filter screen 1, the metal filter screen 1 mainly plays a supporting role, and at the same time, the hydraulic oil is roughly filtered by means of the filter holes 2, the outer surface of the metal filter screen 1 is provided with a filter paper 3, the filter paper 3 is mostly made of special fiber material, which performs fine filtering on the hydraulic oil, thereby ensuring the cleanliness of the hydraulic oil, an end ring 5 is provided on one side of the metal filter screen 1, a mounting ring 6 is provided on the other side of the end ring 5, a plurality of drive components 9 are evenly arranged between the end ring 5 and the mounting ring 6, the drive component 9 comprises a plurality of drive motors 901, the side wall of the drive motor 901 is fixedly connected to the side of the mounting ring 6 away from the end ring 5, and the drive motor 90 The output end of 1 passes through the mounting ring 6 and is provided with a transmission tooth 902, then the driving motor 901 is started and drives the transmission tooth 902 to rotate, and a tooth groove 903 is opened on the side of the end ring 5 close to the mounting ring 6, and the transmission tooth 902 and the tooth groove 903 are meshed with each other for transmission, and the transmission tooth 902 rotates and meshes with the tooth groove 903 and drives the end ring 5 to rotate, and the end ring 5 drives the metal filter 1, the filter paper 3 and the tail cover 4 on the other side to rotate, so as to further improve the uniformity of the hydraulic oil absorption, and at the same time, the end ring 5 and the mounting ring 6 are rotatably connected through the sealing bearing, so on the basis of ensuring that the end ring 5 can rotate, the hydraulic oil inside the oil storage cavity 33 will not enter between the end ring 5 and the mounting ring 6 to affect the rotation of the end ring 5.

[0044] A tail cover 4 is provided on the side of the metal filter 1 away from the end ring 5. The tail cover 4 matches the end ring 5. The tail cover 4 and the end ring 5 have the same size, but the tail cover 4 is in a sealed state, so that the hydraulic oil can only enter the metal filter 1 from the filter paper 3 and the filter hole 2 for discharge. A through hole is provided at the axis of the end ring 5, and the mounting ring 6 matches the through hole. The filtered hydraulic oil enters the mounting ring 6 along the through hole at the center of the end ring 5 for circulation. The two side walls of the filter paper 3 are fixedly connected to the end ring 5 and the tail cover 4 respectively. The filter paper 3 has elasticity and filtering properties. The filter hole 2 matches the filter paper 3. The end ring 5 and the tail cover 4 cooperate to fix the filter paper 3. At the same time, the elastic vibration of the filter paper 3 can also improve the clearing effect.

[0045] A connecting pipe 7 is connected to the side of the mounting ring 6 away from the end ring 5. A solenoid valve 30 is provided inside the connecting pipe 7. When the solenoid valve 30 is opened, the mounting ring 6 is connected to the connecting pipe 7. A threaded mounting pipe 8 is provided at the other end of the connecting pipe 7. The threaded mounting pipe 8 mainly plays a threaded connection role. Multiple screws 10 are evenly arranged between the mounting ring 6, the connecting pipe 7 and the threaded mounting pipe 8. The screws 10 are used to further improve the splicing stability of the mounting ring 6, the connecting pipe 7 and the threaded mounting pipe 8.

[0046] A rotating shaft 13 is rotatably connected to the axis of the metal filter 1, and a plurality of arc-shaped blades 14 are evenly arranged on the outer surface of the rotating shaft 13. The arc-shaped blades 14 are inclined arc-shaped structures. The arc-shaped blades 14 are located inside the mounting ring 6. Therefore, the hydraulic oil entering the mounting ring 6 along the end ring 5 will continuously exert force on the arc-shaped blades 14, thereby causing the plurality of arc-shaped blades 14 to drive the rotating shaft 13 to rotate, thereby improving the efficiency of clearing the filter holes 2 and the filter paper 3 and extracting liquid.

[0047] The outer surface of the rotating shaft 13 is rotatably connected to a bearing seat 12. The setting of the bearing seat 12 improves the rotation stability of the rotating shaft 13. A plurality of fixing rods 11 are evenly arranged on the outer surface of the bearing seat 12. The other end of the fixing rod 11 is fixedly connected to the inner wall of the end ring 5. The fixing rod 11 installs and fixes the position of the bearing seat 12. Therefore, the positions of the bearing seat 12 and the rotating shaft 13 are always located at the axis of the end ring 5, and the rotating shaft 13 continuously rotates inside the bearing seat 12 to pump liquid and clear blockages.

[0048] A plurality of rotating scrapers 18 are evenly arranged on the peripheral side surface of the rotating shaft 13. When the rotating shaft 13 rotates, the rotating scraper 18 is synchronously driven to rotate. A plurality of first connecting rods 15 are evenly arranged on the outer surface of the rotating shaft 13 located inside the metal filter 1. The other end of the first connecting rod 15 is fixedly connected to the side wall of the rotating scraper 18, that is, when the rotating shaft 13 rotates, the rotating scraper 18 at the corresponding position is driven to rotate by the plurality of first connecting rods 15. A central shaft 16 is rotatably connected to the axis of the tail cover 4. A plurality of second connecting rods 17 are evenly arranged on the outer surface of the central shaft 16. The other end of the second connecting rod 17 is fixedly connected to the side wall of the rotating scraper 18. The setting of the second connecting rod 17 ensures the stability and safety of the rotation of the rotating scraper 18.

[0049] A plurality of rotating scrapers 18 are mutually away from one end and match the inner wall of the metal filter 1. The rotating scraper 18 rotates to scrape and clean the inner wall of the metal filter 1, effectively improving the passability of the hydraulic oil. A movable groove 19 is opened on the other side of the rotating scraper 18. A sealing cover 31 is provided at the end of the movable groove 19. Therefore, the movable groove 19 is a sealed space. The internal sealing sliding connection of the movable groove 19 is connected with a counterweight plate 20. When the counterweight plate 20 moves inside the movable groove 19, the hydraulic oil content inside the movable groove 19 changes accordingly.

[0050] A plurality of drainage holes 23 are evenly arranged inside the counterweight plate 20, and the hydraulic oil inside the movable groove 19 can be discharged along the drainage holes 23, wherein the hydraulic oil is mainly located at the bottom of the movable groove 19, that is, there is no hydraulic oil between the counterweight plate 20 and the sealing cover 31, and one end of the plurality of drainage holes 23 is connected to an elastic tube 22, the elastic tube 22 is hollow and elastic, and the elastic tube 22 matches the filter hole 2 and the filter paper 3, so that the hydraulic oil can be discharged from the elastic tube 22, and the elastic tube 22 is driven to move in cooperation with the counterweight plate 20, thereby further improving the scraping and cleaning effect of the filter hole 2 and the filter paper 3.

[0051] A one-way drain valve 24 is provided inside the drain hole 23, and the drain direction of the one-way drain valve 24 is from the inside of the movable groove 19 to the inside of the elastic tube 22. When the counterweight plate 20 moves away from the sealing cover 31 end, the counterweight plate 20 squeezes the hydraulic oil inside the movable groove 19, and the hydraulic oil enters the elastic tube 22 along the one-way drain valve 24 inside the drain hole 23 for circulation. A plurality of liquid inlet holes 25 are evenly provided on both side walls of the rotating scraper 18, and a one-way liquid inlet valve 26 is provided inside the liquid inlet hole 25. The liquid inlet direction of the one-way liquid inlet valve 26 is from the inside of the metal filter 1 to the inside of the movable groove 19. The plurality of liquid inlet holes 25 are all located at the inner wall end of the movable groove 19. When the counterweight plate 20 moves toward the end close to the sealing cover 31, the space between the counterweight plate 20 and the inner wall of the movable groove 19 increases and the pressure decreases. Then, under the action of negative pressure, the hydraulic oil inside the metal filter 1 is extracted and enters the inside of the movable groove 19 along the one-way liquid inlet valve 26 inside the liquid inlet hole 25.

[0052] One end of the sealing cover 31 is evenly provided with a plurality of connecting springs 21, and the other end of the connecting spring 21 is fixedly connected to the side wall of the counterweight plate 20. The setting of the connecting spring 21 further improves the elastic reset performance of the counterweight plate 20. The interior of the sealing cover 31 is evenly provided with a plurality of docking holes 27, and the docking holes 27 are sealingly and slidably connected to the outer surface of the elastic tube 22. The docking holes 27 limit the sliding of the elastic tube 22 and scrape it to ensure the cleanliness and elastic deformation of the outer surface of the elastic tube 22, thereby improving the scraping and cleaning effect of the elastic tube 22 on the filter hole 2 and the filter paper 3.

[0053] A side flow hole 28 is provided inside the mounting ring 6, and a bypass valve 29 is provided inside the side flow hole 28. When the filter hole 2 and the filter paper 3 are blocked too seriously but the pressure of the hydraulic oil circulating inside the metal filter 1 does not meet the requirements, the pressure value exerted by the hydraulic oil on the bypass valve 29 inside the side flow hole 28 increases, and the bypass valve 29 opens. The hydraulic oil can directly enter the inside of the mounting ring 6 along the bypass valve 29 for circulation, ensuring the stability of the hydraulic system. The discharge direction of the bypass valve 29 is from the outside to the inside of the mounting ring 6. The output end of the bypass valve 29 matches the multiple arc-shaped blades 14. When the bypass valve 29 is opened, the hydraulic oil directly acts on the outer surface of the arc-shaped blade 14, thereby causing the arc-shaped blade 14 to drive the rotation speed of the rotating shaft 13 to increase.

[0054] A hydraulic oil tank, which uses the above-mentioned hydraulic oil filter element to filter the hydraulic oil, includes a shell 32, an oil storage chamber 33 is opened inside the shell 32, and hydraulic oil is arranged inside the oil storage chamber 33. A pump 36 is arranged on the top of the shell 32, and an oil suction pipe 37 is arranged at the bottom output end of the pump 36. The other end of the oil suction pipe 37 passes through the shell 32 and is threadedly fixedly connected to the threaded mounting pipe 8. When the pump 36 is started and applies suction force to the oil suction pipe 37, the suction force acts on the inside of the metal filter 1 and applies suction force to the hydraulic oil in the oil storage chamber 33, so as to realize the normal discharge of the hydraulic oil. The output end of the pump 36 is connected to a radiator 39 through an oil guide pipe 38, and the radiator 39 is connected to the oil after discharge. The temperature of the hydraulic oil is adjusted to ensure the stability and constant temperature of the hydraulic oil. The output end of the radiator 39 is connected to the supercharger 40 through the oil guide pipe 38. The output end of the supercharger 40 is connected to multiple oil outlet pipes 41. The hydraulic oil after being pressurized is discharged into the hydraulic system along the oil outlet pipe 41, thereby improving the working efficiency and working stability of the hydraulic oil. Multiple return oil pipes 42 are evenly connected at the lower side of the housing 32. After the hydraulic system works, the hydraulic oil enters the oil storage chamber 33 along the return oil pipe 42 for temporary storage, thereby realizing the circulation of the hydraulic oil. At the same time, there is generally a filter component at the output end of the return oil pipe 42, but since this process is oil return, only simple filtering is required.

[0055] An oil filling pipe 34 is connected to one side of the top of the shell 32, and hydraulic oil is added to the oil storage chamber 33 along the oil filling pipe 34. An air filter 35 is provided at the center of the top of the shell 32, and the air filter 35 filters the air inside the oil storage chamber 33. A liquid level observer 43 is provided on one side of the shell 32, and the liquid level observer 43 observes the oil level inside the oil storage chamber 33. A plurality of overflow prevention pipes 44 are evenly connected to the upper part of the interior of the shell 32. If the hydraulic oil content in the oil storage chamber 33 is too much, it can be discharged along the overflow prevention pipe 44. The setting of the overflow prevention pipe 44 effectively avoids affecting the normal operation of the hydraulic oil when the hydraulic oil content in the oil storage chamber 33 is too much. A plurality of hooks 45 are evenly provided on the outer surface of the shell 32, and the hooks 45 are convenient for fixing the shell 32. A plurality of inspection ports 46 are evenly opened on the outer surface of the shell 32, and an inspection cover 47 is provided outside the inspection port 46. When it is necessary to inspect the interior of the shell 32, the inspection cover 47 is opened, and the interior of the oil storage chamber 33 is inspected along the inspection port 46.

[0056] When the metal filter 1 and the filter paper 3 are filtered in the oil storage chamber 33 for a long time, a large amount of impurities are easily attached to the filter holes 2 inside the metal filter 1 and the outer surface of the filter paper 3. If they cannot be cleaned quickly and efficiently, the discharge efficiency of the hydraulic oil will be directly affected; and when the hydraulic oil level in the oil storage chamber 33 decreases, the oil absorption efficiency of the hydraulic oil in the oil storage chamber 33 decreases, thereby affecting the working stability of the hydraulic system; and when the metal filter 1 or the filter paper 3 is completely blocked, part of the hydraulic oil enters the mounting ring 6 along the bypass valve 29 for oil absorption, and the metal filter 1 or the filter paper 3 needs to be replaced manually later, thereby reducing the use efficiency of the metal filter 1 or the filter paper 3, and increasing the difficulty of operation, affecting the working efficiency of the hydraulic system.

[0057] In order to solve the above problems, when the hydraulic oil circuit filter element, i.e. the hydraulic oil tank, is actually used, the solenoid valve 30 is opened, the oil pump 36 is started and a suction force is applied to the oil suction pipe 37. Under the action of the suction force, the hydraulic oil inside the oil storage chamber 33 enters the metal filter 1 through the filter paper 3 and the filter hole 2, and reaches the end ring 5 along the metal filter 1. Then, the hydraulic oil enters the oil suction pipe 37 through the mounting ring 6, the connecting pipe 7 and the threaded mounting pipe 8 in turn for discharge. The output end of the oil pump 36 allows the hydraulic oil to enter the radiator 39 along the oil guide pipe 38 for temperature regulation. Then, the hydraulic oil enters the supercharger 40 along the oil guide pipe 38 for supercharging, and then enters the hydraulic system along the oil outlet pipe 41 for work. After the work is completed, the hydraulic oil re-enters the oil storage chamber 33 along the return oil pipe 42, thereby realizing the recycling process of the hydraulic oil, further improving the stability and cleanliness of the hydraulic oil tank, and ensuring the normal use of the hydraulic system.

[0058] At the same time, when the hydraulic oil passes through the end ring 5, the hydraulic oil exerts a force on the multiple arc-shaped blades 14, and the arc-shaped blades 14 drive the rotating shaft 13 to rotate inside the bearing seat 12. The rotating shaft 13 drives the rotating scraper 18 to rotate through the multiple first connecting rods 15 on the outer surface, and the other end of the rotating scraper 18 drives the central axis 16 to rotate through the second connecting rod 17, thereby ensuring the stability and support of the rotating scraper 18. At the same time, the rotating scraper 18 rotates to scrape and clean the inner wall of the metal filter 1, further improving the dredging of the inner wall of the metal filter 1 and ensuring the circulation stability of the hydraulic oil.

[0059] When the rotating scraper 18 rotates, the multiple elastic tubes 22 are synchronously driven to rotate. The elastic tubes 22 clear the filter holes 2 with their own elastic action, further improving the dredging performance of the filter holes 2, and preventing the filter holes 2 from being blocked by impurities inside the hydraulic oil and affecting the fluidity of the hydraulic oil. As the rotating scraper 18 rotates, in the initial situation, when the rotating scraper 18 rotates to the vertical downward direction, since the gravity and centrifugal force on the counterweight plate 20 are both downward, the counterweight plate 20 squeezes the connecting spring 21 and moves along the movable groove 19 to the initial distance close to the sealing cover 31 end, that is, the counterweight plate 20 moves downward to the initial position, and the distance between the counterweight plate 20 and the sealing cover 31 is the smallest. The volume between the end of the counterweight plate 20 away from the sealing cover 31 and the movable groove 19 increases and the pressure decreases. Under the action of negative pressure, the hydraulic oil inside the metal filter 1 is extracted along the one-way liquid inlet valve 26 inside the liquid inlet hole 25 to the inside of the movable groove 19 to wait for subsequent discharge.

[0060] As the rotating scraper 18 rotates upward continuously, the directions of gravity and centrifugal force on the rotating scraper 18 are constantly changing. When the rotating scraper 18 is in the vertical upward direction, the counterweight plate 20 is subjected to the vertical downward gravity, while the centrifugal force on the counterweight plate 20 is upward. Since the gravity of the counterweight plate 20 is greater than the centrifugal force, the counterweight plate 20 moves away from the sealing cover 31 to the initial position under the combined action of gravity and the elastic force of the connecting spring 21. The distance between the counterweight plate 20 and the sealing cover 31 is the largest, and the hydraulic oil in the movable groove 19 is subjected to the counterweight. The extrusion of the plate 20 is discharged along the one-way drain valve 24 inside the multiple drain holes 23, and the hydraulic oil enters the elastic tube 22 and is discharged along the other end of the elastic tube 22, and finally flows back to the oil storage chamber 33 along the filter hole 2 and the filter paper 3, thereby achieving a reflux effect of the hydraulic oil. At the same time, the discharged hydraulic oil flows in the opposite direction to the hydraulic oil in the oil storage chamber 33, effectively improving the reverse clearing effect of the filter hole 2 and the filter paper 3, and also improving the flow effect of the hydraulic oil in the oil storage chamber 33, avoiding the hydraulic oil from being precipitated and reducing fluidity when it is in a static state for a long time.

[0061] At the same time, when the multiple rotating scrapers 18 rotate, the driving motor 901 starts and drives the transmission gear 902 to rotate. The transmission gear 902 and the tooth groove 903 mesh with each other and drive the end ring 5 to rotate. The end ring 5 drives the metal filter 1, filter paper 3 and tail cover 4 at the other end to rotate. The rotation direction of the metal filter 1 and the filter paper 3 is opposite to the rotation direction of the multiple rotating scrapers 18, and the rotation speed of the metal filter 1 and the filter paper 3 is much smaller than the rotation speed of the multiple rotating scrapers 18. Therefore, as the rotating scraper 18 continues to rotate, the hydraulic oil inside the metal filter 1 continues to flow unidirectionally along the liquid inlet hole 25 and the liquid discharge hole 23, and is finally discharged along the end of the elastic tube 22. At the same time, with the continuous rotation of the metal filter 1 and the filter paper 3, the thoroughness and uniformity of the impact cleaning of the filter holes 2 and the filter paper 3 inside the metal filter 1 are further realized, thereby improving the clearing effect.

[0062] As the oil pump 36 continues to pump oil, the hydraulic oil content in the oil storage chamber 33 continues to decrease, and the hydraulic pressure of the hydraulic oil in the oil storage chamber 33 continues to decrease. The hydraulic pressure of the hydraulic oil entering the metal filter 1 along the filter hole 2 and the filter paper 3 decreases, and the force exerted by the hydraulic oil on the arc blade 14 decreases. The arc blade 14 drives the rotation speed of the rotating shaft 13 to decrease, and the rotating shaft 13 drives the rotating scraper 18 to decrease through the multiple first connecting rods 15. The counterweight plate 20 inside the rotating scraper 18 is affected by The centrifugal force is reduced. When the rotating scraper 18 drives the counterweight plate 20 to rotate vertically downward, the gravity on the counterweight plate 20 remains unchanged and the centrifugal force is reduced. The distance that the counterweight plate 20 stretches the connecting spring 21 to move toward the end close to the sealing cover 31 is reduced, that is, the distance that the counterweight plate 20 moves downward along the movable groove 19 is reduced, the volume between the counterweight plate 20 and the movable groove 19 is reduced, and the amount of hydraulic oil inside the metal filter 1 that enters the movable groove 19 along the one-way inlet valve 26 inside the inlet hole 25 is reduced.

[0063] Afterwards, as the rotating scraper 18 continues to rotate, when the rotating scraper 18 rotates to the vertical upward position, since the gravity on the counterweight plate 20 is greater than the centrifugal force, the counterweight plate 20 moves to the maximum distance away from the sealing cover 31 end, that is, the counterweight plate 20 moves downward to the maximum distance along the movable groove 19, and the hydraulic oil inside the movable groove 19 enters the elastic tube 22 along the one-way drain valve 24 inside the drain hole 23, and is discharged to the filter hole 2 and the filter paper 3 along the end of the elastic tube 22, and finally enters the oil storage chamber 33 along the filter paper 3 for reflux. However, since the flow rate of the hydraulic oil inside the movable groove 19 is reduced, the hydraulic oil inside the metal filter 1 refluxes along the filter hole 2 and the filter paper 3 to the oil storage chamber 33, and the content is reduced, thereby ensuring the stable flow of the hydraulic oil inside the metal filter 1, and ensuring that the hydraulic oil content entering the oil suction pipe 37 along the end ring 5, the mounting ring 6, the connecting pipe 7 and the threaded mounting pipe 8 is stable, further improving the efficient and stable operation of the hydraulic system, and improving the safety and sustainability of the hydraulic system.

[0064] When the filter holes 2 and filter paper 3 inside the metal filter 1 are used for a long time to filter the hydraulic oil inside the oil storage chamber 33, the filter holes 2 and filter paper 3 inside the metal filter 1 are prone to clogging, and the amount of hydraulic oil entering the metal filter 1 along the filter holes 2 and filter paper 3 is reduced, the oil pressure inside the oil storage chamber 33 increases and the force exerted on the bypass valve 29 increases, then the bypass valve 29 opens, and the hydraulic oil inside the oil storage chamber 33 flows into the mounting ring 6 along the bypass valve 29 inside the side flow hole 28. In this process, the force exerted by the hydraulic oil on the multiple arc-shaped blades 14 is further increased, and the multiple arc-shaped blades 14 drive the rotating shaft 13 to increase its rotation speed, and the rotating shaft 13 passes through the multiple first connecting holes. The connecting rod 15 drives the rotation speed of multiple rotating scrapers 18 to increase, and the rotating scrapers 18 drive the internal counterweight plate 20 to increase its rotation speed. At this time, the centrifugal force on the counterweight plate 20 is greater than the gravity. The counterweight plate 20 squeezes the connecting spring 21 at any position and drives multiple counterweight plates 20 to move to the maximum distance close to the sealing cover 31 end. The distance between the counterweight plate 20 and the sealing cover 31 is at the minimum value, and then multiple elastic tubes 22 are extended to the maximum distance along the movable groove 19. When the rotating scraper 18 rotates, it drives multiple elastic tubes 22 to rotate and rotate and scrape the filter hole 2 and the filter paper 3, thereby improving the clearing effect of the filter hole 2 and the filter paper 3, and ensuring the filtering effect of the hydraulic oil when the hydraulic system is working.

[0065] As the elastic tube 22 continuously scrapes and cleans the filter holes 2 and the filter paper 3, the filter holes 2 and the filter paper 3 resume filtering and circulating the hydraulic oil. The hydraulic oil inside the oil storage chamber 33 can continue to pass through the filter holes 2 and the filter paper 3 into the metal filter 1 for circulation. The hydraulic pressure on the bypass valve 29 is reduced and gradually closed. The hydraulic oil inside the oil storage chamber 33 cannot enter the mounting ring 6 along the bypass valve 29 inside the side flow hole 28 for circulation, and the hydraulic oil circuit filter element continues to resume normal working state.

[0066] The hydraulic oil circuit filter and hydraulic oil tank are simple to operate, stable and efficient, effectively ensure the safe and continuous operation of the hydraulic system, and improve the cleanliness and unblocking properties of the hydraulic oil; at the same time, during the oil absorption process, the inner wall of the metal filter 1 can be effectively scraped and cleaned, and the circulation of the hydraulic oil can be realized, thereby improving the cleanliness and unblocking properties of the metal filter 1; and when the hydraulic oil content in the oil storage chamber 33 decreases, the reflux amount of the hydraulic oil can be adjusted accordingly, thereby ensuring that the hydraulic oil continues to perform the oil absorption process stably; after the bypass valve 29 is opened, the rotation speed of the rotating shaft 13 is further increased, and then the counterweight plate 20 drives multiple elastic tubes 22 to scrape and clean the filter holes 2 and the filter paper 3, thereby improving the unblocking properties and clearing properties of the filter holes 2 and the filter paper 3, and avoiding the blockage of the filter holes 2 and the filter paper 3 after long-term use and affecting the hydraulic oil circulation efficiency.

[0067] The application of a hydraulic oil tank as described above in an aircraft hydraulic system comprises the following steps:

[0068] S1, the oil pump 36 is started and applies suction force to the oil suction pipe 37, and the hydraulic oil in the oil storage chamber 33 enters the metal filter 1 along the filter paper 3 and the filter hole 2 to absorb the oil.

[0069] S2. The hydraulic oil exerts a force on the arc-shaped blades 14 and drives the rotating shaft 13 to rotate. The rotating shaft 13 drives the multiple rotating scrapers 18 to rotate. At the same time, the rotating scrapers 18 rotate through the counterweight plate 20 to drive the multiple elastic tubes 22 to rotate and scrape the inner wall of the metal filter 1.

[0070] S3. When the hydraulic oil content inside the oil storage chamber 33 decreases, the force exerted by the hydraulic oil on the arc-shaped blades 14 decreases, and the rotation speed of the rotating shaft 13 decreases. When the rotating scraper 18 is located vertically downward, the sum of the gravity and centrifugal force on the counterweight plate 20 decreases, and the downward movement of the counterweight plate 20 along the movable groove 19 decreases. The content of the hydraulic oil inside the metal filter 1 entering the movable groove 19 along the one-way inlet valve 26 inside the inlet hole 25 decreases. Afterwards, when the rotating scraper 18 is vertically upward, the hydraulic oil in the movable groove 19 is discharged to the oil storage chamber 33 along the one-way drain valve 24 inside the drain hole 23, and the content decreases.

[0071] S4. When the filter hole 2 or the filter paper 3 is blocked, the bypass valve 29 opens, and the hydraulic oil in the oil storage chamber 33 enters the inside of the mounting ring 6 along the bypass valve 29 inside the side flow hole 28. The hydraulic oil exerts an increasing force on the arc-shaped blades 14, the rotation speed of the rotating shaft 13 increases, the rotation speed of the rotating scraper 18 increases, and the centrifugal force on the counterweight plate 20 is greater than the gravity. The counterweight plate 20 moves along the movable groove 19 toward the outside to the maximum distance, and the counterweight plate 20 drives multiple elastic tubes 22 to move outward and scrape and clean the filter hole 2 and the filter paper 3.

[0072] By using the hydraulic oil filter element and the hydraulic oil tank in the aircraft hydraulic system, the filtering efficiency is improved and the filtering effect is guaranteed.

[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] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic oil filter element, comprising a metal filter (1), a filter paper (3) being provided on the outer surface of the metal filter (1), an end ring (5) being provided on one side of the metal filter (1), and a mounting ring (6) being provided on the other side of the end ring (5), characterized in that: The metal filter (1) is rotatably connected to a rotating shaft (13) at the axis center, a plurality of arc-shaped blades (14) are evenly arranged on the outer surface of one end of the rotating shaft (13), a plurality of first connecting rods (15) are evenly arranged on the outer surface of the rotating shaft (13), the other end of the first connecting rod (15) is fixedly connected to the side wall of a rotating scraper (18), a movable groove (19) is provided on the side of the rotating scraper (18) away from the rotating shaft (13), a counterweight plate (20) is sealingly and slidably connected inside the movable groove (19), a plurality of drainage holes (23) are evenly arranged inside the counterweight plate (20), a one-way drainage valve (24) is arranged inside the drainage hole (23), a plurality of inlet holes (25) are evenly arranged on both side walls of the rotating scraper (18), a one-way inlet valve (26) is arranged inside the inlet hole (25), and an elastic tube (22) is connected to one end of the plurality of drainage holes (23) away from the rotating shaft (13); A side flow hole (28) is provided inside the mounting ring (6), and a bypass valve (29) is provided inside the side flow hole (28); The metal filter (1) is evenly provided with a plurality of filter holes (2) inside, the metal filter (1) is provided with a tail cover (4) on the side away from the end ring (5), the tail cover (4) matches the end ring (5), a through hole is provided at the axis of the end ring (5), the mounting ring (6) matches the through hole, the two side walls of the filter paper (3) are respectively fixedly connected to the end ring (5) and the tail cover (4), the filter paper (3) has elasticity and filtering properties, and the filter holes (2) match the filter paper (3); The plurality of rotating scrapers (18) are mutually separated at one end and matched with the inner wall of the metal filter (1); the movable groove (19) is provided with a sealing cover (31) at one end separated from the rotating shaft (13); a plurality of connecting springs (21) are evenly arranged at one end of the sealing cover (31); the other end of the connecting spring (21) is fixedly connected to the side wall of the counterweight plate (20); a plurality of docking holes (27) are evenly arranged inside the sealing cover (31); the docking holes (27) are sealingly and slidably connected to the outer surface of the elastic tube (22); The elastic tube (22) is hollow and elastic. The elastic tube (22) matches the filter hole (2) and the filter paper (3). The one-way discharge valve (24) discharges liquid from the inside of the movable groove (19) to the inside of the elastic tube (22). The one-way inlet valve (26) inlets liquid from the inside of the metal filter (1) to the inside of the movable groove (19). When the counterweight plate (20) moves toward the end close to the sealing cover (31), the space between the counterweight plate (20) and the inner wall of the movable groove (19) increases and the pressure decreases. Then, under the action of negative pressure, the hydraulic oil in the metal filter (1) is drawn along the one-way inlet valve (26) inside the inlet hole (25) into the inside of the movable groove (19).

2. A hydraulic oil filter according to claim 1, characterized in that: A connecting pipe (7) is connected to the side of the mounting ring (6) away from the end ring (5), a solenoid valve (30) is provided inside the connecting pipe (7), a threaded mounting pipe (8) is provided at the other end of the connecting pipe (7), a plurality of drive components (9) are evenly arranged between the end ring (5) and the mounting ring (6), the drive components (9) comprising a drive motor (901), a side wall of the drive motor (901) being fixedly connected to the side of the mounting ring (6) away from the end ring (5), an output end of the drive motor (901) passing through the mounting ring (6) and provided with a transmission tooth (902), a tooth groove (903) is provided on the side of the end ring (5) close to the mounting ring (6), the transmission tooth (902) and the tooth groove (903) meshing with each other for transmission, and a plurality of screws (10) are evenly arranged between the mounting ring (6), the connecting pipe (7) and the threaded mounting pipe (8).

3. A hydraulic oil filter according to claim 1, characterized in that: The outer surface of the rotating shaft (13) is rotatably connected to a bearing seat (12), and a plurality of fixing rods (11) are evenly arranged on the outer surface of the bearing seat (12). The other end of the fixing rod (11) is fixedly connected to the inner wall of the end ring (5). The arc-shaped blades (14) are located inside the mounting ring (6). The arc-shaped blades (14) are inclined arc-shaped structures. The drainage direction of the bypass valve (29) is from the outside to the inside of the mounting ring (6). The output end of the bypass valve (29) matches the plurality of arc-shaped blades (14).

4. A hydraulic oil filter according to claim 1, characterized in that: The tail cover (4) is rotatably connected to a central shaft (16) at its axis, and a plurality of second connecting rods (17) are evenly arranged on the outer surface of the central shaft (16). The other ends of the second connecting rods (17) are fixedly connected to the side wall of the rotating scraper (18).

5. A hydraulic oil tank, wherein the hydraulic oil tank uses a hydraulic oil filter element as claimed in claim 1 to filter hydraulic oil, comprising a housing (32), characterized in that: An oil storage chamber (33) is provided inside the shell (32), an oil pump (36) is provided on the top of the shell (32), an oil suction pipe (37) is provided at the bottom output end of the oil pump (36), the other end of the oil suction pipe (37) passes through the shell (32) and is threadedly fixedly connected to the threaded mounting pipe (8), the output end of the oil pump (36) is connected to a radiator (39) through an oil guide pipe (38), the output end of the radiator (39) is connected to a supercharger (40) through an oil guide pipe (38), the output end of the supercharger (40) is connected to a plurality of oil outlet pipes (41), and a plurality of oil return pipes (42) are evenly connected at the bottom of one side of the shell (32).

6. A hydraulic oil tank according to claim 5, characterized in that: Hydraulic oil is provided inside the oil storage chamber (33), one side of the top of the shell (32) is connected to an oil filling pipe (34), an air filter (35) is provided at the center of the top of the shell (32), one side of the shell (32) is provided with a liquid level observer (43), the top of the shell (32) is evenly connected to a plurality of anti-overflow pipes (44), the outer surface of the shell (32) is evenly provided with a plurality of hooks (45), the outer surface of the shell (32) is evenly provided with a plurality of inspection ports (46), and an inspection cover (47) is provided outside the inspection port (46).

7. The use of a hydraulic oil tank as claimed in claim 5 in an aircraft hydraulic system comprises the following steps, characterized in that: S1, the oil pump (36) is started and applies suction force to the oil suction pipe (37), so that the hydraulic oil in the oil storage chamber (33) enters the metal filter (1) along the filter paper (3) and the filter holes (2) to absorb the oil; S2, the hydraulic oil exerts a force on the arc-shaped blade (14) and drives the rotating shaft (13) to rotate, and the rotating shaft (13) drives the plurality of rotating scrapers (18) to rotate, and at the same time, the rotating scrapers (18) rotate through the counterweight plate (20) to drive the plurality of elastic tubes (22) to rotate and scrape the inner wall of the metal filter (1); S3, when the hydraulic oil content in the oil storage chamber (33) decreases, the force exerted by the hydraulic oil on the arc-shaped blade (14) decreases, the rotation speed of the rotating shaft (13) decreases, and when the rotating scraper (18) is located vertically downward, the sum of the gravity and centrifugal force on the counterweight plate (20) decreases, the amount of downward movement of the counterweight plate (20) along the movable groove (19) decreases, and the content of the hydraulic oil in the metal filter (1) entering the movable groove (19) along the one-way inlet valve (26) inside the inlet hole (25) decreases. Afterwards, when the rotating scraper (18) is vertically upward, the hydraulic oil in the movable groove (19) is discharged to the oil storage chamber (33) along the one-way drain valve (24) inside the drain hole (23), and the content of the hydraulic oil decreases; S4. When the filter hole (2) or the filter paper (3) is blocked, the bypass valve (29) is opened, and the hydraulic oil in the oil storage chamber (33) enters the interior of the mounting ring (6) along the bypass valve (29) inside the side flow hole (28). The hydraulic oil exerts an increasing force on the arc-shaped blade (14), the rotation speed of the rotating shaft (13) increases, the rotation speed of the rotating scraper (18) increases, the centrifugal force on the counterweight plate (20) is greater than the gravity, and the counterweight plate (20) moves along the movable groove (19) toward the outside to the maximum distance. The counterweight plate (20) drives the multiple elastic tubes (22) to move outward and scrape and clean the filter hole (2) and the filter paper (3).

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