Dustproof filter device for wind power lubrication pump

Abstract

This invention relates to the field of wind power lubrication equipment technology, specifically a dustproof filtration device for wind power lubrication pumps. The device includes a pump body, filter housing, filter cylinder, pump shaft extension, a purely mechanical differential pressure triggering mechanism, a one-way overrunning clutch, and a cleaning component. The filter housing is a sealed cylindrical cavity with an oil inlet pipe at the left end for connecting to the oil suction line and a flange at the right end for connecting to the pump body's oil suction port. The filter cylinder has an end cap at the end near the oil inlet. The filter cylinder is coaxially fitted inside the filter housing, with the cylinder wall serving as the filter medium. The outer side of the filter cylinder is the pre-filter chamber, and the inner side is the oil guide chamber. Oil flows radially from the outside to the inside through the filter cylinder into the oil guide chamber and then flows through the flange into the pump body's oil suction port. This invention reuses pump shaft power and uses purely mechanical triggering, eliminating the need for additional motors and electrical controls. It combines low-resistance filtration with swirling self-cleaning functions, adapting to the harsh operating conditions of wind power and significantly reducing high-altitude maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of wind power lubrication equipment technology, and in particular to a dust filter device for wind power lubrication pumps. Background Technology

[0002] With the rapid development of my country's new energy industry, the installed capacity of wind power has continued to grow. As the core transmission components of wind turbines, the wind turbine gearbox and main shaft bearings directly determine the service life and power generation efficiency of the entire unit. The lubrication system is the key to ensuring the stable operation of the transmission components. As the power core of the lubrication system, the lubrication pump undertakes the important function of drawing oil from the oil tank and pumping clean lubricating oil to each lubrication point.

[0003] During actual operation, lubricating oil will continuously mix with external sand, metal shavings, seal wear particles and other solid impurities during circulation. If these solid particles directly enter the lubrication pump with the oil, they will cause severe abrasive wear on the gear meshing surface, bearing rolling elements and raceways, distribution plate and other precision moving parts inside the pump, resulting in decreased pump volumetric efficiency, increased noise and aggravated leakage.

[0004] Existing wind turbine lubrication pumps generally use fixed metal braided mesh or sintered filter elements for coarse filtration on the suction side to intercept large-diameter impurities and protect the pump body. However, this solution has certain shortcomings in practical applications: fixed filter elements have no self-cleaning ability. As the operating time increases, sand and dust particles will gradually accumulate on the surface of the filter material, and the filtration resistance will continue to increase. When the resistance exceeds the pump's suction vacuum limit, it is very easy to cause cavitation in the lubrication pump, resulting in vibration, noise, and flow fluctuations. Most existing filter devices with self-cleaning functions require additional configuration of drive motors, hydraulic motors, or backwash pulse air sources. Not only are they complex in structure and bulky, making it difficult to fit into the narrow installation space on the suction side of the lubrication pump, but they also require matching electrical control components and power pipelines. Under the harsh operating conditions of low temperature, strong electromagnetic interference, and high humidity at wind power sites, the failure rate of electrical components is high and the reliability is poor, increasing the system's failure points. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a dust filter device for wind power lubrication pumps, which solves the problems of existing wind power lubrication pump oil suction filters having no self-cleaning ability, being prone to clogging, having high operation and maintenance costs, and having poor electrical drive reliability.

[0006] The technical solution of the present invention is a dustproof filtration device for a wind power lubrication pump, comprising a pump body, a filter shell, a filter cylinder, a pump shaft extension section, a purely mechanical differential pressure triggering mechanism, a one-way overrunning clutch, and a cleaning component. The filter shell is a sealed cylindrical cavity with an oil inlet pipe for connecting to the oil suction pipe at the left end and a flange for connecting to the oil suction port of the pump body at the right end. The filter cylinder has an end cap at one end near the oil inlet. The filter cylinder is coaxially sleeved inside the filter shell, and the cylinder wall is the filter medium. The outer side of the filter cylinder is the pre-filter chamber, and the inner side is the oil guide chamber. The oil flows radially from the outside to the inside through the filter cylinder into the oil guide chamber and then flows into the oil suction port of the pump body through the flange.

[0007] Preferably, the one-way overrunning clutch includes a driving member and a driven member. A connecting rod is fixedly connected to the center of the end cover along the axial direction of the filter cartridge. The driving member is fixed to the end of the pump shaft extension section, and the driven member is fixed to the end of the connecting rod near the driving member.

[0008] Preferably, the purely mechanical differential pressure triggering mechanism includes a piston, guide rods, springs, and retaining rings. The piston is slidably and sealed to the inner wall of the filter housing. There are three guide rods arranged in a circular array. One end of the guide rod is fixed to the filter housing, and the other end is inserted into the piston to restrict the piston's rotation. The spring is sleeved on the outside of the guide rods, and its two ends are respectively set on the piston and the filter housing. Normally, it pushes the piston to the left. The retaining ring is coaxially set on the non-filtration section of the filter cartridge and inserted into the inner side of the piston.

[0009] Preferably, a sealing ring is fitted between the piston and the filter cartridge journal, and a rotating Glyd ring is fitted between the piston and the non-filtration section of the filter cartridge.

[0010] Preferably, the circlip has multiple movable balls arranged in an annular array on its shaft end face, and the movable balls and the piston abut against each other to form a friction-reducing support structure.

[0011] Preferably, the cleaning component includes a spiral blade, a fixing frame, and an elastic scraper. The spiral blade is fixed to the outer wall of the filter cartridge, and the elastic scraper is installed on the inner wall of the filter housing through the fixing frame, with the brush body abutting against the outer cylindrical surface of the filter cartridge.

[0012] Preferably, a sludge collection tank is fitted and fixedly installed at the bottom of the filter housing, and a connecting pipe is connected to the bottom of the sludge collection tank. A control valve is installed at the lower end of the connecting pipe, and a sludge discharge pipe is connected to the control valve.

[0013] Preferably, the bottom of the sludge collection tank gradually decreases from the periphery to the center, and the lowest point of the tank bottom is connected to the connecting pipe.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] 1. This invention uses a purely mechanical differential pressure triggering mechanism and a coaxial clutch structure, and utilizes the original pump shaft extension of the lubrication pump as the rotational power. It drives the filter cartridge to engage and disengage axially by relying on the pressure difference inside and outside the filter cartridge. It does not require a motor or electronic control components, is suitable for wind power low temperature and strong electromagnetic interference conditions, reduces the number of failure points, and has a compact and reliable structure.

[0016] 2. This invention employs a dual cleaning mechanism of spiral blades and elastic scraper, using centrifugal separation and elastic scraper. The rotating spiral blades throw sand and dust into the bottom collection tank, while the scraper removes fine particles embedded in the filter holes, significantly increasing the filter element's dirt-holding capacity and extending the interval between high-altitude maintenance. Furthermore, under normal conditions, the clutch is disengaged, the filter cartridge is stationary, and the oil suction resistance is consistent with that of traditional fixed filters, thus avoiding the risk of cavitation in the lubrication pump from the source. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional schematic diagram of the filter housing of the present invention;

[0020] Figure 4 This is a cross-sectional schematic diagram of the piston and filter cartridge of the present invention;

[0021] Figure 5 for Figure 4 A partially enlarged schematic diagram of the structure at point A;

[0022] Figure 6 This is a schematic diagram of the structure of the sludge collection tank of the present invention;

[0023] Reference numerals in the attached drawings: 1. Pump body; 2. Filter housing; 3. Oil inlet pipe; 4. Piston; 5. Filter cartridge; 6. End cover; 7. Oil guide chamber; 8. Connecting rod; 9. Driven component; 10. Pump shaft extension; 11. Driving component; 12. Guide rod; 13. Spring; 14. Sealing ring; 15. Snap ring; 16. Moving ball; 17. Rotating Glyd ring; 18. Helical blade; 19. Fixing frame; 20. Elastic scraper; 21. Sludge collection tank; 22. Connecting pipe; 23. Control valve; 24. Sludge discharge pipe; 25. Flange. Detailed Implementation

[0024] Example 1, as Figure 1 - Figure 6As shown, the dustproof filtration device for wind power lubrication pump proposed in this embodiment includes a pump body 1, a filter housing 2, a filter cylinder 5, a pump shaft extension section 10, a purely mechanical differential pressure triggering mechanism, a one-way overrunning clutch, and a cleaning component. The filter housing 2 is a sealed cylindrical cavity with an oil inlet pipe 3 for connecting to the oil suction pipe at the left end and a flange 25 for connecting to the oil suction port of the pump body 1 at the right end. The filter cylinder 5 has an end cap 6 at one end near the oil inlet. The filter cylinder 5 is coaxially sleeved inside the filter housing 2, and the cylinder wall is the filter medium. The outer side of the filter cylinder 5 is the pre-filter chamber, and the inner side is the oil guide chamber 7. The oil flows radially from the outside to the inside through the filter cylinder 5 into the oil guide chamber 7 and then flows into the oil suction port of the pump body 1 through the flange 25.

[0025] The one-way overrunning clutch includes a driving element 11 and a driven element 9. A connecting rod 8 is fixedly connected to the center of the end cover 6 along the axial direction of the filter cartridge 5. The driving element 11 is fixed to the end of the pump shaft extension section 10, and the driven element 9 is fixed to the end of the connecting rod 8 near the driving element 11. The purely mechanical differential pressure triggering mechanism includes a piston 4, a guide rod 12, a spring 13, and a retaining ring 15. The piston 4 is slidably sealed and assembled on the inner wall of the filter housing 2. There are three guide rods 12 arranged in a ring array. One end of the guide rod 12 is fixed on the filter housing 2, and the other end is inserted into the interior of the piston 4 to restrict the rotation of the piston 4. The spring 13 is sleeved on the outside of the guide rod 12, and its two ends are respectively set on the piston 4 and the filter housing 2. Normally, it pushes the piston 4 to the left. The retaining ring 15 is coaxially set on the non-filtering section of the filter cartridge 5 and inserted into the inner side of the piston 4.

[0026] In this embodiment, the filter housing 2 is a cast horizontal cylindrical structure. The axis of the oil inlet pipe 3 is perpendicular to the axis of the filter housing 2 to avoid impacting the filter cylinder 5. The flange 25 is integrally welded to the right end of the filter housing 2. Multiple bolt holes are evenly opened on the flange 25. The flange is sealed with the oil suction port flange of the pump body 1 of the wind power lubrication pump through bolts to ensure connection strength and sealing reliability. The pump shaft extension section 10 is formed by extending the drive shaft inside the lubrication pump to the left. It is a shaft section that is coaxially fixed with the pump main shaft and rotates synchronously with the pump main shaft. The cylinder wall of the filter cylinder 5 is the filtering working surface. The oil can only pass through the filter material wall radially from the outer cylindrical surface of the filter cylinder 5 and enter the internal oil guide cavity 7. In the pure mechanical differential pressure triggering mechanism, the left end of the guide rod 12 is inserted into the guide hole corresponding to the piston 4 to ensure that the piston 4 can only slide back and forth along the axial direction and will not rotate circumferentially. A spring 13 is installed on each guide rod 12. The three springs 13 provide the reset elastic force together to ensure uniform force and stable reset.

[0027] When the device is working normally, the surface of the filter cartridge 5 is clean, the pressure difference between the pre-filter chamber and the oil guide chamber 7 is small, and the elastic force of the spring 13 is greater than the pressure difference force, keeping the piston 4 and the filter cartridge 5 in the left extreme position. At this time, the driving part 11 and the driven part 9 of the one-way overrunning clutch are completely disengaged axially and have no contact. The pump shaft extension section 10 only drives the driving part 11 to rotate freely, and the filter cartridge 5 remains stationary. The oil enters the pre-filter chamber from the oil inlet pipe 3, passes radially through the filter cartridge 5 to complete filtration, and then enters the oil guide chamber 7. It then flows into the pump body 1 through the flange 25. During the whole process, the filter cartridge is stationary, the oil suction resistance is low, and the risk of cavitation can be effectively avoided. When sand and dust accumulate on the surface of the filter cartridge 5 and the filtration resistance increases, the pre-filter chamber and the oil guide chamber... The pressure difference between 7 gradually increases. When the pressure difference reaches a certain level, the pressure difference force overcomes the elastic force of spring 13, pushing piston 4 to move to the right along guide rod 12. Piston 4, through the snap ring 15, causes filter cartridge 5 to move to the right synchronously, so that driven part 9 gradually fits into driving part 11, and then the one-way overrunning clutch engages. The power of pump shaft extension section 10 is transmitted to filter cartridge 5 through clutch, connecting rod 8 and end cover 6, driving filter cartridge to rotate and enter self-cleaning state. After cleaning, the flow capacity of filter cartridge 5 is restored, the pressure difference decreases, spring 13 pushes piston 4 and filter cartridge 5 to reset to the left, the clutch disengages, and filter cartridge 5 returns to static filtration state. The whole process is completed purely mechanically and adaptively, without the need for electrical control.

[0028] It should be noted that: the inner wall of the filter housing 2 has an annular protrusion structure, which can limit the maximum movement distance of the piston 4 during reset, preventing the guide rod 12 from disengaging from the piston 4. The one-way overrunning clutch adopts a wedge-type structure, mainly composed of the driving element 11 (inner clutch ring), the driven element 9 (outer clutch ring), wedges, a retainer, and spring plates. The outer cylindrical surface of the driving element 11 is machined with multiple wedge-shaped working surfaces, while the inner cylindrical surface of the driven element 9 is a smooth cylindrical surface. The wedges are evenly distributed in the annular gap between the driving element 11 and the driven element 9 through the retainer. The spring plates always push the wedges in the wedge-tightening direction. When the driving element 11... When the pump shaft extension 10 rotates in the working direction and the filter cartridge 5 moves to the right so that the driven member 9 enters the driving member 11, the wedge block automatically weds between the inner and outer rings under the action of friction and spring plate, transmitting the torque of the driving member 11 to the driven member 9, driving the filter cartridge 5 to rotate synchronously; when the filter cartridge 5 moves to the left to reset and the driven member 9 and the driving member 11 are axially disengaged, the power transmission is immediately interrupted, the filter cartridge 5 stops rotating, and the clutch only achieves wedging transmission in a single rotation direction. When rotating in the opposite direction, the wedge block automatically releases, and the inner and outer rings can rotate freely relative to each other without reverse dragging or jamming, effectively avoiding the impact of the filter cartridge 5's inertial rotation on the pump shaft.

[0029] Example 2, as Figure 3 - Figure 5As shown, the dust filter device for wind power lubrication pump proposed in this embodiment, compared with the first embodiment, has a sealing ring 14 installed between the piston 4 and the journal of the filter cartridge 5, a rotating Gladius ring 17 installed between the piston 4 and the non-filtering section of the filter cartridge 5, and multiple movable balls 16 arranged in an annular array on the shaft end face of the retaining ring 15. The movable balls 16 and the piston 4 abut against each other and form a friction-reducing support structure.

[0030] In this embodiment, two annular sealing grooves are provided on the outer ring wall of the piston 4, and sealing rings 14 are installed in the sealing grooves to ensure the sealing and isolation between the piston 4 and the filter housing 2. Side sealing grooves are provided on the inner ring wall of the piston 4, and rotating Glyd rings 17 are installed in the side sealing grooves. The combination structure of PTFE wear-resistant slip ring and O-ring is specially adapted to the relative motion condition of piston 4 being stationary and filter housing 5 rotating. It has excellent wear resistance and sealing performance, and can effectively prevent the high pressure oil in the pre-filter chamber and the low pressure oil in the oil guide chamber 7 from crossing the chamber, ensuring the stability of the differential pressure triggering mechanism.

[0031] Multiple hemispherical grooves are provided on the right end face of the retaining ring 15. Movable balls 16 are installed in the grooves. The movable balls 16 are made of hard alloy or stainless steel and can roll freely in the grooves. The right spherical surface of the movable ball 16 protrudes from the end face of the retaining ring 15 and rolls in contact with the inner side of the left end face of the piston 4. This transforms the traditional end face sliding friction into rolling friction, which greatly reduces frictional resistance. This ensures the reliable transmission of axial thrust and reduces wear and heat generation when the filter cartridge 5 rotates, thereby improving the operating sensitivity and service life of the mechanism.

[0032] Example 3, as Figure 3 and Figure 6 As shown, the dust filter device for wind power lubrication pump proposed in this embodiment, compared with the first embodiment, the cleaning component in this embodiment includes a spiral blade 18, a fixing frame 19 and an elastic scraper 20. The spiral blade 18 is fixed to the outer wall of the filter cylinder 5, and the elastic scraper 20 is installed on the inner wall of the filter shell 2 through the fixing frame 19. The brush body abuts against the outer cylindrical surface of the filter cylinder 5. A sludge collection tank 21 is fitted and fixedly provided at the bottom of the filter shell 2. The bottom of the sludge collection tank 21 is connected to a connecting pipe 22. A control valve 23 is installed at the lower end of the connecting pipe 22. The control valve 23 is connected to a slag discharge pipe 24. The bottom of the sludge collection tank 21 gradually decreases from the periphery to the center. The lowest point of the bottom of the tank is connected to the connecting pipe 22.

[0033] In this embodiment, the spiral blade 18 is a continuous spiral structure, made of stainless steel and welded and fixed to the outer cylindrical surface of the filter cylinder 5. A gap is reserved between the outer diameter of the blade and the inner wall of the filter shell 2. When the filter cylinder 5 rotates, the spiral blade 18 drives the oil in the pre-filter chamber to form an axial swirling flow field. The solid particles in the oil are thrown towards the inner wall of the filter shell 2 under the action of centrifugal force and settle down along the cylinder wall to achieve swirling centrifugal separation. The bristles of the elastic scraper brush 20 are made of oil-resistant and wear-resistant nylon or stainless steel, and the end is elastically abutted against the outer cylindrical surface of the filter cylinder 5. When the filter cylinder rotates, the elastic scraper brush 20 forms relative motion with the surface of the filter cylinder 5, scraping away the fine sand and dust particles embedded in the pores of the filter material. With the help of the swirling action, the particles are carried into the bottom collection tank 21. The elastic scraper brush 20 is fixed axially to the top position of the inner wall of the filter shell 2 by multiple sets of fixing brackets 19. The fixing brackets 19 are connected to the inner wall of the filter shell 2 by bolts or snap-fit, which facilitates installation and replacement.

[0034] The sludge collection tank 21 has an arc-shaped trough structure and is fitted into the opening at the bottom of the filter shell 2. The bottom of the sludge collection tank 21 is funnel-shaped and gradually decreases from the periphery to the center. A sludge discharge hole is opened at the lowest point of the bottom of the tank and connected to the connecting pipe 22, so that the settled sand and dust can be collected towards the center and the sludge residue in the tank can be avoided. A normally closed control valve 23 is installed at the lower end of the connecting pipe 22. The outlet of the control valve 23 is connected to the slag discharge pipe 24, which extends to the sedimentation area at the bottom of the lubricating oil tank.

[0035] It should be noted that the control valve 23 adopts a differential pressure automatic drain valve structure with a built-in drain valve core and drain spring. When the accumulated dirt in the collection tank 21 reaches a certain amount and the pressure difference between the inside and outside of the tank reaches the set threshold, the valve core automatically opens to drain the dirt. After the accumulated dirt is discharged, the pressure difference drops and the valve core automatically resets and closes. This technology, as well as the aforementioned one-way overrunning clutch technology, are all existing mature technologies, so they will not be explained in detail.

[0036] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A dustproof filter device for a wind power lubrication pump, comprising a pump body (1) and a filter housing (2), wherein the filter housing (2) is a sealed cylindrical cavity and has an oil inlet pipe (3) for connecting to the oil suction pipe at its left end, and a flange (25) for connecting to the oil suction port of the pump body (1) at its right end, characterized in that, It also includes a filter cartridge (5), a pump shaft extension section (10), a purely mechanical differential pressure triggering mechanism, a one-way overrunning clutch and a cleaning component. The filter cartridge (5) is provided with an end cap (6) at one end near the oil inlet. The filter cartridge (5) is coaxially sleeved inside the filter housing (2) and the cylinder wall is the filter medium. The outer side of the filter cartridge (5) is the pre-filter chamber and the inner side is the guide oil chamber (7). The oil flows radially from the outside to the inside through the filter cartridge (5) into the guide oil chamber (7) and then flows into the pump body (1) through the flange (25) to the oil suction port.

2. The dust filter for a wind turbine lubrication pump according to claim 1, characterized in that, The one-way overrunning clutch includes a driving member (11) and a driven member (9). A connecting rod (8) is fixedly connected to the center of the end cover (6) along the axial direction of the filter cartridge (5). The driving member (11) is fixed to the end of the pump shaft extension section (10), and the driven member (9) is fixed to the end of the connecting rod (8) near the driving member (11).

3. The dust filter for a wind turbine lubrication pump according to claim 1, characterized in that, The purely mechanical differential pressure triggering mechanism includes a piston (4), a guide rod (12), a spring (13), and a retaining ring (15). The piston (4) is slidably sealed and assembled on the inner wall of the filter shell (2). There are three guide rods (12) arranged in a ring array. One end of the guide rod (12) is fixed on the filter shell (2) and the other end is inserted into the inside of the piston (4) to restrict the rotation of the piston (4). The spring (13) is sleeved on the outside of the guide rod (12) and its two ends are respectively set on the piston (4) and the filter shell (2). Normally, it pushes the piston (4) to the left. The retaining ring (15) is coaxially set on the non-filtering section of the filter cylinder (5) and inserted into the inner side of the piston (4).

4. The dust filter for a wind turbine lubrication pump according to claim 3, characterized in that, A sealing ring (14) is fitted between the piston (4) and the journal of the filter cartridge (5), and a rotating glyph (17) is fitted between the piston (4) and the non-filtering section of the filter cartridge (5).

5. The dust filter for a wind turbine lubrication pump according to claim 3, characterized in that, Multiple movable balls (16) arranged in a ring array are provided on the shaft end face of the retaining ring (15). The movable balls (16) and the piston (4) abut against each other and form a friction-reducing support structure.

6. The dust filter for a wind turbine lubrication pump according to claim 1, characterized in that, The cleaning components include a spiral blade (18), a fixing frame (19), and an elastic scraper (20). The spiral blade (18) is fixed to the outer wall of the filter cartridge (5), and the elastic scraper (20) is installed on the inner wall of the filter housing (2) through the fixing frame (19). The brush body abuts against the outer cylindrical surface of the filter cartridge (5).

7. The dust filter for a wind turbine lubrication pump according to claim 6, characterized in that, The bottom of the filter housing (2) is fitted with a sludge collection tank (21), the bottom of the sludge collection tank (21) is connected to a connecting pipe (22), the lower end of the connecting pipe (22) is equipped with a control valve (23), and the control valve (23) is connected to a slag discharge pipe (24).

8. The dust filter for a wind turbine lubrication pump according to claim 7, characterized in that, The bottom of the sludge collection tank (21) gradually decreases from the periphery to the center, and the lowest point of the bottom is connected to the connecting pipe (22).

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