Pressure regulated overflow valve

Abstract

The application relates to the technical field of overflow valves, and discloses an overflow valve based on pressure regulation. Through the arrangement of a dredging assembly and a driving assembly, when the long-time-used overflow valve starts to work, the dredging rod of the dredging assembly is inserted into the blocked damping hole small end in the process that the main valve core is opened, meanwhile, the driving rack of the driving assembly is driven by the main valve core, so that the dredging rod is rotated in the process of dredging the damping hole small end, the oil dirt attached to the inner wall of the damping hole small end is scraped by the spiral distributed cleaning scraping pieces on the dredging rod, the oil dirt is broken into small pieces, and when the cleaning scraping pieces are rotated, the oil dirt pieces are mixed in the oil liquid and are extracted from the damping hole, and are discharged through a pilot valve, so that the blocked damping hole is dredged, the opening pressure is recovered, and the main valve core can be effectively closed after being opened.

Description

Technical Field

[0001] This invention relates to the field of relief valve technology, specifically a pressure-regulated relief valve. Background Technology

[0002] Chinese patent CN211901706U discloses a guide-type relief valve, which reduces the impact force of oil on the valve stem and increases the service life of the relief valve. However, after prolonged use, the oil in the relief valve will accumulate grease. In order to create a pressure difference on both sides of the main valve core during relief, thereby opening the main valve core, the two ends of the damping orifice on the main valve core have different diameters. The smaller end of the damping orifice is very easy to be blocked by grease adhering to the inner wall. When the damping orifice of the main valve core is blocked, its opening pressure will be significantly reduced, and the opened main valve core will be difficult to close effectively, thus causing the relief valve to malfunction. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a pressure-regulated relief valve that has the advantages of clearing blocked damping orifices, restoring opening pressure, and ensuring effective closure of the main valve core after opening. It solves the problem that the small end of the damping orifice is easily clogged by oil residue on its inner wall. When the damping orifice of the main valve core is clogged, its opening pressure will be significantly reduced, and the main valve core will be difficult to close effectively after opening, thus causing the relief valve to malfunction.

[0004] To address the technical problem that the small end of the damping orifice is easily clogged by grease adhering to the inner wall, thus preventing the overflow valve from functioning properly, this invention provides the following technical solution: A pressure-regulated overflow valve, comprising a main valve body, wherein a main chamber, an oil inlet, and an oil outlet are respectively opened within the main valve body, the oil inlet and the oil outlet being sequentially connected to one side of the main chamber, characterized in that: a pilot valve, a dredging component, a driving component, and a cleaning component are provided on the main valve body; a main valve core is installed in the main chamber, the main valve core closing the channel between the oil inlet and the oil outlet; a damping orifice is opened on the main valve core; the pilot valve is installed at the upper end of the main valve body and communicates with the main chamber; both the pilot valve and the main valve core have... The system includes an oil passage for oil supply. When the pressure is balanced, oil enters the main chamber from the inlet, passes through the damping orifice into the pilot valve, opens the main valve core, and discharges the oil from the outlet. The unblocking assembly includes a unblocking rod connected to the pilot valve and corresponding to the damping orifice. The drive assembly includes a drive rack and a worm gear. The drive rack is connected to the main valve core and engages with the unblocking rod via the worm gear. When the main valve core opens, it moves toward the pilot valve, causing the damping orifice to move toward the unblocking rod and driving the drive rack. The drive rack then drives the worm gear to rotate, causing the unblocking rod to rotate as it moves toward the damping orifice, thus unblocking the orifice.

[0005] Preferably, the lower end of the unclogging rod is tapered, and a scraper is fixedly connected to the outer side of the unclogging rod. The scraper extends spirally upward from the bottom of the unclogging rod to the bottom side of the pilot valve. The outer side of the scraper is in contact with the inner wall of the small end of the damping hole. A turbine is coaxially fixedly connected to the upper end of the unclogging rod.

[0006] Preferably, the pilot valve has a mounting groove at its bottom, a connecting seat is fixedly connected in the mounting groove, the upper end of the unblocking rod is rotatably mounted on the connecting seat, a cover plate is fixedly installed at the bottom of the mounting groove, the cover plate is located below the connecting seat, the unblocking rod passes through the cover plate, a fixing seat is provided in the mounting groove, the fixing seat is fixedly connected to the cover plate and located on one side of the unblocking rod, and a through groove is provided on the cover plate, the through groove is located on one side of the fixing seat.

[0007] Preferably, the worm gear is rotatably mounted on the fixed base and cooperates with the turbine. One end of the worm gear is coaxially and fixedly connected to a driven gear. The lower end of the drive rack is fixedly connected to the main valve core. The upper end of the drive rack extends into the mounting groove through the through groove, and the drive rack meshes with the driven gear.

[0008] Preferably, the cleaning assembly is installed at the bottom of the pilot valve and engages with the tooth surface of the drive rack. The cleaning assembly includes a scraper, with rotating shafts fixedly connected to both sides of the scraper. The scraper is rotatably mounted at the lower end of the through groove via the rotating shafts. A torsion spring is sleeved on the rotating shaft, and the torsion spring abuts against the side of the scraper and the inner wall of the through groove. The scraper rests in the tooth gap of the drive rack.

[0009] Preferably, a main valve seat is fixedly installed in the main chamber, the main valve seat is located between the oil inlet and the oil outlet, the main valve seat has a channel connecting the oil inlet and the oil outlet, the lower end of the main valve core abuts against the main valve seat to block the channel connecting the oil inlet and the oil outlet, the upper end of the main valve core has a spring groove, a main valve spring is installed in the spring groove of the main valve core, and the two ends of the main valve spring abut against the bottom of the pilot valve and the bottom of the spring groove, respectively.

[0010] Preferably, the pilot valve is provided with a pilot valve seat and a pilot cone valve core. The pilot valve seat is fixedly installed at one end of the pilot valve. The pilot valve is connected to the main chamber through the pilot valve seat. The pilot cone valve core is slidably installed in the pilot valve and located on one side of the pilot valve seat.

[0011] Preferably, the pilot valve is further provided with an adjusting rod, which is movably installed inside the pilot valve on one side of the pilot cone valve core. One end of the adjusting rod is fixedly connected to one side of the pilot cone valve core with a pressure adjusting spring. The pressure adjusting spring pushes the pilot cone valve core to seal the pilot valve seat. The other end of the adjusting rod is fixedly connected to a pressure adjusting bolt. The other end of the pressure adjusting bolt extends out of the pilot valve and is coaxially fixedly connected to a handwheel.

[0012] Preferably, the bottom of the main valve body is provided with a removable sealing cover, which is fixedly installed in the main chamber to seal the bottom of the main chamber.

[0013] Compared with the prior art, the present invention provides a pressure-regulated relief valve, which has the following advantages:

[0014] 1. This pressure-regulated overflow valve, through the design of the unblocking component and the drive component, allows the unblocking rod of the unblocking component to insert into the blocked damping orifice when the overflow valve, which has been in use for a long time, starts to work. During the opening of the main valve core, the unblocking rod is driven by the main valve core to rotate the unblocking rod in the process of unblocking the small end of the damping orifice. The spirally distributed cleaning blades on the unblocking rod scrape off the grease adhering to the inner wall of the small end of the damping orifice, breaking large pieces of grease into smaller pieces. As the spirally distributed cleaning blades rotate, they mix the grease fragments with the oil and pull them out of the damping orifice, which are then discharged through the pilot valve. This process unblocks the damping orifice, restores the opening pressure, and ensures that the main valve core can close effectively after opening.

[0015] 2. This pressure-regulated overflow valve, through the setting of the cleaning component, before the drive gear with oil deposits enters the mounting groove to drive the transmission gear, the scraper, with the cooperation of the torsion spring and the drive rack, squeezes out the oil deposits blocking the tooth gaps of the drive rack, so that the drive rack will not cause abnormalities when driving the transmission gear afterwards, thereby ensuring the normal operation of the drive component and increasing the service life of the overflow valve. Attached Figure Description

[0016] Figure 1 This is a front cross-sectional view of the present invention;

[0017] Figure 2 This is a schematic diagram of the right side structure of the present invention;

[0018] Figure 3 This is a schematic cross-sectional view of the right side of the present invention;

[0019] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point A;

[0020] Figure 5 This is a schematic diagram of the left side structure of the present invention;

[0021] Figure 6 This is a schematic diagram of the left cross-sectional structure of the present invention;

[0022] Figure 7 This is a schematic diagram of the structure of components such as the unblocking component and the driving component of the present invention;

[0023] Figure 8 This is an exploded structural diagram of the cleaning components and other parts of the present invention.

[0024] In the diagram: 1. Main valve body; 11. Main chamber; 12. Oil inlet; 13. Oil outlet; 14. Sealing cover; 2. Main valve core; 21. Damping orifice; 22. Main valve spring; 3. Main valve seat; 4. Pilot valve; 41. Mounting groove; 411. Connecting seat; 42. Pilot valve seat; 43. Pilot cone valve core; 44. Adjusting rod; 45. Pressure adjusting spring; 46. Pressure adjusting bolt; 47. Handwheel; 5. Cover plate; 51. Fixed seat; 52. Through groove; 6. Unblocking assembly; 61. Unblocking rod; 611. Scraper; 612. Turbine; 7. Drive assembly; 71. Worm gear; 72. Driven gear; 73. Drive rack; 8. Cleaning assembly; 81. Scraper; 82. Rotating shaft; 83. Torsion spring; 9. Oil passage. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1-8 A pressure-regulated relief valve includes a main valve body 1, which has a main chamber 11, an oil inlet 12, and an oil outlet 13. The oil inlet 12 and the oil outlet 13 are connected to one side of the main chamber 11. The main valve body 1 is equipped with a pilot valve 4, a dredging component 6, a drive component 7, and a cleaning component 8. A main valve core 2 is installed in the main chamber 11, which closes the passage between the oil inlet 12 and the oil outlet 13. The main valve core 2 has a damping orifice 21. The pilot valve 4 is installed at the upper end of the main valve body 1 and is connected to the main chamber 11. Both the pilot valve 4 and the main valve core 2 have oil passages 9 for oil supply. When the pressure is balanced, the oil enters the main chamber from the oil inlet 12. Inside chamber 11, the fluid enters the pilot valve 4 through the damping orifice 21, causing the main valve core 2 to open and discharge the oil from the drain port 13. The unblocking assembly 6 includes an unblocking rod 61, which is connected to the pilot valve 4 and corresponds to the damping orifice 21. The drive assembly 7 includes a worm gear 71 and a drive rack 73, which is connected to the main valve core 2. The drive rack 73 cooperates with the unblocking rod 61 through the worm gear 71. When the main valve core 2 opens, it moves toward the pilot valve 4, causing the damping orifice 21 to move toward the unblocking rod 61 and drive the drive rack 73. The drive rack 73 drives the worm gear 71 to rotate, causing the unblocking rod 61 to rotate as it moves toward the damping orifice 21, thus unblocking the damping orifice 21.

[0027] In operation, the relief valve is first installed in the hydraulic system, and the opening pressure of the pilot valve 4 is set. When the hydraulic system pressure is normal, both the pilot valve 4 and the main valve core 2 are closed. The oil entering the pilot valve 4 through the damping orifice 21 cannot open the pilot valve 4 because the pressure does not exceed the preset pressure value. The drive rack 73 on the main valve core 2 is immersed in the oil. After a long period of immersion, the oil residue will adhere to the drive rack 73, clogging the teeth. When the pressure in the hydraulic system reaches the preset pressure value of the pilot valve 4, the oil opens the pilot valve 4. The oil flows from the oil passage 9 of the pilot valve 4 into the main valve core 2, and then flows out through the oil passage 9 of the main valve core 2. This allows the oil to flow in the pilot valve 4, and under the action of the damping orifice 21, a pressure difference is generated on both sides of the upper end of the main valve core 2, driving the main valve core 2 to move towards the pilot valve 4 with the drive rack 73, thus connecting the inlet 12 and the outlet 12. The channel between the oil ports 13 is opened, and the drive rack 73 drives the unblocking rod 61 to rotate. Simultaneously, the rotating unblocking rod 61 moves into the damping hole 21. After entering the blocked small end of the damping hole 21, the rotating unblocking rod 61 scrapes out the grease adhering to the inner wall of the damping hole 21. During the movement of the drive rack 73, the cleaning component 8 cleans the tooth gaps of the drive rack 73. The flowing oil carries the cleaned grease out of the overflow valve, waiting for the main valve core 2... When fully open, the unblocking rod 61 extends from the damping hole 21, completing the unblocking of the damping hole 21. The drive rack 73 and the unblocking rod 61 stop moving. The oil flows from the inlet 12 into the outlet 13 through the open main valve core 2 for overflow. After the pressure in the hydraulic system is balanced, the pilot valve 4 closes, and the main valve core 2 closes the passage. During the closing process of the main valve core 2, the main valve core 2 pulls back the drive rack 73, and the unblocking rod 61 is pulled out from the damping hole 21, waiting for the next operation.

[0028] The difference from the above embodiment is that the lower end of the unblocking rod 61 is tapered, and a scraper 611 is fixedly connected to the outside of the unblocking rod 61. The scraper 611 extends spirally upward from the bottom of the unblocking rod 61 to the bottom side of the pilot valve 4. The outer side of the scraper 611 is in contact with the inner wall of the small end of the damping hole 21. A turbine 612 is coaxially fixedly connected to the upper end of the unblocking rod 61.

[0029] When unblocking the damping hole 21, the tip of the unblocking rod 61 allows it to better insert into the grease blocking the small end of the damping hole 21. During the cleaning process, the rotating unblocking rod 61 drives the scraper 611 to rotate, causing the scraper 611 to scrape off the grease adhering to the inner wall of the small end of the damping hole 21. During the scraping process, the rotating scraper 611 will break large pieces of grease into small pieces, and the spirally distributed scraper 611 will draw the oil upward, so that the scraped small pieces of grease will leave the damping hole 21 with the drawn oil and be discharged from the pilot valve 4.

[0030] The difference from the above embodiment is that the pilot valve 4 has a mounting groove 41 at the bottom, a connecting seat 411 is fixedly connected in the mounting groove 41, the upper end of the unblocking rod 61 is rotatably mounted on the connecting seat 411, a cover plate 5 is fixedly installed at the bottom of the mounting groove 41, the cover plate 5 is located below the connecting seat 411, the unblocking rod 61 passes through the cover plate 5, a fixing seat 51 is provided in the mounting groove 41, the fixing seat 51 is fixedly connected to the cover plate 5 and located on one side of the unblocking rod 61, and a through groove 52 is provided on the cover plate 5, the through groove 52 is located on one side of the fixing seat 51.

[0031] The difference from the above embodiment is that the worm 71 is rotatably mounted on the fixed seat 51 and cooperates with the turbine 612. One end of the worm 71 is coaxially fixedly connected to the driven gear 72, the lower end of the drive rack 73 is fixedly connected to the main valve core 2, and the upper end of the drive rack 73 extends into the mounting groove 41 through the through groove 52, and the drive rack 73 meshes with the driven gear 72.

[0032] When the main valve core 2 drives the drive rack 73 to move, the drive rack 73 drives the driven gear 72 that meshes with it, which in turn drives the worm gear 71 to rotate on the fixed seat 51, causing the turbine 612 to drive the unblocking rod 61 on the connecting seat 411 to rotate.

[0033] The difference from the above embodiment is that the cleaning component 8 is installed at the bottom of the pilot valve 4 and cooperates with the tooth surface of the drive rack 73. The cleaning component 8 includes a scraper 81, and a rotating shaft 82 is fixedly connected to both sides of the scraper 81. The scraper 81 is rotatably installed at the lower end of the through groove 52 through the rotating shaft 82. A torsion spring 83 is sleeved on the rotating shaft 82. The torsion spring 83 abuts against the side of the scraper 81 and the inner wall of the through groove 52. The scraper 81 rests in the tooth gap of the drive rack 73.

[0034] When the drive rack 73 is stationary, the scraper 81 rests in a tooth slot of the drive rack 73 located in the through groove 52. When the drive rack 73 moves, it drives the scraper 81 resting in the tooth slot to move in the same direction, and causes the torsion springs 83 on the rotating shafts 82 on both sides of the scraper 81 to store force. When the scraper 81 rotates to a certain height, it will disengage from the tooth slot. At this time, the stored torsion springs 83 are released, causing the scraper 81 to move in the opposite direction, thereby getting into the next tooth slot and squeezing out the oil stains blocking the tooth slot, so that the transmission between the drive rack 73 and the driven gear 72 is not affected.

[0035] The difference from the above embodiment is that a main valve seat 3 is fixedly installed in the main chamber 11. The main valve seat 3 is located between the oil inlet 12 and the oil outlet 13. A channel connecting the oil inlet 12 and the oil outlet 13 is opened on the main valve seat 3. The lower end of the main valve core 2 abuts against the main valve seat 3, blocking the channel connecting the oil inlet 12 and the oil outlet 13. A spring groove is opened at the upper end of the main valve core 2. A main valve spring 22 is installed in the spring groove of the main valve core 2. The two ends of the main valve spring 22 abut against the bottom of the pilot valve 4 and the bottom of the spring groove, respectively.

[0036] When the main valve core 2 is closed, the main valve spring 22 pushes the main valve core 2 downward, so that the lower end of the main valve core 2 is tightly against the main valve seat 3, thus closing the passage. When there is a pressure difference between the upper and lower sides of the main valve core 2, the main valve core 2 moves towards the pilot valve 4 under the push of the oil. The lower end of the main valve core 2 disengages from the main valve seat 3, opening the closed passage and compressing the main valve spring 22. After the overflow is completed, the pressure pushing the main valve core 2 disappears, causing the compressed main valve spring 22 to push the main valve core 2 downward again, so that it is tightly against the main valve seat 3, closing the passage again.

[0037] The difference from the above embodiment is that the pilot valve 4 is provided with a pilot valve seat 42 and a pilot cone valve core 43. The pilot valve seat 42 is fixedly installed at one end of the pilot valve 4, and the pilot valve 4 is connected to the main chamber 11 through the pilot valve seat 42. The pilot cone valve core 43 is slidably installed in the pilot valve 4 and is located on one side of the pilot valve seat 42.

[0038] The difference from the above embodiment is that an adjusting rod 44 is also provided inside the pilot valve 4. The adjusting rod 44 is movably installed inside the pilot valve 4 on one side of the pilot cone valve core 43. One end of the adjusting rod 44 is fixedly connected to one side of the pilot cone valve core 43 with a pressure adjusting spring 45. The pressure adjusting spring 45 pushes the pilot cone valve core 43 to block the pilot valve seat 42. The other end of the adjusting rod 44 is fixedly connected to the pressure adjusting bolt 46. The other end of the pressure adjusting bolt 46 extends out of the pilot valve 4, and a handwheel 47 is coaxially fixedly connected to it.

[0039] When the pilot valve 4 is preset to a pressure value, the handwheel 47 is rotated in the opposite direction, causing the handwheel 47 to drive the pressure adjusting bolt 46 to rotate in the opposite direction within the pilot valve 4, extending it to its maximum length. This allows the adjusting rod 44 to relax its pressure on the pressure adjusting spring 45 to the maximum extent. Subsequently, the oil pushes the pilot cone valve core 43 towards the adjusting rod 44, thereby opening the pilot valve seat 42 and allowing the oil to flow out of the pilot valve 4. At this time, the pressure on the pressure adjusting spring 45 is at its minimum pressure. Then, the pressure is adjusted forward as needed. Turning the handwheel 47 causes the pressure adjusting bolt 46 to push the adjusting rod 44 to move a corresponding distance toward the pilot cone valve core 43, which is lifted by the oil. This compresses the pressure adjusting spring 45, increasing the pressure on the spring 45 to the preset value. Then, stop turning the handwheel 47 to complete the preset pressure value. Subsequently, close the pilot valve 4 to put the relief valve into use. When the pressure value of the hydraulic system exceeds the preset value, the pilot valve 4 opens, controlling the main valve body 1 to overflow and restore the pressure of the hydraulic system to normal.

[0040] The difference from the above embodiment is that a removable sealing cover 14 is provided at the bottom of the main valve body 1. The sealing cover 14 is fixedly installed in the main chamber 11 to seal the bottom of the main chamber 11.

[0041] When maintaining the overflow valve, the interior of the main valve body 1 can be maintained by removing the sealing cover 14 from the main valve body 1.

[0042] Working principle: In use, first install the relief valve in the hydraulic system, and turn the handwheel 47 in the opposite direction. This causes the handwheel 47 to drive the adjusting bolt 46 to rotate in the pilot valve 4 in the opposite direction, extending it to its maximum length from the pilot valve 4. This allows the adjusting rod 44 to relax its pressure on the adjusting spring 45 to the maximum extent. Subsequently, the oil pushes the pilot cone valve core 43 towards the adjusting rod 44, thereby opening the pilot valve seat 42 and allowing the oil to flow out of the pilot valve 4. At this time, the pressure on the adjusting spring 45 is at its minimum pressure. Then, turn the handwheel 47 in the forward direction as needed, causing the adjusting bolt 46 to push the adjusting rod 45... 4. Move the pilot cone valve core 43, which is lifted by the oil, a corresponding distance is moved, thereby compressing the pressure regulating spring 45. After the pressure of the pressure regulating spring 45 increases to the preset value, stop turning the handwheel 47, thereby completing the preset pressure value. Then close the pilot valve 4 and put the relief valve into use. When the pressure of the hydraulic system is in a normal state, the oil that enters the pilot valve 4 through the damping hole 21 cannot open the pilot valve 4 because the pressure does not exceed the preset pressure value. Its main valve spring 22 pushes the main valve core 2 downward, so that the lower end of the main valve core 2 is tightly pressed against the main valve seat 3, and the passage is closed.

[0043] The drive rack 73 on the main valve core 2 is immersed in oil. After prolonged immersion, oil residue will adhere to the drive rack 73, clogging its teeth. When the pressure in the hydraulic system reaches the preset pressure value of the pilot valve 4, the oil opens the pilot valve 4. The oil in the pilot valve 4 then enters the main valve core 2 through the oil passage 9 and is discharged through the oil passage 9 of the main valve core 2. This allows the oil to flow within the pilot valve 4, creating a pressure difference on both sides of the upper end of the main valve core 2 under the action of the damping orifice 21. Driven by the oil, the main valve core 2 moves the drive rack 73 towards the pilot valve 4. The lower end of the main valve core 2 disengages from the main valve seat 3, opening the closed passage and compressing the main valve spring 22. The drive rack 73 then drives the meshing... Driven gear 72 drives worm gear 71 to rotate on fixed seat 51, causing turbine 612 to drive unclogging rod 61 on connecting seat 411 to rotate. At the same time, the rotating unclogging rod 61 moves into damping hole 21. The rotating unclogging rod 61 enters the blocked small end of damping hole 21. The tip of unclogging rod 61 allows it to better insert into the grease blocking the small end of damping hole 21. During the cleaning process, the rotating unclogging rod 61 drives scraper blade 611 to rotate, so that scraper blade 611 scrapes off the grease adhering to the inner wall of the small end of damping hole 21. During the scraping process, the rotating scraper blade 611 will scrape large pieces of grease into small pieces, and the spirally distributed scraper blade 611 will draw the oil upward, so that the scraped small pieces of grease will leave the damping hole 21 with the drawn oil.

[0044] When the drive rack 73 is stationary, the scraper 81 rests in one of the teeth of the drive rack 73 located in the through groove 52. When the drive rack 73 moves, it drives the scraper 81 resting in the tooth slot to move in the same direction, and causes the torsion springs 83 on the rotating shafts 82 on both sides of the scraper 81 to store force. When the scraper 81 rotates to a certain height, it will disengage from the tooth slot. At this time, the stored torsion springs 83 are released, causing the scraper 81 to move in the opposite direction, thereby getting into the next tooth slot and squeezing out the oil sludge blocking the tooth slot. This ensures that the transmission between the drive rack 73 and the driven gear 72 is not affected. The flowing oil carries the cleaned oil sludge out of the overflow valve. When the main valve core 2 is fully open, the unblocking rod 61 extends out of the damping hole 21. After clearing the damping orifice 21, the drive rack 73 and the clearing rod 61 stop moving. The oil flows from the inlet 12 into the outlet 13 through the opened main valve core 2 for overflow. After the overflow is completed, the pressure in the hydraulic system is balanced again, the pilot valve 4 closes, and the pressure pushing the main valve core 2 disappears, causing the compressed main valve spring 22 to push the main valve core 2 downward again, so that it tightly abuts against the main valve seat 3, closing the passage again. During the closing process of the main valve core 2, the main valve core 2 pulls back the drive rack 73, and the clearing rod 61 is pulled out from the damping orifice 21, waiting for the next operation. When maintaining the overflow valve, the internal parts of the main valve body 1 can be maintained by removing the sealing cover 14 from the main valve body 1.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure-regulated relief valve, comprising a main valve body, wherein a main chamber, an oil inlet, and an oil outlet are respectively provided within the main valve body, the oil inlet and the oil outlet being sequentially connected to one side of the main chamber, characterized in that: The main valve body is equipped with a pilot valve, a dredging component, a drive component, and a cleaning component. A main valve core is installed in the main chamber, closing the passage between the oil inlet and the oil outlet. The main valve core has a damping orifice. The pilot valve is installed on the upper end of the main valve body and communicates with the main chamber. Both the pilot valve and the main valve core have oil passages for oil supply. When the pressure is balanced, oil enters the main chamber from the oil inlet, passes through the damping orifice into the pilot valve, causing the main valve core to open and allowing oil to flow from the inlet / outlet. Oil is discharged from the drain port. The unblocking assembly includes an unblocking rod connected to the pilot valve and corresponding to the damping orifice. The driving assembly includes a worm gear and a driving rack connected to the main valve core. The driving rack cooperates with the unblocking rod through the worm gear. When the main valve core is opened, it moves toward the pilot valve, causing the damping orifice to move toward the unblocking rod and driving the driving rack. The driving rack drives the worm gear to rotate, causing the unblocking rod to rotate as it moves into the damping orifice, thus unblocking the damping orifice. The upper end of the unblocking rod is coaxially fixedly connected to a worm gear; The pilot valve has a mounting groove at its bottom, and a connecting seat is fixedly connected in the mounting groove. The upper end of the unblocking rod is rotatably mounted on the connecting seat. A cover plate is fixedly installed at the bottom of the mounting groove, and the cover plate is located below the connecting seat. The unblocking rod passes through the cover plate. A fixing seat is provided in the mounting groove, and the fixing seat is fixedly connected to the cover plate and located on one side of the unblocking rod. A through groove is provided on the cover plate, and the through groove is located on one side of the fixing seat. The worm gear is rotatably mounted on the fixed seat and cooperates with the worm wheel. One end of the worm gear is coaxially and fixedly connected to a driven gear. The lower end of the drive rack is fixedly connected to the main valve core. The upper end of the drive rack extends into the mounting groove through the through groove, and the drive rack meshes with the driven gear. The cleaning assembly is installed at the bottom of the pilot valve and engages with the tooth surface of the drive rack. The cleaning assembly includes a scraper, with rotating shafts fixedly connected to both sides of the scraper. The scraper is rotatably mounted at the lower end of the through groove via the rotating shafts. A torsion spring is sleeved on the rotating shaft, and the torsion spring abuts against the side of the scraper and the inner wall of the through groove. The scraper rests in the tooth gap of the drive rack.

2. The relief valve based on pressure regulation according to claim 1, characterized in that: The lower end of the unblocking rod is tapered, and a scraper is fixedly connected to the outside of the unblocking rod. The scraper extends spirally upward from the bottom of the unblocking rod to the bottom of the pilot valve, and the outer side of the scraper is in contact with the inner wall of the small end of the damping hole.

3. The relief valve based on pressure regulation according to claim 1, characterized in that: A main valve seat is fixedly installed in the main chamber. The main valve seat is located between the oil inlet and the oil outlet. The main valve seat has a channel connecting the oil inlet and the oil outlet. The lower end of the main valve core abuts against the main valve seat, blocking the channel connecting the oil inlet and the oil outlet. The upper end of the main valve core has a spring groove. A main valve spring is installed in the spring groove of the main valve core. The two ends of the main valve spring abut against the bottom of the pilot valve and the bottom of the spring groove, respectively.

4. A pressure-regulating relief valve according to claim 3, characterized in that: The pilot valve is provided with a pilot valve seat and a pilot cone valve core. The pilot valve seat is fixedly installed at one end of the pilot valve. The pilot valve is connected to the main chamber through the pilot valve seat. The pilot cone valve core is slidably installed in the pilot valve and is located on one side of the pilot valve seat.

5. A pressure-regulating relief valve according to claim 4, characterized in that: The pilot valve is also equipped with an adjusting rod, which is movably installed inside the pilot valve on one side of the pilot cone valve core. One end of the adjusting rod is fixedly connected to one side of the pilot cone valve core with a pressure adjusting spring. The pressure adjusting spring pushes the pilot cone valve core to seal the pilot valve seat. The other end of the adjusting rod is fixedly connected to a pressure adjusting bolt. The other end of the pressure adjusting bolt extends out of the pilot valve and is coaxially fixedly connected to a handwheel.

6. A pressure-regulating relief valve according to claim 5, characterized in that: The bottom of the main valve body is provided with a removable sealing cover, which is fixedly installed in the main chamber to seal the bottom of the main chamber.

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