A relief valve with overpressure protection function

Abstract

The present invention discloses a relief valve with an overpressure protection function, which belongs to the technical field of relief valves, and includes a valve body, an oil inlet and an oil outlet are provided inside the valve body, a connecting cavity is provided inside the valve body, a valve core is sleeved inside the connecting cavity, a damping hole is provided inside the valve core, and a pressure plug is provided inside the valve body. According to the present invention, when the damping hole is blocked, the pressure difference between the upper and lower parts of the valve core drives the driving block to store power and extend at a uniform speed, driving the rotating rod and the threaded strip to perform multi-directional composite movements such as forward rotation, ascending, descending and reverse rotation inside the damping hole, producing a shearing effect with full circumferential coverage inside the damping hole, cutting and refining the sediment inside the damping hole, cooperating with turbulent flow to accelerate transportation, avoiding secondary sedimentation, achieving an efficient dredging effect on the damping hole, timely eliminating the pressure difference between the upper and lower parts of the valve core, and timely responding to and unloading the oil circuit pressure through the pilot valve, avoiding damage to the mechanical structure caused by excessive pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of overflow valves, and in particular to an overflow valve with an overpressure protection function. Background Art

[0002] The overflow valve is also called a safety valve. As the name suggests, the safety valve is a key safety application guarantee for pressure pipes and pressure vessels. When the system pressure exceeds the specified value, the safety valve opens to discharge part of the fluid in the system so that the system pressure does not exceed the specified threshold, thereby ensuring that the system does not cause accidents due to excessive pressure. In the existing technology, the pilot overflow valve can transport hydraulic oil to the pilot valve above the valve block through the damping hole on the valve block. The pilot valve senses and adjusts the pressure to make corresponding precise unloading of the oil circuit.

[0003] However, in the prior art, when overpressure occurs in the pilot-operated relief valve, it is generally caused by the blockage of the damping flow hole on the valve block. During the long-term circulation of hydraulic oil, the parts inside the machine that have been impacted by the oil circuit for a long time, especially the sealing connections, are prone to debris. These debris are prone to accumulate and clog in the narrow passage such as the damping flow hole during the flow process, resulting in obstruction of the pressure transmission of the valve block, and the pressure in the oil circuit cannot be transmitted to the pilot valve in time, so that the oil circuit cannot be adjusted and unloaded in time, causing fatigue or even rupture damage to the machine and pipelines due to internal overpressure, which poses a major safety hazard. Summary of the Invention

[0004] In order to make up for the above deficiencies, the present invention provides a relief valve with an overpressure protection function, aiming to improve the problems raised by the above background technology.

[0005] The present invention is achieved in that:

[0006] The present invention provides a relief valve with an overpressure protection function, comprising a valve body, a communicating cavity being defined within the valve body, a valve core being sleeved within the communicating cavity, a damping hole being defined within the valve core, a pressure plug being disposed within the valve body, a spring being disposed between the pressure plug and the valve body, and a detection mechanism and a cleaning mechanism being disposed within the valve body;

[0007] The cleaning mechanism includes a rotating drum sleeved above the damping hole, a driving ring is provided on the inner side of the rotating drum, blades are connected between the driving ring and the rotating drum, a rotating rod is movably sleeved inside the driving ring, and a threaded strip is provided on the side wall of the rotating rod;

[0008] The detection mechanism includes a connecting pipe opened inside the valve body, with openings at both ends of the connecting pipe, one of which is opened on the side wall of the connecting cavity and located below the valve core, and the other end of the connecting pipe is opened at the top of the connecting cavity. A piston block is provided inside the connecting pipe, and the top opening of the connecting pipe is connected to a piston rod. Both the piston block and the piston rod are connected to a spring for resetting. A movable sleeve is fixedly installed inside the valve body, and the bottom of the piston rod is movably connected to the movable sleeve. The bottom of the movable sleeve is movably connected to a driving block, and a compression spring is provided between the movable sleeve and the driving block. A transmission assembly and a rotating assembly are provided inside the movable sleeve.

[0009] Preferably, the thread strip is designed to be spiral, and the thread strip is adapted to the inner side wall of the damping hole.

[0010] Preferably, the transmission assembly includes a card block sleeved on the side wall of the driving block, a spring is provided between the card block and the driving block, a rack is provided on the side wall of the driving block, a gear set is provided inside the communicating cavity, the input end of the gear set is meshed with the rack, the transmission shaft of the output gear of the gear set is connected to the camshaft, the side wall of the camshaft is connected to the connecting rod through a group of rotating shafts, the top of the rotating rod is connected to the driving sleeve, the driving sleeve is sleeved with the driving shaft, the top of the driving shaft is connected to the lifting plate, the lifting plate is connected to the connecting rod through the rotating shaft, a card slot is provided inside the movable sleeve, and a protective assembly is provided inside the movable sleeve.

[0011] Preferably, a groove is provided at the bottom of the piston rod, and the side wall of the clamping block is provided with a chamfered angle that matches the groove at the bottom of the piston rod.

[0012] Preferably, the rotating assembly includes a cavity and a driving groove opened inside the driving sleeve, a driving shaft is provided at the bottom of the lifting plate, a ball is provided on the outer wall of the driving shaft, and a sliding groove matching the ball is provided on the inner wall of the driving groove.

[0013] Preferably, the radius of the cavity is greater than the sum of the radii of the drive shaft and the ball, the number of the chute and the ball is the same, and the bottom opening of the chute is provided with a chamfered corner connected to the bottom opening of the adjacent chute.

[0014] Preferably, the protection component includes a gear group 2 arranged inside the connecting cavity, a rack 2 is provided on the side wall of the driving block, the rack 2 is meshed with the output end of the gear group 2, the transmission shaft of the output gear of the gear group 2 is connected to a reel, a pull rope is wrapped around the side wall of the reel, and the other end of the pull rope is connected to the top of the valve core.

[0015] Preferably, a second clamping groove corresponding to the clamping block is formed on the side wall of the movable sleeve, and the distance between the first clamping groove and the second clamping groove matches the length of the rack 1 in the vertical direction.

[0016] In summary, the beneficial effects of the present invention are:

[0017] 1. When the device is operating normally, when the oil circuit passes through the damping orifice, the driving force exerted on the blade by the oil passing through drives the threaded strip to rotate, automatically cleans the damping orifice, reduces the deposition of impurities when the oil flows through, reduces the risk of clogging of the damping orifice, and ensures the stability of the valve body operation; when the damping orifice is clogged, the pressure difference between the upper and lower parts of the valve core drives the drive block to accumulate force and extend at a uniform speed, and further, through the cooperation of the drive shaft and the drive sleeve, drives the rotating rod and the threaded strip to perform multi-directional compound movements such as forward rotation, ascending, descending and reverse rotation inside the damping orifice, producing a shearing effect covering the entire circumference of the damping orifice, cutting and refining the sediment inside the damping orifice, cooperating with turbulent flow to accelerate transportation, avoid secondary sedimentation, achieve efficient dredging effect of the damping orifice, timely eliminate the pressure difference between the upper and lower parts of the valve core, and timely respond to and unload the oil circuit pressure through the pilot valve to avoid damage to the mechanical structure caused by excessive pressure.

[0018] 2. When the pressure difference between the upper and lower parts of the valve core continues to increase after cleaning and there is a risk of overpressure, the pressure difference causes the piston block and the piston rod to move further, driving the drive block to continue to move downward, so that the rack 2 and the gear set 2 engage and transmit, driving the reel to rotate to reel in the pull rope, driving the valve core to rise slowly, so that a gap appears between the bottom of the valve core and the oil inlet, and the overpressure load is discharged through the oil drain port by the lifting of the valve core. When the pressure further increases and exceeds the threshold, forced automatic unloading can be achieved to avoid mechanical damage caused by excessive oil pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the valve body provided in an embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of the internal structure of the valve core provided in an embodiment of the present invention.

[0022] Figure 3 It is an overall schematic diagram of the piston rod structure provided by an embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the internal structure of the damping hole provided in an embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of the internal structure of the movable sleeve provided in an embodiment of the present invention.

[0025] Figure 6Schematic diagram of the interior of a driving block provided by an embodiment of the present invention.

[0026] Figure 7 2 is a schematic diagram of a rack transmission provided in an embodiment of the present invention.

[0027] Figure 8 It is a schematic diagram of the lifting plate transmission provided by an embodiment of the present invention.

[0028] Figure 9 It is a schematic diagram of the internal structure of the drive sleeve provided in an embodiment of the present invention.

[0029] Figure 10 Schematic diagram of rack 2 transmission provided by an embodiment of the present invention.

[0030] Legend:

[0031] 100, valve body; 101, oil inlet; 102, oil outlet; 103, valve core; 104, connecting chamber; 105, damping hole; 106, pressure plug; 200, connecting pipe; 201, piston block; 203, piston rod; 300, movable sleeve; 301, drive block; 302, compression spring; 303, clamping block; 304, clamping slot 1; 305, clamping slot 2; 306, rack 1; 307, gear 2; 400, rotating rod; 401, threaded strip; 402, rotating drum; 403, driving ring; 404, blade; 500, driving sleeve; 501, gear set 1; 502, camshaft; 503, connecting rod; 504, lifting plate; 505, driving shaft; 506, ball bearing; 507, slide groove; 508, cavity; 509, driving groove; 600, gear set 2; 601, reel; 602, pull rope. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0033] Reference Figures 1-10The present invention provides a relief valve with an overpressure protection function, including a valve body 100. The valve body 100 is provided with an oil inlet 101 and an oil outlet 102. The valve body 100 is provided with a communication cavity 104. The communication cavity 104 is sleeved with a valve core 103. The valve core 103 is provided with a damping hole 105. The communication cavity 104 is divided into two groups of cavities, an upper and a lower cavity, by the valve core 103. A pressure plug 106 is provided inside the valve body 100. A spring is provided between the pressure plug 106 and the valve body 100. The valve body 100 is provided with a detection mechanism and a cleaning mechanism.

[0034] The cleaning mechanism includes a rotating drum 402 sleeved above the damping hole 105. The rotating drum 402 is movably sleeved with the valve body 100 in a limited position and can maintain free rotation. A driving ring 403 is provided on the inner side of the rotating drum 402. A blade 404 is connected between the driving ring 403 and the rotating drum 402. A rotating rod 400 is movably sleeved inside the driving ring 403. The side wall of the rotating rod 400 is provided with a threaded strip 401.

[0035] The detection mechanism includes a connecting pipe 200 opened inside the valve body 100, with openings at both ends of the connecting pipe 200, one of which is opened on the side wall of the connecting cavity 104 and located below the valve core 103, and the other end of the connecting pipe 200 is opened at the top of the connecting cavity 104 facing the valve core 103, and a piston block 201 is provided inside the connecting pipe 200, and the top opening of the connecting pipe 200 is connected to the piston rod 203, and the piston block 201 and the piston rod 203 are both connected to springs for resetting, and a movable sleeve 300 is fixedly installed inside the valve body 100, and the bottom of the piston rod 203 is movably connected to the movable sleeve 300, and the bottom of the movable sleeve 300 is movably connected to the driving block 301, and a compression spring 302 is provided between the movable sleeve 300 and the driving block 301, and a transmission assembly and a rotating assembly are provided inside the movable sleeve 300.

[0036] Furthermore, the thread strip 401 is designed to be spiral, and the thread strip 401 is adapted to the inner side wall of the damping hole 105 .

[0037] Reference Figure 2-9The transmission assembly includes a card block 303 sleeved on the side wall of the driving block 301, a spring is provided between the card block 303 and the driving block 301, a rack 306 is provided on the side wall of the driving block 301, and a gear set 501 is provided inside the communicating chamber 104. The input end of the gear set 501 is meshed with the rack 306, and the transmission shaft of the output gear of the gear set 501 is connected to the camshaft 502. The side wall of the camshaft 502 is connected to the connecting rod 503 through a set of rotating shafts. It should be noted that the gear set 501 is composed of multiple groups of small gear sets meshing with each other, and the input end is close to the rack 306 and meshes with the rack 306. The top of the rotating rod 400 is connected to a driving sleeve 500, and the driving sleeve 500 is sleeved with a driving shaft 505. The top of the driving shaft 505 is connected to a lifting plate 504, and the lifting plate 504 is connected to the connecting rod 503 through a rotating shaft. A card slot 304 is opened inside the movable sleeve 300, and a protective component is provided inside the movable sleeve 300. There are two groups of transmission components, which are specifically symmetrically designed with the axis of the driving sleeve 500 as the reference, and are used to drive the lifting plates 504 to rise and fall on both sides of the driving sleeve 500 at the same time, thereby driving the driving sleeve 500 to rotate.

[0038] Furthermore, a groove is provided at the bottom of the piston rod 203 , and a side wall of the clamping block 303 is provided with a chamfered angle that matches the groove at the bottom of the piston rod 203 .

[0039] Reference Figure 9 The rotating component includes a cavity 508 and a driving groove 509 opened inside the driving sleeve 500, a driving shaft 505 is provided at the bottom of the lifting plate 504, a ball 506 is provided on the outer wall of the driving shaft 505, and a sliding groove 507 that cooperates with the ball 506 is opened on the inner wall of the driving groove 509.

[0040] 506 , and the bottom of the chute 507 is designed to be curved, so that the chute 506 is not blocked.

[0041] At the same time, since the internal diameter of the cavity 508 is relatively large, when the lifting plate 504 is stationary and does not rise, when the rotating rod 400 rotates, the connection between the drive sleeve 500 and the drive shaft 505 slides relative to each other. At the same time, the side wall of the cavity 508 does not contact the ball 506, ensuring the independence of the device during operation. Only when the drive shaft 505 moves in the vertical direction will it drive the drive sleeve 500 to rotate.

[0042] Reference Figure 2-10 The protection component includes a gear set 2 600 arranged inside the communicating cavity 104, and a rack 2 307 is provided on the side wall of the driving block 301. The rack 2 307 is meshed with the output end of the gear set 2 600. The transmission shaft of the output gear of the gear set 2 600 is connected with a reel 601. A pull rope 602 is wrapped around the side wall of the reel 601. The other end of the pull rope 602 is connected to the top of the valve core 103. It should be noted that the gear set 2 600 is composed of multiple groups of small gear sets meshing with each other. The input end is a group of gears close to the rack 2 307 and meshing with the rack 2 307, and the output end is a group of gears away from the rack 2 307.

[0043] It should be noted that the side wall of the movable sleeve 300 is provided with a second clamping groove 305 corresponding to the clamping block 303 , and the distance between the first clamping groove 304 and the second clamping groove 305 matches the length of the rack 1 306 in the vertical direction.

[0044] The working process of the relief valve with overpressure protection function is as follows:

[0045] The oil enters the connecting cavity 104 through the oil inlet 101, and further enters the top of the valve core 103 through the damping hole 105. If the pressure is too high, the pilot valve or the main valve can be opened for dynamic balance adjustment to release the pressure. In this process, when the oil passes through the top opening of the damping hole 105, the oil impacts the inclined blade 404, which can provide a tangential force for the blade 404, driving the blade 404 to rotate, and further driving the drive ring 403 and the rotating rod 400 to rotate. When the rotating rod 400 rotates, it can drive the threaded bar 401 to rotate synchronously, rotating the inner wall of the damping hole 105. Dynamic cleaning realizes automatic cleaning without external force, and the spiral design of the thread bar 401 performs axial cleaning on the inner wall to peel off attached impurities and sediments. At the same time, the rotation of the thread bar 401 produces a centrifugal rotation effect, which drives the impurities to pass through, realizes radial cleaning, and avoids the re-deposition of impurities. During normal operation, the driving force of the blade 404 when the oil passes through drives the thread bar 401 to rotate, automatically cleaning the damping hole 105, reducing the deposition of impurities when the oil flows through, reducing the blockage of the damping hole 105, and ensuring the stability of the valve body 100 operation.

[0046] When the valve body 100 has been running for a long time, the metal debris in the oil accumulates and causes the damping hole 105 to be gradually blocked. The oil enters through the oil inlet 101 and passes through the damping hole 105. Due to the blockage of the damping hole 105, the passage is blocked. The high pressure at the bottom of the valve core 103 is transmitted to the top of the valve core 103 through the flow of oil at a slow speed, resulting in a certain pressure difference between the upper and lower parts of the valve core 103. At this time, under the action of the pressure difference, the piston block 201 and the piston rod 203 gradually overcome the elastic force of the spring connected to them, and move from the lower opening of the valve core 103 to the upper opening of the valve core 103 in the connecting pipe 200. In this process, multiple groups of piston blocks 201 and piston rods 203 and the springs connected thereto play a role in overcoming the pressure of the valve core 1 After the piston rod 203 moves, the piston rod 203 pushes the driving block 301 downward toward the valve core 103 through the compression spring 302. When the blocking block 303 passes the blocking groove 104, the blocking block 303 extends and engages with the blocking groove 104 under the elastic force of the spring connected to the blocking block 303. When the piston rod 203 continues to move downward, the compression spring 302 is continuously compressed and stored until the groove at the bottom of the piston rod 203 contacts the inclined surface of the blocking block 303. Under the pushing action of the groove, the blocking block 303 moves toward the inside of the driving block 301 and disengages from the blocking groove 104. The driving block 301 that has disengaged from the blocking block 303 moves at a constant speed in the direction away from the piston rod 203 under the elastic force of the compression spring 302. When the driving block 301 is extended, the rack 306 on the side wall of the driving block 301 can drive the camshaft 502 to rotate through the gear set 501. When the camshaft 502 rotates, the two corresponding camshafts 502 and their corresponding cams move to drive the lifting plate 504 to reciprocate in the vertical direction. When the lifting plate 504 rises, when the driving shaft 505 passes through the driving groove 509, the ball 506 is quickly positioned into the slide groove 507 through the rounded corner at the bottom of the slide groove 507, and drives the driving sleeve 500 to rotate through the slide groove 507, thereby driving the rotating rod 400 to rotate, thereby driving the threaded strip 401 to rotate actively. When the driving shaft 505 moves to the highest point inside the driving groove 509, the lifting plate 504 continues to rise, and can also drive the driving sleeve 500 and the rotating rod 400 to rotate. The rod 400 moves a small distance in the vertical direction, and when the lifting plate 504 descends, the driving sleeve 500 and the rotating rod 400 first descend a distance in the vertical direction synchronously with the driving shaft 505. Further, when the driving shaft 505 descends and leaves the driving groove 509 area, the rotating rod 400 can be driven to rotate in the opposite direction through the cooperation of the ball 506 and the slide groove 507, so that the threaded strip 401 performs a multi-directional compound motion inside the damping hole 105. The inner wall of the damping hole 105 is impacted by the bidirectional spiral rotation of the threaded strip 401. Compared with unidirectional rotation, the sediment is easily subjected to unilateral stress concentration and is only easily pushed away rather than broken and dredged. The bidirectional rotation can alternately apply reverse shear stress to reduce the binding energy of impurities, and cooperate with the multi-directional shear superposition in the vertical direction.Achieving a shearing effect with full circumferential coverage is beneficial for the crushing of impurities rather than unidirectional rotational plastic deformation, thereby enhancing the destructive effect on the adhesion layer. Combined with the alternating forward and reverse rotation and the vertical reciprocating motion, the generated eddies in different directions form a turbulent burst at the moment of turning, which not only increases the shear rate but also reduces the sedimentation of the crushed impurities and reduces secondary deposition. The turbulent flow can accelerate the transport of impurities during the liquid flow and improve the dredging effect of silt blockage. When the oil inlet 101 is over-pressured, the damping hole 105 can be automatically cleared to ensure the flow of the damping hole 105, improve the stability of the pressure transmission between the upper and lower ends of the valve core 103, and avoid damage to the device caused by overpressure due to the inability to transmit the pressure load in time due to the blockage of the damping hole 105.

[0047] When the damping hole 105 is clogged and silted up, resulting in a large pressure difference between the upper and lower parts of the valve core 103, the upper and lower pressure differences of the valve core 103 drive the driving block 301 to accumulate force and extend at a uniform speed, and further, through the cooperation of the driving shaft 505 and the driving sleeve 500, drive the rotating rod 400 and the threaded bar 401 to perform multi-directional compound movements such as forward rotation, rising, falling and reverse rotation inside the damping hole 105, thereby producing a shearing effect covering the entire circumference of the damping hole 105, cutting and refining the sediment inside the damping hole 105, cooperating with turbulent flow to accelerate transportation, avoid secondary sedimentation, achieve efficient dredging effect on the damping hole 105, timely eliminate the upper and lower pressure differences of the valve core 103, and timely respond to and unload the oil circuit pressure through the pilot valve to avoid damage to the mechanical structure caused by excessive pressure.

[0048] It should be noted that the gap between the top of the driving block 301 and the inner wall of the movable sleeve 300 is small. Only a groove matching the bottom groove of the piston rod 203 is opened at the position of the blocking block 303, and the rest of the part is in contact with the inner wall of the movable sleeve 300. The side wall of the movable sleeve 300 is provided with multiple sets of pipe grooves. When the piston rod 203 moves down and compresses the compression spring 302, the hydraulic oil between the piston rod 203 and the piston block 201 can be slowly discharged. When it pops out under the elastic force of the compression spring 302, the hydraulic oil can be slowly sucked into the gap between the piston rod 203 and the driving block 301 through the pipe groove to fill the gap, so that the driving block 301 can be slowly extended, avoiding the driving block 301 from popping out quickly, thereby ensuring the stability of the device operation.

[0049] Furthermore, when the pressure difference between the upper and lower parts of the valve core 103 continues to increase after further cleaning, it indicates that the siltation and blockage inside the damping hole 105 has not been improved, and as the oil pressure inside the oil inlet 101 continues to increase, there is a risk of overpressure. At this time, the pressure difference between the upper and lower parts of the valve core 103 continues to increase, which can push the piston block 201 and the piston rod 203 to move further. In the above working process, the piston rod 203 pushes the block 303 into the interior of the driving block 301 through the compression of the compression spring 302, so that the driving block 301 During the downward movement, when the driving block 301 slides to the point where the card block 303 is engaged with the second card slot 305, the card block 303 will extend out and engage with the second card slot 305 under the action of the elastic force of the spring connected to the driving block 301. When the piston rod 203 continues to move, the compression spring 302 continues to compress until the groove at the bottom of the piston rod 203 contacts the oblique edge of the card block 303 again, pushing the card block 303 out of the engagement with the second card slot 305. At this time, the driving block 301 moves down again to the lowest point under the elastic force of the compression spring 302. The rack 2 307 is meshed with the gear set 2 600 to drive the reel 601 to rotate. The pull rope 602 is wound by the rotation of the reel 601, thereby driving the valve core 103 connected to the pull rope 602 to slowly rise. In addition, there are multiple groups of corresponding detection mechanisms, cleaning mechanisms, transmission components, rotating components and protection components evenly distributed along the valve core 103. Multiple groups of pull ropes 602 exert tension on the valve core 103 at the same time, which can move the valve core 103 upward, so that there is a gap between the bottom of the valve core 103 and the oil inlet 101. The overpressure load can be discharged through the oil discharge port 102 by utilizing the lifting of the valve core 103. When the pressure further increases and exceeds the threshold, timely automatic unloading can be achieved to avoid mechanical damage caused by excessive oil circuit pressure. After the oil circuit pressure returns to normal, automatic reset can be achieved through the elastic force of each group of springs. Among them, when the driving block 301 rises and resets, through the inclined surface design of the card block 303, when the driving block 301 rises and resets, the card block 303 can directly pass through the second card slot 305 and the first card slot 304 without any jamming phenomenon.

[0050] It should be noted that, through the design of the pressure plug 106, when the damping hole 105 is normally circulating and transmitting pressure, the internal liquid pressure of the oil inlet 101 can gradually increase after entering the top of the valve core 103, first compressing the pressure plug 106 and the spring connected to the pressure plug 106, and then transmitting the pressure to the pilot valve for normal adjustment and unloading. When the damping hole 105 is flowing and the pressure transmission is not smooth, the pressure plug 106 can provide a compression margin for the pressure difference transmission and detection through the connecting pipe 200, and provide a compression margin when the piston rod 203 moves toward the top of the valve core 103 and the valve core 103 moves upward, so that the internal compression of the valve core 103 is provided.

[0051] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A relief valve with an overpressure protection function, comprising a valve body (100), wherein an oil inlet (101) and an oil outlet (102) are provided inside the valve body (100), characterized in that: A communication cavity (104) is provided inside the valve body (100), a valve core (103) is sleeved inside the communication cavity (104), a damping hole (105) is provided inside the valve core (103), a pressure plug (106) is provided inside the valve body (100), a spring is provided between the pressure plug (106) and the valve body (100), and a detection mechanism and a cleaning mechanism are provided inside the valve body (100); The cleaning mechanism comprises a rotating drum (402) sleeved on the top of the damping hole (105), a driving ring (403) is provided on the inner side of the rotating drum (402), a blade (404) is connected between the driving ring (403) and the rotating drum (402), a rotating rod (400) is movably sleeved inside the driving ring (403), and a threaded strip (401) is provided on the side wall of the rotating rod (400). When the oil passes through the top opening of the damping hole (105), the oil impacts the inclined blade (404) when passing through, driving the blade (404) to rotate, further driving the driving ring (403) and the rotating rod (400) to rotate, and further driving the threaded strip (401) to rotate synchronously, thereby performing rotational dynamic cleaning on the inner wall of the damping hole (105); the detection mechanism comprises a connecting pipe (200) opened inside the valve body (100), and the connecting pipe (200) is opened at both ends. A port, one end of which is opened on the side wall of the communicating cavity (104) and is located below the valve core (103); the other end of the communicating tube (200) is opened at the top of the communicating cavity (104); a piston block (201) is provided inside the communicating tube (200); the top opening of the communicating tube (200) is connected to a piston rod (203); the piston block (201) and the piston rod (203) are both connected to a spring for resetting; a movable sleeve (300) is fixedly installed inside the valve body (100); the bottom of the piston rod (203) is movably connected to the movable sleeve (300); the bottom of the movable sleeve (300) is movably connected to a driving block (301); a compression spring (302) is provided between the movable sleeve (300) and the driving block (301); a transmission assembly and a rotating assembly are provided inside the movable sleeve (300); The rotating assembly comprises a driving sleeve (500), the top of the rotating rod (400) is connected to the driving sleeve (500), the driving sleeve (500) is sleeved with a driving shaft (505), and the top of the driving shaft (505) is connected to a lifting plate (504); The transmission assembly is used to drive the lifting plates (504) on both sides of the driving sleeve (500) to rise and fall simultaneously, thereby driving the driving sleeve (500) to rotate, and further driving the rotating rod (400) to rotate.

2. The overflow valve with overpressure protection function according to claim 1, characterized in that: The thread strip (401) is designed to be spiral-shaped, and the thread strip (401) is adapted to the inner side wall of the damping hole (105).

3. The overflow valve with overpressure protection function according to claim 1, characterized in that: The transmission assembly includes a clamping block (303) sleeved on the side wall of the driving block (301), a spring is provided between the clamping block (303) and the driving block (301), a rack (306) is provided on the side wall of the driving block (301), a gear set (501) is provided inside the communicating cavity (104), the input end of the gear set (501) is meshed with the rack (306), the transmission shaft of the output gear of the gear set (501) is connected to the camshaft (502), the side wall of the camshaft (502) is connected to the connecting rod (503) through a set of rotating shafts, the lifting plate (504) is connected to the connecting rod (503) through the rotating shaft, a clamping slot (304) is provided inside the movable sleeve (300), and a protection assembly is provided inside the movable sleeve (300) for timely and automatic unloading when the pressure further increases and exceeds the threshold.

4. The overflow valve with overpressure protection function according to claim 3, characterized in that: The bottom of the piston rod (203) is provided with a groove, and the side wall of the clamping block (303) is provided with a chamfered angle that matches the groove at the bottom of the piston rod (203).

5. The overflow valve with overpressure protection function according to claim 3, characterized in that: A cavity (508) and a driving groove (509) are provided inside the driving sleeve (500), a driving shaft (505) is provided at the bottom of the lifting plate (504), a ball bearing (506) is provided on the outer wall of the driving shaft (505), and a sliding groove (507) that cooperates with the ball bearing (506) is provided on the inner wall of the driving groove (509).

6. The overflow valve with overpressure protection function according to claim 5, characterized in that: The radius of the cavity (508) is greater than the sum of the radii of the drive shaft (505) and the ball (506), the number of the chute (507) and the ball (506) is the same, and the bottom opening of the chute (507) is provided with a chamfered corner that is connected to the bottom opening of an adjacent chute (507).

7. The overflow valve with overpressure protection function according to claim 3, characterized in that: The protection component includes a second gear group (600) arranged inside the connecting cavity (104), a second rack (307) is provided on the side wall of the driving block (301), the second rack (307) is meshed with the output end of the second gear group (600), the transmission shaft of the output gear of the second gear group (600) is connected to a reel (601), a pull rope (602) is wound around the side wall of the reel (601), and the other end of the pull rope (602) is connected to the top of the valve core (103).

8. The overflow valve with overpressure protection function according to claim 7, characterized in that: The side wall of the movable sleeve (300) is provided with a second clamping groove (305) corresponding to the clamping block (303), and the spacing between the first clamping groove (304) and the second clamping groove (305) matches the length of the rack (306) in the vertical direction.

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