Overflow valve with overpressure protection function

Abstract

The invention discloses an overflow valve with an overpressure protection function, and belongs to the technical field of overflow valves, the overflow valve comprises a valve body, an oil inlet and an oil outlet are formed in the valve body, a communication cavity is formed in the valve body, a valve core is sleeved in the communication cavity, a damping hole is formed in the valve core, and a pressure plug is arranged in the valve body. When the damping hole is blocked, the driving block is driven by the up-down pressure difference of the valve element to extend out at a constant speed, the rotating rod and the threaded strip are driven to do multidirectional compound motion such as forward rotation, ascending, descending and reverse rotation in the damping hole, the shearing effect of full-circumferential covering is generated in the damping hole, sediments in the damping hole are cut and refined, and the damping effect is improved. Turbulent flow accelerated conveying is matched, secondary sedimentation is avoided, the efficient dredging effect on the damping hole is achieved, the vertical pressure difference of the valve element is eliminated in time, oil way pressure is responded and unloaded in time through the pilot valve, and damage to a mechanical structure caused by too large pressure is avoided.

Description

Technical Field

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

[0002] The overflow valve is also called a safety valve. As the name implies, the safety valve is a key safety application guarantee for pressure pipelines and pressure vessels. When the system pressure exceeds the specified value, the safety valve opens, discharging a 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 have an accident due to excessive pressure. In the prior art, the pilot-operated overflow valve can deliver hydraulic oil to the pilot valve above the valve block through the damping hole on the valve block, and make corresponding precise unloading of the oil circuit through the perception and adjustment of pressure by the pilot valve.

[0003] However, in the prior art, when overpressure occurs in the pilot-operated overflow valve, it is generally caused by the blockage of the damping flow hole on the valve block. During the long-term cyclic use of hydraulic oil, parts of the machine that are subject to long-term oil circuit impact, especially the sealed joints, are prone to generate debris. These debris are easily accumulated and blocked in the narrow passage such as the damping flow hole during the flow process, resulting in the blockage of 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 and even rupture damage of the machine and pipeline caused by internal overpressure, which has a great potential safety hazard. Summary of the Invention

[0004] To make up for the above deficiencies, the present invention provides an overflow valve with overpressure protection function, aiming to improve the problems raised in the above background art.

[0005] The present invention is implemented as follows:

[0006] The present invention provides an overflow valve with overpressure protection function, including a valve body. A communication cavity is opened inside the valve body. A valve core is sleeved inside the communication cavity. A damping hole is opened inside the valve core. A pressure plug is arranged inside the valve body. A spring is arranged between the pressure plug and the valve body. A detection mechanism and a cleaning mechanism are arranged inside the valve body;

[0007] The cleaning mechanism includes a rotating cylinder sleeved above the damping hole. A driving ring is arranged inside the rotating cylinder. Vanes are connected between the driving ring and the rotating cylinder. A rotating rod is movably sleeved inside the driving ring. A threaded strip is arranged on the side wall of the rotating rod;

[0008] The detection mechanism includes a connecting pipe opened inside the valve body. Both ends of the connecting pipe are open, one end is opened on the side wall of the communicating cavity below the valve core, and the other end of the connecting pipe is opened at the top of the communicating cavity. A piston block is arranged inside the connecting pipe. The top opening of the connecting pipe is connected with a piston rod. Both the piston block and the piston rod are connected with springs for resetting. An activity sleeve is fixedly installed inside the valve body. The bottom of the piston rod is movably sleeved with the activity sleeve. The bottom of the activity sleeve is movably sleeved with a driving block. A compression spring is arranged between the activity sleeve and the driving block. A transmission component and a rotating component are arranged inside the activity sleeve.

[0009] Preferably, the threaded strip is designed in a spiral shape and is adapted to the inner side wall of the damping hole.

[0010] Preferably, the transmission component includes a clamping block sleeved on the side wall of the driving block. A spring is arranged between the clamping block and the driving block. A first rack is arranged on the side wall of the driving block. A first gear set is arranged inside the communicating cavity. The input end of the first gear set is meshed with the first rack. The transmission rotating shaft of the output gear of the first gear set is connected with a camshaft. A connecting rod is connected to the side wall of the camshaft through a set of rotating shafts. The top of the rotating rod is connected with a driving sleeve. The driving sleeve is sleeved with a driving shaft. The top of the driving shaft is connected with a lifting plate. The lifting plate is connected with the connecting rod through a rotating shaft. A first slot is opened inside the activity sleeve. A protection component is arranged inside the activity sleeve.

[0011] Preferably, a groove is arranged at the bottom of the piston rod, and an inverted chamfer is arranged on the side wall of the clamping block to cooperate with the groove at the bottom of the piston rod.

[0012] Preferably, the rotating component includes a cavity and a driving groove opened inside the driving sleeve. A driving shaft is arranged at the bottom of the lifting plate. A ball is arranged on the outer side wall of the driving shaft. A sliding groove matched with the ball is arranged on the inner side wall of the driving groove.

[0013] Preferably, the radius of the cavity is greater than the sum of the radii of the driving shaft and the ball. The number of the sliding grooves and the balls is the same, and an inverted fillet communicating with the bottom opening of the adjacent sliding groove is arranged at the bottom opening of the sliding groove.

[0014] Preferably, the protection component includes a second gear set arranged inside the communicating cavity. A second rack is arranged on the side wall of the driving block. The second rack is meshed with the output end of the second gear set. The transmission rotating shaft of the output gear of the second gear set is connected with a reel. A pull rope is wound around the side wall of the reel. The other end of the pull rope is connected with the top of the valve core.

[0015] Preferably, a second slot corresponding to the clamping block is opened on the side wall of the activity sleeve. The distance between the first slot and the second slot matches the length of the first rack 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 hole, the driving force of the oil passing through the blade drives the threaded bar to rotate, automatically cleaning the damping hole, reducing the impurity deposition when the oil flows through, reducing the risk of damping hole blockage, and ensuring the stability of the valve body operation; when the damping hole is blocked, the driving block is driven to extend uniformly by the pressure difference between the upper and lower parts of the valve core, and further through the cooperation of the driving shaft and the driving sleeve, the rotating rod and the threaded bar are driven to perform multi-directional compound movements such as forward rotation, upward movement, downward movement and reverse rotation inside the damping hole, generating a circumferentially covering shearing effect inside the damping hole, cutting and refining the deposits inside the damping hole, and cooperating with the turbulent flow to accelerate the transportation to avoid secondary precipitation, 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 the pilot valve timely responds to and unloads the oil circuit pressure 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 an overpressure risk, the piston block and the piston rod are further moved by the pressure difference, driving the driving block to move further downward, making the second rack engage with the second gear set, driving the reel to rotate to wind up the pulling rope, driving the valve core to slowly lift, so that there is a gap 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 beyond the threshold, forced automatic unloading can be achieved to avoid mechanical damage caused by excessive oil circuit pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

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

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

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

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

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

[0025] Figure 6It is a schematic internal view of the driving block provided by an embodiment of the present invention.

[0026] Figure 7 It is a schematic view of the first rack transmission provided by an embodiment of the present invention.

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

[0028] Figure 9 It is a schematic internal structure view of the driving sleeve provided by an embodiment of the present invention.

[0029] Figure 10 It is a schematic view of the second rack 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, communication cavity; 105, damping hole; 106, pressure plug; 200, communication pipe; 201, piston block; 203, piston rod; 300, movable sleeve; 301, driving block; 302, compression spring; 303, clamping block; 304, first card slot; 305, second card slot; 306, first rack; 307, second rack; 400, rotating rod; 401, threaded strip; 402, rotating cylinder; 403, driving ring; 404, blade; 500, driving sleeve; 501, first gear set; 502, camshaft; 503, connecting rod; 504, lifting plate; 505, driving shaft; 506, ball; 507, sliding groove; 508, cavity; 509, driving groove; 600, second gear set; 601, reel; 602, pulling rope. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Refer to Figures 1 - 10, the present invention provides an overflow valve with overvoltage protection function, which includes a valve body 100. An oil inlet 101 and an oil drain port 102 are provided inside the valve body 100. 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, and the communication cavity 104 is divided into upper and lower groups of cavities by the valve core 103. A pressure plug 106 is provided inside the valve body 100, and a spring is provided between the pressure plug 106 and the valve body 100. A detection mechanism and a cleaning mechanism are provided inside the valve body 100;

[0034] The cleaning mechanism includes a rotating cylinder 402 sleeved above the damping hole 105. The rotating cylinder 402 is sleeved with the valve body 100 in a limited and movable manner and can rotate freely at the same time. A driving ring 403 is provided inside the rotating cylinder 402. Blades 404 are connected between the driving ring 403 and the rotating cylinder 402. A rotating rod 400 is movably sleeved inside the driving ring 403. A threaded strip 401 is provided on the side wall of the rotating rod 400;

[0035] The detection mechanism includes a communication pipe 200 provided inside the valve body 100. Both ends of the communication pipe 200 are open. One end is opened on the side wall of the communication cavity 104 below the valve core 103, and the other end of the communication pipe 200 is opened at the top of the communication cavity 104 facing the valve core 103. A piston block 201 is provided inside the communication pipe 200. A piston rod 203 is connected to the top opening of the communication pipe 200. Both the piston block 201 and the piston rod 203 are connected with springs for resetting. An activity sleeve 300 is fixedly installed inside the valve body 100. The bottom of the piston rod 203 is movably sleeved with the activity sleeve 300. A driving block 301 is movably sleeved at the bottom of the activity sleeve 300. A compression spring 302 is provided between the activity sleeve 300 and the driving block 301. A transmission component and a rotating component are provided inside the activity sleeve 300.

[0036] Furthermore, the threaded strip 401 is designed in a spiral shape and is adapted to the inner side wall of the damping hole 105.

[0037] Refer to Figures 2 - 9, the transmission assembly includes a clamping block 303 sleeved on the side wall of the driving block 301. A spring is arranged between the clamping block 303 and the driving block 301. A first rack 306 is arranged on the side wall of the driving block 301. A first gear set 501 is arranged inside the communication cavity 104. The input end of the first gear set 501 meshes with the first rack 306. The transmission rotating shaft of the output gear of the first gear set 501 is connected with a camshaft 502. A connecting rod 503 is connected to the side wall of the camshaft 502 through a set of rotating shafts. It should be noted that the first gear set 501 is composed of multiple sets of small meshing gear sets. The input end is a set of gears close to the first rack 306 and meshing with the first rack 306, while the output end is a set of gears on the side far from the first rack 306. The top of the rotating rod 400 is connected with a driving sleeve 500. The driving sleeve 500 is sleeved with a driving shaft 505. The top of the driving shaft 505 is connected with a lifting plate 504. The lifting plate 504 is connected with the connecting rod 503 through a rotating shaft. A first clamping groove 304 is formed inside the movable sleeve 300. A protection assembly is arranged inside the movable sleeve 300. There are two sets of transmission assemblies, which are specifically designed symmetrically with the axis of the driving sleeve 500 as the reference, and are used to drive the lifting plate 504 to lift on both sides of the driving sleeve 500, thereby driving the driving sleeve 500 to rotate.

[0038] Further, a groove is arranged at the bottom of the piston rod 203, and an inverted chamfer is formed on the side wall of the clamping block 303 to cooperate with the groove at the bottom of the piston rod 203.

[0039] Refer to Figure 9 , the rotating assembly includes a cavity 508 and a driving groove 509 formed inside the driving sleeve 500. A driving shaft 505 is arranged at the bottom of the lifting plate 504. A ball 506 is arranged on the outer side wall of the driving shaft 505. A sliding groove 507 is formed on the inner side wall of the driving groove 509 to cooperate with the ball 506.

[0040] It should be noted that the radius of the cavity 508 is greater than the sum of the radii of the driving shaft 505 and the ball 506. The number of the sliding grooves 507 and the balls 506 is the same, and an inverted fillet communicating with the bottom opening of the adjacent sliding groove 507 is formed at the bottom opening of the sliding groove 507. Specifically, the inverted fillets at the bottom openings of the sliding grooves 507 communicate with each other. Therefore, when the lifting plate 504 drives the driving shaft 505 to rise, due to the same distribution quantity and angle of the balls 506 and the sliding grooves 507, during the rising process of the driving shaft 505 and the balls 506, the balls 506 can slide into the inside of the sliding groove 507 through the inverted fillet at the bottom opening of the sliding groove 507, realizing the rapid positioning of the balls 506. Moreover, since the inverted fillets communicate with each other, the bottoms of the sliding grooves 507 are all designed as arc surfaces, avoiding jamming caused by the difficulty of the balls 506 to move when encountering a plane during the rising process;

[0041] Meanwhile, due to the relatively large inner diameter of the cavity 508, when the lifting plate 504 is stationary and does not rise, when the rotating rod 400 rotates, relative sliding treatment is performed at the connection between the driving sleeve 500 and the driving shaft 505. 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 driving shaft 505 moves in the vertical direction will it drive the driving sleeve 500 to rotate.

[0042] Referring to Figures 2 - 10 , the protection component includes a second gear set 600 arranged inside the communication cavity 104. A second rack 307 is provided on the side wall of the driving block 301. The second rack 307 meshes with the output end of the second gear set 600. The transmission rotating shaft of the output gear of the second gear set 600 is connected with a reel 601. A pull rope 602 is wound 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 second gear set 600 is composed of multiple sets of small meshing gear sets. The input end is a set of gears close to and meshing with the second rack 307, and the output end is a set of gears on the side far from the second rack 307.

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

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

[0045] The oil fluid enters the communication cavity 104 through the oil inlet 101, and further enters above the valve core 103 through the damping hole 105. If the pressure is too high, dynamic balance adjustment can be carried out by opening the pilot valve or the main valve to relieve pressure. During this process, when the oil fluid passes through the top opening of the damping hole 105, the oil fluid impacts the inclined designed blade 404 when passing through, which can provide a tangential force for the blade 404, driving the blade 404 to rotate, further driving the driving 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, perform rotational dynamic cleaning on the inner side wall of the damping hole 105, realizing automatic cleaning without external force. Moreover, through the spiral design of the threaded bar 401, axial cleaning is performed on the inner side wall, peeling off the attached impurities and sediments. At the same time, a centrifugal rotation effect is generated by the rotation of the threaded bar 401, driving the impurities to pass through, realizing radial cleaning, avoiding the re-deposition of impurities, and realizing that during normal operation, the driving force of the oil fluid on the blade 404 when passing through drives the threaded bar 401 to rotate, automatically cleaning the damping hole 105, reducing the impurity deposition when the oil fluid flows through, reducing the blockage of the damping hole 105, and ensuring the stable operation of the valve body 100.

[0046] When the long-term operation of the valve body 100 causes the accumulation of metal debris in the oil fluid, resulting in the gradual blockage of the damping hole 105, when the oil fluid 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 upper part of the valve core 103 slowly through the flow of the oil fluid, 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 in the connecting pipe 200 from the lower opening of the valve core 103 towards the upper opening of the valve core 103. During this process, multiple groups of piston blocks 201 and piston rods 203 and the springs connected to them play the role of overcoming the pressure below the valve core 103. When the piston rod 203 moves, the piston rod 203 pushes the driving block 301 to move downward towards the valve core 103 by compressing the spring 302. When the locking block 303 passes through the first slot 304, under the action of the elastic force of the spring connected to the locking block 303, the locking block 303 extends and engages with the first slot 304. When the piston rod 203 continues to move downward, it will continuously compress and store energy in the spring 302 until the groove at the bottom of the piston rod 203 contacts the inclined surface of the locking block 303. Under the pushing action of the groove, the locking block 303 moves into the driving block 301 and disengages from the engagement with the first slot 304. The driving block 301 disengaged from the locking block 303 moves uniformly away from the piston rod 203 under the elastic force of the spring 302. When the driving block 301 extends, the first rack 306 on the side wall of the driving block 301 can drive the camshaft 502 to rotate through the first gear set 501. When the camshaft 502 rotates, through the corresponding movement of two groups of camshafts 502 and their corresponding cams, it drives 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 quickly locates and enters the sliding groove 507 through the rounded corner at the bottom of the sliding groove 507, and drives the driving sleeve 500 to rotate through the sliding groove 507, thereby driving the rotating rod 400 to rotate, and then driving the threaded bar 401 to rotate actively. When the driving shaft 505 moves to the highest position inside the driving groove 509 and the lifting plate 504 continues to rise, it can also drive the driving sleeve 500 and the rotating rod 400 to move a small distance in the vertical direction. When the lifting plate 504 descends, the driving sleeve 500 and the rotating rod 400 first synchronously descend a certain distance along the vertical direction with the driving shaft 505. Further, when the driving shaft 505 descends and leaves the area of the driving groove 509, it can drive the rotating rod 400 to rotate in the reverse direction through the cooperation of the ball 506 and the sliding groove 507, so that the threaded bar 401 makes a multi-directional composite movement inside the damping hole 105. Through the bidirectional spiral rotation of the threaded bar 401, it impacts the inner side wall of the damping hole 105. Compared with the unidirectional rotation, the sediment is prone to unilateral stress concentration and is only easily pushed away rather than broken and dredged. The bidirectional rotation can alternately apply reverse shear stress, reduce the impurity binding energy, and cooperate with the multi-directional shear superposition in the vertical direction.The shearing effect with full circumferential coverage is beneficial to the crushing of impurities rather than the plastic deformation of unidirectional rotation, thereby improving the damage effect on the adhesion layer. With the alternating forward and reverse rotation and the reciprocating motion in the vertical direction, the 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 impurities after crushing, reduces secondary sedimentation, and accelerates the transportation of impurities when the liquid flows through, improves the dredging effect of siltation and blockage, so that when the oil inlet 101 is over-pressured, the damping hole 105 can be automatically dredged to ensure the flowability of the damping hole 105, improve the stability of the pressure transmission at the upper and lower ends of the valve core 103, and avoid the damage to the device caused by the over-pressure caused by 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 pressure difference between the upper and lower parts of the valve core 103 drives the driving block 301 to accumulate force and extend at a uniform speed, and further drives the rotating rod 400 and the threaded strip 401 to perform multi-directional composite movements such as forward rotation, ascending, descending and reverse rotation inside the damping hole 105 through the cooperation of the driving shaft 505 and the driving sleeve 500, 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, eliminate the pressure difference between the upper and lower parts of the valve core 103 in time, and respond and unload the oil circuit pressure in time 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 groups of pipe grooves. When the piston rod 203 moves down to compress 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 in through the pipe groove to fill the gap between the piston rod 203 and the driving block 301, 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 means 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 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 cooperates with the second card slot 305, the card block 303 will extend out and engage with the second card slot 305 under 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 307 and the gear set 600 mesh with each other to drive the reel 601 to rotate. The pull rope 602 is wound up 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 simultaneously apply tension to the valve core 103, 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 and 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 drive block 301 rises and resets, through the inclined surface design of the card block 303, when the drive block 301 rises and resets, the card block 303 can directly pass through the card slot 2 305 and the card slot 1 304 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 circuit 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 inside of the valve core 103 is compressed.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An overflow valve with overvoltage protection function, comprising a valve body (100), wherein an oil inlet (101) and an oil drain port (102) are provided inside the valve body (100), and it is 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). A detection mechanism and a cleaning mechanism are provided inside the valve body (100). The cleaning mechanism includes a rotating cylinder (402) sleeved above the damping hole (105). A driving ring (403) is provided inside the rotating cylinder (402). Blades (404) are connected between the driving ring (403) and the rotating cylinder (402). A rotating rod (400) is movably sleeved inside the driving ring (403). A threaded bar (401) is provided on the side wall of the rotating rod (400). The detection mechanism includes a communication pipe (200) provided inside the valve body (100). Both ends of the communication pipe (200) are open. One end is opened on the side wall of the communication cavity (104), below the valve core (103). The other end of the communication pipe (200) is opened at the top of the communication cavity (104). A piston block (201) is provided inside the communication pipe (200). The top opening of the communication pipe (200) is connected to a piston rod (203). Springs for resetting are connected to both the piston block (201) and the piston rod (203). A movable sleeve (300) is fixedly installed inside the valve body (100). The bottom of the piston rod (203) is movably sleeved with the movable sleeve (300). A driving block (301) is movably sleeved at the bottom of the movable sleeve (300). 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).

2. The overflow valve with overvoltage protection function according to claim 1, characterized in that, The threaded bar (401) is designed in a spiral shape and is adapted to the inner side wall of the damping hole (105).

3. The overflow valve with overvoltage 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 arranged between the clamping block (303) and the driving block (301). A first rack (306) is arranged on the side wall of the driving block (301). A first gear set (501) is arranged inside the communication cavity (104). The input end of the first gear set (501) meshes with the first rack (306). The transmission rotating shaft of the output gear of the first gear set (501) is connected with a camshaft (502). A connecting rod (503) is connected to the side wall of the camshaft (502) through a set of rotating shafts. The top of the rotating rod (400) is connected with a driving sleeve (500). The driving sleeve (500) is sleeved with a driving shaft (505). The top of the driving shaft (505) is connected with a lifting plate (504). The lifting plate (504) is connected with the connecting rod (503) through a rotating shaft. A first clamping groove (304) is formed inside the movable sleeve (300). A protection assembly is arranged inside the movable sleeve (300).

4. The overflow valve with overvoltage protection function according to claim 3, characterized in that, A groove is formed at the bottom of the piston rod (203). An inverted chamfer is formed on the side wall of the clamping block (303) and is matched with the groove at the bottom of the piston rod (203).

5. An overflow valve with an overvoltage protection function according to claim 3, characterized in that, The rotating assembly includes a cavity (508) and a driving groove (509) formed inside the driving sleeve (500). A driving shaft (505) is arranged at the bottom of the lifting plate (504). A ball (506) is arranged on the outer side wall of the driving shaft (505). A sliding groove (507) matched with the ball (506) is formed on the inner side wall of the driving groove (509).

6. The overflow valve with overvoltage protection function according to claim 5, characterized in that, The radius of the cavity (508) is larger than the sum of the radii of the driving shaft (505) and the ball (506). The number of the sliding grooves (507) is the same as that of the balls (506). An inverted fillet communicating with the bottom opening of the adjacent sliding groove (507) is formed at the bottom opening of the sliding groove (507).

7. The overflow valve with overvoltage protection function according to claim 3, characterized in that, The protection assembly includes a second gear set (600) arranged inside the communication cavity (104). A second rack (307) is arranged on the side wall of the driving block (301). The second rack (307) meshes with the output end of the second gear set (600). The transmission rotating shaft of the output gear of the second gear set (600) is connected with a reel (601). A pull rope (602) is wound around the side wall of the reel (601). The other end of the pull rope (602) is connected with the top of the valve core (103).

8. An overflow valve with an overvoltage protection function according to claim 7, characterized in that, A second clamping groove (305) corresponding to the clamping block (303) is formed on the side wall of the movable sleeve (300). The distance between the first clamping groove (304) and the second clamping groove (305) is matched with the length of the first rack (306) in the vertical direction.

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