Closed arc valve

Abstract

The invention relates to the technical field of arc-shaped valves, in particular to a closed arc-shaped valve. According to the technical scheme, the valve comprises a shell and a valve element installed in the shell, and further comprises a valve plate for blocking the valve element, long shafts rotationally connected with the valve plate are fixedly installed on the two sides of the valve element, a transmission force arm is rotationally installed on the shell through an insert bearing, and the transmission force arm is rotationally connected with the long shafts through knuckle bearings; a groove is formed in the valve plate, a force arm located in the groove is fixedly installed on the transmission force arm, and a driving assembly for driving the transmission force arm to rotate is installed on the shell. The bolts only bear the downward pressure of materials on the valve plate, the radial shearing force is small, the bolt loosening situation cannot occur in the production and use process, equipment can stably run for a long time, joint bearing connection is adopted in the interior, the assembly precision of the valve element and the shell can be reduced, and the normal work of the valve is not affected even if the shell slightly deforms in the use process.

Description

Technical Field

[0001] The invention relates to the technical field of arc valves, in particular to a closed arc valve. Background Art

[0002] The closed arc valve is a valve used to control the flow of fluid. Its design feature is that the opening and closing parts of the valve are in an arc-shaped structure. This type of valve is usually used in situations where precise flow control or complete fluid cut-off is required.

[0003] After installation and use, existing valves can be regarded as an integral structure due to upper and lower space limitations. If a problem occurs inside the valve, it cannot be disassembled on site. The valve must be disassembled as a whole for disassembly and maintenance. In actual use, the valve cannot be opened or closed, the valve cannot be completely closed, and other faults occur due to internal problems of the valve, and there is no effective means to find the cause of the fault. The original valve plate and the shaft are connected by bolts, and the bolts are the main stress points when the valve is working. After long-term use, the bolts will become loose, and on-site maintenance cannot be performed after the bolts become loose. The valve plate flip structure is attached to the valve casing, and the valve will fail if the casing is damaged. Summary of the invention

[0004] The purpose of the present invention is to propose a closed arc valve in view of the problems existing in the background technology.

[0005] The technical solution of the present invention: a closed arc valve comprises a housing and a valve core installed inside the housing, and further comprises: A valve plate for sealing the valve core, both sides of the valve core are fixedly installed with long shafts rotatably connected to the valve plate, a transmission force arm is rotatably installed on the outer shell through an outer spherical bearing, the transmission force arm is rotatably connected to the long shaft through a joint bearing, a groove is provided on the valve plate, a force arm located inside the groove is fixedly installed on the transmission force arm, and a driving component for driving the transmission force arm to rotate is installed on the outer shell.

[0006] Optionally, the valve core comprises a fixed body and a lifting body which are slidably connected to each other, and the fixed body and the lifting body are sealed by an elastic sealing strip; An installation groove is arranged on the fixed body, and a receiving plate for bearing the hydraulic pressure in the valve core is slidably installed in the installation groove, and a pressure sealing module for converting the pressure borne by the receiving plate into the downward pressure of the lifting body is installed on the valve core. A partition is slidably installed in the installation groove, and a hydraulic cavity is formed between the partition and the receiving plate. An arc-shaped pressure relief hole is arranged on the receiving plate. A pressure relief module for connecting the pressure relief hole with the hydraulic cavity before the lifting body rises, sealing the pressure relief hole when the valve core is fully opened, and compressing the space in the hydraulic cavity is installed on the valve core.

[0007] Optionally, the receiving plate and the mounting groove are sealed by a flexible sheet, a plurality of springs are fixedly mounted on the partition, and the other ends of the springs are fixedly connected to the partition.

[0008] Optionally, the pressure relief module includes a sealing block rotatably installed in a receiving plate, the sealing block is provided with a connecting hole connected to the pressure relief hole, one end of the connecting hole is provided with an eccentrically arranged flow hole, one end of the sealing block is fixedly installed with a connecting strip, the connecting strip is fixedly installed with a transmission rod, the transmission rod is fixedly installed with a rotating shaft rotatably connected to the valve core, and the rotating shaft is fixedly installed with an extension rod.

[0009] Optionally, the pressure relief module also includes a first sliding rod rotatably mounted on the extension rod, a first sealing block is fixedly mounted on the first sliding rod, a first transmission cylinder is slidably mounted on the first sealing block, the first transmission cylinder is rotatably connected to the fixed body, a second transmission cylinder is fixedly mounted on the fixed body, both ends of the first transmission cylinder and the second transmission cylinder are connected through a first pipe, the first transmission cylinder and the second transmission cylinder and the first pipe are all filled with hydraulic medium, a second sealing block is slidably mounted in the second transmission cylinder, a second sliding rod is fixedly mounted on the second sealing block, a pressure-bearing rod is slidably mounted on the lifting body, a guide rod is fixedly mounted on the pressure-bearing rod, a guide groove is provided on the fixed body, and the guide rod is slidably connected to the guide groove.

[0010] Optionally, the pressure sealing module includes a column slidably mounted on a fixed body and fixedly connected to a receiving plate, a first column is fixedly mounted on both ends of the column, a first sealing head is fixedly mounted on the first column, a first cylinder is slidably mounted on the first sealing head, the first cylinder is fixedly connected to the fixed body, a second cylinder is fixedly mounted on the fixed body, a second sealing head is slidably mounted in the second cylinder, a second column is fixedly mounted on the second sealing head, the second column is fixedly connected to the lifting body, both ends of the first column and the second column are connected through a delivery pipe, and the first column and the second column as well as the delivery pipe are filled with hydraulic medium.

[0011] Optionally, a pressure reducing module is installed on the valve core, and the pressure reducing module increases the gap between the valve plate and the bottom of the lifting body when the valve plate moves.

[0012] Optionally, the pressure reducing module includes a first oil barrel fixedly mounted on the valve plate, a first blocking block being slidably mounted in the first oil barrel, a first round rod being fixedly mounted on the first blocking block, the first round rod being slidably connected to the valve plate and located inside the groove, a second oil barrel being fixedly mounted on the fixed body, a second blocking block being slidably mounted in the second oil barrel, a second round rod being fixedly mounted on the second blocking block, a limiting block being fixedly mounted on the lifting body, the second round rod being slidably connected to the limiting block and a limiting ring being fixedly mounted, a gap being left between the limiting block and the limiting ring, a supporting plate being fixedly mounted on the limiting ring, a sliding groove being provided on the supporting plate, the pressure bearing rod being slidably mounted inside the sliding groove, both ends of the first oil barrel and the second oil barrel are connected by an oil pipe, and the first oil barrel and the second oil barrel and the oil pipe are all filled with hydraulic medium.

[0013] Optionally, connecting plates are fixedly installed at both ends of the valve plate, the connecting plates are rotatably connected to the long axis, a driving plate is fixedly installed on the connecting plate, the groove is located inside the driving plate, an outer arm is fixedly installed on the transmission arm, a cylinder is rotatably installed on the outer shell, and the output shaft of the cylinder is rotatably connected to the outer arm.

[0014] Optionally, the shell includes an upper shell and a lower shell, and the connection between the upper shell and the lower shell is inclined and fixedly connected by a bevel flange.

[0015] In summary, the present application includes at least the following beneficial technical effects: The bolts in this arc valve only bear the downward pressure of the material on the valve plate, and the radial shear force is very small. The bolts will not loosen during production and use, and the equipment can operate stably for a long time. The internal joint bearing connection can reduce the assembly accuracy of the valve core and the shell. Slight deformation of the shell during use will not affect the normal operation of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a closed arc valve; Figure 2 is a schematic diagram of the structure of the shell; Figure 3 Schematic diagram of the structure inside the shell Figure 1 ; Figure 4 Schematic diagram of the structure inside the shell Figure 2 ; Figure 5 It is a schematic diagram of the inner section of the valve core; Figure 6 for Figure 5 A partial enlarged view of the middle A; Figure 7 is a structural schematic diagram of the connecting plate; Figure 8 It is a structural schematic diagram of the valve core; Fig. 9 is a schematic diagram of the structure of the installation slot; Fig.10 is a schematic diagram of the position of the groove and the lever arm; Fig.11 It is a structural schematic diagram of the decompression module; Fig.12 It is a structural schematic diagram of the pressure sealing module; Fig.13 is a schematic diagram of the structure of the partition; Fig.14 The structure of the pressure relief module is shown in Figure 1. Figure 1 ; Fig.15 The structure of the pressure relief module is shown in Figure 1. Figure 2 ; Fig.16 The structure of the pressure relief module is shown in Figure 1. Figure 3 ; Fig.17 for Figure 3 A partial enlarged view of point B in the middle.

[0017] Figure numerals: 1, shell; 101, upper shell; 102, lower shell; 2, valve core; 201, fixed body; 202, lifting body; 203, sealing strip; 3, valve plate; 301, connecting plate; 302, long axis; 303, outer spherical bearing; 304, transmission arm; 305, joint bearing; 306, driving plate; 307, groove; 308, force arm; 309, outer arm; 310, cylinder; 4, mounting groove; 401, receiving plate; 402, flexible sheet; 403, partition; 404, hydraulic chamber; 405, spring; 406, pressure relief hole; 407, blocking block; 408, connecting hole; 409, flow hole; 410, connecting strip; 411, transmission rod; 412, rotating shaft; 413, extension rod; 414, 4. First slide bar; 415. First sealing block; 416. First transmission cylinder; 417. Second transmission cylinder; 418. Second sealing block; 419. Second slide bar; 420. First pipeline; 421. Pressure-bearing rod; 422. Guide rod; 423. Guide groove; 5. Cylinder; 501. First cylinder; 502. First sealing head; 503. First cylinder; 504. Second cylinder; 505. Second sealing head; 506. Second cylinder; 507. Delivery pipe; 6. First oil drum; 601. First blocking block; 602. First round rod; 603. Second oil drum; 604. Second blocking block; 605. Second round rod; 606. Limit block; 607. Limit ring; 608. Support plate; 609. Slide groove; 610. Oil pipe. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Embodiment 1, as Figure 1 , Figure 2 as well as Figures 5 to 7 As shown, the closed arc valve proposed by the present invention includes a housing 1 and a valve core 2 installed inside the housing 1, and also includes a valve plate 3 for blocking the valve core 2. Long shafts 302 rotatably connected to the valve plate 3 are fixedly installed on both sides of the valve core 2. A transmission arm 304 is rotatably installed on the housing 1 through an outer spherical bearing 303. The transmission arm 304 is rotatably connected to the long shaft 302 through a joint bearing 305. A groove 307 is provided on the valve plate 3. A force arm 308 located inside the groove 307 is fixedly installed on the transmission arm 304. The bolts of this structure only bear the downward pressure of the material on the valve plate 3, and the radial shear force is very small. There will be no loosening of the bolts during production and use, and the equipment can operate stably for a long time. The joint bearing 305 is used for internal connection, which can reduce the assembly accuracy of the valve core 2 and the housing 1. The slight deformation of the housing 1 during use does not affect the normal operation of the valve.

[0020] The housing 1 is provided with a driving assembly for driving the transmission arm 304 to rotate. The transmission arm 304 is fixedly provided with an outer arm 309, and the housing 1 is rotatably provided with a cylinder 310, and the output shaft of the cylinder 310 is rotatably connected with the outer arm 309. Both ends of the valve plate 3 are fixedly provided with connecting plates 301, and the connecting plates 301 are rotatably connected with the long shaft 302. The connecting plates 301 are fixedly provided with a driving plate 306, and the groove 307 is located inside the driving plate 306. When the valve is working, the cylinder 310 pushes the outer arm 309 to drive the power arm 308 to drive the valve plate 3 to rotate through the groove 307 and the driving plate 306 to realize the opening and closing of the valve.

[0021] The housing 1 includes an upper housing 101 and a lower housing 102, and the connection between the upper housing 101 and the lower housing 102 is inclined and fixedly connected by an inclined flange. In the actual application of the valve, the upper and lower mounting surfaces of the valve are usually fixed after installation. When the valve is maintained or replaced later, it is difficult to disassemble the valve due to factors such as uneven mounting surfaces. The valve is divided into two parts in a wedge shape, and only a small force is needed to loosen the lower half and easily remove it.

[0022] Embodiment 2, as Figure 3 to Figure 4 and Figure 8-9 as well as Figures 12 to 15As shown, based on the first embodiment, the valve core 2 includes a fixed body 201 and a lifting body 202 which are slidably connected to each other, the fixed body 201 is fixedly connected to the outer shell, the lifting body 202 is slidably connected to the outer shell 1, and the fixed body 201 and the lifting body 202 are sealed by an elastic sealing strip 203. Through the setting of the sealing strip 203, the fixed body 201 and the lifting body 202 can be sealed and the lifting body 202 can be lifted and lowered within a certain range.

[0023] The arc valve of this embodiment also includes a mounting groove 4 arranged on the fixed body 201, and a receiving plate 401 that withstands the hydraulic pressure in the valve core 2 is slidably installed in the mounting groove 4. Under the action of the hydraulic pressure, the hydraulic pressure will apply pressure to the receiving plate 401 and drive the receiving plate 401 to move inside the mounting groove 4, and the pressure borne by the receiving plate 401 depends on the height of the liquid level and the area of ​​the receiving plate 401. A compression sealing module that converts the pressure borne by the receiving plate 401 into the downward pressure of the lifting body 202 is installed on the valve core 2. Under the action of the compression sealing module, the greater the hydraulic pressure inside the valve core 2, the greater the pressure applied by the lifting body 202 to the valve plate 3, thereby ensuring the sealing between the valve plate 3 and the valve core 2, and a sealing strip can be installed on the contact surface between the lifting body 202 and the valve plate 3, and the sealing effect can be further improved by the deformation of the sealing strip. The receiving plate 401 and the mounting groove 4 are sealed by a flexible sheet 402, and the flexible sheet 402 can maintain a high sealing between the mounting groove 4 and the receiving plate 401.

[0024] Furthermore, the pressure sealing module includes a column 5 slidably mounted on the fixed body 201 and fixedly connected to the receiving plate 401, a first column 501 is fixedly mounted on both ends of the column 5, a first sealing head 502 is fixedly mounted on the first column 501, a first cylinder 503 is slidably mounted on the first sealing head 502, the first cylinder 503 is fixedly connected to the fixed body 201, a second cylinder 504 is fixedly mounted on the fixed body 201, a second sealing head 505 is slidably mounted in the second cylinder 504, a second column 506 is fixedly mounted on the second sealing head 505, the second column 506 is fixedly connected to the lifting body 202, both ends of the first column 501 and the second column 506 are connected through a delivery pipe 507, and the first column 501 and the second column The body 506 and the delivery pipe 507 are filled with hydraulic medium. When the hydraulic pressure inside the valve core 2 acts on the receiving plate 401, pressure will be applied to the receiving plate 401. At this time, the pressure on the receiving plate 401 will act on the first column 501, thereby squeezing the hydraulic medium inside the first column 501. It should be noted that the hydraulic medium is a liquid that cannot be compressed in the working environment. At this time, under the transmission action of the delivery pipe 507, the pressure inside the first column 501 will be transmitted to the inside of the second cylinder 504 and applied to the second column 506, thereby enabling the second column 506 to drive the lifting body 202 to apply downward pressure to the valve plate 3, thereby enhancing the sealing between the valve plate 3 and the valve core 2.

[0025] It is worth noting that the pressure ratio on the first column 501 and the second column 506 can be adjusted by adjusting the inner diameter ratio of the first cylinder 503 and the second cylinder 504. The pressure applied by the internal hydraulic pressure of the valve core 2 to the receiving plate 401 can be increased or decreased, and can be designed according to actual needs.

[0026] It should be noted that the sealing performance of the valve plate 3 is a key part in the valve design, and sealing is usually achieved through the following methods: Soft seal uses elastic materials (such as rubber, polytetrafluoroethylene, polyurethane, etc.) as the sealing surface. When the valve is closed, the elastic material between the valve plate 3 and the lifting body 202 deforms and fills the small gap to achieve sealing. However, the elastic material may not be resistant to high temperature or corrosive media, and will wear out during reciprocating movement, and the service life is relatively short.

[0027] Metal seal uses metal materials (such as stainless steel, hard alloy, etc.) as the sealing surface. Through precision machining, the metal surfaces of the valve plate 3 and the lifting body 202 are closely fitted, and the seal is achieved by relying on the hardness and surface finish of the metal. This kind of seal requires high machining accuracy, and the sealing performance is not as good as the soft seal, and a larger closing force is required.

[0028] In summary, in order to ensure the sealing performance and prevent wear on the sealing part, and avoid the need to use greater force when closing, the gap between the lifting body 202 and the valve plate 3 can be increased when the valve plate 3 moves, and after the valve plate 3 is adjusted, the lifting body 202 is combined with the valve plate 3 again, which requires the lifting body 202 to rise, and the rise of the lifting body 202 needs to overcome the pressure exerted by the hydraulic pressure inside the valve core 2 on the receiving plate 401, which is also not conducive to labor-saving operation.

[0029] like Figures 8 to 10 as well as Figures 13 to 17 As shown, in the present embodiment, in order to overcome the above-mentioned problem, a partition 403 is slidably installed in the installation groove 4, a plurality of springs 405 are fixedly installed on the partition 403, and the other end of the spring 405 is fixedly connected to the partition 403, a hydraulic chamber 404 is formed between the partition 403 and the receiving plate 401, an arc-shaped pressure relief hole 406 is provided on the receiving plate 401, and a pressure relief module is installed on the valve core 2, which connects the pressure relief hole 406 with the hydraulic chamber 404 before the lifting body 202 rises, blocks the pressure relief hole 406 when the valve core 2 is fully opened, and compresses the space in the hydraulic chamber 404. When the pressure relief hole 406 is not blocked, the hydraulic chamber 404 and the space inside the valve core 2 will be connected. At this time, the liquid inside the valve core 2 will enter the hydraulic chamber 404. At this time, the forces on both sides of the receiving plate 401 are equal, which is convenient for the receiving plate 401 to move. At this time, the receiving plate 401 does not need to overcome the hydraulic pressure inside the valve core 2, and when the lifting body 202 is lifted, the receiving plate 401 will move toward the inside of the valve core 2 through the transmission of the pressure sealing module. Therefore, the pressure relief module can effectively avoid the problem that the lifting body 202 will encounter greater resistance when it rises. It is worth noting that when the valve plate 3 moves to one side of the valve core 2, the hydraulic pressure inside the valve core 2 will flow out through the bottom of the valve core 2, and the pressure on the receiving plate 401 will decrease. This is because: when the liquid is stationary and not flowing, the pressure of the liquid on the inner wall of the pipe is completely determined by the static pressure, and the pressure distribution gradually increases from top to bottom. When the opening is large and the liquid flows out smoothly, according to Bernoulli's principle, the increase in flow rate will cause the static pressure to decrease, and even if the liquid level remains unchanged, the pressure of the liquid on the inner wall of the pipe will also decrease. At this time, under the action of the spring 405, the partition 403 will be squeezed to fit on the receiving plate 401, and the liquid inside the hydraulic chamber 404 can be discharged at this time, and then the pressure relief hole 406 can be blocked again.

[0030] Further, the pressure relief module includes a blocking block 407 rotatably mounted in the receiving plate 401, a connecting hole 408 communicating with the pressure relief hole 406 is provided in the blocking block 407, an eccentrically arranged flow hole 409 is provided at one end of the connecting hole 408, when the flow hole 409 corresponds to the arc-shaped pressure relief hole 406, the hydraulic chamber 404 and the inside of the valve core 2 will be connected, a connecting strip 410 is fixedly mounted at one end of the blocking block 407, a transmission rod 411 is fixedly mounted on the connecting strip 410, a rotating shaft 412 rotatably connected to the valve core 2 is fixedly mounted on the transmission rod 411, and an extension rod 413 is fixedly mounted on the rotating shaft 412. When the extension rod 413 rotates, the rotating shaft 412 and the flow hole 409 can be driven to rotate, and the rotating flow hole 409 will move along the pressure relief hole 406, and when the flow hole 409 is misaligned with the pressure relief hole 406, the hydraulic chamber 404 and the valve core 2 will not be connected.

[0031] Furthermore, the pressure relief module also includes a first sliding rod 414 rotatably mounted on the extension rod 413, a first sealing block 415 is fixedly mounted on the first sliding rod 414, a first transmission cylinder 416 is slidably mounted on the first sealing block 415, the first transmission cylinder 416 is rotatably connected to the fixed body 201, a second transmission cylinder 417 is fixedly mounted on the fixed body 201, both ends of the first transmission cylinder 416 and the second transmission cylinder 417 are connected through a first pipe 420, the first transmission cylinder 416, the second transmission cylinder 417 and the first pipe 420 are filled with hydraulic medium, a second sealing block 418 is slidably mounted in the second transmission cylinder 417, a second sliding rod 419 is fixedly mounted on the second sealing block 418, a pressure-bearing rod 421 is slidably mounted on the lifting body 202, a guide rod 422 is fixedly mounted on the pressure-bearing rod 421, a guide groove 423 is provided on the fixed body 201, and the guide rod 422 is slidably connected to the guide groove 423. The rising lifting body 202 will drive the pressure-bearing rod 421 to rise, so that the pressure-bearing rod 421 drives the second sliding rod 419 to rise. The rising second sliding rod 419 will squeeze the hydraulic medium inside the second transmission cylinder 417, and through the transmission of the first pipeline 420, it can drive the first sliding rod 414 to move, and then push the extension rod 413 to rotate.

[0032] Due to the setting of the guide groove 423, when the pressure rod 421 moves to a certain height, the pressure rod 421 and the second slide bar 419 are misaligned. At this time, the second slide bar 419 will be reset under the action of gravity, and the flow hole 409 can be quickly blocked.

[0033] like Figure 3 to Figure 4 as well as Fig.11As shown, in this embodiment, a pressure reducing module is installed on the valve core 2, and when the valve plate 3 moves, the pressure reducing module increases the gap between the valve plate 3 and the bottom of the lifting body 202. By increasing the gap between the valve plate 3 and the bottom of the lifting body 202, the friction between the valve plate 3 and the lifting body 202 can be effectively reduced, and the sealing structure on the valve plate 3 can be effectively prevented from being worn, and the valve plate 3 can be easily opened and closed.

[0034] Further, the pressure reducing module includes a first oil barrel 6 fixedly mounted on the valve plate 3, a first block 601 is slidably mounted in the first oil barrel 6, a first round rod 602 is fixedly mounted on the first block 601, the first round rod 602 is slidably connected to the valve plate 3 and is located inside the groove 307, a second oil barrel 603 is fixedly mounted on the fixed body 201, a second block 604 is slidably mounted in the second oil barrel 603, a second round rod 605 is fixedly mounted on the second block 604, and a lifting and lowering module 201 is provided. A limit block 606 is fixedly installed on the body 202, the second round rod 605 is slidably connected to the limit block 606 and fixedly installed with a limit ring 607, a support plate 608 is fixedly installed on the limit ring 607, the support plate 608 is provided with a slide groove 609, the pressure rod 421 is slidably installed inside the slide groove 609, both ends of the first oil barrel 6 and the second oil barrel 603 are connected by an oil pipe 610, and the first oil barrel 6, the second oil barrel 603 and the oil pipe 610 are all filled with hydraulic medium. When the force arm 308 rotates inside the groove 307, it will first squeeze the first round rod 602. At this time, the squeezed first round rod 602 will squeeze the hydraulic medium inside the first oil barrel 6 through the first blocking block 601, and the delivery of the hydraulic medium through the oil pipe 610 can drive the second round rod 605 to rise. When the limit block 606 and the limit ring 607 are in contact, the second round rod 605 that continues to rise will drive the lifting body 202 to rise. Then, after the first round rod 602 moves to the extreme position, the force arm 308 that continues to rotate will drive the valve plate 3 to move. At this time, a certain gap is maintained between the valve plate 3 and the lifting body 202. Therefore, the resistance of the valve plate 3 during movement can be effectively reduced and the wear of the seal on the valve plate 3 can be avoided, which can effectively improve the service life of the valve plate 3.

[0035] It is worth noting that there is a gap between the limit block 606 and the limit ring 607. Through the setting of the gap, the rising limit ring 607 can first circulate the flow hole 409 to reduce the resistance of the lifting body 202 when it rises, and then drive the lifting body 202 to rise.

[0036] The working principle of this embodiment is that when the force arm 308 rotates inside the groove 307, it will first squeeze the first round rod 602, which can drive the second round rod 605 to rise, and will drive the pressure-bearing rod 421 to rise, so that the pressure-bearing rod 421 drives the second sliding rod 419 to rise, and the rising second sliding rod 419 will allow the flow hole 409 to circulate, so as to reduce the resistance of the lifting body 202 when it rises, and then drive the lifting body 202 to rise. When the limit block 606 and the limit ring 607 contact, the second round rod 605 that continues to rise will drive the lifting body 202 to rise, and then after the first round rod 602 moves to the extreme position, the force arm 308 that continues to rotate will drive the valve plate 3 to move. At this time, a certain gap is maintained between the valve plate 3 and the lifting body 202, so that the resistance of the valve plate 3 when moving can be effectively reduced and the wear of the sealing components on the valve plate 3 can be avoided, and the service life of the valve plate 3 can be effectively improved.

[0037] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A closed arc valve, comprising a housing (1) and a valve core (2) installed inside the housing (1), characterized in that: Also includes: A valve plate (3) for sealing the valve core (2), wherein long shafts (302) rotatably connected to the valve plate (3) are fixedly mounted on both sides of the valve core (2), a transmission force arm (304) is rotatably mounted on the housing (1) via an outer spherical bearing (303), the transmission force arm (304) is rotatably connected to the long shaft (302) via a joint bearing (305), a groove (307) is provided on the valve plate (3), a force arm (308) located inside the groove (307) is fixedly mounted on the transmission force arm (304), and a driving component for driving the transmission force arm (304) to rotate is mounted on the housing (1).

2. The closed arc valve according to claim 1, characterized in that: The valve core (2) comprises a fixed body (201) and a lifting body (202) which are slidably connected to each other, and the fixed body (201) and the lifting body (202) are sealed by an elastic sealing strip (203); A mounting groove (4) is provided on a fixed body (201), a receiving plate (401) is slidably mounted in the mounting groove (4) for bearing the hydraulic pressure in the valve core (2), a pressure sealing module is mounted on the valve core (2) for converting the pressure borne by the receiving plate (401) into the downward pressure of the lifting body (202), a partition plate (403) is slidably mounted in the mounting groove (4), a hydraulic chamber (404) is formed between the partition plate (403) and the receiving plate (401), an arc-shaped pressure relief hole (406) is provided on the receiving plate (401), and a pressure relief module is mounted on the valve core (2) for connecting the pressure relief hole (406) with the hydraulic chamber (404) before the lifting body (202) rises, and for sealing the pressure relief hole (406) when the valve core (2) is fully opened, thereby compressing the space in the hydraulic chamber (404).

3. The closed arc valve according to claim 2, characterized in that: The receiving plate (401) and the mounting groove (4) are sealed via a flexible sheet (402); a plurality of springs (405) are fixedly mounted on the partition (403); and the other ends of the springs (405) are fixedly connected to the partition (403).

4. The closed arc valve according to claim 2, characterized in that: The pressure relief module comprises a blocking block (407) rotatably mounted in a receiving plate (401); a connecting hole (408) communicating with the pressure relief hole (406) is provided in the blocking block (407); an eccentrically arranged flow hole (409) is provided at one end of the connecting hole (408); a connecting strip (410) is fixedly mounted at one end of the blocking block (407); a transmission rod (411) is fixedly mounted on the connecting strip (410); a rotating shaft (412) rotatably connected to the valve core (2) is fixedly mounted on the transmission rod (411); and an extension rod (413) is fixedly mounted on the rotating shaft (412).

5. The closed arc valve according to claim 4, characterized in that: The pressure relief module further comprises a first sliding rod (414) rotatably mounted on the extension rod (413); a first sealing block (415) is fixedly mounted on the first sliding rod (414); a first transmission cylinder (416) is slidably mounted on the first sealing block (415); the first transmission cylinder (416) is rotatably connected to the fixed body (201); a second transmission cylinder (417) is fixedly mounted on the fixed body (201); both ends of the first transmission cylinder (416) and the second transmission cylinder (417) are connected via a first pipe (420); The cylinder (416), the second transmission cylinder (417) and the first pipeline (420) are all filled with hydraulic medium, a second sealing block (418) is slidably installed in the second transmission cylinder (417), a second sliding rod (419) is fixedly installed on the second sealing block (418), a pressure-bearing rod (421) is slidably installed on the lifting body (202), a guide rod (422) is fixedly installed on the pressure-bearing rod (421), a guide groove (423) is provided on the fixed body (201), and the guide rod (422) is slidably connected to the guide groove (423).

6. The closed arc valve according to claim 5, characterized in that: The compression sealing module comprises a column (5) slidably mounted on a fixed body (201) and fixedly connected to a receiving plate (401), a first column (501) being fixedly mounted on both ends of the column (5), a first sealing head (502) being fixedly mounted on the first column (501), a first cylinder (503) being slidably mounted on the first sealing head (502), the first cylinder (503) being fixedly connected to the fixed body (201), and a second cylinder (503) being fixedly mounted on the fixed body (201). The first cylinder (501) and the second cylinder (504) are provided with a second sealing head (505) which is slidably mounted inside the second cylinder (504); the second sealing head (505) is provided with a second column (506) which is fixedly mounted on the second sealing head (505); the second column (506) is fixedly connected to the lifting body (202); both ends of the first column (501) and the second column (506) are connected via a delivery pipe (507); the first column (501), the second column (506) and the delivery pipe (507) are filled with hydraulic medium.

7. The closed arc valve according to claim 2, characterized in that: A pressure reducing module is installed on the valve core (2), and when the valve plate (3) moves, the pressure reducing module increases the gap between the valve plate (3) and the bottom of the lifting body (202).

8. The closed arc valve according to claim 7, characterized in that: The pressure reducing module comprises a first oil barrel (6) fixedly mounted on the valve plate (3), a first blocking block (601) being slidably mounted in the first oil barrel (6), a first round rod (602) being fixedly mounted on the first blocking block (601), the first round rod (602) being slidably connected to the valve plate (3) and being located inside the groove (307), a second oil barrel (603) being fixedly mounted on the fixed body (201), a second blocking block (604) being slidably mounted in the second oil barrel (603), a second round rod (605) being fixedly mounted on the second blocking block (604), and a limiting block (606) being fixedly mounted on the lifting body (202). 06), the second round rod (605) is slidably connected to the limit block (606) and fixedly installed with a limit ring (607), a gap is left between the limit block (606) and the limit ring (607), a support plate (608) is fixedly installed on the limit ring (607), a slide groove (609) is provided on the support plate (608), the pressure rod (421) is slidably installed inside the slide groove (609), both ends of the first oil barrel (6) and the second oil barrel (603) are connected through an oil pipe (610), and the first oil barrel (6) and the second oil barrel (603) and the oil pipe (610) are filled with hydraulic medium.

9. The closed arc valve according to claim 1, characterized in that: A connecting plate (301) is fixedly mounted on both ends of the valve plate (3), the connecting plate (301) is rotatably connected to the long shaft (302), a driving plate (306) is fixedly mounted on the connecting plate (301), the groove (307) is located inside the driving plate (306), an outer arm (309) is fixedly mounted on the transmission arm (304), a cylinder (310) is rotatably mounted on the outer shell (1), and an output shaft of the cylinder (310) is rotatably connected to the outer arm (309).

10. The closed arc valve according to claim 1, characterized in that: The housing (1) comprises an upper housing (101) and a lower housing (102); the connection between the upper housing (101) and the lower housing (102) is arranged at an angle and is fixedly connected via an inclined flange.

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