High-pressure large-diameter self-closing valve

Abstract

The invention discloses a high-pressure large-diameter self-closing valve, which relates to the technical field of wedge gate valves and comprises a valve body, an end cover is hermetically connected to the middle of the top of the valve body, a control wheel is rotatably connected to the center of the top surface of the end cover, valve ports are fixedly connected to two ends of the valve body, and a wedge self-closing valve core is arranged on the inner side of the valve body. The control wheel is used for controlling the position of the wedge type self-closing valve element, the position, close to the wedge type self-closing valve element, of the inner side of the valve body is fixedly connected with an inclined seat matched with the wedge type self-closing valve element, a control mechanism is arranged on one face of the valve body, the control mechanism controls high-pressure fluid in the valve body, and the pressure of the high-pressure fluid acts on the top face of the wedge type self-closing valve element. The high-pressure fluid in the valve body is controlled through the control mechanism, the high-pressure fluid acting on the top face of the wedge type self-closing valve element is isolated, in this way, the pressure of the high-pressure fluid in the valve body directly acts on the inner side of the wedge type self-closing valve element, and the position of the wedge type self-closing valve element in the valve body is convenient to control.

Description

Technical Field

[0001] The invention relates to the technical field of wedge-type gate valves, and in particular to a high-pressure large-diameter self-closing valve. Background Art

[0002] Wedge gate valves are widely used in petrochemical, thermal power plants and other oil and steam pipelines as opening and closing devices to connect or cut off the medium in the pipeline.

[0003] Existing wedge-type gate valves, such as a wedge-tight gate valve disclosed in Chinese patent application with publication number CN114352758A and a large-diameter wedge-type gate valve disclosed in Chinese patent application with publication number CN113464674A, mainly include a valve body, a regulating box, an opening and closing mechanism and a base. During the process of opening and closing the valve core, the wedge-type gate valve is affected by the reaction force of the high-pressure fluid in the pipeline, that is, during the process of closing the valve core, the high-pressure fluid in the pipeline will act on the inner end of the valve core, making it difficult to close the valve core, and a large external driving force is required to drive the valve core. Summary of the invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a high-pressure large-diameter self-closing valve to solve the problem in the prior art that, during the process of closing the valve core, the high-pressure fluid in the pipeline will act on the inner end of the valve core, requiring a large external driving force to drive the valve core, resulting in difficulty in closing the valve core.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] Specifically, a high-pressure large-caliber self-closing valve is provided, including a valve body, an end cover is sealed and connected to the middle position of the top of the valve body, a control wheel is rotatably connected to the center position of the top surface of the end cover, valve ports are fixedly connected to both ends of the valve body, a wedge-type self-closing valve core is arranged on the inner side of the valve body, the control wheel is used to control the position of the wedge-type self-closing valve core, an inclined seat matching the wedge-type self-closing valve core is fixedly connected to the position of the inner side of the valve body near the wedge-type self-closing valve core, a control mechanism is arranged on one side of the valve body, the control mechanism controls the high-pressure fluid inside the valve body, and the pressure of the high-pressure fluid acts on the top surface of the wedge-type self-closing valve core.

[0007] As a further solution of the present invention: the valve body includes a valve shell, a movable groove is opened on the top of the valve shell, a first control groove and a second control groove are opened at both ends of the valve shell, a high-pressure groove and a low-pressure groove are opened on the top surface of the valve body, a control and adjustment groove is opened on one side of the valve shell, a built-in groove is opened on the bottom surface of the first control groove, and a connecting groove is opened on one side of the first control groove.

[0008] As a further solution of the present invention: a side plate is arranged inside the first control groove, a circular groove is opened at the inner center position of the side plate, a circular plate is arranged in the circular groove, a V-shaped groove is opened at the bottom of the circular plate, a connecting control groove is opened on the bottom surface of the circular groove, a first channel is opened on one side of the circular groove, a second channel is opened on the other side of the circular groove, and the first channel is connected with the control and adjustment groove.

[0009] As a further solution of the present invention: a connecting channel is provided inside the second control groove, one end of the connecting channel is connected to the second channel, and the other end of the connecting channel is connected to the control and adjustment groove.

[0010] As a further solution of the present invention: the control mechanism includes a mechanism shell, the mechanism shell is matched with the control adjustment groove, a movable sealing block is arranged on the inner side of the mechanism shell, and connecting ports are opened on both sides of the mechanism shell, and the connecting ports on both sides are respectively connected with the first channel and the connecting channel, and sealing blocks are slidably connected at both ends of the mechanism shell, and a first groove and a second groove are opened on the inner side of the sealing block.

[0011] As a further solution of the present invention: the wedge-type self-closing valve core includes a valve core body, a sealing slider is fixedly connected to the top surface of the valve core body, a ball nut is installed in the middle position of the top surface of the valve core body, and limiting holes are opened on both sides of the top surface of the valve core body close to the ball nut.

[0012] As a further solution of the present invention: the bottom surface of the end cover is fixedly connected to a limit rod, the control wheel includes a wheel body, the bottom surface of the wheel body is fixedly connected to a threaded rod, and the threaded rod passes through the end cover and cooperates with the ball nut.

[0013] As a further solution of the present invention: a plurality of grooves are provided on the side of the valve core body, and a plurality of protrusions matching the grooves are fixedly connected to the surface of the inclined seat.

[0014] As a further solution of the present invention: the sealing block matches the high-pressure groove and the low-pressure groove.

[0015] As a further solution of the present invention: a rotating shaft is fixedly connected to the inner center position of the circular plate, one end of the rotating shaft is fixedly connected to the first gear, the side of the first gear is meshed with the second gear, one side of the second gear is movably connected to a hydraulic cylinder, a pressure groove is provided on the bottom surface of the end cover, the top ends of the high-pressure groove and the low-pressure groove are connected to the pressure groove, the limit rod is matched with the limit hole on the top surface of the valve core body, so as to ensure the stability of the valve core body during movement, and an arc groove is provided on one side of the end cover, so as to match with the second gear, so as to ensure that the second gear can rotate freely.

[0016] Beneficial effects of the present invention:

[0017] 1. In the present invention, the high-pressure fluid inside the valve body is controlled by a control mechanism, so that the pressure of the high-pressure fluid acts on the top surface of the wedge-type self-closing valve core, so that the pressure on the top surface of the wedge-type self-closing valve core can offset the pressure of the high-pressure fluid inside the valve body, so that the wedge-type self-closing valve core is easy to move toward the inside of the valve body, and the inner cavity of the valve body is sealed, thereby realizing the automatic closing function of the high-pressure large-diameter self-closing valve. It is necessary to provide an additional closing driving force for the wedge-type self-closing valve core to ensure that the high-pressure large-diameter self-closing valve is suitable for water-saving pipelines or water-saving stations. When the pipeline needs to be opened, the high-pressure fluid inside the valve body can also be controlled by the control mechanism to isolate the high-pressure fluid acting on the top surface of the wedge-type self-closing valve core, so that the pressure of the high-pressure fluid inside the valve body directly acts on the inner side of the wedge-type self-closing valve core, so that the wedge-type self-closing valve core is easy to move toward the outside of the valve body, and the position of the wedge-type self-closing valve core inside the valve body is easy to control.

[0018] 2. In the present invention, after the hydraulic cylinder is turned on, the hydraulic cylinder can drive the second gear through the hydraulic rod to rotate the second gear, and the rotating second gear can drive the first gear to rotate, and the rotating first gear can rotate through the rotating shaft, and the rotating rotating shaft will drive the circular plate to rotate the circular plate by a certain angle. When the circular plate rotates by a certain angle, the position of the V-groove will be changed. When the V-groove is in a position connected with the connecting control groove and the first channel and is converted to a position connected with the connecting control groove and the second channel, the second channel will be filled with high-pressure fluid, and vice versa, the first channel will be filled with high-pressure fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a structural schematic diagram of a high-pressure large-caliber self-closing valve of the present invention;

[0021] Figure 2 It is a side view of a high-pressure large-caliber self-closing valve of the present invention;

[0022] Figure 3 This is a front view of a high-pressure large-caliber self-closing valve of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the front side of the valve body in the present invention;

[0024] Figure 5 It is a structural schematic diagram of the back side of the valve body in the present invention;

[0025] Figure 6 It is a structural schematic diagram of the side plate in the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the end cover and the control wheel in the present invention;

[0027] Figure 8 It is a schematic diagram of the structure of the control wheel and the wedge-type self-closing valve core in the present invention;

[0028] Fig. 9 It is a structural schematic diagram of the wedge-type self-closing valve core in the present invention;

[0029] Fig.10 It is a structural schematic diagram of the control mechanism in the present invention;

[0030] Fig.11 It is a schematic diagram of the structure of the circular plate in the present invention;

[0031] Fig.12 It is a structural schematic diagram of the back side of the second gear in the present invention.

[0032] Figure numerals: 1, valve body; 11, valve housing; 12, moving groove; 13, first control groove; 131, side plate; 132, circular groove; 133, circular plate; 134, V-shaped groove; 135, connecting control groove; 136, first channel; 137, second channel; 138, rotating shaft; 139, first gear; 1310, second gear; 1311, hydraulic cylinder; 14, second control groove; 141, connecting channel; 15, high pressure groove; 16, built-in groove; 17, connecting groove; 18, low Pressure groove; 19, control adjustment groove; 2, end cover; 21, arc groove; 22, pressure groove; 23, limit rod; 3, control wheel; 31, wheel body; 32, threaded rod; 4, valve port; 5, wedge-type self-closing valve core; 51, valve core body; 52, sealing slider; 53, ball nut; 54, limit hole; 6, control mechanism; 61, mechanism housing; 62, movable sealing block; 63, connecting port; 64, first groove; 65, second groove; 66, sealing block; 7, inclined seat; 71, cylindrical groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] like Figure 1 - Fig.12As shown, the present invention discloses a high-pressure large-caliber self-closing valve, including a valve body 1. It should be noted that the volume of the valve body 1 is adaptively selected by those skilled in the art according to a specific installation environment. An end cover 2 is sealed and connected to the middle position of the top thereof. A control wheel 3 is rotatably connected to the center position of the top surface of the end cover 2. Valve ports 4 are fixedly connected to both ends of the valve body 1. The valve port 4 is connected to a corresponding pipeline through bolts. A wedge-type self-closing valve core 5 is arranged on the inner side of the valve body 1. The control wheel 3 is used to control the position of the wedge-type self-closing valve core 5. The inner side of the valve body 1 is fixedly connected with an inclined seat 7 that matches the wedge-type self-closing valve core 5, and a cylindrical groove 71 is provided on the side of the inclined seat 7 to communicate with the inner cavity of the valve body 1. A control mechanism 6 is provided on the front of the valve body 1. The control mechanism 6 controls the high-pressure fluid inside the valve body 1 and applies the pressure of the high-pressure fluid to the top surface of the wedge-type self-closing valve core 5. It should be noted that when using the high-pressure large-diameter self-closing valve, the high-pressure large-diameter self-closing valve can be installed at the butt joint of the pipeline. When it is necessary to When the pipeline is closed, the high-pressure fluid inside the valve body 1 can be controlled by the control mechanism 6, so that the pressure of the high-pressure fluid acts on the top surface of the wedge-type self-closing valve core 5, so that the pressure on the top surface of the wedge-type self-closing valve core 5 can offset the pressure of the high-pressure fluid inside the valve body 1, so that the wedge-type self-closing valve core 5 is easy to move to the inside of the valve body 1, and the inner cavity of the valve body 1 is sealed, so as to realize the automatic closing function of the high-pressure large-caliber self-closing valve. It is necessary to provide an additional closing driving force for the wedge-type self-closing valve core 5 to ensure that the high-pressure large-caliber self-closing valve is suitable for water-saving pipelines or water-saving stations, and prevent the water-saving pipelines or water-saving stations from continuing to transport water after completing the transportation task, resulting in waste of water resources. When the pipeline needs to be opened, the high-pressure fluid inside the valve body 1 can also be controlled by the control mechanism 6 to isolate the high-pressure fluid acting on the top surface of the wedge-type self-closing valve core 5, so that the pressure of the high-pressure fluid inside the valve body 1 directly acts on the inner side of the wedge-type self-closing valve core 5, so that the wedge-type self-closing valve core 5 is easy to move to the outside of the valve body 1, and the position of the wedge-type self-closing valve core 5 inside the valve body 1 is easy to control.

[0036] Example 2

[0037] like Figures 1 to 12As shown, the valve body 1 includes a valve housing 11, a movable groove 12 is opened on the top of the valve housing 11, a first control groove 13 and a second control groove 14 are opened at both ends of the valve housing 11, a high-pressure groove 15 and a low-pressure groove 18 are opened on the top surface of the valve body 1, a control and adjustment groove 19 is opened on the front of the valve housing 11, a built-in groove 16 is opened on the bottom surface of the first control groove 13, and a connecting groove 17 is opened on one side of the first control groove 13. It should be noted that the high-pressure groove 15 and the low-pressure groove 18 are both connected to the inner cavity of the valve body 1, the built-in groove 16 is connected to the inner cavity of the valve body 1, and the two ends of the control and adjustment groove 19 are respectively connected to the high-pressure groove 15 and the low-pressure groove 18, while the valve port 4 is fixed at both ends of the valve housing 11, and the valve port 4 is sealed and connected to the external pipeline by bolts, and the movable groove 12 is opened at the top center position of the valve housing 11, and the movable groove 12 is opened at the top center position of the valve housing 11. When the wedge-type self-closing valve core 5 moves in the direction toward the bottom on the inner side of the moving groove 12, the wedge-type self-closing valve core 5 is stuck in the inner cavity of the valve body 1, and the wedge-type self-closing valve core 5 will completely seal the inner cavity of the valve body 1, thereby closing the inner cavity of the valve body 1 and closing the pipeline with the high-pressure large-diameter self-closing valve installed. When the wedge-type self-closing valve core 5 moves in the direction toward the outside on the inner side of the moving groove 12, the wedge-type self-closing valve core 5 will break away from the inner cavity of the valve body 1 and open the inner cavity of the valve body 1, thereby opening the inner cavity of the valve body 1 and opening the pipeline with the high-pressure large-diameter self-closing valve installed.

[0038] like Figures 1 to 12As shown, a side plate 131 is provided inside the first control groove 13, a circular groove 132 is provided at the inner center of the side plate 131, a circular plate 133 is provided inside the circular groove 132, a V-shaped groove 134 is provided at the bottom of the circular plate 133, a connecting control groove 135 is provided on the bottom surface of the circular groove 132, a first channel 136 is provided on one side of the circular groove 132, a second channel 137 is provided on the other side of the circular groove 132, and the first channel 136 is connected to the control and adjustment groove 19. It should be noted that one of the functions of the side plate 131 is to seal the outside of the first control groove 13, and it should also be noted that the channel of the V-shaped groove 134 is connected to the connecting control groove 135, the first channel 136 and the second channel 137. 7 fits with each other, and the first channel 136 and the second channel 137 are symmetrically arranged on both sides of the communication control groove 135, so that the V-shaped groove 134 can only be connected with the communication control groove 135 and the first channel 136 or with the communication control groove 135 and the second channel 137 at the same time, that is, when the V-shaped groove 134 is in a state of being connected with the communication control groove 135 and the first channel 136, since the communication control groove 135 is connected with the inner cavity of the valve housing 11, the high-pressure fluid in the inner cavity of the valve housing 11 can directly enter the communication control groove 135, and the high-pressure fluid in the communication control groove 135 can enter the first channel 136 through the V-shaped groove 134, so that the first channel 136 is filled with the high-pressure fluid;

[0039] When the V-shaped groove 134 is in a state of being connected with the connecting control groove 135 and the second channel 137, since the connecting control groove 135 is connected with the inner cavity of the valve housing 11, the high-pressure fluid in the inner cavity of the valve housing 11 can directly enter the connecting control groove 135, and the high-pressure fluid in the connecting control groove 135 can enter the second channel 137 through the V-shaped groove 134, so that the second channel 137 is filled with high-pressure fluid.

[0040] A rotating shaft 138 is fixedly connected to the inner center position of the circular plate 133, one end of the rotating shaft 138 is fixedly connected to a first gear 139, a second gear 1310 is meshed on the side of the first gear 139, and a hydraulic cylinder 1311 is movably connected to one side of the second gear 1310. It should be noted that the rotating shaft 138 is fixedly connected to the first gear 139 after passing through the side plate 131. A microprocessor can be arranged inside the valve housing 11, and a control module for controlling the hydraulic cylinder 1311 is loaded on the microprocessor. A power supply module and a communication module can also be arranged inside the valve housing 11. The types of the power supply module and the communication module are adaptively selected by those skilled in the art according to the specific use scenarios and specifications of the high-pressure large-diameter self-closing valve. The communication module can be connected to the background terminal through a wireless network, and the technicians can directly control the high-pressure large-diameter self-closing valve through the background terminal, specifically, the high-pressure large-diameter self-closing valve is controlled by the hydraulic cylinder 1311. The specific process is as follows:

[0041] First, set the V-shaped groove 134 to be in a state of being connected to the connecting control groove 135 and the first channel 136, that is, the first channel 136 is filled with high-pressure fluid. When the state of the V-shaped groove 134 needs to be changed, the technician only needs to control the hydraulic cylinder 1311 through the background terminal. In addition, it should be noted that one end of the hydraulic cylinder 1311 is rotatably connected to the end cover 2, and the other end of the hydraulic cylinder 1311 is rotatably connected to the side of the second gear 1310 through a hydraulic rod. When the hydraulic cylinder 1311 is turned on, the hydraulic cylinder 1311 can drive the second gear 1310 through the hydraulic rod to rotate the second gear 1310, and the rotating second gear 1310 can drive the first gear 139 to rotate, and the rotating first gear The wheel 139 can drive the rotating shaft 138 to rotate, and the rotating rotating shaft 138 will drive the circular plate 133 to rotate a certain angle. When the circular plate 133 rotates a certain angle, the position of the V-shaped groove 134 will be changed. The rotation angle of the circular plate 133 is adaptively selected by technical personnel in this field according to the positions of the first channel 136 and the second channel 137. When the V-shaped groove 134 is in a position connected to the connecting control groove 135 and the first channel 136, the V-shaped groove 134 is converted to a position connected to the connecting control groove 135 and the second channel 137. The second channel 137 will be filled with high-pressure fluid. Otherwise, the first channel 136 will be filled with high-pressure fluid.

[0042] A connecting channel 141 is provided inside the second control groove 14, one end of the connecting channel 141 is connected to the second channel 137, and the other end of the connecting channel 141 is connected to the control and adjustment groove 19. It should be noted that a sealing plate of the same size as the side plate 131 is provided on the outer side of the second control groove 14, and the sealing plate can seal the outside of the second control groove 14. Since one end of the connecting channel 141 is connected to the second channel 137, when the second channel 137 is filled with high-pressure fluid, the high-pressure fluid in the second channel 137 can enter the connecting channel 141, and the other end of the connecting channel 141 is connected to the control and adjustment groove 19, so the high-pressure fluid entering the connecting channel 141 will also enter the control and adjustment groove 19 through the other end of the connecting channel 141.

[0043] Example 3

[0044] like Figures 1 to 12As shown, the control mechanism 6 includes a mechanism housing 61, which matches the control adjustment groove 19, a movable sealing block 62 is arranged on the inner side of the mechanism housing 61, and communication ports 63 are provided on both sides of the mechanism housing 61, and the communication ports 63 on both sides are respectively connected to the first channel 136 and the connecting channel 141, and sealing blocks 66 are slidably connected at both ends of the mechanism housing 61, and a first groove 64 and a second groove 65 are provided on the inner side of the sealing block 66, and the sealing block 66 matches the high-pressure groove 15 and the low-pressure groove 18. It should be noted that the mechanism housing 61 seals the external port of the control adjustment groove 19, and the mechanism housing 61 and the interior of the control adjustment groove 19 form a sealed sliding cavity, and the movable sealing block 62 divides the sealed sliding cavity into two cavities on the one hand, and can slide in the sealed sliding cavity on the other hand, and the communication ports 63 on both sides are respectively connected to the first channel 136 and the connecting The connecting channel 141 is connected, so the high-pressure fluid in the first channel 136 can enter between the mechanism housing 61 and the sealing block 66 through the connecting port 63, and the high-pressure fluid in the connecting channel 141 can also enter between the mechanism housing 61 and the sealing block 66 through the connecting port 63, and the sealing slide cavity is filled with hydraulic oil. In this way, when the high-pressure fluid in the first channel 136 enters between the mechanism housing 61 and the sealing block 66 through the connecting port 63, that is, the first groove 64 and the second groove 65, the movable sealing block 62 will move to one side of the sealing slide cavity, that is, one of the sealing blocks 66 seals the high-pressure groove 15, and the other sealing block 66 opens the low-pressure groove 18 at the same time, so that the high-pressure fluid on the top surface of the wedge-type self-closing valve core 5 will be released. At this time, the wedge-type self-closing valve core 5 can be moved upward by rotating the control wheel 3, so that the inner cavity of the valve housing 11 is connected.

[0045] When the high-pressure fluid in the connecting channel 141 can enter between the mechanism housing 61 and the sealing block 66, that is, the first groove 64 and the second groove 65, through the connecting port 63, the movable sealing block 62 will move to one side of the sealing sliding cavity, that is, one of the sealing blocks 66 opens the high-pressure groove 15, and the other sealing block 66 seals the low-pressure groove 18 at the same time, so that the high-pressure fluid inside the valve housing 11 will enter the top surface of the wedge-type self-closing valve core 5, and exert pressure on the top surface of the wedge-type self-closing valve core 5. At this time, the control wheel 3 can be rotated to move the wedge-type self-closing valve core 5 downward to close the inner cavity of the valve housing 11.

[0046] The wedge-type self-closing valve core 5 includes a valve core body 51, a sealing slider 52 is fixedly connected to the top surface of the valve core body 51, a ball nut 53 is installed in the middle position of the top surface of the valve core body 51, and a limiting hole 54 is provided on the top surface of the valve core body 51 near the two sides of the ball nut 53. A plurality of grooves are provided on the side of the valve core body 51, and a plurality of protrusions matching the grooves are fixedly connected to the surface of the inclined seat 7. It should be noted that the shape of the valve core body 51 is an inverted trapezoid. Since a plurality of grooves are provided on the side of the valve core body 51 and a plurality of protrusions matching the grooves are fixedly connected to the surface of the inclined seat 7, the contact area between the valve core body 51 and the inclined seat 7 is increased, so that the sealing effect of the valve core body 51 can be improved. The sealing slider 52 matches with the movable groove 12, and the groove formed by the sealing slider 52 and the top surface of the valve core body 51 helps the high-pressure fluid on the top surface of the valve core body 51 to apply pressure to the top surface of the valve core body 51.

[0047] The bottom surface of the end cover 2 is fixedly connected to the limit rod 23, and the control wheel 3 includes a wheel body 31. The bottom surface of the wheel body 31 is fixedly connected to the threaded rod 32, and the threaded rod 32 passes through the end cover 2 and cooperates with the ball nut 53. It should be noted that the technician can drive the threaded rod 32 through the wheel body 31 to rotate the threaded rod 32, and the rotating threaded rod 32 can cooperate with the ball nut 53 to move the valve core body 51 on the inner side of the movable groove 12. A pressure groove 22 is provided on the bottom surface of the end cover 2, and the top ends of the high-pressure groove 15 and the low-pressure groove 18 are connected to the pressure groove 22. The limit rod 23 is matched with the limit hole 54 on the top surface of the valve core body 51 to ensure the stability of the valve core body 51 during the movement process. An arc groove 21 is provided on one side of the end cover 2, and the arc groove 21 is matched with the second gear 1310 to ensure that the second gear 1310 can rotate freely.

[0048] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A high-pressure large-caliber self-closing valve, characterized in that: include: The valve body (1) is sealed with an end cover (2) at the middle position of the top, a control wheel (3) is rotatably connected to the center position of the top surface of the end cover (2), and valve ports (4) are fixedly connected to both ends of the valve body (1); A wedge-type self-closing valve core (5) is arranged on the inner side of the valve body (1); a control wheel (3) is used to control the position of the wedge-type self-closing valve core (5); an inclined seat (7) that matches the wedge-type self-closing valve core (5) is fixedly connected to the inner side of the valve body (1) near the position of the wedge-type self-closing valve core (5); The control mechanism (6) is arranged on one side of the valve body (1). The control mechanism (6) controls the fluid inside the valve body (1) and applies the pressure of the fluid to the top surface of the wedge-type self-closing valve core (5).

2. A high-pressure large-diameter self-closing valve according to claim 1, characterized in that: The valve body (1) comprises a valve shell (11), a movable groove (12) is provided on the top of the valve shell (11), a first control groove (13) and a second control groove (14) are provided at both ends of the valve shell (11), a high-pressure groove (15) and a low-pressure groove (18) are provided on the top surface of the valve body (1), a control adjustment groove (19) is provided on one side of the valve shell (11), a built-in groove (16) is provided on the bottom surface of the first control groove (13), and a connecting groove (17) is provided on one side of the first control groove (13).

3. A high-pressure large-diameter self-closing valve according to claim 2, characterized in that: The first control groove (13) is provided with a side plate (131) inside, a circular groove (132) is provided at the inner center of the side plate (131), a circular plate (133) is provided inside the circular groove (132), a V-shaped groove (134) is provided at the bottom of the circular plate (133), a connecting control groove (135) is provided on the bottom surface of the circular groove (132), a first channel (136) is provided on one side of the circular groove (132), a second channel (137) is provided on the other side of the circular groove (132), and the first channel (136) is connected to the control and adjustment groove (19).

4. A high-pressure large-diameter self-closing valve according to claim 3, characterized in that: A connecting channel (141) is provided inside the second control groove (14), one end of the connecting channel (141) is connected to the second channel (137), and the other end of the connecting channel (141) is connected to the control adjustment groove (19).

5. A high-pressure large-diameter self-closing valve according to claim 4, characterized in that: The control mechanism (6) comprises a mechanism housing (61), the mechanism housing (61) is matched with the control adjustment groove (19), a movable sealing block (62) is arranged on the inner side of the mechanism housing (61), communication ports (63) are provided on both sides of the mechanism housing (61), and the communication ports (63) on both sides are respectively connected to the first channel (136) and the connecting channel (141), and sealing blocks (66) are slidably connected at both ends of the mechanism housing (61), and a first groove (64) and a second groove (65) are provided on the inner side of the sealing block (66).

6. A high-pressure large-diameter self-closing valve according to claim 1, characterized in that: The wedge-type self-closing valve core (5) comprises a valve core body (51), the top surface of the valve core body (51) is fixedly connected with a sealing slider (52), a ball nut (53) is installed in the middle position of the top surface of the valve core body (51), and limiting holes (54) are provided on both sides of the top surface of the valve core body (51) close to the ball nut (53).

7. A high-pressure large-diameter self-closing valve according to claim 6, characterized in that: The bottom surface of the end cover (2) is fixedly connected to a limit rod (23); the control wheel (3) comprises a wheel body (31); the bottom surface of the wheel body (31) is fixedly connected to a threaded rod (32); the threaded rod (32) passes through the end cover (2) and cooperates with a ball nut (53).

8. A high-pressure large-diameter self-closing valve according to claim 6, characterized in that: A groove is provided on the side of the valve core body (51), and a protrusion which fits in the groove is fixedly connected to the surface of the inclined seat (7).

9. A high-pressure large-diameter self-closing valve according to claim 5, characterized in that: The sealing block (66) fits with the high-pressure groove (15) and the low-pressure groove (18).

10. A high pressure large diameter self-closing valve according to claim 3, characterized in that: A rotating shaft (138) is fixedly connected to the inner center of the circular plate (133); one end of the rotating shaft (138) is fixedly connected to a first gear (139); a second gear (1310) is meshed on the side of the first gear (139); and a hydraulic cylinder (1311) is movably connected to one side of the second gear (1310).

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