An integrated large-diameter self-closing valve

Abstract

The present invention discloses an integrated large-caliber self-closing valve, which relates to the technical field of wedge-type gate valves, comprising a gate valve housing, two ends of which are respectively connected to a first port and a second port, a valve core mechanism is arranged at the center position of the top surface of the gate valve housing, and a self-closing mechanism is arranged on the top surface of the valve core mechanism, the valve core mechanism is automatically opened by utilizing the pressure difference between the first port and the second port, and the self-closing mechanism is automatically closed by utilizing the pressure difference between the first port and the second port; through the arranged self-closing mechanism, the automatic downward movement of the wedge-type valve core can be realized by only opening the solenoid valve, and when the wedge-type valve core drops to the lowest point, the wedge-type valve core will completely close the gate valve channel, the upward pressure of the high-pressure fluid in the first port on the wedge-type valve core is minimized, and the pressure on the first movable plate remains unchanged, so the wedge-type valve core will continue to be subjected to a clamping force, thereby ensuring the sealing effect on the gate valve channel and preventing excessive supply or leakage of the fluid.

Description

Technical Field

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

[0002] The existing wedge gate valve does not have a self-closing function, which means that after the wedge gate valve completes the conveying function, an additional actuator is required to close the wedge gate valve.

[0003] For example, a wedge-tightened gate valve disclosed in Chinese patent application with publication number CN114352758A and a straight-through wedge gate valve disclosed in Chinese patent application with publication number CN103867739AA. After such wedge gate valves are opened, the valve core inside the wedge gate valve will be subjected to the stamping effect of the high-pressure fluid, causing the valve core to encounter greater resistance when closing the channel. This requires a high-load actuator to close the wedge gate valve, greatly increasing the production cost of the integrated large-diameter wedge gate valve. In addition, the special valve core structure of the wedge gate valve will cause the side of the special valve core close to the pressure fluid to continue to be subjected to the stamping effect of high pressure after the valve is closed, which can easily cause the wedge gate valve to leak after long-term use. Summary of the invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide an integrated large-diameter self-closing valve to solve the problem in the prior art that the wedge-type gate valve does not have a self-closing function, and the special valve core structure of the wedge-type gate valve will continue to be subjected to high-pressure stamping on the side of the special valve core close to the pressure fluid after the valve is closed, resulting in leakage after long-term use.

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

[0006] Specifically, an integrated large-diameter self-closing valve is provided, including a gate valve housing, with a first port and a second port respectively connected at both ends thereof, a valve core mechanism is arranged at the center position of the top surface of the gate valve housing, and a self-closing mechanism is arranged on the top surface of the valve core mechanism, the valve core mechanism automatically opens by utilizing the pressure difference between the first port and the second port, and the self-closing mechanism automatically closes the valve core mechanism by utilizing the pressure difference between the first port and the second port.

[0007] As a further solution of the present invention: a gate valve body is arranged inside the gate valve housing, a sealing block is arranged in the middle position of the gate valve body, a first sealing plate is arranged on the front side of the gate valve body close to the first port, and a second sealing plate is arranged on the front side of the gate valve body close to the second port.

[0008] As a further solution of the present invention: a gate valve channel runs through the interior of the gate valve body, a wedge-shaped groove is provided at the center of the top surface of the gate valve body, an arc block is fixedly connected to the bottom of the wedge-shaped groove, a first cavity is provided on one side of the front of the gate valve body, a second cavity is provided on the other side of the front of the gate valve body, a high-pressure connecting groove is provided between the gate valve channel and the first cavity, a control channel is connected between the first cavity and the second cavity, and a solenoid valve is arranged inside the control channel.

[0009] As a further solution of the present invention: a vertically arranged limiting sliding groove is provided at the inner center position of the sealing stopper, and a connecting channel is provided at a position of the top surface of the sealing stopper close to the limiting sliding groove.

[0010] As a further solution of the present invention: the valve core mechanism includes a mounting plate, a lead screw is rotatably connected to the center position of the top surface of the mounting plate, a wedge-type valve core is nested on the side of the lead screw, and limit sliders that match the limit slots are fixedly connected to the positions near the limit slots on both sides of the wedge-type valve core.

[0011] As a further solution of the present invention: an arc-shaped groove is provided at the center of the bottom surface of the wedge-shaped valve core, and the arc-shaped groove and the arc-shaped block fit each other.

[0012] As a further solution of the present invention: an inner groove is provided on the side of the wedge-type valve core.

[0013] As a further solution of the present invention: the self-closing mechanism includes a lifting ring, the bottom surface of which is fixedly connected to a first piston rod, a cylindrical groove matching the first piston rod is provided inside the gate valve housing near the first piston rod, a limiting hole matching the first piston rod is provided on the top surface of the mounting plate near the first piston rod, and a hydraulic hole is provided on the top surface of the gate valve body near the cylindrical groove.

[0014] As a further solution of the present invention: a second piston rod is fixedly connected to the inner side of the lifting ring, and a hydraulic cylinder matching the second piston rod is fixedly connected to the top surface of the mounting plate near the second piston rod.

[0015] As a further solution of the present invention: a first movable plate and a second movable plate are respectively disposed inside the first cavity and the second cavity, and hydraulic oil is filled between the first movable plate and the second movable plate.

[0016] Beneficial effects of the present invention:

[0017] In the present invention, by the self-closing mechanism, when the gate valve channel completes the fluid conveying task, the wedge-type valve core can be automatically moved downward by just opening the solenoid valve. When the solenoid valve is opened, the first cavity and the second cavity are connected through the control channel. Since one side of the first movable plate in the first cavity is subjected to the pressure of the high-pressure fluid in the first port, the first movable plate will move toward the outer end in the first cavity, squeezing the hydraulic oil in the first cavity. In this way, the hydraulic oil in the first cavity can enter the second cavity through the control channel, so that the hydraulic oil in the second cavity can act on the outer side of the second sealing plate, and the second sealing plate will move toward the inner end of the second cavity. When the second sealing plate moves, it will drive the hydraulic movable plate to move synchronously. The moving hydraulic movable plate will increase the space of the hydraulic oil cavity, so that the hydraulic oil cavity can suck the hydraulic oil in the cylindrical groove through the hydraulic hole. The first piston rod corresponding to it moves downward in the cylindrical groove, and the downwardly moving first piston rod will drive the lifting ring to move downward synchronously, and the other two first piston rods will also move downward under the drive of the lifting ring, so that the other two first piston rods will squeeze the hydraulic oil in the corresponding cylindrical groove, so that the hydraulic oil in the cylindrical groove enters the limiting slide groove through the connecting channel, and the hydraulic oil entering the limiting slide groove will act on the top of the limiting slider, so that the limiting slider moves downward along the limiting slide groove, and the wedge valve core continues to move downward. When the wedge valve core drops to the lowest point, the wedge valve core will completely close the gate valve channel. At the same time, the upward pressure of the high-pressure fluid in the first port on the wedge valve core is minimized, and the pressure on the first movable plate remains unchanged, so the wedge valve core will continue to be subjected to the clamping force to ensure the sealing effect of the gate valve channel and prevent excessive supply or leakage of the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of the integrated large-caliber self-closing valve of the present invention;

[0020] Figure 2 It is a schematic diagram of the internal structure of the integrated large-caliber self-closing valve of the present invention;

[0021] Figure 3 It is a schematic diagram of the internal structure of the gate valve housing in the present invention;

[0022] Figure 4 It is a front view of the internal structure of the gate valve housing in the present invention;

[0023] Figure 5 It is a structural schematic diagram of the gate valve body and the sealing block in the present invention;

[0024] Figure 6 It is a structural schematic diagram of the gate valve body in the present invention;

[0025] Figure 7 It is a structural schematic diagram of the sealing block in the present invention;

[0026] Figure 8 It is a structural schematic diagram of the valve core mechanism in the present invention;

[0027] Fig. 9 It is a structural schematic diagram of the self-closing mechanism in the present invention;

[0028] Fig.10 It is a partial cross-sectional view of the second cavity in the present invention.

[0029] Reference numerals: 1, gate valve housing; 11, gate valve body; 111, gate valve channel; 112, wedge groove; 113, arc block; 114, high-pressure connecting groove; 115, first cavity; 116, control channel; 117, second cavity; 1171, hydraulic oil chamber; 118, hydraulic hole; 12, sealing block; 121, limit slide groove; 122, connecting channel; 13, first sealing plate; 131, first moving plate; 1 4. Second sealing plate; 141. Second movable plate; 1411. Hydraulic movable plate; 2. First port; 3. Second port; 4. Valve core mechanism; 41. Mounting plate; 42. Lead screw; 43. Wedge-type valve core; 44. Ball nut; 45. Arc groove; 46. Limit slider; 47. Inner groove; 48. Limit hole; 49. Hydraulic cylinder; 5. Self-closing mechanism; 51. Lifting ring; 52. First piston rod; 53. Second piston rod. DETAILED DESCRIPTION

[0030] 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.

[0031] Example 1

[0032] like Figure 1 - Fig. 9As shown, the present invention discloses an integrated large-caliber self-closing valve, including a gate valve housing 1, with a first port 2 and a second port 3 connected at both ends thereof, a valve core mechanism 4 is arranged at the center position of the top surface of the gate valve housing 1, and a self-closing mechanism 5 is arranged on the top surface of the valve core mechanism 4, the valve core mechanism 4 automatically opens by utilizing the pressure difference between the first port 2 and the second port 3, and the self-closing mechanism 5 automatically closes the valve core mechanism 4 by utilizing the pressure difference between the first port 2 and the second port 3. It should be noted that the first port 2 is used to connect to a fluid input pipeline, and the second port 3 is used to connect to a fluid output pipeline. The fluids in the fluid input pipeline and the fluid output pipeline can be either liquid or gas. Since the first port 2 is connected to the fluid input pipeline, the fluid entering the first port 2 is a high-pressure fluid, so that a pressure difference is generated between the first port 2 and the second port 3. Therefore, the integrated large-caliber self-closing valve can be installed in a scene where a self-closing function is required. When the valve core mechanism 4 needs to be opened, the technician can automatically open the valve core mechanism 4 by utilizing the pressure difference between the first port 2 and the second port 3.

[0033] In order to enable technicians to remotely control the integrated large-diameter self-closing valve at the background terminal, a control module, a wireless network module and a power module can be integrated on the integrated large-diameter self-closing valve. The power module provides power for the control module and the wireless network module. A PLC circuit board and a microprocessor are installed inside the gate valve housing 1. The control module can be loaded on the microprocessor. A group of rotating power generation mechanisms are arranged inside the first port 2 or the second port 3. The rotating power generation mechanism includes an impeller, a power generation coil and a resistor. The impeller is installed inside the first port 2 or the second port 3. When fluid flows inside the first port 2 or the second port 3, the impeller will rotate, and the rotating impeller will also drive the power generation coil to rotate, and the rotating power generation coil will generate current. The power generation coil is connected to the power module through a resistor to ensure that the power generation coil can charge the power module and ensure the endurance of the power module. The specifications and installation positions of the impeller, the power generation coil and the resistor are adaptively selected by technical personnel in this field according to the specific size of the first port 2 or the second port 3 and the set scene to ensure that the power module can be charged.

[0034] A flow meter needs to be installed inside the first port 2. The control module collects the flow data of the first port 2 in real time through the flow meter, and converts the flow data into electrical signals and transmits them to the wireless network module. The wireless network module then transmits the electrical signals to the background terminal. The technician can remotely monitor the flow of the fluid inside the first port 2 through the background terminal. When the flow of the fluid through the first port 2 reaches the set value, the technician can remotely operate the control module through the background terminal and the wireless network module, so that the control module can close the valve core mechanism 4 through the self-closing mechanism 5, so that the integrated large-diameter self-closing valve can automatically close after completing the delivery task, so as to prevent excessive supply or leakage of the fluid.

[0035] Example 2

[0036] like Figure 1 - Figure 6 As shown, a gate valve body 11 is arranged inside the gate valve housing 1, a sealing block 12 is arranged in the middle position of the gate valve body 11, a first sealing plate 13 is arranged on the front side of the gate valve body 11 close to the first port 2, and a second sealing plate 14 is arranged on the front side of the gate valve body 11 close to the second port 3. It should be noted that the gate valve housing 1 completely seals and covers the gate valve body 11, and the gate valve housing 1 and the gate valve body 11 can be die-cast as one piece or can adopt a split structure. The gate valve housing 1 and the gate valve body 11 formed by die-casting as one piece have low production cost and high production efficiency, but are difficult to maintain. The gate valve housing 1 and the gate valve body 11 with a split structure have high production cost but simple maintenance. The specific method is adaptively selected by technical personnel in this field according to the production situation of the integrated large-diameter self-closing valve and the price of the same type of wedge gate valves on the market.

[0037] like Figure 1 - Figure 6 As shown, a gate valve channel 111 runs through the gate valve body 11, a wedge-shaped groove 112 is provided at the center of the top surface of the gate valve body 11, an arc block 113 is fixedly connected to the bottom of the wedge-shaped groove 112, a first cavity 115 is provided on one side of the front of the gate valve body 11, a second cavity 117 is provided on the other side of the front of the gate valve body 11, a high-pressure connecting groove 114 is provided between the gate valve channel 111 and the first cavity 115, a control channel 116 is connected between the first cavity 115 and the second cavity 117, an electromagnetic valve is arranged inside the control channel 116, and the electromagnetic valve is connected to the control module in the gate valve body 11 through a wire, and the control module can directly control the opening and closing of the electromagnetic valve, that is, the opening or closing of the control channel 116.

[0038] It should be noted that the gate valve channel 111 is opened at the inner center position of the gate valve body 11, one end of the gate valve channel 111 is connected to the first port 2, and the other end of the gate valve channel 111 is connected to the second port 3. When the gate valve channel 111 is in an open state, the fluid in the first port 2 can be transported to the inside of the second port 3 through the gate valve channel 111. There are two groups of sealing blocks 12, and the two groups of sealing blocks 12 are symmetrically arranged at both ends of the wedge-shaped groove 112. The cavity composed of the two groups of sealing blocks 12 and the wedge-shaped groove 112 fits the internal structure of the valve core mechanism 4, ensuring that the valve core mechanism 4 can open or close the gate valve channel 111. Since a high-pressure connecting groove 114 is opened between the gate valve channel 111 and the first cavity 115, the fluid in the first port 2 will directly enter the high-pressure connecting groove 114 through the gate valve channel 111, and the fluid entering the high-pressure connecting groove 114 will directly act on the inner side of the first cavity 115, so that the inner side of the first cavity 115 is always subjected to the pressure of the high-pressure fluid.

[0039] The first cavity 115 and the second cavity 117 are not limited to the attached Figure 6 The shape is not limited to the attached Figure 6 The first cavity 115 and the second cavity 117 can be arranged at any position on the gate valve body 11 by technicians in this field according to the functions of the first cavity 115 and the second cavity 117, ensuring that the first cavity 115 and the second cavity 117 do not affect the function of the gate valve channel 111 to transport fluid.

[0040] A vertically arranged limiting sliding groove 121 is provided at the inner center of the sealing stopper 12 , and a connecting channel 122 is provided at a position close to the limiting sliding groove 121 on the top surface of the sealing stopper 12 .

[0041] like Figure 1 - Fig. 9As shown, the valve core mechanism 4 includes a mounting plate 41, a lead screw 42 is rotatably connected to the center of the top surface of the mounting plate 41, a wedge-type valve core 43 is nested on the side of the lead screw 42, and the positions on both sides of the wedge-type valve core 43 near the limit slide groove 121 are fixedly connected with limit sliders 46 that match the limit slide groove 121. It should be noted that the top of the wedge-type valve core 43 is fixedly connected to a ball nut 44 near the lead screw 42, and the ball nut 44 matches the lead screw 42. When the technician needs to manually open or close the integrated large-caliber self-closing valve on site , just use an L-shaped hexagonal screwdriver, insert the L-shaped hexagonal screwdriver into the hexagonal groove at the top of the lead screw 42, and then rotate the lead screw 42 by turning the L-shaped hexagonal screwdriver. The rotating lead screw 42 cooperates with the ball nut 44 on the top of the wedge-shaped valve core 43 to enable the wedge-shaped valve core 43 to rise or fall inside the wedge-shaped groove 112. When the wedge-shaped valve core 43 rises inside the wedge-shaped groove 112, the integrated large-diameter self-closing valve is opened, and when the wedge-shaped valve core 43 falls inside the wedge-shaped groove 112, the integrated large-diameter self-closing valve is closed.

[0042] like Figure 6 and Figure 8 As shown, an arc groove 45 is provided at the center of the bottom surface of the wedge-shaped valve core 43, and the arc groove 45 and the arc block 113 fit each other. It should be noted that, since the arc groove 45 and the arc block 113 fit each other, the wedge-shaped valve core 43 drops to the lowest position inside the wedge-shaped groove 112, that is, the position where the surface of the arc groove 45 contacts the top surface of the arc block 113. Since the surface of the arc groove 45 and the top surface of the arc block 113 will greatly increase the contact area between the wedge-shaped valve core 43 and the wedge groove 112, the larger the contact area, the lower the pressure. The effect of the wedge-shaped valve core 43 sealing the wedge-shaped groove 112 can be improved, and the closed sealing of the integrated large-diameter self-closing valve can be ensured. In addition, it should be noted that since the position of the arc groove 45 is opened near the gate valve channel 111, when the wedge-shaped valve core 43 moves upward inside the wedge groove 112, the upward movement of the wedge-shaped valve core 43 can be reduced. When the arc groove 45 coincides with the gate valve channel 111, the effect of the gate valve channel 111 in conveying fluid can be ensured, thereby reducing the overall volume of the integrated large-diameter self-closing valve.

[0043] like Figure 2 and Figure 8As shown, an inner groove 47 is provided on the side of the wedge-type valve core 43. It should be noted that the inner groove 47 needs to be provided on the side close to the first port 2. When the wedge-type valve core 43 closes the gate valve channel 111, the side of the wedge-type valve core 43 close to the first port 2 will be subjected to the pressure of the high-pressure fluid in the gate valve channel 111, and the top surface of the inner groove 47 will also be subjected to the high pressure. The wedge-type valve core 43 subjected to the high pressure will generate an upward force. When the wedge-type valve core 43 is released, the wedge-type valve core 43 will automatically move upward under the pressure of the upward force, so that the wedge-type valve core 43 automatically opens the gate valve channel 111.

[0044] Example 3

[0045] like Figure 1 - Fig.10 As shown, the self-closing mechanism 5 includes a lifting ring 51, and a first piston rod 52 is fixedly connected to the bottom surface of the lifting ring 51. A cylindrical groove matching the first piston rod 52 is provided inside the gate valve housing 1 near the first piston rod 52, and a limiting hole 48 matching the first piston rod 52 is provided on the top surface of the mounting plate 41 near the first piston rod 52. A hydraulic hole 118 is provided on the top surface of the gate valve body 11 near the cylindrical groove. It should be noted that there are four first piston rods 52, and the four first piston rods 52 are equidistantly fixedly connected to the bottom surface of the lifting ring 51. A through hole is provided inside the first piston rod 52, and the inside of the through hole needs to be filled with hydraulic oil. The specifications of the hydraulic oil are adaptively selected by technical personnel in this field according to the use scenarios and specifications of the integrated large-diameter self-closing valve.

[0046] It should also be noted that the hydraulic holes 118 are in two groups, two of the four first piston rods 52 are aligned with the hydraulic holes 118 , and the other two are aligned with the connecting channels 122 .

[0047] A hydraulic oil chamber 1171 is provided on the inner side of the second cavity 117, and the hydraulic oil chamber 1171 is connected to the hydraulic hole 118. The inner end of the second movable plate 141 is connected to the hydraulic movable plate 1411 through a long rod. When the second movable plate 141 moves toward the inner end in the second cavity 117, the second movable plate 141 increases the volume of the hydraulic oil chamber 1171 through the hydraulic movable plate 1411, so that the hydraulic oil in the hydraulic hole 118 enters the hydraulic oil chamber 1171. When the second movable plate 141 moves toward the outer end in the second cavity 117, the second movable plate 141 reduces the volume of the hydraulic oil chamber 1171 through the hydraulic movable plate 1411, so that the hydraulic oil in the hydraulic oil chamber 1171 enters the hydraulic hole 118.

[0048] A second piston rod 53 is fixedly connected to the inner side of the lifting ring 51, and a hydraulic cylinder 49 that matches the second piston rod 53 is fixedly connected to the top surface of the mounting plate 41 near the second piston rod 53. A first movable plate 131 and a second movable plate 141 are respectively arranged inside the first cavity 115 and the second cavity 117, and hydraulic oil is filled between the first movable plate 131 and the second movable plate 141. It should be noted that when the hydraulic cylinder 49 is opened, the hydraulic cylinder 49 can drive the second piston rod 53. Since the second piston rod 53 is fixedly connected to the lifting ring 51, the moving second piston rod 53 will drive the lifting ring 51 to rise synchronously. At this time, the solenoid valve in the control channel 116 needs to be opened through the control module. When the lifting ring 51 rises, the lifting ring 51 will drive the four first piston rods 52 to rise synchronously. The rising first piston rod 52 will increase the volume of the cylindrical groove opened near the position of the first piston rod 52 of the gate valve body 11, so that the hydraulic pressure of the hydraulic oil in the cylindrical groove will be reduced.

[0049] Therefore, the cylindrical groove connected to the hydraulic hole 118 will suck the hydraulic oil in the hydraulic oil chamber 1171 through the hydraulic hole 118, so that the volume of the hydraulic oil chamber 1171 will be reduced, that is, the hydraulic movable plate 1411 will move toward the second cavity 117, and the hydraulic movable plate 1411 and the second sealing plate 14 are fixedly connected by a long rod, so the second sealing plate 14 will move outward synchronously. When the second sealing plate 14 moves outward, the second sealing plate 14 will squeeze the hydraulic oil in the second cavity 117 into the first cavity 115 through the control channel 116, and the hydraulic oil entering the first cavity 115 will act on the first movable plate 131, so that the first movable plate 131 overcomes the pressure of the high-pressure fluid in the first port 2 and moves toward the inside of the first cavity 115.

[0050] The cylindrical groove connected to the connecting channel 122 will suck the hydraulic oil in the limiting slide groove 121 through the connecting channel 122, so that the limiting slider 46 on the side of the wedge valve core 43 moves along the direction of the limiting slide groove 121. When the wedge valve core 43 moves upward, the gate valve channel 111 will be opened, so that the integrated large-diameter self-closing valve will be automatically opened.

[0051] It should also be noted that when the gate valve channel 111 is opened, the high-pressure fluid inside the first port 2 will enter the gate valve channel 111, so that the pressure of the first port 2 and the inside of the gate valve channel 111 is balanced, so that a force can be applied to the bottom surface of the wedge-type valve core 43. In this way, the force applied to the wedge-type valve core 43 will act on the hydraulic cylinder 49, balancing the pressure applied to the first movable plate 131 when it moves toward the inner side of the first cavity 115, thereby reducing the load on the hydraulic cylinder 49.

[0052] When the wedge valve core 43 completely opens the gate valve channel 111, that is, the arc groove 45 at the center position of the bottom surface of the wedge valve core 43 coincides with the gate valve channel 111, the hydraulic cylinder 49 and the solenoid valve in the control channel 116 can be closed at the same time. When the solenoid valve in the control channel 116 is closed, the space between the first cavity 115 and the second cavity 117 will be locked, that is, the hydraulic oil in the first cavity 115 and the second cavity 117 will be fixed, so that the wedge valve core 43 will be fixed in the open position.

[0053] When the gate valve channel 111 completes the fluid delivery task, it only needs to open the solenoid valve to realize the automatic downward movement of the wedge valve core 43, so that the gate valve channel 111 is automatically closed. The specific process is: when the solenoid valve is opened, the first cavity 115 and the second cavity 117 are connected through the control channel 116. Since one side of the first movable plate 131 in the first cavity 115 is subjected to the pressure of the high-pressure fluid in the first port 2, the first movable plate 131 will move toward the outer end in the first cavity 115, squeezing the hydraulic oil in the first cavity 115, so that the hydraulic oil in the first cavity 115 can be controlled. The channel 116 enters the second cavity 117, so that the hydraulic oil in the second cavity 117 can act on the outer side of the second sealing plate 14, and the second sealing plate 14 will move toward the inner end of the second cavity 117. When the second sealing plate 14 moves, it will drive the hydraulic movable plate 1411 to move synchronously. The moving hydraulic movable plate 1411 will increase the space of the hydraulic oil chamber 1171, so that the hydraulic oil chamber 1171 can suck the hydraulic oil in the cylindrical groove through the hydraulic hole 118. Even if the corresponding first piston rod 52 moves downward in the cylindrical groove, the downward moving first piston rod 52 will drive the lifting ring 51 to move downward synchronously.

[0054] The other two first piston rods 52 will also move downward under the drive of the lifting ring 51, so that the other two first piston rods 52 will squeeze the hydraulic oil in the corresponding cylindrical groove, so that the hydraulic oil in the cylindrical groove enters the limiting slide groove 121 through the connecting channel 122, and the hydraulic oil entering the limiting slide groove 121 will act on the top of the limiting slider 46, so that the limiting slider 46 moves downward along the limiting slide groove 121. Even if the wedge valve core 43 continues to move downward, when the wedge valve core 43 drops to the lowest point, the wedge valve core 43 will completely close the gate valve channel 111. At the same time, the upward pressure of the high-pressure fluid in the first port 2 on the wedge valve core 43 is minimized, and the pressure on the first movable plate 131 remains unchanged, so the wedge valve core 43 will continue to be subjected to the clamping force to ensure the sealing effect on the gate valve channel 111.

[0055] 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. An integrated large-caliber self-closing valve, characterized in that: include: A gate valve housing (1), with two ends thereof respectively connected to a first port (2) and a second port (3); A valve core mechanism (4) is arranged at the center of the top surface of the gate valve housing (1); A self-closing mechanism (5), which is arranged on the top surface of the valve core mechanism (4); The self-closing mechanism (5) automatically closes the valve core mechanism (4) by utilizing the pressure difference between the first port (2) and the second port (3).

2. An integrated large-caliber self-closing valve according to claim 1, characterized in that: A gate valve body (11) is arranged inside the gate valve housing (1), a sealing block (12) is arranged in the middle of the gate valve body (11), a first sealing plate (13) is arranged on the front side of the gate valve body (11) close to the first port (2), and a second sealing plate (14) is arranged on the front side of the gate valve body (11) close to the second port (3).

3. An integrated large-caliber self-closing valve according to claim 2, characterized in that: A gate valve channel (111) runs through the gate valve body (11); a wedge-shaped groove (112) is provided at the center of the top surface of the gate valve body (11); an arc block (113) is fixedly connected to the bottom of the wedge-shaped groove (112); a first cavity (115) is provided on one side of the front of the gate valve body (11); a second cavity (117) is provided on the other side of the front of the gate valve body (11); a high-pressure connecting groove (114) is provided between the gate valve channel (111) and the first cavity (115); a control channel (116) is connected between the first cavity (115) and the second cavity (117); and a solenoid valve is provided inside the control channel (116).

4. An integrated large-caliber self-closing valve according to claim 3, characterized in that: A vertically arranged limiting sliding groove (121) is provided at the inner center position of the sealing stopper (12), and a connecting channel (122) is provided at a position close to the limiting sliding groove (121) on the top surface of the sealing stopper (12).

5. An integrated large-caliber self-closing valve according to claim 4, characterized in that: The valve core mechanism (4) comprises a mounting plate (41), a lead screw (42) is rotatably connected to the center of the top surface of the mounting plate (41), a wedge-shaped valve core (43) is embedded in the side of the lead screw (42), and limiting sliders (46) that match the limiting slide groove (121) are fixedly connected to the positions of the two sides of the wedge-shaped valve core (43) near the limiting slide groove (121).

6. An integrated large-caliber self-closing valve according to claim 5, characterized in that: An arc-shaped groove (45) is provided at the center of the bottom surface of the wedge-shaped valve core (43), and the arc-shaped groove (45) and the arc-shaped block (113) fit each other.

7. The integrated large-caliber self-closing valve according to claim 5, characterized in that: An inner groove (47) is formed on the side surface of the wedge-shaped valve core (43).

8. The integrated large-caliber self-closing valve according to claim 5, characterized in that: The self-closing mechanism (5) comprises a lifting ring (51), the bottom surface of which is fixedly connected to a first piston rod (52), a cylindrical groove matching the first piston rod (52) is provided in the gate valve housing (1) near the first piston rod (52), a limiting hole (48) matching the first piston rod (52) is provided in the top surface of the mounting plate (41) near the first piston rod (52), and a hydraulic hole (118) is provided in the top surface of the gate valve body (11) near the cylindrical groove.

9. An integrated large-caliber self-closing valve according to claim 8, characterized in that: A second piston rod (53) is fixedly connected to the inner side of the lifting ring (51), and a hydraulic cylinder (49) matching the second piston rod (53) is fixedly connected to the top surface of the mounting plate (41) near the second piston rod (53).

10. The integrated large-caliber self-closing valve according to claim 3, characterized in that: A first movable plate (131) and a second movable plate (141) are respectively disposed inside the first cavity (115) and the second cavity (117), and hydraulic oil is filled between the first movable plate (131) and the second movable plate (141).

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