A gas field wellhead control device

Abstract

The present application relates to the technical fields of gas field wellhead, and specifically relates to a gas field wellhead control device, which comprises a controller, an electric actuator, a valve rod, a throttle valve, an air inlet and an air outlet; the electric actuator is fixedly installed on one side of the controller, the valve rod is fixedly installed on the bottom of the electric actuator, the throttle valve is fixedly installed on the bottom end of the valve rod, the air inlet is arranged on the bottom end of the throttle valve, the air outlet is arranged on the side of the throttle valve, the device further comprises a leakage prevention mechanism and an auxiliary sealing mechanism, the leakage prevention mechanism is fixedly installed in the throttle valve, and the auxiliary sealing mechanism is fixedly installed in the throttle valve, the present application solves the problem that the rubber ring on the valve core of the throttle valve of the existing gas field wellhead control device is prone to aging during long-term use, causing the sealing valve core to leak, thereby greatly reducing the sealing effect and service life, and realizes the automatic sealing of the gas field wellhead control device to prevent leakage.

Description

Technical Field

[0001] This invention relates to the field of gas field wellhead technology, and specifically to a gas field wellhead control device. Background Technology

[0002] A gas field wellhead control unit is a system of equipment used to monitor, manage, and regulate the operation of natural gas wells. It is typically installed at the wellhead of the gas field, where the surface equipment for the gas well is located, and is designed to ensure the safe operation, production, and real-time monitoring of the gas well.

[0003] The gas field wellhead control device consists of an intelligent controller, an electric actuator, a throttle valve, and a pressure sensor. It can control the opening and closing of the throttle valve remotely or manually, thereby controlling and monitoring the flow at the gas field wellhead.

[0004] In existing gas field wellhead control devices, the gas flow rate at the wellhead is generally controlled by a throttle valve to transport the gas. However, since the internal gas flow rate control usually requires opening and closing the throttle valve, and the internal gas pressure is relatively high, the rubber ring on the throttle valve core is prone to aging during long-term use, causing leakage of the sealing valve core. This greatly reduces the sealing effect. When leakage occurs, the excessive internal gas pressure will make the leakage of the valve core more serious, and it cannot be dealt with in time, resulting in serious accidents.

[0005] In view of this, and to address the aforementioned shortcomings, this invention develops a gas field wellhead control device. Summary of the Invention

[0006] The purpose of this invention is to provide a gas field wellhead control device that can prevent leakage, thereby preventing gas leakage caused by the aging of the valve core sealing rubber ring after long-term use, which would otherwise be impossible to handle in a timely manner.

[0007] This invention provides the following technical solution: a gas field wellhead control device, comprising a controller, an electric actuator, a valve stem, a throttle valve, an inlet, and an outlet; the electric actuator is fixedly installed on one side of the controller, the valve stem is fixedly installed at the bottom of the electric actuator, the throttle valve is fixedly installed at the bottom end of the valve stem, the inlet is provided at the bottom end of the throttle valve, and the outlet is provided on the side of the throttle valve; it also includes a leak-proof mechanism and an auxiliary sealing mechanism; the leak-proof mechanism is fixedly installed inside the throttle valve, and the leak-proof mechanism closes by axially moving the valve stem and radially rotating the sealing plate, sealing the gas by the tight fit under positive gas pressure; the auxiliary sealing mechanism is fixedly installed inside the throttle valve, and the auxiliary sealing mechanism compresses and expands the gas by axially moving the valve stem, sealing it by the mutual fit of the leak-proof mechanism.

[0008] In gas field wellhead control devices, the internal gas is typically controlled by a throttle valve to achieve a gas seal. When the valve stem closes the throttle valve, the leak-proof mechanism inside the throttle valve will activate and begin to close. When gas leaks inside the throttle valve, the gas will quickly fill the entire cavity of the throttle valve, increasing the internal gas pressure and improving the sealing effect of the leak-proof mechanism, thus achieving a seal.

[0009] The leak-proof mechanism includes a cylinder, a shell, a movable rod, a movable module, a support ring, a fixed sleeve, a rotating block, a support column, and a rotating rod. A shell is fixedly mounted on the side of the cylinder. A movable rod is movably mounted inside the cylinder. A pushing block, which has a conical structure, is fixedly mounted on the movable rod. A valve core is located at the bottom of the movable rod. A rectangular groove is axially formed on the inner wall of the shell. An opening is radially formed at the bottom end of the rectangular groove. A movable module is slidably mounted inside the opening. A support ring is fixedly mounted inside the shell. Fixed sleeves are arranged in a circular array on the support ring. An arc-shaped groove is formed at the center of the fixed sleeve. An annular groove is formed on the outer side of the fixed sleeve with its axis as the center. A rotating block is rotatably mounted on the fixed sleeve. Fixed blocks are arranged around the support ring. The fixed blocks are fixedly connected to the shell.

[0010] An arc-shaped tooth is provided on the outer side of any one of the rotating blocks, and the arc-shaped tooth meshes with the tooth block. A cylindrical through hole is axially opened at the center of the rotating block, and the cylindrical through hole is rotatably connected to an annular groove. A rectangular platform is fixedly installed on the outer side of the rotating block. A circular hole is opened at the top of the rectangular platform, and the inside of the circular hole is fixedly connected to a support column. A rotating rod is rotatably installed on the top of the two support columns. A circular sleeve is provided at one end of the rotating rod, and the circular sleeve is rotatably connected to the top of the support column. A circular through hole is opened at the other end of the rotating rod. A connecting rod is provided between two adjacent rotating rods. A sealing plate is provided at the top of the connecting rod. A rubber sleeve is provided on the straight edge of the sealing plate, and an elastic sealing rubber sheet is provided on the arc edge of the sealing plate.

[0011] To prevent the sealing rubber rings on the throttle valve from aging and deteriorating in sealing performance after long-term use, thus avoiding the risk of gas leakage, a sealing plate is installed inside the circular shell. The sealing plate is pre-sealed by the movement of the valve stem, which triggers a moving module. This module moves the sealing plate along with the valve stem. When the throttle valve is fully closed, multiple sealing plates come into contact with each other for pre-sealing. When the throttle valve is opened, the sealing plates also open, without affecting the gas flow. Furthermore, when the throttle valve is adjusted, the conical pusher follows the valve stem, pushing the moving module and changing the opening size between the sealing plates, further assisting the throttle valve in regulating the gas flow rate.

[0012] The arc-shaped groove on the fixed sleeve is used to cooperate with the support ring to prevent the fixed sleeve from rotating on the support ring during the rotation of the sealing sheet by the rotating block on the fixed sleeve, thereby affecting the rotation angle of the sealing sheet. The arc-shaped groove is used to cooperate with the support ring, and the annular groove on the fixed sleeve is used so that the rotating block can rotate on the annular groove.

[0013] In order to ensure that the sealing strip can rotate and perform pre-sealing, the support ring needs to be supported by the fixing block so that the sealing strip does not shift during rotation, thus affecting the sealing effect.

[0014] The arc-shaped teeth mesh with the tooth blocks. The movement of the tooth blocks causes the arc-shaped teeth to rotate at a certain angle, which in turn causes the sealing sheet to rotate. The arc-shaped teeth are designed to ensure the rotation angle of the sealing sheet and prevent the rotation angle from being too large.

[0015] To ensure the sealing sheet can rotate smoothly during the rotation of the rotating block, the cylindrical through hole on the rotating block will rotate and engage with the annular groove on the fixed sleeve, allowing the rotating block to rotate on the fixed sleeve. Simultaneously, a rectangular platform is provided on the rotating block, with two circular holes connecting to the support column. Because the sealing sheet rotates around the annular support ring, and its inner and outer diameters are different, during pre-sealing, the rotating rods on the same rectangular platform will approach each other but not contact each other. When the sealing sheet opens, the rotating rods on the same rectangular platform will move away from each other, thus completing the opening and closing of the sealing sheet. The circular sleeve on the connecting rod allows the connecting rod to rotate on the support column, and allows the distance between the rotating rods on the rotating block to be adjusted according to the length of the connecting rod during the rotation of the rotating block, thereby completing the opening and closing of the sealing sheet. The circular through hole at the other end of the rotating rod will engage with the connecting rod, allowing the connecting rod to rotate within the circular through hole during rotation.

[0016] It should be noted that in order to ensure the sealing effect of the sealing strip, a rubber sleeve is required on the straight edge of the sealing strip. When the straight edges of the two sealing strips come into contact with each other, a pre-seal is achieved. Furthermore, when leakage occurs inside the throttle valve, the gas will fill the entire cavity, increasing the internal gas pressure. The sealing strip will be subjected to axial pressure, making the contact between the sealing strips even tighter, thereby improving the sealing effect and ensuring that the gas does not leak.

[0017] The moving module includes a toothed block, a connecting rod, and a sliding block. A connecting rod is fixedly installed at one end of the toothed block, and a sliding block is fixedly installed at the other end of the connecting rod. The sliding block has a cylindrical structure, and the cylindrical sliding block and the conical pushing block slide in contact with each other.

[0018] It should be noted that in order to enable the sealing piece to rotate a certain angle and at the same time perform pre-sealing as the moving rod moves, the movement of the moving module needs to be passed to trigger the movement of the sealing piece and perform pre-sealing. The moving distance of the slider on the moving module is coordinated with the rotation angle of the sealing piece to ensure that when the slider moves to the inside, the multiple sealing pieces can just contact each other and perform pre-sealing. Similarly, when the throttle valve is opened, due to the movement of the moving rod, the slider will be driven to move inward, and the moving module will also make the sealing piece return to its original position, allowing the gas to pass through, so as not to affect the gas flow and ensure the normal operation of the throttle valve.

[0019] Round pins protruding outward are provided at the bottoms of both ends of the connecting rod. The round pins are rotatably installed in the circular through holes on the rotating rod, and the round pins on the same connecting rod are respectively rotatably connected to the circular through holes on the adjacent fixed sleeves.

[0020] The sealing piece is fixedly installed on the connecting rod. As the connecting rod rotates, it drives the sealing piece to rotate, so as to bring the sealing pieces closer to perform pre-sealing. The round pins provided at the bottom are for cooperating with the circular through holes of the rotating rod, so that during the rotation of the sealing piece, the connecting rod can cooperate with the rotating rod. Through the rotation of the rotating block, the connecting rod is driven to rotate, and the force is transmitted to the next connecting rod, enabling the sealing pieces on the connecting rod to cooperate as a whole and perform sealing, preventing pollution caused by leakage of the throttle valve. At the same time, the elastic sealing rubber sheet provided on the arc edge of the sealing piece is to prevent gas from leaking from the bottom of the sealing edge during the rotation of the sealing piece. The elastic sealing rubber sheet and the rubber sleeve ensure the sealing effect of the sealing piece.

[0021] The pushing block is of a conical structure. A "convex" - shaped groove is provided on the conical pushing block. The conical structure of the pushing block is to enable the slider to be driven to move inward during the movement of the pushing block, so that the slider slides on the inverted conical surface of the pushing block. At the same time, the slider cooperates with the "convex" - shaped groove, so that during the movement of the pushing block, the slider will not slip off the inverted conical surface of the pushing block, thus affecting the movement of the sealing piece.

[0022] The sliding block is provided with a T-shaped protrusion, which is slidably connected to the "convex" shaped groove. During the sliding process of the sliding block, the sliding block will be subjected to inward or outward pressure and tensile force, causing the sliding block to move and driving the closing and opening of the sealing piece. When the moving rod moves to drive the pushing block to move and close the sealing piece, if the gas inside the throttle valve leaks, the air pressure inside above the valve core will increase, so that the sealing pieces fit tightly together and are subjected to a large force. When the throttle valve is opened later, during the axial upward movement of the pushing block, the sliding block will be pulled to move, thereby opening the sealing piece.

[0023] The auxiliary sealing mechanism includes a support block, a U-shaped groove, an airbag, a piston, a push rod and a sliding module. The support block is fixedly installed on the inner wall of the cylinder. A U-shaped groove is formed inside the support block. The airbag is fixedly installed at one end of the U-shaped groove. The piston is fixedly installed at the other end of the U-shaped groove. The push rod is fixedly installed on the top of the piston and is fixedly connected to the pushing block. The sliding module is fixedly installed on the inner wall of the circular shell.

[0024] In order to ensure better leakage prevention effect of the leakage prevention mechanism, an airbag is also provided. When the moving rod moves axially downward, the push rod can be driven to move through the thrust, so as to compress and push the gas inside the U-shaped groove into the airbag, causing the gas to inflate and expand, and then covering the inner side of the sealing piece. When leakage occurs, the airbag will be pushed by the air pressure through the sliding module onto the sealing piece, further strengthening the sealing effect of the sealing piece, thereby improving the leakage prevention efficiency of the leakage prevention mechanism.

[0025] The support block is of an arc-shaped structure. The inner side of the support block is an arc structure, and there is a clearance fit between the arc-shaped support block and the moving rod. The support block is of an arc-shaped structure to be installed inside the cylinder. Since the inner part of the cylinder is an arc surface, in order to enable the support block to be completely installed on the inner part of the cylinder, the support block can be welded to the inner wall of the cylinder to increase the bearing capacity of the support block. At the same time, the inner side of the support block is an arc structure, and there is a clearance fit between the arc-shaped support block and the moving rod. This is to ensure that during the movement of the moving rod, it will not contact the support block. Moreover, the push rod can be moved through the pushing block on the moving rod, and the U-shaped groove on the support block can be moved, so that the airbag expands and contacts the sealing piece.

[0026] The diameter of the pipe opening at the end of the U-shaped groove connected to the airbag is half the diameter of the pipe opening at the end connected to the piston. The U-shaped groove is filled with gas. It should be noted that since the axial movement distance of the moving rod is constant, and the diameter of the pipe opening at the end of the U-shaped groove connected to the airbag is half the diameter of the pipe opening at the end connected to the piston, the length of the slot at the sealing sliding connection port of the U-shaped groove and the piston is the stroke of the pushing block. This is to ensure that after the moving rod moves to the lowest end, the airbag can be just filled, so that the airbag and the sealing plate can contact each other, and at the same time, the sealing plate can also just contact and close.

[0027] The sliding module includes a fixed strip and a slider; the fixed strip is fixedly installed on the inner wall of the circular shell, and the slider is slidably installed on the fixed strip.

[0028] After the airbag is filled with gas, it can move to the sealing plate through the sliding module and come into contact with the sealing plate. This is to ensure that the airbag can always remain horizontal with the sealing plate when it moves, and can make full contact with the sealing plate, so that the airbag is subjected to pressure and moves quickly.

[0029] The fixing bar has an elongated groove, and the bottom of the slider has a rectangular protrusion that slides and engages with the elongated groove.

[0030] The slider has an internal ventilation hole and a magnetic block on its top. One end of the ventilation hole is fixedly connected to a U-shaped groove via an air pipe, and the other end of the ventilation hole is fixedly connected to an airbag. The outer surface of the airbag is provided with a magnetic rubber sheet, which attracts the magnetic block on the top of the slider. A lightweight compression spring is provided at one end of the slider.

[0031] It should be noted that after the airbag inflates, to ensure that the airbag and the slider can contact each other after inflation, a magnetic coating is applied to the airbag. The magnetic blocks on the airbag and the slider attract each other, allowing the airbag to remain horizontal and stable after inflation. The airbag remains horizontal with the sealing plate after inflation. A lightweight compression spring is installed at one end of the slider. This ensures that after the airbag deflates, the slider can be reset by compressing the spring. This ensures that the slider will move on the fixed strip under air pressure the next time the airbag inflates. The rectangular protrusion and the elongated groove slide in a sliding engagement to limit the slider's movement, ensuring the stability of the airbag's movement. This also ensures that after the airbag and the sealing plate are in close contact, the circumference of the airbag can contact the inner wall of the circular shell, increasing the sealing effect and improving the sealing performance of the leak-proof mechanism.

[0032] The beneficial effects of this invention are as follows:

[0033] 1. This invention incorporates a leak-proof mechanism inside the throttle valve. By closing and opening the throttle valve, the leak-proof mechanism pre-seals the valve without affecting gas flow, preventing gas leakage due to rubber ring aging. Simultaneously, the increased gas pressure enhances the sealing effect, thereby preventing gas leakage and improving gas sealing performance. This significantly improves the sealing effect of the gas field wellhead control device.

[0034] 2. This invention incorporates a movable module on the leak-proof mechanism. The movable module moves in coordination with the valve stem, triggering the movable module to pre-seal the leak-proof mechanism when it is closed. Furthermore, in the event of a leak, the increased gas pressure makes the leak-proof mechanism seal even more tightly, thus improving the sealing performance of the gas field wellhead control device.

[0035] 3. The present invention provides an auxiliary sealing mechanism on the cylindrical shell. Through the cooperation between the auxiliary sealing mechanism and the leak prevention mechanism, the auxiliary sealing mechanism expands by inflation and fits tightly with the leak prevention mechanism, thereby greatly improving the sealing performance of the gas field wellhead control device. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0038] Figure 2 This is a cross-sectional view of the leak-proof mechanism of the present invention;

[0039] Figure 3 This is a three-dimensional structural diagram of the leak-proof mechanism of the present invention;

[0040] Figure 4 This is a three-dimensional structural diagram of the leak-proof mechanism of the present invention without a sealing plate;

[0041] Figure 5 This is a three-dimensional structural diagram of the fixing sleeve, rotating block, support column, and rotating rod of the present invention;

[0042] Figure 6 This is a three-dimensional structural diagram of the connecting rod and sealing sheet of the present invention;

[0043] Figure 7 This is a three-dimensional structural diagram of the fixing sleeve of the present invention;

[0044] Figure 8Schematic three-dimensional structure of the rotating block and the toothed block of the present invention;

[0045] Figure 9 Schematic three-dimensional structure of the moving module of the present invention;

[0046] Figure 10 For the present invention Figure 2 Enlarged view at A;

[0047] Figure 11 For the present invention Figure 2 Enlarged view at B;

[0048] Figure 12 Cross-sectional view of the working principle of the present invention.

[0049] In the figure: 1. Controller; 2. Electric actuator; 3. Valve stem; 4. Throttle valve; 5. Air inlet; 6. Air outlet; 7. Leak prevention mechanism; 71. Cylinder; 72. Circular shell; 721. Rectangular groove; 722. Opening; 73. Moving rod; 731. Pushing block; 732. Valve core; 733. "Convex" shaped groove; 74. Moving module; 741. Toothed block; 742. Connecting rod; 743. Sliding block; 744. T-shaped protrusion; 75. Support ring; 751. Fixed block; 76. Fixed sleeve; 761. Arc-shaped groove; 762. Annular groove; 77. Rotating block; 771. Cylindrical through hole; 772. Rectangular platform; 773. Round hole; 774. Arc-shaped teeth; 78. Support column; 79. Rotating rod; 791. Connecting rod; 792. Sealing sheet; 793. Round sleeve; 794. Circular through hole; 795. Round pin; 796. Rubber sleeve; 797. Elastic sealing rubber sheet; 8. Auxiliary sealing mechanism; 81. Support block; 82. U-shaped groove; 83. Airbag; 84. Piston; 85. Push rod; 86. Sliding module; 861. Fixed strip; 862. Slider; 863. Long strip-shaped chute; 864. Rectangular protrusion; 865. Vent hole; 866. Magnet; 867. Air pipe; 868. Compression spring. Detailed implementation manners

[0050] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0051] As Figure 1 and Figure 2As shown, a gas field wellhead control device includes a controller 1, an electric actuator 2, a valve stem 3, a throttle valve 4, an inlet 5, and an outlet 6. The electric actuator 2 is fixedly installed on one side of the controller 1. The valve stem 3 is fixedly installed at the bottom of the electric actuator 2. The throttle valve 4 is fixedly installed at the bottom end of the valve stem 3. The inlet 5 is provided at the bottom end of the throttle valve 4, and the outlet 6 is provided on the side of the throttle valve 4. The device also includes a leak-proof mechanism 7 and an auxiliary sealing mechanism 8. The leak-proof mechanism 7 is fixedly installed inside the throttle valve 4. The leak-proof mechanism 7 compresses and expands the gas by axial movement of the valve stem 3, and the leak-proof mechanisms 7 are sealed together. The auxiliary sealing mechanism 8 is fixedly installed inside the throttle valve 4. The auxiliary sealing mechanism 8 compresses and expands the gas by axial movement of the valve stem 3, and the leak-proof mechanisms 7 are sealed together.

[0052] During the operation of a gas field wellhead, controller 1 typically controls electric actuator 2 to start working, which in turn moves valve stem 3. Valve stem 3 controls throttle valve 4, allowing gas to enter the throttle valve 4 through the inlet and then flow out through outlet 6. During operation, as valve stem 3 moves, it drives leak prevention mechanism 7 inside throttle valve 4. This prevents gas leakage from occurring inside throttle valve 4 during long-term use. Leak prevention mechanism 7 seals the gas inside, ensuring the safety of the gas field wellhead and improving its sealing performance.

[0053] like Figures 2 to 12 As shown, the leak-proof mechanism 7 includes a cylinder 71, a circular shell 72, a moving rod 73, a moving module 74, a support ring 75, a fixed sleeve 76, a rotating block 77, a support column 78, and a rotating rod 79. The circular shell 72 is fixedly installed on the side of the cylinder 71, and the moving rod 73 is movably installed inside the cylinder 71. A push block 731 is fixedly installed on the moving rod 73, and a valve core 732 is provided at the bottom of the moving rod 73. A rectangular groove 721 is axially formed on the inner wall of the circular shell 72, and the bottom of the rectangular groove 721... An opening 722 is radially provided at one end. A moving module 74 is slidably installed inside the opening 722. A support ring 75 is fixedly installed inside the circular shell 72. A fixing sleeve 76 is arranged in a ring array on the support ring 75. An arc groove 761 is provided at the center of the fixing sleeve 76. An annular groove 762 is provided on the outer side of the fixing sleeve 76 with the axis as the center. A rotating block 77 is rotatably installed on the fixing sleeve 76. A fixing block 751 is provided around the support ring 75. The fixing block 751 is fixedly connected to the circular shell 72.

[0054] An arc-shaped tooth 774 is provided on the outer side of any rotating block 77, and the arc-shaped tooth 774 meshes with the tooth block 741. A cylindrical through hole 771 is axially opened at the center of the rotating block 77, and the cylindrical through hole 771 is rotatably connected to the annular groove 762. A rectangular platform 772 is fixedly installed on the outer side of the rotating block 77, and a circular hole 773 is opened on the top of the rectangular platform 772. The interior of the circular hole 773 is fixedly connected to the support column 78. The tops of the two support columns 78 rotate... A rotating rod 79 is movably installed. One end of the rotating rod 79 is provided with a circular sleeve 793, which is rotatably connected to the top of the support column 78. The other end of the rotating rod 79 is provided with a circular through hole 794. A connecting rod 791 is provided between two adjacent rotating rods 79. A sealing plate 792 is provided on the top of the connecting rod 791. A rubber sleeve 796 is provided on the straight edge of the sealing plate 792, and an elastic sealing rubber sheet 797 is provided on the arc edge of the sealing plate 792.

[0055] When the gas field wellhead control device is shut down, firstly, the movement of the moving rod 73 moves the valve core 732 at the bottom of the moving rod 73, thereby sealing off the gas. During the movement, the pushing block 731 moves, which triggers the moving module 74 to start, causing the rotating block 77 to rotate on the fixed sleeve 76 and drive the support column 78 to rotate. At the same time, while the rotating rod 79 rotates, the rotating rod 79 moves inward on the support column 78, and drives the connecting rod 791 to move inward. The sealing plate 792 on the connecting rod 791 rotates towards the center and comes into contact with each other, thereby achieving a pre-sealing effect of the sealing plate 792, improving the sealing performance of the gas field wellhead, and preventing leakage caused by excessive pressure or aging of the rubber ring on the valve core 732.

[0056] The support ring 75 is inside the circular shell 72 and supports the sealing plate 792, so that the sealing plate 792 can have a supporting force during rotation. When gas leaks, the internal air pressure of the throttle valve 4 will increase, which will act on the sealing plate 792 and transfer the force to the support ring 75, thereby ensuring the sealing performance.

[0057] The arc-shaped groove 761 on the fixed sleeve 76 is used to cooperate with the support ring 75 to prevent the fixed sleeve 76 from rotating on the support ring 75 during the rotation of the sealing sheet 792 driven by the rotating block 77 on the fixed sleeve 76, thereby affecting the rotation angle of the sealing sheet 792. The cross-section of the arc-shaped groove 761 is rectangular to cooperate with the support ring 75, and the annular groove 762 on the fixed sleeve 76 is used for the rotating block 77 to rotate in the annular groove 762. As the valve stem 3 moves, the rotating block 77 will rotate in the annular groove 762 on the fixed sleeve 76, and drive the sealing sheet 792 on the rotating block 77 to rotate and seal, thereby achieving the pre-sealing of the sealing sheet 792.

[0058] To ensure the smooth rotation of the sealing plate 792 during the rotation of the rotating block 77, the cylindrical through hole 771 on the rotating block 77 will rotatably engage with the annular groove 762 on the fixed sleeve 76, allowing the rotating block 77 to rotate on the fixed sleeve 76. Simultaneously, a rectangular platform 772 needs to be provided on the rotating block 77, with two circular holes 773 connecting to the support column 78. This is because the sealing plate 792 rotates around the annular support ring 75, and its inner and outer diameters are different. When the sealing plate 792 is pre-sealed, the rotating rods 79 on the same rectangular platform 772 will approach each other but not contact each other. When the sealing plate 792 is opened, the rotating rods 79 on the same rectangular platform 772 will move away from each other, thereby completing the opening and closing of the sealing plate 792. As the sealing plate 792 rotates, the rotating block 77 will rotate in the annular groove 762 on the fixed sleeve 76. At the same time, the rotating rods 79 on the rotating block 77 will approach or move away from each other, thereby completing the closing or opening of the sealing plate 792.

[0059] As the moving rod 73 moves, it drives the sliding block 743 to move inward, which in turn drives the connecting rod 742 to move, thereby driving the toothed block 741 to move. This causes the arc-shaped tooth 774 to rotate, which in turn drives the sealing plate 792 to rotate and adjusts the sealing of the sealing plate 792. As the rotating block 77 rotates, it drives the sealing plate 792 to rotate, and at the same time, the circular sleeve 793 on the rotating rod 79 rotates on the support column 78, while the circular through hole 794 at the other end rotates on the connecting rod 791, thereby realizing the opening and closing of the sealing plate 792.

[0060] like Figure 2 , Figure 9 and Figure 10 As shown, the moving module 74 includes a toothed block 741, a connecting rod 742, and a sliding block 743. One end of the toothed block 741 is fixedly mounted with the connecting rod 742, and the other end of the connecting rod 742 is fixedly mounted with the sliding block 743. The sliding block 743 has a cylindrical structure, and the cylindrical sliding block 743 and the arc-shaped pushing block 731 slide in contact with each other.

[0061] When the moving rod 73 moves axially downward, it will drive the pushing block 731 to move. As a result, during the process of the pushing block 731 sliding inside the cylinder 71, it will come into contact with the sliding block 743 and exert a radial pulling force on the sliding block 743, causing the sliding block 743 to move inward and带动 the connecting rod 742 and the tooth block 741 to move inward, making the gear带动 the rotating block 77 to rotate, thereby带动 the sealing piece 792 to rotate and move closer to each other and stick tightly, thus achieving the pre-sealing of the sealing piece 792 and preventing gas from leaking from the throttle valve 4. When the throttle valve 4 is opened, the pushing block 731 on the moving rod 73 will move upward, and the sliding block 743 will slide on the pushing block 731, causing the sliding block 743 and the connecting rod 742 to return to their original positions, thereby opening the sealing piece 792 and allowing the gas to pass through, without affecting the outflow of the gas.

[0062] As Figures 3 to 5 shown, circular pins 795 protruding outward are provided at the bottoms of both ends of the connecting rod 791. The circular pins 795 are rotatably installed in the circular through holes 794 on the rotating rod 79, and the circular pins 795 on the same connecting rod 791 are respectively rotatably connected to the circular through holes 794 on the adjacent fixed sleeves 76.

[0063] The connecting rod 791 is set as a long strip structure to fixedly install the sealing piece 792 on the connecting rod 791. As the connecting rod 791 rotates, it带动 the sealing piece 792 to rotate, thereby pre-sealing by bringing the various sealing pieces 792 closer. The circular pins 795 provided at the bottom are for cooperating with the circular through holes 794 of the rotating rod 79, so that during the rotation of the sealing piece 792, the connecting rod 791 can cooperate with the rotating rod 79, and the rotating block 77 rotates,带动 the connecting rod 791 to rotate with the rotating block 77 as the axis, thereby带动 the entire sealing piece 792 to rotate.

[0064] As Figure 2 and Figure 12 shown, the pushing block 731 is of a conical structure. A "convex" - shaped groove 733 is formed on the conical - shaped pushing block 731. A T - shaped protrusion 744 is provided on the sliding block 743. The T - shaped protrusion 744 is slidably connected to the "convex" - shaped groove 733.

[0065] When the moving rod 73 moves axially downward, it will drive the pushing block 731 to move downward. The T-shaped protrusion 744 on the sliding block 743 will slide obliquely upward in the "convex"-shaped groove 733 on the pushing block 731, so that the sliding block 743 drives the connecting rod 742 to move, causing the sealing piece 792 to close. When the moving rod 73 moves axially upward, it will drive the pushing block 731 to move upward. The T-shaped protrusion 744 on the sliding block 743 will slide obliquely downward in the "convex"-shaped groove 733 on the pushing block 731, so that the sliding block 743 drives the connecting rod to move and drives the sealing piece 792 to slowly open.

[0066] As Figure 2 and Figure 11 shown, the auxiliary sealing mechanism 8 includes a support block 81, a U-shaped groove 82, an airbag 83, a piston 84, a push rod 85 and a sliding module 86. The support block 81 is fixedly installed on the inner wall of the cylinder 71. A U-shaped groove 82 is provided inside the support block 81. The airbag 83 is fixedly installed at one end of the U-shaped groove 82. The piston 84 is fixedly installed at the other end of the U-shaped groove 82. The push rod 85 is fixedly installed on the top of the piston 84 and is fixedly connected to the pushing block 731. The sliding module 86 is fixedly installed on the inner wall of the circular shell 72.

[0067] The support block 81 is of an arc structure. The inner side of the support block 81 is an arc structure. The arc-shaped support block 81 has a clearance fit with the moving rod 73. The pipe diameter value of the end of the U-shaped groove 82 connected to the airbag 83 is 1 / 2 of the pipe diameter value of the end connected to the piston 84. The inside of the U-shaped groove 82 is filled with gas. The length of the hole groove at the sealing sliding connection port between the U-shaped groove 82 and the piston 84 is the stroke of the pushing block 731.

[0068] When the moving rod 73 moves axially downward, it drives the pushing block 731 to move downward. During the downward movement of the pushing block 731, it will drive the push rod 85 to move. The push rod 85 drives the piston 84 to move downward in the U-shaped groove 82, so as to compress the gas inside the U-shaped groove 82 and fill it into the airbag 83, so that the airbag 83 inflates and expands. The expanded airbag 83 will cover the sealing piece 792. When there is a leak inside the throttle valve and gas is filled, the internal air pressure rises, which will compress the airbag 83 and at the same time compress the sealing piece 792, making the tightness between the sealing pieces 792 better, thus greatly improving the sealing performance of the gas field wellhead control device.

[0069] When the moving rod 73 moves upward axially, it drives the pushing block 731 to move upward. During the upward movement of the pushing block 731, it will drive the push rod 85 to move upward. The push rod 85 will then drive the piston 84 to move upward within the U-shaped groove 82, thereby drawing the gas inside the airbag 83 into the U-shaped groove 82, causing the airbag 83 to contract. The contracted airbag 83 will not affect the flow of gas from inside the round shell.

[0070] like Figure 2 , Figure 10 , Figure 11 and Figure 12 As shown, the sliding module 86 includes a fixing strip 861 and a slider 862; the fixing strip 861 is fixedly installed on the inner wall of the circular shell 72, and the slider 862 is slidably installed on the fixing strip 861.

[0071] When internal gas leaks, the gas will fill the throttle valve 4. As the gas pressure increases, it will push the airbag 83 to move axially toward the sealing plate 792. The slider 862 on the round shell 72 will slide axially outward on the fixing strip 861, and drive the airbag 83 to move, so that the airbag 83 and the sealing plate 792 come into contact and fit together. As the airbag 83 and the sealing plate 792 come into contact and fit together, the sealing performance of the leak-proof mechanism 7 is further enhanced.

[0072] like Figure 2 , Figure 10 , Figure 11 and Figure 12 As shown, the fixing strip 861 has an elongated groove 863, and the bottom of the slider 862 has a rectangular protrusion 864. The rectangular protrusion 864 and the elongated groove 863 slide in cooperation with each other.

[0073] like Figure 2 , Figure 10 , Figure 11 and Figure 12 As shown, the slider 862 has a vent hole 865 inside, and a magnetic block 866 is provided on the top of the slider 862. One end of the vent hole 865 is fixedly connected to the U-shaped groove 82 through an air pipe 867, and the other end of the vent hole 865 is fixedly connected to the air bag 83. The outer surface of the air bag 83 is provided with a magnetic rubber sheet, which is attracted to the magnetic block 866 on the top of the slider 862. A lightweight compression spring 868 is provided on one end of the slider 862.

[0074] As the moving rod 73 moves, the airbag 83 will inflate and expand. After the airbag 83 expands, the magnetic paint on the outer surface of the airbag 83 will generate an attractive magnetic force with the magnet 866 on the slider 862, causing the airbag 83 and the slider 862 to come into contact and fit together. When the internal gas leaks, the gas will fill the throttle valve 4. As the air pressure increases, it will push the airbag 83 to axially move towards the sealing piece 792. The rectangular protrusion 864 on the slider 862 will slide within the elongated chute 863 on the fixed bar 861 and drive the airbag 83 to move. At the same time, the air tube 867 will expand and contract, causing the airbag 83 and the sealing piece 792 to come into contact and fit together. As the airbag 83 comes into contact and combines with the sealing piece 792, the sealing performance of the leak prevention mechanism 7 is further enhanced.

[0075] During operation, as Figure 12 shown, during the use of the gas wellhead, the controller 1 usually needs to control the electric actuator 2 to start working, and then drive the valve stem 3 to move. The valve stem 3 will control the throttle valve 4, allowing gas to enter the throttle valve 4 from the intake hole and then flow out through the outlet 6. During use, as the valve stem 3 moves, the valve stem 3 inside the throttle valve 4 will drive the leak prevention mechanism 7 to operate. The valve stem 3 will drive the moving rod 73 to move, thereby driving the valve core 732 at the bottom of the moving rod 73 to move, so as to seal and close the gas. When the moving rod 73 moves axially downward, it will drive the pushing block 731 to move downward. The T-shaped protrusion 744 on the sliding block 743 will slide obliquely upward within the "convex"-shaped groove 733 on the pushing block 731 and apply a radial pulling force to the sliding block 743, causing the sliding block 743 to move inward and push the connecting rod 742 and the tooth block 741 to move inward. As a result, the arc-shaped tooth 774 rotates, and the arc-shaped tooth 774 rotates the rotating block 77, causing the rotating block 77 to rotate on the fixed sleeve 76 and driving the support column 78 to rotate. At the same time, while driving the rotating rod 79 to rotate, the rotating rod 79 will move inward towards the inside on the support column 7,并带动连接杆791向内侧移动,连接杆791上的密封片792向圆心转动,并相互靠拢接触,连接杆791上的密封片792随着转块77转动时,将相互靠近,并与相邻的密封片792之间相互接触,使得密封片792的直边上的橡胶套796相互接触,实现预密封,当所有的密封片792相互接触后,密封片792所组成的圆形结构的中心点将是向外凸出,并且与支撑环75的径向水平面呈15°夹紧,从而防止因气压过大,造成密封片792发生反向移动,提高了密封片792的密封效果,同时,也防止气田井口的控制装置的发生泄漏。

[0076] It should be noted that there seems to be some incomplete or unclear parts in the original text, especially in the middle part of the translation of ID=5. You may need to check and correct it according to the actual situation.Meanwhile, when the moving rod 73 moves axially downward, it drives the pushing block 731 to move downward. During the downward movement of the pushing block 731, it will drive the push rod 85 to move. The push rod 85 then drives the piston 84 to move downward within the U-shaped groove 82, thereby compressing the gas inside the U-shaped groove 82 and filling it into the airbag 83. As a result, the airbag 83 inflates and expands. The inflated airbag 83 will cover the sealing piece 792, and the magnetic coating on the outer surface of the airbag 83 will generate a magnetic force of mutual attraction with the magnet 866 on the slider 862, causing the airbag 83 to come into contact with and fit the slider 862. When the internal gas leaks, the gas will fill the throttle valve 4. As the air pressure increases, it will push the airbag 83 to move axially towards the sealing piece 792. The rectangular protrusion 864 on the slider 862 will slide within the long-strip-shaped chute 863 on the fixed strip 861 and drive the airbag 83 to move. At the same time, the air pipe 867 will stretch and contract, causing the airbag 83 to come into contact with and fit the sealing piece 792. With the contact and combination of the airbag 83 and the sealing piece 792, the sealing performance of the leak prevention mechanism 7 is further enhanced.

[0077] At the same time, it compresses the sealing piece 792, making the tightness between the sealing pieces 792 better, thus greatly improving the sealing performance of the gas field wellhead control device.

[0078] When the throttle valve 4 is opened and the moving rod 73 moves axially upward, it will drive the pushing block 731 to move upward. The T-shaped protrusion 744 on the sliding block 743 will slide obliquely downward within the "convex"-shaped groove 733 on the pushing block 731, causing the sliding block 743 and the connecting rod 742 to return to their original positions, thereby opening the sealing piece 792 and restoring it to its original position, allowing the gas to pass through and not affecting the outflow of the gas.

[0079] At the same time, when the moving rod 73 moves axially upward, it drives the pushing block 731 to move upward. During the upward movement of the pushing block 731, it will drive the push rod 85 to move upward. The push rod 85 then drives the piston 84 to move upward within the U-shaped groove 82, thereby pumping the gas inside the airbag 83 into the U-shaped groove 82, causing the airbag 83 to contract. The contracted airbag 83 will not affect the flow of gas inside the circular shell, and the slider 862 will be reset due to the elastic potential energy of the compression spring 868, causing the slider 862 to slide back to its original position on the fixed strip 861.

[0080] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas field wellhead control device, comprising a controller (1), an electric actuator (2), a valve stem (3), a throttle valve (4), an inlet (5), and an outlet (6); the electric actuator (2) is fixedly installed on one side of the controller (1), the valve stem (3) is fixedly installed at the bottom of the electric actuator (2), the throttle valve (4) is fixedly installed at the bottom end of the valve stem (3), the inlet (5) is provided at the bottom end of the throttle valve (4), and the outlet (6) is provided on the side of the throttle valve (4), characterized in that: It also includes a leak prevention mechanism (7) and an auxiliary sealing mechanism (8). The leak prevention mechanism (7) is fixedly installed inside the throttle valve (4). The leak prevention mechanism (7) moves axially through the valve stem (3) and causes the sealing plate to rotate radially and close. It is tightly sealed by the positive pressure of the gas. The auxiliary sealing mechanism (8) is fixedly installed inside the throttle valve (4). The auxiliary sealing mechanism (8) compresses and inflates the gas by moving axially through the valve stem (3). It is sealed by the leak prevention mechanism (7). The leak-proof mechanism (7) includes a cylinder (71), a circular shell (72), a moving rod (73), a moving module (74), a support ring (75), a fixed sleeve (76), a rotating block (77), a support column (78), and a rotating rod (79); the circular shell (72) is fixedly installed on the side of the cylinder (71), the moving rod (73) is movably installed inside the cylinder (71), a push block (731) is fixedly installed on the moving rod (73), a valve core (732) is provided at the bottom of the moving rod (73), and the inner wall of the circular shell (72) is axially opened. A rectangular groove (721) is provided, and an opening (722) is radially formed at the bottom end of the rectangular groove (721). A movable module (74) is slidably installed inside the opening (722). A support ring (75) is fixedly installed inside the circular shell (72). A fixing sleeve (76) is arranged in annular array on the support ring (75). An arc groove (761) is formed at the center of the fixing sleeve (76). An annular groove (762) is formed on the outer side of the fixing sleeve (76) with the axis as the center. A rotating block (77) is rotatably installed on the fixing sleeve (76). A fixing block (751) is provided around the support ring (75). An arc-shaped tooth (774) is provided on the outer side of any rotating block (77). A cylindrical through hole (771) is axially opened at the center of the rotating block (77). The cylindrical through hole (771) is rotatably connected to the annular groove (762). A rectangular platform (772) is fixedly installed on the outer side of the rotating block (77). A circular hole (773) is opened on the top of the rectangular platform (772). The interior of the circular hole (773) is fixedly connected to the support column (78). The tops of the two support columns (78) rotate. A rotating rod (79) is installed, and a circular sleeve (793) is provided at one end of the rotating rod (79). The circular sleeve (793) is rotatably connected to the top of the support column (78). A circular through hole (794) is opened at the other end of the rotating rod (79). A connecting rod (791) is provided between two adjacent rotating rods (79). A sealing plate (792) is provided at the top of the connecting rod (791). A rubber sleeve (796) is provided on the straight edge of the sealing plate (792). An elastic sealing rubber sheet (797) is provided on the arc edge of the sealing plate (792).

2. The gas field wellhead control device according to claim 1, characterized in that: The moving module (74) includes a toothed block (741), a connecting rod (742), and a sliding block (743). One end of the toothed block (741) is fixedly installed with a connecting rod (742), and the other end of the connecting rod (742) is fixedly installed with a sliding block (743). The sliding block (743) is of a cylindrical structure, and the cylindrical sliding block (743) and the conical driving block (731) are in sliding contact with each other.

3. A gas field wellhead control device according to claim 2, characterized in that: The driving block (731) is of a conical structure. A "convex"-shaped groove (733) is formed in the conical driving block (731). A T-shaped protrusion (744) is provided on the sliding block (743). The T-shaped protrusion (744) and the "convex"-shaped groove (733) are in sliding connection with each other.

4. A gas field wellhead control device according to claim 1, characterized in that: Circular pins (795) protruding outward are provided at the bottoms of both ends of the connecting rod (791). The circular pins (795) are rotatably installed in circular through holes (794) on the rotating rod (79), and the circular pins (795) on the same connecting rod (791) are respectively rotatably connected to circular through holes (794) on adjacent fixed sleeves (76).

5. A gas field wellhead control device according to claim 1, characterized in that: The auxiliary sealing mechanism (8) includes a support block (81), a U-shaped groove (82), an airbag (83), a piston (84), a push rod (85), and a sliding module (86). The support block (81) is fixedly installed on the inner wall of the cylinder (71). A U-shaped groove (82) is formed inside the support block (81). The airbag (83) is fixedly installed at one end of the U-shaped groove (82). The piston (84) is fixedly installed at the other end of the U-shaped groove (82). The push rod (85) is fixedly installed on the top of the piston (84), and the push rod (85) is fixedly connected to the driving block (731). The sliding module (8) is fixedly installed on the inner wall of the circular shell (72).

6. A gas field wellhead control device according to claim 5, characterized in that: The support block (81) is of an arc-shaped structure. The inner side of the support block (81) is of an arc structure, and there is a clearance fit between the arc-shaped support block (81) and the moving rod (73). The pipe diameter value of the end of the U-shaped groove (82) connected to the airbag (83) is 1 / 2 of the pipe diameter value of the end connected to the piston (84). The inside of the U-shaped groove (82) is filled with gas. The length of the hole groove at the sealed sliding connection port of the U-shaped groove (82) and the piston (84) is the stroke of the driving block (731).

7. A gas field wellhead control device according to claim 5, characterized in that: The sliding module (86) includes a fixed strip (861) and a slider (862). The fixed strip (861) is fixedly installed on the inner wall of the circular shell (72). The slider (862) is slidably installed on the fixed strip (861).

8. A gas field wellhead control device according to claim 7, characterized in that: A long strip-shaped sliding groove (863) is formed in the fixed strip (861). A rectangular protrusion (864) is provided at the bottom of the slider (862). The rectangular protrusion (864) and the long strip-shaped sliding groove (863) are in sliding fit with each other.

9. A gas field wellhead control device according to claim 7, characterized in that: The slider (862) has an internal ventilation hole (865) and a magnetic block (866) on the top of the slider (862). One end of the ventilation hole (865) is fixedly connected to the U-shaped groove (82) through an air pipe (867), and the other end of the ventilation hole (865) is fixedly connected to the air bag (83). The outer surface of the air bag (83) is provided with a magnetic rubber sheet, which attracts each other to the magnetic block (866) on the top of the slider (862). A lightweight compression spring (868) is provided at one end of the slider (862).

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