Gas well production wellhead device with air pressure explosion-proof

Abstract

The present application relates to gas wellhead equipment technical field, and disclose a kind of gas pressure explosion-proof gas wellhead device, including Christmas tree, the side wall of Christmas tree is connected with input pipe, the one end of input pipe away from Christmas tree is connected with valve, along with the pressure exerted by worker on the outer wall of runner increasing, the strength of roller to rotating square bar extrusion also synchronously increases, at this time, rotating square bar is pressed to force sliding plate to move along the inner wall of groove outward, along with the pressure of rotating square bar continues to increase, while rotating disc rotates along the outer wall of fixed plate, the distance between limiting rod and rotating square bar reduces, when limiting rod rotates again to buckle plate clamping groove position, at this time, spring three, spring two will release potential energy, force limiting rod to enter the clamping groove inside of buckle plate, to limit the rotation of rotating disc, the angle of single rotation is one fifth, avoid single rotation angle too large, cause Christmas tree rupture.

Description

TECHNICAL FIELD

[0001] The present application relates to gas wellhead equipment technical field, specifically to a gas pressure explosion-proof gas wellhead device. BACKGROUND

[0002] Natural gas is usually mined through gas wells, and the mined natural gas cannot be directly used and needs to be processed for fuel, chemical raw materials or other purposes. According to different purposes of natural gas, the mined natural gas is transported to different places for corresponding processing through different paths, wherein the gas wellhead device is usually a Christmas tree. The Christmas tree is used as a wellhead control device, and its pressure relief system is usually composed of a safety valve, a blowout pipeline, a throttle valve, a wing valve and the like. When the Christmas tree is overloaded, the overpressure gas or liquid is guided to a safe area through a preset channel to avoid damage to the equipment due to overload.

[0003] Among them, the most common pressure relief way is manual blowout pipeline pressure relief. First, the manual gate valve on the wing of the Christmas tree is opened, and then the needle valve or flat plate valve at the front end of the blowout pipeline is gradually opened to control the pressure relief rate (the recommended pressure drop speed is ≤0.5MPa / min) to prevent pipeline icing or equipment vibration. However, when the above method is operated by the worker, the valve should be rotated no more than 1 / 4 turn each time, and after the rotation is completed, the pressure gauge is observed, and after the pressure gauge is stable, the valve is twisted again. In an emergency, it is difficult to guarantee the number of turns of the valve in a single twist. If the number of turns is too large, it is likely that the Christmas tree will be broken due to the too fast pressure relief speed. To solve the above problems, the following solutions are proposed. SUMMARY

[0004] To solve the above technical problems, the present application provides a gas pressure explosion-proof gas wellhead device, which comprises a Christmas tree, an input pipe connected through the side wall of the Christmas tree, a valve connected through the end of the input pipe away from the Christmas tree, and an output pipe connected through the bottom of the valve.

[0005] A fixing mechanism is fixedly connected to the side wall of the valve for limiting the angle of the worker's twisting.

[0006] A limiting mechanism is fixedly connected to the outer wall of the fixing mechanism. When the limiting mechanism drives the fixing mechanism to rotate one fifth of a circle, the limiting mechanism cooperates with the fixing mechanism to limit the rotation of the fixing mechanism.

[0007] A limiting mechanism is fixedly connected to the inner wall of the valve for limiting the rotation of the fixing mechanism when the pressure inside the valve is unstable.

[0008] When it is necessary to depressurize the wellhead, the worker rotates the limiting mechanism to drive the fixed mechanism to rotate. When the pressure inside the valve is stable, the limiting mechanism does not restrict the fixed mechanism, allowing the fixed mechanism to rotate normally and complete the depressurization process.

[0009] Preferably, the fixing mechanism includes:

[0010] The rotating mechanism includes a fixed plate fixedly connected to the side wall of the valve, a rotating disk rotatably connected to the side wall of the fixed plate, and a groove provided on the outer wall of the rotating disk;

[0011] The limiting component includes a sliding plate slidably connected to the inner wall of the groove, and a spring is fixedly connected to the side wall of the sliding plate;

[0012] In this process, the limiting mechanism of the equipment squeezes the limiting component, forcing the limiting component to move outward along the inner wall of the groove. At this time, the limiting mechanism moves outward and restricts the rotation of the rotating tissue.

[0013] Preferably, the limiting mechanism includes:

[0014] The snap-fit ​​assembly includes a sliding tube slidably connected to the inner wall of the sliding plate, and a limiting rod slidably connected to the inner wall of the sliding tube;

[0015] The rotating assembly includes a rotating column fixedly connected to the side wall of the rotating disk, a rotating frame fixedly connected to the side wall of the rotating column, and a rotating wheel fixedly connected to the side wall of the rotating column.

[0016] When pressure relief is needed, the rotating wheel will drive the rotating column to rotate, and the rotating column will drive the rotating disk to rotate along the outer wall of the fixed plate.

[0017] Preferably, the limited mechanism includes:

[0018] The limiting assembly includes a fixed ring fixedly connected to the inner wall of the valve, a rotating rod fixedly connected to the side wall of the rotating disk, the outer wall of the rotating rod being rotatably connected to the inner wall of the fixed ring, and five deep holes being provided on the side wall of the fixed ring.

[0019] Preferably, the limiting mechanism also includes:

[0020] The contact assembly includes a deep hole formed in the inner wall of the fixed ring, a partition fixedly connected to the inner wall of the deep hole, a sliding post slidably connected to the inner wall of the through hole of the partition, and a retaining plate fixedly connected to the side wall of the sliding post.

[0021] When the internal air pressure of the valve is unstable, the change in air pressure will force the sliding column to slide along the inner wall of the partition.

[0022] Preferably, the rotating mechanism further includes a snap-fit ​​plate fixedly connected to the side wall of the fixed plate;

[0023] When the rotating component rotates, it forces the sliding plate to move outward and compresses the spring to deform and accumulate potential energy. At the same time, as the sliding plate rotates, the limiting rod enters the inner wall of the groove of the buckle plate to restrict the rotation of the sliding plate.

[0024] Preferably, the limiting component further includes a second spring fixedly connected to the side wall of the sliding tube, the end of the second spring away from the sliding tube being fixedly connected to the inner wall of the sliding plate, and a rotating square rod being rotatably connected to the inner wall of the sliding plate, the end of the rotating square rod away from the sliding plate being rotatably connected to the inner wall of the sliding plate.

[0025] When the sliding plate moves outward, if the limiting rod does not reach the slot of the buckle plate, the sliding plate will compress the second spring, causing the second spring to deform.

[0026] Preferably, the buckle assembly further includes a spring three fixedly connected to the side wall of the limiting rod, with the end of the spring three away from the limiting rod fixedly connected to the inner wall of the sliding tube;

[0027] Under normal conditions, spring three will be in an outward-extended state, and after being compressed and deformed, it will accumulate potential energy. When the limiting rod coincides with the slot of the buckle plate, spring three and spring two will release potential energy, pushing the limiting rod into the slot of the buckle plate.

[0028] Preferably, the rotating assembly further includes a roller rotatably connected to the outer wall of the rotating frame, and a torsion spring is fixedly connected to the bottom of the roller;

[0029] When the rotating column rotates, it will rotate on its own axis. Then, the rotating column drives the roller to rotate through the rotating frame and squeezes the outer wall of the rotating square rod. The rotating square rod will squeeze the sliding plate, forcing the sliding plate to move outward along the inner wall of the groove.

[0030] Preferably, the limiting component further includes an annular groove on the outer wall of the rotating rod and a vertical groove on the side wall of the rotating rod, wherein the vertical groove and the annular groove are in communication with each other.

[0031] When the sliding column slides along the inner wall of the deep hole, the clamping plate will move synchronously. When the clamping plate is completely inside the annular groove, the rotating rod can rotate. When the sliding column slides due to air pressure, part of the clamping plate will enter the vertical groove, restricting the rotation of the rotating rod.

[0032] Preferably, the contact assembly further includes a piston plate fixedly connected to the side wall of the sliding column, and a spring four is fixedly connected to the side wall of the piston plate, with the end of the spring four away from the piston plate fixedly connected to the side wall of the partition.

[0033] The piston plate has several small holes on its side wall, through which gas can reach the gap between the partition and the piston plate.

[0034] The present invention has the following beneficial effects:

[0035] (1) In this invention, when the internal gas pressure of the oil well is overloaded, the operator will rotate the rotating wheel. The rotating wheel drives the rotating frame to rotate through the rotating column. The rotating frame squeezes the rotating square rod through multiple rollers, forcing the rotating square rod to press against the sliding plate. Due to the influence of the protruding blocks on the surface of the rotating square rod, the rollers experience greater resistance in the early stage of the rotating frame's rotation. At this time, the rotating frame forces the rotating square rod and the rotating disk to rotate synchronously in the same direction through the rollers. Figure 5 As shown, the limiting rod is forced into a misaligned state with the slot of the buckle plate. As the pressure applied by the worker to the outer wall of the rotating wheel increases, the force of the roller pressing on the rotating square rod also increases simultaneously. At this time, the pressure on the rotating square rod will force the sliding plate to move outward along the inner wall of the groove, while the limiting rod contacts the inner wall of the buckle plate, increasing the pressure of the rotating disk rotating on the outer wall of the fixed plate. As the pressure on the rotating square rod continues to increase, the rotating disk rotates along the outer wall of the fixed plate. As the distance between the limiting rod and the rotating square rod decreases, springs three, two, and one will be compressed and contract, accumulating potential energy. When the limiting rod rotates to the buckle plate slot position again, springs three and two will release potential energy, forcing the limiting rod into the buckle plate slot, thereby limiting the rotation of the rotating disk. When external personnel apply pressure again, the limiting rod will limit the rotation of the rotating disk. Through the application of the above components, it is ensured that the angle of each rotation is one-fifth, avoiding excessively large single rotation angles, which would lead to excessively fast depressurization and cause the oil well tree to rupture.

[0036] (2) This invention utilizes the characteristic that the internal air pressure of the valve will change suddenly after a single rotation. A limiting mechanism is set inside the equipment. When the internal air pressure of the valve changes significantly, the air pressure will act on the side wall of the piston plate, forcing the piston plate to extend and retract. When the air pressure change is not significant, the clamping plate will be completely inside the groove of the annular groove. When the external rotating disk rotates, it will drive the synchronous rotating rod of the annular groove to rotate synchronously. When the internal air pressure of the valve changes significantly, the piston plate will slide along the inner wall of the deep hole under pressure. At this time, the piston plate will force the sliding column to drive the clamping plate into the interior of the vertical groove. At this time, the clamping plate will restrict the rotation of the rotating rod. Through the application of the above components, it is ensured that when the internal air pressure of the valve changes significantly, the clamping plate will restrict the rotation of the rotating rod, avoiding depressurization again when the internal air pressure of the valve changes significantly, which would cause the rupture of the oil well tree.

[0037] (3) The present invention utilizes the characteristic that the piston plate will be forced to slide when the air pressure changes. A piston plate is provided inside the equipment. The side wall of the piston plate is provided with several small through holes. Gas can pass through the through holes. However, due to the small size of the holes, the gas flow efficiency at both ends is low. When the air pressure is stable, due to the influence of the through holes of the piston plate, both ends of the piston plate will be filled with high-pressure gas. When the air pressure inside the valve changes significantly, such as when the air pressure increases, due to the low gas flow efficiency at both ends of the piston plate, the piston plate will drive the sliding column and the clamping plate to move to the left. When the air pressure decreases, the air pressure on the left side of the piston plate will be greater than the air pressure on the right side. At this time, the piston plate will be forced to move to the right. Through the application of the above components, the equipment can accurately control the sliding of the clamping plate in the original high-pressure or low-pressure environment. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 This is an exploded view of the overall structural components of the present invention;

[0041] Figure 3 This is an exploded view of the rotating component of the present invention;

[0042] Figure 4 This is a cross-sectional schematic diagram of the fixing mechanism of the present invention;

[0043] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0044] Figure 6 This is a cross-sectional schematic diagram of the limiting component of the present invention;

[0045] Figure 7 This is a schematic diagram of the rotating component of the present invention;

[0046] Figure 8 This is a schematic diagram of the rotating square rod of the present invention;

[0047] Figure 9 This is a cross-sectional schematic diagram of the limiting component of the present invention;

[0048] Figure 10 This is a schematic cross-sectional view of the mechanism defined in this invention;

[0049] Figure 11 For the present inventionFigure 10 Enlarged diagram of point B in the middle.

[0050] The attached diagram lists the components represented by each number as follows:

[0051] In the diagram: 1. Fixed mechanism; 11. Rotating mechanism; 12. Restricting component; 13. Wellhead; 14. Input pipe; 15. Valve; 16. Output pipe; 111. Fixed plate; 112. Rotating disk; 113. Groove; 114. Snap plate; 121. Sliding plate; 122. Spring 1; 123. Spring 2; 124. Rotating square rod; 2. Restricting mechanism; 21. Snap assembly; 22. Rotating component; 211. Sliding pipe 212. Spring 3; 213. Limiting rod; 221. Rotating column; 222. Rotating frame; 223. Roller; 224. Rotating wheel; 3. Limiting mechanism; 31. Limiting component; 32. Contact component; 311. Fixing ring; 312. Rotating rod; 313. Annular groove; 314. Vertical groove; 315. Deep hole; 321. Partition plate; 322. Sliding column; 323. Clamping plate; 324. Piston plate; 325. Spring 4. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Example 1, please refer to Figures 1-5 The present invention is a gas pressure explosion-proof gas wellhead device, including a tree 13, an input pipe 14 is connected through the side wall of the tree 13, a valve 15 is connected through the end of the input pipe 14 away from the tree 13, and an output pipe 16 is connected through the bottom of the valve 15.

[0054] Fixing mechanism 1 is fixedly connected to the side wall of valve 15 to limit the angle of twisting by the worker;

[0055] The limiting mechanism 2 is fixedly connected to the outer wall of the fixed mechanism 1. When the limiting mechanism 2 drives the fixed mechanism 1 to rotate one-fifth of a turn, the limiting mechanism 2 cooperates with the fixed mechanism 1 to limit the rotation of the fixed mechanism 1.

[0056] The limiting mechanism 3 is fixedly connected to the inner wall of the valve 15 and is used to limit the rotation of the fixing mechanism 1 when the air pressure inside the valve 15 is unstable.

[0057] When it is necessary to depressurize the wellhead 13, the worker rotates the limiting mechanism 2 to drive the fixing mechanism 1 to rotate. When the internal pressure of the valve 15 is stable, the limiting mechanism 3 does not restrict the fixing mechanism 1, so that the fixing mechanism 1 can rotate normally and complete the depressurization process.

[0058] Before use, the wellhead 13 is fixed to the top of the gas well to ensure that the gas in the gas well can be transmitted upward through the wellhead 13, thus completing the basic transmission process.

[0059] Fixed mechanism 1 includes:

[0060] Rotating mechanism 11 includes a fixed plate 111 fixedly connected to the side wall of valve 15, a rotating disk 112 rotatably connected to the side wall of the fixed plate 111, and a groove 113 is provided on the outer wall of the rotating disk 112.

[0061] The limiting component 12 includes a sliding plate 121 slidably connected to the inner wall of the groove 113, and a spring 122 is fixedly connected to the side wall of the sliding plate 121.

[0062] In this process, the limiting mechanism 2 squeezes the limiting component 12, forcing the limiting component 12 to move outward along the inner wall of the groove 113. At this time, the limiting mechanism 2 moves outward and restricts the rotation of the rotating tissue 11.

[0063] Restricted agency 2 includes:

[0064] The buckle assembly 21 includes a sliding tube 211 that is slidably connected to the inner wall of the sliding plate 121, and a limiting rod 213 that is slidably connected to the inner wall of the sliding tube 211.

[0065] The rotating assembly 22 includes a rotating column 221 fixedly connected to the side wall of the rotating disk 112, a rotating frame 222 fixedly connected to the side wall of the rotating column 221, and a rotating wheel 224 fixedly connected to the side wall of the rotating column 221.

[0066] When pressure relief is required, the rotating wheel 224 will drive the rotating column 221 to rotate, and the rotating column 221 will drive the rotating disk 112 to rotate along the outer wall of the fixed plate 111.

[0067] Limited agency 3 includes:

[0068] The limiting component 31 includes a fixing ring 311 fixedly connected to the inner wall of the valve 15, a rotating rod 312 fixedly connected to the side wall of the rotating disk 112, the outer wall of the rotating rod 312 being rotatably connected to the inner wall of the fixing ring 311, and five deep holes 315 being provided on the side wall of the fixing ring 311.

[0069] Limited agency 3 also includes:

[0070] The contact assembly 32 includes a deep hole 315 formed in the inner wall of the fixing ring 311, a partition 321 fixedly connected to the inner wall of the deep hole 315, a sliding post 322 slidably connected to the inner wall of the through hole of the partition 321, and a retaining plate 323 fixedly connected to the side wall of the sliding post 322.

[0071] When the internal air pressure of valve 15 is unstable, the change in air pressure will force the sliding column 322 to slide along the inner wall of the partition 321.

[0072] Example 2, please refer to Figures 2-11 The present invention is a gas pressure explosion-proof gas wellhead device. Based on Example 1, the rotating mechanism 11 also includes a buckle plate 114 fixedly connected to the side wall of the fixing plate 111.

[0073] When the rotating assembly 22 rotates, it forces the sliding plate 121 to move outward and compresses the spring 122 to deform and accumulate potential energy. At the same time, as the sliding plate 121 rotates, the limiting rod 213 enters the inner wall of the groove of the buckle plate 114 to limit the rotation of the sliding plate 121 and the rotating disk 112.

[0074] The limiting component 12 also includes a second spring 123 fixedly connected to the side wall of the sliding tube 211. The end of the second spring 123 away from the sliding tube 211 is fixedly connected to the inner wall of the sliding plate 121. A rotating square rod 124 is rotatably connected to the inner wall of the sliding plate 121. The end of the rotating square rod 124 away from the sliding plate 121 is rotatably connected to the inner wall of the rotating disk 112.

[0075] When the sliding plate 121 moves outward, if the limiting rod 213 does not reach the slot of the buckle plate 114, the sliding plate 121 will squeeze the spring 123, causing the spring 123 to deform.

[0076] When the internal air pressure of the wellhead 13 is overloaded, the operator will rotate the rotating wheel 224. The rotating wheel 224 drives the rotating frame 222 to rotate through the rotating column 221. The rotating frame 222 squeezes the rotating square rod 124 through multiple rollers 223, forcing the rotating square rod 124 to press against the sliding plate 121. Due to the influence of the protruding block on the surface of the rotating square rod 124, the rollers 223 experience greater resistance in the early stage of the rotation of the rotating frame 222. At this time, the rotating frame 222 forces the rotating square rod 124 and the rotating disk 112 to rotate synchronously in the same direction through the rollers 223.

[0077] The buckle assembly 21 also includes a spring 212 fixedly connected to the side wall of the limiting rod 213, with one end of the spring 212 away from the limiting rod 213 fixedly connected to the inner wall of the sliding tube 211;

[0078] Under normal conditions, spring 3 212 will be in an outward-extended state, and after being compressed and deformed, it will accumulate potential energy. When the limiting rod 213 coincides with the slot of the buckle plate 114, spring 3 212 and spring 2 123 will release potential energy, pushing the limiting rod 213 into the slot of the buckle plate 114.

[0079] The rotation of the rotating disk 112 will drive the rotating rod 312 to rotate. The rotating rod 312 is fixed to the valve assembly inside the valve 15. Each time the rotating rod 312 is rotated, part of the valve assembly is closed. After the equipment completes a single rotation, the torsion spring inside the rotating column 221 will release potential energy, causing the rotating frame 222 to rotate and reset. The spring 122 also releases potential energy, forcing the sliding plate 121 to reset. At this time, the sliding plate 121 drives the limiting rod 213 away from the slot of the buckle plate 114, so that the limiting rod 213 no longer restricts the rotation of the rotating column 221.

[0080] The rotating assembly 22 also includes a roller 223 rotatably connected to the outer wall of the rotating frame 222, and a torsion spring is fixedly connected to the bottom of the roller 223;

[0081] When the rotating column 221 rotates, it will rotate on its own axis. Then, the rotating column 221 drives the roller 223 to rotate through the rotating frame 222 and presses the outer wall of the rotating square rod 124. The rotating square rod 124 will press the sliding plate 121, forcing the sliding plate 121 to move outward along the inner wall of the groove 113.

[0082] As the pressure applied by the worker to the outer wall of the rotating wheel 224 increases, the pressure exerted by the roller 223 on the rotating square rod 124 also increases simultaneously. At this point, the pressure on the rotating square rod 124 forces the sliding plate 121 to move outward along the inner wall of the groove 113, while the limiting rod 213 contacts the inner wall of the snap-fit ​​plate 114, increasing the pressure on the rotating disk 112 as it rotates on the outer wall of the fixed plate 111. As the pressure on the rotating square rod 124 continues to increase, the rotating disk 112 rotates along the outer wall of the fixed plate 111. Simultaneously, as the distance between the limiting rod 213 and the rotating square rod 124 decreases, the spring 212 and the spring... Springs 212 and 123 will contract under pressure, accumulating potential energy. When the limiting rod 213 rotates to the slot position of the buckle plate 114 again, springs 212 and 123 will release potential energy, forcing the limiting rod 213 into the slot of the buckle plate 114, thereby limiting the rotation of the rotating disk 112. When external personnel apply pressure again, the limiting rod 213 will limit the rotation of the rotating disk 112. Through the application of the above components, it is ensured that the angle of each rotation is one-fifth, avoiding excessively large single rotation angles, which would lead to excessively fast pressure release and cause the oil well tree 13 to rupture.

[0083] The limiting component 31 also includes an annular groove 313 on the outer wall of the rotating rod 312 and a vertical groove 314 on the side wall of the rotating rod 312, with the vertical groove 314 and the annular groove 313 communicating with each other.

[0084] When the sliding column 322 slides along the inner wall of the deep hole 315, the clamping plate 323 will move synchronously. When the clamping plate 323 is completely inside the annular groove 313, the rotating rod 312 can rotate. When the sliding column 322 slides due to air pressure, part of the clamping plate 323 will enter the vertical groove 314, restricting the rotation of the rotating rod 312.

[0085] Taking advantage of the sudden change in internal air pressure after a single rotation, a limiting mechanism 3 is installed inside the equipment. When the internal air pressure of valve 15 changes significantly, the air pressure acts on the side wall of piston plate 324, forcing piston plate 324 to extend or retract. When the air pressure change is small, the clamping plate 323 will be completely inside the groove of annular groove 313. At this time, when the external rotating disk 112 rotates, it will drive the annular groove 313 to rotate synchronously with the synchronous rotating rod 312. Meanwhile, the air pressure inside valve 15... When there is a significant change, the piston plate 324 will slide along the inner wall of the deep hole 315 under pressure. At this time, the piston plate 324 will force the sliding column 322 to drive the clamping plate 323 into the interior of the vertical groove 314. The clamping plate 323 will then restrict the rotation of the rotating rod 312. Through the application of the above components, when the internal air pressure of the valve 15 changes significantly, the clamping plate 323 will restrict the rotation of the rotating rod 312, thus preventing the valve 15 from depressurizing again and causing the tree 13 to rupture under the condition of a large change in internal air pressure.

[0086] The contact assembly 32 also includes a piston plate 324 fixedly connected to the side wall of the sliding column 322. A spring 325 is fixedly connected to the side wall of the piston plate 324. The end of the spring 325 away from the piston plate 324 is fixedly connected to the side wall of the partition plate 321.

[0087] Among them, the side wall of the piston plate 324 is provided with several small holes, and the gas can reach the gap between the partition plate 321 and the piston plate 324 through the holes on the piston plate 324.

[0088] Utilizing the characteristic that changes in air pressure force the piston plate 324 to slide, a piston plate 324 is installed inside the equipment. The side wall of the piston plate 324 has several small through holes through which gas can pass. However, due to the small size of the holes, the gas flow efficiency at both ends is low. When the air pressure is stable, due to the influence of the through holes in the piston plate 324, both ends of the piston plate 324 will be filled with high-pressure gas. Figure 11When the internal air pressure of valve 15 changes significantly, such as when the air pressure increases, the piston plate 324 will drive the sliding column 322 and the clamping plate 323 to move to the left due to the low gas flow efficiency at both ends of the piston plate 324. When the air pressure decreases, the air pressure on the left side of the piston plate 324 will be greater than the air pressure on the right side, which will force the piston plate 324 to move to the right. Through the application of the above components, the equipment can accurately control the sliding of the clamping plate 323 in a high-pressure or low-pressure environment.

[0089] One specific application of this embodiment is: before use, the wellhead 13 is fixed to the top of the gas well to ensure that the gas in the gas well can be transmitted upward through the wellhead 13 to complete the basic transmission process.

[0090] When the internal air pressure of the wellhead 13 is overloaded, the operator will rotate the rotating wheel 224. The rotating wheel 224 drives the rotating frame 222 to rotate via the rotating column 221. The rotating frame 222, through multiple rollers 223, presses against the rotating square rod 124, forcing the rotating square rod 124 to press against the sliding plate 121. Due to the influence of the protruding blocks on the surface of the rotating square rod 124, the rollers 223 experience greater resistance in the early stage of rotation due to the protruding blocks of the rotating square rod 124. At this time, the rotating frame 222 forces the rotating square rod 124 and the rotating disk 112 to rotate synchronously in the same direction through the rollers 223. Figure 5 As shown, the limiting rod 213 is forced into a misaligned state with the slot of the buckle plate 114. As the pressure applied by the worker to the outer wall of the rotating wheel 224 increases, the pressure exerted by the roller 223 on the rotating square rod 124 also increases simultaneously. At this time, the pressure on the rotating square rod 124 will force the sliding plate 121 to move outward along the inner wall of the groove 113, while the limiting rod 213 contacts the inner wall of the buckle plate 114, increasing the pressure of the rotating disk 112 rotating on the outer wall of the fixed plate 111. As the pressure on the rotating square rod 124 continues to increase, the rotating disk 112 rotates along the outer wall of the fixed plate 111, and the pressure between the limiting rod 213 and the rotating square rod 124 also increases. As the distance decreases, springs 212, 123, and 122 will be compressed and contract, accumulating potential energy. When the limiting rod 213 rotates back to the slot position of the latching plate 114, springs 212 and 123 will release their potential energy, forcing the limiting rod 213 into the slot of the latching plate 114, thereby limiting the rotation of the rotating disk 112. When external personnel apply pressure again, the limiting rod 213 will limit the rotation of the rotating disk 112. Through the application of the above components, it is ensured that the angle of each rotation is one-fifth, avoiding an excessively large angle of rotation, which would lead to excessively fast pressure release and cause the tree 13 to rupture.

[0091] The rotation of the rotating disk 112 will drive the rotating rod 312 to rotate. The rotating rod 312 is fixed to the valve assembly inside the valve 15. Each time the rotating rod 312 is rotated, part of the valve assembly is closed. After the equipment completes a single rotation, the torsion spring inside the rotating column 221 will release potential energy, causing the rotating frame 222 to rotate and reset. The spring 122 also releases potential energy to force the sliding plate 121 to reset. At this time, the sliding plate 121 drives the limiting rod 213 away from the slot of the buckle plate 114, so that the limiting rod 213 no longer restricts the rotation of the rotating column 221.

[0092] Taking advantage of the sudden change in internal air pressure after a single rotation, a limiting mechanism 3 is installed inside the equipment. When the internal air pressure of valve 15 changes significantly, the air pressure acts on the side wall of piston plate 324, forcing piston plate 324 to extend or retract. When the air pressure change is small, the clamping plate 323 will be completely inside the groove of annular groove 313. At this time, when the external rotating disk 112 rotates, it will drive the annular groove 313 to rotate synchronously with the synchronous rotating rod 312. Meanwhile, the air pressure inside valve 15... When there is a significant change, the piston plate 324 will slide along the inner wall of the deep hole 315 under pressure. At this time, the piston plate 324 will force the sliding column 322 to drive the clamping plate 323 into the interior of the vertical groove 314. The clamping plate 323 will then restrict the rotation of the rotating rod 312. Through the application of the above components, when the internal air pressure of the valve 15 changes significantly, the clamping plate 323 will restrict the rotation of the rotating rod 312, thus preventing the valve 15 from depressurizing again and causing the tree 13 to rupture under the condition of a large change in internal air pressure.

[0093] Utilizing the characteristic that changes in air pressure force the piston plate 324 to slide, a piston plate 324 is installed inside the equipment. The side wall of the piston plate 324 has several small through holes through which gas can pass. However, due to the small size of the holes, the gas flow efficiency at both ends is low. When the air pressure is stable, due to the influence of the through holes in the piston plate 324, both ends of the piston plate 324 will be filled with high-pressure gas. Figure 11 When the internal air pressure of valve 15 changes significantly, such as when the air pressure increases, the piston plate 324 will drive the sliding column 322 and the clamping plate 323 to move to the left due to the low gas flow efficiency at both ends of the piston plate 324. When the air pressure decreases, the air pressure on the left side of the piston plate 324 will be greater than the air pressure on the right side, which will force the piston plate 324 to move to the right. Through the application of the above components, the equipment can accurately control the sliding of the clamping plate 323 in a high-pressure or low-pressure environment.

[0094] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A gas wellhead device for gas production with explosion-proof gas pressure, comprising a tree (13), wherein an input pipe (14) is connected through the side wall of the tree (13), a valve (15) is connected through the end of the input pipe (14) away from the tree (13), and an output pipe (16) is connected through the bottom of the valve (15), characterized in that, Also includes: The fixing mechanism (1) is fixedly connected to the side wall of the valve (15) to limit the angle of the worker's twisting. The limiting mechanism (2) is fixedly connected to the outer wall of the fixing mechanism (1). When the limiting mechanism (2) drives the fixing mechanism (1) to rotate, the limiting mechanism (2) cooperates with the fixing mechanism (1) to limit the rotation of the fixing mechanism (1). The limiting mechanism (3) is fixedly connected to the inner wall of the valve (15) and is used to limit the rotation of the fixing mechanism (1) when the air pressure inside the valve (15) is unstable. The fixing mechanism (1) includes: A rotating mechanism (11) includes a fixed plate (111) fixedly connected to the side wall of the valve (15), a rotating disk (112) rotatably connected to the side wall of the fixed plate (111), and a groove (113) provided on the outer wall of the rotating disk (112); a snap-on plate (114) is fixedly connected to the side wall of the fixed plate (111); The limiting component (12) includes a sliding plate (121) slidably connected to the inner wall of the groove (113), and a spring (122) fixedly connected to the side wall of the sliding plate (121); a rotating square rod (124) is rotatably connected to the inner wall of the sliding plate (121), and one end of the rotating square rod (124) away from the sliding plate (121) is rotatably connected to the inner wall of the rotating disk (112); The limiting mechanism (2) includes: The buckle assembly (21) includes a sliding tube (211) slidably connected to the inner wall of the sliding plate (121), and a limiting rod (213) slidably connected to the inner wall of the sliding tube (211); the limiting rod (213) cooperates with the first groove of the buckle plate to limit the rotation of the rotating disk (112); The rotating assembly (22) includes a rotating column (221) fixedly connected to the side wall of the rotating disk (112), a rotating frame (222) fixedly connected to the side wall of the rotating column (221), and a rotating wheel (224) fixedly connected to the side wall of the rotating column (221); the rotating assembly (22) includes a roller (223) rotatably connected to the outer wall of the rotating frame (222), and a torsion spring fixedly connected to the bottom of the roller (223); the rotating column (221) drives the roller (223) to rotate through the rotating frame (222), and squeezes the outer wall of the rotating square rod (124), and the rotating square rod (124) squeezes the sliding plate (121), forcing the sliding plate (121) to move outward along the inner wall of the groove (113); The limiting mechanism (3) includes: The limiting component (31) includes a fixing ring (311) fixedly connected to the inner wall of the valve (15), a rotating rod (312) fixedly connected to the side wall of the rotating disk (112), the outer wall of the rotating rod (312) being rotatably connected to the inner wall of the fixing ring (311), an annular groove (313) being provided on the outer wall of the rotating rod (312), and a vertical groove (314) being provided on the side wall of the rotating rod (312), the vertical groove (314) and the annular groove (313) being interconnected; The contact assembly (32) includes a deep hole (315) opened in the fixing ring (311), a partition (321) is fixedly connected to the inner wall of the deep hole (315), a sliding column (322) is slidably connected to the inner wall of the through hole of the partition (321), and a retaining plate (323) is fixedly connected to the side wall of the sliding column (322). When the sliding column (322) slides due to air pressure, part of the clamping plate (323) will enter the vertical groove (314) to restrict the rotation of the rotating rod (312).

2. The gas pressure explosion-proof gas wellhead device according to claim 1, characterized in that: The limiting component (12) also includes a second spring (123) fixedly connected to the side wall of the sliding tube (211), and one end of the second spring (123) away from the sliding tube (211) is fixedly connected to the inner wall of the sliding plate (121); When the sliding plate (121) moves outward, if the limiting rod (213) does not reach the slot of the buckle plate (114), the sliding plate (121) will squeeze the second spring (123), causing the second spring (123) to deform.

3. The gas pressure explosion-proof gas wellhead device according to claim 2, characterized in that: The buckle assembly (21) also includes a spring three (212) fixedly connected to the side wall of the limiting rod (213), and the end of the spring three (212) away from the limiting rod (213) is fixedly connected to the inner wall of the sliding tube (211); Under normal conditions, spring three (212) will be in an outward-stretched state and will accumulate potential energy after being compressed and deformed. When the limiting rod (213) coincides with the slot of the buckle plate (114), spring three (212) will actively release the potential energy of spring two (123) and push the limiting rod (213) into the slot of the buckle plate (114).

4. The gas pressure explosion-proof gas wellhead device according to claim 3, characterized in that: The contact assembly (32) further includes a piston plate (324) fixedly connected to the side wall of the sliding column (322), and a spring four (325) fixedly connected to the side wall of the piston plate (324). The end of the spring four (325) away from the piston plate (324) is fixedly connected to the side wall of the partition plate (321). The piston plate (324) has several small holes on its side wall, through which gas can reach the gap between the partition plate (321) and the piston plate (324).

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