Pressure relief mechanism and stop valve for Christmas tree

Abstract

The utility model relates to the technical field of stop valves, in particular to a pressure relief mechanism and a stop valve for a Christmas tree, which comprise a support sleeve fixed on one side of the bottom of a valve body, an I-shaped pressure rod sleeved at one end of the support sleeve in a sliding manner, the pressure rod is connected with a spring, the spring is abutted against a movable pressure sheet, and the pressure sheet is connected with a first driving component. The other end of the supporting sleeve is provided with a pressure sensor, and one side is fixedly provided with a pressing sleeve. The other side of the valve body communicates with a pressure relief pipe, and a pressure relief block capable of being opened and closed is slidably inserted into the bottom of the pressure relief pipe and connected with a second driving assembly. A controller is installed on one side of the pressure relief pipe and electrically connected with the pressure sensor. The mechanism cooperates with an intelligent control system through mechanical linkage, and dynamic pressure sensing and automatic release are achieved. When the pressure abnormally rises, the system captures a signal in real time and opens a pressure relief channel to quickly release the pressure; after pressure relief, automatic reset sealing is achieved, manual intervention is not needed, and the protection capacity and stability are improved.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically a pressure relief mechanism and a gate valve for oil wellheads. Background Technology

[0002] The gate valve for wellheads is a core component of the wellhead production control system in oil and gas fields, typically installed on the main channel or wing manifold of the wellhead. Its core function is to drive the valve disc vertically up and down relative to the valve seat via the valve stem, thereby controlling the opening and closing of produced fluids (crude oil, natural gas, formation water, etc.) and finely regulating their flow. This valve operates for extended periods in extremely harsh wellhead environments, enduring continuous high pressure from downhole. During regulation in the closed or partially open state, the fluid enclosed within the valve cavity may experience abnormal pressure buildup due to temperature changes, thermal expansion, or external system pressure fluctuations, significantly exceeding the design operating pressure. If this internal overpressure is not promptly mitigated, it poses a serious threat to the valve's structure, easily leading to sealing failure or even catastrophic valve rupture. Therefore, to ensure the inherent safety and long-term reliable operation of the gate valve under high-pressure conditions, it is urgently necessary to integrate an effective pressure relief mechanism to actively release excess pressure within the valve cavity.

[0003] In existing technologies, conventional wellhead valve designs primarily focus on achieving reliable fluid shut-off and flow regulation. However, these valves typically lack proactive response mechanisms when faced with the aforementioned abnormal increase in internal valve chamber pressure. When the pressure inside the valve chamber accumulates to exceed the withstand limits of the valve body material, weak points (such as the valve body wall, flange connections, or valve cover sealing area) are highly susceptible to irreversible plastic deformation or sudden cracking and bursting. This structural damage not only directly leads to the destruction of the expensive valve body, causing oil and gas leaks and production interruptions, but may also induce serious wellhead safety and environmental accidents, posing a significant risk to the normal operation of upstream and downstream pipeline systems and related equipment. Utility Model Content

[0004] The purpose of this invention is to provide a pressure relief mechanism and a shut-off valve for a wellhead, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pressure relief mechanism and a shut-off valve for a tree, comprising: a support sleeve fixedly sleeved on one side of the bottom of the valve body, a pressure rod slidably sleeved on one end of the support sleeve, the pressure rod being in the shape of an "I", one end of the pressure rod being fixedly connected to one end of a spring, the other end of the spring abutting against one side of a pressure plate that can move along the axis of the support sleeve, the other side of the pressure plate being connected to a first driving component for driving the pressure plate to move along the axis of the support sleeve, a pressure sensor being fixedly installed inside the other end of the support sleeve, a pressure sleeve being provided on one side of the pressure sensor, and the pressure sleeve being fixedly installed on the pressure rod;

[0006] The other side of the bottom of the valve body is connected to the top of the pressure relief pipe. A pressure relief block that can be opened and closed is installed at the bottom of the pressure relief pipe. The pressure relief block and the pressure relief pipe are slidably connected. A second drive component for driving the opening and closing movement of the pressure relief block is connected to the bottom of the pressure relief block. A controller is fixedly installed on one side of the pressure relief pipe. The controller is electrically connected to the pressure sensor.

[0007] Preferably, the middle part of the pressure rod is slidably sleeved on the end of the support sleeve inside the valve body, one end of the pressure rod is inside the valve body, the other end of the pressure rod is slidably sleeved inside the support sleeve, and the pressure plate is slidably sleeved on the inner ring surface of the pressure sleeve.

[0008] Preferably, the first drive assembly includes a threaded rod, which is threadedly sleeved on the end of the support sleeve away from the valve body. One end of the threaded rod is fixedly connected to the pressure plate, and the other end of the threaded rod is fixedly sleeved with a handwheel.

[0009] Preferably, the second drive assembly includes a small electric cylinder, the non-output end of which is fixedly installed on one side of the U-shaped frame, and a limit frame is provided on the top of the other side of the U-shaped frame. Both the limit frame and the U-shaped frame are welded and fixed to the bottom of the valve body through a connecting plate.

[0010] Preferably, the U-shaped frame has sliding grooves on both sides inside, the limiting frame has a groove at one end, the pressure relief block has connecting ears fixedly connected at the four corners of the lower surface, and a movable frame is slidably installed inside the U-shaped frame, with the middle of the movable frame fixedly connected to the output end of the small electric cylinder.

[0011] Preferably, limiting pins are fixedly sleeved on both sides of the end of the movable frame. One end of one limiting pin is rotatably sleeved with a roller, and the other end is rotatably connected to one end of a connecting rod. The other end of the connecting rod is rotatably sleeved in the middle of a connecting pin. One end of the connecting pin is fixedly connected to one of the connecting ears, and the other end of the connecting pin is rotatably sleeved with a pulley. The pulley is slidably connected to the groove.

[0012] Preferably, one end of the limiting pin on the other side is rotatably fitted with a roller, and the other end is rotatably connected to one end of the connecting rod. The other end of the connecting rod is rotatably connected to the connecting ear on the other side through a fixing pin. The roller and the slide groove are slidably connected.

[0013] A shut-off valve for a wellhead includes the aforementioned pressure relief mechanism.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] By combining a mechanical linkage structure with an intelligent control system, a dynamic pressure sensing and automatic pressure relief safety mechanism is constructed. When the pressure inside the valve chamber rises abnormally, the mechanism can capture the overpressure signal in real time and actively trigger the opening of the pressure relief channel to quickly release excess pressure; after pressure relief, it can automatically reset the seal, requiring no manual intervention throughout the process. This not only fundamentally eliminates the risk of valve body rupture caused by pressure accumulation, but also significantly improves the valve's adaptive protection capability and long-term operational stability in high-pressure and corrosive media environments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a bottom view of the internal structure of this utility model;

[0018] Figure 3 This is a bottom view of the overall structure of this utility model;

[0019] Figure 4 This is a top view of the internal structure of this utility model.

[0020] In the diagram: 1. Support sleeve; 2. Pressure rod; 3. Spring; 4. Pressure plate; 5. Pressure sensor; 6. Pressure sleeve; 7. Pressure relief pipe; 8. Pressure relief block; 9. Controller; 10. Threaded rod; 11. Handwheel; 12. Small electric cylinder; 13. U-shaped frame; 14. Limiting frame; 15. Connecting plate; 16. Slide groove; 17. Groove; 18. Connecting ear; 19. Moving frame; 20. Limiting pin; 21. Roller; 22. Connecting rod; 23. Connecting pin; 24. Pulley; 25. Fixing pin. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] Example 1: Please refer to Figure 1 - Figure 4This utility model provides a technical solution: a pressure relief mechanism and a shut-off valve for a tree trunk, comprising: a support sleeve 1 fixedly sleeved on one side of the bottom of the valve body; a pressure rod 2 slidably sleeved on one end of the support sleeve 1; the support sleeve 1 limits the pressure rod 2, thereby facilitating its sliding within the support sleeve 1; the pressure rod 2 is I-shaped, thinner in the middle and thicker at both ends; one end of the pressure rod 2 is fixedly connected to one end of a spring 3; the spring 3 is disposed within the support sleeve 1; the other end of the spring 3 abuts against one side of a pressure plate 4 that can move along the axis of the support sleeve 1; the other side of the pressure plate 4 is connected to a first driving component for driving the pressure plate 4 to move along the axis of the support sleeve 1; the support sleeve 1... A pressure sensor 5 is fixedly installed inside the other end. A pressure sleeve 6 is provided on one side of the pressure sensor 5. The pressure sleeve 6 is fixedly installed on the pressure rod 2. The other side of the bottom of the valve body is connected to the top of the pressure relief pipe 7. The pressure relief pipe 7 is used to drain and relieve pressure of the medium. A pressure relief block 8 that can be opened and closed is installed at the bottom of the pressure relief pipe 7. The pressure relief block 8 is slidably inserted with the pressure relief pipe 7. A second drive component for driving the opening and closing movement of the pressure relief block 8 is connected to the bottom of the pressure relief block 8. A controller 9 is fixedly installed on one side of the pressure relief pipe 7. The controller 9 is electrically connected to the pressure sensor 5. The pressure received by the pressure sensor 5 will be transmitted to the controller 9, so as to facilitate the determination of whether pressure relief is required.

[0023] In use, the valve body is first connected to the external pipeline by the flanges at both ends of the valve body. Then, driven by the first drive assembly, the pressure plate 4 moves towards the pressure rod 2. During this process, the pressure plate 4 compresses the spring 3, and under the elastic force of the spring 3, it compresses the pressure rod 2, causing the pressure sleeve 6 to slide within the support sleeve 1 and move away from the pressure sensor 5 until the end of the pressure rod 2 inside the support sleeve 1 abuts against the inner wall of the support sleeve 1. By twisting the valve stem, the valve stem drives the valve core upward, thereby releasing the blockage of the medium. At this time, the medium flows within the valve body. When the internal pressure is greater than the squeezing force on the pressure rod 2, the medium in the valve body squeezes the pressure rod 2, causing the pressure rod 2 to move closer to the pressure sensor 5. This causes the pressure rod 2 to move synchronously with the pressure sleeve 6, while continuing to compress the spring 3 until the pressure sleeve 6 comes into contact with the pressure sensor 5 and squeezes the pressure sensor 5. When the pressure sensor 5 detects that the squeezing force it receives exceeds the preset value, it will transmit this signal to the controller 9. The controller 9 will control the second drive component to make the pressure relief block 8 slide out of the pressure relief pipe 7. Then, with the connection of the pressure relief pipe 7, the inside of the valve body is connected to the outside, and finally the medium is discharged to relieve pressure.

[0024] Example 2: Based on Example 1, the middle part of the pressure rod 2 is slidably sleeved on the end of the support sleeve 1 located inside the valve body. One end of the pressure rod 2 is inside the valve body, and the other end of the pressure rod 2 is slidably sleeved inside the support sleeve 1. The support sleeve 1 limits the pressure rod 2, allowing it to slide within the support sleeve 1. The pressure plate 4 is slidably sleeved on the inner ring surface of the pressure sleeve 6, and the pressure sleeve 6 limits the pressure plate 4. The first drive assembly includes a threaded rod 10, which is threadedly sleeved on the end of the support sleeve 1 away from the valve body. One end of the threaded rod 10 is fixedly connected to the pressure plate 4, and the other end of the threaded rod 10 is fixedly sleeved with a handwheel 11. By turning the handwheel 11... The handwheel 11 drives the threaded rod 10 to rotate, and the threaded rod 10 is threadedly connected to the support sleeve 1, so that the threaded rod 10 can move along its axis. Then, the pressure plate 4 driven by the threaded rod 10 slides into the pressure sleeve 6. While the pressure plate 4 is moving, it will squeeze one end of the spring 3, and the other end of the spring 3 will squeeze the pressure rod 2. The pressure rod 2 will then drive the pressure sleeve 6 to move away from the pressure sensor 5 until the pressure rod 2 is in contact with the inner end face of the support sleeve 1, so that the other end of the pressure rod 2 is fixed inside the valve body, which facilitates contact with the shut-off. The pressure sensor 5 is made of corrosion-resistant and waterproof material.

[0025] Example 3: Based on Example 2, the second drive component includes a small electric cylinder 12, which is electrically connected to the controller 9. The non-output end of the small electric cylinder 12 is fixedly installed on one side of the U-shaped frame 13. A limit frame 14 is provided on the top of the other side of the U-shaped frame 13. Both the limit frame 14 and the U-shaped frame 13 are welded and fixed to the bottom of the valve body through a connecting plate 15. The connecting plate 15 fixes and limits the limit frame 14 and the U-shaped frame 13. The U-shaped frame 13 provides fixed support for the small electric cylinder 12. The small electric cylinder 12 is made of waterproof material. Sliding grooves 16 are provided on both sides inside the U-shaped frame 13. A groove 17 is provided at one end of the limit frame 14. Connecting ears 18 are fixedly connected to the four corners of the lower surface of the pressure relief block 8. A movable frame 19 is slidably installed inside the U-shaped frame 13. The movable frame 19 is controlled by the U-shaped frame 13. The frame 19 is limited, and the middle part of the movable frame 19 is fixedly connected to the output end of the small electric cylinder 12. Limiting pins 20 are fixedly sleeved on both sides of the end of the movable frame 19. One end of one limiting pin 20 is rotatably sleeved with a roller 21, and the other end is rotatably connected to one end of the connecting rod 22. The other end of the connecting rod 22 is rotatably sleeved in the middle of the connecting pin 23. One end of the connecting pin 23 is fixedly connected to one side of the connecting ear 18. The other end of the connecting pin 23 is rotatably sleeved with a pulley 24, and the pulley 24 is slidably connected to the groove 17. On the other side, one end of the limiting pin 20 is rotatably sleeved with a roller 21, and the other end is rotatably connected to one end of the connecting rod 22. The other end of the connecting rod 22 is rotatably connected to the other side of the connecting ear 18 through a fixing pin 25. The roller 21 is slidably connected to the sliding groove 16.

[0026] In the initial state, pulley 24 slides into groove 17, the output end of small electric cylinder 12 is extended, and pressure relief block 8 is inserted into pressure relief pipe 7 to block it. During the flow of medium, when the internal pressure of the valve body is greater than the squeezing force on pressure rod 2, the medium inside the valve body squeezes pressure rod 2, causing it to move closer to pressure sensor 5. This will drive pressure sleeve 6 to abut against pressure sensor 5 and squeeze pressure sensor 5. When pressure sensor 5 detects that the squeezing force it receives exceeds a preset value, it will transmit this signal to controller 9. Controller 9 will control the output end of small electric cylinder 12 to retract, thereby pulling the moving frame 19 to move away from the pressure relief. As the pipe 7 moves in the direction of the movement, the moving frame 19 slides with the cooperation of the roller 21 and the slide groove 16. At this time, the pulley 24 slides out of the groove 17 under the limit of the groove 17. Then, under the rotational connection of the connecting rod 22 and the connecting ear 18, the connecting rod 22 indirectly drives the connecting ear 18 to move downward and away from the pressure relief pipe 7. This causes the pressure relief block 8 to slide out of the pressure relief pipe 7, releasing the blockage of the pressure relief pipe 7. Finally, the high pressure medium in the valve body is discharged from the pressure relief pipe 7, realizing the pressure relief safety protection of the valve body and avoiding damage to the valve body. After the pressure relief is completed, the output end of the small electric cylinder 12 can be extended again to seal the pressure relief block 8 in the pressure relief pipe 7 for subsequent use.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure relief mechanism, comprising a support sleeve (1) fixedly sleeved on one side of the bottom of a valve body, characterized in that: The support sleeve (1) is slidably fitted with a pressure rod (2) at one end. The pressure rod (2) is in the shape of an "I". One end of the pressure rod (2) is fixedly connected to one end of the spring (3). The other end of the spring (3) abuts against one side of the pressure plate (4) which can move along the axis of the support sleeve (1). The other side of the pressure plate (4) is connected to a first driving component for driving the pressure plate (4) to move along the axis of the support sleeve (1). A pressure sensor (5) is fixedly installed inside the other end of the support sleeve (1). A pressure sleeve (6) is provided on one side of the pressure sensor (5). The pressure sleeve (6) is fixedly installed on the pressure rod (2). The other side of the bottom of the valve body is connected to the top of the pressure relief pipe (7). A pressure relief block (8) that can be opened and closed is installed at the bottom of the pressure relief pipe (7). The pressure relief block (8) and the pressure relief pipe (7) are slidably connected. A second drive assembly for driving the opening and closing movement of the pressure relief block (8) is connected at the bottom of the pressure relief block (8). A controller (9) is fixedly installed on one side of the pressure relief pipe (7). The controller (9) is electrically connected to the pressure sensor (5).

2. The pressure relief mechanism according to claim 1, characterized in that: The middle part of the pressure rod (2) is slidably sleeved on the support sleeve (1) at one end inside the valve body, one end of the pressure rod (2) is inside the valve body, and the other end of the pressure rod (2) is slidably sleeved in the support sleeve (1). The pressure plate (4) is slidably sleeved on the inner ring surface of the pressure sleeve (6).

3. The pressure relief mechanism according to claim 2, characterized in that: The first drive assembly includes a threaded rod (10), which is threadedly sleeved on the end of the support sleeve (1) away from the valve body. One end of the threaded rod (10) is fixedly connected to the pressure plate (4), and the other end of the threaded rod (10) is fixedly sleeved with a handwheel (11).

4. The pressure relief mechanism according to claim 1, characterized in that: The second drive assembly includes a small electric cylinder (12), the non-output end of which is fixedly installed on one side of the U-shaped frame (13), and a limit frame (14) is provided on the top of the other side of the U-shaped frame (13). The limit frame (14) and the U-shaped frame (13) are both welded to the bottom of the valve body through a connecting plate (15).

5. A pressure relief mechanism according to claim 4, characterized in that: The U-shaped frame (13) has sliding grooves (16) on both sides inside, and a groove (17) is provided at one end of the limiting frame (14). Connecting ears (18) are fixedly connected to the four corners of the lower surface of the pressure relief block (8). A movable frame (19) is slidably installed inside the U-shaped frame (13). The middle part of the movable frame (19) is fixedly connected to the output end of the small electric cylinder (12).

6. A pressure relief mechanism according to claim 5, characterized in that: The movable frame (19) is fixedly fitted with limiting pins (20) on both sides of its end. One end of the limiting pin (20) is rotatably fitted with a roller (21), and the other end is rotatably connected to one end of the connecting rod (22). The other end of the connecting rod (22) is rotatably fitted in the middle of the connecting pin (23). One end of the connecting pin (23) is fixedly connected to one side of the connecting ear (18), and the other end of the connecting pin (23) is rotatably fitted with a pulley (24). The pulley (24) is slidably connected to the groove (17).

7. A pressure relief mechanism according to claim 6, characterized in that: On the other side, the limiting pin (20) has a roller (21) rotatably mounted on one end, and the other end is rotatably connected to one end of the connecting rod (22). The other end of the connecting rod (22) is rotatably connected to the connecting ear (18) on the other side through the fixing pin (25). The roller (21) and the slide groove (16) are slidably connected.

8. A shut-off valve for a wellhead, characterized in that: Includes the pressure relief mechanism described in any one of claims 1-7.

Images