Fracturing gas wellhead valve with self-sealing structure

Abstract

The utility model relates to valve technical field, and disclose a fracturing gas production wellhead valve of self -sealing structure, including valve body, be provided with hand wheel on the valve body, install a plurality of the round array's plug rod on the hand wheel, two bearings are fixedly connected on the valve body, the height adjusting mechanism is fixedly connected on the bearing, the connecting rod is fixedly connected on the height adjusting mechanism, the inside installation of connecting rod has telescopic subassembly, the front end fixed connection of telescopic subassembly has a circular ring. The fracturing gas production wellhead valve of self -sealing structure in the utility model, through setting up the plug rod of round array on the hand wheel, and cooperate the bearing on the valve body, height adjusting mechanism, telescopic subassembly and circular ring constitute the limiting system, when the valve plate has the tendency of rotation under pressure, telescopic subassembly pushes circular ring to form effective limiting to plug rod, offsets the unexpected rotation of hand wheel, avoids the precision of sealing surface to be destroyed, has improved the sealing stability of valve body significantly.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a fracturing gas wellhead valve with a self-sealing structure. Background Technology

[0002] As the core control component of fluid transport systems, valves are crucial to the safety and economy of industrial production. The zero-leakage characteristic of shut-off valves makes them indispensable key equipment under special working conditions.

[0003] The core defect of existing self-sealing fracturing gas wellhead valves stems from the mechanical instability of the threaded rotation connection between the valve stem and the valve plate under high-pressure dynamic conditions. The unexpected rotation of the valve stem caused by this leads to the failure of the seal surface, resulting in seal failure and multiple safety and efficiency problems. Improvements are urgently needed in terms of connection structure optimization and sealing surface design upgrades. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a fracturing gas wellhead valve with a self-sealing structure, which can counteract unexpected rotation of the handwheel, prevent damage to the precise fit of the sealing surface, and improve the sealing stability of the valve body.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a self-sealing fracturing gas wellhead valve, comprising a valve body, a handwheel on the valve body, a plurality of rods arranged in a circular array on the handwheel, two bearings fixedly connected to the valve body, a height adjustment mechanism fixedly connected to the bearings, a connecting rod fixedly connected to the height adjustment mechanism, a telescopic component installed inside the connecting rod, and a ring fixedly connected to the front end of the telescopic component.

[0006] Furthermore, the height adjustment mechanism includes an outer rod fixedly connected to the bearing, a sliding cavity is provided inside the outer rod, a spring is fixedly connected to the inner wall of the sliding cavity, an inner rod is fixedly connected to the output end of the spring, the inner rod is slidably connected to the sliding cavity, and a connecting rod is fixedly connected to the upper end of the inner rod.

[0007] Furthermore, the telescopic assembly includes a second sliding cavity inside the connecting rod, a sliding plate slidably connected inside the second sliding cavity, a threaded hole first inside the sliding plate, a threaded rod first rotatably connected to the connecting rod that matches the threaded hole first, a turntable fixedly connected to the front end of the threaded rod first, and a ring fixedly connected to the front end of the sliding plate.

[0008] Furthermore, the lower surface of the handwheel is provided with several threaded holes, and the insertion rod is threadedly connected to the threaded holes via the threaded rod.

[0009] Furthermore, the lower end of the insertion rod is provided with a rounded corner.

[0010] Furthermore, a vertical rod is fixedly connected to one side of the bearing, a limiting plate is fixedly connected to the vertical rod, a cover plate is threaded to the upper end of the vertical rod, and a baffle is sleeved on the vertical rod, with the baffle located between the limiting plate and the cover plate.

[0011] Furthermore, an anti-slip and wear-resistant pad is fixedly connected to the lower surface of the baffle.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This type of self-sealing fracturing gas wellhead valve uses a circular array of insert rods on the handwheel, along with bearings, height adjustment mechanism, telescopic assembly, and ring on the valve body to form a limiting system. When the valve plate is under pressure and tends to rotate, the telescopic assembly pushes the ring to effectively limit the insert rods, counteracting the unexpected rotation of the handwheel, preventing damage to the precise fit of the sealing surface, and significantly improving the sealing stability of the valve body. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the entire utility model; Figure 2 This is an exploded view of the entire utility model; Figure 3 This is a partial cross-sectional three-dimensional structural schematic diagram of the present invention; Figure 4 for Figure 3 Enlarged view of point A above.

[0014] In the diagram: 1. Valve body; 2. Handwheel; 3. Insert rod; 4. Bearing; 5. Connecting rod; 6. Ring; 7. Outer rod; 8. Slide cavity one; 9. Spring; 10. Inner rod; 11. Slide cavity two; 12. Slide plate; 13. Threaded hole one; 14. Threaded rod one; 15. Threaded hole two; 16. Threaded rod two; 17. Vertical rod; 18. Limiting plate; 19. Cover plate; 20. Baffle; 21. Anti-slip and wear-resistant pad. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] Please see Figures 1 to 4 A self-sealing fracturing gas wellhead valve includes a valve body 1, a handwheel 2 on the valve body 1, a plurality of insert rods 3 arranged in a circular array on the handwheel 2, two bearings 4 fixedly connected to the valve body 1, a height adjustment mechanism fixedly connected to the bearings 4, a connecting rod 5 fixedly connected to the height adjustment mechanism, a telescopic component installed inside the connecting rod 5, and a ring 6 fixedly connected to the front end of the telescopic component.

[0017] In this utility model, the self-sealing structure of the fracturing gas wellhead valve allows for the rotation of the height adjustment mechanism via the bearing 4 after the handwheel 2 has been turned. This aligns the connecting rod 5 with one of the insert rods 3. The length of the telescopic assembly is then adjusted so that the ring 6 is directly below the insert rod 3. The height of the connecting rod 5 can be adjusted by changing the length of the height adjustment mechanism. As the connecting rod 5 moves upward, the insert rod 3 gradually inserts into the ring 6. During this process, the length of the telescopic assembly can also be finely adjusted to facilitate the matching between the ring 6 and the insert rod 3. Once connected, the length of the telescopic assembly is fixed. When the valve plate rotates under pressure, the ring 6 is fitted onto the insert rod 3. The telescopic assembly and the height adjustment mechanism form a rigid limit, preventing the handwheel 2 from rotating unintended and thus counteracting the force on the valve plate, further ensuring the sealing of the valve body 1.

[0018] like Figure 4 As shown, the height adjustment mechanism includes an outer rod 7 fixedly connected to the bearing 4, a sliding cavity 8 is provided inside the outer rod 7, a spring 9 is fixedly connected to the inner wall of the sliding cavity 8, an inner rod 10 is fixedly connected to the output end of the spring 9, the inner rod 10 is slidably connected to the sliding cavity 8, and a connecting rod 5 is fixedly connected to the upper end of the inner rod 10.

[0019] Specifically, when it is necessary to turn the handwheel 2, the connecting rod 5 can be pressed directly, so that the inner rod 10 moves downward along the slide cavity 8. The spring 9 is compressed and stores energy until the ring 6 disengages from the insert rod 3. Similarly, when the ring 6 limits the insert rod 3, the spring 9 keeps the connecting rod 5 in a high position, so that the ring 6 will not descend on its own.

[0020] like Figure 4 As shown, the telescopic assembly includes a second sliding cavity 11 opened inside the connecting rod 5. A sliding plate 12 is slidably connected inside the second sliding cavity 11. A threaded hole 13 is opened inside the sliding plate 12. A threaded rod 14 matching the threaded hole 13 is rotatably connected to the connecting rod 5. A turntable is fixedly connected to the front end of the threaded rod 14. A ring 6 is fixedly connected to the front end of the sliding plate 12.

[0021] Specifically, when fitting the ring 6 onto the outside of the insert rod 3, the connecting rod 5 should first be aligned with the insert rod 3, and then the threaded rod 14 should be rotated so that the slide plate 12 moves along the direction of the sliding cavity 11 until the ring 6 is moved directly below the insert rod 3, with the center of the ring aligned with the center of the ring. At this point, the connecting rod 5 is released, and the spring 9 releases energy to push the inner rod 10 and the connecting rod 5 upward, so that the ring 6 is fitted onto the insert rod 3. During this process, the position of the ring 6 can be adjusted by rotating the threaded rod 14.

[0022] like Figure 2As shown, the lower surface of the handwheel 2 is provided with several threaded holes 15, and the insertion rod 3 is threadedly connected to the threaded holes 15 through the threaded rod 16.

[0023] Specifically, the insertion rod 3 is threadedly connected to the threaded hole 15 via the threaded rod 16, allowing the insertion rod 3 to be directly removed from the handwheel 2 without being affected by the ring 6.

[0024] like Figure 2 and Figure 4 As shown, the lower end of the insertion rod 3 is provided with a rounded corner.

[0025] Specifically, the rounded corners make it easier to insert the rod 3 into the ring 6.

[0026] like Figure 4 As shown, a vertical rod 17 is fixedly connected to one side of the bearing 4, a limiting plate 18 is fixedly connected to the vertical rod 17, a cover plate 19 is threadedly connected to the upper end of the vertical rod 17, and a baffle 20 is sleeved on the vertical rod 17, with the baffle 20 located between the limiting plate 18 and the cover plate 19.

[0027] Specifically, when it is necessary to turn the handwheel 2 to adjust the valve plate, the connecting rod 5 can be pressed to make the ring 6 move downward and disengage from the insert rod 3 until the inner rod 10 is fully retracted into the slide cavity 8. Then, the baffle 20 is rotated so that the baffle 20 is above the connecting rod 5, thereby restricting the connecting rod 5 and preventing it from moving upward. This allows the handwheel 2 to be turned normally without the need for the operator to continuously press the connecting rod 5.

[0028] like Figure 4 As shown, an anti-slip and wear-resistant pad 21 is fixedly connected to the lower surface of the baffle 20.

[0029] Specifically, the anti-slip and wear-resistant pad 21 can increase the friction between the baffle 20 and the connecting rod 5, so that the baffle 20 will not rotate easily.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-sealing wellhead valve for fracturing gas production, comprising a valve body (1) and a handwheel (2) provided on the valve body (1), characterized in that: The handwheel (2) is equipped with several rods (3) arranged in a circular array. Two bearings (4) are fixedly connected to the valve body (1). A height adjustment mechanism is fixedly connected to the bearings (4). A connecting rod (5) is fixedly connected to the height adjustment mechanism. A telescopic component is installed inside the connecting rod (5). A ring (6) is fixedly connected to the front end of the telescopic component.

2. The self-sealing wellhead valve for fracturing gas production according to claim 1, characterized in that: The height adjustment mechanism includes an outer rod (7) fixedly connected to a bearing (4), a sliding cavity (8) is provided inside the outer rod (7), a spring (9) is fixedly connected to the inner wall of the sliding cavity (8), an inner rod (10) is fixedly connected to the output end of the spring (9), the inner rod (10) is slidably connected to the sliding cavity (8), and a connecting rod (5) is fixedly connected to the upper end of the inner rod (10).

3. The self-sealing wellhead valve for fracturing gas production according to claim 2, characterized in that: The telescopic assembly includes a second sliding cavity (11) inside the connecting rod (5), a sliding plate (12) is slidably connected inside the second sliding cavity (11), a threaded hole (13) is opened inside the sliding plate (12), a threaded rod (14) matching the threaded hole (13) is rotatably connected to the connecting rod (5), a turntable is fixedly connected to the front end of the threaded rod (14), and a ring (6) is fixedly connected to the front end of the sliding plate (12).

4. The self-sealing wellhead valve for fracturing gas production according to claim 1, characterized in that: The lower surface of the handwheel (2) is provided with several threaded holes (15), and the insert rod (3) is threadedly connected to the threaded holes (15) through the threaded rod (16).

5. The self-sealing wellhead valve for fracturing gas production according to claim 4, characterized in that: The lower end of the insertion rod (3) is provided with a rounded corner.

6. The self-sealing wellhead valve for fracturing gas production according to claim 1, characterized in that: A vertical rod (17) is fixedly connected to one side of the bearing (4), a limiting plate (18) is fixedly connected to the vertical rod (17), a cover plate (19) is threaded to the upper end of the vertical rod (17), and a baffle (20) is sleeved on the vertical rod (17). The baffle (20) is located between the limiting plate (18) and the cover plate (19).

7. The self-sealing wellhead valve for fracturing gas production according to claim 6, characterized in that: The lower surface of the baffle (20) is fixedly connected with an anti-slip and wear-resistant pad (21).

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