Safety valve with air-tight seal threads

Abstract

The utility model discloses a safety valve with air-tight seal threads. The safety valve comprises a valve body and a thread structure. The valve body comprises a spring sleeve, an upper connector and a lower connector, and the two ends of the spring sleeve are detachably connected with the upper connector and the lower connector respectively. The threaded structure comprises stepped threads, the stepped threads are sequentially formed in the upper connector, the lower connector and the spring sleeve, and the upper connector and the lower connector are in threaded fit with the two ends of the spring sleeve respectively. By arranging the stepped threads, the sealing performance is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of valve manufacturing technology, specifically to a safety valve with an air-tight thread. Background Technology

[0002] With the rapid development of my country's economy and the continuous rise in energy demand, oil exploration and development have expanded to an unprecedented scale, especially the exploitation of marine resources, which is gradually becoming a strategic focus. According to current offshore oil production regulations, all oil and gas wells with self-flowing or self-overflowing potential must be equipped with downhole safety valve systems. This measure aims to improve operational safety. When an oil platform faces a fire or other major catastrophic event, the downhole safety valve can respond immediately, automatically sealing the wellhead, effectively preventing casualties, blowouts, and marine environmental pollution; its importance is self-evident.

[0003] Currently, all offshore oil and gas wells with self-flowing capabilities in my country have been equipped with downhole safety valves, and onshore oil fields are also gradually increasing the application of safety valves to enhance the emergency response capabilities of oil and gas wells. As an advanced tool built into oil and gas wells, downhole safety valves are designed to quickly close in the event of emergencies such as fires, pipeline ruptures, and natural disasters (e.g., earthquakes, extreme ice conditions, strong typhoons), thereby curbing the risk of blowouts and ensuring the safe operation and long-term stable production of oil and gas wells. Downhole safety valves play an increasingly important role in ensuring safe production in oil and gas fields, and their strategic value cannot be ignored.

[0004] Currently, most downhole tool components (especially safety valves) rely on rubber seals for sealing. However, downhole safety valves need to operate underground for extended periods. If rubber seals are used, they are prone to aging and failure due to the complex conditions underground. A utility model patent with publication number CN206299853U discloses a safety valve that enhances sealing by using two rubber gaskets (one and two). However, with prolonged use, this design is susceptible to deterioration and even failure of the sealing performance. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a safety valve with an air-tight thread to solve the technical problem that the seal of the safety valve is prone to failure under long-term use in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a safety valve with an airtight thread, including a valve body and a threaded structure; the valve body includes a spring sleeve, an upper connector and a lower connector, and the two ends of the spring sleeve are detachably connected to the upper connector and the lower connector respectively; the threaded structure includes a stepped thread, which is sequentially formed on the upper connector, the lower connector and the spring sleeve, such that the upper connector and the lower connector are threadedly engaged with the two ends of the spring sleeve respectively.

[0008] In some embodiments, the threaded structure further includes an inner sealing surface and an outer sealing surface. The inner sealing surface is located on the outer side of the upper connector and the lower connector, and the outer sealing surface is located on the inner side of the spring sleeve. The outer sealing surface is used to abut against the inner sealing surface and cooperate with the stepped thread to form an interference fit.

[0009] In some embodiments, the stepped thread includes an external trapezoidal thread and an internal trapezoidal thread. The external trapezoidal thread is located on the outside of the upper connector, and the internal trapezoidal thread is located on the inside of the spring sleeve. The external trapezoidal thread and the internal trapezoidal thread mate with each other.

[0010] In some embodiments, both the external trapezoidal thread and the internal trapezoidal thread are synchronous threads.

[0011] In some embodiments, both the external trapezoidal thread and the internal trapezoidal thread are configured as off-trapezoidal.

[0012] In some embodiments, the upper connector and the lower connector are provided with an outer inclined step surface on their outer sides, and the spring sleeve is provided with an inner inclined step surface on its inner side. The outer inclined step surface and the inner inclined step surface cooperate with each other and are used for limiting.

[0013] In some embodiments, both the outer inclined step surface and the inner inclined step surface are conical sealing surfaces.

[0014] In some embodiments, the inclination angles of the outer inclined step surface and the inner inclined step surface are both 76°.

[0015] In some embodiments, a piston mechanism is also included, which is mounted within the upper connector.

[0016] In some embodiments, the spring sleeve may further include a flow tube, a compression spring, and a torsion spring, which are sequentially installed within the spring sleeve.

[0017] Compared with the prior art, the safety valve with air-tight thread provided by this utility model, by setting stepped threads and sequentially opening the stepped threads on the upper connector, lower connector and spring sleeve, and making the upper connector and lower connector respectively engage with the threads at both ends of the spring sleeve, a tighter sealing surface is constructed, which effectively improves the sealing effect. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the internal structure of a safety valve with an air-tight thread provided in an embodiment of this utility model;

[0019] Figure 2 yes Figure 1 Enlarged structural diagram of stepped thread Figure 1 ;

[0020] Figure 3 yes Figure 1 Enlarged structural diagram of stepped thread Figure 2 .

[0021] Explanation of reference numerals in the attached figures:

[0022] 100. Valve body; 110. Spring sleeve; 120. Upper connector; 130. Lower connector; 140. Flow tube; 150. Compression spring; 160. Torsion spring; 170. Valve plate; 200. Threaded structure; 210. Stepped thread; 211. External trapezoidal thread; 212. Internal trapezoidal thread; 220. Internal sealing surface; 230. External sealing surface; 300. External inclined step surface; 400. Internal inclined step surface; 500. Piston mechanism. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] To address the technical problem of decreased sealing performance of rubber components during long-term use, this invention provides a safety valve with an air-tight thread, which can effectively improve sealing performance and stability during long-term use.

[0025] It should be noted that the safety valve with air-tight thread described in this utility model is used in, but not limited to, safety valves, etc. For ease of explanation, this utility model only uses the application of a safety valve with air-tight thread in downhole equipment as an example for illustration. The principle of applying a safety valve with air-tight thread to other types of equipment is essentially the same as that applied to downhole equipment, and will not be described in detail here.

[0026] Please see Figure 1 - Figure 3 , Figure 1This is a cross-sectional view of the internal structure of a safety valve with an airtight thread according to an embodiment of the present invention, including a valve body 100 and a threaded structure 200; the valve body 100 includes a spring sleeve 110, an upper connector 120 and a lower connector 130, the two ends of the spring sleeve 110 being detachably connected to the upper connector 120 and the lower connector 130 respectively; the threaded structure 200 includes a stepped thread 210, the stepped thread 210 being sequentially formed on the upper connector 120, the lower connector 130 and the spring sleeve 110, such that the upper connector 120 and the lower connector 130 are threadedly engaged with the two ends of the spring sleeve 110 respectively.

[0027] In this embodiment, by setting a stepped thread 210 and applying it to the upper connector 120, lower connector 130, and spring sleeve 110, a tighter sealing surface is formed, effectively improving the sealing effect. It is worth mentioning that the metal-to-metal sealing enhances the long-term sealing performance of the safety valve.

[0028] In one embodiment, please refer to Figure 1 - Figure 3 The threaded structure 200 also includes an inner sealing surface 220 and an outer sealing surface 230. The inner sealing surface 220 is located on the outside of the upper connector 120 and the lower connector 130, and the outer sealing surface 230 is located on the inside of the spring sleeve 110. The outer sealing surface 230 is used to abut against the inner sealing surface 220 and to cooperate with the stepped thread 210 to form an interference fit.

[0029] In this embodiment, the outer sealing surface 230 is used to abut against the inner sealing surface 220 and cooperate with the stepped thread 210 to form an interference fit, which can further achieve 100% sealing between metal surfaces and further improve the sealing effect.

[0030] In one embodiment, please refer to Figure 1 - Figure 3 The stepped thread 210 includes an external trapezoidal thread 211 and an internal trapezoidal thread 212. The external trapezoidal thread 211 is located on the outside of the upper connector 120, and the internal trapezoidal thread 212 is located on the inside of the spring sleeve 110. The external trapezoidal thread 211 and the internal trapezoidal thread 212 are engaged.

[0031] In one embodiment, please refer to Figure 1 - Figure 3 Both the external trapezoidal thread 211 and the internal trapezoidal thread 212 are synchronous threads.

[0032] In this embodiment, the thread ends of the external trapezoidal thread 211 and the internal trapezoidal thread 212 are in the same phase, which facilitates simultaneous threading and effectively ensures the load-bearing capacity after threading.

[0033] In one embodiment, please refer to Figure 1 - Figure 3Both the external trapezoidal thread 211 and the internal trapezoidal thread 212 are set as off-trapezoidal.

[0034] In this embodiment, both the external trapezoidal thread 211 and the internal trapezoidal thread 212 are set in an off-trapezoidal shape, which helps to improve the ability to withstand axial tensile loads and compressive loads.

[0035] In one embodiment, please refer to Figure 1 - Figure 3 The upper connector 120 and the lower connector 130 are provided with an outer inclined step surface 300 on the outside, and the spring sleeve 110 is provided with an inner inclined step surface 400 on the inside. The outer inclined step surface 300 and the inner inclined step surface 400 cooperate and are used to limit the movement.

[0036] In this embodiment, the outer inclined step surface 300 and the inner inclined step surface 400 cooperate and are used for limiting, which can effectively prevent plastic deformation between the inner sealing surface 220 and the outer sealing surface 230, thereby forming a double seal.

[0037] In one embodiment, please refer to Figure 1 - Figure 3 Both the outer inclined step surface 300 and the inner inclined step surface 400 are conical sealing surfaces.

[0038] In this embodiment, the outer inclined step surface 300 and the inner inclined step surface 400 can act as a limit to prevent plastic deformation and subsequent seal failure when bearing torque, and can also transmit compressive loads, reduce excessive force transmitted to the sealing surface, and reduce the risk of component damage.

[0039] In one embodiment, please refer to Figure 1 - Figure 3 The inclination angles of both the outer inclined step surface 300 and the inner inclined step surface 400 are 76°.

[0040] In this embodiment, the 76° angle setting is to avoid excessive deformation during the tightening torque process due to an excessively small angle, which would prevent the torque from being effectively maintained and could cause the threads to loosen due to transportation bumps and product vibrations.

[0041] In one embodiment, please refer to Figure 1 - Figure 3 It also includes a piston mechanism 500, which is installed inside the upper connector 120.

[0042] In one embodiment, please refer to Figure 1 - Figure 3 It also includes a flow tube 140, a compression spring 150, and a torsion spring 160, which are sequentially installed inside the spring sleeve 110.

[0043] To better understand this utility model, the following is combined with... Figures 1 to 3The technical solution of this utility model is described in detail below:

[0044] First, as a common type of automatic valve, the safety valve has various components. The upper connector 120 contains a piston mechanism 500, which can be moved to the right by applying high pressure. The piston mechanism 500 then pushes the flow tube 140, compressing the compression spring 150. As the flow tube 140 moves to the right, it pushes the valve plate 170. Figure 1 (As indicated in the diagram), opening it will cause the torsion spring 160 to twist. When the pressure decreases, the thrust applied to the piston mechanism 500 decreases, at which point the compression spring 150 will rebound, pushing the flow tube 140 to the left. When the flow tube 140 returns to its original position, the torsion spring 160 will also rebound, twisting the valve plate 170 back to its original position. During use, the safety valve, due to the stepped thread 210, the inner sealing surface 220, and the outer sealing surface 230, and through 100% metal-to-metal sealing, effectively improves the overall sealing effect, allowing for repeated disassembly and reuse, and effectively improving the long-term stability of the seal.

[0045] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A safety valve with a gas-tight seal thread, characterized in that The valve body comprises a spring sleeve, an upper joint and a lower joint, the spring sleeve is detachably connected with the upper joint and the lower joint at both ends respectively; and The thread structure comprises stepped threads, which are sequentially arranged on the upper joint, the lower joint and the spring sleeve, and make the upper joint and the lower joint threadedly cooperate with both ends of the spring sleeve respectively. The thread structure further comprises an inner sealing surface and an outer sealing surface, the inner sealing surface is arranged on the outer side of the upper joint and the lower joint, and the outer sealing surface is arranged on the inner side of the spring sleeve, the outer sealing surface is used to abut against the inner sealing surface and cooperate with the stepped threads to form an interference fit.

2. A safety valve with a gas seal thread according to claim 1, characterized in that The stepped threads comprise outer trapezoidal threads and inner trapezoidal threads, the outer trapezoidal threads are arranged on the outer side of the upper joint, and the inner trapezoidal threads are arranged on the inner side of the spring sleeve, the outer trapezoidal threads cooperate with the inner trapezoidal threads.

3. A safety valve with a gas seal thread according to claim 1, characterized in that, The outer trapezoidal threads and the inner trapezoidal threads are synchronous threads.

4. A safety valve with a gas seal thread according to claim 3, characterized in that The outer trapezoidal threads and the inner trapezoidal threads are arranged in the form of partial trapezoids.

5. A safety valve with a gas seal thread according to claim 4, characterized in that The outer side of the upper joint and the lower joint is provided with an outer inclined step surface, and the inner side of the spring sleeve is provided with an inner inclined step surface, the outer inclined step surface cooperates with the inner inclined step surface and is used to limit.

6. A safety valve with a gas seal thread according to claim 1, characterized in that, The outer inclined step surface and the inner inclined step surface are both conical sealing surfaces.

7. A safety valve with a gas seal thread according to claim 6, characterized in that The inclination angles of the outer inclined step surface and the inner inclined step surface are both 76°.

8. A safety valve with a gas seal thread according to claim 6, characterized in that The piston mechanism is further arranged in the upper joint.

9. A safety valve with a gas seal thread according to claim 1, characterized in that, The flow pipe, the compression spring and the torsion spring are sequentially arranged in the spring sleeve.

10. A safety valve with a gas seal thread according to claim 1, characterized in that ​

Images