Safety valve maintenance device

Abstract

The utility model relates to a safety valve maintenance device, in particular to a ground hydraulic safety valve maintenance device. The safety valve maintenance device comprises a cylinder cover disassembling and assembling assembly and a hydraulic cylinder taking and replacing assembly, the cylinder cover disassembling and assembling assembly comprises a clamping ring, the clamping ring is provided with a rotation stopping connecting structure used for being assembled with a cylinder cover in a rotation stopping mode and further provided with a screwing operation structure, and the hydraulic cylinder taking and replacing assembly comprises a threaded ring. A ring body of the threaded ring is provided with an external thread section matched with an internal thread at the end of the executing mechanism, a threaded ejector rod is further installed at the position, axially corresponding to the spring flange, of the threaded ring, and an inner hole of the threaded ring forms a channel for assembling and disassembling the hydraulic cylinder. The safety valve maintenance device avoids the consequences that the valve rod is bent and the actuating mechanism is damaged due to the fact that the thrust of a spring cannot be released and the operation process of a crane is unstable in the process of replacing the actuating mechanism in the safety valve maintenance process, and improves the defects that the whole valve maintenance construction period is long, the investment of equipment and personnel is large, and the maintenance cost is low. And the construction safety risk is high.

Description

Technical Field

[0001] The utility model relates to a safety valve maintenance device, in particular to a ground hydraulic safety valve maintenance device. Background Art

[0002] The ground safety valve is an important part of the gas well. In case of leakage, overpressure, fire and other emergencies, the ground safety valve can be used to shut down the well locally or remotely to ensure the safety of the gas well and gas gathering station and avoid accidents. Figure 1 , Figure 2 As shown, it includes a ground safety valve 8 and an actuator 7. The actuator 7 includes a middle rod 710, an outer spring 708, an inner spring 709, a spring flange 707, a hydraulic cylinder 703, a piston 702, and a cylinder cover 701. The hydraulic cylinder includes a hexagonal screw 706, a screw cap 705, and a rising rod 704. During use, the observation window cover 711 is first removed to record the position of the spring flange 707. The hydraulic oil enters the piston 702 and the hydraulic cylinder 703 connected to the rising rod 704. The piston 702 does not move under the restriction of the cylinder cover 701. The hydraulic cylinder 703 is driven downward by the hydraulic oil to drive the middle rod 710, the valve stem and the valve plate to open the valve. At the same time, the hydraulic cylinder will compress the two springs to store the kinetic energy required to close the valve. When closing the valve, high-pressure hydraulic oil is released, and the spring flange 707 rebounds to the recorded position under the thrust of the spring. The movement of the spring flange drives the cylinder 703 to move. The hexagonal screw 706 in the cylinder 703 drives the middle rod 710, the valve stem and the valve plate to close the valve under the restriction of the screw cap 705, and finally installs the observation window cover 711. However, in the production process, various faults of the ground safety valve may cause the gas well to be shut down unexpectedly or fail to shut down the well in time and effectively, seriously affecting the normal production of the gas well.

[0003] At present, the troubleshooting of safety valves adopts the method of replacing the actuator or the entire safety valve, which generally has the problems of difficulty in overall replacement, long maintenance cycle, high risk, and high replacement cost. If the method of replacing the actuator is adopted, because the actuator is assembled in the factory workshop with special tooling, there may be serious consequences such as valve stem bending and actuator damage caused by factors such as failure to release spring thrust and instability during crane operation during on-site replacement. If the method of replacing the entire safety valve is adopted, the split gas production tree can be replaced by replacing the entire valve, but the production process and spraying process above the main valve and the two wings must be removed, which has a series of disadvantages such as long construction period, large investment in machinery and equipment, and high construction safety risks. Due to its structural characteristics, the integral gas production tree must be replaced under the condition of complete well pressure if the entire valve is to be replaced, which is currently impossible to implement.

[0004] At present, there is an urgent need for a safety valve maintenance device to realize online maintenance of the faulty parts of the ground safety valve, but there are the following difficulties in realizing online maintenance of the safety valve. Since the existing safety valve maintenance requires the disassembly and assembly of the cylinder head on the surface of the actuator, the outer diameter of the cylinder head reaches 33cm, and it is connected to the actuator housing through a trapezoidal thread, but there is only a 2cm step structure on the outside. It is generally disassembled and assembled by chain pliers, but due to the thick anti-corrosion layer on the surface of the cylinder head and the small force-bearing area, the chain pliers are easy to slip during disassembly and assembly, and the cylinder head is difficult to disassemble and assemble. In addition, even if the cylinder head can be opened online, there is a thrust due to the compression of the spring inside the actuator. It is difficult to release the thrust with the existing technical means, which makes it difficult to safely remove the cylinder. On the whole, online maintenance of safety valves in the prior art is very inconvenient and there are safety hazards. Utility Model Content

[0005] The utility model aims to provide a new safety valve maintenance device to solve the problem that the online maintenance of the safety valve in the prior art is very inconvenient and has potential safety hazards.

[0006] The utility model provides a safety valve maintenance device, which comprises a cylinder head disassembly assembly component and a liquid cylinder replacement component. The cylinder head disassembly assembly component comprises a clamping ring, which has a rotation-stopping connection structure for rotation-stopping assembly with the cylinder head, and a screwing operation structure is also provided on the clamping ring. The liquid cylinder replacement component comprises a threaded ring, and the ring body of the threaded ring has an external thread section adapted to the internal thread of the end of the actuator. A threaded push rod is installed on the threaded ring at a position corresponding to the axial direction of the spring flange, so that the spring flange can be pushed by the threaded push rod, and the inner hole of the threaded ring constitutes a channel for removing and removing the liquid cylinder.

[0007] Furthermore, the retaining ring has an outer ring section that is sleeved on the cylinder head. The outer ring section is provided with a stop pin hole for the stop pin to pass through and be inserted into the positioning pin hole on the outer peripheral surface of the cylinder head. The stop pin hole and the stop pin constitute the stop connection structure.

[0008] Furthermore, the anti-slip structure is provided on the anti-slip pin or the anti-slip pin is an elastic cylindrical pin to prevent the anti-slip pin from slipping out of the anti-slip pin hole.

[0009] Furthermore, a set screw hole connected to the stop pin hole is provided on the end surface of the outer ring segment, so as to be used for screwing the set screw to fix the stop pin to prevent it from falling off.

[0010] Furthermore, the anti-rotation pin is provided with an annular groove, which axially corresponds to the set screw hole after the anti-rotation pin is installed in the anti-rotation pin hole, so that the end of the set screw can be inserted.

[0011] Furthermore, the screwing operation structure includes a force-applying screwing section which is arranged on the end surface of the outer ring section and extends axially outward, and the force-applying screwing section is provided with a torque hole for the torque rod to penetrate.

[0012] Furthermore, the force-applying screwing section is an annular cylinder section, and the torque holes are arranged in pairs, and the torque holes of the same pair are used for the same torque rod to pass through.

[0013] Furthermore, the end of the ring body of the threaded ring has a force transmission convex ring for being sleeved on the outer ring segment, and the force transmission convex ring is provided with a force transmission pin hole corresponding to the stop pin hole, so that the stop pin can be inserted into the stop pin hole and the force transmission pin hole in sequence.

[0014] Furthermore, the inner diameter of the force transmission convex ring is smaller than the inner diameter of the ring body of the threaded ring, and the threaded push rod is screwed onto the force transmission convex ring and is located inside the ring body of the threaded ring.

[0015] Furthermore, there is more than one threaded push rod and they are evenly distributed around the circumference.

[0016] The utility model provides a new safety valve maintenance device, which includes a cylinder head disassembly assembly component and a cylinder replacement assembly. The cylinder head disassembly assembly component includes a clamp ring, which has a rotation-stopping connection structure for rotation-stopping assembly with the cylinder head. Through the rotation-stopping connection structure, we can tightly fix the clamp ring on the cylinder head to prevent their relative movement. The clamp ring also has a screwing operation structure, through which the clamp ring can be screwed, so that the cylinder head can be screwed out of the actuator cavity more easily than the traditional chain disassembly. The cylinder head disassembly assembly component can avoid the chain clamp slipping caused by the thick anti-corrosion layer on the surface of the cylinder head and the small force area in the prior art, thereby reducing the difficulty of cylinder head disassembly. The cylinder replacement assembly includes a threaded ring, the ring body of the threaded ring has an external thread section that is adapted to the internal thread at the end of the actuator, and a threaded push rod is installed on the threaded ring at a position corresponding to the axial direction of the spring flange, so that the spring flange can be pushed by the threaded push rod. The inner hole of the threaded ring constitutes a channel for removing and unloading the cylinder. When in use, the threaded ring is screwed into the actuator through thread matching, and after tightening, the spring flange is pushed by the threaded push rod, and the thrust of the piston spring of the actuator is replaced by the thrust of the thread, thereby smoothly releasing the thrust of the piston spring.

[0017] The safety valve maintenance device of the utility model solves the problem that the current ground safety valve fault treatment can only be handled by replacing the actuator or replacing the entire safety valve. It successfully realizes the online targeted maintenance of the safety valve, avoids the serious consequences of valve stem bending and actuator damage caused by the failure to release the spring thrust and the instability during the crane operation during the replacement of the actuator, and improves a series of shortcomings such as the long maintenance construction period of the whole valve, the large investment of machinery and equipment and personnel, and the high construction safety risk. In addition, the utility model has a simple structure, reliable operation, low cost, and is easy to promote and apply on a large scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the ground safety valve structure;

[0019] Figure 2 It is a schematic diagram of the anatomical structure of the liquid cylinder;

[0020] Figure 3 It is a schematic diagram of the structure of the cylinder head disassembly assembly and the hydraulic cylinder replacement assembly of the utility model;

[0021] Figure 4 It is a schematic diagram of the thread ring structure;

[0022] Figure 5 Schematic diagram of the clamping ring structure;

[0023] Figure 6 Schematic diagram for disassembling and assembling components of cylinder head;

[0024] Figure 7 Schematic diagram for using the hydraulic cylinder replacement assembly.

[0025] In the figure: 1. threaded ring; 11. push threaded hole; 12. inner hole of threaded ring; 13. force transmission pin hole; 14. outer thread section of threaded ring; 2. threaded push rod; 3. snap ring; 31. center through hole of snap ring; 32. torque hole; 33. set screw hole; 34. stop pin hole; 4. stop pin; 5. set screw; 6. torque rod; 7. actuator; 701. cylinder head; 702. piston; 703. hydraulic cylinder; 704. rising rod; 705. screw cap; 706. hexagonal screw; 707. spring flange; 708. outer spring; 709 inner spring; 710. middle rod; 711. observation window cover; 8. ground safety valve. DETAILED DESCRIPTION

[0026] The features and performance of the utility model are further described below in conjunction with the embodiments.

[0027] The utility model is designed to address the gap in the prior art regarding a dedicated device for online targeted maintenance of hydraulic safety valves. In the prior art, safety valve maintenance generally has the problems of difficulty in overall replacement, long maintenance cycle, high risk, and high replacement cost. The implementation of online maintenance mainly includes the following process. First, the cylinder head needs to be disassembled and assembled, then the liquid cylinder is removed to start maintenance, and after the maintenance is completed, the liquid cylinder is reinstalled, and finally the cylinder head is reinstalled. However, there are the following difficulties in implementing the process. 1. Safety valve maintenance now requires disassembly and assembly of the cylinder head on the surface of the actuator, but due to the thick anti-corrosion layer on the surface of the cylinder head and the small force-bearing area, the prior art is prone to slipping during disassembly and assembly, and the cylinder head is difficult to disassemble and assemble. 2. Since there is a large amount of thrust after the internal spring of the actuator is compressed, it is difficult to release the thrust with the prior art, resulting in the inability to safely disassemble and assemble the liquid cylinder and the inability to properly repair the safety valve.

[0028] In view of the above problems, the utility model designs a new safety valve maintenance device, such as Figure 3-Figure 7As shown, the safety valve maintenance device includes a cylinder head disassembly assembly and a cylinder replacement assembly. The cylinder head disassembly assembly includes a snap ring 3, which has a rotation-stopping connection structure for rotation-stopping assembly with the cylinder head 701. The snap ring 3 can be radially fixed on the cylinder head through the rotation-stopping connection structure to prevent their relative rotation. The snap ring 3 also has a screwing operation structure. Through the screwing operation structure, the snap ring 3 is screwed to screw the cylinder head 701 out of the cavity of the actuator 7. The cylinder head disassembly assembly solves the problem in the prior art that the chain clamp is easy to slip and the cylinder head is difficult to disassemble due to the thick anti-corrosion layer on the surface of the cylinder head and the small force area.

[0029] The cylinder replacement assembly includes a threaded ring 1, the threaded ring 1 has an outer threaded section 14 that matches the inner thread at the end of the actuator 7, and a threaded push rod 2 is installed on the threaded ring 1 at a position corresponding to the axial direction of the spring flange 707. The inner hole 12 of the threaded ring constitutes a channel for removing the cylinder. When in use, the threaded ring 1 is screwed into the actuator 7 through threaded matching, and the spring flange 707 is pushed by the threaded push rod 2 after tightening. The pushing force of the threaded push rod 2 replaces the thrust of the piston spring inside the actuator 7, solving the problem that the cylinder cannot be safely disassembled. After the maintenance is completed, the cylinder 703 and the cylinder cover 701 are installed back to the actuator 7. Since the operation is opposite to the disassembly, it will not be repeated here.

[0030] Based on the above main concepts, different embodiments are provided below for illustration.

[0031] In Example 1, by means of Figure 3 , Figure 5 , Figure 6 As shown, this embodiment mainly introduces the anti-rotation assembly method of the clamping ring 3 and the cylinder head in the safety valve maintenance device. In this embodiment, the clamping ring 3 has an outer ring section that is sleeved on the cylinder head 701. The diameter of the central through hole 31 of the clamping ring is larger than the diameter of the cylinder head. The outer ring section is provided with a anti-rotation pin hole 13 for the anti-rotation pin 4 to pass through and insert into the positioning pin hole on the outer peripheral surface of the cylinder head 701. The anti-rotation pin hole 13 and the anti-rotation pin 4 constitute the anti-rotation connection structure, and the anti-rotation connection between the cylinder head 701 and the cylinder head disassembly assembly is performed through the anti-rotation connection structure. Since the anti-rotation connection structure utilizes the pin hole located on the outer peripheral surface of the cylinder head 701 itself, it is easy and quick to install, the connection is tight, and it can effectively prevent the disassembly and assembly tools from slipping when disassembling and assembling the cylinder head 701.

[0032] On this basis, in a better embodiment, the stop pin 4 has the risk of falling due to gravity during the screwing operation. To solve the above problem, we designed a stop pin anti-drop structure, and a set screw hole 33 connected to the stop pin hole 34 is provided on the end face of the outer ring segment, so as to be used to screw the set screw 5 to fix the stop pin 4 to prevent it from falling off. Furthermore, in another embodiment, in order to further enhance the locking reliability of the set screw 5 on the stop pin 4 and reduce the possibility of operational errors, an annular groove can also be provided on the stop pin 4. After the stop pin 4 is installed in the stop pin hole 34, it is axially corresponding to the set screw hole 33. When the set screw 5 is screwed in for a certain distance, the end can be stuck in the annular groove to prevent it from falling off.

[0033] In another embodiment, the anti-drop structure of the stop pin can also use a rubber hoop, which is cylindrical, and the inner diameter of the rubber hoop is slightly smaller than the outer ring segment and can be successfully put on the outer ring segment. After the stop pin 4 is fully inserted into the stop pin hole 34 and the positioning pin hole, the rubber hoop is put on the outer ring segment of the clamp 3, and the elastic force of the rubber is used to hold the stop pin 4 tightly to prevent the stop pin 4 from falling off. In other embodiments, the stop pin 4 can be an elastic cylindrical pin, which is inserted into the stop pin hole 34 and the positioning pin hole. After the elastic cylindrical stop pin is expanded and fixed, it is elastically deformed to tighten the stop pin to prevent it from falling off.

[0034] Of course, the anti-rotation connection structure between the cylinder head 701 and the cylinder head disassembly and assembly assembly is not limited to the anti-rotation connection structure introduced above. In other embodiments, a threaded hole is provided on the outer ring segment, and a top screw is screwed into the threaded hole. After the outer ring segment is mounted on the cylinder head, the top screw is screwed to tighten the outer peripheral surface of the cylinder head, thereby realizing a anti-rotation connection between the two.

[0035] Based on the above design concept and various embodiments, this article also introduces embodiment 2, with the help of Figure 3 , Figure 5 , Figure 6 As shown, this embodiment is mainly a specific introduction to the screwing operation mode of the clamping ring 3 and the cylinder cover 701 in the safety valve maintenance device. The screwing operation structure includes an annular cylindrical force-applying screwing section extending axially outward and arranged on the end surface of the outer ring section of the clamping ring 3. The force-applying screwing section is provided with a torque hole 32 for the torque rod 6 to penetrate. The torque holes 32 are arranged in pairs, and the torque holes 32 of the same pair are used for the same torque rod 6 to pass through. Through the screwing operation structure, the clamping ring 3 can be screwed conveniently and quickly, and the cylinder cover 701 can be screwed and disassembled from the cavity of the actuator 7 at the same time. In other embodiments, the screwing operation structure is a radial convex ring provided at the end of the ring body of the threaded ring 1. The convex ring is set as a polyhedral structure that is convenient for matching with the caliper profile. The caliper is used to directly screw the convex ring, so that the clamping ring 3 drives the cylinder cover 701 to rotate out of the actuator 7. The convex ring has a simple structure and can withstand large torque.

[0036] Based on the above design concept and various embodiments, this article also introduces embodiment 3, with the help of Figure 3 , Figure 4 , Figure 7 As shown, the threaded ring 1 has an outer threaded section 14 of the threaded ring adapted to the inner thread at the end of the actuator 7. The end of the threaded ring body has a force transmission convex ring and a limit convex ring for the outer ring section to be sleeved. The force transmission convex ring is provided with a force transmission pin hole 13 corresponding to the stop pin hole 34, so that the stop pin 4 can be inserted into the stop pin hole 34 and the force transmission pin hole 13 in sequence. The stop connection cylinder cover disassembly assembly assembly and the cylinder replacement assembly are connected, so that the threaded ring 1 can be assembled with the cylinder cover disassembly assembly assembly, which is convenient for the screwing and disassembly of the cylinder replacement assembly. The limit convex ring and the end of the actuator 7 are stopped and positioned, which is convenient for the positioning of the screwing operation structure. The inner hole 12 of the threaded ring constitutes a channel for removing and removing the cylinder. The force transmission convex ring also has a push threaded hole 11 for cooperating with the threaded push rod 2. The threaded push rod 2 has more than one and is evenly distributed circumferentially on the end of the threaded ring 1 to ensure that the threaded push rod 2 can evenly push the spring flange 707. In another embodiment, a force transmission convex ring is radially arranged at the ring body end of the threaded ring 1, and the inner diameter of the force transmission convex ring is smaller than the inner diameter of the ring body of the threaded ring 1. The threaded push rod 2 is screwed on the force transmission convex ring and is located inside the ring body of the threaded ring 1. The force transmission convex ring is arranged as a polyhedron structure convenient for matching with the caliper profile. The threaded ring 1 can be screwed onto the actuator 7 by directly screwing the convex ring using the caliper. The inner hole 12 of the threaded ring constitutes a channel for taking and unloading the liquid cylinder. There are more than one threaded push rods 2 and they are evenly distributed circumferentially on the end of the threaded ring 1 to ensure that the threaded push rods 2 can evenly push the spring flange 707.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A safety valve maintenance device, characterized in that: The safety valve maintenance device includes a cylinder head disassembly and assembly component and a liquid cylinder replacement component. The cylinder head disassembly and assembly component includes a retaining ring, which has a non-rotation connection structure for non-rotation assembly with the cylinder head. The retaining ring also has a screwing operation structure. The liquid cylinder replacement component includes a threaded ring, and the ring body of the threaded ring has an external thread section that is adapted to the internal thread of the end of the actuator. A threaded push rod is installed on the threaded ring at a position corresponding to the axial direction of the spring flange so that the spring flange can be pushed by the threaded push rod. The inner hole of the threaded ring constitutes a channel for removing and removing the liquid cylinder.

2. The safety valve maintenance device according to claim 1, characterized in that: The clamping ring has an outer ring section which is sleeved on the cylinder head. The outer ring section is provided with a stop pin hole for the stop pin to pass through and be inserted into the positioning pin hole on the outer peripheral surface of the cylinder head. The stop pin hole and the stop pin constitute the stop connection structure.

3. The safety valve maintenance device according to claim 2, characterized in that: The anti-slip structure is provided on the anti-slip pin or the anti-slip pin is an elastic cylindrical pin to prevent the anti-slip pin from slipping out of the anti-slip pin hole.

4. The safety valve maintenance device according to claim 3, characterized in that: A set screw hole connected to the stop pin hole is provided on the end surface of the outer ring segment for screwing the set screw to prevent the stop pin from falling off.

5. The safety valve maintenance device according to claim 4, characterized in that: The anti-rotation pin is provided with an annular groove, which corresponds axially to the set screw hole after the anti-rotation pin is installed in the anti-rotation pin hole, so as to allow the end of the set screw to be clamped.

6. The safety valve maintenance device according to claim 2, characterized in that: The screwing operation structure comprises a force-applying screwing section which is arranged on the end surface of the outer ring section and extends axially outwards, and a torque hole for the torque rod to penetrate is provided on the force-applying screwing section.

7. The safety valve maintenance device according to claim 6, characterized in that: The force-applying screwing section is an annular cylinder section, and the torque holes are arranged in pairs, and the torque holes of the same pair are used for the same torque rod to pass through.

8. The safety valve maintenance device according to any one of claims 2 to 7, characterized in that: The end of the ring body of the threaded ring has a force transmission convex ring for being sleeved on the outer ring segment. The force transmission convex ring is provided with a force transmission pin hole corresponding to the stop pin hole, so that the stop pin can be inserted into the stop pin hole and the force transmission pin hole in sequence.

9. The safety valve maintenance device according to claim 8, characterized in that: The inner diameter of the force transmission convex ring is smaller than the inner diameter of the ring body of the threaded ring, and the threaded push rod is screwed onto the force transmission convex ring and is located inside the ring body of the threaded ring.

10. The safety valve maintenance device according to any one of claims 1 to 7, characterized in that: There is more than one threaded push rod and they are evenly distributed in the circumferential direction.

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