Double-sealing single-test-cavity plugging device

Abstract

The embodiment of the invention provides a double-sealing single-test-cavity plugging device, and belongs to the technical field of pipeline maintenance and first-aid repair. The feeding device is connected with the plugging combiner and is provided with a feeding hydraulic cylinder; the oil-electric pipe cylinder is inserted into the feeding cavity; the posture hydraulic cylinder is arranged in the feeding cavity; the spherical plugging head comprises a setting hydraulic cylinder, a sealing assembly and a shower head, the setting hydraulic cylinder comprises a setting hydraulic cylinder piston rod and a setting hydraulic cylinder barrel, and the sealing assembly comprises an upstream radial clamping ring, a driving check ring, an upstream sealing ring, a single test cavity ring, a downstream sealing ring, a driven check ring and a downstream clamping ring, and the driving check ring, the upstream sealing ring, the single test cavity ring, the downstream sealing ring, the driven check ring and the downstream clamping ring are arranged on the setting hydraulic cylinder barrel in a surrounding mode. The setting hydraulic cylinder barrel and the setting hydraulic cylinder piston rod define a first pressurizing cavity and a second pressurizing cavity which are arranged in the axial direction of the setting hydraulic cylinder piston rod and isolated from each other. According to the pipeline plugging device, the spherical plugging head is used for plugging in the flowing direction of a medium in the pipeline, and the problems of micro leakage and micro seepage of the pipeline can be effectively solved through dual plugging such as active plugging and passive plugging.

Description

Technical Field

[0001] Embodiments of the present disclosure belong to the technical field of pipeline maintenance and emergency repair, and particularly relate to a double-sealing and single-testing cavity plugging device. Background Art

[0002] When performing high / low-pressure plugging operations inside in-service oil and gas pipelines for maintenance and emergency repair, the plugging devices commonly used in China currently are hanging plugging devices. When plugging the medium inside the pipeline, the hanging plugging device forms a seal by relying on the rubber sealing ring on the plugging device to block the high-pressure medium inside the pipeline. Its sealing principle is to preset the interference amount between the rubber ring and the inner wall of the pipeline. In other words, it is to forcefully insert a sealing ring with a high interference amount into the pipeline, so that the sealing ring contacts the inner wall of the pipeline to form pressure, thereby achieving the sealing effect. This sealing effect is achieved by the interference principle of the rubber ring and the re-deformation and compression of the sealing ring under the assistance of the medium itself.

[0003] For decades, hanging plugging devices have been in use and are also the main equipment for high / low-pressure plugging operations on in-service pipelines in China. This plugging technology is what we call the "passive plugging technology of hanging plugging devices".

[0004] Due to the structure and sealing characteristics of the hanging plugging device belonging to passive plugging technology, there have always been problems of micro-leakage and micro-seepage during actual operations of this plugging device for many years. Therefore, how to solve the above problems has become an urgent technical problem for those skilled in the art. Summary of the Invention

[0005] Embodiments of the present disclosure aim to at least solve one of the technical problems existing in the prior art, and provide a double-sealing and single-testing cavity plugging device.

[0006] One aspect of the embodiments of the present disclosure provides a double-sealing and single-testing cavity plugging device, including: A plugging adapter, having a feeding cavity; A feeding device, connected to the plugging adapter, the feeding device having a feeding hydraulic cylinder inserted into the feeding cavity; An oil-electric pipe cylinder, inserted into the feeding cavity; An attitude hydraulic cylinder, arranged in the feeding cavity; A spherical plugging head, including a setting hydraulic cylinder, a sealing assembly arranged around the setting hydraulic cylinder, and a shower head that limits the sealing assembly to the setting hydraulic cylinder. The setting hydraulic cylinder includes a setting hydraulic cylinder piston rod connected to the attitude hydraulic cylinder and a setting hydraulic cylinder barrel sleeved on the setting hydraulic cylinder piston rod. The sealing assembly includes an upstream diameter snap ring arranged along the axial direction of the setting hydraulic cylinder piston rod, and an active retaining ring, an upstream sealing ring, a single-testing cavity ring, a downstream sealing ring, a passive retaining ring, and a downstream snap ring arranged around the setting hydraulic cylinder barrel; The setting cylinder barrel and the setting cylinder piston rod of the setting cylinder jointly enclose a first pressurizing chamber and a second pressurizing chamber that are arranged axially along the setting cylinder piston rod and isolated from each other. Both the first pressurizing chamber and the second pressurizing chamber are communicated with the oil-electric pipe cylinder through the internal pipeline of the setting cylinder piston rod; During the plugging process, the setting cylinder barrel compresses the upstream sealing ring and the downstream sealing ring under the action of the medium in the pipeline to be plugged to passively plug the inner wall of the pipeline, and also uses the oil-electric pipe cylinder to drive the setting cylinder barrel to compress the upstream sealing ring and the downstream sealing ring to actively plug the inner wall of the pipeline.

[0007] Furthermore, it further includes: a snap ring adapter ring, which is sleeved on the setting cylinder piston rod and clamped between the downstream snap ring and the shower head.

[0008] Optionally, the upstream diameter snap ring is fixedly connected to the setting cylinder piston rod; the plugging device further includes a displacement sensor arranged on the upstream diameter snap ring, the displacement sensor corresponds to the position of the magnetic ring installed on the setting cylinder barrel, and the displacement sensor measures the displacement of the setting cylinder barrel by detecting the position change of the magnetic ring.

[0009] Optionally, an air blowing circuit is arranged inside the setting cylinder piston rod, and air holes are arranged on the shower head; The plugging device further includes an air blowing circuit joint connected to a gas generator, the air blowing circuit joint is installed at the air inlet of the air blowing circuit, and the air outlet of the air blowing circuit is connected to the air holes of the shower head.

[0010] Optionally, the feeding device includes two main support frames that are arranged oppositely, are respectively connected to the plugging adapter and inserted into the feeding cavity; the feeding device further includes a plugging head rotating shaft arranged in the feeding cavity and rotatably connected to the setting cylinder piston rod, an attitude cylinder fixed shaft arranged in the feeding cavity and rotatably connected to the attitude cylinder, a knife edge support ring arranged on the main support frame and used for supporting at the pipe opening knife edge, a support ring arranged on the main support frame and in clearance fit with the plugging adapter, and a first installation socket arranged on the main support frame and inserted with the oil-electric pipe cylinder.

[0011] Furthermore, it further includes: a plugging head limiting rod assembly, which is arranged in the feeding cavity and is used for limiting the position of the spherical plugging head.

[0012] Optionally, the attitude hydraulic cylinder includes an attitude hydraulic cylinder body, an electromagnetic chamber housing disposed on the attitude hydraulic cylinder body, a fixed earring disposed on the electromagnetic chamber housing, a steering displacement sensor disposed in the electromagnetic chamber housing, an attitude piston rod disposed in the attitude hydraulic cylinder body, a magnetic rod disposed in the attitude hydraulic cylinder body and connected to the attitude piston rod, and a moving earring disposed on the attitude piston rod and used to connect to the spherical plugging head.

[0013] Further, it further includes: a gate valve, which is disposed on the outer periphery of the feeding device and is hermetically connected to the plugging adapter.

[0014] Optionally, the oil-electric pipe cylinder includes a main pipe cylinder body inserted into the feeding cavity, a scale assembly disposed on the main pipe cylinder body, a flange hatch cover hermetically connected to the main pipe cylinder body, an oil pipe cylinder top hatch assembly connected to the flange hatch cover, an oil and gas pipe assembly and a control cable assembly disposed in the oil pipe cylinder top hatch assembly, and a sealing steel ring hermetically connected between the flange hatch cover and the oil pipe cylinder top hatch assembly.

[0015] Further, it further includes: a second installation socket, which is disposed on the main support frame; A feeding hydraulic cylinder main shaft, which is inserted into the feeding cavity and plugged into the second installation socket, and the feeding hydraulic cylinder main shaft is used to drive the feeding device to move.

[0016] The beneficial effects of the embodiments of the present disclosure include: In the present invention, the spherical plugging head plugs along the flow direction of the medium in the pipeline, and through double plugging such as active plugging and passive plugging, the problems of micro-leakage and micro-seepage of the pipeline can be effectively solved. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a double-sealing and single-testing cavity plugging device according to an embodiment of the present disclosure; Figure 2 It is a schematic structural diagram of a spherical plugging device according to an embodiment of the present disclosure, wherein the lower part of the spherical plugging device is shown in a sectional view; Figure 3 It is a schematic structural diagram of a feeding device according to an embodiment of the present disclosure; Figure 4 It is a schematic sectional view of an attitude hydraulic cylinder according to an embodiment of the present disclosure; Figure 5 It is a schematic structural diagram of an oil-electric pipe cylinder according to an embodiment of the present disclosure; Figure 6 It is a schematic sectional view of an oil-electric pipe cylinder along A-A according to an embodiment of the present disclosure.

[0018] In the figure: 1. Spherical plugging head; 2. Feeding device; 3. Attitude hydraulic cylinder; 4. Gate valve; 5. Oil-electric pipe cylinder; 6. Plugging head limit rod assembly; 7. Plugging head rotating shaft assembly; 8. Plugging head steering support arm; 9. Plugging head dynamic steering shaft assembly; 10. Oil-electric pipe laying device assembly; 11. Attitude cylinder fixed shaft assembly; 12. Hydraulic / electrical pipeline; 13. Plugging adapter; 14. Feeding hydraulic cylinder main shaft; 15. Manual-automatic integrated control valve block; 16. External-pipe hydraulic / electrical pipeline; 17. External-pipe control cable; 18. External-pipe human-machine interaction control console; 19. External-pipe hydraulic station; 111. Shower head; 112. Snap ring joint ring; 113. Downstream snap ring; 114. Passive retaining ring; 115. Downstream sealing ring; 116. Single test chamber ring; 117. Upstream sealing ring; 118. Active retaining ring; 119. Upstream diameter snap ring; 131. Feeding chamber; 1111. Displacement sensor; 1112. Pneumatic blowing circuit joint; 1113. Circumferential limiter; 1114. Setting hydraulic cylinder piston rod; 1115. Setting hydraulic cylinder barrel; 21. Main support frame; 22. Plugging head rotating shaft; 23. Main shaft rod; 24. Knife-edge support ring; 25. Pipe laying device; 26. Attitude cylinder fixed shaft; 27. Support ring; 28. First installation socket; 31. Attitude hydraulic cylinder body; 32. Electromagnetic chamber housing; 33. Fixed earring; 34. Electrical cable; 35. Steering displacement sensor; 36. Magnetic rod; 37. Attitude piston rod; 38. Moving earring; 51. Oil pipe cylinder main cylinder body; 52. Scale assembly; 53. Flange hatch cover; 54. Oil pipe cylinder top cabin assembly; 55. Oil and gas pipe assembly; 56. Control cable assembly; 57. Sealing steel ring. Detailed implementation manners

[0019] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0020] The following further describes the embodiments of the present application in conjunction with the accompanying drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments. In the description of the present application, it should be noted that unless otherwise stated, the meaning of "a plurality" is more than two; the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0021] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0022] As Figure 1-2 shown, a double-sealed single-test cavity plugging device includes a plugging adapter 13, a feeding device 2, an oil-electric pipe cylinder 5, an attitude hydraulic cylinder 3, and a spherical plugging head 1. The plugging adapter 13 has a feeding cavity 131. The feeding device 2 is connected to the plugging adapter 13. The feeding device 2 has a feeding hydraulic cylinder inserted into the feeding cavity 131. The oil-electric pipe cylinder 5 is inserted into the feeding cavity 131. The attitude hydraulic cylinder 3 is arranged in the feeding cavity 131.

[0023] The spherical plugging head 1 includes a setting hydraulic cylinder, a sealing assembly arranged around the setting hydraulic cylinder, and a shower head 111 that limits the sealing assembly to the setting hydraulic cylinder. The setting hydraulic cylinder includes a setting hydraulic cylinder piston rod 1114 connected to the attitude hydraulic cylinder 3 and a setting hydraulic cylinder barrel 1115 sleeved on the setting hydraulic cylinder piston rod 1114. The sealing assembly includes an upstream diameter snap ring 119 arranged along the axial direction of the setting hydraulic cylinder piston rod 1114, and an active retaining ring 118, an upstream sealing ring 117, a single-test cavity ring 116, a downstream sealing ring 115, a passive retaining ring 114, and a downstream snap ring 113 arranged around the setting hydraulic cylinder barrel 1115.

[0024] The setting cylinder barrel 1115 and the setting cylinder piston rod 1114 together enclose a first pressurizing chamber 1116 and a second pressurizing chamber 1117 that are arranged axially along the setting cylinder piston rod 1114 and are isolated from each other. Both the first pressurizing chamber 1116 and the second pressurizing chamber 1117 are communicated with the oil-electric pipe cylinder 5 through the internal pipeline of the setting cylinder piston rod 1114.

[0025] During the plugging process, the setting cylinder barrel 1115 compresses the upstream sealing ring 117 and the downstream sealing ring 115 under the action of the medium in the pipeline to be plugged, so as to passively plug the inner wall of the pipeline. Moreover, the oil-electric pipe cylinder 5 is also used to drive the setting cylinder barrel 1115 to compress the upstream sealing ring 117 and the downstream sealing ring 115 to actively plug the inner wall of the pipeline.

[0026] Specifically, during the driving process, the high-pressure oil in the oil-electric pipe cylinder 5 is injected into the second pressurizing chamber 1117, causing the setting cylinder barrel 1115 to move along the flow direction of the medium in the pipeline (at this time, the space of the first pressurizing chamber 1116 is compressed and the space of the second pressurizing chamber 1117 expands), so that the upstream sealing ring 117 and the downstream sealing ring 115 are compressed. On the contrary, the high-pressure oil in the oil-electric pipe cylinder 5 is injected into the first pressurizing chamber 1116, causing the setting cylinder barrel 1115 to move along the reverse flow direction of the medium in the pipeline (at this time, the space of the first pressurizing chamber 1116 expands and the space of the second pressurizing chamber 1117 is compressed), so that the upstream sealing ring 117 and the downstream sealing ring 115 come into contact and are compressed. During this process, the second pressurizing chamber 1117 is depressurized.

[0027] In the present invention, the spherical plugging head 1 plugs along the flow direction of the medium in the pipeline. And through double plugging such as active plugging and passive plugging, the problems of micro-leakage and micro-seepage of the pipeline can be effectively solved.

[0028] In some embodiments, the plugging device further includes a snap ring adapter ring 112. The snap ring adapter ring 112 is sleeved on the setting cylinder piston rod 1114 and is clamped between the downstream snap ring 113 and the shower head 111. The snap ring adapter ring 112 is used to fix the downstream snap ring 113 to prevent the downstream snap ring 113 from disintegrating.

[0029] In some embodiments, the upstream diameter snap ring 119 is fixedly connected to the setting cylinder piston rod 1114. The plugging device further includes a displacement sensor 1111 arranged on the upstream diameter snap ring 119. The displacement sensor 1111 corresponds to the position of the magnetic ring installed on the setting cylinder barrel 1115. The displacement sensor 1111 measures the displacement of the setting cylinder barrel 1115 by detecting the position change of the magnetic ring.

[0030] In the present invention, by providing a displacement sensor 1111 on the upstream path clamp ring 119 and cooperating with a magnetic ring installed on the setting cylinder 1115 of the setting hydraulic cylinder, the precise measurement of the displacement of the setting cylinder 1115 of the setting hydraulic cylinder can be achieved. This non-contact detection method avoids mechanical wear and improves the accuracy and reliability of the measurement. The displacement sensor 1111 can provide real-time displacement data, facilitating the operator or the control system to timely adjust the equipment status and ensuring the smooth progress of the plugging operation.

[0031] In some embodiments, an air blowing circuit 11141 is provided inside the piston rod 1114 of the setting hydraulic cylinder, and the shower head 111 is provided with air holes. The plugging device further includes an air blowing circuit joint 1112 connected to the gas generator. The air blowing circuit joint 1112 is installed at the air inlet of the air blowing circuit 11141, and the air outlet of the air blowing circuit 11141 is connected to the air holes of the shower head 111.

[0032] In the present invention, by spraying high-pressure gas from the shower head 111 and the air blowing circuit joint 1112, the dust, debris (iron filings) and other impurities on the inner wall of the pipeline can be effectively removed, ensuring a clean and tidy working environment before the plugging operation. The cleaned inner wall of the pipeline can better contact the plugging head, enhancing the sealing performance and reducing the leakage risk. During the plugging process, the high-pressure gas can continuously purge the working area to prevent external impurities or residues from entering the plugging system and avoid equipment failure due to foreign object blockage.

[0033] In some embodiments, referring to Figure 3 , the feeding device 2 includes two main support frames 21 that are oppositely arranged, respectively connected to the plugging adapter 13 and inserted into the feeding cavity 131. The feeding device 2 further includes a plugging head rotating shaft 22 disposed in the feeding cavity 131 and rotatably connected to the piston rod 1114 of the setting hydraulic cylinder, an attitude cylinder fixed shaft 26 disposed in the feeding cavity 131 and rotatably connected to the attitude hydraulic cylinder 3, a knife edge support ring 24 disposed on the main support frame 21 and used for supporting at the pipeline opening knife edge, a support ring 27 disposed on the main support frame 21 and in clearance fit with the plugging adapter 13, and a first installation socket 28 disposed on the main support frame 21 and plugged with the oil-electric pipe cylinder 5.

[0034] In some embodiments, the plugging device further includes a plugging head limiting rod assembly 6. The plugging head limiting rod assembly 6 is disposed in the feeding cavity 131 and is used to limit the position of the spherical plugging head 1.

[0035] In the present invention, the plug head limiting rod assembly 6 is arranged in the feeding cavity 131 and is used to limit the position of the spherical plug head 1, ensuring that the plug head maintains an accurate position during operation, which is beneficial to achieving high-precision plugging operations. By restricting the moving range of the plug head, the position deviation caused by external interference or improper operation can be effectively reduced, improving the success rate and reliability of the plugging operation.

[0036] In some embodiments, referring to Figure 4 , the attitude hydraulic cylinder 3 includes an attitude hydraulic cylinder body 31, an electromagnetic chamber housing 32 arranged on the attitude hydraulic cylinder body 31, a fixed earring 33 arranged on the electromagnetic chamber housing 32, a steering displacement sensor 35 arranged in the electromagnetic chamber housing 32, an attitude piston rod 37 arranged in the attitude hydraulic cylinder body 31, a magnetic rod 36 arranged in the attitude hydraulic cylinder body 31 and connected to the attitude piston rod 37, and a moving earring 38 arranged on the attitude piston rod 37 and used to connect to the spherical plug head 1.

[0037] In some embodiments, the plugging device further includes a gate valve 4, and the gate valve 4 is arranged on the outer periphery of the feeding device 2 and is hermetically connected to the plugging adapter 13.

[0038] In the present invention, the hermetic connection between the gate valve 4 and the plugging adapter 13 ensures that no leakage occurs during operation and maintains the pressure stability of the system. During the plugging process, the gate valve 4 can effectively isolate the medium in the pipeline and prevent it from leaking into the external environment, protecting the safety of the operators and reducing the risk of environmental pollution. The gate valve 4 can be closed before the plugging operation to isolate the area to be plugged from the external system, avoiding accidental accidents caused by the flow of the medium and enhancing the safety of the operation. In case of an emergency, the flow of the medium can be cut off by quickly closing the gate valve 4 to quickly control the situation and reduce potential hazards.

[0039] In some embodiments, referring to Figure 5-6 , the oil-electric pipe cylinder 5 includes a main pipe cylinder body 51 inserted into the feeding cavity 131, a scale assembly 52 arranged on the main pipe cylinder body 51, a flange hatch cover 53 hermetically connected to the main pipe cylinder body 51, a pipe cylinder top cabin assembly 54 connected to the flange hatch cover 53, an oil and gas pipe assembly 55 and a control cable assembly 56 arranged on the pipe cylinder top cabin assembly 54, and a sealing steel ring 57 hermetically connected between the flange hatch cover 53 and the pipe cylinder top cabin assembly 54.

[0040] In some embodiments, the plugging device further includes a second installation socket 29 and a feeding hydraulic cylinder main shaft 14. The second installation socket 29 is arranged on the main support frame 21, the feeding hydraulic cylinder main shaft 14 is inserted into the feeding cavity 131 and is plugged into the second installation socket 29, and the feeding hydraulic cylinder main shaft 14 is used to drive the feeding device 2 to move.

[0041] In the present invention, the feed hydraulic cylinder main shaft 14 is fixed to the main support frame 21 through the second installation socket 29, and can drive the feed device 2 to move within the feed cavity 131 to achieve precise positioning of the plugging head. This design ensures that the plugging head can accurately reach the predetermined position within the pipeline. Since the feed hydraulic cylinder main shaft 14 can provide a stable and controllable driving force, it reduces the position deviation caused by manual operation or mechanical errors, and improves the accuracy of the plugging operation.

[0042] A specific example provided by the present disclosure includes: Specifically, as Figure 1 shown, a double-sealing and single-testing cavity plugging device includes: a spherical plugging head 1, a feed device 2, an attitude hydraulic cylinder 3, a gate valve 4, an oil-electric pipe cylinder 5, a plugging head limit rod assembly 6, a plugging head rotating shaft assembly 7, a plugging head steering arm 8, a plugging head dynamic steering shaft assembly 9, an oil-electric pipe routing device assembly 10, an attitude cylinder fixed shaft assembly 11, a hydraulic / electrical pipeline 12, a plugging adapter 13, a feed hydraulic cylinder main shaft 14, a manual-automatic integrated control valve block 15, an external-pipe hydraulic / electrical pipeline 16, an external-pipe control cable 17, an external-pipe human-machine interaction console 18, and an external-pipe hydraulic station 19.

[0043] As Figure 2 shown, the spherical plugging head 1 includes a shower head 111, a snap ring connection ring 112, a downstream snap ring 113, a passive retaining ring 114, a downstream sealing ring 115, a single-test cavity ring (also called a single-test pressure ring cavity) 116, an upstream sealing ring 117, an active retaining ring 118, an upstream diameter snap ring 119, a displacement sensor 1111, a gas-blowing circuit joint 1112, a circumferential limiter 1113, a setting hydraulic cylinder piston rod 1114, and a setting hydraulic cylinder barrel 1115.

[0044] Specifically, the shower head 111 is connected to the setting hydraulic cylinder piston rod 1114 through bolts. The shower head 111 has a fan-shaped array of exhaust holes. An air-blowing circuit 11141 is provided inside the setting hydraulic cylinder piston rod 1114, and the air-blowing circuit 11141 is communicated with the air holes. Among them, the shower head 111 is communicated with the air-blowing circuit joint 1112 through the air-blowing circuit 11141 and the air holes, and is connected to a gas generator through the air-blowing circuit joint 1112.

[0045] High-pressure gas is introduced through the gas-blowing circuit joint 1112, and a fan-shaped air knife is generated through the fan-shaped array of exhaust holes of the shower head 111 for purging the iron filings of the opening.

[0046] In some embodiments, an O-ring seal is provided between the shower head 111 and the piston rod 1114 of the seated hydraulic cylinder, for sealingly connecting the shower head 111 and the piston rod 1114 of the seated hydraulic cylinder. The O-ring seal is used to block the mating clearance between the shower head 111 and the piston rod 1114 of the seated hydraulic cylinder and the medium inside the pipe. The snap ring adapter 112 is used to fix the downstream snap ring 113 and prevent the downstream snap ring 113 from disassembling.

[0047] The downstream snap ring 113 is a split snap ring or an integral snap ring, and the downstream snap ring 113 is used to prevent the passive retaining ring 114 from axially displacing within the spherical plug 1.

[0048] There is a clearance fit between the outer diameter of the passive retaining ring 114 and the inner wall of the pipe. The smaller the clearance, the less the deformation and the less the amount of leakage of the downstream seal ring 115.

[0049] The downstream seal ring 115 is the second seal ring in the sealing assembly and is also a component of the double-seal single-test cavity plugging device. When it works, it is located downstream of the medium flow in the pipe.

[0050] The single-test cavity ring (also called the single-test pressure ring cavity) 116 is installed between the downstream seal ring 115 and the upstream seal ring 117. The downstream seal ring 115, the single-test cavity ring 116 and the upstream seal ring 117 together form a double-seal single-test pressure ring cavity structure.

[0051] The single-test cavity ring is provided with a cavity hole, which connects the hole system of the spherical plug 1 to the pressure gauge or pressure sensor outside the pipe. By unloading the medium pressure inside the single-test cavity ring and filling the medium into the single-test cavity ring and then boosting the pressure, the sealing effects of the downstream seal ring 115 and the upstream seal ring 117 are judged.

[0052] The upstream seal ring 117 is the first seal ring in the sealing assembly and is also a component of the double-seal single-test cavity plugging device. When it works, it is located upstream of the medium flow in the pipe.

[0053] The active retaining ring 118 functions to push and squeeze the upstream seal ring 117 to axially displace within the structure. There is a clearance fit between the outer diameter of the upstream active retaining ring 118 and the inner wall of the pipe. The smaller the clearance, the less the deformation and the less the amount of leakage of the upstream seal ring 117.

[0054] The upstream diameter snap ring 119 is fixed on the piston rod 1114 of the setting hydraulic cylinder. The upstream diameter snap ring 119 is a split snap ring, or it can also be an integral snap ring. The upstream diameter snap ring 119 functions to prevent the axial displacement of the setting hydraulic cylinder barrel 1115. A displacement sensor 1111 and a circumferential limiter 1113 are provided on the upstream diameter snap ring 119. Specifically, the upstream diameter snap ring 119 and the downstream snap ring 113 are arranged at the axially opposite ends of the setting hydraulic cylinder barrel 1115. The upstream diameter snap ring 119 serves as the installation carrier for the displacement sensor 1111 and the circumferential limiter 1113.

[0055] The electromagnetic chamber and magnetic rod assembly of the displacement sensor 1111 are fixedly installed on the upstream diameter snap ring 119. When the magnetic ring located on the setting hydraulic cylinder barrel 1115 moves, the displacement sensor 1111 is used to measure the displacement between the piston rod 1114 of the setting hydraulic cylinder and the setting hydraulic cylinder barrel 1115.

[0056] The air blowing circuit joint 1112 is installed at the air inlet of the air blowing circuit 11141 of the piston rod 1114 of the setting hydraulic cylinder. The upstream of the air blowing circuit joint 1112 is connected to an air pipe to an external gas generator of the pipeline, and the downstream is connected to the air holes of the shower head 111 through the air blowing circuit of the piston rod 1114 of the setting hydraulic cylinder.

[0057] The circumferential limiter 1113 is installed on the upstream diameter snap ring 119 and fixed on the piston rod 1114 of the setting hydraulic cylinder. The circumferential limiter 1113 functions to prevent the circumferential rotation of the upstream diameter snap ring 119 and the setting hydraulic cylinder barrel 1115, and to protect the magnetic rod of the displacement sensor 1111.

[0058] The piston rod 1114 of the setting hydraulic cylinder is rotationally connected to the plug head rotating shaft assembly 7. A piston of the setting hydraulic cylinder is installed on the piston rod 1114 of the setting hydraulic cylinder. The piston and the piston rod on the piston rod 1114 of the setting hydraulic cylinder are of split combination or integrally formed. The piston rod 1114 of the setting hydraulic cylinder and the setting hydraulic cylinder barrel 1115 form the setting hydraulic cylinder. The piston rod 1114 of the setting hydraulic cylinder cooperates with the plug head rotating shaft assembly 7 and generates a rotational movement around the plug head rotating shaft assembly 7.

[0059] A plug head steering support arm 8 is installed on the piston rod 1114 of the setting hydraulic cylinder. After installing the plug head dynamic steering shaft assembly 9 on the plug head steering support arm 8, it is connected to the attitude hydraulic cylinder 3.

[0060] A downstream snap ring 113, a passive retaining ring 114, a downstream sealing ring 115, a single test chamber ring 116, an upstream sealing ring 117, and an active retaining ring 118 are successively installed on the outer diameter of the setting hydraulic cylinder barrel 1115 and are respectively connected to these six components by hole clearance fit and sliding fit. In the setting hydraulic cylinder piston rod 1114 and the setting hydraulic cylinder barrel 1115, the setting hydraulic cylinder piston rod 1114 is fixed and stationary, and the setting hydraulic cylinder barrel 1115 slides relative to the setting hydraulic cylinder piston rod 1114.

[0061] The feeding device 2 includes a main support frame 21, a plug head rotating shaft 22, a main shaft rod 23, a knife-edge support ring 24, a pipe distributor 25, an attitude cylinder fixed shaft 26, a support ring 27, a first installation socket 28, and a second installation socket 29.

[0062] The main support frame 21 is used to install the plug head rotating shaft assembly 7, the plug head limit rod assembly 6, the knife-edge support ring 24, the oil and electric pipe distributor assembly 10, the attitude cylinder fixed shaft assembly 11, the support ring 27, the first installation socket 28, and the second installation socket 29. The main support frame 21 is the installation carrier of the above components and also the installation carrier of the spherical plug head 1. At the same time, the main support frame 21 is also the support body for the spherical plug head 1 to withstand the force of the medium in the pipeline.

[0063] The force transmission of the spherical plug head 1 is on the feeding device 2. The knife-edge support ring 24 and the support ring 27 on the feeding device 2 are the main force-bearing support points, and the knife-edge support ring 24 and the support ring 27 ensure the static balance of the spherical plug head 1 after being stressed.

[0064] The plug head rotating shaft 22 is the main rotating shaft in the plug head rotating shaft assembly 7. The plug head rotating shaft 22 is used to install the spherical plug head 1. The spherical plug head 1 rotates around the plug head rotating shaft 22. The plug head rotating shaft 22 is the force-bearing support body of the spherical plug head 1. After the plug head rotating shaft 22 is stressed, it transmits the force to the main shaft rod 23, the knife-edge support ring 24, and the support ring 27.

[0065] The main shaft rod 23 is the main shaft rod of the plug head limit rod assembly 6. The main shaft rod 23 bears the upward component force of the setting hydraulic cylinder piston rod 1114 in the spherical plug head 1 and at the same time transmits the force to the main support frame 21.

[0066] The knife-edge support ring 24 is installed on the main support frame 21. The knife-edge support ring 24 is also a support point for the main support frame 21 to bear force. This support point acts on the opening knife-edge, and the actual contact point with the knife-edge is a saddle-shaped linear contact surface. The contact area is related to the pipe wall thickness and the linear rotation length.

[0067] The pipe distributor 25 is the main pipe distribution device of the oil and electric pipe distributor assembly 10, such as Figure 3According to the description in , the pipe laying device 25 is installed on the main support frame 21 to lay pipes for the oil and electricity pipes. The installation position of the pipe laying device 25 is between the two main support frame bodies. The pipe laying device 25 rotates with the spherical plug head 1, and the oil and electricity pipelines between the oil and electricity pipe laying device assembly 10 and the spherical plug head 1 also swing accordingly.

[0068] The attitude cylinder fixed shaft 26 is the fixed shaft of the attitude cylinder fixed shaft assembly 11. The attitude cylinder fixed shaft 26 is used to install the fixed ear 33 of the attitude hydraulic cylinder 3. The cylinder body of the attitude hydraulic cylinder 3 swings around the attitude cylinder fixed shaft 26. The attitude cylinder fixed shaft 26 bears the tension and thrust of the attitude hydraulic cylinder 3. The load of the attitude hydraulic cylinder 3 is the plug head steering arm 8.

[0069] The support ring 27 is located at the upper end of the main support frame 21. There is a clearance fit between the outer diameter of the support ring 27 and the inner diameter of the plugging adapter 13 paper strip. When the spherical plug head 1 and the feeding device 2 enter and exit the pipeline, the support ring 27 plays a role in guiding and centering. After the force of the spherical plug head 1 is transmitted to the feeding device 2, the support ring 27 also plays the role of a force-bearing support point.

[0070] The first installation socket 28 is inserted into the oil and electricity pipe cylinder 5, and the second installation socket 29 is inserted into the main shaft 14 of the feeding hydraulic cylinder. Both the first installation socket 28 and the second installation socket 29 are connected to the main support frame 21 through a mortise and tenon structure and reinforced with bolts.

[0071] The attitude hydraulic cylinder 3 includes an attitude hydraulic cylinder body 31, an electromagnetic chamber housing 32, a fixed ear 33, an electrical cable 34, a steering displacement sensor 35, a magnetic rod 36, an attitude piston rod 37, and a moving ear 38.

[0072] The attitude hydraulic cylinder 3 is an integral structure, which is used to adjust the steering angle attitude of the spherical plug head 1. Among them, the attitude hydraulic cylinder body 31 and the attitude piston rod 37 form the attitude hydraulic cylinder 3. The electromagnetic chamber housing 32 is installed on the attitude hydraulic cylinder body 31, and the electromagnetic chamber housing 32 is used to install a displacement sensor for measuring the attitude of the attitude hydraulic cylinder 3.

[0073] The fixed ear 33 is installed on the electromagnetic chamber housing 32. The electrical cable 34 is connected to the steering displacement sensor 35 and passes through the cable hole of the electromagnetic chamber housing 32. The steering displacement sensor 35 and the magnetic rod 36 (sensor magnetic rod) form the steering displacement sensor 35 assembly. The moving ear 38 is installed on the attitude piston rod 37. After the attitude piston rod 37 does work in the attitude hydraulic cylinder body 31, the extension and retraction actions of the attitude piston rod 37 occur. The movement of the attitude piston rod 37 interferes with the magnetic field of the magnetic rod 36 and generates a hysteresis effect. Therefore, an angle algorithm is generated in the steering displacement sensor 35 and the real-time angle attitude of the spherical plug head 1 is obtained through the output of the current value.

[0074] The plugging adapter 13 is installed on the gate valve 4, which is a gate valve 4 for professional maintenance and repair construction. The gate valve 4 is installed on a plugging tee for professional maintenance and repair construction. The plugging adapter 13, the gate valve 4, and the plugging tee enclose a sealed feeding chamber 131.

[0075] The oil and electric pipe cylinder 5 includes an oil pipe cylinder main body 51, a scale assembly 52, a flange hatch cover 53, an oil pipe cylinder top cabin assembly 54, an oil and gas pipe assembly 55, a control cable assembly 56, and a sealing steel ring 57.

[0076] The oil pipe cylinder main body 51 supplies oil and electricity to the spherical plugging head. The required oil / electric pipe needs to implement the through-wall technology and the matching structure under the pressure difference environment of the media inside and outside the pipe through the oil and electric pipe cylinder 5. The oil / electric pipe outside the pipe is connected to the oil and electric pipe laying device assembly 10 through the oil and electric pipe cylinder 5 for secondary fixation.

[0077] The scale assembly 52 is installed on the oil pipe cylinder main body 51. When the feeding hydraulic cylinder spindle 14 drives the feeding device 2 to move, the oil pipe cylinder main body 51 will move simultaneously. The movement trajectory of the scale assembly 52 is reflected on the outer shell of the feeding hydraulic cylinder in real time, and the accurate position of the spherical plugging head 1 entering or exiting the pipe can be measured.

[0078] The flange hatch cover 53 acts on the oil and gas pipe assembly 55 and the control cable assembly 56. The flange hatch cover 53 (set on the oil pipe cylinder) and the oil pipe cylinder main body 51 form a flange sealing structure system. The flange hatch cover 53 can also be defined as a blind flange cover for passing through the wall. Oil / electric interfaces are arranged on this flange cover, and this interface and the oil / electric joint are a threaded connection and sealing combination. The oil / electric pipe on the inner cavity side of the flange hatch cover 53 and the oil pipe cylinder main body 51 is communicated with the medium inside the pipe, and vice versa, it is exposed to the atmospheric environment.

[0079] The oil pipe cylinder top cabin assembly 54 plays a role in protecting against bumps and fixing the pipe / cable for the oil and gas pipe assembly 55 and the control cable assembly 56. The joints of the oil and gas pipe assembly 55 and the matching oil and gas pipe components are respectively installed on the inner and outer sides of the flange hatch cover 53, and the installation places have the joint sealing characteristics. The socket joints of the control cable assembly 56 and the matching control cable components are respectively installed on the inner and outer sides of the flange hatch cover 53, and the installation places have the joint sealing characteristics. The sealing steel ring 57 is installed between the flange of the oil pipe cylinder main body 51 and the flange hatch cover 53 to play a sealing role.

[0080] The plugging head limit rod assembly 6 is installed on the feeding device 2. The main shaft rod 23 in the plugging head limit rod assembly 6 is the main shaft rod of the plugging head limit rod assembly 6. The main shaft rod 23 bears the upward component force of the sealing hydraulic cylinder piston rod 1114 in the spherical plugging head 1, and at the same time transmits the force to the feeding device 2, playing a role in preventing the spherical plugging head 1 from tilting upwards and affecting the sealing performance of the downstream sealing ring 115 and the upstream sealing ring 117.

[0081] The plugging head rotating shaft assembly 7 is installed on the feeding device 2. The main shaft in the plugging head rotating assembly is used to install and connect the plugging head steering arm 8 connected to the spherical plugging head 1, and the plugging head steering arm 8 and the spherical plugging head 1 are rigidly connected.

[0082] The plugging head steering arm 8 is rigidly connected to the setting cylinder piston rod 1114 in the spherical plugging head 1. The center line of the hole on the plugging head steering arm 8 and the axis of the setting cylinder piston rod 1114 maintain a fixed positional tolerance relationship. The hole of the plugging head steering arm 8 and the main shaft of the plugging head rotating shaft assembly 7 form a shaft-hole fit. The acting force of the attitude cylinder 3 is loaded on the plugging head dynamic steering shaft assembly 9, generating a rotational torque between the plugging head dynamic steering shaft assembly 9 and the plugging head rotating shaft assembly 7, thereby driving the spherical plugging head 1 to rotate around the plugging head rotating shaft assembly 7.

[0083] The plugging head dynamic steering shaft is installed on the plugging head steering arm 8. The plugging head dynamic steering shaft assembly 9 and the moving earring 38 of the attitude cylinder 3 form a shaft-hole fit relationship. The plugging head dynamic steering shaft assembly 9 is the force-receiving component for the rotational acting force of the attitude cylinder 3 and the spherical plugging head 1. The plugging head dynamic steering shaft assembly 9 moves along an arc trajectory around the plugging head rotating shaft assembly 7 under the action of the attitude cylinder 3. When the plugging head dynamic steering shaft assembly 9 rotates from the initial position to the end position, it is equivalent to the spherical plugging head 1 rotating 90°.

[0084] The pipe distributor 25 in the feeding device 2 and the oil and electric pipe distributor assembly 10 are the same component combination. The pipe distributor 25 is installed on the main support frame 21. Specifically, the oil and electric pipe distributor assembly 10 is installed between two main support frames 21 through the pipe distributor 25, and the oil and electric pipelines between the oil and electric pipe distributor assembly 10 and the spherical plugging head 1 swing along with the rotation of the spherical plugging head 1.

[0085] The attitude cylinder fixed shaft assembly 11 is installed between two main support frames 21. The attitude cylinder fixed shaft assembly 11 and the attitude cylinder 3 form a shaft-hole fit relationship. When the attitude cylinder 3 does work, as the attitude piston rod 37 of the attitude cylinder 3 extends or retracts, the rigid connection combination of the attitude cylinder body 31, the fixed earring 33, and the attitude piston rod 37 will rotate around the attitude cylinder fixed shaft assembly 11, and the combination of the attitude cylinder body 31, the fixed earring 33, and the attitude piston rod 37 in the attitude cylinder 3 forms a swinging attitude accordingly.

[0086] The upper joint of the hydraulic / electrical pipeline 12 is connected to the flange hatch cover 53, and the lower joint of the hydraulic / electrical pipeline 12 is fixed on the oil and electric pipe distributor assembly 10. The lower joints of the hydraulic / electrical pipeline 12 are respectively connected to the corresponding joints of the spherical plugging head 1 and the attitude cylinder 3. The hydraulic / electrical pipeline 12 is in contact with the medium in the pipeline.

[0087] The plugging connector 13 is a functional device in the entire plugging process equipment. The plugging connector 13 is assembled in conjunction with the gate valve 4, the oil-electric pipe cylinder 5, the main shaft of the hydraulic cylinder 14 and the manual-automatic control valve block 15.

[0088] The main shaft 14 of the hydraulic cylinder is one of the components of the hydraulic cylinder in the entire plugging process equipment, and the main shaft 14 of the hydraulic cylinder is installed on the second installation interface.

[0089] The manual-automatic control valve block 15 is installed on the plugging connector 13 or other workstations outside the pipeline. The manual-automatic control valve block 15 is a manual or automatic control instruction component and a status information receiving component. Its valve body is installed with hydraulic reversing valves, overflow valves, one-way valves, pressure sensors and other original components. The main oil supply port and oil return port of the manual-automatic control valve block 15 are connected to the corresponding interfaces of the hydraulic station 19 outside the pipeline. The electric control cable of the manual-automatic control valve block 15 is connected to the human-machine interaction console 18 outside the pipeline. The manual-automatic control valve block 15 is used for the control of the spherical plugging head 1 and the posture hydraulic cylinder 3.

[0090] The upper joint of the external hydraulic / electrical pipeline 16 is connected to the flange hatch 53 , the external hydraulic / electrical pipeline 16 is in contact with the atmosphere outside the pipeline, and the lower joint of the external hydraulic / electrical pipeline 16 is connected to the manual-automatic control valve block 15 .

[0091] One end of the off-pipe control cable 17 is connected to the corresponding electronic control component on the manual-automatic control valve block 15 , and the other end is connected to the off-pipe human-machine interaction console 18 .

[0092] The human-computer interaction console 18 outside the tube is a programmable human-computer interaction computer system. The human-computer interaction console 18 outside the tube is a control station for issuing instructions and feedback and processing of status information of the actuators inside the tube.

[0093] The external hydraulic station 19 is used as a hydraulic power source to provide active plugging hydraulic power for a double-sealed single-tube high-pressure plugger hydraulic system.

[0094] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A double-sealing and single-testing cavity plugging device, characterized in that, Comprising: A plugging adapter, having a feeding cavity; A feeding device, connected to the plugging adapter, the feeding device having a feeding hydraulic cylinder inserted into the feeding cavity; An oil-electric pipe cylinder, inserted into the feeding cavity; An attitude hydraulic cylinder, arranged in the feeding cavity; A spherical plugging head, including a setting hydraulic cylinder, a sealing assembly annularly arranged around the setting hydraulic cylinder, and a shower head for limiting the sealing assembly to the setting hydraulic cylinder. The setting hydraulic cylinder includes a setting hydraulic cylinder piston rod connected to the attitude hydraulic cylinder, and a setting hydraulic cylinder barrel sleeved on the setting hydraulic cylinder piston rod. The sealing assembly includes an upstream diameter snap ring axially arranged along the setting hydraulic cylinder piston rod, and an active retaining ring, an upstream sealing ring, a single test cavity ring, a downstream sealing ring, a passive retaining ring, and a downstream snap ring annularly arranged around the setting hydraulic cylinder barrel; The setting hydraulic cylinder barrel and the setting hydraulic cylinder piston rod jointly enclose a first pressurizing cavity and a second pressurizing cavity that are axially arranged along the setting hydraulic cylinder piston rod and are isolated from each other. Both the first pressurizing cavity and the second pressurizing cavity are communicated with the oil-electric pipe cylinder through an internal pipeline of the setting hydraulic cylinder piston rod; During the plugging process, the setting hydraulic cylinder barrel compresses the upstream sealing ring and the downstream sealing ring under the action of the medium in the pipeline to be plugged to passively plug the inner wall of the pipeline, and also uses the oil-electric pipe cylinder to drive the setting hydraulic cylinder barrel to compress the upstream sealing ring and the downstream sealing ring to actively plug the inner wall of the pipeline.

2. The double-sealed single-test cavity plugging device according to claim 1, characterized in that, It also includes: A snap ring connecting ring, annularly arranged around the setting hydraulic cylinder piston rod and clamped between the downstream snap ring and the shower head.

3. The double-sealing single-test cavity plugging device according to claim 1, wherein The upstream diameter snap ring is fixedly connected to the setting hydraulic cylinder piston rod; the plugging device also includes a displacement sensor arranged on the upstream diameter snap ring, the displacement sensor corresponds to the position of a magnetic ring installed on the setting hydraulic cylinder barrel, and the displacement sensor measures the displacement of the setting hydraulic cylinder barrel by detecting the position change of the magnetic ring.

4. A double-sealing and single-testing cavity plugging device according to claim 1, characterized in that, An air blowing circuit is arranged inside the setting hydraulic cylinder piston rod, and air holes are arranged on the shower head; The plugging device also includes an air blowing circuit joint connected to a gas generator, the air blowing circuit joint is installed at the air inlet of the air blowing circuit, and the air outlet of the air blowing circuit is connected to the air holes of the shower head.

5. The double-sealing single-test cavity plugging device according to claim 1, characterized in that, The feeding device includes two relatively arranged main supports that are respectively connected to the plugging adapter and inserted into the feeding cavity; the feeding device also includes a plugging head rotating shaft arranged in the feeding cavity and rotatably connected to the setting hydraulic cylinder piston rod, an attitude cylinder fixed shaft arranged in the feeding cavity and rotatably connected to the attitude hydraulic cylinder, a knife edge support ring arranged on the main support and used for supporting at the knife edge of the pipeline opening, a support ring arranged on the main support and in clearance fit with the plugging adapter, and a first installation socket arranged on the main support and inserted with the oil-electric pipe cylinder.

6. The double-sealed single-test cavity plugging device according to claim 5, wherein, It also includes: A plugging head limiting rod assembly, arranged in the feeding cavity and used for limiting the position of the spherical plugging head.

7. A double-sealed single-test cavity plugging device according to claim 1, characterized in that, The attitude hydraulic cylinder includes an attitude hydraulic cylinder body, an electromagnetic chamber housing arranged on the attitude hydraulic cylinder body, a fixed earring arranged on the electromagnetic chamber housing, a steering displacement sensor arranged in the electromagnetic chamber housing, an attitude piston rod arranged in the attitude hydraulic cylinder body, a magnetic rod arranged in the attitude hydraulic cylinder body and connected to the attitude piston rod, and a moving earring arranged on the attitude piston rod and used for connecting with the spherical plug head.

8. A double-seal single-test cavity plugging device according to claim 1, characterized in that, It further includes: A gate valve, which is arranged on the outer periphery of the feeding device and is hermetically connected to the plugging adapter.

9. A double-sealed single-test cavity plugging device according to claim 1, characterized in that, The oil-electric pipe cylinder includes a main pipe cylinder body inserted into the feeding cavity, a scale assembly arranged on the main pipe cylinder body, a flange hatch cover hermetically connected to the main pipe cylinder body, a pipe cylinder top hatch assembly connected to the flange hatch cover, an oil and gas pipe assembly and a control cable assembly arranged on the pipe cylinder top hatch assembly, and a sealing steel ring hermetically connected between the flange hatch cover and the pipe cylinder top hatch assembly.

10. A double-sealed single-test cavity plugging device according to claim 5, characterized in that, It further includes: A second installation socket, which is arranged on the main support frame; A feeding hydraulic cylinder main shaft, which is inserted into the feeding cavity and plugged into the second installation socket, and the feeding hydraulic cylinder main shaft is used to drive the feeding device to move.

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