Double-seal single-test-chamber occluder

Abstract

The embodiment of the present disclosure provides a double-sealing single-test-chamber plugging device, and belongs to the technical field of pipeline maintenance and repair, which comprises a plugging adapter, a feeding device connected with the plugging adapter, the feeding device being provided with a feeding hydraulic cylinder, an oil-electric hydraulic cylinder being arranged in the feeding cavity, a posture hydraulic cylinder being arranged in the feeding cavity, a spherical plugging head comprising a setting hydraulic cylinder, a sealing assembly and a shower head, the setting hydraulic cylinder comprising a setting hydraulic cylinder piston rod and a setting hydraulic cylinder barrel, the sealing assembly comprising an upstream radial snap ring, a driving retainer ring, an upstream sealing ring, a single-test-chamber ring, a downstream sealing ring, a driven retainer ring and a downstream snap ring which are arranged around the setting hydraulic cylinder barrel, and the setting hydraulic cylinder barrel and the setting hydraulic cylinder piston rod surrounding a first pressurizing cavity and a second pressurizing cavity which are arranged along the axial direction of the setting hydraulic cylinder piston rod and are separated from each other. In the present application, the spherical plugging head is used for plugging along the flow direction of the medium in the pipeline, and through the double plugging of active plugging and passive plugging, the problems of pipeline micro-leakage and micro-permeation can be effectively solved.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the field of pipeline maintenance and repair technology, specifically relating to a double-sealed single-chamber plugging device. Background Technology

[0002] During maintenance and emergency repairs of oil and gas pipelines involving high / low pressure sealing, the commonly used sealing devices in China are currently suspended sealing devices. When sealing the medium inside the pipeline, the suspended sealing device relies on a rubber sealing ring to block the high-pressure medium and form a seal. Its sealing principle involves pre-setting the interference fit between the rubber ring and the inner wall of the pipe. In other words, the high interference fit of the sealing ring is forcibly inserted into the pipe, causing it to contact the inner wall and create pressure, thus achieving a seal. This sealing effect is achieved through the interference fit principle of the rubber ring and the subsequent deformation and compression of the sealing ring under the auxiliary force of the medium itself.

[0003] Suspended plugs have been in use for decades and are the main equipment for high-pressure / low-pressure plugging operations on in-service pipelines in China. This plugging technology is called "suspended plug passive plugging technology".

[0004] Because the structure and sealing characteristics of suspended plugs belong to passive plugging technology, micro-leakage and micro-seepage problems have persisted in actual operation for many years. Therefore, how to solve these problems has become a technical issue that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0005] The embodiments disclosed herein are intended to at least address one of the technical problems existing in the prior art, and to provide a dual-seal single-chamber plugging device.

[0006] One aspect of the embodiments of this disclosure provides a dual-seal single-chamber plugging device, comprising:

[0007] The sealing connector has an inlet cavity;

[0008] A feeding device is connected to the sealing connector, and the feeding device has a feeding hydraulic cylinder inserted into the feeding chamber;

[0009] The hydraulic cylinder is inserted into the feed chamber;

[0010] A posture hydraulic cylinder is disposed in the feed chamber;

[0011] A spherical sealing head includes a setting hydraulic cylinder, a sealing assembly annularly disposed around the setting hydraulic cylinder, and a shower head that confines the sealing assembly within the setting hydraulic cylinder. The setting hydraulic cylinder includes a setting hydraulic cylinder piston rod connected to the posture hydraulic cylinder and a setting hydraulic cylinder barrel sleeved on the setting hydraulic cylinder piston rod. The sealing assembly includes an upstream retaining ring arranged axially along the setting hydraulic cylinder piston rod and an active retaining ring, an upstream sealing ring, a single test chamber ring, a downstream sealing ring, a passive retaining ring, and a downstream retaining ring annularly disposed around the setting hydraulic cylinder barrel.

[0012] The setting hydraulic cylinder barrel and the setting hydraulic cylinder piston rod together form a first pressurizing chamber and a second pressurizing chamber that are arranged axially along the setting hydraulic cylinder piston rod and isolated from each other. The first pressurizing chamber and the second pressurizing chamber are both connected to the hydraulic cylinder through the internal pipeline of the setting hydraulic cylinder piston rod.

[0013] During the sealing process, the setting hydraulic cylinder compresses the upstream and downstream sealing rings under the action of the medium in the pipeline to be sealed to passively seal the inner wall of the pipeline. In addition, the hydraulic cylinder drives the setting hydraulic cylinder to compress the upstream and downstream sealing rings to actively seal the inner wall of the pipeline.

[0014] Furthermore, it also includes: a retaining ring, which is ringed around the piston rod of the seated hydraulic cylinder and sandwiched between the downstream retaining ring and the shower head.

[0015] Optionally, the upstream diameter retaining ring is fixedly connected to the piston rod of the setting hydraulic cylinder; the plug also includes a displacement sensor disposed on the upstream diameter retaining ring, the displacement sensor being positioned corresponding to the magnetic ring installed on the setting hydraulic cylinder barrel, and the displacement sensor measuring the displacement of the setting hydraulic cylinder barrel by detecting the position change of the magnetic ring.

[0016] Optionally, the piston rod of the setting hydraulic cylinder is provided with an air blowing circuit, and the shower head is provided with air holes;

[0017] The plug also includes an air-blowing circuit connector connected to a gas generator. The air-blowing circuit connector 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 hole of the shower head.

[0018] Optionally, the feeding device includes two main support frames arranged opposite to each other and respectively connected to the sealing connector and inserted into the feeding cavity; the feeding device also includes a sealing head rotating shaft disposed in the feeding cavity and rotatably connected to the piston rod of the setting hydraulic cylinder, an attitude cylinder fixing shaft disposed in the feeding cavity and rotatably connected to the attitude hydraulic cylinder, a knife edge support ring disposed in the main support frame and used to support the pipe opening knife edge, a support ring disposed in the main support frame and clearance-fitted with the sealing connector, and a first mounting interface disposed in the main support frame and inserted into the hydraulic cylinder.

[0019] Furthermore, it also includes: a sealing head limiting rod assembly, which is disposed in the feeding cavity and is used to limit the position of the spherical sealing head.

[0020] Optionally, the attitude hydraulic cylinder includes an attitude hydraulic cylinder body, an electromagnetic chamber housing disposed on the attitude hydraulic cylinder body, a fixed lug disposed on the electromagnetic chamber housing, a steering displacement sensor disposed inside the electromagnetic chamber housing, an attitude piston rod disposed inside the attitude hydraulic cylinder body, a magnetic rod disposed inside the attitude hydraulic cylinder body and connected to the attitude piston rod, and a movable lug disposed on the attitude piston rod and used for connecting to the spherical sealing head.

[0021] Furthermore, it also includes: a gate valve, which is disposed on the outer periphery of the feeding device and is sealed and connected to the sealing connector.

[0022] Optionally, the oil-electric cylinder includes a main cylinder body inserted into the feed chamber, a scale assembly disposed on the main cylinder body, a flange cover sealed and connected to the main cylinder body, a top chamber assembly of the oil cylinder connected to the flange cover, an oil and gas pipe assembly and a control cable assembly disposed on the top chamber assembly of the oil cylinder, and a sealing steel ring sealingly connected between the flange cover and the top chamber assembly of the oil cylinder.

[0023] Furthermore, it also includes: a second mounting interface, the second mounting interface being disposed on the main support frame;

[0024] The feed hydraulic cylinder spindle is inserted into the feed cavity and connected to the second mounting interface. The feed hydraulic cylinder spindle is used to drive the feed device to move.

[0025] The beneficial effects of the embodiments of this disclosure include:

[0026] In this invention, the spherical plugging head seals along the flow direction of the medium in the pipeline, and through dual sealing methods such as active and passive sealing, it can effectively solve the problems of micro-leakage and micro-seepage in the pipeline. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a dual-seal single-chamber plugging device according to an embodiment of the present disclosure;

[0028] Figure 2 This is a schematic diagram of the structure of a spherical plug according to an embodiment of the present disclosure, wherein the lower part of the spherical plug is shown in a cross-sectional view;

[0029] Figure 3 This is a schematic diagram of the structure of a feeding device according to an embodiment of the present disclosure;

[0030] Figure 4 This is a cross-sectional schematic diagram of a posture hydraulic cylinder according to an embodiment of the present disclosure;

[0031] Figure 5 This is a schematic diagram of the structure of an electric hydraulic cylinder according to an embodiment of the present disclosure;

[0032] Figure 6 This is a cross-sectional view of the oil-electric pipe cylinder along section AA, according to an embodiment of the present disclosure.

[0033] In the diagram, 1. Spherical plug head; 2. Feeding device; 3. Attitude hydraulic cylinder; 4. Gate valve; 5. Hydraulic-electric cylinder; 6. Plug head limit rod assembly; 7. Plug head rotating shaft assembly; 8. Plug head steering arm; 9. Plug head dynamic steering shaft assembly; 10. Hydraulic-electric pipe laying assembly; 11. Attitude cylinder fixed shaft assembly; 12. Hydraulic / electrical pipeline; 13. Plug connector; 14. Feeding hydraulic cylinder main shaft; 15. Manual / automatic control valve block; 16. External hydraulic / electrical pipeline; 17. External control cable; 18. External human-machine interface control console; 19. External hydraulic station; 111. Shower head; 112. Snap ring connector; 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. Upper... 131. Traveling circumferential retaining ring; 1111. Feed chamber; 1112. Displacement sensor; 1113. Air blow circuit connector; 1114. Circumferential limiter; 1115. Setting hydraulic cylinder piston rod; 1116. Setting hydraulic cylinder barrel; 21. Main support frame; 22. Sealing head rotating shaft; 23. Main shaft member; 24. Knife edge support ring; 25. Pipe laying tool; 26. Attitude cylinder fixing shaft; 27. Support ring; 28. First mounting interface; 31. Attitude hydraulic cylinder body; 32. Electromagnetic chamber shell; 33. Fixing clevis; 34. Electrical cable; 35. Steering displacement sensor; 36. Magnetic rod; 37. Attitude piston rod; 38. Moving clevis; 51. Oil pipe cylinder main cylinder body; 52. Scale assembly; 53. Flange cover; 54. Oil pipe cylinder top chamber assembly; 55. Oil and gas pipe assembly; 56. Control cable assembly; 57. Sealing steel ring. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed 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.

[0036] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0037] like Figure 1-2 As shown, a double-sealed single-chamber plugging device includes a plugging connector 13, a feeding device 2, an electric hydraulic cylinder 5, a posture hydraulic cylinder 3, and a spherical plugging head 1. The plugging connector 13 has a feeding chamber 131. The feeding device 2 is connected to the plugging connector 13. The feeding device 2 has a feeding hydraulic cylinder inserted into the feeding chamber 131. The electric hydraulic cylinder 5 is inserted into the feeding chamber 131, and the posture hydraulic cylinder 3 is disposed in the feeding chamber 131.

[0038] The spherical sealing head 1 includes a setting hydraulic cylinder, a sealing assembly surrounding the setting hydraulic cylinder, and a shower head 111 that confines the sealing assembly within the setting hydraulic cylinder. The setting hydraulic cylinder includes a setting hydraulic cylinder piston rod 1114 connected to the posture 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 retaining ring 119 arranged axially along the setting hydraulic cylinder piston rod 1114, and an active retaining ring 118, an upstream sealing ring 117, a single test chamber ring 116, a downstream sealing ring 115, a passive retaining ring 114, and a downstream retaining ring 113 surrounding the setting hydraulic cylinder barrel 1115.

[0039] The setting hydraulic cylinder barrel 1115 and the setting hydraulic cylinder piston rod 1114 together form a first pressurizing chamber 1116 and a second pressurizing chamber 1117 arranged axially along the setting hydraulic cylinder piston rod 1114 and isolated from each other. The first pressurizing chamber 1116 and the second pressurizing chamber 1117 are both connected to the hydraulic cylinder 5 through the internal pipeline of the setting hydraulic cylinder piston rod 1114.

[0040] During the sealing process, the setting hydraulic cylinder 1115 compresses the upstream sealing ring 117 and the downstream sealing ring 115 under the action of the medium in the pipeline to be sealed to passively seal the inner wall of the pipeline. In addition, the hydraulic cylinder 5 drives the setting hydraulic cylinder 1115 to compress the upstream sealing ring 117 and the downstream sealing ring 115 to actively seal the inner wall of the pipeline.

[0041] Specifically, during the driving process, high-pressure oil in the hydraulic cylinder 5 is injected into the second pressurizing chamber 1117, causing the setting hydraulic cylinder 1115 to move along the direction of the medium flow 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 is expanded), thereby compressing the upstream sealing ring 117 and the downstream sealing ring 115. Conversely, high-pressure oil in the hydraulic cylinder 5 is injected into the first pressurizing chamber 1116, causing the setting hydraulic cylinder 1115 to move against the direction of the medium flow in the pipeline (at this time, the space of the first pressurizing chamber 1116 is expanded, and the space of the second pressurizing chamber 1117 is compressed), thereby causing the upstream sealing ring 117 and the downstream sealing ring 115 to contact and compress. During this process, the second pressurizing chamber 1117 releases pressure.

[0042] In this invention, the spherical plug head 1 seals the pipe in the direction of medium flow, and through the dual sealing of active and passive sealing, the problem of micro-leakage and micro-seepage in the pipe can be effectively solved.

[0043] In some embodiments, the plugging device further includes a retaining ring 112, which is annularly disposed around the piston rod 1114 of the setting hydraulic cylinder and sandwiched between the downstream retaining ring 113 and the shower head 111. The retaining ring 112 is used to secure the downstream retaining ring 113 and prevent the downstream retaining ring 113 from disintegrating.

[0044] In some embodiments, the upstream diameter retaining ring 119 is fixedly connected to the piston rod 1114 of the setting hydraulic cylinder. The plug also includes a displacement sensor 1111 disposed on the upstream diameter retaining ring 119. The displacement sensor 1111 corresponds to the position of the magnetic ring installed on the setting hydraulic cylinder 1115. The displacement sensor 1111 measures the displacement of the setting hydraulic cylinder 1115 by detecting the position change of the magnetic ring.

[0045] In this invention, by setting a displacement sensor 1111 on the upstream diameter retaining ring 119 and cooperating with a magnetic ring installed on the setting hydraulic cylinder 1115, accurate measurement of the displacement of the setting hydraulic cylinder 1115 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, allowing operators or control systems to adjust the equipment status in a timely manner and ensure the smooth progress of the sealing operation.

[0046] In some embodiments, an air-blowing circuit 11141 is provided inside the piston rod 1114 of the setting hydraulic cylinder, and an air hole is provided in the shower head 111. The sealing device also includes an air-blowing circuit connector 1112 connected to a gas generator. The air-blowing circuit connector 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 hole of the shower head 111.

[0047] In this invention, high-pressure gas is sprayed from the shower head 111 and the air-blowing circuit connector 1112, effectively removing dust, debris (iron filings), and other impurities from the inner wall of the pipe, ensuring a clean and tidy working environment before the sealing operation. The cleaned inner wall of the pipe can better contact the sealing head, enhancing sealing performance and reducing the risk of leakage. During the sealing process, the high-pressure gas can continuously purge the working area, preventing external impurities or residues from entering the sealing system and avoiding equipment failure due to foreign object blockage.

[0048] In some embodiments, reference is made to Figure 3 The feeding device 2 includes two main support frames 21 that are arranged opposite to each other and connected to the sealing connector 13 and inserted into the feeding cavity 131. The feeding device 2 also includes a sealing head rotating shaft 22 that is arranged in the feeding cavity 131 and rotatably connected to the piston rod 1114 of the setting hydraulic cylinder, an attitude cylinder fixing shaft 26 that is arranged in the feeding cavity 131 and rotatably connected to the attitude hydraulic cylinder 3, a knife edge support ring 24 that is arranged in the main support frame 21 and used to support the pipe opening knife edge, a support ring 27 that is arranged in the main support frame 21 and clearance-fitted with the sealing connector 13, and a first mounting interface 28 that is arranged in the main support frame 21 and inserted into the oil and electricity cylinder 5.

[0049] In some embodiments, the plugging device further includes a plugging head limiting rod assembly 6, which is disposed in the feed cavity 131 and is used to limit the position of the spherical plugging head 1.

[0050] In this invention, the sealing head limiting rod assembly 6 is disposed within the feeding cavity 131 and is used to limit the position of the spherical sealing head 1, ensuring that the sealing head maintains an accurate position during operation, which is beneficial for achieving high-precision sealing operations. By limiting the movement range of the sealing head, positional deviations caused by external interference or improper operation can be effectively reduced, thereby improving the success rate and reliability of sealing operations.

[0051] In some embodiments, reference is made to Figure 4 The attitude hydraulic cylinder 3 includes an attitude hydraulic cylinder body 31, an electromagnetic chamber housing 32 disposed on the attitude hydraulic cylinder body 31, a fixed ear ring 33 disposed on the electromagnetic chamber housing 32, a steering displacement sensor 35 disposed inside the electromagnetic chamber housing 32, an attitude piston rod 37 disposed inside the attitude hydraulic cylinder body 31, a magnetic rod 36 disposed inside the attitude hydraulic cylinder body 31 and connected to the attitude piston rod 37, and a moving ear ring 38 disposed on the attitude piston rod 37 and used for connecting to the spherical sealing head 1.

[0052] In some embodiments, the plugger also includes a gate valve 4, which is disposed on the outer periphery of the feeding device 2 and is sealed to the plugging connector 13.

[0053] In this invention, the sealed connection between the gate valve 4 and the plugging connector 13 ensures that no leakage occurs during operation, maintaining stable system pressure. During the plugging process, the gate valve 4 effectively isolates the medium within the pipeline, preventing leakage into the external environment, protecting operator safety, and reducing the risk of environmental pollution. The gate valve 4 can be closed before plugging operations to isolate the area to be plugged from the external system, avoiding accidents caused by medium flow and improving operational safety. In case of emergencies, the flow of medium can be cut off by quickly closing the gate valve 4, rapidly controlling the situation and reducing potential hazards.

[0054] In some embodiments, reference is made to Figure 5-6 The oil-electric cylinder 5 includes a main cylinder body 51 inserted into the feed chamber 131, a scale assembly 52 disposed on the main cylinder body 51, a flange cover 53 connected to the main cylinder body 51, a top chamber assembly 54 connected to the flange cover 53, an oil and gas pipe assembly 55 and a control cable assembly 56 disposed on the top chamber assembly 54, and a sealing steel ring 57 sealingly connected between the flange cover 53 and the top chamber assembly 54.

[0055] In some embodiments, the plugger further includes a second mounting interface 29 and a feed hydraulic cylinder spindle 14. The second mounting interface 29 is disposed on the main support frame 21, and the feed hydraulic cylinder spindle 14 is inserted into the feed cavity 131 and connected to the second mounting interface 29. The feed hydraulic cylinder spindle 14 is used to drive the feed device 2 to move.

[0056] In this invention, the feed hydraulic cylinder spindle 14 is fixed to the main support frame 21 via the second mounting interface 29, and can drive the feed device 2 to move along 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 in the pipeline. Because the feed hydraulic cylinder spindle 14 can provide a stable and controllable driving force, it reduces positional deviations caused by manual operation or mechanical errors, and improves the accuracy of the plugging operation.

[0057] One specific example provided in this disclosure includes:

[0058] Specifically, such as Figure 1 As shown, a double-sealed single-chamber plugging device includes: a spherical plugging head 1, a feeding device 2, a posture 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 laying device assembly 10, a posture cylinder fixing shaft assembly 11, hydraulic / electrical pipelines 12, a plugging connector 13, a feeding hydraulic cylinder main shaft 14, a manual / automatic integrated control valve block 15, external hydraulic / electrical pipelines 16, external control cables 17, an external human-machine interface control console 18, and an external hydraulic station 19.

[0059] like Figure 2 As shown, the spherical sealing head 1 includes a shower head 111, a retaining ring 112, a downstream retaining ring 113, a passive retaining ring 114, a downstream sealing ring 115, a single test chamber ring (also called a single test pressure ring chamber) 116, an upstream sealing ring 117, an active retaining ring 118, an upstream diameter retaining ring 119, a displacement sensor 1111, an air blowing circuit connector 1112, a circumferential limiter 1113, a setting hydraulic cylinder piston rod 1114, and a setting hydraulic cylinder barrel 1115.

[0060] Specifically, the shower head 111 is bolted to the piston rod 1114 of the setting hydraulic cylinder. The shower head 111 has a fan-shaped array of exhaust holes. The piston rod 1114 of the setting hydraulic cylinder is equipped with an air blowing circuit 11141. The air blowing circuit 11141 is connected to the air hole. The shower head 111 is connected to the air blowing circuit connector 1112 through the air blowing circuit 11141 and the air hole, and is connected to the gas generator through the air blowing circuit connector 1112.

[0061] High-pressure gas is introduced through the air blowing circuit connector 1112, and a fan-shaped air knife is generated through the fan-shaped array exhaust holes of the shower head 111 to blow away the iron filings in the opening.

[0062] In some embodiments, an O-ring is provided between the shower head 111 and the piston rod 1114 of the setting hydraulic cylinder to seal the connection between them. The O-ring prevents the contact between the shower head 111 and the piston rod 1114 and the medium inside the pipe. A retaining ring 112 is used to secure the downstream retaining ring 113, preventing it from disintegrating.

[0063] The downstream retaining ring 113 is a split retaining ring or an integral retaining ring. The downstream retaining ring 113 is used to prevent the passive retaining ring 114 from axially displacing within the spherical sealing head 1.

[0064] The outer diameter of the passive retaining ring 114 is in clearance fit with the inner wall of the pipe. The smaller the clearance, the less deformation of the downstream sealing ring 115 and the less leakage.

[0065] The downstream sealing ring 115 is the second sealing ring in the sealing assembly and is also a component of the double-seal single-chamber plugger. When it is working, it is located in the pipeline where the medium flows downstream.

[0066] A single test chamber ring (also called a single test pressure ring cavity) 116 is installed between the downstream sealing ring 115 and the upstream sealing ring 117. The downstream sealing ring 115, the single test chamber ring 116 and the upstream sealing ring 117 together form a double-seal single test pressure ring cavity structure.

[0067] The single test chamber ring is provided with an annular cavity hole, which is connected to the hole of the spherical plug head 1 and then to the pressure gauge or pressure sensor outside the pipeline. The sealing effect of the downstream sealing ring 115 and the upstream sealing ring 117 can be judged by two methods: unloading the medium pressure in the single test chamber ring and pressurizing after filling the single test chamber ring with medium.

[0068] The upstream sealing ring 117 is the first sealing ring in the sealing assembly and is also a component of the double-sealed single-chamber plug. When it is working, it is located in the pipeline where the medium flows upstream.

[0069] The active retaining ring 118 plays a role in pushing and squeezing the upstream sealing ring 117 to move axially within the structure. The outer diameter of the upstream active retaining ring 118 is in clearance fit with the inner wall of the pipe. The smaller the clearance, the less deformation of the upstream sealing ring 117 and the less clearance overflow.

[0070] The upstream diameter retaining ring 119 is fixed to the piston rod 1114 of the setting hydraulic cylinder. The upstream diameter retaining ring 119 is a split retaining ring, or it can be a one-piece retaining ring. The upstream diameter retaining ring 119 serves to prevent axial displacement of the setting hydraulic cylinder 1115. A displacement sensor 1111 and a circumferential limiter 1113 are installed on the upstream diameter retaining ring 119. Specifically, the upstream diameter retaining ring 119 and the downstream retaining ring 113 are located at opposite axial ends of the setting hydraulic cylinder 1115. The upstream diameter retaining ring 119 serves as the mounting carrier for the displacement sensor 1111 and the circumferential limiter 1113.

[0071] The electromagnetic chamber and magnetic rod assembly of displacement sensor 1111 are fixedly installed on upstream diameter retaining ring 119. When the magnetic ring located on the setting hydraulic cylinder 1115 moves, displacement sensor 1111 is used to measure the displacement between the piston rod 1114 and the setting hydraulic cylinder 1115.

[0072] The air blow circuit connector 1112 is installed at the air inlet of the air blow circuit 11141 of the piston rod 1114 of the set hydraulic cylinder. The upstream of the air blow circuit connector 1112 is connected to the air pipe to the gas generator outside the pipeline, and the downstream is connected to the air hole of the shower head 111 through the air blow circuit of the piston rod 1114 of the set hydraulic cylinder.

[0073] The circumferential limiter 1113 is installed on the upstream diameter retaining ring 119 and fixed on the piston rod 1114 of the setting hydraulic cylinder. The circumferential limiter 1113 serves to prevent the upstream diameter retaining ring 119 and the setting hydraulic cylinder barrel 1115 from rotating circumferentially, and also to protect the magnetic rod of the displacement sensor 1111.

[0074] The piston rod 1114 of the setting hydraulic cylinder is rotatably connected to the rotating shaft assembly 7 of the sealing head. A piston of the setting hydraulic cylinder is mounted on the piston rod 1114; the piston and piston rod on the setting hydraulic cylinder piston rod 1114 can be separate components or integrally formed. The piston rod 1114 and the setting hydraulic cylinder barrel 1115 constitute the setting hydraulic cylinder. The piston rod 1114 of the setting hydraulic cylinder cooperates with the rotating shaft assembly 7 of the sealing head and rotates around the rotating shaft assembly 7.

[0075] The sealing head steering arm 8 is installed on the piston rod 1114 of the setting hydraulic cylinder, and the sealing head dynamic steering shaft assembly 9 is installed on the sealing head steering arm 8 and then connected to the attitude hydraulic cylinder 3.

[0076] Downstream retaining ring 113, passive retaining ring 114, downstream sealing ring 115, single test chamber ring 116, upstream sealing ring 117 and active retaining ring 118 are sequentially 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. The setting hydraulic cylinder piston rod 1114 is fixed and stationary in the setting hydraulic cylinder barrel 1115, while the setting hydraulic cylinder barrel 1115 slides relative to the setting hydraulic cylinder piston rod 1114.

[0077] The feeding device 2 includes a main support frame 21, a sealing head rotating shaft 22, a main shaft rod 23, a knife edge support ring 24, a pipe laying device 25, a posture cylinder fixing shaft 26, a support ring 27, a first mounting interface 28, and a second mounting interface 29.

[0078] The main support frame 21 is used to install the plug head rotating shaft assembly 7, the plug head limiting rod assembly 6, the knife edge support ring 24, the oil and electricity pipe laying device assembly 10, the attitude cylinder fixing shaft assembly 11, the support ring 27, the first mounting interface 28, and the second mounting interface 29. The main support frame 21 is the mounting carrier for the above-mentioned components and also the mounting carrier for 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.

[0079] The force on the spherical plug head 1 is transmitted to the feeding device 2. The knife-edge support ring 24 and the support ring 27 on the feeding device 2 are the main force support points. The knife-edge support ring 24 and the support ring 27 ensure the static balance of the spherical plug head 1 after being subjected to force.

[0080] The sealing head rotating shaft 22 is the main rotating shaft in the sealing head rotating shaft assembly 7. The sealing head rotating shaft 22 is used to install the spherical sealing head 1. The spherical sealing head 1 rotates around the sealing head rotating shaft 22. The sealing head rotating shaft 22 is the force-bearing support body of the spherical sealing head 1. After the sealing head rotating shaft 22 is subjected to force, it transmits the force to the main shaft member 23, the knife edge support ring 24 and the support ring 27.

[0081] The main spindle 23 is the main spindle of the sealing head limiting rod assembly 6. The main spindle 23 bears the upward component of the piston rod 1114 of the setting hydraulic cylinder in the spherical sealing head 1, and at the same time transmits the force to the main support frame 21.

[0082] 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 the force. The support point acts on the opening knife edge, and the contact point with the knife edge is actually a saddle-shaped linear contact surface. The contact area is related to the pipe wall thickness and linear spiral length.

[0083] Pipe arranger 25 is the main pipe laying device of the oil and electricity pipe laying assembly 10, such as Figure 3As described in the description, the pipe laying device 25 is installed on the main support frame 21 and lays the oil and electricity pipes. The pipe laying device 25 is installed between the two main support frame bodies. As the spherical plug head 1 rotates, the oil and electricity pipes between the oil and electricity pipe laying device assembly 10 and the spherical plug head 1 also swing.

[0084] The attitude cylinder fixing shaft 26 is the fixing shaft of the attitude cylinder fixing shaft assembly 11. The attitude cylinder fixing shaft 26 is used to install the fixing lug 33 of the attitude hydraulic cylinder 3. The cylinder body of the attitude hydraulic cylinder 3 swings around the attitude cylinder fixing shaft 26. The attitude cylinder fixing shaft 26 bears the tension and thrust of the attitude hydraulic cylinder 3. The load of the attitude hydraulic cylinder 3 is the sealing head steering arm 8.

[0085] The support ring 27 is located at the upper end of the main support frame 21. The outer diameter of the support ring 27 is fitted with the inner diameter of the paper strip of the sealing connector 13. When the spherical sealing head 1 and the feeding device 2 enter and exit the pipeline, the support ring 27 plays a guiding and centering role. When the force of the spherical sealing head 1 is transmitted to the feeding device 2, the support ring 27 also plays the role of a force support point.

[0086] The first mounting interface 28 is connected to the hydraulic cylinder 5, and the second mounting interface 29 is connected to the feed hydraulic cylinder spindle 14. Both the first mounting interface 28 and the second mounting interface 29 are connected to the main support frame 21 through a tenon and mortise structure and reinforced with bolts.

[0087] The attitude hydraulic cylinder 3 includes an attitude hydraulic cylinder body 31, an electromagnetic chamber housing 32, a fixed ear ring 33, an electrical cable 34, a steering displacement sensor 35, a magnetic rod 36, an attitude piston rod 37, and a moving ear ring 38.

[0088] The attitude hydraulic cylinder 3 is an integral structure used to adjust the steering angle of the spherical sealing head 1. The attitude hydraulic cylinder 3 consists of the cylinder body 31 and the attitude piston rod 37. The electromagnetic housing 32 is mounted on the cylinder body 31 of the attitude hydraulic cylinder, and a displacement sensor for measuring the attitude of the attitude hydraulic cylinder 3 is installed inside the electromagnetic housing 32.

[0089] The fixed earring 33 is mounted on the electromagnetic housing shell 32. The electrical cable 34 connects to the steering displacement sensor 35 and passes through the cable hole of the electromagnetic housing shell 32. The steering displacement sensor 35 and the magnetic rod 36 (sensor magnetic rod) constitute the steering displacement sensor 35 assembly. The movable earring 38 is mounted on the attitude piston rod 37. After the attitude piston rod 37 performs work in the cylinder body 31 of the attitude hydraulic cylinder, the attitude piston rod 37 extends and retracts. The movement of the attitude piston rod 37 interferes with the magnetic field of the magnetic rod 36 and produces a hysteresis effect. Therefore, an angle algorithm is generated in the steering displacement sensor 35 and the real-time angle attitude of the spherical sealing head 1 is obtained through the output of the current value.

[0090] The sealing connector 13 is installed on the gate valve 4, which is a gate valve 4 for maintenance and emergency repair. The gate valve 4 is installed on the sealing tee for maintenance and emergency repair. The sealing connector 13, the gate valve 4 and the sealing tee form a sealed feed chamber 131.

[0091] The oil-electric cylinder 5 includes the main cylinder body 51, the scale assembly 52, the flange cover 53, the top compartment assembly 54, the oil and gas pipe assembly 55, the control cable assembly 56, and the sealing steel ring 57.

[0092] The main cylinder 51 of the oil pipe cylinder provides oil and electricity to the ball lamp sealing head. The oil / electric pipes that need to be configured are connected to the oil / electric pipe cylinder 5 to achieve the wall penetration technology and matching structure under the pressure difference environment of the medium inside and outside the pipeline. The oil / electric pipes outside the pipeline are connected to the oil / electric pipe laying device assembly 10 through the oil / electric pipe cylinder 5 for secondary fixation.

[0093] The scale assembly 52 is installed on the main cylinder body 51 of the oil pipe cylinder. When the main shaft 14 of the feed hydraulic cylinder drives the feed device 2 to move, the main cylinder body 51 of the oil pipe cylinder will move at the same time. The movement trajectory of the scale assembly 52 is reflected on the outer shell of the feed hydraulic cylinder in real time, so that the accurate position of the spherical plug head 1 entering or exiting the pipeline can be measured.

[0094] The flange cover 53 acts on the oil and gas pipe assembly 55 and the control cable assembly 56. The flange cover 53 (installed on the oil pipe cylinder) and the main cylinder body 51 of the oil pipe cylinder form a flange sealing structure system. The flange cover 53 can also be characterized as a through-wall blind flange cover. An oil / electric interface is arranged on this flange cover, and the interface and the oil / electric connector are connected by a threaded sealing combination. The oil / electric pipes on the inner side of the flange cover 53 and the main cylinder body 51 of the oil pipe cylinder are in communication with the medium inside the pipeline, while the other side is exposed to the atmospheric environment.

[0095] The top compartment assembly 54 of the tubing cylinder provides impact protection and secures the tubing / cables to the oil / gas tubing assembly 55 and control cable assembly 56. The joints and matching oil / gas tubing assemblies of the oil / gas tubing assembly 55 are installed on the inner and outer sides of the flange cover 53, respectively, with joint sealing characteristics at the installation points. The socket joints and matching control cable assemblies of the control cable assembly 56 are installed on the inner and outer sides of the flange cover 53, respectively, with joint sealing characteristics at the installation points. A sealing steel ring 57 is installed between the flange of the main cylinder body 51 of the tubing cylinder and the flange cover 53, serving a sealing function.

[0096] The plugging head limiting rod assembly 6 is installed on the feeding device 2. The main shaft member 23 in the plugging head limiting rod assembly 6 is the main shaft of the plugging head limiting rod assembly 6. The main shaft member 23 bears the upward component of the piston rod 1114 of the setting hydraulic cylinder in the spherical plugging head 1, and at the same time transmits the force to the feeding device 2, so as to prevent the spherical plugging head 1 from tilting upward and affecting the sealing performance of the downstream sealing ring 115 and the upstream sealing ring 117.

[0097] The plugging head rotating shaft assembly 7 is mounted on the feeding device 2. The main shaft in the plugging head rotating assembly is used to install the plugging head steering arm 8 connected to the spherical plugging head 1. The plugging head steering arm 8 and the spherical plugging head 1 are rigidly connected.

[0098] The spherical plug head steering arm 8 is rigidly connected to the piston rod 1114 of the setting hydraulic cylinder in the spherical plug head 1. The center line of the hole on the spherical plug head steering arm 8 maintains a fixed positional relationship with the axis of the piston rod 1114 of the setting hydraulic cylinder. The hole in the spherical plug head steering arm 8 and the main shaft of the spherical plug head rotating shaft assembly 7 form a shaft-hole fit. The force of the attitude hydraulic cylinder 3 is applied to the dynamic steering shaft assembly 9 of the spherical plug head, generating a rotational torque between the dynamic steering shaft assembly 9 and the rotating shaft assembly 7, thereby driving the spherical plug head 1 to rotate around the rotating shaft assembly 7.

[0099] The dynamic steering shaft of the plugging head is mounted on the steering arm 8 of the plugging head. The dynamic steering shaft assembly 9 of the plugging head and the moving lug 38 of the attitude hydraulic cylinder 3 form a shaft-hole fit relationship. The dynamic steering shaft assembly 9 of the plugging head is the force-bearing component for the rotation of the attitude hydraulic cylinder 3 and the spherical plugging head 1. Under the action of the attitude hydraulic cylinder 3, the dynamic steering shaft assembly 9 of the plugging head moves around the rotating shaft assembly 7 of the plugging head in an arc trajectory. The dynamic steering shaft assembly 9 of the plugging head rotates from the initial position to the end position, which is equivalent to the spherical plugging head 1 rotating 90°.

[0100] In the feeding device 2, the pipe laying device 25 and the oil and electricity pipe laying device assembly 10 are the same component assembly. The pipe laying device 25 is installed on the main support frame 21. Specifically, the oil and electricity pipe laying device assembly 10 is installed between the two main support frames 21 through the pipe laying device 25, and the oil and electricity pipeline between the oil and electricity pipe laying device assembly 10 and the spherical sealing head 1 swings with the rotation of the spherical sealing head 1.

[0101] The attitude cylinder fixed shaft assembly 11 is installed between the two main support frames 21. The attitude cylinder fixed shaft assembly 11 and the attitude hydraulic cylinder 3 form a shaft hole fit relationship. When the attitude hydraulic cylinder 3 does work, as the attitude piston rod 37 of the attitude hydraulic cylinder 3 extends or retracts, the rigid connection combination attitude hydraulic cylinder body 31, fixed lug 33 and attitude piston rod 37 will rotate around the attitude cylinder fixed shaft assembly 11. The combination of attitude hydraulic cylinder body 31, fixed lug 33 and attitude piston rod 37 in the attitude hydraulic cylinder 3 forms a swing posture.

[0102] The upper connector of the hydraulic / electrical pipeline 12 is connected to the flange cover 53, and the lower connector of the hydraulic / electrical pipeline 12 is fixed on the oil and electricity pipeline assembly 10. The lower connector of the hydraulic / electrical pipeline 12 is connected to the corresponding connectors of the spherical plug head 1 and the attitude hydraulic cylinder 3 respectively. The hydraulic / electrical pipeline 12 is in contact with the medium inside the pipeline.

[0103] 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 hydraulic cylinder 5, the feed hydraulic cylinder spindle 14, and the manual / automatic integrated control valve block 15.

[0104] The feed hydraulic cylinder spindle 14 is one of the components of the feed hydraulic cylinder in the entire sealing process equipment. The feed hydraulic cylinder spindle 14 is installed on the second mounting interface.

[0105] The manual / automatic integrated control valve block 15 is installed on the sealing connector 13 or at other work positions outside the pipeline. The manual / automatic integrated control valve block 15 is a manual or automatic control command component and a status information receiving component. Hydraulic directional valves, relief valves, check valves, pressure sensors and other components are installed on its valve body. The main oil supply port and return port of the manual / automatic integrated control valve block 15 are connected to the corresponding interfaces of the external hydraulic station 19. The electrical control cable of the manual / automatic integrated control valve block 15 is connected to the external human-machine interface control console 18. The manual / automatic integrated control valve block 15 is used to control the spherical sealing head 1 and the posture hydraulic cylinder 3.

[0106] The upper connector of the external hydraulic / electrical pipeline 16 is connected to the flange cover 53. The external hydraulic / electrical pipeline 16 is in contact with the external atmosphere. The lower connector of the external hydraulic / electrical pipeline 16 is connected to the manual / automatic integrated control valve block 15.

[0107] One end of the external control cable 17 is connected to the corresponding electronic control component on the manual / automatic integrated control valve block 15, and the other end is connected to the external human-machine interface control console 18.

[0108] The external human-machine interaction control console 18 is a programmable human-machine interaction computer system. The external human-machine interaction control console 18 is a control station for issuing instructions and for the feedback and processing of status information of the internal execution mechanism.

[0109] The external hydraulic station 19 serves as a hydraulic power source, providing active sealing hydraulic power for a double-seal single-test-tube internal high-pressure plugging hydraulic system.

[0110] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A double-seal single-chamber plugging device, characterized in that, include: The sealing connector has an inlet cavity; A feeding device is connected to the sealing connector, and the feeding device has a feeding hydraulic cylinder inserted into the feeding chamber; The hydraulic cylinder is inserted into the feed chamber; A posture hydraulic cylinder is disposed in the feed chamber; A spherical sealing head includes a setting hydraulic cylinder, a sealing assembly annularly disposed around the setting hydraulic cylinder, and a shower head that confines the sealing assembly within the setting hydraulic cylinder. The setting hydraulic cylinder includes a setting hydraulic cylinder piston rod connected to the posture hydraulic cylinder and a setting hydraulic cylinder barrel sleeved on the setting hydraulic cylinder piston rod. The sealing assembly includes an upstream retaining ring arranged axially along the setting hydraulic cylinder piston rod and an active retaining ring, an upstream sealing ring, a single test chamber ring, a downstream sealing ring, a passive retaining ring, and a downstream retaining ring annularly disposed around the setting hydraulic cylinder barrel. The setting hydraulic cylinder barrel and the setting hydraulic cylinder piston rod together form a first pressurizing chamber and a second pressurizing chamber that are arranged axially along the setting hydraulic cylinder piston rod and isolated from each other. The first pressurizing chamber and the second pressurizing chamber are both connected to the hydraulic cylinder through the internal pipeline of the setting hydraulic cylinder piston rod. During the sealing process, the setting hydraulic cylinder compresses the upstream sealing ring and the downstream sealing ring under the action of the medium in the pipeline to be sealed to passively seal the inner wall of the pipeline. The hydraulic cylinder also drives the setting hydraulic cylinder to compress the upstream sealing ring and the downstream sealing ring to actively seal the inner wall of the pipeline. The single test chamber ring is provided with a ring cavity hole, which is connected to a pressure sensor outside the pipeline through the hole system of the spherical plug head. The sealing test of the downstream sealing ring and the upstream sealing ring is carried out by unloading the medium pressure in the single test chamber ring and pressurizing after filling the single test chamber ring with medium. The oil-electric cylinder includes a main cylinder body inserted into the feed chamber, a scale assembly disposed on the main cylinder body, a flange cover sealed to the main cylinder body, a top chamber assembly of the oil cylinder connected to the flange cover, an oil and gas pipe assembly and a control cable assembly disposed on the top chamber assembly, and a sealing steel ring sealingly connected between the flange cover and the top chamber assembly.

2. The double-seal single-chamber plugging device according to claim 1, characterized in that, Also includes: A retaining ring is provided around the piston rod of the seated hydraulic cylinder and sandwiched between the downstream retaining ring and the shower head.

3. The double-seal single-chamber plugging device according to claim 1, characterized in that, The upstream diameter retaining ring is fixedly connected to the piston rod of the setting hydraulic cylinder; the sealing device also includes a displacement sensor disposed on the upstream diameter retaining ring, the displacement sensor being positioned corresponding to the magnetic ring installed on the setting hydraulic cylinder barrel, and the displacement sensor measuring the displacement of the setting hydraulic cylinder barrel by detecting the position change of the magnetic ring.

4. The double-seal single-chamber plugging device according to claim 1, characterized in that, The piston rod of the setting hydraulic cylinder is equipped with an air blowing circuit, and the shower head is equipped with air holes; The plug also includes an air-blowing circuit connector connected to a gas generator. The air-blowing circuit connector 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 hole of the shower head.

5. The double-seal single-chamber plugging device according to claim 1, characterized in that, The feeding device includes two main support frames that are arranged opposite to each other and are respectively connected to the sealing connector and inserted into the feeding cavity; the feeding device also includes a sealing head rotating shaft arranged in the feeding cavity and rotatably connected to the piston rod of the setting hydraulic cylinder, an attitude cylinder fixing shaft arranged in the feeding cavity and rotatably connected to the attitude hydraulic cylinder, a knife edge support ring arranged in the main support frame and used to support the pipe opening knife edge, a support ring arranged in the main support frame and clearance-fitted with the sealing connector, and a first mounting interface arranged in the main support frame and inserted into the oil-electric pipe cylinder.

6. The double-seal single-chamber plugging device according to claim 5, characterized in that, Also includes: A sealing head limiting rod assembly is disposed in the feeding cavity and is used to limit the position of the spherical sealing head.

7. The double-seal single-chamber plugging device according to claim 1, characterized in that, The attitude hydraulic cylinder includes an attitude hydraulic cylinder body, an electromagnetic chamber shell disposed on the attitude hydraulic cylinder body, a fixed lug disposed on the electromagnetic chamber shell, a steering displacement sensor disposed inside the electromagnetic chamber shell, an attitude piston rod disposed inside the attitude hydraulic cylinder body, a magnetic rod disposed inside the attitude hydraulic cylinder body and connected to the attitude piston rod, and a movable lug disposed on the attitude piston rod and used for connecting to the spherical sealing head.

8. The double-seal single-chamber plugging device according to claim 1, characterized in that, Also includes: A gate valve is disposed on the outer periphery of the feeding device and is sealed and connected to the sealing connector.

9. A double-seal single-chamber plugging device according to claim 5, characterized in that, Also includes: The second mounting interface is disposed on the main support frame; The feed hydraulic cylinder spindle is inserted into the feed cavity and connected to the second mounting interface. The feed hydraulic cylinder spindle is used to drive the feed device to move.

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