Plugging and isolating structure for preventing leakage of gas pipeline

Abstract

The invention relates to the technical field of gas pipelines, in particular to a plugging and isolating structure for preventing leakage of a gas pipeline. The invention discloses a plugging and isolating structure for preventing gas pipeline leakage. The plugging and isolating structure comprises pipeline bodies, and the multiple pipeline bodies are spliced front and back to be used for conveying gas; every two adjacent pipeline bodies are connected through the corresponding electromagnetic valve; the gas concentration sensor is arranged on the pipeline body; the emergency gas channel is used for supplying gas to enable the airbag plugging mechanism to expand; the emergency control piece is used for controlling the emergency gas channel to be communicated and closed and controlling the air bag plugging mechanism to be locked and unlocked; the air bag plugging mechanism comprises a plugging piece and a driving piece which are connected. According to the invention, further diffusion of residual gas in the damaged pipeline body can be avoided without arriving at the site by emergency rescue personnel, so that time is bought for follow-up repair work, and the safety risk caused by gas leakage is reduced to the maximum extent.

Description

Technical Field

[0001] This invention relates to the field of gas pipeline technology, specifically a sealing and isolation structure for preventing gas pipeline leaks. Background Technology

[0002] Gas leaks within gas pipelines can easily lead to serious accidents such as fires and explosions if they are not promptly sealed and isolated. Existing gas pipeline leak handling methods are insufficient in terms of rapid response and effective sealing, making it difficult to control the leak's extent within a short period.

[0003] Because the entire gas transmission pipeline is quite long, several pipes of a certain length are spliced ​​together. Electromagnetic valves are installed at the splice points to control the opening and closing of the pipeline, thus forming the transmission line. After a gas leak occurs, firefighters need to arrive on-site to spray gas to reduce the concentration of gas spreading into the air, and gas company personnel need to arrive to seal the upstream of the damaged gas pipeline. Before personnel arrive on-site, it is impossible to handle or intervene in the gas leak, allowing the gas to continue spreading and endangering the public. Summary of the Invention

[0004] The purpose of this invention is to provide a sealing and isolation structure for preventing gas pipeline leaks, thereby solving the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sealing and isolation structure for preventing gas pipeline leakage, comprising a pipeline body, wherein several pipeline bodies are spliced ​​together front and back for transporting gas; Electromagnetic valves are used to connect two adjacent pipe bodies. A gas concentration sensor is installed on the pipeline body to detect the gas concentration inside the pipeline body and transmit the detection data to the control center. An airbag sealing mechanism and an emergency gas channel, wherein the emergency gas channel is used to supply gas to inflate the airbag sealing mechanism; Emergency control components are used to control the connection and closure of emergency gas passages, and to control the locking and unlocking of the airbag sealing mechanism; The airbag sealing mechanism includes a sealing component and a traveling component connected together. The traveling component is used to control the movement and positioning of the sealing component within the delivery cavity of the pipeline body. The airbag sealing mechanism is used to seal the damaged part of the pipeline body after it expands.

[0006] Furthermore, one end of the pipe body is an air inlet a, and the other end is an air outlet b; the emergency gas channel includes a through hole one, a through hole two, a through hole three, and a venting cavity that are connected to each other. The through hole one is located on the air outlet b, the through hole two is located on the solenoid valve, the through hole three and the venting cavity are located on the air inlet a, and the venting cavity is between the through hole three and the air outlet b; The outlet b of the upstream pipeline body is connected to the inlet a of the downstream pipeline body through a solenoid valve.

[0007] Furthermore, the emergency control component includes a valve plate, a valve stem, and a control device. The valve plate is connected to the through hole three via the valve stem. The top end of the valve stem extends through to the outside of the pipe body and is connected to the control device, which is used by the control device to control the rotation of the valve stem and the valve plate.

[0008] Furthermore, the sealing component includes a support frame, a ring plate one, an air storage bag, and a ring plate two arranged side by side. The ring plate one is provided with several through holes five. The support frame includes an integral tail plate, a solid section c, and a venting section d. The venting section d is provided with a through hole four, which communicates with the through holes five. The inner side of the ring plate one corresponding to the through holes five is provided with an inner cylinder for separating the support frame and the conveying cavity of the pipeline body. The support frame is fitted with a positioning ring that moves along its length to open and block the through hole four. It also includes a spring one. The positioning ring is connected to the ring plate one through the spring one. When the spring one contracts, it drives the positioning ring to close with the ring plate one, so that the positioning ring blocks the through hole four.

[0009] Furthermore, it also includes a positioning rod, the bottom end of which penetrates the through hole three. The positioning rod is located at the bottom end of the valve stem and extends in its thickness direction to below the valve stem, so that there is a height difference between the positioning rod and the valve stem. The positioning ring is provided with a rotating groove and a central block, the rotating groove and the central block are concentric, and the rotating groove is provided with station 1 h, station 2 m and station 3 n, so that the positioning rod locks and unlocks the positioning ring through the rotating groove and the central block. The rotating groove is provided with a disengagement port at the corresponding station 3 n, and the valve plate is perpendicular to the opposite plane of the positioning rod.

[0010] Furthermore, the traveling component includes a bracket, a power component, a rotating wheel, and a telescopic component. The bracket and the telescopic component are both located on the second ring plate. The bracket is equipped with a rotating wheel and a power component. The output shaft of the power component is connected to the rotating wheel. The driving end of the telescopic component is equipped with a brake plate to control the frictional resistance between the brake plate and the conveying cavity of the pipeline body.

[0011] Furthermore, the gas storage bladder is an annular cylindrical shape, and the interior of the cylinder wall is hollow along its length, so that the gas storage bladder expands after the cylinder wall is filled with gas.

[0012] Furthermore, the air reservoir has several creases along its length to ensure that it folds neatly, and an exhaust pipe is provided on the air reservoir to expel the gas inside.

[0013] Furthermore, several emergency gas channels, several support frames, and several springs are provided.

[0014] Furthermore, the rotating wheel has a large radius in the middle and a small radius at both ends in the axial direction, so that the rotating wheel fits into the conveying cavity. There is friction between the rotating wheel and the conveying cavity, so that the rotating wheel rotates and moves forward in the conveying cavity.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention can remotely shut off the electromagnetic valves upstream and downstream of the damaged pipeline before emergency rescue personnel arrive at the scene, isolating the leak area from other normal areas; it can also remotely inflate the gas storage bag and move it to the damaged area to seal it, preventing the further spread of residual gas in the damaged pipeline without the need for emergency rescue personnel to arrive at the scene, thus buying time for subsequent repair work and minimizing the safety risks caused by gas leaks. Attached Figure Description

[0016] Figure 1 This is a truncated view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a left-side view of the air reservoir in this invention; Figure 5 This is a right-side view of the air reservoir in this invention; Figure 6 This is a perspective view of the first ring plate in this invention; Figure 7 For this Figure 6 Enlarged view at point B in the middle; Figure 8 This is a perspective view of the tail plate in this invention.

[0017] In the diagram: 1. Pipeline body; 2. Solenoid valve; 3. Emergency gas passage; 4. Emergency control components; 5. Sealing components; 6. Crane components; 30. Through hole one; 31. Through hole two; 32. Through hole one; 33. Vent chamber; 40. Valve plate; 41. Valve stem; 42. Positioning rod; 43. Control device; 50. Support frame; 51. Ring plate one; 52. Air reservoir; 53. Ring plate two; 54. Tail plate; 55. Through hole four; 56. Through hole five; 57. Spring one; 58. Positioning ring; 59. Rotating groove; 60. Center block; 61. Disengagement port; 62. Exhaust pipe; 63. Inner cylinder; 70. Bracket; 71. Power component; 72. Rotary wheel; 73. Telescopic component; 74. Brake plate. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] See Figures 1-8 .

[0020] The present invention provides a sealing and isolation structure for preventing gas pipeline leakage, including a pipeline body 1, and several pipeline bodies 1 are spliced ​​together for transporting gas; Electromagnetic valve 2 connects two adjacent pipe bodies 1; A gas concentration sensor is installed on the pipeline body 1 to detect the gas concentration inside the pipeline body 1 and transmit the detection data to the control center; An airbag sealing mechanism and an emergency gas channel 3, wherein the emergency gas channel 3 is used to supply gas to inflate the airbag sealing mechanism; Emergency control component 4 is used to control the connection and closure of emergency gas passage 3, and to control the locking and unlocking of airbag sealing mechanism; The airbag sealing mechanism includes a sealing component 5 and a traveling component 6 connected to each other. The traveling component 6 is used to control the movement and positioning of the sealing component 5 within the conveying cavity of the pipeline body 1. The airbag sealing mechanism is used to seal the damaged part of the pipeline body 1 after it expands.

[0021] Furthermore, one end of the pipe body 1 is an air inlet a, and the other end is an air outlet b; the emergency gas channel 3 includes a through hole 30, a through hole 31, a through hole 32 and a venting chamber 33 that are connected to each other. The through hole 30 is located on the air outlet b, the through hole 31 is located on the solenoid valve 2, the through hole 32 and the venting chamber 33 are located on the air inlet a, and the venting chamber 33 is between the through hole 32 and the air outlet b; The outlet b of the upstream pipeline body 1 is connected to the inlet a of the downstream pipeline body 1 through a solenoid valve 2.

[0022] In one embodiment, the emergency control component 4 includes a valve plate 40, a valve stem 41, and a control device 43. The valve plate 40 is connected to the through hole 32 via the valve stem 41. The top end of the valve stem 41 extends through to the outside of the pipe body 1 and is connected to the control device 43, which controls the rotation of the valve stem 41 and the valve plate 40. The control device 43 can be a transmission mechanism consisting of a motor and gears, or it can be a single motor. It can remotely control the rotation of the motor; this part is prior art and therefore not described in detail.

[0023] In one embodiment, the sealing component 5 includes a support frame 50, a first ring plate 51, an air storage bag 52, and a second ring plate 53 arranged side by side. The first ring plate 51 is provided with a plurality of through holes 56. The support frame 50 includes an integral tail plate 54, a solid section c, and a venting section d. The venting section d is provided with a fourth through hole 55, which communicates with the fifth through hole 56. The inner cylinder 63 is provided on the inner side of the first ring plate 51 corresponding to the fifth through hole 56, for separating the support frame 50 and the conveying cavity of the pipe body 1. The support frame 50 is fitted with a positioning ring 58 that moves along its length direction for opening and sealing the through hole 4 55. It also includes a spring 57. The positioning ring 58 is connected to the ring plate 51 through the spring 57. When the spring 57 contracts, it drives the positioning ring 58 to close with the ring plate 51, so that the positioning ring 58 seals the through hole 4 55.

[0024] Furthermore, it also includes a positioning rod 42, the bottom end of the valve stem 41 passes through the through hole 32, the positioning rod 42 is located at the bottom end of the valve stem 41, the positioning rod 42 extends in its thickness direction to below the valve stem 41, so that there is a height difference between the positioning rod 42 and the valve stem 41; The positioning ring 58 is provided with a rotating groove 59 and a center block 60, which are concentric. The rotating groove 59 is provided with three workstations: h, m, and n, allowing the positioning rod 42 to lock and unlock the positioning ring 58 via the rotating groove 59 and the center block 60. A disengagement port 61 is provided on the rotating groove 59 at the corresponding workstation n. The valve plate 40 is perpendicular to the positioning rod 42. Wherein: 1. Under normal conditions, the positioning rod 42 locks the airbag sealing mechanism at the workstation for one hour, and the valve plate 40 closes the emergency gas passage 3; 2. When the gas storage bag 52 is inflated in case of an emergency, the positioning rod 42 locks the gas bag sealing mechanism at position 2m, and the valve plate 40 opens the emergency gas passage 3; 3. After the air bladder 52 is fully inflated, the positioning rod 42 unlocks the air bladder sealing mechanism at station three, and the valve plate 40 closes the emergency gas passage 3.

[0025] In one embodiment, the traveling component 6 includes a bracket 70, a power component 71, a rotating wheel 72, and a telescopic component 73. Both the bracket 70 and the telescopic component 73 are located on the annular plate 53. The bracket 70 is equipped with the rotating wheel 72 and the power component 71. The output shaft of the power component 71 is connected to the rotating wheel 72. The driving end of the telescopic component 73 is equipped with a brake plate 74 to control the frictional resistance between the brake plate 74 and the conveying cavity of the pipe body 1. The power component 71 can be an electric motor, a pneumatic motor, a hydraulic motor, etc. The telescopic component 73 can be an electric push rod, a pneumatic telescopic component, a hydraulic telescopic component, etc.

[0026] Specifically, the gas storage bladder 52 is an annular cylindrical shape, and the inside of the cylinder wall is hollow along its length, so that the gas storage bladder 52 expands after the cylinder wall is filled with gas.

[0027] Specifically, the air reservoir 52 has several creases along its length to make it fold neatly, and the air reservoir 52 is provided with an exhaust pipe 62 to discharge the gas inside the air reservoir 52.

[0028] Specifically, the emergency gas passage 3 is provided in several units, the support frame 50 is provided in several units, and the spring 57 is provided in several units.

[0029] Specifically, the rotating wheel 72 has a large radius in the middle and a small radius at both ends in the axial direction, so that the rotating wheel 72 fits into the conveying cavity. There is friction between the rotating wheel 72 and the conveying cavity, which causes the rotating wheel 72 to rotate and move forward in the conveying cavity.

[0030] In operation, several pipe bodies 1 of a certain length are spliced ​​together along the entire gas transmission pipeline. A solenoid valve 2 is installed at the splice point. The outlet b of the upstream pipe body 1 is connected to the inlet a of the downstream pipe body 1 via the solenoid valve 2. One upstream solenoid valve 2 and one downstream pipe body 1 constitute a unit. The valve plate 40 on the valve stem 41 blocks the through hole 31, closing the emergency gas passage 3. The sealing element 5 in the airbag sealing mechanism folds and retracts at the inlet a of the pipe body 1. The telescopic element 73 extends, causing the brake plate 74 to abut against the transmission chamber of the pipe body 1. Each pipe body 1 is equipped with a gas concentration sensor. The concentration sensor is located at the outlet b of the pipeline body 1, which detects the gas concentration in the pipeline body 1 in real time and transmits the detection data to the control center. The control center analyzes the detected data. When there is a leak in the pipeline body 1, the control center reverses the abnormal data to find the damaged pipeline body 1, and marks the location of the damage point on the pipeline body 1 through simulation software, that is, the distance L from the damage point to the inlet a. The specific analysis process is existing technology and will not be described in detail. The pipeline body 1 upstream of the damaged pipeline body 1 is called pipeline body one, and the pipeline body 1 downstream of the damaged pipeline body 1 is called pipeline body two.

[0031] Upon receiving an emergency command from the control center, the solenoid valves 2 located at both ends of the damaged pipeline body 1 close. Before emergency rescue personnel arrive at the scene, the solenoid valves 2 upstream and downstream of the damaged pipeline body 1 can be remotely closed to isolate the leaking area from other normal areas. A large amount of gas is still leaking out through the rupture in the damaged pipeline body 1, and emergency rescue personnel still need to arrive at the scene to further seal it.

[0032] In order to stop the gas leakage from the damaged pipeline body 1, the traveling component 6 stops braking and starts moving. The telescopic component 73 retracts, causing the brake plate 74 to move away from the conveying chamber. The power component 71 drives the rotating wheel 72 to rotate. Due to the frictional resistance between the rotating wheel 72 and the conveying chamber of the pipeline body 1, the rotating wheel 72 moves forward along the conveying chamber. The rotating wheel 72 drives the support 70, the second ring plate 53 and the gas storage bag 52 to move forward synchronously until the gas storage bag 52 is straightened.

[0033] The control mechanism drives the valve stem 41 and valve plate 40 to rotate 90 degrees. The valve stem 41 drives the positioning rod 42 to rotate around the center block 60 from station 1h to station 2m. The center block 60 stands on the left side of the positioning rod 42, and the rotating groove 59 restricts the right side of the positioning rod 42. At this time, the spring 57 cannot retract. The emergency passage is opened. The gas in the pipeline body 1 enters the emergency gas passage 3 through the through hole 30 at its outlet b, and then reaches the ventilation chamber 33 of the damaged pipeline body 1. The gas then enters the gas storage bladder 52 through the through hole 55 on the support frame 50 and the through hole 56 on the ring plate 51. As the gas in the gas storage bladder 52 increases, the gas storage bladder 52 expands more and more. The traveling component 6 is pushed outward, and the side wall of the gas storage bladder 52 becomes more and more attached to the inner wall of the gas transmission pipeline. After the preset amount of gas is delivered, the side wall of the gas storage bag 52 fits against the inner wall of the pipeline body 1; the control device 43 drives the valve stem 41, valve plate 40 and positioning rod 42 to continue rotating 90 degrees, the valve plate 40 blocks the through hole 31, the emergency gas passage 3 is closed, and the positioning rod 42 rotates from station 2m to station 3n; at station 3n, neither the rotating groove 59 nor the center block 60 can restrict the positioning rod 42, and under the action of the spring 57's own elasticity, the spring 57 contracts and drives the positioning ring 58 from the solid section c of the support frame 50 to move In the ventilation section d, the final positioning ring 58 engages with ring plate 1 51, sealing the through hole 4 55. At this point, the gas reservoir 52 cannot inhale or exhale. The traveling mechanism 6 continues forward, driving ring plate 1 51, gas reservoir 52, and ring plate 2 53 forward until ring plate 2 53 passes the damaged area. The damaged area is located between ring plate 1 51 and ring plate 2 53, with the gas reservoir 52 sealing the damaged area. The traveling mechanism 6 then applies the brakes and stops moving. Combined with the pressure from the remaining gas within the damaged pipeline body 1, the gas reservoir 52 is fixed at the damaged area. Before emergency rescue personnel arrive on site, the upstream and downstream solenoid valves 2 of the damaged pipeline body 1 can be remotely closed to isolate the leak area from other normal areas. The gas reservoir 52 can be remotely inflated and moved to the damaged area to seal it, preventing further diffusion of the remaining gas within the damaged pipeline body 1, thus buying time for subsequent repairs and minimizing the safety risks associated with gas leakage.

[0034] Cutting and replacing a small section of the damaged pipeline body 1 is a current technology. According to the current technology, after the emergency rescue personnel arrive at the scene, they extract the gas from the damaged pipeline body 1, then cut the damaged section of the pipeline body 1, open the exhaust pipe 62 on the second ring plate 53, extract the gas from the gas storage bag 52 through the exhaust pipe 62, and then take it to replace the pipeline. After the gas bag sealing mechanism is folded and retracted, it is placed in the replacement pipeline with the rotating groove 59 facing upward. The installed replacement pipeline is connected to the cut pipeline body 1. The traveling component 6 pushes the gas bag sealing mechanism forward to the air inlet end a of the pipeline body 1 to reset. At this time, the center block 60 reaches the bottom of the valve stem 41 to reset, the rotating groove 59 reaches the bottom of the positioning rod 42 to reset, the station three n is aligned with the positioning rod 42, the positioning rod 42 stands on the station three n, the valve stem 41 drives the positioning rod 42 to rotate 180 degrees in the opposite direction to reset, and the positioning rod 42 is again limited by the center block 60 and the rotating groove 59.

[0035] The airbag sealing mechanism can be reused if it meets quality standards.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0037] It should be noted that if the embodiments of the invention involve directional indicators such as up and down, the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the figure. If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Additionally, if the embodiments of the invention involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, "multiple" refers to two or more.

[0039] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the invention.

Claims

1. A sealing and isolation structure for preventing gas pipeline leakage, characterized in that, include: Pipeline body (1), several pipeline bodies (1) are spliced ​​together to transport gas; Electromagnetic valve (2), the two adjacent pipe bodies (1) are connected by electromagnetic valve (2); A gas concentration sensor is installed on the pipeline body (1) to detect the gas concentration in the pipeline body (1) and transmit the detection data to the control center; An airbag sealing mechanism and an emergency gas channel (3), wherein the emergency gas channel (3) is used to supply gas to inflate the airbag sealing mechanism; Emergency control component (4) is used to control the connection and closure of the emergency gas passage (3), and to control the locking and unlocking of the airbag sealing mechanism; The airbag sealing mechanism includes a sealing component (5) and a traveling component (6) connected to each other. The traveling component (6) is used to control the movement and positioning of the sealing component (5) within the delivery cavity of the pipeline body (1). The airbag sealing mechanism is used to seal the damaged part of the pipeline body (1) after it expands.

2. The sealing and isolation structure for preventing gas pipeline leakage according to claim 1, characterized in that, One end of the pipe body (1) is the air inlet a, and the other end is the air outlet b; the emergency gas channel (3) includes a through hole one (30), a through hole two (31), a through hole three (32) and a venting chamber (33) connected together. The through hole one (30) is located on the air outlet b, the through hole two (31) is located on the solenoid valve (2), the through hole three (32) and the venting chamber (33) are located on the air inlet a, and the venting chamber (33) is between the through hole three (32) and the air outlet b; The outlet b of the upstream pipeline body (1) is connected to the inlet a of the downstream pipeline body (1) through the electromagnetic valve (2).

3. The sealing and isolation structure for preventing gas pipeline leakage according to claim 2, characterized in that, The emergency control component (4) includes a valve plate (40), a valve stem (41), and a control device (43). The valve plate (40) is connected to the through hole three (32) via the valve stem (41). The top end of the valve stem (41) extends through to the outside of the pipe body (1) and is connected to the control device (43) for the control device (43) to control the rotation of the valve stem (41) and the valve plate (40).

4. The sealing and isolation structure for preventing gas pipeline leakage according to claim 3, characterized in that, The sealing component (5) includes a support frame (50), a ring plate one (51), an air storage bag (52) and a ring plate two (53) arranged side by side. The ring plate one (51) is provided with several through holes five (56). The support frame (50) includes an integral tail plate (54), a solid section c and a ventilation section d. The ventilation section d is provided with a through hole four (55). The through hole four (55) communicates with the through hole five (56). The inner cylinder (63) is provided on the inner side of the ring plate one (51) corresponding to the through hole five (56) to separate the support frame (50) and the conveying cavity of the pipeline body (1). The support frame (50) is fitted with a positioning ring (58) that moves along its length direction for opening and sealing the through hole four (55). It also includes a spring one (57). The positioning ring (58) is connected to the ring plate one (51) through the spring one (57) and is used to drive the positioning ring (58) to close with the ring plate one (51) when the spring one (57) contracts, so that the positioning ring (58) seals the through hole four (55).

5. The sealing and isolation structure for preventing gas pipeline leakage according to claim 4, characterized in that, It also includes a positioning rod (42), the bottom end of the valve stem (41) passes through the through hole three (32), the positioning rod (42) is located at the bottom end of the valve stem (41), the positioning rod (42) extends in its thickness direction to below the valve stem (41), so that there is a height difference between the positioning rod (42) and the valve stem (41); The positioning ring (58) is provided with a rotating groove (59) and a center block (60). The rotating groove (59) and the center block (60) are concentric. The rotating groove (59) is provided with station 1 h, station 2 m and station 3 n, so that the positioning rod (42) locks and unlocks the positioning ring (58) through the rotating groove (59) and the center block (60). The rotating groove (59) is provided with a disengagement port (61) at the corresponding station 3 n. The valve plate (40) is perpendicular to the positioning rod (42) on opposite planes.

6. The sealing and isolation structure for preventing gas pipeline leakage according to claim 5, characterized in that, The traveling component (6) includes a bracket (70), a power component (71), a rotating wheel (72), and a telescopic component (73). The bracket (70) and the telescopic component (73) are both located on the second ring plate (53). The bracket (70) is provided with the rotating wheel (72) and the power component (71). The output shaft of the power component (71) is connected to the rotating wheel (72). The driving end of the telescopic component (73) is provided with a brake plate (74) to control the frictional resistance between the brake plate (74) and the conveying cavity of the pipeline body (1).

7. The sealing and isolation structure for preventing gas pipeline leakage according to any one of claims 1-6, characterized in that, The gas storage bladder (52) is an annular cylindrical shape, and the inside of the cylinder wall is hollow along its length, so that the gas storage bladder (52) expands after the cylinder wall is filled with gas.

8. The sealing and isolation structure for preventing gas pipeline leakage according to claim 7, characterized in that, The air reservoir (52) has several creases along its length so that the air reservoir (52) can be folded and closed neatly. The air reservoir (52) is provided with an exhaust pipe (62) to discharge the gas inside the air reservoir (52).

9. The sealing and isolation structure for preventing gas pipeline leakage according to claim 8, characterized in that, The emergency gas passage (3) is provided in several units, the support frame (50) is provided in several units, and the spring (57) is provided in several units.

10. The sealing and isolation structure for preventing gas pipeline leakage according to claim 9, characterized in that, The rotating wheel (72) has a large radius in the middle and a small radius at both ends in the direction of its axis, so that the rotating wheel (72) fits into the conveying cavity. There is friction between the rotating wheel (72) and the conveying cavity, so that the rotating wheel (72) rotates and moves forward in the conveying cavity.

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