CN116045096A

CN116045096A - Sealing device and sealing method for natural gas pipeline

Info

Publication number: CN116045096A
Application number: CN202310157483.5A
Authority: CN
Inventors: 李旭春; 沈世友; 刘培东; 李鹏宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-02-23
Filing date: 2023-02-23
Publication date: 2023-05-02

Abstract

The utility model relates to the technical field of pipeline sealing, in particular to a sealing device and a sealing method for a natural gas pipeline. The sealing device comprises a butt joint body and a sealing body arranged in the butt joint body. According to the utility model, the inner sealing body and the outer sealing body are arranged, the outer air bag expands towards the direction of the outer wall of the pipeline to fill the gap between the outer steel ring and the outer wall of the pipeline, so that the sealing fixation of the outer wall of the pipeline is realized, the inner air bag expands towards the direction of the inner wall of the pipeline under the limiting action of the inner steel ring at the inner side to fill the gap between the inner steel ring and the inner wall of the pipeline, and the sealing fixation is carried out on the inner wall of the pipeline to provide an outward supporting force so as to offset part of the inward extruding force, and the pipeline can be prevented from being shrunken.

Description

Sealing device and sealing method for natural gas pipeline

Technical Field

The utility model relates to the technical field of pipeline sealing, in particular to a sealing device and a sealing method for a natural gas pipeline.

Background

The natural gas pipeline refers to a pipeline for conveying natural gas from a mining place or a treatment plant to an urban gas distribution center or an industrial enterprise user, and is formed by connecting a plurality of pipelines, so that leakage of the natural gas is avoided, and a sealing device is generally arranged at the connecting position of the pipelines.

The utility model provides a relate to a sealing device for natural gas pipeline leakage in the CN211175895U, including the pipeline body, two sealed pads have been cup jointed to the outer wall of pipeline body, and all open the outer wall of two sealed pads has the through-hole, and the connecting rod has all been pegged graft to the inner wall of two through-holes, the both ends of connecting rod all are equipped with the curb plate, and the opposite side outer wall of two curb plates all is equipped with a fixed plate, two the top outer wall of a fixed plate all is equipped with the connecting plate, and all open the outer wall of two connecting plates has a screw hole, and the inner wall of two screw holes is equipped with a connecting bolt, and the outer wall of a connecting bolt is equipped with a coupling nut. According to the utility model, the connecting rods, the side plates, the connecting plates and the first fixing plate are arranged, when the fixing sleeve is installed, the two connecting plates are connected through the first connecting bolt and the first connecting nut, so that the sealing gasket is limited, sliding of the sealing gasket is avoided, the practicability of the device is improved, in the device, after the sealing gasket is sleeved on the outer wall of a pipeline, the fixing sleeve is sleeved on the sealing gasket again, and the sealing sleeve is fixed on the outer wall of the pipeline through pressure, so that the sealing effect is realized, but the requirement on the structural strength of the pipeline is extremely high, and otherwise, the condition that the pipeline is damaged and deformed inwards can occur.

In order to ensure the sealing of a pipeline and avoid the pipeline from being pressed and deformed, a sealing device and a sealing method for a natural gas pipeline are provided.

Disclosure of Invention

The utility model aims to provide a sealing device and a sealing method for a natural gas pipeline, which are used for solving the problems in the background technology.

In order to achieve the above object, one of the objects of the present utility model is to provide a sealing device for a natural gas pipeline, comprising a butt joint body and a sealing body disposed in the butt joint body, wherein the butt joint body comprises an adjusting bracket, two ends of the adjusting bracket are symmetrically provided with end sleeves for connecting the pipeline, an adjusting groove penetrating through the upper surface and the lower surface of the adjusting bracket is formed in the middle of the adjusting bracket, an adjusting body is disposed in the adjusting groove, a hoop is symmetrically disposed at the bottom of the adjusting bracket, the sealing body comprises a connecting pipe disposed in the hoop, two ends of the connecting pipe are symmetrically provided with end pipes, an inner groove is formed in the inner wall of the end pipes, a sealing structure is disposed in the inner groove, the sealing structure comprises an inner sealing body and an outer sealing body disposed outside the inner sealing body, the inner sealing body is in contact with the inner wall of the pipeline, the outer sealing body is in contact with the outer wall of the pipeline, an air ventilation structure is disposed in the adjusting body, the air ventilation structure is connected with the inner sealing body through an air pipe, a plurality of bevel edges are disposed in the inner side edges of the inner groove, the air port is formed in the air port, the inner sealing body is connected with the inner sealing body, the air bag is pushed by the inner sealing body, and the air sealing structure is pushed by the air sealing structure, and the air sealing structure is inflated by the air sealing structure.

As a further improvement of the technical scheme, the outer sealing body comprises an outer steel ring arranged on the outer side of the inner groove, an outer air bag is arranged in a groove on the inner side of the outer steel ring, and the outer air bag is connected with the ventilation structure through an air pipe.

As a further improvement of the technical scheme, the inner sealing body comprises an inner steel ring which is arranged on the inner side of the inner groove, an inner air bag is arranged in a groove on the outer side of the inner steel ring, the inner air bag is connected with the ventilation structure through an air pipe, the natural air bag is positioned outside the groove on the outer side of the inner steel ring, and the natural air bag is in contact with the inner air bag.

As a further improvement of the technical scheme, the adjusting body comprises a bracket inserted into the bottom of the adjusting groove and a torsion column positioned in the adjusting groove, the bottom of the torsion column is rotationally connected with the bracket, second screw shafts are rotationally connected to the side walls of two ends of the bracket, the bottom of the bracket is in gear engagement with one end of the second screw shafts close to the bracket, the pressure transmission structure comprises a connecting plate which is inserted into the surface of the connecting pipe and matched with the surface of the connecting pipe, the second screw shafts are in threaded connection with the connecting plate, a bottom plate is inserted into the bottom of the connecting plate, and the other end of the bottom plate is positioned between the inner air bag and the natural air bag.

As a further improvement of the technical scheme, the ventilation structure comprises a ventilation body which is in plug-in fit with the bottom of the torsion column, the ventilation body is of a hollow structure, two ends of the bottom of the ventilation body are connected with the air pipes, the top of the torsion column is provided with air holes, and the top of the ventilation body is correspondingly provided with a blocking rod.

As a further improvement of the technical scheme, the outer wall of the torsion column is provided with a ring plate, the outer wall of the torsion column is sleeved with a supporting ring, a plurality of vertical rods which are spliced with the ring plate are symmetrically arranged at the top of the supporting ring, springs are arranged on the surfaces of the vertical rods, and the vertical rods are contacted with the surface of the ring plate through the arranged springs.

As a further improvement of the technical scheme, the side wall of the torsion column is provided with a perforation penetrating through the surface of the torsion column, and the bolt structure comprises a tympanic membrane positioned in the perforation and a plug shaft connected with the tympanic membrane.

As a further improvement of the technical scheme, the annular opening is symmetrically formed in the surface of the end sleeve ring, a screw is connected with the annular opening in an internal threaded mode, and a pressing plate is connected to one end, close to the pipeline, of the screw in a rotating mode.

As a further improvement of the technical scheme, two ends of the adjusting bracket are in plug-in fit with the end rings, the middle parts of two sides of the adjusting bracket are rotationally connected with first screw shafts, the first screw shafts penetrate through the end rings, and the first screw shafts are in threaded connection with the end rings.

The second object of the utility model is to provide a method for sealing by using a sealing device for natural gas pipelines, comprising the following method steps:

s1, after the end sleeve ring fixes the pipeline, the torsion column is rotated in the adjusting groove and drives the second screw shaft to rotate, and then the connecting plates connected with the connecting pipes in an inserting way drive the two ends of the connecting pipes to move until the two ends of the connecting pipes enter the pipeline;

s2, injecting air into the torsion column through the air hole, and inflating the inner air bag and the outer air bag through the air pipe, wherein the outer air bag expands towards the outer wall of the pipeline, and the inner air bag expands towards the inner wall of the pipeline;

s3, natural gas is introduced into the pipeline, and the natural air bag expands and extrudes an inner air bag;

s4, the natural air bag expands to drive the connecting plate to move, then the bracket is driven to move downwards until the blocking rod is inserted into the air hole, part of air in the inner air bag flows back into the torsion column along the air pipe, and the tympanic membrane deforms to drive the inserting shaft to move until the inserting shaft is inserted into the adjusting groove.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the sealing device and the sealing method for the natural gas pipeline, the inner sealing body and the outer sealing body are arranged, the outer air bag expands towards the direction of the outer wall of the pipeline to fill the gap between the outer steel ring and the outer wall of the pipeline, so that sealing fixation of the outer wall of the pipeline is achieved, the inner air bag expands towards the direction of the inner wall of the pipeline under the limiting action of the inner steel ring at the inner side, so that the gap between the inner steel ring and the inner wall of the pipeline is filled, sealing fixation is carried out on the inner wall of the pipeline to provide outward supporting force, and partial inward extrusion force can be counteracted, so that the pipeline can be prevented from being shrunken.

2. According to the sealing device and the sealing method for the natural gas pipeline, the plug pin structure is arranged, when the interior of the torsion column is in a closed state, part of air in the inner air bag flows back into the torsion column along the air pipe under the compression action of the natural air bag, the air pressure in the torsion column is increased, so that the tympanic membrane is deformed to drive the inserting shaft to move until the inserting shaft is inserted into the adjusting groove, and the torsion column is fixed.

3. According to the sealing device and the sealing method for the natural gas pipeline, the ventilation structure is arranged, air is injected into the torsion column through the air holes, and the air enters the air pipe through the ventilation body so as to inflate the inner air bag and the outer air bag, so that the inner air bag and the outer air bag can be inflated conveniently.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of a butt joint body according to the present utility model;

FIG. 3 is a cross-sectional structural view of an adjusting bracket of the present utility model;

FIG. 4 is a schematic view of the structure of the regulator of the present utility model;

FIG. 5 is a schematic view of the end collar structure of the present utility model;

FIG. 6 is a cross-sectional view of the seal body of the present utility model;

FIG. 7 is a cross-sectional view of a connecting tube according to the present utility model;

FIG. 8 is a schematic cross-sectional view of a closure structure of the present utility model;

FIG. 9 is a cross-sectional view of the inner seal of the present utility model;

fig. 10 is a cross-sectional view of the envelope of the present utility model.

The meaning of each reference sign in the figure is:

1. a butt joint body; 11. adjusting the bracket; 111. a hoop; 112. a first screw shaft; 12. an end collar; 121. a screw; 122. a pressing plate; 13. a regulating body; 131. a bracket; 132. twisting the column; 133. a second screw shaft; 134. a support ring; 135. introducing gas;

2. a sealing body; 21. a connecting pipe; 211. an end pipe; 212. an inner tank; 213. a beveled edge; 214. a natural air bag; 22. a closed structure; 23. an inner sealing body; 231. an inner steel ring; 232. an inner air bag; 233. a connecting plate; 234. a bottom plate; 24. an outer seal; 241. an outer steel ring; 242. an outer air bag.

Description of the embodiments

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Examples

Referring to fig. 1-10, an objective of the present embodiment is to provide a sealing device for a natural gas pipeline, which comprises a butt joint body 1 and a sealing body 2 disposed in the butt joint body 1, wherein the butt joint body 1 comprises an adjusting bracket 11, end collars 12 for connecting the pipeline are symmetrically disposed at two ends of the adjusting bracket 11, an adjusting groove penetrating through the upper and lower surfaces of the adjusting bracket 11 is provided in the middle of the adjusting bracket 11, an adjusting body 13 is disposed in the adjusting groove, a hoop 111 is symmetrically disposed at the bottom of the adjusting bracket 11, the sealing body 2 comprises a connecting pipe 21 disposed in the hoop 111, end pipes 211 are symmetrically disposed at two ends of the connecting pipe 21, an inner groove 212 is disposed on an inner wall of the end pipe 211, a sealing structure 22 is disposed in the inner groove 212, the sealing structure 22 comprises an inner sealing body 23 and an outer sealing body 24 disposed on an outer side of the inner sealing body 23, the inner sealing body 23 contacts with an inner wall of the pipeline, an air ventilation structure is disposed in the inner sealing body 13, the inner groove 212 is connected with the inner sealing body 23 through an air pipe, a plurality of air holes 213 are disposed at an inner side edge of the inner groove 212, a plurality of air holes are disposed on the air holes 214, the air holes 214 are connected with the inner groove 214, the inner groove 23 is connected with the inner sealing body 23 by a pressure-regulating body, and the air bag is further connected with the air bag 13 by a pressure regulating structure, and the air bag is further pressed by the pressure regulating structure is pressed by the air groove 23, and the air regulating structure is pressed by the air groove 23.

When the air-conditioning device is specifically used, the pipeline is fixed through the end collar 12, the torsion column 132 rotates in the adjusting groove, the torsion column 132 drives the second screw shaft 133 to rotate, and then the connecting plate 233 inserted with the connecting pipe 21 drives the two ends of the connecting pipe 21 to move, so that the two ends of the connecting pipe 21 enter the pipeline, air is injected into the torsion column 132 through the air holes, and enters the air pipe through the air holes 135 to further inflate the inner air bag 232 and the outer air bag 242, the outer air bag 242 is inflated towards the direction of the outer wall of the pipeline due to the limitation of the peripheral outer steel ring 241 so as to fill the gap between the outer steel ring 241 and the outer wall of the pipeline, thereby realizing the sealing fixation of the outer wall of the pipeline, the inner air bag 232 is inflated towards the direction of the inner wall of the pipeline due to the limitation of the inner steel ring 231 so as to fill the gap between the inner steel ring 231 and the inner wall of the pipeline, natural gas enters the natural gas bag 214 along the gas port of the inclined edge 213, the natural gas bag 214 expands and presses the inner gas bag 232, the inner gas bag 232 is pressed while sealing the inner wall of a pipeline, the bottom plate 234 is driven to further drive the connecting plate 233 to move when the natural gas bag 214 expands, the connecting plate 233 drives the bracket 131 to move downwards at the bottom of the regulating groove through the second screw shaft 133, the bottom of the ventilation body 135 is contacted with the surface of the connecting pipe 21, and as the torsion column 132 moves downwards, the blocking rod at the top of the ventilation body 135 is inserted into the gas hole, so that the torsion column 132 is in a closed state, when part of air in the inner gas bag 232 flows back into the torsion column 132 along the gas pipe under the pressing action of the natural gas bag 214, the gas pressure in the torsion column 132 increases, so that the deformation tympanic membrane drives the inserting shaft to move until the inserting shaft is inserted into the regulating groove to fix the torsion column 132, and when the outer wall of the pipeline is pressed and fixed, the pipeline can be prevented from being collapsed by sealing and fixing the inner wall of the pipeline to provide an outward supporting force so as to counteract part of the inward pressing force.

In this embodiment, in order to facilitate the sealing and fixing of the outer wall of the pipeline, the outer sealing body 24 includes an outer steel ring 241 disposed on the inner side of the inner groove 212 and located at the outer side, an outer air bag 242 is disposed in a groove on the inner side of the outer steel ring 241, the outer air bag 242 is connected with an air ventilation structure through an air pipe, the air ventilation structure fills air into the outer air bag 242 through the air pipe, the outer air bag 242 expands due to the increase of the volume of air in the air bag, and due to the limitation of the outer steel ring 241, the outer air bag 242 expands towards the direction of the outer wall of the pipeline to fill the gap between the outer steel ring 241 and the outer wall of the pipeline, thereby realizing the sealing and fixing of the outer wall of the pipeline.

In order to facilitate the sealing and fixing of the inner wall of the pipeline, the inner sealing body 23 comprises an inner steel ring 231 arranged on the inner side of the inner groove 212, an inner air bag 232 is arranged in a groove on the outer side of the inner steel ring 231, the inner air bag 232 is connected with an air ventilation structure through an air pipe, the natural air bag 214 is positioned outside the groove on the outer side of the inner steel ring 231, the air ventilation structure is used for filling air into the inner air bag 232 through the air pipe, the inner air bag 232 is inflated towards the inner wall of the pipeline under the limiting effect of the inner steel ring 231, so that gaps between the inner steel ring 231 and the inner wall of the pipeline are filled, when the pipeline is filled with natural gas, the natural gas enters the natural air bag 214 through an air port of the bevel edge 213, so that the natural air bag 214 is inflated to squeeze the inner air bag 232, the inner air bag 232 is pressed while the sealing of the inner wall of the pipeline is ensured, and part of the air in the inner air bag 232 is refluxed into the regulating body 13 through the air ventilation structure.

In order to facilitate the movement of the two ends of the connecting pipe 21, the adjusting body 13 comprises a bracket 131 inserted into the bottom of the adjusting groove and a torsion column 132 positioned in the adjusting groove, the bottom of the torsion column 132 is rotationally connected with the bracket 131, the side walls of the two ends of the bracket 131 are rotationally connected with a second screw shaft 133, the bottom of the bracket 131 is in gear engagement with one end of the second screw shaft 133 close to the bracket 131, the pressure transmission structure comprises a connecting plate 233 inserted and matched with the surface of the connecting pipe 21, the second screw shaft 133 penetrates through the connecting plate 233, the second screw shaft 133 is in threaded connection with the connecting plate 233, a bottom plate 234 is inserted into the bottom of the connecting plate 233, the other end of the bottom plate 234 is positioned between the inner air bag 232 and the natural air bag 214, the torsion column 132 is rotated in the adjusting groove, so that the second screw shaft 133 rotates to drive the two ends of the connecting pipe 21 to move through the connecting plate 233 inserted into the connecting pipe 21, and when the natural air enters the natural air bag 214 to expand the inner air bag 232 to squeeze the inner air bag 232, the expansion of the natural air bag 214 drives the bottom plate 234 to move, and the connecting plate 233 is driven to move through the second screw shaft 133 to drive the connecting plate 131 to move downwards at the bottom of the adjusting groove until the ventilating structure is sealed.

In order to be convenient for to the inflation of interior air bag 232 and outer air bag 242, the ventilation structure includes with the complex ventilation body 135 of pegging graft of torsion column 132 bottom, ventilation body 135 is hollow structure, ventilation body 135 bottom both ends are connected with the trachea, the gas pocket has been seted up at torsion column 132 top, ventilation body 135 top correspondence is equipped with the putty stick, inject the air into torsion column 132 through the gas pocket, the air gets into the trachea through ventilation body 135 and then aerifys interior air bag 232 and outer air bag 242, make interior air bag 232 and outer air bag 242 inflation, when bracket 131 drove torsion column 132 and move down in the adjustment tank, ventilation body 135 bottom and connecting pipe 21 surface contact, and as torsion column 132 continues to move down, the putty stick at ventilation body 135 top inserts in the gas pocket, lead to in torsion column 132 in the confined state, the bolt structure is moved to the promotion by the air that the department of interior air bag 232 flows back.

In order to avoid the torsion column 132 from moving downwards in the adjusting groove when the torsion column 132 is rotated, the outer wall of the torsion column 132 is provided with a circular ring plate, the outer wall of the torsion column 132 is sleeved with a supporting ring 134, a plurality of vertical rods spliced with the circular ring plate are symmetrically arranged at the top of the supporting ring 134, springs are arranged on the surfaces of the vertical rods, the vertical rods are contacted with the surface of the circular ring plate through the arranged springs, and the supporting rings 134 are arranged, so that the torsion column 132 cannot move downwards in the adjusting groove due to the supporting of the supporting rings 134 when the torsion column 132 is rotated, and when the natural air bag 214 extrudes the inner air bag 232 to enable the bracket 131 to move downwards in the adjusting groove, the elasticity of the springs can be overcome so that the torsion column 132 can conveniently move downwards in the adjusting groove.

In order to be convenient for to the fixed of turning round post 132, the perforation that runs through its surface has been seted up to turning round post 132 lateral wall, the bolt structure is including being located the eardrum of perforation and the inserted shaft of being connected with the eardrum, in air bag 232 in the air reflux to turning round post 132, and when being sealed in the turning round post 132, the atmospheric pressure in the turning round post 132 increases and makes the eardrum warp and drives the inserted shaft and remove, until the inserted shaft inserts the fixed of realizing turning round post 132 in the adjustment tank, when can avoiding the pipeline to let in natural gas, because the pipeline gas leakage condition that the unexpected rotation of turning round post 132 led to.

In order to facilitate connection of the pipeline, the surface of the end sleeve ring 12 is symmetrically provided with a ring opening, a screw 121 is connected with the ring opening in a threaded manner, one end of the screw 121 close to the pipeline is rotationally connected with a pressing plate 122, and the screw 121 drives the pressing plate 122 to be close to and extrude and fix the outer wall of the pipeline through rotating the screw 121 in the ring opening, so that connection of the pipeline is facilitated.

In order to facilitate adjustment of the distance between two pipelines, two ends of the adjusting bracket 11 are in plug-in fit with the end collars 12, the middle parts of two sides of the adjusting bracket 11 are rotationally connected with first screw shafts 112, the first screw shafts 112 penetrate through the end collars 12, the first screw shafts 112 are in threaded connection with the end collars 12, and the first screw shafts 112 are rotated in a threaded connection mode to drive the end collars 12 to move, so that the distance between the two end collars 12 is adjusted, and the distance between the two pipelines is adjusted.

A second object of the present embodiment is to provide a method for sealing with a sealing device for a natural gas pipeline, including the following method steps:

s1, after the end sleeve ring 12 is used for fixing a pipeline, the torsion column 132 is rotated in the adjusting groove, the torsion column 132 drives the second screw shaft 133 to rotate, and then the connecting plates 233 inserted with the connecting pipes 21 drive the two ends of the connecting pipes 21 to move until the two ends of the connecting pipes 21 enter the pipeline;

s2, injecting air into the torsion column 132 through the air holes, and inflating the inner air bag 232 and the outer air bag 242 through the air pipes, wherein the outer air bag 242 expands towards the direction of the outer wall of the pipeline to fill the gap between the outer steel ring 241 and the outer wall of the pipeline, and the inner air bag 232 expands towards the direction of the inner wall of the pipeline to fill the gap between the inner steel ring 231 and the inner wall of the pipeline;

s3, natural gas is introduced into the pipeline, and the natural gas bag 214 expands and presses the inner air bag 232;

s4, the natural air bag 214 expands to drive the connecting plate 233 to move, and then the bracket 131 is driven to move downwards until the blocking rod is inserted into the air hole, air in the inner air bag 232 flows back into the torsion column 132 along the air pipe, and the air pressure in the torsion column 132 is increased to enable the tympanic membrane to deform to drive the inserting shaft to move until the inserting shaft is inserted into the adjusting groove.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A sealing device for a natural gas pipeline, characterized in that: including butt joint body (1) and sealing body (2) that set up in butt joint body (1), butt joint body (1) is including adjusting support (11), adjusting support (11) both ends symmetry is equipped with end collar (12) that are used for connecting the pipeline, adjusting support (11) middle part has been seted up and has been run through its upper and lower surface's adjustment tank, be equipped with adjusting body (13) in the adjustment tank, adjusting support (11) bottom symmetry is equipped with hoop (111), sealing body (2) are including being located connecting pipe (21) in hoop (111), connecting pipe (21) both ends symmetry is equipped with end pipe (211), end pipe (211) inner wall has been seted up inside groove (212), be equipped with seal structure (22) in inside groove (212), seal structure (22) include inner seal body (23) and be located outer seal body (24) in the inner wall outside of inner seal body (23), outer seal body (24) and pipeline outer wall contact, be equipped with hoop (111) bottom symmetry, be equipped with in adjusting body (13) and be equipped with end pipe (211) symmetry are equipped with end pipe (211), the gas port (213) are equipped with through inner seal structure (213) in the inner seal edge (213), the natural air bag (214) is in contact with the inner sealing body (23), the inner sealing body (23) is provided with a pressure transmission structure, the adjusting body (13) is further provided with a bolt structure for being clamped into the adjusting groove, the pressure transmission structure is in threaded connection with the adjusting body (13), the natural air bag (214) is inflated and expanded to extrude the inner sealing body (23), and air in the inner sealing body (23) flows back to the adjusting body (13) through the ventilation structure to push the bolt structure to be clamped into the adjusting groove.

2. The sealing device for natural gas pipelines according to claim 1, wherein: the outer sealing body (24) comprises an outer steel ring (241) arranged outside the inner groove (212), an outer air bag (242) is arranged in a groove on the inner side of the outer steel ring (241), and the outer air bag (242) is connected with the ventilation structure through an air pipe.

3. The sealing device for natural gas pipelines according to claim 1, wherein: the inner sealing body (23) comprises an inner steel ring (231) arranged on the inner side of the inner groove (212), an inner air bag (232) is arranged in a groove on the outer side of the inner steel ring (231), the inner air bag (232) is connected with the ventilation structure through an air pipe, the natural air bag (214) is positioned outside the groove on the outer side of the inner steel ring (231), and the natural air bag (214) is in contact with the inner air bag (232).

4. A sealing device for natural gas pipelines as claimed in claim 3, wherein: the adjusting body (13) comprises a bracket (131) and a torsion column (132) which are inserted into the bottom of the adjusting groove, the bottom of the torsion column (132) is rotationally connected with the bracket (131), a second screw shaft (133) is rotationally connected to the side walls of two ends of the bracket (131), the bottom of the bracket (131) is close to one end of the bracket (131) and is in gear engagement with one end of the bracket (131), the pressure transmission structure comprises a connecting plate (233) which is inserted into the surface of the connecting pipe (21), the second screw shaft (133) is in threaded connection with the connecting plate (233), a bottom plate (234) is inserted into the bottom of the connecting plate (233), and the other end of the bottom plate (234) is located between the inner air bag (232) and the natural air bag (214).

5. The sealing device for natural gas pipelines according to claim 4, wherein: the ventilation structure comprises a ventilation body (135) which is in plug-in connection with the bottom of the torsion column (132), the ventilation body (135) is of a hollow structure, two ends of the bottom of the ventilation body (135) are connected with the air pipes, air holes are formed in the top of the torsion column (132), and a blocking rod is correspondingly arranged at the top of the ventilation body (135).

6. The sealing device for natural gas pipelines according to claim 4, wherein: the torsion column is characterized in that a circular ring plate is arranged on the outer wall of the torsion column (132), a supporting ring (134) is sleeved on the outer wall of the torsion column (132), a plurality of vertical rods which are inserted into the circular ring plate are symmetrically arranged at the top of the supporting ring (134), springs are arranged on the surfaces of the vertical rods, and the vertical rods are in surface contact with the circular ring plate through the arranged springs.

7. The sealing device for natural gas pipelines according to claim 4, wherein: the side wall of the torsion column (132) is provided with a perforation penetrating through the surface of the torsion column, and the plug pin structure comprises a tympanic membrane positioned in the perforation and a plug shaft connected with the tympanic membrane.

8. The sealing device for natural gas pipelines according to claim 1, wherein: the end sleeve ring (12) is characterized in that ring openings are symmetrically formed in the surface of the end sleeve ring, a screw rod (121) is connected with the ring openings in a threaded mode, and a pressing plate (122) is connected to one end, close to a pipeline, of the screw rod (121) in a rotating mode.

9. The sealing device for natural gas pipelines according to claim 8, wherein: the two ends of the adjusting support (11) are in plug-in fit with the end sleeve rings (12), first screw shafts (112) are rotatably connected to the middle parts of two sides of the adjusting support (11), the first screw shafts (112) penetrate through the end sleeve rings (12), and the first screw shafts (112) are in threaded connection with the end sleeve rings (12).

10. A method of sealing a natural gas pipeline using a sealing device according to any one of claims 1 to 9, comprising the method steps of:

s1, after the end sleeve ring (12) is used for fixing a pipeline, a torsion column (132) is rotated in an adjusting groove, the torsion column (132) drives a second screw shaft (133) to rotate, and then the connecting plates (233) connected with the connecting pipes (21) in an inserting way drive the two ends of the connecting pipes (21) to move until the two ends of the connecting pipes (21) enter the pipeline;

s2, injecting air into the torsion column (132) through the air hole, and inflating an inner air bag (232) and an outer air bag (242) through the air pipe, wherein the outer air bag (242) expands towards the outer wall of the pipeline, and the inner air bag (232) expands towards the inner wall of the pipeline;

s3, natural gas is introduced into the pipeline, and the natural gas bag (214) expands and extrudes the inner air bag (232);

s4, the natural air bag (214) expands to drive the connecting plate (233) to move, the bracket (131) is driven to move downwards until the blocking rod is inserted into the air hole, air in the inner air bag (232) flows back into the torsion column (132) along the air pipe, and the tympanic membrane deforms to drive the inserting shaft to move until the inserting shaft is inserted into the adjusting groove.