CN114542846B - Gas pipeline pressurized leakage blocking device and leakage blocking method thereof - Google Patents

Abstract

The invention relates to the technical field of gas pipeline repair, in particular to a gas pipeline leakage blocking device with pressure and a leakage blocking method thereof. The gas pipeline leakage blocking device with pressure comprises a clamp and a leakage blocking mechanism, a first groove is axially formed in the inner ring surface of the clamp, the leakage blocking mechanism can be tightly inserted into the first groove, the leakage blocking mechanism comprises a leakage blocking body which is made of the same material as the pipeline in curvature, an air inlet hole is vertically formed in the bottom of the leakage blocking body, a cylindrical air passage communicated with the air inlet hole is horizontally formed in the inner portion of the leakage blocking body, a check valve component for blocking the air passage is axially arranged in the air passage, the check valve component is connected with a sealing cover or a connecting head in a sealing mode, one end of the connecting head can be inserted into and opened from the check valve component to be communicated with the air passage, and the other end of the connecting head is communicated with an air storage tank through a hose. The invention has high construction efficiency and good plugging effect, can timely release pressure and collect leaked fuel gas in the process of plugging under pressure, reduces the labor intensity of workers and realizes the recycling of energy.

Description

Gas pipeline pressurized leakage blocking device and leakage blocking method thereof

Technical Field

The invention relates to the technical field of gas pipeline repair, in particular to a gas pipeline under-pressure leakage blocking device and a leakage blocking method thereof.

Background

The gas pipeline is generally a steel natural gas pipeline, which refers to a pipeline for transporting natural gas (including associated gas generated by an oil field) from a mining place or a processing plant to a city gas distribution center or industrial enterprise users, and is also called a gas transmission pipeline. Gas pipelines are usually not allowed to be laid overhead for safe operation, and are generally laid underground. The buried laying can protect the pipeline without affecting agricultural cultivation and ground human activities, but still has the following problems: the pipeline laid underground generates more or less cracks and holes due to natural corrosion, chemical corrosion and other natural reasons of the pipeline or artificial reasons of drilling, well drilling, pile driving and the like, and the cracks and the holes cause natural gas leakage. Because natural gas has the characteristics of inflammability, explosiveness and toxicity, once the natural gas in a gas pipeline leaks, the leakage stoppage treatment needs to be carried out in the shortest time possible, and the condition that a large amount of leaked natural gas pollutes the environment and harms the personal safety is avoided.

At present, a gas pipeline with cracks or holes is generally repaired by the following method, namely, firstly, a gas source is cut off, the periphery of the pipeline is cleaned, leakage points leak, then, gas in the gas pipeline is exhausted, and after the fact that combustible gas does not exist in the gas pipeline is ensured, welding and leaking stoppage treatment is carried out on the leakage points. When the method is adopted for construction, the gas in the gas pipeline needs to be exhausted at first, the consumed time is long, in addition, the natural gas in the gas pipeline is exhausted into the atmosphere, the gas resource is wasted, the environment is polluted, and the normal life of people is seriously influenced.

Disclosure of Invention

In order to solve the technical problem, the invention provides a leakage blocking device with pressure for a gas pipeline, which comprises a clamp and a leakage blocking mechanism, wherein a first groove is axially formed in the inner annular surface of the clamp, the leakage blocking mechanism can be tightly inserted into the first groove, the leakage blocking mechanism comprises a leakage blocking body which is made of the same material as the pipeline in curvature, an air inlet hole is vertically formed in the bottom of the leakage blocking body, a cylindrical air passage communicated with the air inlet hole is horizontally formed in the leakage blocking body, a check valve component for blocking the air passage is axially arranged in the air passage, the check valve component is in sealing connection with a sealing cover or a connector, one end of the connector can be inserted into and opened to be communicated with the air passage, and the other end of the connector is communicated with an air storage tank through a hose.

Preferably, the first groove sequentially comprises a first embedded groove and a second embedded groove from inside to outside in the radial direction, the first embedded groove penetrates through two axial ends of the hoop, and the second embedded groove penetrates through one axial end of the hoop; the leakage stoppage body comprises a welding part and a pressure relief part which are integrally formed, the welding part is embedded into the first embedded groove, and the pressure relief part is embedded into the second embedded groove.

Preferably, the air inlet hole sequentially comprises a large round hole and a small round hole from inside to outside in the radial direction, the first O-shaped sealing ring is arranged at the bottom of the leaking stoppage body in an embedded mode around the large round hole, and the second O-shaped sealing ring is arranged at the side wall of the leaking stoppage body in an embedded mode around the air passage.

Preferably, the check valve assembly comprises a check valve body, a cavity communicated with the air passage is arranged in the check valve body, a valve seat and a valve core are arranged in the cavity, the valve core is connected with a core rod, two limiting slide rods perpendicular to the core rod are symmetrically arranged on the core rod, a limiting slide groove corresponding to the limiting slide rod is axially arranged on the inner wall of the check valve body, a spring is arranged between one end of the check valve body, far away from the valve seat, and the limiting slide rods, and the valve core and the core rod form an annular gap with the cavity.

Preferably, the valve seat center department is equipped with venthole, intercommunicating pore and the frustum hole that communicate in proper order, be equipped with first screw thread portion on the venthole, the intercommunicating pore can seal the grafting connector, the frustum hole cooperatees the shutoff with the case of frustum shape the venthole.

Preferably, a step pipe is arranged at the center of one end, facing the valve seat, of the valve core, and a first through hole is radially formed in the step pipe; the connector is including covering the connector body of second O type sealing washer, connector body one end is equipped with third screw thread portion, and the other end is equipped with hose connection pipe, third screw thread portion connect can seal and pass the grafting pipe of intercommunicating pore, the grafting pipe be equipped with the corresponding inserting groove of step pipe.

Preferably, the sealing cover comprises a sealing cover body and a cylindrical second thread part, the sealing cover body covers the second O-shaped sealing ring, and a second groove for accommodating the stepped pipe is arranged in the second thread part.

Preferably, the core rod penetrates through the one-way valve body to be connected with a cylindrical base, an inflatable sealing ring is arranged on the circumference of the base, an air inlet channel is axially arranged, one end of the air inlet channel is communicated with the air passage, the other end of the air inlet channel is communicated with an air inlet of the inflatable sealing ring, and an annular gap is formed between the base and the inner wall of the air passage and between the inflatable sealing ring in an uninflated state and the base; one end of the base, which is far away from the core bar, is fixedly provided with a hollow annular sliding cylinder, the outer annular wall of the sliding cylinder is in sealing sliding abutting joint with the inner wall of the air passage, a second through hole which can be in sliding communication with the air inlet hole is radially arranged, one end of the sliding cylinder, which faces the core bar, is axially provided with a third through hole which is communicated with the air passage, and one of the air inlet channel and the second through hole is communicated with the air inlet hole.

Preferably, base circumference is equipped with the sealing washer mounting groove, radially be equipped with fixed pipe in the sealing washer mounting groove, fixed pipe one end inserts inflatable seal's air inlet, the other end intercommunication inlet channel, fixed pipe with the equal circumference equidistance of air inlet is equipped with a plurality ofly.

The invention provides a leakage stopping method of a gas pipeline leakage stopping device under pressure, which comprises the following steps:

step S100, reducing the pressure of a pipeline to the lowest use pressure of a downstream user;

s200, cleaning the periphery of a leakage section pipeline to expose a leakage point, symmetrically drawing two hoop positioning lines on two sides of the leakage point along the circumferential direction of the pipeline, and symmetrically drawing two leakage stopping positioning lines on two sides of the leakage point along the axial direction of the pipeline;

s300, fixing the hoop between two hoop positioning lines, and enabling a first groove on the hoop to be located between the two leakage stopping positioning lines;

s400, connecting an air outlet of the plugging mechanism with a connector through threads, inserting a plug pipe on the connector with a step pipe on a valve core, pushing the valve core to move in a direction away from a valve seat through the plug pipe, compressing a spring to accumulate elastic potential energy, and connecting the connector with an air storage tank through a hose;

step S500, inserting the plugging mechanism into a first groove of a hoop, screwing the hoop tightly to enable the plugging mechanism to be tightly attached to a pipeline, completely plugging a leakage point, communicating an air inlet hole of the plugging mechanism with the leakage point, and enabling gas leaked from the leakage point to sequentially enter an air storage tank through the air inlet hole, a second through hole, a third through hole, an air passage, a cavity, a first through hole, a connector and a hose;

s600, dispersing the leaked fuel gas around the pipeline through a fan until the detected fuel gas content is less than 100 ppm;

step S700, welding the part of the welding part of the leaking stoppage body, which is exposed out of the hoop, to the pipeline, removing the hoop after welding is finished, and welding the rest part of the welding part to the pipeline;

step S800, removing the connector from the air outlet hole after welding is finished, releasing elastic potential energy by a spring during removal to push the valve core to plug the valve seat, enabling gas leaked from the leakage point to enter an inflatable sealing ring through the air inlet hole, the air inlet channel and the fixed pipe in sequence, and radially expanding the inflatable sealing ring to plug the air passage;

and S900, connecting the sealing cover with the air outlet through threads, welding the sealing cover and the plugging body into a whole, and backfilling the pipeline to finish plugging.

Compared with the prior art, the invention has the following beneficial technical effects:

1. the invention has good plugging effect and high construction efficiency, and gas does not need to be exhausted in the plugging operation process, thereby saving gas resources, and avoiding environmental pollution and harm to personal safety;

2. the leakage stoppage device can collect leaked fuel gas in the construction process, realizes the recycling of energy, can perform pressure relief while performing leakage stoppage operation, reduces the radial pressure of the fuel gas at a leakage point on the leakage stoppage mechanism, and can enable the leakage stoppage mechanism to be tightly clamped on the outer wall of a pipeline only by applying smaller pressure to the leakage stoppage mechanism through the hoop by workers in the construction process, so that the leakage stoppage device is time-saving and labor-saving and has good plugging effect;

3. according to the invention, the hoop applies pressing force to the leakage stopping mechanism, and the first groove on the hoop and the leakage stopping mechanism are designed to be step-shaped, so that the leakage stopping mechanism can be more conveniently positioned in the axial direction and the circumferential direction, and the leakage point on the pipeline is ensured to be quickly and accurately butted with the air inlet hole of the leakage stopping mechanism;

4. the leakage stopping mechanism is provided with the one-way valve assembly, so that an air passage in the leakage stopping mechanism can be automatically stopped after the pressure relief operation is finished, the gas is prevented from leaking, and meanwhile, the one-way valve assembly has double sealing effects of valve sealing and inflatable sealing by switching the gas flow passage, so that the sealing performance of the one-way valve assembly is further improved;

in conclusion, the invention has high construction efficiency and good plugging effect, can timely release pressure and collect leaked fuel gas in the process of plugging under pressure, reduces the labor intensity of workers and realizes the recycling of energy.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a front view of the clamp of FIG. 1;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a front view of the plugging mechanism and the connection head of FIG. 1;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 6 is a perspective view of the check valve assembly;

FIG. 7 is an exploded view of FIG. 6;

FIG. 8 is a schematic structural view of the check valve body;

FIG. 9 is a schematic view of a valve seat;

FIG. 10 is a schematic view of the valve cartridge;

FIG. 11 is a schematic structural view of a base;

FIG. 12 is a schematic structural view of a slide drum;

FIG. 13 is a schematic view of the structure of the inflatable sealing ring;

FIG. 14 is a schematic view of the sealing cap;

FIG. 15 is a schematic structural diagram of a connecting head;

FIG. 16 is a schematic view showing the connection state of the plugging mechanism and the connector;

FIG. 17 is a schematic view showing a state in which the plugging mechanism is connected to the sealing cap;

fig. 18 is a schematic view of the structure of the pipe.

Description of reference numerals:

1. the clamping band comprises a clamping band body, 11, a first groove, 111, a first embedded groove, 112, a second embedded groove, 12, a first clamping band body, 13, a second clamping band body, 14, a bolt, 2, a leakage stopping mechanism, 21, a leakage stopping body, 211, a welding part, 212, a pressure relief part, 22, an air inlet hole, 221, a large round hole, 222, a small round hole, 23, an air passage, 24, a one-way valve assembly, 241, a one-way valve body, 2411, a cavity, 2412, a limiting sliding chute, 242, a valve seat, 2421, an air outlet hole, 2422, a frustum hole, 2423, a first threaded part, 2424, a communication hole, 243, a valve core, 2431, a step pipe, 2432, a first through hole, 244, a core rod, a 2441 limiting sliding rod, 245, a spring, 246, a base, 2461, an air inlet channel, 2462, a sealing ring installation groove, 2463, a fixing pipe, 247, a sliding barrel, 2471, a second through hole, 2472, a third through hole, 248, an inflation sealing ring, a 2481, a sealing ring, a 2425, a 2481, a sealing ring, a, First O type sealing washer, 26, second O type sealing washer, 3, sealed lid, 31, sealed lid body, 32, second screw thread portion, 33, second recess, 4, connector, 41, connector body, 42, third screw thread portion, 43, hose connecting pipe, 44, peg graft pipe, 45, inserting groove, 5, hose, 6, gas holder, 7, pipeline, 71, leak point, 72, clamp alignment line, 73, leaking stoppage alignment line.

Detailed Description

The following description of the embodiments of the present invention refers to the accompanying drawings and examples:

it should be noted that the structures, proportions, sizes, and the like shown in the drawings are only for the purpose of understanding and reading the contents disclosed in the specification, and are not intended to limit the practical conditions of the present invention, and any modifications of the structures, changes of the proportion relationships, or adjustments of the sizes, which do not affect the efficacy and the achievable purpose of the present invention, should fall within the scope of the technical contents disclosed in the present invention.

In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

Example 1

Combine fig. 1 to 5, this embodiment provides a gas pipeline area pressure plugging device, including clamp 1 and leaking stoppage mechanism 2, the interior anchor ring axial of clamp 1 is equipped with first recess 11, leaking stoppage mechanism 2 can closely insert in first recess 11, leaking stoppage mechanism 2 includes with the pipe 7 with the leaking stoppage body 21 of camber with the material, the vertical inlet port 22 that is equipped with in leaking stoppage body 21 bottom, inside level is equipped with the intercommunication the cylindrical air flue 23 of inlet port 22, the axial is equipped with the shutoff in the air flue 23 the check valve subassembly 24 of air flue 23, the sealed lid of check valve subassembly 24 sealing connection 3 or connector 4, connector 4 one end can be inserted and opened check valve subassembly 24 with air flue 23 intercommunication, the other end passes through hose 5 intercommunication gas holder 6.

In the above technical solution, the clamp 1 provides pressing force for the leakage blocking mechanism 2, so that the leakage blocking mechanism 2 can be tightly attached to the outer wall of the pipeline 7, and the structure and the clamping manner of the clamp 1 are not limited, the clamp 1 (as shown in fig. 2) in this embodiment includes two circular arc-shaped first clamp bodies 12 and second clamp bodies 13, both ends of the first clamp body 12 and the second clamp body 13 are provided with connecting lugs, the bolt 14 is in threaded connection with the connecting lugs, the first clamp body 12 and the second clamp body 13 are connected and fixed to be tightly clamped on the pipeline 7, and the first groove 11 is arranged on the inner annular surface at the center of the first clamp body 12; the air inlet hole 22 in the plugging mechanism 2 is butted with a leakage point 71 (shown in fig. 18) of the pipeline 7, and leaked fuel gas is introduced into the air channel 23; the one-way valve assembly 24 can block the air passage 23, and in an initial state, the one-way valve assembly 24 is in a closed state to block a passage between the air passage 23 and the outside, so that gas in the air passage 23 is prevented from leaking; when the connector 4 is hermetically inserted into the one-way valve assembly 24, the air passage 23 is communicated with the connector 4, and the connector 4 conveys leaked fuel gas into the gas storage tank 6 through the hose 5; the sealing cover 3 can further seal the leakage stopping mechanism 2, and effectively prevents gas from leaking.

As shown in fig. 2 and 3, the first groove 11 includes a first insertion groove 111 and a second insertion groove 112 in a radial direction from inside to outside, the first insertion groove 111 penetrates through both axial ends of the band 1, and the second insertion groove 112 penetrates through one axial end of the band 1; as shown in fig. 5, the leakage blocking body 21 includes a welding portion 211 and a pressure relief portion 212 which are integrally formed, the welding portion 211 being inserted into the first insertion groove 111, and the pressure relief portion 212 being inserted into the second insertion groove 112.

In the above technical solution, the first inserting groove 111 and the second inserting groove 112 form a step shape, and the shapes of the welding part 211 and the pressure relief part 212 are adapted to the step shape, so that the axial and circumferential positioning of the leakage stoppage body 21 can be more conveniently performed, and the accurate butt joint of the leakage point 71 on the pipeline 7 and the air inlet 22 on the leakage stoppage body 21 is ensured.

As shown in fig. 5, the air inlet 22 sequentially includes a large circular hole 221 and a small circular hole 222 from inside to outside in a radial direction, the first O-ring 25 is embedded in the bottom of the plugging body 21 around the large circular hole 221, and the second O-ring 26 is embedded in the side wall of the plugging body 21 around the air passage 23.

In the above technical solution, the radial area of the large circular hole 221 of the air inlet 22 is large, which can improve the process tolerance when the air inlet 22 is butted with the leakage point 71, and the radial area of the small circular hole 222 is small, which can improve the adaptability of the air inlet 22 and the air passage 23. The first O-ring 25 is used for plugging a gap between the plugging mechanism body 21 and the pipeline 7, and the second O-ring 26 is used for plugging a gap between the plugging mechanism body 21 and the sealing cover 3 or the connector 4.

The working process of the embodiment is as follows: initially fixing the clamp 1 to the pipeline 7, so that the first groove 11 of the clamp 1 is aligned with the leak 71 of the pipeline 7; one end of the connector 4 is hermetically inserted into the one-way valve assembly 24, so that the air passage 23 in the plugging mechanism 2 is communicated with the connector 4, and the other end of the connector 4 is communicated with the air storage tank 6 through the hose 5; the plugging mechanism 2 is inserted into the first groove 11, the hoop 1 is screwed down, the plugging mechanism 2 is tightly attached to the pipeline 7, the air inlet hole 22 of the plugging mechanism 2 is in sealing butt joint with the leakage point 71 of the pipeline 7, and fuel gas leaked out from the leakage point 71 sequentially passes through the air inlet hole 22, the air passage 23, the connector 4 and the hose 5 to enter the gas storage tank 6. After the content of the leaked fuel gas in the external environment is reduced to a safe value, the welding process is carried out, firstly, a part of the welding part 211 of the leakage stopping mechanism 2 which is not shielded by the hoop 1 is welded with the pipeline 7 into a whole, then, the hoop 1 is dismounted, and the rest part of the welding part 211 which is contacted with the pipeline 7 is welded into a whole. When the welding is finished, the connector 4 is removed, the one-way valve assembly 24 automatically blocks the air passage 23 at the moment, the sealing cover 3 is installed, and the part of the sealing cover 3, which is contacted with the leaking stoppage body 21, is welded into a whole.

In the traditional under-pressure leakage stopping process, in order to resist the pressure of the leakage point 71 during construction, tools such as a jack and the like are usually needed, materials for stopping leakage are pressed on the leakage point 71 by force, time and labor are wasted, and the risk of continuous leakage of fuel gas which is not tightly stopped exists. The gas pipeline leakage blocking device with pressure in the embodiment can collect leaked gas in the construction process, recycle of energy is achieved, pressure can be released in the leakage blocking operation, the gas pressure at the leakage point 71 is guided to be in the axial direction through the radial direction in the pressure releasing process, and the radial pressure of the gas at the leakage point 71 on the leakage blocking mechanism 2 is greatly reduced. In the work progress, the workman only needs to exert less pressure to leaking stoppage mechanism 2 through clamp 1, just can make the inseparable block of leaking stoppage mechanism 2 on the outer wall of pipeline 7, labour saving and time saving, the shutoff is effectual.

Example 2

With reference to fig. 6 to 17, the present embodiment provides a one-way valve assembly 24 suitable for use in embodiment 1, as follows,

as shown in fig. 6 and 7, the check valve assembly 24 includes a check valve body 241, as shown in fig. 8, a cavity 2411 communicating with the air passage 23 is provided inside the check valve body 241, a valve seat 242 and a valve core 243 are provided in the cavity 2411, the valve core 243 is connected to a core rod 244, two limit sliding rods 2441 perpendicular to the core rod 244 are symmetrically provided on the core rod 244, a limit sliding groove 2412 corresponding to the limit sliding rod 2441 is axially provided on an inner wall of the check valve body 241, a spring 245 is provided between one end of the check valve body 241 far from the valve seat 242 and the limit sliding rod 2441, and the valve core 243 and the core rod 244 both form an annular gap with the cavity 2411.

In the above technical solution, the limiting slide bar 2441 plays a role in supporting and limiting the core rod 244, so as to prevent the core rod 244 from rotating circumferentially, and in an initial state, the spring 245 pushes the valve core 243 to close the valve seat 242, so that the check valve assembly 24 is in a closed state.

As shown in fig. 9, an air outlet hole 2421, a communication hole 2424 and a frustum hole 2422 are sequentially arranged at the center of the valve seat 242, the air outlet hole 2421 is provided with a first threaded portion 2423, the communication hole 2424 can be plugged into the connector 4 in a sealing manner, and the frustum hole 2422 and the frustum-shaped valve core 243 are matched to plug the air outlet hole 2421.

In the above technical solution, the first thread part 2423 on the air outlet 2421 may be in threaded connection with the sealing cover 3 or the connector 4, so as to fix the sealing cover 3 or the connector 4 on the check valve assembly 24, and the communication hole 2424 is used for sealingly accommodating the part of the connector 4 inserted into the check valve assembly 24.

As shown in fig. 10, a step pipe 2431 is provided at the center of one end of the valve core 243 facing the valve seat 242, and the step pipe 2431 is radially provided with a first through hole 2432; as shown in fig. 15, the connection head 4 includes a connection head body 41 capable of covering the second O-ring 26, one end of the connection head body 41 is provided with a third thread portion 42, the other end is provided with a hose connection pipe 43, the third thread portion 42 is connected to an insertion pipe 44 capable of passing through the communication hole 2424 in a sealing manner, and the insertion pipe 44 is provided with an insertion groove 45 corresponding to the step pipe 2431.

In the above technical solution, both the step tube 2431 of the valve core 243 and the insertion tube 44 of the connector 4 can be inserted into the communication hole 2424, when the third thread portion 42 of the connector 4 is in threaded connection with the first thread portion 2423 of the valve seat 242, the insertion tube 44 on the connector 4 is inserted into the communication hole 2424 in a sealing manner, the step end of the step tube 2431 is inserted into the insertion groove 45 of the insertion tube 44, the insertion tube 44 pushes the step tube 2431 and the valve core 243 away from the valve seat 242, and the gas in the gas passage 23 flows into the insertion tube 44 through the first through hole 2432 on the step tube 2431. The connector body 41 is matched with the second O-ring 26, so that the one-way valve assembly 24 can be completely plugged, and the sealing effect of the plugging mechanism 2 is further improved.

As shown in fig. 14, the seal cap 3 includes a seal cap body 31 and a cylindrical second screw part 32, the seal cap body 31 covers the second O-ring 26, and a second groove 33 accommodating the stepped tube 2431 is provided in the second screw part 32.

In the above technical solution, the second groove 33 in the sealing cover 3 is used for accommodating a step end of the step pipe 2431, so as to prevent the second thread portion 32 of the sealing cover 3 from generating thrust on the valve core 243 to affect the sealing performance of the valve core 243, and the sealing cover body 31 is matched with the second O-ring 26, so that the one-way valve assembly 24 can be completely sealed, and the sealing effect of the plugging mechanism 2 is further improved.

As shown in fig. 5, 7, 11, 12 and 13, the core rod 244 passes through the check valve body 241 and is connected to a cylindrical base 246, the base 246 is circumferentially provided with a pneumatic sealing ring 248, an air inlet passage 2461 is axially provided, one end of the air inlet passage 2461 is communicated with the air passage 23, the other end is communicated with an air inlet 2481 of the pneumatic sealing ring 248, and an annular gap is formed between the base 246 and the non-pneumatic sealing ring 248 and the inner wall of the air passage 23; a hollow annular sliding cylinder 247 is fixedly arranged at one end of the base 246 far away from the core rod 244, the outer annular wall of the sliding cylinder 247 is in sealing sliding contact with the inner wall of the air passage 23, a second through hole 2471 capable of being in sliding communication with the air inlet hole 22 is radially arranged, a third through hole 2472 communicated with the air passage 23 is axially arranged at one end of the sliding cylinder 247 facing the core rod 244, and one of the air inlet passage 2461 and the second through hole 2471 is communicated with the air inlet hole 22. As shown in fig. 11, the base 246 in this embodiment is preferably of a stepped cylindrical shape with a large diameter end connected to the core rod 244, a pneumatic packing 248 disposed on the outer circumference of the large diameter end, a slide 247 disposed on the outer circumference of the small diameter end, and an air inlet passage 2461 disposed at an end remote from the core rod 244.

In the above technical solution, the base 246, the slide cylinder 247 and the inflatable sealing ring 248 together form an inflatable sealing structure. When the connector 4 is connected with the plugging mechanism 2, the air inlet channel 2461 on the base 246 is plugged by the inner wall of the air passage 23, the gas cannot enter the gas-filled sealing ring 248, and the gas-filled sealing ring 248 in the non-gas-filled state and the inner wall of the air passage 23 form a gap for the gas to pass through. When the connector 4 is detached from the plugging mechanism 2, the air inlet channel 2461 is far away from the inner wall of the air passage 23 and is communicated with the air inlet 22 through the air passage 23, the fuel gas in the air passage 23 enters the inflatable sealing ring 248 through the air inlet channel 2461, and the inflatable sealing ring 248 is inflated and expanded to be in sealing and abutting contact with the inner wall of the air passage 23, so that the air passage 23 is plugged.

As shown in fig. 11 and 13, a sealing ring installation groove 2462 is circumferentially formed in the base 246, a fixing tube 2463 is radially disposed in the sealing ring installation groove 2462, one end of the fixing tube 2463 is inserted into an air inlet 2481 of the inflatable sealing ring 248, the other end of the fixing tube 2463 is communicated with the air inlet channel 2461, and a plurality of fixing tubes 2463 and a plurality of air inlets 2481 are circumferentially and equidistantly disposed.

In the above technical solution, the sealing ring mounting groove 2462 and the fixing tube 2463 play a role in positioning, supporting and inflating the inflatable sealing ring 248, so that the inflatable sealing ring 248 is prevented from sliding axially and circumferentially, and the inflation efficiency is improved.

The working process of the embodiment is as follows: when in use, the connector 4 is in threaded connection with the air outlet 2421 on the valve seat 242, the plug-in pipe 44 on the connector 4 is inserted into the communicating hole 2424 in a sealing manner, the valve core 243 is pushed to move towards the direction away from the valve seat 242 through the step pipe 2431, the base 246 and the sliding cylinder 247 move in the air passage 23 along with the valve core 243, when the valve core 243 stops moving, the air inlet channel 2461 on the base 246 is abutted against the inner wall of the air passage 23 and is blocked by the inner wall, the inflatable sealing ring 248 in the sealing ring mounting groove 2462 is in an uninflated state and forms a gap for gas to pass through with the inner wall of the air passage 23, and the second communicating hole 2471 on the sliding cylinder 247 is communicated with the air inlet 22; in this state, the leak stopping mechanism 2 is inserted into the first groove 11 of the clamp 1 (the clamp 1 is fixed on the pipeline 7 in advance, the connector 4 is connected with the hose 5 and the air storage tank 6 in advance), the air inlet 22 of the leak stopping mechanism 2 is aligned with the leakage point 71 of the pipeline 7, and as shown in fig. 16, the gas leaked from the leakage point 71 passes through the air inlet 22, the second through hole 2471, the third through hole 2472, the air passage 23, the cavity 2411, the first through hole 2432, the connector 4 and the hose 5 in sequence and enters the air storage tank 6; when the connector 4 is detached from the valve seat 242, the spring 245 pushes the valve core 243 to reset, the air outlet 2421 on the valve seat 242 is blocked, the base 246 and the sliding cylinder 247 move towards the valve seat 242 along with the valve core 243, after the valve core 243 stops moving, the air inlet channel 2461 on the base 246 is far away from the inner wall of the air channel 23 and is communicated with the air inlet hole 22 through the air channel 23, the second through hole 2471 on the sliding cylinder 247 is far away from the air inlet hole 22 and is blocked by the inner wall of the air channel 23, as shown in fig. 17, at this time, the gas leaked out from the leakage point 71 sequentially passes through the air inlet hole 22, the air inlet channel 2461 and the fixed pipe 2463 and enters the air charging sealing ring 248, and the air charging sealing ring 248 radially expands to block the air channel 23, thereby further improving the sealing performance of the leakage stopping mechanism 2.

In this embodiment, the one-way valve assembly 24 has a double sealing structure of valve sealing and inflatable sealing by switching the fuel gas flow passage, so that the sealing effect of the one-way valve assembly 24 is further improved.

Example 3

With reference to fig. 1 to 18, the present embodiment provides a method for plugging a gas pipeline under-pressure plugging device, including the following steps:

step S100, reducing the pressure of the pipeline 7 to the lowest use pressure of downstream users (according to construction experience, when the pressure is reduced to 0.5Mpa, all the downstream users are not influenced);

step S200, as shown in FIG. 18, cleaning the periphery of the leakage section pipeline 7 to expose the leakage point 71, symmetrically drawing two hoop positioning lines 72 at two sides of the leakage point 71 along the circumferential direction of the pipeline 7, and symmetrically drawing two leaking stoppage positioning lines 73 at two sides of the leakage point 71 along the axial direction of the pipeline 7;

step S300, fixing the hoop 1 between the two hoop positioning lines 72, and enabling the first groove 11 on the hoop 1 to be located between the two leaking stoppage positioning lines 73;

step S400, connecting the air outlet 2421 of the plugging mechanism 2 with the connector 4 through threads, inserting the inserting pipe 44 on the connector 4 with the step pipe 2431 on the valve core 243, pushing the valve core 243 to move in the direction away from the valve seat 242 by the inserting pipe 44, compressing the spring 245 to accumulate elastic potential energy, and connecting the connector 4 with the air storage tank 6 through the hose 5;

step S500, inserting the leakage stopping mechanism 2 into the first groove 11 of the hoop 1, screwing down the hoop 1 to enable the leakage stopping mechanism 2 to be tightly attached to the pipeline 7, completely stopping the leakage point 71, and communicating the air inlet hole 22 of the leakage stopping mechanism 2 with the leakage point 71, wherein as shown in fig. 16, the gas leaked out from the leakage point 71 sequentially passes through the air inlet hole 22, the second through hole 2471, the third through hole 2472, the air passage 23, the cavity 2411, the first through hole 2432, the connector 4 and the hose 5 to enter the gas storage tank 6;

s600, dispersing the leaked fuel gas around the pipeline 7 through a fan until the detected fuel gas content is less than 100 ppm;

step S700, welding the part, exposed out of the clamp 1, of the welding part 211 of the leakage stoppage body 21 to the pipeline 7, detaching the clamp 1 after welding is finished, and welding the rest part of the welding part 211 to the pipeline 7;

step S800, removing the connector 4 from the air outlet 2421 after the welding is completed, releasing the elastic potential energy by the spring 245 to push the valve plug 243 to block the valve seat 242 during the removal, as shown in fig. 17, allowing the gas leaked from the leakage point 71 to enter the inflatable sealing ring 248 through the air inlet 22, the air inlet channel 2461 and the fixed pipe 2463 in sequence, and allowing the inflatable sealing ring 248 to radially expand to block the air passage 23;

and S900, connecting the sealing cover 3 with the air outlet 2421 through threads, welding the sealing cover and the plugging body 21 into a whole, and backfilling the pipeline 7 to finish plugging.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.

Claims (9)

1. The utility model provides a gas pipeline area presses plugging device, includes clamp (1) and leaking stoppage mechanism (2), its characterized in that, the interior anchor ring axial of clamp (1) is equipped with first recess (11), leaking stoppage mechanism (2) can closely insert in first recess (11), leaking stoppage mechanism (2) include with pipeline (7) with the same leaking stoppage body (21) of camber with the material, leaking stoppage body (21) bottom is vertical to be equipped with inlet port (22), inside level is equipped with the intercommunication cylindrical air flue (23) of inlet port (22), axial is equipped with the shutoff in air flue (23) check valve subassembly (24) of air flue (23), check valve subassembly (24) sealing connection seals lid (3) or connector (4), connector (4) one end can be inserted and opened check valve subassembly (24) with air flue (23) intercommunication, the other end is communicated with an air storage tank (6) through a hose (5);

the first groove (11) sequentially comprises a first embedded groove (111) and a second embedded groove (112) from inside to outside in the radial direction, the first embedded groove (111) penetrates through the two axial ends of the clamp (1), and the second embedded groove (112) penetrates through one axial end of the clamp (1); the leakage stopping body (21) comprises a welding part (211) and a pressure relief part (212) which are integrally formed, the welding part (211) is embedded into the first embedded groove (111), and the pressure relief part (212) is embedded into the second embedded groove (112).

2. The gas pipeline leakage blocking device under pressure as claimed in claim 1, wherein the gas inlet hole (22) comprises a large circular hole (221) and a small circular hole (222) in sequence from inside to outside in a radial direction, the first O-shaped sealing ring (25) is embedded at the bottom of the leakage blocking body (21) around the large circular hole (221), and the second O-shaped sealing ring (26) is embedded at the side wall of the leakage blocking body (21) around the gas passage (23).

3. The gas pipeline pressure plugging device according to claim 2, the one-way valve assembly (24) comprises a one-way valve body (241), a cavity (2411) communicated with the air channel (23) is arranged in the one-way valve body (241), a valve seat (242) and a valve core (243) are arranged in the cavity (2411), the valve core (243) is connected with a core rod (244), two limiting slide bars (2441) which are vertical to the core bar (244) are symmetrically arranged on the core bar (244), a limiting sliding groove (2412) corresponding to the limiting sliding rod (2441) is axially arranged on the inner wall of the one-way valve body (241), a spring (245) is arranged between one end of the one-way valve body (241) far away from the valve seat (242) and the limiting sliding rod (2441), the valve core (243) and the core rod (244) form an annular gap with the cavity (2411).

4. The gas pipeline pressure leakage blocking device according to claim 3, wherein a gas outlet hole (2421), a communication hole (2424) and a frustum hole (2422) which are sequentially communicated are arranged at the center of the valve seat (242), a first threaded portion (2423) is arranged on the gas outlet hole (2421), the communication hole (2424) can be plugged into the connector (4) in a sealing manner, and the frustum hole (2422) is matched with the frustum-shaped valve core (243) to block the gas outlet hole (2421).

5. The gas pipeline pressure leakage blocking device as claimed in claim 4, wherein a step pipe (2431) is arranged at the center of one end of the valve core (243) facing the valve seat (242), and the step pipe (2431) is radially provided with a first through hole (2432); connector (4) are including covering connector body (41) of second O type sealing washer (26), connector body (41) one end is equipped with third screw thread portion (42), and the other end is equipped with hose connection pipe (43), third screw thread portion (42) are connected and can be sealed to be passed grafting pipe (44) of intercommunicating pore (2424), grafting pipe (44) be equipped with corresponding inserting groove (45) of step pipe (2431).

6. The gas pipeline pressure leakage blocking device according to claim 5, wherein the sealing cover (3) comprises a sealing cover body (31) and a cylindrical second threaded part (32), the sealing cover body (31) covers the second O-shaped sealing ring (26), and a second groove (33) for accommodating the stepped pipe (2431) is formed in the second threaded part (32).

7. The gas pipeline leak stopping device with pressure as claimed in claim 6, wherein the core rod (244) passes through the check valve body (241) and is connected to a cylindrical base (246), the base (246) is circumferentially provided with an inflatable sealing ring (248), an air inlet passage (2461) is axially provided, one end of the air inlet passage (2461) is communicated with the gas channel (23), the other end of the air inlet passage is communicated with an air inlet (2481) of the inflatable sealing ring (248), and an annular gap exists between the base (246) and the inflatable sealing ring (248) in an uninflated state and the inner wall of the gas channel (23); one end, far away from the core rod (244), of the base (246) is fixedly provided with a hollow annular sliding barrel (247), the outer annular wall of the sliding barrel (247) is in sealing sliding contact with the inner wall of the air passage (23), a second through hole (2471) capable of being in sliding communication with the air inlet hole (22) is radially arranged, one end, facing the core rod (244), of the sliding barrel (247) is axially provided with a third through hole (2472) communicated with the air passage (23), and one of the air inlet channel (2461) and the second through hole (2471) is communicated with the air inlet hole (22).

8. The gas pipeline pressure leakage blocking device as claimed in claim 7, wherein the base (246) is circumferentially provided with a sealing ring installation groove (2462), the inside of the sealing ring installation groove (2462) is radially provided with a fixed pipe (2463), one end of the fixed pipe (2463) is inserted into the air inlet (2481) of the inflatable sealing ring (248), the other end of the fixed pipe (2463) is communicated with the air inlet channel (2461), and a plurality of the fixed pipes (2463) and the air inlet (2481) are arranged at equal intervals on the circumference.

9. The leakage blocking method of the gas pipeline leakage blocking device under pressure as claimed in claim 8, characterized by comprising the following steps:

step S100, reducing the pressure of the pipeline (7) to the lowest use pressure of a downstream user;

s200, cleaning the periphery of a leakage section pipeline (7) to expose a leakage point (71), symmetrically drawing two hoop positioning lines (72) on two sides of the leakage point (71) along the circumferential direction of the pipeline (7), and symmetrically drawing two leakage stoppage positioning lines (73) on two sides of the leakage point (71) along the axial direction of the pipeline (7);

s300, fixing the hoop (1) between two hoop positioning lines (72), and enabling a first groove (11) on the hoop (1) to be located between two leakage stopping positioning lines (73);

step S400, an air outlet hole (2421) of the plugging mechanism (2) is in threaded connection with a connector (4), an insertion pipe (44) on the connector (4) is inserted into a step pipe (2431) on a valve core (243), the insertion pipe (44) pushes the valve core (243) to move in a direction away from a valve seat (242), a spring (245) is compressed to accumulate elastic potential energy, and the connector (4) is connected with a gas storage tank (6) through a hose (5);

step S500, inserting the leakage stopping mechanism (2) into a first groove (11) of a hoop (1), screwing the hoop (1) to enable the leakage stopping mechanism (2) to be tightly attached to a pipeline (7), completely stopping a leakage point (71), communicating a gas inlet hole (22) of the leakage stopping mechanism (2) with the leakage point (71), and enabling gas leaked out of the leakage point (71) to sequentially pass through the gas inlet hole (22), a second through hole (2471), a third through hole (2472), a gas passage (23), a cavity (2411), a first through hole (2432), a connector (4) and a hose (5) to enter a gas storage tank (6);

s600, dispersing the leaked fuel gas around the pipeline (7) through a fan until the detected fuel gas content is less than 100 ppm;

step S700, welding the part, exposed out of the hoop (1), of the welding part (211) of the leakage stopping body (21) to the pipeline (7), removing the hoop (1) after welding is finished, and welding the rest part of the welding part (211) to the pipeline (7);

step S800, removing the connector (4) from the air outlet hole (2421) after welding is finished, releasing elastic potential energy by a spring (245) to push a valve core (243) to plug a valve seat (242) when the connector is removed, enabling gas leaked from a leakage point (71) to sequentially pass through an air inlet hole (22), an air inlet channel (2461) and a fixed pipe (2463) to enter an inflatable sealing ring (248), and enabling the inflatable sealing ring (248) to radially expand to plug an air passage (23);

and S900, connecting the sealing cover (3) with the air outlet hole (2421) through threads, welding the sealing cover and the plugging body (21) into a whole, and backfilling the pipeline (7) to finish plugging.

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