CN115574162A - Seal structure that LNG liquefied gas pipeline connects - Google Patents

Seal structure that LNG liquefied gas pipeline connects Download PDF

Info

Publication number
CN115574162A
CN115574162A CN202211461505.9A CN202211461505A CN115574162A CN 115574162 A CN115574162 A CN 115574162A CN 202211461505 A CN202211461505 A CN 202211461505A CN 115574162 A CN115574162 A CN 115574162A
Authority
CN
China
Prior art keywords
sealing
liquefied gas
mounting
connection
lng liquefied
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202211461505.9A
Other languages
Chinese (zh)
Other versions
CN115574162B (en
Inventor
梅春晓
陆阳
李贺彬
王韬
张云峰
左鹏亮
李强
李新玲
孔令臣
桂建达
王�琦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caofeidian Xintian Lng Co ltd
Original Assignee
Caofeidian Xintian Lng Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caofeidian Xintian Lng Co ltd filed Critical Caofeidian Xintian Lng Co ltd
Priority to CN202211461505.9A priority Critical patent/CN115574162B/en
Publication of CN115574162A publication Critical patent/CN115574162A/en
Application granted granted Critical
Publication of CN115574162B publication Critical patent/CN115574162B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/03—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings placed in the socket before connection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/0847—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of hooks
    • F16L37/0848—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of hooks rocking freely
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Insulation (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention relates to the technical field of pipe fittings or pipe joints, in particular to a sealing structure for connecting LNG liquefied gas pipelines, which comprises a connecting pipe body arranged on two adjacent LNG liquefied gas pipelines and a quick-connection assembly used for connecting the two adjacent LNG liquefied gas pipelines, wherein the quick-connection assembly is positioned in the connecting pipe body and forms a first sealing cavity with the inner wall of the connecting pipe body, and a sealing unit is arranged in the first sealing cavity; the invention has reasonable structural design, fully seals the joint of the liquefied gas pipeline by utilizing the multi-stage sealing structure and the constraint component, combines the cooperation with the fixed component, further improves the adaptability of the pipeline in the connection process, reduces the phenomenon of gas plug breaking and flowing caused by the vaporization of liquefied natural gas due to heating by adopting the heat insulation filler to a certain extent, further ensures the safe operation of the pipeline while improving the pipeline sealing effect, and is suitable for mass popularization.

Description

Seal structure that LNG liquefied gas pipeline connects
Technical Field
The invention relates to the technical field of pipe fittings or pipe joints, in particular to a sealing structure for connecting LNG liquefied gas pipelines.
Background
The main component of liquefied natural gas is methane, which is generally known as the cleanest fossil energy on earth, and is mainly used as main fuel for industrial enterprises such as power plants, heat energy, heating and the like, as well as fuel for catering industry and civil use, and is also a main raw material in chemical industry, and an ideal substitute for gasoline and diesel oil in motor vehicles; the liquefied natural gas is colorless, tasteless, nontoxic and noncorrosive, the volume of the liquefied natural gas is about 1/625 of the volume of the gaseous natural gas with the same weight, the mass of the liquefied natural gas is only about 45% of the same volume of water, pipelines are required to be used in the liquefied natural gas conveying process, and the pipelines are required to be connected through joints.
However, the sealing of the LNG pipeline at the joint is not an negligible problem, and in view of the physical properties of easy diffusion and the chemical properties of flammability and explosiveness of LNG, in order to prevent leakage and fire, it is necessary to design a structure at the joint of the LNG pipeline so that the sealing performance and the thermal insulation performance of the joint are further improved to ensure safe and efficient operation of the LNG pipeline.
The sealing structure in the prior art has single function, has defects in sealing effect, and cannot avoid the phenomenon of gas plug-off flow caused by vaporization of liquid natural gas at high temperature, so that the invention provides the sealing structure for liquefied gas pipeline connection, which has high sealing strength and heat preservation and leakage prevention functions.
Disclosure of Invention
The purpose of the invention is as follows: the problems of single function, poor sealing effect and the like of a liquefied natural gas pipeline connecting and sealing structure in the prior art are solved, and the LNG liquefied gas pipeline connecting and sealing structure with the functions of heat preservation and leakage prevention is provided.
The technical scheme of the invention is as follows: a sealing structure for connecting LNG liquefied gas pipelines comprises a connecting pipe body arranged on two adjacent LNG liquefied gas pipelines and a quick-connection assembly used for connecting the two adjacent LNG liquefied gas pipelines, wherein the quick-connection assembly is positioned in the connecting pipe body and forms a first sealing cavity with the inner wall of the connecting pipe body, and a sealing unit is arranged in the first sealing cavity;
the connecting pipe body comprises an external pipe shell and an installation shell arranged inside the external pipe shell;
the sealing unit comprises a mounting substrate mounted on the mounting shell, an internal sealing module mounted on the mounting substrate, and an external sealing layer for sealing the internal sealing module;
the built-in sealing module comprises a sealing sleeve assembly which can be movably sleeved at the joint of the LNG liquefied gas pipeline and a constraint assembly which is arranged on the mounting substrate and is used for constraining the distance between the sealing sleeve assembly and the LNG liquefied gas pipeline; and a constraint cavity is formed between the sealing sleeve assembly and the mounting substrate, and the external sealing layer is arranged in the constraint cavity.
Further, a second sealed cavity is formed among the external tube shell, the mounting shell and the mounting substrate; a heat-insulating packing layer is filled in the second sealing cavity; the inner wall of the mounting substrate is provided with a threading groove, and the inner wall of the mounting substrate is provided with an embedding groove; the mounting shell is provided with a threading hole corresponding to the threading groove; the mounting shell is provided with a filling hole; the heat preservation packing layer can further guarantee the heat preservation nature, the leakproofness of natural gas.
Further, the restraint assembly comprises a restraint strap group which penetrates through the mounting base plate and can be movably wound on the outer side wall of the sealing sleeve assembly, and a tight-bundle adjusting assembly for adjusting the contraction degree of the restraint strap group; the tight-binding adjusting assembly comprises a plurality of adjusting blocks which are embedded in the embedding grooves, and pull wires which are connected with each adjusting block and sequentially penetrate through the threading grooves and the threading holes; the restraint strap group penetrates through the adjusting block; through the cooperation of the restraint strap group and the tight bundle adjusting assembly, the tight bundle of the sealing sleeve assembly can be realized, so that the sealing performance of the sealing sleeve assembly is effectively improved, and the leakage of natural gas is further avoided.
The connecting pipe further comprises a fixing component, wherein the fixing component comprises a fixing piece and an aperture adjusting module, the fixing piece can be movably sleeved with two ends of the connecting pipe body respectively, and the aperture adjusting module is arranged on the fixing piece; the fixing piece comprises a fixing piece body and connecting pieces which are respectively arranged on the fixing piece body and are used for being connected with the mounting shell; the connecting piece can be arranged on the mounting shell; the aperture adjusting module comprises mounting blocks respectively arranged on the fixing pieces, a plurality of adjusting bolts respectively arranged on the mounting blocks, and a plurality of layers of sealing gaskets arranged in the mounting blocks; the fixing pieces act on the natural gas pipelines at two ends, so that the natural gas pipelines are prevented from sliding off due to the fact that the natural gas pipelines are not connected; adjusting bolt can finely tune to the natural gas line internal diameter of difference, realizes the fixed to natural gas line, sets up and can play further sealed effect at the inside sealed pad of installation piece.
Furthermore, the quick connection assembly comprises two quick connection joints which can be correspondingly connected with two adjacent liquefied natural gas pipelines one by one; the quick-connection joint comprises a quick-connection unit and a connection unit, wherein one end of the quick-connection unit can be connected with an LNG liquefied gas pipeline, and the connection unit is arranged at the other end of the quick-connection unit; the two quick connectors are connected with each other through a connecting unit; two adjacent LNG liquefied gas pipeline junctions are connected with the quick connector, and the quick connection structure can make the pipeline connection more convenient.
Furthermore, the quick connection unit comprises a connecting pipe, a clamping jaw which is arranged on the inner wall of the connecting pipe and can clamp the LNG liquefied gas pipeline, a release sleeve of which one end extends into the connecting pipe and is clamped on the inner wall of the clamping jaw, and a guide sleeve which is arranged on the inner wall of the connecting pipe and is used for locking the clamping jaw;
the connecting unit comprises mounting rings which are sleeved on the connecting ends of the two quick-connecting units and provided with clamping grooves, and clamping blocks arranged on the clamping grooves; the joint unit department carries out the screens through the jack catch to LNG liquefied gas pipeline, through uide bushing increase jack catch clamping-force, realizes LNG liquefied gas pipeline's high-speed joint, and the release cover can guarantee to connect the secondary of unit soon simultaneously and use. The joint groove and the fixture block that set up on the collar can realize the holistic spacing of quick-witted subassembly, have further guaranteed the steadiness of LNG liquefied gas pipeline.
Furthermore, the clamping groove comprises a clamping groove body and a limiting groove communicated with the clamping groove body; the clamping block comprises a clamping block body corresponding to the clamping groove body and a limiting block which is arranged on the clamping groove body and corresponds to the limiting groove; the special structure of joint groove and fixture block can guarantee to stabilize the joint between two adjacent quick-connect couplings, also realizes spacing two adjacent quick-connect couplings simultaneously through spacing the collar, is favorable to the stable connection between the LNG liquefied gas pipeline.
Furthermore, the mounting ring further comprises a first mounting ring and a second mounting ring connected with the first mounting ring, the first mounting ring comprises a first mounting ring body and a sealing groove arranged on the first mounting ring body, and the second mounting ring comprises a second mounting ring body and a sealing strip arranged on the second mounting ring body and corresponding to the sealing groove; the joint through sealing strip and seal groove sets up and carries out preliminary sealing to LNG liquefied gas pipeline, and the emergence of preliminary prevention natural gas from two adjacent LNG liquefied gas pipeline junctions is revealed.
Furthermore, the seal sleeve assembly comprises a seal sleeve body which is movably sleeved at the joint of the LNG liquefied gas pipeline and forms a third seal cavity with the LNG liquefied gas pipeline, a plurality of groups of fastening lugs which are uniformly arranged on the inner wall of the seal sleeve body, and a built-in seal layer filled in the third seal cavity; the fastening lug of setting on seal cover body inner wall can further play the fixed action to LNG liquefied natural gas pipe.
Furthermore, the fastening lug comprises two first stabilizing plates symmetrically arranged on the inner wall of the seal sleeve body at intervals, a second stabilizing plate arranged between the first stabilizing plates, and cover plates arranged on the first stabilizing plates and the second stabilizing plates; the first stabilizing plate is provided with a feeding hole, and the first stabilizing plate, the second stabilizing plate and the cover plate jointly form a sealed cavity; the inside packing that seals of seal cover body can be realized to the setting in feeding hole on the fastening lug, further prevents that liquefied natural gas from revealing from both ends, and the structure of fastening lug self can be attached to in the LNG liquefied gas pipeline outside simultaneously, has also practiced thrift the consumptive material in the centre gripping inner tube.
Compared with the prior art, the invention has the beneficial effects that: the multi-stage sealing structure is reasonable in structural design, the interface of the liquefied gas pipeline is fully sealed by the multi-stage sealing structure and the restraint assembly and matched with the fixing assembly, the adaptability of the pipeline is further improved in the connection process, the phenomenon of gas plug breaking and flowing caused by heating and vaporizing of liquefied natural gas is reduced to a certain extent by adopting the heat insulation filler, the sealing effect of the pipeline is improved, the safe operation of the pipeline is further ensured, and the multi-stage sealing structure is suitable for being popularized in a large scale.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic view of the structure of the connecting tube body and the mounting substrate according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a sealing unit according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural view of a packing gland assembly and a restriction assembly according to embodiment 1 of the present invention;
FIG. 5 is a cross-sectional view of a boot seal assembly according to embodiment 1 of the present invention;
FIG. 6 is a schematic structural view showing a connection relationship between a boot seal assembly and a constraint assembly according to embodiment 1 of the present invention;
FIG. 7 is a schematic view of a fastening projection according to embodiment 1 of the present invention;
FIG. 8 is a schematic structural view of a quick-connect unit according to embodiment 1 of the present invention;
FIG. 9 is a schematic view of the structure of a mounting ring according to embodiment 1 of the present invention;
FIG. 10 is a schematic view illustrating a fixture block according to embodiment 1 of the present invention;
FIG. 11 is a schematic structural view of a fixing member according to embodiment 1 of the present invention;
fig. 12 is a schematic structural view of a mounting ring in embodiment 2 of the present invention.
The device comprises a connecting pipe body 1, a connecting pipe body 11, an external pipe shell 11, a mounting shell 12, a threading hole 120, a filling hole 121, a sealing unit 2, a mounting base plate 21, a threading groove 210, an embedding groove 211, a sealing module 22, an internal sealing module 23, an external sealing layer 3, a fixing component 31, a fixing part 311, a fixing part body 312, a connecting part 32, an aperture adjusting module 321, a mounting block 322, an adjusting bolt 323, a sealing gasket 4, a quick-connection component 41, a connecting pipe 411, a clamping claw 412, a releasing sleeve 413, a guide sleeve 414, a connecting unit 42, a mounting ring 421, a clamping groove 4210, a clamping groove 4211, a clamping groove 4212, a limiting groove 4213, a first mounting ring 4214, a second mounting ring 422, a clamping block 4221, a clamping block body 4222, a limiting block, a sealing sleeve component 5, a sealing sleeve body 51, a sealing sleeve 52, a fastening projection 52, a first stabilizing plate, a feeding hole 0, a cover plate 520, a second cover plate 522, a clamping plate 621, a restraining and regulating block 53, a restraining belt regulating component 61, a restraining belt and a restraining belt 61 and a regulating block 61.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "end", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience of describing technical solutions of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1, the sealing structure for connecting LNG liquefied gas pipelines comprises a connecting pipe body 1 installed on two adjacent LNG liquefied gas pipelines, and a quick connection assembly 4 for connecting the two adjacent LNG liquefied gas pipelines, wherein the quick connection assembly 4 is located inside the connecting pipe body 1 and forms a first sealing cavity with the inner wall of the connecting pipe body 1, and a sealing unit 2 is installed in the first sealing cavity;
as shown in fig. 2, the connecting pipe body 1 includes an external case 11, and a mounting case 12 disposed inside the external case 11;
as shown in fig. 2 and 3, the sealing unit 2 includes a mounting substrate 21 mounted on the mounting case 12, an internal sealing module 22 mounted on the mounting substrate 21, and an external sealing layer 23 for sealing the internal sealing module 22; a second sealed cavity is formed among the external tube shell 11, the mounting shell 12 and the mounting substrate 21; a threading groove 210 is arranged in the inner wall of the mounting substrate 21, and an embedding groove 211 is arranged on the inner wall of the mounting substrate 21; the mounting shell 12 is provided with a threading hole 120 corresponding to the threading groove 210; the mounting shell 12 is provided with a filling hole 121;
wherein, the second sealing cavity is filled with a heat-insulating packing layer; the heat-insulating filler is specifically commercially available heat-insulating cotton;
as shown in fig. 4, 5 and 6, the built-in sealing module 22 includes a sealing sleeve assembly 5 movably sleeved at a connection of the LNG liquefied gas pipeline, and a constraint assembly 6 mounted on the mounting substrate 21 and used for constraining a distance between the sealing sleeve assembly 5 and the LNG liquefied gas pipeline; the seal sleeve assembly 5 and the mounting substrate 21 form a constraint cavity, and the external sealing layer 23 is arranged in the constraint cavity; the restraint assembly 6 comprises a restraint strap set 61 which penetrates through the mounting base plate 21 and can be movably wound on the outer side wall of the sealing sleeve assembly 5, and a tight-bound adjusting assembly 62 for adjusting the contraction degree of the restraint strap set 61; the tight-binding adjusting assembly 62 comprises 6 adjusting blocks 621 which are embedded in the embedding grooves 211, and pull wires 622 which are connected with each adjusting block 621 and sequentially pass through the threading grooves 210 and the threading holes 120; the restraint belt group 61 passes through the adjusting block 621;
the sealing sleeve assembly 5 comprises a sealing sleeve body 51 movably sleeved at the joint of the LNG liquefied gas pipeline and forming a third sealing cavity with the LNG liquefied gas pipeline, 4 groups of fastening lugs 52 uniformly arranged on the inner wall of the sealing sleeve body 51, and a built-in sealing layer 53 filled in the third sealing cavity; wherein, each group of fastening projections 52 comprises 10; the built-in sealing layer 53 is specifically made of polyurethane sealant;
as shown in fig. 7, the fastening projection 52 includes two first stabilizing plates 520 symmetrically spaced apart on the inner wall of the seal cartridge body 51, a second stabilizing plate 521 disposed between the first stabilizing plates 520, and a cover plate 522 disposed on the first and second stabilizing plates 520 and 521; the first stabilizing plate 520 is provided with a feeding hole 5200, the first stabilizing plate 520, the second stabilizing plate 521 and the cover plate 522 form a sealed cavity together, and polyurethane sealant is filled in the sealed cavity;
as shown in fig. 8, the quick connection assembly 4 includes two quick connection joints capable of being connected with two adjacent LNG liquefied gas pipelines in a one-to-one correspondence manner; the quick-connection joint comprises a quick-connection unit 41 with one end capable of being connected with the LNG liquefied gas pipeline and a connection unit 42 arranged at the other end of the quick-connection unit 41; the two quick connectors are connected with each other through a connecting unit 42;
the quick connection unit 41 comprises a connecting pipe 411, a clamping jaw 412 which is arranged on the inner wall of the connecting pipe 411 and can clamp the LNG liquefied gas pipeline, a release sleeve 413 of which one end extends into the connecting pipe 411 and is clamped on the inner wall of the clamping jaw 412, and a guide sleeve 414 which is arranged on the inner wall of the connecting pipe 411 and is used for locking the clamping jaw 412;
as shown in fig. 9 and 10, the connecting unit 42 includes a mounting ring 421 sleeved on the connecting ends of the two quick-connecting units 41 and provided with a snap groove 4210, and a latch 422 provided on the snap groove 4210;
the clamping groove 4210 comprises a clamping groove body 4211 and a limiting groove 4212 communicated with the clamping groove body 4211; the fixture block 422 comprises a fixture block body 4221 corresponding to the clamping groove body 4211 and a limiting block 4222 arranged on the clamping groove body 4211 and corresponding to the limiting groove 4212;
example 2
The difference from embodiment 1 is that, as shown in fig. 11, the device further includes a fixing assembly 3, where the fixing assembly 3 includes a fixing member 31 capable of being movably sleeved with two ends of the connecting pipe body 1, and an aperture adjusting module 32 disposed on the fixing member 31; the fixing member 31 includes a fixing member body 311, and connecting members 312 respectively provided on the fixing member body 311 for connection with the mounting case 12, the connecting members 312 being capable of being mounted on the mounting case 12; the aperture adjusting module 32 includes mounting blocks 321 respectively disposed on the fixing members 31, and 2 adjusting bolts 322 respectively disposed on the mounting blocks 321, and a gasket 323 disposed in multiple layers inside the mounting blocks 321.
It should be noted that: in this embodiment, the restraint strap set 61 and the pull wire 622 are commercially available elastic ropes;
the working principle of the embodiment is as follows:
two LNG liquefied gas pipelines to be connected are connected through a quick connection assembly 4, the two LNG liquefied gas pipelines are respectively connected with a quick connection unit 41 on a quick connection joint, after the LNG liquefied gas pipelines are respectively inserted into connecting pipes 411 of the two quick connection joints, clamping claws 412 arranged inside the connecting pipes 411 clamp the LNG liquefied gas pipelines to realize quick connection, after connection, guide sleeves 414 lock the clamping claws 412, and the two adjacent quick connection joints realize quick clamping through clamping grooves 4210 on a mounting ring 421 and clamping blocks 422;
after the two LNG liquefied gas pipelines are communicated, the connecting pipe body 1 is sleeved outside the liquefied gas pipelines, heat insulation cotton is filled in the connecting pipe body 1, and heat insulation is carried out on the inside of the connecting pipe body 1; the fixing pieces 31 on the fixing component 3 are installed at two ends of the installation shell 12 through threads, the adjusting bolts 322 on the aperture adjusting modules 32 are adjusted according to apertures at two ends of the liquefied gas pipeline, and then the fixing component 3 is tightly attached to the liquefied gas pipeline through a plurality of layers of sealing gaskets 323 arranged inside the installation block 321, so that the two ends of the liquefied gas pipeline are further sealed; after filling, a mounting substrate 21 is mounted on the mounting shell 12, a sealing sleeve assembly 5 and a restraint assembly 6 are mounted on the mounting substrate 21, a sealing sleeve body 51 in the sealing sleeve assembly 5 is movably sleeved at a joint of the LNG liquefied gas pipeline, a fastening lug 52 is arranged on the inner wall of the sealing sleeve body 51 to realize further connection with the LNG liquefied gas pipeline, a pull wire 622 which is connected with an adjusting block 621 and penetrates through the mounting substrate 21 is pulled to contract to penetrate through a restraint belt group 61 which is movably wound on the side wall of the sealing sleeve body 51 by the mounting substrate 21, so that the sealing sleeve body 51 can more tightly surround the LNG liquefied gas pipeline, polyurethane sealant is injected into a third sealing cavity formed by the LNG liquefied gas pipeline and the sealing sleeve body 51 through a feed hole 5200 formed in the fastening lug 52, further sealing is realized, leakage of liquefied natural gas is prevented, and the sealing effect of the joint of the two LNG liquefied gas pipelines is effectively enhanced.
Example 3
The difference from example 1 is: as shown in fig. 12, the mounting ring 421 further includes a first mounting ring 4213, and a second mounting ring 4214 connected to the first mounting ring 4213, where the first mounting ring 4213 includes a first mounting ring body and a sealing groove disposed on the first mounting ring body, and the second mounting ring 4214 includes a second mounting ring body and a sealing strip disposed on the second mounting ring body and corresponding to the sealing groove.
Through the joint of the sealing groove between the first mounting ring 4213 and the second mounting ring 4214 and the sealing strip, the primary sealing of the joint of the two LNG liquefied gas pipelines is realized, and the permeation of liquefied natural gas is reduced primarily.

Claims (10)

1. The sealing structure for connecting LNG liquefied gas pipelines is characterized by comprising a connecting pipe body (1) arranged on two adjacent LNG liquefied gas pipelines and a quick-connection assembly (4) used for connecting the two adjacent LNG liquefied gas pipelines, wherein the quick-connection assembly (4) is positioned in the connecting pipe body (1) and forms a first sealing cavity with the inner wall of the connecting pipe body (1), and a sealing unit (2) is arranged in the first sealing cavity;
the connecting pipe body (1) comprises an external pipe shell (11) and an installation shell (12) arranged inside the external pipe shell (11);
the sealing unit (2) comprises a mounting substrate (21) mounted on the mounting shell (12), a built-in sealing module (22) mounted on the mounting substrate (21), and an external sealing layer (23) used for sealing the built-in sealing module (22); the built-in sealing module (22) comprises a sealing sleeve assembly (5) which can be movably sleeved at the joint of the LNG liquefied gas pipeline, and a constraint assembly (6) which is arranged on the mounting base plate (21) and is used for constraining the distance between the sealing sleeve assembly (5) and the LNG liquefied gas pipeline; a constraint cavity is formed between the sealing sleeve assembly (5) and the mounting substrate (21), and the external sealing layer (23) is arranged in the constraint cavity.
2. A liquefied LNG gas pipeline connection seal structure according to claim 1, wherein a second hermetic chamber is formed between the outer shell (11), the mounting shell (12), and the mounting base plate (21); a heat-insulating packing layer is filled in the second sealing cavity; a threading groove (210) is formed in the inner wall of the mounting substrate (21), and an embedding groove (211) is formed in the inner wall of the mounting substrate (21); the mounting shell (12) is provided with a threading hole (120) corresponding to the threading groove (210); the mounting shell (12) is provided with a filling hole (121).
3. A sealing structure for LNG liquefied gas pipe connection according to claim 2, characterized in that the restraint assembly (6) comprises a restraint strap group (61) passing through the mounting base plate (21) and capable of being movably wound around the outer side wall of the sealing sleeve assembly (5), and a tightening adjustment assembly (62) for adjusting the degree of contraction of the restraint strap group (61);
the tight-binding adjusting assembly (62) comprises a plurality of adjusting blocks (621) embedded in the embedding grooves (211), and pull wires (622) which are connected with each adjusting block (621) and sequentially penetrate through the threading grooves (210) and the threading holes (120); the restraint band group (61) passes through the adjusting block (621).
4. The sealing structure for connecting the LNG liquefied gas pipeline according to claim 1, further comprising a fixing assembly (3), wherein the fixing assembly (3) comprises fixing members (31) which can be movably sleeved with both ends of the connecting pipe body (1), and an aperture adjusting module (32) arranged on the fixing members (31); the fixing piece (31) comprises a fixing piece body (311) and connecting pieces (312) which are respectively arranged on the fixing piece body (311) and are used for being connected with the mounting shell (12); the connector (312) is mountable on the mounting housing (12); the aperture adjusting module (32) comprises mounting blocks (321) respectively arranged on the fixing piece (31), a plurality of adjusting bolts (322) respectively arranged on the mounting blocks (321), and a plurality of layers of sealing gaskets (323) arranged inside the mounting blocks (321).
5. The sealing structure for connecting LNG liquefied gas pipelines according to claim 1, wherein the quick-connection assembly (4) comprises two quick-connection joints which can be respectively connected with two adjacent LNG liquefied gas pipelines in a one-to-one correspondence manner; the quick-connection joint comprises a quick-connection unit (41) and a connection unit (42), wherein one end of the quick-connection unit (41) can be connected with an LNG liquefied gas pipeline, and the connection unit (42) is arranged at the other end of the quick-connection unit (41); the two quick-connection joints are connected with each other through a connecting unit (42).
6. The LNG liquefied gas pipeline connection sealing structure according to claim 5, wherein the quick connection unit (41) comprises a connection pipe (411), a claw (412) which is arranged on an inner wall of the connection pipe (411) and can clamp the LNG liquefied gas pipeline, a release sleeve (413) which has one end extending into the connection pipe (411) and is clamped on an inner wall of the claw (412), and a guide sleeve (414) which is arranged on an inner wall of the connection pipe (411) and is used for locking the claw (412);
the connecting unit (42) comprises a mounting ring (421) which is sleeved on the connecting end of the quick connecting unit (41) and is provided with a clamping groove (4210), and a clamping block (422) arranged on the clamping groove (4210).
7. The sealing structure for connecting the Liquefied Natural Gas (LNG) pipeline according to claim 6, wherein the clamping groove (4210) comprises a clamping groove body (4211) and a limiting groove (4212) communicated with the clamping groove body (4211); the clamping block (422) comprises a clamping block body (4221) corresponding to the clamping groove body (4211) and a limiting block (4222) arranged on the clamping groove body (4211) and corresponding to the limiting groove (4212).
8. The liquefied natural gas pipeline connection sealing structure according to claim 6, wherein the mounting ring (421) further comprises a first mounting ring (4213), a second mounting ring (4214) connected to the first mounting ring (4213), the first mounting ring (4213) comprises a first mounting ring body and a sealing groove provided on the first mounting ring body, and the second mounting ring (4214) comprises a second mounting ring body and a sealing strip provided on the second mounting ring body and corresponding to the sealing groove.
9. The sealing structure for the connection of the LNG liquefied gas pipeline as claimed in claim 1, wherein the sealing sleeve assembly (5) comprises a sealing sleeve body (51) movably sleeved at the joint of the LNG liquefied gas pipeline and forming a third sealing cavity with the LNG liquefied gas pipeline, a plurality of groups of fastening lugs (52) uniformly arranged on the inner wall of the sealing sleeve body (51), and a built-in sealing layer (53) filled in the third sealing cavity.
10. A sealing structure for LNG liquefied gas pipe connection according to claim 9, wherein the fastening projection (52) comprises two first stabilizing plates (520) symmetrically spaced apart on the inner wall of the seal gland body (51), a second stabilizing plate (521) disposed between the first stabilizing plates (520), and a cover plate (522) disposed on the first stabilizing plate (520) and the second stabilizing plate (521); the first stabilizing plate (520) is provided with a feeding hole (5200), and the first stabilizing plate (520), the second stabilizing plate (521) and the cover plate (522) jointly form a sealed cavity.
CN202211461505.9A 2022-11-17 2022-11-17 Seal structure that LNG liquefied gas pipeline connects Active CN115574162B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211461505.9A CN115574162B (en) 2022-11-17 2022-11-17 Seal structure that LNG liquefied gas pipeline connects

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211461505.9A CN115574162B (en) 2022-11-17 2022-11-17 Seal structure that LNG liquefied gas pipeline connects

Publications (2)

Publication Number Publication Date
CN115574162A true CN115574162A (en) 2023-01-06
CN115574162B CN115574162B (en) 2023-04-18

Family

ID=84588479

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211461505.9A Active CN115574162B (en) 2022-11-17 2022-11-17 Seal structure that LNG liquefied gas pipeline connects

Country Status (1)

Country Link
CN (1) CN115574162B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117189975A (en) * 2023-11-06 2023-12-08 阳信东泰精密金属有限公司 Stainless steel pipe quick connecting assembly with high sealing performance

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1001248A (en) * 1963-07-05 1965-08-11 United States Pipe Foundry A pipe joint and a gasket for use in it
KR20090032732A (en) * 2007-09-28 2009-04-01 한국전력공사 Vacuum tube assembly
CN106286922A (en) * 2016-10-27 2017-01-04 泸州江阳超能燃气有限责任公司 A kind of decompressor for compressed natural gas pressure-reducing gas
CN107690549A (en) * 2015-06-09 2018-02-13 现代重工业株式会社 Ship including gas handling system
CN207893321U (en) * 2017-12-18 2018-09-21 岳莉 Low temperature cold insulation pipe
CN210319005U (en) * 2019-07-17 2020-04-14 青岛正然工贸有限公司 Combined quick connector suitable for connecting various plastic pipelines
US20200191305A1 (en) * 2018-12-17 2020-06-18 Caillau Tightening device comprising a belt and a sealing ring

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1001248A (en) * 1963-07-05 1965-08-11 United States Pipe Foundry A pipe joint and a gasket for use in it
KR20090032732A (en) * 2007-09-28 2009-04-01 한국전력공사 Vacuum tube assembly
CN107690549A (en) * 2015-06-09 2018-02-13 现代重工业株式会社 Ship including gas handling system
CN106286922A (en) * 2016-10-27 2017-01-04 泸州江阳超能燃气有限责任公司 A kind of decompressor for compressed natural gas pressure-reducing gas
CN207893321U (en) * 2017-12-18 2018-09-21 岳莉 Low temperature cold insulation pipe
US20200191305A1 (en) * 2018-12-17 2020-06-18 Caillau Tightening device comprising a belt and a sealing ring
CN210319005U (en) * 2019-07-17 2020-04-14 青岛正然工贸有限公司 Combined quick connector suitable for connecting various plastic pipelines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117189975A (en) * 2023-11-06 2023-12-08 阳信东泰精密金属有限公司 Stainless steel pipe quick connecting assembly with high sealing performance
CN117189975B (en) * 2023-11-06 2024-02-02 阳信东泰精密金属有限公司 Stainless steel pipe quick connecting assembly with high sealing performance

Also Published As

Publication number Publication date
CN115574162B (en) 2023-04-18

Similar Documents

Publication Publication Date Title
CN115574162B (en) Seal structure that LNG liquefied gas pipeline connects
AU2016214078B2 (en) Termination bulkheads for subsea pipe-in-pipe systems
US9175522B2 (en) Connector arrangement for a subsea pipeline
WO2013086191A1 (en) Pipe system with annulus utilization and monitoring
CN115995380B (en) System for manufacturing semiconductor
CN105673963A (en) Tightly mounted oil pipe coupling
CN205859375U (en) LNG immersed pump power line seal nipple
US11600983B2 (en) Interface, method and system for connecting electrical elements
US20220368066A1 (en) Airtight connection unit, airtight connection assembly, airtight container and vaporizer, as well as production method of airtight connection assembly
KR20200023820A (en) Expansion jointing apparatus
CN213299247U (en) Fire-resistant flame-retardant PE pipe
CN217162925U (en) Flame retardant device for catalytic combustion waste gas treatment
CN211175796U (en) Flame-retardant heat-resistant insulating stainless steel corrugated hose for conveying fuel gas
CN215488388U (en) Detachable pipe sleeve for heat insulation of high-temperature gas inlet and outlet pipeline
CN217441023U (en) Anti-leakage connecting pipe
CN218780896U (en) Sealing device for natural gas pipeline interface
CN209146548U (en) A kind of gas sealing pipe structure
CN215908886U (en) Steam pipeline with gas leakage self-checking function
CN220647128U (en) Natural gas pipeline connecting device
CN217402068U (en) Plugging equipment that prefabricated direct-burried insulating tube leakproofness is high
CN220581924U (en) Furnace tube flange structure and reaction furnace
CN220186136U (en) Connecting piece of prefabricated directly buried insulating pipe
CN216976205U (en) Prevention device for coking and blocking pipelines of reformed asphalt tower
KR102582477B1 (en) Integrated explosion-proof sealing fitting device and its installation method
CN212203492U (en) Pipeline connection sealing structure for liquefied natural gas transportation

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant