CN111765312B - Double-layer gas pipeline and connecting structure and manufacturing method thereof - Google Patents

Double-layer gas pipeline and connecting structure and manufacturing method thereof Download PDF

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Publication number
CN111765312B
CN111765312B CN202010625500.XA CN202010625500A CN111765312B CN 111765312 B CN111765312 B CN 111765312B CN 202010625500 A CN202010625500 A CN 202010625500A CN 111765312 B CN111765312 B CN 111765312B
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China
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pipe
joint
external
wall
layer
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Chinese (zh)
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CN111765312A (en
Inventor
吕晓东
张双成
刘艳朝
赵慧恩
尹欢
高洋
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CRRC Dalian Co Ltd
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CRRC Dalian Co Ltd
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    • 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
    • F16L39/00—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies
    • F16L39/005—Joints or fittings for double-walled or multi-channel pipes or pipe assemblies for concentric pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
    • 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
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/02—Welded joints
    • 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
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/005—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts comprising locking means for the threaded member
    • 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
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/06—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends
    • F16L19/063—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends by means of conical threaded surfaces
    • 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
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/06—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends
    • F16L19/07—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends adapted for use in socket or sleeve connections
    • 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
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/06—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends
    • F16L19/075—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends specially adapted for spigot-and-socket joints for pipes of the same diameter

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The invention discloses a double-layer gas pipeline and a connecting structure and a manufacturing method thereof, wherein the double-layer gas pipeline comprises an inner joint, an outer joint and a connecting body, wherein the head end of the inner joint is connected with the tail end of an inner-layer pipe; the head end of the outer joint is connected with the tail end of the outer layer pipe, the tail end of the outer joint is connected with the outer wall of the inner joint, a first cavity is formed between the inner wall of the outer joint and the outer walls of the inner joint and part of the inner layer pipe, and the outer joint is provided with an air guide hole on the wall forming the first cavity; the outer joint is inserted into the outer connecting piece, and a second cavity is formed at the air guide hole by the inner wall of the outer connecting piece and the outer wall of the outer joint; the connector is sleeved on the outer layer pipe and is used for being detachably connected with an external connecting piece. The invention has simple structure and common installation requirement; the inner layer pipe and the outer layer pipe can be matched with a hard steel pipe or a metal hose, and the adaptability of application occasions is high; the scheme has low requirement on processing precision and low processing cost and material cost; the gas leakage guiding part has no throttling, and the gas is guided out smoothly and quickly.

Description

Double-layer gas pipeline and connecting structure and manufacturing method thereof
Technical Field
The invention relates to the technical field of gas delivery, in particular to a double-layer gas pipeline and a connecting structure and a manufacturing method thereof.
Background
Because the fuel gas is dangerous gas and reaches a certain concentration in the environment, the fuel gas can be exploded when meeting open fire, and the fuel gas can cause harm to surrounding equipment, personnel and the environment. For the pipeline for conveying the fuel gas, the key point of safety protection is to prevent the fuel gas inside the pipeline from leaking to the outside. To minimize the risk of gas leakage, the use of a double-deck gas line is an effective solution. After the inner layer pipe used for conveying the fuel gas in the double-layer pipeline is damaged, the fuel gas can flow into the interlayer between the inner layer pipe and the outer layer pipe, and then the fuel gas is discharged to a safety area through the interlayer, so that the fuel gas is prevented from directly leaking to the external environment, and the safety is guaranteed.
The existing double-layer gas pipeline is usually made of alloy steel materials, the rigidity is high, installation errors cannot be compensated well, a flexible double-layer wall gas supply pipe assembly is provided through research, the structure is shown in figures 1-4 and comprises an inner pipe, an outer pipe, an inner pipe head, a joint, an expansion sleeve and a pipe joint, the inner pipe outer sleeve is provided with the outer pipe, a certain gap is reserved between the inner pipe outer wall and the outer pipe inner wall, the inner pipe head is connected with the two ends of the inner pipe, the inner pipe head outer sleeve is provided with the joint, a certain gap is reserved between the joint inner wall and the inner pipe head outer wall, one end of the joint is connected with the inner pipe head through the expansion sleeve, and the other end of the joint is connected with the outer pipe through the pipe joint. The free end on one side of the inner pipe head is a ball head sealing surface, and a thread section is arranged on the inner pipe head on one side of the ball head sealing surface. It still has the following problems:
first, the spherical seal requires a high degree of centering during installation, and improper installation can cause failure of the spherical seal. In order to avoid the problem, the research sets the inner pipe as a stainless steel metal flexible pipe to compensate the installation error, reduces the radial force of the ball head sealing surface on one side of the inner pipe head, and prevents the sealing surface of the supply pipe from being damaged. When the inner and outer layer pipes are both made of steel pipes, the spherical sealing mode adopted by the scheme can cause failure. Resulting in limited application.
Secondly, in order to realize the spherical seal processing on the inner pipe head and use the threaded connection between the expansion sleeve and the inner pipe head, the wall thickness of the inner pipe head must be very thick, which increases the material cost, and the spherical seal processing precision requirement is higher and the processing cost is higher.
Thirdly, when the end face seal fails, the leaked fuel gas can firstly pass through a narrow space between the cylindrical surface of the expansion sleeve and the inner side surface of the joint, then enters the vent groove of the expansion sleeve, and finally is guided into the interlayer between the inner layer pipe and the outer layer pipe. According to the structure diagram of the scheme, the gas guide-out sectional area at the end part is smaller than the interlayer sectional area between the inner layer pipe and the outer layer pipe, the gas is throttled at the end part, once the sealing surface at the end part leaks, a large amount of gas leaks, and the structure is not beneficial to quickly guiding out the leaked gas.
Based on this, the prior art still remains to be improved.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a double-layer gas pipeline, a connection structure for connecting the double-layer gas pipeline with an external interface, and a manufacturing method of the double-layer gas pipeline, so as to solve the problems in the prior art.
On one hand, the connecting structure for connecting the double-layer gas pipeline and the external interface, disclosed by the embodiment of the invention, comprises an inner joint, an outer joint and a connecting body, wherein,
the head end of the inner joint is hermetically connected with the tail end of the inner-layer pipe and is used for communicating the inner-layer pipe into an external interface;
the head end of the outer joint is hermetically connected with the tail end of the outer layer pipe, the tail end of the outer joint is hermetically connected with the outer wall of the inner joint, a first cavity is formed between the inner wall of the outer joint and the outer walls of the inner joint and part of the inner layer pipe, and the outer joint is provided with an air guide hole on the wall forming the first cavity;
the external interface is provided with an external connecting piece, an external connector is inserted into the external connecting piece, and a second cavity is formed at the air guide hole by the inner wall of the external connecting piece and the outer wall of the external connector;
the connector is sleeved on the outer layer pipe and is used for being detachably connected with the external connecting piece.
Furthermore, a first sealing ring is arranged on the outer wall of the outer joint, a second sealing ring is arranged on the outer wall of the inner joint, and the second cavity is positioned between the first sealing ring and the second sealing ring;
the inner wall of the external connecting piece is in air-tight sealing connection with the outer wall of the external joint at the first sealing ring;
the inner wall of the outer connector is in air tight connection with the outer wall of the nipple at the second sealing ring.
Further, the inner joint comprises an inner pipe connecting part at the head end and an outer joint connecting part at the tail end;
the outer diameter of the outer joint connecting portion is larger than that of the inner-layer pipe connecting portion, so that a first step is formed at the joint of the outer joint connecting portion and the inner-layer pipe connecting portion, and the tail end of the outer joint is welded on the first step.
Further, the second sealing ring is arranged on the outer wall of the outer joint connecting portion, and specifically, a second O-shaped ring groove for accommodating an O-shaped sealing ring is formed in the outer wall of the outer joint connecting portion.
Further, the external joint comprises a first connecting pipe, a second connecting pipe and a third connecting pipe which are communicated with each other, wherein the inner diameter of the first connecting pipe is not smaller than the outer diameter of the outer layer pipe, the inner diameters of the second connecting pipe and the third connecting pipe are smaller than the outer diameter of the outer layer pipe and larger than the outer diameter of the inner layer pipe, and the head end of the first connecting pipe is welded with the outer layer pipe;
the air guide holes are arranged on the third connecting pipe in the circumferential direction, and an air collection annular belt is formed on the third connecting pipe;
the end of the third connecting pipe is welded on the outer wall of the nipple.
Further, the outer diameters of the first connecting pipe, the second connecting pipe and the third connecting pipe are sequentially reduced; the outer diameter of the third connecting pipe is smaller than that of the first step, so that an annular groove is formed at the third connecting pipe, and the annular groove and the inner wall of the external connecting piece jointly form a second cavity.
Further, the first sealing ring is arranged on the second connecting pipe. Specifically, a first O-shaped ring groove for installing an O-shaped sealing ring is arranged on the second connecting pipe.
Further, the length of the first connecting pipe is greater than that of the inner-layer pipe connecting part. The inner pipe joint is used for exposing the tail end of the inner pipe when being installed so as to weld the inner pipe and the inner joint.
Further, the connecting body comprises a sheathing part and a threaded part;
the inner diameter of the sleeving part is not smaller than the outer diameter of the outer pipe and smaller than the outer diameter of the head end of the outer joint;
the inner diameter of the thread part is not smaller than the outer diameter of the head end of the outer joint, and the thread part is provided with an external thread matched with the internal thread of the head end of the external connecting piece.
Further, the external connecting piece comprises an internal thread part and a cavity forming part which are communicated, the internal thread part is used for being connected with the external thread on the connecting body, and the cavity forming part is sleeved on the outer side of the air guide hole.
Furthermore, the outer joint is provided with an annular groove at the air guide hole to form a second cavity with the inner wall of the external connecting piece.
On the other hand, the embodiment of the invention also discloses a double-layer gas pipeline which comprises an inner layer pipe, an outer layer pipe and the connecting structure for connecting the double-layer gas pipeline with an external interface.
Further, the first cavity forms negative pressure through an air pump.
The embodiment of the invention also discloses a manufacturing method of the double-layer gas pipeline, which comprises the following steps:
sleeving the inner layer pipe into the outer layer pipe, wherein the tail end of the inner layer pipe extends out of the outer layer pipe;
sequentially sleeving the connecting body into the outer layer pipe, and sleeving the head end of the outer joint into the outer layer pipe until the tail end of the inner layer pipe is exposed;
welding the head end of the inner joint with the tail end of the inner-layer pipe;
welding the head end of the outer joint with the tail end of the outer layer pipe, and welding the tail end of the outer joint with the outer wall of the inner joint;
the connector is pushed until the tail end of the connector is sleeved outside the outer joint.
By adopting the technical scheme, the invention at least has the following beneficial effects:
the double-layer gas pipeline is used for the connection structure for connecting the double-layer gas pipeline with the external interface, and the manufacturing method of the double-layer gas pipeline, the external interface structure is simple, and the installation requirement is common; the inner layer pipe and the outer layer pipe of the fuel gas pipeline can be matched with a hard steel pipe and can also be matched with a metal flexible pipe, so that the adaptability of application occasions is high; the scheme has low requirement on processing precision, low processing cost and low material cost; the gas leakage guiding part has no throttling, and the gas is guided out smoothly and quickly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a sectional view of a double-deck gas pipeline connection according to an embodiment of the present invention;
FIG. 2 is a sectional view of the inner joint structure of the connection structure for connecting the double-layer gas pipeline with the external interface according to one embodiment of the invention;
fig. 3 is a sectional view of an external joint structure of a connection structure for connecting a double-layer gas pipeline with an external interface according to an embodiment of the invention;
fig. 4 is a sectional view of a connector structure of a connecting structure for connecting a double-layer gas pipeline with an external interface according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any way in the following embodiments.
As shown in fig. 1 to 4, some embodiments of the present invention disclose a connection structure for connecting a double-layered gas pipeline with an external interface, and a double-layered gas pipeline, including an inner joint 1, an outer joint 3, and a connector 4, wherein,
the head end of the inner joint 1 is hermetically connected with the tail end of the inner-layer pipe 5 and is used for communicating the inner-layer pipe 5 to an external interface;
the head end of the outer joint 3 is hermetically connected with the tail end of the outer layer pipe 6, the tail end of the outer joint 3 is hermetically connected with the outer wall of the inner joint 1, a first cavity 8 is formed between the inner wall of the outer joint 3 and the outer walls of the inner joint 1 and part of the inner layer pipe 5, and the outer joint 3 is provided with an air guide hole 34 on the wall forming the first cavity 8;
the external interface is provided with an external connecting piece 7, the external connecting piece 7 is sleeved outside the external connector 3, and a second cavity 9 is formed between the inner wall of the external connecting piece 7 and the outer wall of the external connector 3 at the air guide hole 34;
the connecting body 4 is sleeved on the outer layer pipe 6 and is detachably connected with the external connecting piece 7.
This embodiment forms first cavity 8 between the inner wall of outer joint 3 and the outer wall of nipple 1 and part inner tube 5, when the connection between nipple 1 and inner tube 5 takes place to leak, can will reveal the gas by first cavity 8 and discharge safely, when the sealed inefficacy between external connecting piece 7 and outer joint 3 to when leading to outside kneck gas to reveal, the gas of revealing firstly gets into second cavity 9, and because the existence of air guide hole 34, the gas of revealing that gets into in the second cavity 9 gets into first cavity 8 afterwards, must discharge smoothly. The external interface has simple structure and common installation requirement; the inner layer pipe 6 and the outer layer pipe 6 of the gas pipeline can be matched with a hard steel pipe and can also be matched with a metal hose, so that the adaptability of application occasions is high; the scheme has low requirement on processing precision and low processing cost and material cost; the gas leakage leading-out part has no throttling, and the gas is smoothly and quickly led out.
In the connection structure for connecting the double-layer gas pipeline and the external interface and the double-layer gas pipeline disclosed by some embodiments of the present invention, on the basis of the above embodiments, a first sealing ring is arranged on the outer wall of the outer joint 3, a second sealing ring is arranged on the outer wall of the inner joint 1, and the second cavity 9 is located between the first sealing ring and the second sealing ring; the inner wall of the external connecting piece 7 is in air-tight connection with the outer wall of the external joint 3 at the first sealing ring; the inner wall of the outer connecting piece 7 is in gas-tight connection with the outer wall of the nipple 1 at the second sealing ring. And the first sealing between the external connecting piece 7 and the connecting structure is realized through a second sealing ring, and if the second sealing ring fails, leaked fuel gas can enter the second cavity 9. And the gas safety under extreme conditions is ensured.
On the basis of the connecting structure for connecting the double-layer gas pipeline and the external interface and the double-layer gas pipeline disclosed by some embodiments of the invention, the inner joint 1 comprises an inner-layer pipe connecting part 13 positioned at the head end and an outer joint connecting part 11 positioned at the tail end;
the outer diameter of the outer joint connecting part 11 is larger than that of the inner pipe connecting part 13, so that a first step 15 is formed at the joint of the outer joint connecting part 11 and the inner pipe connecting part 13, and the tail end of the outer joint 3 is welded on the first step 15.
Specifically, the inner joint 1 may be composed of two end pipes having two different outer diameters, one of which is an inner pipe connecting portion 13 for connecting with the end of the inner pipe 5, the pipe section preferably has the same inner diameter and outer diameter as the inner pipe 5, the other of which is an outer joint connecting portion 11 for connecting with the outer joint 3, the inner diameter of which may be the same as the inner pipe 5, and the outer diameter of which is further preferably larger than the outer diameter of the end of the outer joint 3, when the end of the outer joint 3 abuts and is welded on the first step 15, the end of the outer joint 3 has a height difference with the outer joint connecting portion 11, and the outer diameter of the other end of the outer joint 3 may be set to be the same as the outer diameter of the connecting portion of the outer joint 3, that is, an annular groove having a smaller outer diameter at one end between the other end of the outer joint 3 and the connecting portion of the outer joint 3, the height difference being the depth of the annular groove, in this case, the inner diameter of the external connector 7 is the same as the outer diameters of the connecting portion of the external joint 3 and the other end of the external joint, so that the second cavity 9 becomes an annular cavity.
In the connection structure for connecting the double-layer gas pipeline and the external interface and the double-layer gas pipeline disclosed by some embodiments of the present invention, on the basis of the above embodiments, the second sealing ring is disposed on the outer wall of the outer joint connecting portion 11, and specifically, a second O-ring groove 12 for accommodating the O-ring 2 is disposed on the outer wall of the outer joint connecting portion 11.
The invention discloses a connecting structure for connecting a double-layer gas pipeline with an external interface and the double-layer gas pipeline, on the basis of the above-mentioned embodiment, the outer joint 3 includes the first connecting pipe 31, the second connecting pipe 32 and the third connecting pipe 33 which are communicated with each other, wherein, the inner diameter of the first connecting pipe 31 is not less than the outer diameter of the outer layer pipe 6, so that the first connecting pipe 31 can be sleeved on the outer side of the outer layer pipe 6 and can slide, the inner diameters of the second connecting pipe 32 and the third connecting pipe 33 are smaller than the outer diameter of the outer pipe 6 and larger than the outer diameter of the inner pipe 5, so that on one hand, the sliding of the outer joint on the outer pipe 6 can stop at the second connecting pipe 32, and on the other hand, a gap is ensured between the second connecting pipe 32 and the third connecting pipe 33 and the inner pipe 5 and the inner joint 1 to form the first cavity 8. The head end of the first connecting pipe 31 can be hermetically welded with the outer pipe 6.
In the connection structure for connecting the double-layer gas pipeline and the external interface and the double-layer gas pipeline disclosed in some embodiments of the present invention, on the basis of the above embodiments, a plurality of gas guide holes 34 are circumferentially arranged on the third connecting pipe 33, and a gas collection annulus is formed on the third connecting pipe 33; the gas-guiding holes 34 may be provided for two weeks or more to ensure faster discharge of the leaking gas. The end of the third nipple 33 is welded to the outer wall of the nipple 1, in particular to the first step 15.
In the connection structure for connecting a double-layer gas pipeline and an external interface and the double-layer gas pipeline disclosed in some embodiments of the present invention, on the basis of the above embodiments, the outer diameters of the first connecting pipe 31, the second connecting pipe 32 and the third connecting pipe 33 are sequentially reduced; the outer diameter of the third connecting piece 33 is smaller than the outer diameter of the first step 15, so that an annular groove is formed at the third connecting piece 33, which annular groove together with the inner wall of the outer connecting piece 7 forms the second cavity 9. For the outer joint 3, a tapered slope may be used for the transition at the position where the outer diameter and the inner diameter change.
In the connection structure for connecting the double-layer gas pipeline and the external interface and the double-layer gas pipeline disclosed by some embodiments of the present invention, on the basis of the above embodiments, the first sealing ring is arranged on the second connecting pipe 32. In particular, the second adapter tube 32 is provided with a first O-ring groove 36 for seating the O-ring seal 2.
In the connection structure for connecting a double-layer gas pipeline with an external interface and the double-layer gas pipeline disclosed by some embodiments of the present invention, on the basis of the above embodiments, the length of the first connecting pipe 31 is greater than the length of the inner-layer pipe connecting portion 13. For facilitating the exposure of the end of the inner pipe 5 at the time of installation to facilitate the welding of the inner pipe 5 with the nipple 1.
In the connection structure for connecting a double-layer gas pipeline with an external interface and the double-layer gas pipeline disclosed in some embodiments of the present invention, on the basis of the above embodiments, the connecting body 4 includes a sleeving part 41 and a threaded part 42; the inner diameter of the sheathing part 41 is not less than the outer diameter of the outer layer pipe 6 and is less than the outer diameter of the head end of the outer joint; the threaded portion 42 has an inner diameter not smaller than an outer diameter of the head end of the outer joint, and has an external thread 43 that is engaged with the internal thread of the head end of the outer joint 7. The inner wall of the joint of the sleeving part 41 and the threaded part 42 is in tapered inclined surface transition, meanwhile, the head end of the outer joint 3 can be correspondingly arranged to be a tapered inclined surface, the two tapered inclined surfaces can be used as a spigot, interaction is achieved, and the installation is guaranteed to be tight. The outer wall of the sleeve portion 41 may be formed with an outer hexagon for mounting the handle when the external thread 43 is screwed into the external connection member 7.
In the connection structure for connecting a double-layer gas pipeline and an external interface according to some embodiments of the present invention, based on the above embodiments, the external connector 7 includes a female screw portion 42 and a cavity forming portion, the female screw portion 42 is used for connecting with a male screw 43 on the connector 4, and the cavity forming portion is sleeved outside the gas guide hole 34. The internal diameter of the internal thread part 42 is larger than that of the cavity forming part, and the joint of the internal thread part 42 and the inner wall of the cavity forming part can also be set to be a conical inclined surface which interacts with the conical inclined surfaces of the outer walls of the first connecting pipe 31 and the second connecting pipe 32 of the outer joint 3 to ensure the tightening.
In the connection structure for connecting the double-layer gas pipeline and the external interface and the double-layer gas pipeline disclosed in some embodiments of the present invention, on the basis of the above embodiments, the external joint 3 is provided with an annular groove at the air guide hole 34, and the annular groove is a gas collecting annulus, so as to form a second cavity 9 with the inner wall of the external connecting member 7.
According to the connecting structure for connecting the double-layer gas pipeline and the external interface and the double-layer gas pipeline disclosed by some embodiments of the invention, on the basis of the above embodiments, the first cavity 8 forms negative pressure through the air pump. The gas leakage is further convenient to discharge, and when the first sealing ring and the second sealing ring are both invalid, the safe derivation of the gas can still be ensured. Once the inner pipe 5 leaks or the O-ring fails, the leaked fuel gas is conducted to the interlayer between the inner pipe 5 and the outer pipe 6, namely the first cavity 8, by the action of negative pressure and then guided to a safe area.
The embodiment of the invention also discloses a manufacturing method of the double-layer gas pipeline, which comprises the following steps:
sleeving the inner layer pipe into the outer layer pipe, wherein the tail end of the inner layer pipe extends out of the outer layer pipe;
sequentially sleeving the connecting body into the outer layer pipe, and sleeving the head end of the outer joint into the outer layer pipe until the tail end of the inner layer pipe is exposed;
welding the head end of the inner joint with the tail end of the inner-layer pipe;
welding the head end of the outer joint with the tail end of the outer layer pipe, and welding the tail end of the outer joint with the outer wall of the inner layer pipe;
the connector is pushed until the tail end of the connector is sleeved outside the outer joint.
The embodiment of the present invention further provides a threaded connection double-layer gas pipeline, as shown in fig. 1 to 4, which mainly includes: the pipe joint comprises an inner joint 1, an O-shaped sealing ring 2, an outer joint 3, a connecting body 4, an inner layer pipe 5, an outer layer pipe 6 and an outer connecting piece 7. The inner joint is shown in fig. 2 and comprises an inner hole, a second O-ring groove 12, an inner pipe connecting part 13, an inner pipe welding end surface 14 and an outer joint welding end surface (a first step 15). The inner hole of the inner pipe is the same as the inner diameter of the inner pipe 5, the second O-shaped ring groove 12 is used for placing the O-shaped sealing ring 2, the welding end face 14 of the inner pipe in the inner pipe connecting part 13 (cylindrical boss) is welded with the end face of the inner pipe, and the welding end face of the outer joint is welded with the welding end face 35 of the inner joint in the outer joint 3.
The external joint comprises a first connecting pipe 31, a second connecting pipe 32 and a third connecting pipe 33 as shown in fig. 3, wherein the second connecting pipe 32 is provided with a first O-ring groove 36, a gas collection ring belt, a gas guide hole 34, an internal joint welding end surface 35, an inner hole, a fixed connecting surface 37, a front end spigot 38, a containing hole 39 and a head end surface 310. The first O-shaped ring groove 36 is used for placing the O-shaped sealing ring 2, the diameter of the gas collection ring belt is smaller than the outer diameter of the first O-shaped ring groove 36, the central line of the gas collection ring belt is used as an axis, a plurality of gas guide holes 34 are uniformly distributed on the surface of the gas collection ring belt, the number of the gas guide holes can be 8 or 10, and the specific number is determined according to the outer diameter. The inner joint welding end face 35 is welded with the outer joint welding end face in the inner joint 3, and the diameter of the inner hole is consistent with the inner diameter of the outer layer pipe. The fixed connection surface 37 cooperates with the external connection element 7 to limit the insertion depth thereof. The front end seam allowance 38 of the outer joint 3 and the connector seam allowance 44 in the connector 4 are matched with each other and used for positioning the depth of screwing the outer thread 43 in the connector 4 into the outer connector 7. The receiving bore 39 is slightly larger than the outer diameter of the outer tube 6 so that the outer tube can slide laterally within the receiving bore and the head end face 310 is welded to the outer tube.
The number of the O-shaped sealing rings is 2, the O-shaped sealing rings are placed in the first O-shaped ring groove 36 and the second O-shaped ring groove 12, the outer diameters of the first O-shaped ring groove 36 and the second O-shaped ring groove 12 are matched with the external connecting piece 7, and the O-shaped sealing rings 2 are used for sealing the fuel gas in the inner-layer pipe 5 from leaking to the external environment.
The connector is shown in fig. 4 and comprises an outer hexagon 45, i.e. a sleeved portion 41, a threaded portion 42 provided with an external thread 43, a sleeved portion inner hole, a connector spigot 44 and a cavity forming portion inner hole. The outer hexagon 45 is used for installing and tightly using when the external thread 43 is screwed into the external connecting piece 7, the inner hole of the sleeving part is slightly larger than the outer pipe diameter of the first connecting pipe 31, the connector spigot 44 is matched with the front end spigot 38, the depth of the connector 4 screwed into the external connecting piece 7 is limited, and the screwed-in pretightening force is used for pressing the welded-in inner joint 1, the outer joint 3, the connector 4, the inner layer pipe 5 and the outer layer pipe 6 combined piece on the external connecting piece 7 through the fixed connecting surface 37, so that the whole double-layer gas pipeline is fixedly connected with the external connecting piece 7.
The manufacturing method of the scheme of the invention comprises the following steps:
(1) sleeving the inner layer pipe into the outer layer pipe;
(2) sleeving the connector and the outer joint into the outer layer pipe in sequence;
(3) and pushing the accommodating hole in the outer joint to the end face of the outer pipe, and welding the welding end face of the inner pipe in the inner joint and the end face of the inner pipe together. In the figure 1, a is more than b, so that the inner joint and the inner layer pipe are welded together after the outer joint connecting pipe is pushed into the end face of the outer layer pipe and a sufficient distance is exposed;
(4) welding an inner joint welding end face in the outer joint and an outer joint welding end face in the inner joint together, and then welding a head end face and an outer layer pipe together;
(5) the connector is pushed back to the outer joint along the outer tube.
After the manufacturing is finished, a gas conveying channel can be formed between the inner pipe of the inner pipe and the inner hole of the inner joint in the figure 1, an interlayer can be formed between the inner hole of the outer pipe and the accommodating hole of the outer joint, proper negative pressure is kept in the interlayer, when the inner pipe leaks or the O-shaped sealing ring fails, leaked gas can be driven by the negative pressure, and is guided into the interlayer after passing through the gas collecting ring band and the plurality of uniformly distributed gas guide holes and then is discharged to a safe area through the interlayer.
In conclusion, the embodiment of the invention has simple and effective sealing form, can use flexible pipes or hard pipes as the inner and outer layer pipes, and has strong application adaptability. A gas leakage leading-out space is formed in a narrow space formed by the 2O-shaped sealing rings, and the space utilization rate is high. The leaked fuel gas is led out in the form of the gas collection ring belt and the gas guide holes, and the interlayer space for leading out the fuel gas is not reduced in the length direction, so that the leaked fuel gas is led out quickly. Simple structure, easy processing, and low manufacturing and processing cost.
It should be particularly noted that each component or step in the above embodiments can be intersected, replaced, added or deleted, and therefore, the combination formed by reasonable permutation and combination transformation also belongs to the protection scope of the present invention, and the protection scope of the present invention should not be limited to the above embodiments.
The above is an exemplary embodiment of the present disclosure, and the order of disclosure of the above embodiment of the present disclosure is only for description and does not represent the merits of the embodiment. It should be noted that the discussion of any embodiment above is exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to those examples, and that various changes and modifications may be made without departing from the scope of the disclosure, as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.

Claims (9)

1. A connecting structure for connecting a double-layer gas pipeline with an external interface is characterized by comprising an inner joint, an outer joint and a connector, wherein,
the head end of the inner joint is hermetically connected with the tail end of the inner-layer pipe and is used for communicating the inner-layer pipe to the external interface;
the head end of the outer joint is hermetically connected with the tail end of the outer layer pipe, the tail end of the outer joint is hermetically connected with the outer wall of the inner joint, a first cavity is formed between the inner wall of the outer joint and the outer walls of the inner joint and part of the inner layer pipe, and the outer joint is provided with an air guide hole on the wall forming the first cavity;
the external interface is provided with an external connecting piece, an external connector is inserted into the external connecting piece, and a second cavity is formed at the air guide hole by the inner wall of the external connecting piece and the outer wall of the external connector;
the connecting body is sleeved on the outer layer pipe and is used for being detachably connected with the external connecting piece;
a first sealing ring is arranged on the outer wall of the outer joint, a second sealing ring is arranged on the outer wall of the inner joint, and the second cavity is positioned between the first sealing ring and the second sealing ring;
the inner wall of the external connecting piece is in air-tight sealing connection with the outer wall of the external joint at the first sealing ring;
the inner wall of the outer connector is in air tight connection with the outer wall of the nipple at the second sealing ring.
2. A connection structure for a double-deck gas pipeline to an external interface as claimed in claim 1, wherein the inner joint includes an inner pipe connection part at a head end and an outer joint connection part at a tail end;
the outer diameter of the outer joint connecting portion is larger than that of the inner-layer pipe connecting portion, so that a first step is formed at the joint of the outer joint connecting portion and the inner-layer pipe connecting portion, and the tail end of the outer joint is welded on the first step.
3. The connection structure for connecting a double-layer gas pipeline and an external interface according to claim 1, wherein the external joint comprises a first connecting pipe, a second connecting pipe and a third connecting pipe which are communicated with each other, wherein the inner diameter of the first connecting pipe is not smaller than the outer diameter of the outer pipe, the inner diameters of the second connecting pipe and the third connecting pipe are smaller than the outer diameter of the outer pipe and larger than the outer diameter of the inner pipe, and the head end of the first connecting pipe is welded to the outer pipe;
the air guide holes are arranged on the third connecting pipe in the circumferential direction, and an air collection annular belt is formed on the third connecting pipe;
the end of the third connecting pipe is welded on the outer wall of the nipple.
4. The connection structure for connecting a double-deck gas pipe to an external interface according to claim 1, wherein the connection body comprises a sheathing portion and a threaded portion;
the inner diameter of the sleeving part is not smaller than the outer diameter of the outer pipe and smaller than the outer diameter of the head end of the outer joint;
the inner diameter of the thread part is not smaller than the outer diameter of the head end of the outer joint, and the thread part is provided with an external thread matched with the internal thread of the head end of the external connecting piece.
5. A connection arrangement for a double-deck gas pipeline to an external interface as claimed in claim 1, wherein the external connection member includes an internally threaded portion and a cavity-forming portion in communication, the internally threaded portion being adapted to engage with an external thread on a connection body, the cavity-forming portion being fitted around the outside of the gas-guiding hole.
6. A connection structure for a double-deck gas pipe to an external connection port as claimed in claim 1, wherein the external joint is provided with an annular groove at the air guide hole to form a second cavity with an inner wall of the external connection member.
7. A double-layer gas pipeline, which is characterized by comprising an inner layer pipe, an outer layer pipe and the connecting structure for connecting the double-layer gas pipeline with an external interface according to any one of claims 1 to 6.
8. The dual-layer gas pipeline of claim 7, wherein the first cavity is under-pressurized by an air pump.
9. The method for manufacturing a double-layered gas pipe according to claim 7 or 8, comprising:
sleeving the inner layer pipe into the outer layer pipe, wherein the tail end of the inner layer pipe extends out of the outer layer pipe;
sequentially sleeving the connector into the outer layer pipe, and sleeving the head end of the outer joint into the outer layer pipe until the tail end of the inner layer pipe is exposed;
welding the head end of the inner joint with the tail end of the inner-layer pipe;
welding the head end of the outer joint with the tail end of the outer layer pipe, and welding the tail end of the outer joint with the outer wall of the inner joint;
the connector is pushed until the tail end of the connector is sleeved outside the outer joint.
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