CN112856229B - Jacket pipe for gas pipeline and gas system - Google Patents
Jacket pipe for gas pipeline and gas system Download PDFInfo
- Publication number
- CN112856229B CN112856229B CN202011560823.1A CN202011560823A CN112856229B CN 112856229 B CN112856229 B CN 112856229B CN 202011560823 A CN202011560823 A CN 202011560823A CN 112856229 B CN112856229 B CN 112856229B
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- Prior art keywords
- pipe
- sleeve
- section
- jacket
- elbow
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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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
- F16L25/00—Construction or details of pipe joints not provided for in, or of interest apart from, groups F16L13/00 - F16L23/00
- F16L25/14—Joints for pipes of different diameters or cross-section
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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
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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
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
- F16L41/021—T- or cross-pieces
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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
- F16L43/00—Bends; Siphons
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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
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G9/00—Installations of electric cables or lines in or on the ground or water
- H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Examining Or Testing Airtightness (AREA)
- Pipeline Systems (AREA)
Abstract
The invention provides a jacket pipe for a gas pipeline and a gas system, relates to the technical field of gas conveying pipeline equipment, is suitable for occasions where the gas pipeline needs to be protected by a sleeve, is not limited by the length and the pipe fittings, and is extremely convenient to maintain; the jacket pipe comprises a first straight pipe section, a second straight pipe section, an elbow section, a tee section, a reducing section and a seal detection device, wherein the first straight pipe section, the second straight pipe section, the elbow section, the tee section and the inner pipe of the reducing section are connected to form a jacket pipe inner pipe, the jacket pipe outer pipe is formed by cladding and sealing the sleeves of the first straight pipe section, the second straight pipe section, the elbow section, the tee section and the reducing section, an interlayer cavity for filling protective gas is formed between the jacket pipe inner pipe and the outer pipe, and the seal detection device is used for detecting the tightness of the cavity; the jacket sleeve protects the inner pipe through the outer pipe on one hand, and the outer pipe adopts a cladding and sealing connection mode on the other hand, and the interlayer cavity is filled with micro-positive pressure nitrogen to prevent a closed space containing oxygen from being formed, so that the use length of the jacket sleeve is not limited, and fuel gas is safely transmitted.
Description
Technical Field
The invention relates to the technical field of gas conveying pipeline equipment, in particular to a jacket pipe for a gas pipeline and a gas system.
Background
The condition of taking protective measures is often needed in the construction process of the gas pipeline, and various problems exist in the existing protective measures. For example, the reinforced concrete sleeve is used for protection, and because the reinforced concrete pipe ditch has large field construction workload and heavy weight, occupies larger space, is inconvenient to construct, is easy to damage a gas pipeline during construction, and has larger potential safety hazard; when the sleeve is used for protection, the inner pipeline of the sleeve cannot be provided with a welding seam, the length of the sleeve pipe section is limited, namely, the length of the sleeve pipe cannot exceed the length of one pipeline in protection, when the gas pipeline with the length exceeding the pipeline length needs to be protected, the overhead pipeline needs to be provided with a professional pipeline well, the buried pipeline needs to be provided with a professional pipeline ditch, a large amount of manpower and material resources are consumed, the construction period is slow, and the later maintenance is very inconvenient.
The jacket pipe is used as a pipeline sleeved outside the main pipe, so that the main pipe can be protected from the external environment, the main pipe can be insulated, and the pipeline is prevented from being blocked or broken at low temperature. In the prior art, the jacket pipe can be used in the petrochemical industry in a mode of not limiting the length of the jacket pipe section, but because the jacket pipe needs to run high-temperature and high-pressure steam due to a cavity between the inner pipe and the jacket pipe, the strength of the pipeline is high, the welding process is complex, the installation is inconvenient, and the construction period is longer, so that the jacket pipe cannot be directly applied to the gas industry to protect the gas pipeline. The invention refers to the method for manufacturing the jacket pipe in the design specification of the petrochemical pipeline companion pipe and the jacket pipe, namely SH/T3040-2012, and improves and designs accessories, connection modes, operation modes and the like of the jacket pipe, thereby providing the jacket pipe suitable for the gas industry.
Disclosure of Invention
The invention aims to provide a jacket pipe for a gas pipeline and a gas system, which are suitable for the gas industry, and the jacket pipe with the structure solves the technical problems that a jacket pipe protection structure with more than one pipeline length in the prior art is required to be provided with a professional pipeline well or a pipe ditch, the construction period is long, the manpower and material resources are consumed, and the later maintenance is inconvenient, and the jacket pipe is convenient to use, safe and reliable.
In order to achieve the above purpose, the present invention proposes the following technical scheme: a jacket pipe for a gas pipeline comprises a first straight pipe section, a second straight pipe section, an elbow section for connecting the two first straight pipe sections, a three-way section and a reducing section which are arranged on the first straight pipe section, and a sealing detection device;
the first straight pipe section comprises a first inner pipe, a first sleeve sleeved on the outer side of the first inner pipe and a plurality of first positioning plates, and the two axial ends of the first inner pipe are respectively protruded out of the two axial ends of the first sleeve; a plurality of first through holes are uniformly formed in the surface of the first positioning plate, the first positioning plates are uniformly sleeved on the outer wall of the first inner pipe at intervals, the inner diameter of the first positioning plate is adapted to the outer diameter of the first inner pipe, and the outer diameter of the first positioning plate is adapted to the inner diameter of the first sleeve;
the second straight pipe section comprises a second inner pipe, a second sleeve sleeved on the outer side of the second inner pipe and a plurality of second positioning plates, and the two axial ends of the second inner pipe are respectively protruded out of the two axial ends of the second sleeve; a plurality of second through holes are uniformly formed in the surface of the second positioning plate, the second positioning plates are uniformly sleeved on the outer wall of the second inner pipe at intervals, the inner diameter of the second positioning plate is adapted to the outer diameter of the second inner pipe, and the outer diameter of the second positioning plate is adapted to the inner diameter of the second sleeve;
the elbow section comprises an elbow inner pipe and an elbow sleeve sleeved outside the elbow inner pipe, two ends of the elbow inner pipe are respectively connected to the first inner pipe ends of the two sections of first straight pipe sections, and the pipe diameter of the elbow inner pipe is equal to that of the first inner pipe; the end part of the elbow sleeve is sleeved outside the elbow inner pipe, the end parts of the two ends of the elbow sleeve respectively extend to one side end part of a first sleeve of the two sections of first straight pipe sections, the end part of the elbow sleeve is coated on the outer wall of the first sleeve, and a first sealing layer is arranged between the end part of the elbow sleeve and the coating position of the outer wall of the first sleeve;
the three-way section comprises a three-way inner pipe and a three-way sleeve sleeved outside the three-way inner pipe, three-end openings of the three-way inner pipe are respectively connected to one side end part of a first inner pipe of the three-section first straight pipe section, the three-way sleeve is sleeved outside the three-way inner pipe, three-end openings of the three-way sleeve respectively extend to one side end part of a first sleeve of the three-section first straight pipe section, the end part of the three-way sleeve is partially coated on the outer wall of the first sleeve, and a second sealing layer is arranged between the end part of the three-way sleeve and the coating position of the outer wall of the first sleeve;
the reducing section is used for connecting the first straight pipe section and the second straight pipe section and comprises a reducing inner pipe and a reducing sleeve sleeved outside the reducing inner pipe; the reducing sleeve comprises a first section of sleeve matched with the pipe diameter of the first sleeve, a second section of sleeve matched with the pipe diameter of the second sleeve and a third section of sleeve used for connecting the first section of sleeve and the second section of sleeve, the first section of sleeve extends to one side end part of the first sleeve, the end part of the first section of sleeve is coated on the outer wall of the first sleeve, and a third sealing layer is arranged between the end part of the first section of sleeve and the coating position of the outer wall of the first sleeve; the second section sleeve extends to one side end part of the second sleeve, the end part of the second section sleeve is coated on the outer wall of the second sleeve, and a fourth sealing layer is arranged between the end part of the second section sleeve and the coating position of the outer wall of the second sleeve; the reducing inner tube is adapted to the third section of sleeve, and two ends of the reducing inner tube are respectively connected with the first inner tube and the second inner tube;
the first inner pipe, the second inner pipe, the elbow inner pipe, the three-way inner pipe and the reducing inner pipe form a jacket pipe inner pipe, the first sleeve, the second sleeve, the elbow sleeve, the three-way sleeve and the reducing sleeve form a jacket pipe outer pipe, an interlayer cavity is formed between the jacket pipe inner pipe and the jacket pipe outer pipe, and positive pressure inert gas is filled in the interlayer cavity;
the sealing detection device is arranged on the clamping sleeve and used for detecting the tightness of the interlayer cavity.
Further, the elbow sleeve, the tee sleeve and the reducing sleeve are all arranged into a cylindrical structure formed by splicing two semicircular cylinders; the two sides of the opening of the semi-cylinder are respectively provided with a rib plate extending outwards along the radial direction of the semi-cylinder, and the rib plates are fixedly connected when the two semi-cylinders are spliced.
Further, the length of any end of the first inner tube in the axial direction protruding out of the end part of the first sleeve is not smaller than the pipe diameter of the first inner tube, and the length of any end of the second inner tube in the axial direction protruding out of the end part of the second sleeve is not smaller than the pipe diameter of the second inner tube;
defining the pipe diameter of the first inner pipe in the first straight pipe section as D1, the pipe diameter of the second inner pipe in the second straight pipe section as D2, the distance between the first locating plate adjacent to the first sleeve end in the first straight pipe section and the first sleeve end as D3, the distance between the second locating plate adjacent to the second sleeve end in the second straight pipe section and the second sleeve end as D4, d3= 0.5D1, and d4= 0.5D2.
Further, two ends of the jacket pipe along the length direction of the jacket pipe are respectively provided with a plug, and the plugs are used for sealing the interlayer cavity; the plugging device is provided with a step structure which is formed by coaxially arranging two sections of reducing cylinders;
the small-diameter cylinder and the large-diameter cylinder of the step structure are defined as a first cylinder and a second cylinder respectively, the first cylinder is sealed and sleeved on the outer wall of the inner tube of the jacket tube, and the second cylinder is sealed and sleeved on the outer wall of the outer tube of the jacket tube.
Furthermore, the inner tube of the jacket tube and the outer tube of the jacket tube are made of steel;
or the inner pipe of the jacket pipe is made of steel, and the outer pipe of the jacket pipe is made of PE or PVC;
or the inner pipe of the jacket pipe is made of PE, and the outer pipe of the jacket pipe is made of PE or PVC;
or the inner tube of the jacket tube is made of PE, and the outer tube of the jacket tube is made of steel.
Further, when the material of the inner tube of the jacket tube is steel, welding the first inner tube, the elbow inner tube, the three-way inner tube, the reducing inner tube and the second inner tube;
when the inner tube of the jacket tube is made of PE, the first inner tube, the elbow inner tube, the three-way inner tube, the reducing inner tube and the second inner tube are connected in a hot melting mode or welded in an electric melting mode.
Further, the outer diameter of the jacket pipe inner pipe of the plugging installation end on the jacket pipe is defined as D5, the outer diameter of the jacket pipe outer pipe is defined as D6, the axial matching length of the first cylinder and the outer wall of the jacket pipe inner pipe is not more than D5-30mm, and the axial matching length of the second cylinder and the outer wall of the jacket pipe outer pipe is not less than D6.
Further, the sealing detection device comprises a sealing detection pipeline communicated with the interlayer cavity from the outer wall of the outer tube of the jacket tube, a ball valve arranged on the sealing detection pipeline and a pressure gauge arranged on the side of the ball valve far away from the jacket tube; the ball valve is in a normally closed state.
Furthermore, the axial matching lengths of the elbow sleeve, the tee sleeve and the outer wall of the first sleeve are not smaller than the outer diameter of the first inner tube.
The invention also discloses a gas system which comprises the jacket pipe for the gas pipeline.
According to the technical scheme, the jacket pipe for the gas pipeline and the gas system provided by the technical scheme of the invention have the following beneficial effects:
the jacket pipe for the gas pipeline and the gas system are suitable for gas transportation, and the jacket pipe is long in pipeline and convenient to maintain; the jacket pipe comprises a first straight pipe section, a second straight pipe section, an elbow section, a tee section, a reducing section and a sealing detection device, wherein the inner pipes of the first straight pipe section, the second straight pipe section, the elbow section, the tee section and the reducing section are connected to form a jacket pipe inner pipe, the jacket pipe outer pipe is formed by cladding and sealing the sleeves of the first straight pipe section, the second straight pipe section, the elbow section, the tee section and the reducing section, an interlayer cavity for filling protective gas is formed between the jacket pipe inner pipe and the outer pipe, the formation of a closed space with oxygen is prevented, and the sealing detection device is used for detecting the tightness of the cavity. The jacket pipe disclosed by the invention has the advantages that the outer pipe is adopted to protect the inner pipe and prevent the outer environment from damaging the inner pipe, and on the other hand, the outer pipe adopts a cladding and sealing connection mode, so that the tightness of the interlayer cavity can be detected in real time through the sealing detection device, and the tightness and the safety of the inner pipe are ensured.
In addition, the outer tube of the jacket tube can not limit the connection mode of the inner tube of the jacket tube and the installation length of the jacket tube, so the jacket tube can be applied to different fuel gas conveying structures and is more convenient to install and maintain; meanwhile, the interlayer cavity of the jacket sleeve is filled with the protective gas, so that the jacket sleeve can be prevented from forming an oxygen-containing closed space, and the safety of gas transmission is prevented from being influenced.
The invention provides a jacket sleeve, wherein the inner pipe/outer pipe of the jacket sleeve can be made of steel or PE, and the jacket sleeve is suitable for different arrangement positions and scenes, for example, the inner pipe/outer pipe is made of steel and can be suitable for the situations of safe spacing or insufficient burial depth of overhead and buried steel pipelines, the inner pipe is made of PE, the outer pipe is made of steel, the inner pipe is made of PE, and the outer pipe is made of PE or PVC and is suitable for the situations of safe spacing or insufficient burial depth of buried PE pipelines and electric power pipelines.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a longitudinal schematic view of a jacket sleeve of the present invention;
FIG. 2 is a schematic longitudinal cut of a first straight tube section of the jacketed pipe;
FIG. 3 is a schematic longitudinal cut view of a jacket tube elbow segment connected to a first straight tube segment;
FIG. 4 is a schematic longitudinal cut view of a three-way section of a jacketed pipe connected to a first straight pipe section;
FIG. 5 is a schematic longitudinal cutting view of the connection of the jacket pipe reducing section with the first straight pipe section and the second straight pipe section;
FIG. 6 is a schematic diagram of a jacket tube seal detection device;
fig. 7 is a schematic view of a first positioning plate.
In the figure, the specific meaning of each mark is as follows:
1-first straight pipe section, 1.1-first inner pipe, 1.2-first sleeve, 1.3-first positioning plate, 2-second straight pipe section, 2.1-second inner pipe, 2.2-second sleeve, 2.3-second positioning plate, 3-elbow section, 3.1-elbow inner pipe, 3.2-elbow sleeve, 3.3-elbow rib plate, 4-tee section, 4.1-tee inner pipe, 4.2-tee sleeve, 4.3-tee rib plate, 5-reducing section, 5.1-reducing inner pipe, 5.2-reducing sleeve, 5.3-reducing rib plate, 6-seal detection device, 6.1-seal detection pipeline, 6.2-ball valve, 6.3-pressure gauge, 7-shutoff, 8-gas equipment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Also, unless the context clearly indicates otherwise, singular forms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "comprises," "comprising," or the like are intended to cover a feature, integer, step, operation, element, and/or component recited as being present in the element or article that "comprises" or "comprising" does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "up", "down", "left", "right" and the like are used only to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.
The protection device for the gas conveying pipeline based on the prior art comprises a specially excavated pipeline well, a specially excavated pipe trench and a specially constructed pipe clamping pipe, wherein the pipeline well and the specially constructed pipe trench are constructed by special personnel, and the protection device consumes manpower and material resources, has long construction period and is inconvenient to maintain; the jacket pipe is convenient to use, but the length of the sleeved pipe section is limited because the inner pipe cannot be provided with a welding line, and the length of one pipeline can be protected, so that the jacket pipe is narrow in practical application. The invention aims to provide a jacket pipe for a gas pipeline and a gas system, which can be specially used for gas transportation, do not limit the application length of the jacket pipe, and are convenient to use and maintain.
The jacket pipe for a gas pipe and the gas system according to the present invention will be described in detail with reference to the embodiments shown in the drawings.
Referring to fig. 1 and 7, the jacket pipe for a gas pipeline disclosed by the invention comprises a first straight pipe section 1, a second straight pipe section 2, an elbow section 3 for connecting the two first straight pipe sections 1, a three-way section 4 arranged on the first straight pipe section 1, a reducing section 5 and a seal detection device 6; the first straight pipe section 1 comprises a first inner pipe 1.1, a first sleeve pipe 1.2 sleeved on the outer side of the first inner pipe 1.1 and a plurality of first positioning plates 1.3, wherein the two axial ends of the first inner pipe 1.1 are respectively protruded out of the two axial ends of the first sleeve pipe 1.2; a plurality of first through holes are uniformly formed in the surface of the first positioning plate 1.3, the first positioning plate 1.3 is uniformly sleeved on the outer wall of the first inner tube 1.1 at intervals, the inner diameter of the first positioning plate 1.3 is adapted to the outer diameter of the first inner tube 1.1, and the outer diameter of the first positioning plate 1.3 is adapted to the inner diameter of the first sleeve 1.2. The second straight pipe section 2 comprises a second inner pipe 2.1, a second sleeve pipe 2.2 sleeved outside the second inner pipe 2.1 and a plurality of second positioning plates 2.3, and two axial ends of the second inner pipe 2.1 are respectively protruded out of two axial ends of the second sleeve pipe 2.2; a plurality of second through holes are uniformly formed in the surface of the second positioning plate 2.3, the second positioning plate 2.3 is uniformly sleeved on the outer wall of the second inner tube 2.1 at intervals, the inner diameter of the second positioning plate 2.3 is adapted to the outer diameter of the second inner tube 2.1, and the outer diameter of the second positioning plate 2.3 is adapted to the inner diameter of the second sleeve 2.2.
With reference to the specific embodiment shown in fig. 2, the length of any axial end of the first inner tube 1.1 protruding from the end of the first sleeve 1.2 is not smaller than the tube diameter of the first inner tube 1.1, and the length of any axial end of the second inner tube 2.1 protruding from the end of the second sleeve 2.2 is not smaller than the tube diameter of the second inner tube 2.1; defining the pipe diameter of the first inner pipe 1.1 in the first straight pipe section 1 as D1, the pipe diameter of the second inner pipe 2.1 in the second straight pipe section 2 as D2, the distance between the first positioning plate 1.3 adjacent to the end of the first sleeve 1.2 in the first straight pipe section 1 and the end of the first sleeve 1.2 as D3, and the distance between the second positioning plate 2.3 adjacent to the end of the second sleeve 2.2 in the second straight pipe section 2 and the end of the second sleeve 2.2 as D4, in order to ensure the supporting effect of the first positioning plate 1.3 or the second positioning plate 2.3, d3= 0.5D1, d4= 0.5D2.
Referring to fig. 3, the elbow section 3 includes an elbow inner pipe 3.1 and an elbow sleeve 3.2 sleeved outside the elbow inner pipe 3.1, wherein two ends of the elbow inner pipe 3.1 are respectively connected to the ends of a first inner pipe 1.1 of two sections of first straight pipe sections 1, and the pipe diameter of the elbow inner pipe 3.1 is equal to that of the first inner pipe 1.1; the end part of the elbow sleeve 3.2 is sleeved outside the elbow inner pipe 3.1, the end parts of the two ends of the elbow sleeve 3.2 respectively extend to one side end part of the first sleeve 1.2 of the two sections of first straight pipe sections 2, the end part of the elbow sleeve 3.2 is coated on the outer wall of the first sleeve 1.2, and a first sealing layer is arranged between the end part of the elbow sleeve 3.2 and the coating position of the outer wall of the first sleeve 1.2.
Referring to fig. 4, the three-way section 4 includes a three-way inner pipe 4.1 and a three-way sleeve 4.2 sleeved outside the three-way inner pipe 4.1, three-way openings of the three-way inner pipe 4.1 are respectively connected to one side end of a first inner pipe 1.1 of the three-way first straight pipe section 1, the three-way sleeve 4.2 is sleeved outside the three-way inner pipe 4.1, three-way openings of the three-way sleeve 4.2 are respectively extended to one side end of a first sleeve 1.2 of the three-way first straight pipe section 1, an end portion of the three-way sleeve 4.2 is coated on the outer wall of the first sleeve 1.2, and a second sealing layer is arranged between the end portion of the three-way sleeve 4.2 and the coating position of the outer wall of the first sleeve 1.2.
In the specific implementation process, the three-end opening of the three-way section 4 can customize different pipe diameters according to the requirements of implementation scenes, and is adaptive to connect straight pipe sections with different pipe diameters. As in the embodiment shown in fig. 4, the diameters of the openings at the two ends of the uniform straight line are the same, and the diameter of the third port perpendicular to the straight line is smaller.
Referring to fig. 5, the reducing section 5 is used for connecting the first straight pipe section 1 and the second straight pipe section 2, and comprises a reducing inner pipe 5.1 and a reducing sleeve 5.2 sleeved outside the reducing inner pipe 5.1, wherein the reducing sleeve 5.2 comprises a first section of sleeve matched with the pipe diameter of the first sleeve 1.2, a second section of sleeve matched with the pipe diameter of the second sleeve 2.2 and a third section of sleeve used for connecting the first section of sleeve and the second section of sleeve, the first section of sleeve extends to one side end part of the first sleeve 1.2, the end part of the first section of sleeve is partially coated on the outer wall of the first sleeve 1.2, and a third sealing layer is arranged between the end part of the first section of sleeve and the coating position of the outer wall of the first sleeve 1.2; the second section sleeve extends to one side end part of the second sleeve 2.2, the end part of the second section sleeve is coated on the outer wall of the second sleeve 2.2, and a fourth sealing layer is arranged between the end part of the second section sleeve and the coating position of the outer wall of the second sleeve 2.2; the reducing inner tube 5.1 is adapted to the third section of sleeve, and two ends of the reducing inner tube 5.1 are respectively connected with the first inner tube 1.1 and the second inner tube 1.2. As shown in fig. 5, the reducing inner tube 5.1 and the third section of sleeve are both provided with round tables with two open ends.
The first inner pipe 1.1, the second inner pipe 2.1, the elbow inner pipe 3.1, the tee inner pipe 4.1 and the reducing inner pipe 5.1 form a jacket pipe inner pipe, the first sleeve pipe 1.2, the second sleeve pipe 2.2, the elbow sleeve pipe 3.2, the tee sleeve pipe 4.2 and the reducing sleeve pipe 5.2 form a jacket pipe outer pipe, a sandwich cavity is formed between the jacket pipe inner pipe and the jacket pipe outer pipe, and positive pressure inert gas is filled in the sandwich cavity; when the device is used in a specific implementation mode, the interlayer cavity is filled with nitrogen, and the nitrogen is filled until the interlayer cavity is in a micro-positive pressure state, so that an oxygen-containing closed space does not exist in the interlayer cavity.
In the above embodiment, in order to ensure the stability of the cladding connection between the outer tubes of the jacket tubes, the axial matching lengths of the elbow sleeve 3.2, the tee sleeve 4.2 and the outer wall of the first sleeve 1.2 are not smaller than the outer diameter of the first inner tube 1.1. Similarly, the axial matching length of the reducing sleeve 5.2 and the outer wall of the first sleeve 1.2 is not smaller than the outer diameter of the first inner tube 1.1, and the axial matching length of the reducing sleeve 5.2 and the outer wall of the second sleeve 2.2 is not smaller than the outer diameter of the second inner tube 2.1.
In fig. 1, a seal detection device 6 is arranged on the jacket tube for detecting the tightness of the jacket cavity. Fig. 6 shows a structure of the seal detecting device 6, which comprises a seal detecting pipeline 6.1 communicated with a sandwich cavity from the outer wall of an outer tube of a jacket tube, a ball valve 6.2 arranged on the seal detecting pipeline 6.1, and a pressure gauge 6.3 arranged on the side of the ball valve 6.2 away from the jacket tube, wherein the ball valve 6.2 is in a normally closed state; when the sealing effect of the inner pipe of the sleeve is required to be judged through pressure measurement, the ball valve 6.2 can be adjusted to be in a normally open state, and the internal pressure of the current interlayer cavity is displayed through the pressure gauge 6.3; for example, if the pressure gauge 6.3 value maintains the positive pressure value of the initial inert gas charge, the sleeve is safe and does not leak; if the value of the pressure gauge 6.3 is unchanged, the pressure gauge is identical with the external atmospheric pressure, and the outer tube of the jacket pipe leaks; if the value of the pressure gauge 6.3 is equal to the pressure of the fuel gas, the leakage of the inner pipe of the jacket pipe is indicated.
In the coating structure in the embodiment shown in fig. 2 to 5, the first sealing layer, the second sealing layer, the third sealing layer and the fourth sealing layer all directly adopt a tetrafluoro gasket as the sealing layer, and the thickness of the tetrafluoro gasket is 2.5mm.
In order to ensure the stability of the interconnection between the outer tubes of the jacket tubes, in the embodiment shown in fig. 3 to 5, the elbow sleeve 3.2, the tee sleeve 4.2 and the reducing sleeve 5.2 are all arranged into a cylindrical structure formed by splicing two semicircular cylinders, and the two sides of the opening of the semicircular cylinder are respectively provided with rib plates extending outwards along the radial direction of the opening, such as the elbow rib plate 3.3, the tee rib plate 4.3 and the reducing rib plate 5.3, which are fixedly connected when the two semicircular cylinders are spliced to form a sealing and fixing structure of the clamp-like. In order to ensure the sealing effect between the two corresponding spliced semicircular cylinder rib plates, a sealing gasket is arranged between the matched connection parts. The first sleeve 1.2 and the second sleeve 2.2 are positioned on the straight pipe section, so that finished pipelines with larger diameters compared with the inner pipelines can be directly selected.
The jacket pipe shown in fig. 1 is provided with plugs 7 at two ends in the length direction, and the plugs 7 are used for sealing the interlayer cavity; as shown in fig. 6, the plug 7 is provided as a step structure coaxially arranged by two sections of reducing cylinders; defining a small-diameter cylinder as a first cylinder and a large-diameter cylinder as a second cylinder in the step structure, wherein the first cylinder is sealed and sleeved on the outer wall of the inner tube of the jacket tube, and the second cylinder is sealed and sleeved on the outer wall of the outer tube of the jacket tube; the sealing structure for realizing the sealing sleeve can be a tetrafluoro gasket. In addition, in order to ensure the stable effect of plugging installation, the outer diameter of the jacket pipe inner pipe at the plugging 7 installation end on the jacket pipe is defined as D5, the outer diameter of the jacket pipe outer pipe is defined as D6, the axial matching length of the first cylinder and the outer wall of the jacket pipe inner pipe is not more than D5-30mm, the axial matching length of the second cylinder and the outer wall of the jacket pipe outer pipe is not less than D6, and the end part of the jacket pipe inner pipe is reserved with a length of 30mm which is not matched for welding when the working equipment is conveniently installed. It should be noted that the tetrafluoro gasket is only one sealing structure of the present invention, and the sealing layer or sealing structure provided by the present invention is not limited to sealing gaskets made of other materials or other methods for achieving sealing.
The jacket sleeve disclosed by the invention is a series of jacket sleeves with the structure, is not limited to the structure, and also comprises inner and outer pipe materials, namely, the application scene of the jacket sleeve when the inner and outer pipe materials of the jacket sleeve are different is pointed out.
In some embodiments, the inner tube of the jacket tube and the outer tube of the jacket tube are made of steel, and at the moment, the first inner tube 1.1, the elbow inner tube 3.1, the three-way inner tube 4.1, the reducing inner tube 5.1 and the second inner tube 2.1 which form the inner tube of the jacket tube are welded; the all-steel clamping sleeve is applicable to the application scene of insufficient safety distance or burial depth of buried steel pipelines when gas is conveyed; when the inner pipe of the jacket pipe is made of PE, the outer pipe of the jacket pipe is made of PE or PVC and other insulating materials, the first inner pipe 1.1, the elbow inner pipe 3.1, the three-way inner pipe 4.1, the reducing inner pipe 5.1 and the second inner pipe 2.1 which form the inner pipe of the jacket pipe are connected in a hot melting way or welded in an electric melting way; the full insulating material jacket pipe is only suitable for the application scene of the safe spacing between the buried PE pipeline and the electric power pipeline when the fuel gas is conveyed; the inner tube of the jacket tube is made of steel, the outer tube of the jacket tube is made of insulating materials such as PE or PVC, the inner tubes of the jacket tube are welded, and the jacket tube is suitable for being used when the safety distance between the jacket tube and the power pipeline is insufficient. When the sleeve is made of PE or other materials unsuitable for overhead, the sleeve cannot be used for overhead. The inner pipe of the jacket pipe is made of PE, the outer pipe of the jacket pipe is made of steel, the inner pipes of the jacket pipe are connected in a fusion mode or welded in an electric fusion mode, and the jacket pipe is only suitable for application scenes of short safety distance or insufficient burial depth of buried PE pipelines during gas transportation.
The invention also provides a gas system, which adopts the jacket pipe for the gas pipeline to carry gas, can select different types of jacket pipes according to the requirements of application scenes when the pipeline is erected, is convenient to construct and maintain in later-period overhaul, can be used for a long distance, and is safe and reliable when the gas is conveyed.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (7)
1. The jacket pipe for the gas pipeline is characterized by comprising a first straight pipe section, a second straight pipe section, an elbow section for connecting the two first straight pipe sections, a three-way section arranged on the first straight pipe section, a reducing section and a seal detection device;
the first straight pipe section comprises a first inner pipe, a first sleeve sleeved on the outer side of the first inner pipe and a plurality of first positioning plates, and the two axial ends of the first inner pipe are respectively protruded out of the two axial ends of the first sleeve; a plurality of first through holes are uniformly formed in the surface of the first positioning plate, the first positioning plates are uniformly sleeved on the outer wall of the first inner pipe at intervals, the inner diameter of the first positioning plate is adapted to the outer diameter of the first inner pipe, and the outer diameter of the first positioning plate is adapted to the inner diameter of the first sleeve;
the second straight pipe section comprises a second inner pipe, a second sleeve sleeved on the outer side of the second inner pipe and a plurality of second positioning plates, and the two axial ends of the second inner pipe are respectively protruded out of the two axial ends of the second sleeve; a plurality of second through holes are uniformly formed in the surface of the second positioning plate, the second positioning plates are uniformly sleeved on the outer wall of the second inner pipe at intervals, the inner diameter of the second positioning plate is adapted to the outer diameter of the second inner pipe, and the outer diameter of the second positioning plate is adapted to the inner diameter of the second sleeve;
the elbow section comprises an elbow inner pipe and an elbow sleeve sleeved outside the elbow inner pipe, two ends of the elbow inner pipe are respectively connected to the first inner pipe ends of the two sections of first straight pipe sections, and the pipe diameter of the elbow inner pipe is equal to that of the first inner pipe; the end part of the elbow sleeve is sleeved outside the elbow inner pipe, the end parts of the two ends of the elbow sleeve respectively extend to one side end part of a first sleeve of the two sections of first straight pipe sections, the end part of the elbow sleeve is coated on the outer wall of the first sleeve, and a first sealing layer is arranged between the end part of the elbow sleeve and the coating position of the outer wall of the first sleeve;
the three-way section comprises a three-way inner pipe and a three-way sleeve sleeved outside the three-way inner pipe, three-end openings of the three-way inner pipe are respectively connected to one side end part of a first inner pipe of the three-section first straight pipe section, the three-way sleeve is sleeved outside the three-way inner pipe, three-end openings of the three-way sleeve respectively extend to one side end part of a first sleeve of the three-section first straight pipe section, the end part of the three-way sleeve is partially coated on the outer wall of the first sleeve, and a second sealing layer is arranged between the end part of the three-way sleeve and the coating position of the outer wall of the first sleeve;
the reducing section is used for connecting the first straight pipe section and the second straight pipe section and comprises a reducing inner pipe and a reducing sleeve sleeved outside the reducing inner pipe; the reducing sleeve comprises a first section of sleeve matched with the pipe diameter of the first sleeve, a second section of sleeve matched with the pipe diameter of the second sleeve and a third section of sleeve used for connecting the first section of sleeve and the second section of sleeve, the first section of sleeve extends to one side end part of the first sleeve, the end part of the first section of sleeve is coated on the outer wall of the first sleeve, and a third sealing layer is arranged between the end part of the first section of sleeve and the coating position of the outer wall of the first sleeve; the second section sleeve extends to one side end part of the second sleeve, the end part of the second section sleeve is coated on the outer wall of the second sleeve, and a fourth sealing layer is arranged between the end part of the second section sleeve and the coating position of the outer wall of the second sleeve; the reducing inner tube is adapted to the third section of sleeve, and two ends of the reducing inner tube are respectively connected with the first inner tube and the second inner tube;
the first inner pipe, the second inner pipe, the elbow inner pipe, the three-way inner pipe and the reducing inner pipe form a jacket pipe inner pipe, the first sleeve, the second sleeve, the elbow sleeve, the three-way sleeve and the reducing sleeve form a jacket pipe outer pipe, an interlayer cavity is formed between the jacket pipe inner pipe and the jacket pipe outer pipe, and positive pressure inert gas is filled in the interlayer cavity;
the sealing detection device is arranged on the clamping sleeve and is used for detecting the tightness of the interlayer cavity;
the length of any end of the first inner tube in the axial direction protruding out of the end part of the first sleeve is not smaller than the pipe diameter of the first inner tube, and the length of any end of the second inner tube in the axial direction protruding out of the end part of the second sleeve is not smaller than the pipe diameter of the second inner tube;
defining the pipe diameter of a first inner pipe in a first straight pipe section as D1, the pipe diameter of a second inner pipe in a second straight pipe section as D2, the distance between a first positioning plate adjacent to the end of a first sleeve in the first straight pipe section and the end of the first sleeve as D3, and the distance between a second positioning plate adjacent to the end of a second sleeve in the second straight pipe section and the end of the second sleeve as D4, wherein d3= 0.5D1 and d4= 0.5D2;
the two ends of the jacket pipe along the length direction are respectively provided with a plug, and the plugs are used for sealing the interlayer cavity;
the plugging is in a step structure formed by coaxially arranging two sections of reducing cylinders;
defining a small-diameter cylinder as a first cylinder and a large-diameter cylinder as a second cylinder in the step structure, wherein the first cylinder is sealed and sleeved on the outer wall of the inner tube of the jacket tube, and the second cylinder is sealed and sleeved on the outer wall of the outer tube of the jacket tube;
and defining that the outer diameter of the jacket pipe inner pipe of the plugging installation end on the jacket pipe is D5, and the outer diameter of the jacket pipe outer pipe is D6, so that the axial matching length of the first cylinder and the jacket pipe inner pipe outer wall is not more than D5-30mm, and the axial matching length of the second cylinder and the jacket pipe outer wall is not less than D6.
2. The jacket sleeve for a gas pipeline according to claim 1, wherein the elbow sleeve, the three-way sleeve and the reducing sleeve are all arranged into a cylindrical structure formed by splicing two semi-cylinders; the two sides of the opening of the semi-cylinder are respectively provided with a rib plate extending outwards along the radial direction of the semi-cylinder, and the rib plates are fixedly connected when the two semi-cylinders are spliced.
3. The jacket sleeve for a gas pipeline according to claim 1, wherein the inner jacket sleeve pipe and the outer jacket sleeve pipe are made of steel;
or the inner pipe of the jacket pipe is made of steel, and the outer pipe of the jacket pipe is made of PE or PVC;
or the inner pipe of the jacket pipe is made of PE, and the outer pipe of the jacket pipe is made of steel;
or the inner tube of the jacket tube is made of PE, and the outer tube of the jacket tube is made of PE or PVC.
4. The jacket sleeve for a gas pipeline according to claim 3, wherein when the material of the inner tube of the jacket sleeve is steel, the first inner tube, the elbow inner tube, the three-way inner tube, the reducing inner tube and the second inner tube are welded;
when the inner tube of the jacket tube is made of PE, the first inner tube, the elbow inner tube, the three-way inner tube, the reducing inner tube and the second inner tube are connected in a hot melting mode or welded in an electric melting mode.
5. The jacket sleeve for a gas pipeline according to claim 1, wherein the seal detection device comprises a seal detection pipeline communicated with the interlayer cavity from the outer wall of the jacket sleeve outer pipe, a ball valve arranged on the seal detection pipeline and a pressure gauge arranged on the side of the ball valve away from the jacket sleeve; the ball valve is in a normally closed state.
6. The jacketed pipe for a gas pipeline according to claim 1, wherein the fitting lengths of the elbow sleeve, the tee sleeve and the outer wall of the first sleeve in the axial direction are not smaller than the outer diameter of the first inner pipe.
7. A gas system comprising a jacketed pipe for a gas pipeline as set forth in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011560823.1A CN112856229B (en) | 2020-12-25 | 2020-12-25 | Jacket pipe for gas pipeline and gas system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011560823.1A CN112856229B (en) | 2020-12-25 | 2020-12-25 | Jacket pipe for gas pipeline and gas system |
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| CN112856229A CN112856229A (en) | 2021-05-28 |
| CN112856229B true CN112856229B (en) | 2024-04-09 |
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| CN202011560823.1A Active CN112856229B (en) | 2020-12-25 | 2020-12-25 | Jacket pipe for gas pipeline and gas system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113483271B (en) * | 2021-07-19 | 2025-01-03 | 长春工程学院 | A refrigeration cycle piping system, control method and application |
| CN115596918B (en) * | 2022-10-08 | 2025-12-16 | 合肥瑞纳智能能源管理有限公司 | Pipeline joint repairing device, repairing method and pipeline system |
| CN116877933B (en) * | 2023-07-25 | 2024-01-19 | 武汉市燃气集团有限公司 | Gas pipe network fault information monitoring and early warning system and method |
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| US6032699A (en) * | 1997-05-19 | 2000-03-07 | Furon Company | Fluid delivery pipe with leak detection |
| CN102758973A (en) * | 2012-07-17 | 2012-10-31 | 东北石油大学 | Dual-layer pipe wall composite-type gas pipeline and leakage monitoring method |
| CN106195467A (en) * | 2016-08-12 | 2016-12-07 | 招商局重工（江苏）有限公司 | A kind of simple, monoblock type double-wall pipe |
| CN210716349U (en) * | 2019-07-15 | 2020-06-09 | 亚达管道系统股份有限公司 | Inflatable positive pressure inerting gas double-wall pipe |
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2020
- 2020-12-25 CN CN202011560823.1A patent/CN112856229B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6032699A (en) * | 1997-05-19 | 2000-03-07 | Furon Company | Fluid delivery pipe with leak detection |
| CN102758973A (en) * | 2012-07-17 | 2012-10-31 | 东北石油大学 | Dual-layer pipe wall composite-type gas pipeline and leakage monitoring method |
| CN106195467A (en) * | 2016-08-12 | 2016-12-07 | 招商局重工（江苏）有限公司 | A kind of simple, monoblock type double-wall pipe |
| CN210716349U (en) * | 2019-07-15 | 2020-06-09 | 亚达管道系统股份有限公司 | Inflatable positive pressure inerting gas double-wall pipe |
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