CN104930270A - Prefabricated pipe fitting for fuel gas and manufacturing method of prefabricated pipe fitting - Google Patents
Prefabricated pipe fitting for fuel gas and manufacturing method of prefabricated pipe fitting Download PDFInfo
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- CN104930270A CN104930270A CN201510387978.2A CN201510387978A CN104930270A CN 104930270 A CN104930270 A CN 104930270A CN 201510387978 A CN201510387978 A CN 201510387978A CN 104930270 A CN104930270 A CN 104930270A
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- pipe
- pipe fitting
- combustion gas
- foaming layer
- prefabricated pipe
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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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Thermal Insulation (AREA)
Abstract
The invention discloses a prefabricated pipe fitting for fuel gas. The prefabricated pipe fitting is mainly used as a pipe of a perpendicular section and comprises an outer pipe, an inner pipe and a foaming layer. The part between the outer pipe and the inner pipe is filled with the foaming layer. The inner pipe comprises a steel pipe lengthened steel plastic converting part and a polyethylene pipe which are communicated through a connecting pipe. The outer pipe is a pipe, equivalently, the prefabricated pipe fitting for fuel gas is only used as a pipe fitting, and the risk of gas leakage is lowered to the maximum degree; in addition, the thermal capacity of soil on the ground and common protection of the thermal resistance of the soil and the thermal resistance of the foaming layer are utilized, and the problem that water vapor is prone to being frozen is solved; furthermore, due to the fact that the polyethylene pipe is used as an outer sleeve, the features that a polyethylene surface is smooth and does not have hydrophilic groups are utilized, the problem that the pipe fitting is pulled and damaged when frozen soil is subjected to frost heaving, and the normal use of the pipe fitting is ensured. The invention further discloses a manufacturing method of the prefabricated pipe fitting for fuel gas.
Description
Technical field
The present invention relates to fuel tube technical field, particularly a kind of combustion gas prefabricated pipe fitting and preparation method thereof.
Background technique
Gas service pipe is defined as, specify according in " Code for design of city gas engineering " GB50028-2006, (service pipe) outdoor distribution arm and indoor fuel gas inlet tube total valve are (when without total valve, batch flooring 1m eminence) between pipeline, the gas pipeline supply of resident, the inlet tube between the buried garden pipeline and indoor (in building) pipeline of outdoor (building is outer).
Two kinds are mainly contained in northern China cold area (ground such as three provinces in the northeast of China, Inner Mongol) gas service pipe form, one is that buried garden arm is on the basis of building, upwards be crossing to 300mm place on outdoor ground along building foundation outside vertical, more horizontal passing through building exterior wall enters indoor; Two is, after buried garden arm crosses building foundation from underground horizontal, be upwards crossing to 900mm place on flooring along building foundation inner vertical.That is, one has two kinds of modes, front one be first by vertical tube to ground, then introduced by horizontal pipe more than ground, rear one be first by horizontal pipe at ground downward-extension, then by vertical tube upwards go out ground introduce.Under normal circumstances, complete at building, even the construction of gas works is just carried out in geothermal heating after having laid completion after the completion of the cement surface layer of flooring, because the second combustion gas incorporation way needs to tear down indoor cement flooring, real estate developer does not generally agree to this form of construction work, nor be applicable to the situation that completion has been laid in geothermal heating, therefore the first combustion gas incorporation way the most often adopts.
The first incorporation way easily occur gas service pipe winter frozen block situation, the water vapor that contains in artificial coal gas and the halfway rock gas of dehydration, when when the dew point of inner-walls of duct temperature lower than institute's delivery of fuel gas, water vapor can condense into water, when when the inner wall temperature of pipeline is lower than 0 DEG C, water vapor in inner-walls of duct frosting, formation frozen block of freezing, can have a strong impact on air feed.The frozen block in winter of northern China cold area (ground such as three provinces in the northeast of China, Inner Mongol) gas service pipe is common, Yi Fa, multiple event, can not normally use.
And, soil freezing heave can produce destructive to inlet tube, the moisture content of soil is generally between 15% ~ 85%, northern China cold area (ground such as three provinces in the northeast of China, Inner Mongol) in the winter time, soil on soil frost line produces expansion because of freezing of water, and the gas service pipe vertical section that vertical section is embedded in frozen soil can be swept along upwards drawing by frozen soil, if do not have effective protective measures, huge stress rupture can be produced to pipe-line system, lose efficacy and leak gas, can not normally use.
Therefore, how providing a kind of combustion gas prefabricated pipe fitting, to ensure normal use, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of combustion gas prefabricated pipe fitting, to ensure normal use; Another object of the present invention is to provide a kind of making method of above-mentioned combustion gas prefabricated pipe fitting.
For solving the problems of the technologies described above, the invention provides following scheme:
A kind of combustion gas prefabricated pipe fitting, comprise outer tube, interior pipe and foaming layer, described foaming layer is filled with between described outer tube and described interior pipe, and described interior pipe is comprised the steel pipe be communicated with by link and lengthens section steel plastic conversion part and polyethylene pipe.
Preferably, above-mentioned link is electric melting sleeve.
Preferably, the outer wall that above-mentioned steel pipe lengthens the steel tubing portions of section steel plastic conversion part is provided with epoxy enamelled coating.
Preferably, above-mentioned interior pipe and described outer concentric tube are coaxially arranged.
Preferably, above-mentioned foaming layer is mechanical pressurization foaming layer.
Preferably, the thickness of above-mentioned foaming layer is 90mm-110mm.
Preferably, above-mentioned interior pipe is identical with described outer length of tube.
The present invention also provides a kind of combustion gas prefabricated pipe fitting making method, comprising: step 1) steel pipe is lengthened section steel plastic conversion part and polyethylene pipe is connected and fixed by link; Step 2) described steel pipe manages in lengthening and being formed after section steel plastic conversion part is connected with described polyethylene pipe, is built in outer tube by described interior pipe; Step 3) to the fill gaps foaming between described interior pipe and described outer tube.
Preferably, above-mentioned steel pipe lengthening section steel plastic conversion part and described polyethylene pipe are welded to connect by electric melting sleeve.
Preferably, the mode filling-foam of mechanical pressurization is passed through between above-mentioned interior pipe and described outer tube.
The combustion gas prefabricated pipe fitting that the invention described above provides, the pipe be mainly used in as vertical section uses, comprise outer tube, interior pipe and foaming layer, described foaming layer is filled with between described outer tube and described interior pipe, and described interior pipe is comprised the steel pipe be communicated with by link and lengthens section steel plastic conversion part and polyethylene pipe.Outer tube itself is a pipe, so be equivalent to combustion gas prefabricated pipe fitting provided by the present invention only use as a pipe fitting, farthest reduce the risk of gas leakage, secondly, utilize the earth soil heat capacity simultaneously, and the thermal resistance mutual security of the thermal resistance of soil and foaming layer, solve the difficult problem that water vapour easily freezes, and, owing to have employed polyethylene pipe as overcoat, utilize polyethylene surface smooth, not the characteristic of hydrophilic radical, to solve when Frost heave of frozen soil by the problem that drawing destroys, ensure that the normal use of self.
Accompanying drawing explanation
The structural representation of the combustion gas prefabricated pipe fitting that Fig. 1 provides for the embodiment of the present invention.
In upper Fig. 1:
Steel pipe lengthens section steel plastic conversion part 1, polyethylene pipe 2, outer tube 3, foaming layer 4, link 5, ground 6, horizontal pipe 7, electric smelting elbow 8.
Embodiment
In order to make those skilled in the art understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, the structural representation of the combustion gas prefabricated pipe fitting that the embodiment of the present invention provides.
The combustion gas prefabricated pipe fitting that the embodiment of the present invention provides, the pipe be mainly used in as vertical section uses, comprise outer tube 3, interior pipe and foaming layer 4, foaming layer 4 is filled with between outer tube 3 and interior pipe, and interior pipe is comprised the steel pipe be communicated with by link 5 and lengthens section steel plastic conversion part 1 and polyethylene pipe 2.Outer tube 3 itself is a pipe, so be equivalent to combustion gas prefabricated pipe fitting provided by the present invention only use as a pipe fitting, farthest reduce the risk of gas leakage, secondly, utilize the earth soil heat capacity simultaneously, and the thermal resistance mutual security of the thermal resistance of soil and foaming layer, solve the difficult problem that water vapour easily freezes, and, owing to have employed polyethylene pipe 2 as overcoat, utilize polyethylene surface smooth, not the characteristic of hydrophilic radical, to solve when Frost heave of frozen soil by the problem that drawing destroys, ensure that the normal use of self.
Wherein, link 5 is advisable with electric melting sleeve, can directly link together by welding pipe steel pipe being lengthened section steel plastic conversion part 1 and polyethylene pipe 2 two kinds of unlike materials.Interior pipe and outer tube 3 are set to suitable with concentric co-axial, interior pipe is preferably identical with outer tube 4 length, such foaming layer 4 uniform in foaming and between inner and outer tubes 3 uniform filling.Concrete, foaming layer 4 is mechanical pressurization foaming layer, by the mode of mechanical pressurization, realizes the filling of foaming layer, and filling is more even and density is higher, and foaming layer 3 can be polyurethane foaming layer, is not less than 60kg/m with the density of foaming layer 3
3, its thermal conductivity is not more than 0.028w/ (m.k) and is advisable.
In order to optimize such scheme further, the outer wall of the steel tubing portions of steel pipe lengthening section steel plastic conversion part 1 being provided with epoxy enamelled coating, for anticorrosion, solve and carrying out the outer uncontrollable problem of anticorrosive quality of steel tubing at the construction field (site).
The embodiment of the present invention also provides a kind of combustion gas prefabricated pipe fitting making method, comprising: step 1) steel pipe is lengthened section steel plastic conversion part 1 and polyethylene pipe 2 is connected and fixed by link 5; Step 2) steel pipe lengthens section steel plastic conversion part 1 and is connected pipe in rear formation with polyethylene pipe 2, be built in by interior pipe in outer tube 3; Step 3) to the fill gaps foaming between inner and outer tubes 3.Utilize and foaming layer 4 is formed to the fill gaps foaming between inner and outer tubes 3, avoid water vapour to freeze and block, avoid destructive drawing during Frost heave of frozen soil.
Concrete, at the scene during practical application:
The buried depth of horizontal pipe 7 is local maximum depth of frozen ground, the outer wall epoxy paint lengthening section steel plastic conversion part 1 to steel pipe does that to add intensity level anticorrosion, then by electric melting sleeve steel pipe lengthened section steel plastic conversion part 1 and polyethylene pipe 2 is welded to connect, and intensity and bubble-tight test are done to electric melting sleeve, then be fixedly installed with outer tube 3 concentric co-axial, the diameter of outer tube 3 is advisable with 200mm, wall thickness is advisable with 2mm, outer tube 3 adopts polyethylene pipe, utilize polyethylene surface smooth, the not characteristic of hydrophilic radical, solve when Frost heave of frozen soil by problem that drawing destroys, ensure that the normal use of self, then by mechanical pressurization polyurethane foam, 60kg/m is not less than with the density of foaming layer 4
3its thermal conductivity is not more than 0.028w/ (m.k) and is advisable, mechanical pressurization foaming overcomes that job site natural foaming density is low, the poor problem causing managing interior frosting frozen block of heat insulation effect, overcomes the problem that can not use polyethylene pipe in frozen soil simultaneously, finally forms combustion gas prefabricated pipe fitting.
During site operation, first groove is dug, then the pipe of horizontal segment is laid, i.e. horizontal pipe 7, then combustion gas prefabricated pipe fitting is installed, combustion gas prefabricated pipe fitting is communicated with by electric smelting elbow 8 with horizontal pipe 7, and the steel pipe of this combustion gas prefabricated pipe fitting lengthens the end face 0.4m above ground level of section steel plastic conversion part 1, and its polyethylene pipe 2 is in the position of underground below 200mm.
Wherein, foaming layer 4 uses as thermal insulation layer, and adopt the foaming of hard polyurethane fat, density is 60kg/m
3, thermal conductivity λ≤0.028w/ (m.k) (in GB/T29047-2012 standard during polyurethane foam plastic 50 DEG C thermal conductivity λ≤0.033w/m.k).Select the finished product polyurethane foaming insulation inlet tube of factory process, polyurethane foaming insulation layer thickness controls at about 100mm, such as, the thickness of foaming layer is 90mm-110mm, under the condition that boundary conditions is identical, thinking of can the being similar to soil moisture content that the hard polyurethane fat insulating foam layer of unit thickness is equivalent to is 35 times of 15% thickness of soil, therefore buried polyurethane foaming insulation layer thickness controls when 100mm, and heat insulation effect at least can reach the standard frost penetration of In Changchun County-1690mm.
In addition, outer tube 3 can also use as watertightness barrier, because thermal insulation layer must have waterproof protecting layer guarantee, thermal conductivity does not improve, and reaches the heat insulation effect of expection.Outer pillar shell (the tensile yield strength > 25MPa that Changchun combustion gas adopts pure polyethylene raw material to process; Elongation at break > 400%; Longitudinal welds < 3%), because yield strength is high, elongation at break is large, not easy-rupturing; Longitudinal welds is little, and Anti-temperature difference is effective, for there is not obvious brittle failure phenomenon during-35 DEG C, the Northeast.
And, the steel tubing portions that existing steel is moulded on conversion part is shorter, the height being lengthened to valve installation with one section of galvanized pipe is needed after going out ground, the method that conversion part lengthens directly moulded by steel by present employing, namely adopt steel pipe to lengthen section steel plastic conversion part 1, be in fact exactly that to mould conversion part be integral type structure for original galvanized pipe and steel, save a pipe fitting, lack two interfaces, strengthen sealing effect.
Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a combustion gas prefabricated pipe fitting, is characterized in that, comprises outer tube, interior pipe and foaming layer, and described foaming layer is filled with between described outer tube and described interior pipe, and described interior pipe is comprised the steel pipe be communicated with by link and lengthens section steel plastic conversion part and polyethylene pipe.
2. combustion gas prefabricated pipe fitting according to claim 1, is characterized in that, described link is electric melting sleeve.
3. combustion gas prefabricated pipe fitting according to claim 1, is characterized in that, the outer wall of the steel tubing portions of described steel pipe lengthening section steel plastic conversion part is provided with epoxy enamelled coating.
4. combustion gas prefabricated pipe fitting according to claim 1, is characterized in that, described interior pipe and described outer concentric tube are coaxially arranged.
5. combustion gas prefabricated pipe fitting according to claim 1, is characterized in that, described foaming layer is mechanical pressurization foaming layer.
6. combustion gas prefabricated pipe fitting according to claim 5, is characterized in that, the thickness of described foaming layer is 90mm-110mm.
7. combustion gas prefabricated pipe fitting according to claim 5, is characterized in that, described interior pipe is identical with described outer length of tube.
8. a combustion gas prefabricated pipe fitting making method, is characterized in that, comprising: step 1) steel pipe is lengthened section steel plastic conversion part and polyethylene pipe is connected and fixed by link; Step 2) described steel pipe manages in lengthening and being formed after section steel plastic conversion part is connected with described polyethylene pipe, is built in outer tube by described interior pipe; Step 3) to the fill gaps foaming between described interior pipe and described outer tube.
9. combustion gas prefabricated pipe fitting making method according to claim 8, is characterized in that, described steel pipe lengthens section steel plastic conversion part and described polyethylene pipe is welded to connect by electric melting sleeve.
10. combustion gas prefabricated pipe fitting making method according to claim 8, is characterized in that, by the mode filling-foam of mechanical pressurization between described interior pipe and described outer tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510387978.2A CN104930270B (en) | 2015-07-06 | 2015-07-06 | A kind of prefabricated pipe fitting and preparation method thereof for combustion gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510387978.2A CN104930270B (en) | 2015-07-06 | 2015-07-06 | A kind of prefabricated pipe fitting and preparation method thereof for combustion gas |
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| Publication Number | Publication Date |
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| CN104930270A true CN104930270A (en) | 2015-09-23 |
| CN104930270B CN104930270B (en) | 2016-05-25 |
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Citations (7)
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| CN2699103Y (en) * | 2004-05-24 | 2005-05-11 | 大庆油田长垣管业有限公司 | Shot skeleton plastic composite electric melting sleeve |
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| CN1862070A (en) * | 2005-09-29 | 2006-11-15 | 董源 | Self-compensation high-temp resistance prefabricated direct-buried heat insulation pipe |
| CN2937720Y (en) * | 2006-08-14 | 2007-08-22 | 北京京燃凌云燃气设备有限公司 | Anti-electrostatic direct-buriried diffusion valve device for gas pipe net |
| CN201803021U (en) * | 2010-09-08 | 2011-04-20 | 上海大众燃气有限公司 | Combustion gas underground inlet pipe |
| CN103968190A (en) * | 2014-05-07 | 2014-08-06 | 宁波万里管道有限公司 | Prefabricated overhead heat insulation pipe |
| CN204756196U (en) * | 2015-07-06 | 2015-11-11 | 长春燃气热力设计研究院有限责任公司 | Gas is with prefabricated pipe fitting |
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2015
- 2015-07-06 CN CN201510387978.2A patent/CN104930270B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2699103Y (en) * | 2004-05-24 | 2005-05-11 | 大庆油田长垣管业有限公司 | Shot skeleton plastic composite electric melting sleeve |
| CN2784708Y (en) * | 2005-03-23 | 2006-05-31 | 齐齐哈尔阳光热力集团万容保温材料有限责任公司 | Prefabricated thermal insulating pipe made of composite material |
| CN1862070A (en) * | 2005-09-29 | 2006-11-15 | 董源 | Self-compensation high-temp resistance prefabricated direct-buried heat insulation pipe |
| CN2937720Y (en) * | 2006-08-14 | 2007-08-22 | 北京京燃凌云燃气设备有限公司 | Anti-electrostatic direct-buriried diffusion valve device for gas pipe net |
| CN201803021U (en) * | 2010-09-08 | 2011-04-20 | 上海大众燃气有限公司 | Combustion gas underground inlet pipe |
| CN103968190A (en) * | 2014-05-07 | 2014-08-06 | 宁波万里管道有限公司 | Prefabricated overhead heat insulation pipe |
| CN204756196U (en) * | 2015-07-06 | 2015-11-11 | 长春燃气热力设计研究院有限责任公司 | Gas is with prefabricated pipe fitting |
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| CN104930270B (en) | 2016-05-25 |
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