CN104279389A - Intelligent prefabricated directly-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducer tee joint - Google Patents
Intelligent prefabricated directly-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducer tee joint Download PDFInfo
- Publication number
- CN104279389A CN104279389A CN201410499099.4A CN201410499099A CN104279389A CN 104279389 A CN104279389 A CN 104279389A CN 201410499099 A CN201410499099 A CN 201410499099A CN 104279389 A CN104279389 A CN 104279389A
- Authority
- CN
- China
- Prior art keywords
- pipe fitting
- crosslinked polyethylene
- thermal insulation
- pipe
- buried thermal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 56
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 56
- 238000009413 insulation Methods 0.000 title claims abstract description 48
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 12
- 239000004698 Polyethylene Substances 0.000 claims abstract description 16
- 229920002635 polyurethane Polymers 0.000 claims abstract description 13
- 239000004814 polyurethane Substances 0.000 claims abstract description 13
- 238000005187 foaming Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 238000009434 installation Methods 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 229920001903 high density polyethylene Polymers 0.000 claims description 10
- 239000004700 high-density polyethylene Substances 0.000 claims description 10
- 239000006260 foam Substances 0.000 claims description 7
- 239000011493 spray foam Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000007730 finishing process Methods 0.000 claims description 4
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000011496 polyurethane foam Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 5
- 230000001681 protective effect Effects 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000272165 Charadriidae Species 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/02—Branch units, e.g. made in one piece, welded, riveted
-
- 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
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Building Environments (AREA)
- Thermal Insulation (AREA)
Abstract
The invention relates to an intelligent prefabricated directly-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducer tee joint and aims to solve the problems that steel thermal insulation pipe reducer tee joints are generally used for cold and heat supplying of three-level pipe networks, the steel thermal insulation pipe reducer tee joints need to be constantly cut and welded when being mounted in community unit passageways, and construction difficulty is increased greatly. The intelligent prefabricated directly-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducer tee joint comprises a crosslinked polyethylene working pipe fitting reducer tee joint body (7). The crosslinked polyethylene working pipe fitting reducer tee joint body (7) comprises a vertical working pipe fitting (6) and a horizontal working pipe fitting (4). A PE outer protective pipe (1) sleeves the crosslinked polyethylene working pipe fitting reducer tee joint body. A polyurethane thermal insulation layer (3) is disposed inside the PE outer protective pipe. Two vertical alarming lines (5), the vertical working pipe fitting, two horizontal alarming lines (2) and the horizontal working pipe fitting are respectively mounted in the polyurethane thermal insulation layer.
Description
technical field:
the present invention relates to the prefabricated direct-buried thermal insulation pipe road career field of city cooling, heat supply, be specifically related to a kind of intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee.
background technique:
at present, it is domestic that what generally adopt for triode net cold and heat supply is all steel insulating pipe reducing tee preparation process, continuous intercept is needed to weld and add a large amount of difficulty of construction when installing in cell unit corridor, a large amount of economic losses is created from construction cost, thermal losses has occurred a large amount of unnecessary losses, and pipeline conveying aspect also exists steel pipe and to get rusty the problems such as operation troubles.Original technology and technique, will not reach the performance of prefabricated direct-buried thermal insulation pipe crosslinked polyethylene work pipe fitting reducing far away in environmental protection, energy-conservation, economy, safety, stability etc.
employing Direct-Buried Heating Pipeline technology, indicates that Chinese heat supply pipeline technical development has entered new starting point, and along with improving further and development of this advanced technology, heat supply pipeline direct-burried replaces trench with built on stilts imperative.
summary of the invention:
the object of this invention is to provide a kind of intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee.
above-mentioned object is realized by following technological scheme:
a kind of intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee, its composition comprises: crosslinked polyethylene work pipe fitting reducing tee, described crosslinked polyethylene work pipe fitting reducing tee comprises the pipe fitting that vertically works, horizontal operation pipe fitting, described crosslinked polyethylene work pipe fitting reducing tee outer cover has the outer pillar of PE, described PE is equipped with polyurethane insulation coating in outer pillar inside, and 2 vertical alarming lines, described vertical work pipe fitting, 2 horizontal alarming lines, described horizontal operation pipe fittings are housed in described polyurethane insulation coating respectively.
described intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee, described vertical alarming line and the described parallel installation of vertical work pipe fitting, described horizontal alarming line and the described parallel installation of horizontal operation pipe fitting.
described intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee, 2 described parallel installations of vertical alarming line, 2 described parallel installations of horizontal alarming line, described vertical work pipe fitting is vertical with described horizontal operation pipe fitting to be arranged.
the described two-tube pipe fitting reducing tee of intelligent prefabricated direct-buried thermal insulation pipe working steel tube, described vertical work pipe fitting and described horizontal operation pipe fitting are reducers
a making method for intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee, the method comprises the steps:
first crosslinked polyethylene is adopted to be pipeline foundation raw material, at the surface spraying polyurethane foam of crosslinked polyethylene, adopt ring penta ball foaming technique, foaming machine spray foam foams, outer pillar adopts high density polyethylene (HDPE) and HDPE100 level raw material, be made into intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee
by crosslinked polyethylene work pipe fitting according to vertically work pipe fitting and the mutually perpendicular requirement of horizontal operation pipe fitting, install mounting bracket, the high density polyethylene pipe part material of different amount is made to form the outer pillar of intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene work pipe fitting by highi degree of accuracy PE welding gun, then pipe ends installed foaming guard seal and leave exhaust sieve, eventually pass foaming machine spray foam to foam, carry out end face finishing process after slaking, after more than completing, namely form final finished.
beneficial effect:
1. the present invention adopts direct-buried insulated pipe crosslinked polyethylene work pipe fitting reducing tee to be cold and heat supply pipeline new technology, adopt the outer pillar protection of the PE described in foaming technique use, described high density polyethylene 100 material has good steam-preventing, there is fabulous impact resistance, along with development that is industrial and urban duct industry, progressively will substitute heavy wall clarinet, the rainwater drainage pipe that diameter hollow wall is effective to be made as concrete and other sewerage pipeline, the outer pillar of described PE is used to greatly reduce heat loss, effectively reduce user cost and decrease carbon emission amount, the cost of production of this type of pipe fitting can be reduced, improve manufacturing efficiency.
the present invention adopts crosslinked polyethylene work pipe fitting, conveying aspect can be avoided to there is steel pipe and to get rusty the problems such as operation troubles.
the present invention adopts crosslinked polyethylene work pipe fitting, during use, can directly intercept required size, convenient, environmental protection, reduces in the past in cell unit corridor simultaneously, needs continuous intercept welded steel pipe when installing cold and heat supply pipe fitting, decrease difficulty of construction, reduce construction cost.
crosslinked polyethylene selected by work pipe fitting of the present invention, crosslinked polyethylene has excellent resistance to low temperature, chemical stability is good, the erosion of the most of soda acid of ability, be insoluble to common solvent under normal temperature, moisture absorption is little, electrical insulation capability is excellent, cross-linking polyethylene materials, oil resistant, heat-resisting, fast light, wear-resisting and tensile strength are better, are the good elastomers of a kind of combination property.
the PE that the present invention adopts is equipped with polyurethane insulation coating in outer pillar inside, respectively alarming line is housed in described polyurethane insulation coating, crosslinked polyethylene work pipe elbow, this structure can play heat insulation work pipe fitting, the working life of prolongation work pipe fitting, respectively alarming line is housed in layer, crosslinked polyethylene work pipe fitting, this structure can play heat-insulating pipe fitting, extend the effect in pipe fitting working life, 2 alarming line prevention pipes are housed simultaneously and there is seepage, described alarming line can detect the moisture that described polyurethane insulation coating internal work pipe fitting leaks out, simultaneously, also can detect that the moisture of polyurethane insulation coating inside is infiltrated in the outer pillar outside of PE, alarm function is played in alarming line conducting.
the convenience that the present invention adopts prefabricated direct-buried thermal insulation pipe crosslinked polyethylene work pipe fitting to install is far longer than traditional type thermal insulation pipe; Heat loss 34% can be saved in heat waste consumption; Year cost-saving 34% can be reached in operating cost; Can 34% be reduced in minimizing carbon emission amount; Can meet international standards in working life minimum 30 years; Operating cost can save 54%.
polyurethane insulation coating of the present invention, adopt ring penta ball foaming technique, foaming machine spray foam foams, end face finishing process is carried out after slaking, this foaming technique environmental protection, the performance standard that energy-conservation, the aspect such as economy, safety, stability reaches prefabricated direct-buried thermal insulation pipe work pipe fitting, the environmental protection again of a kind of economy, not only energy-conservation but also reduce discharging, not only stable but also safe city cold and heat supply conveying pipe fitting.
vertical working steel tube of the present invention and described horizontal operation pipe fitting are reducers, and this structure can need according to pipeline the pipe connecting different bore.
accompanying drawing illustrates:
accompanying drawing 1 is structural representation of the present invention.
accompanying drawing 2 is plan views of accompanying drawing 1.
accompanying drawing 3 is left views of accompanying drawing 1.
accompanying drawing 4 is A-A sectional views of accompanying drawing 1.
accompanying drawing 5 is B-B sectional views of accompanying drawing 1.
accompanying drawing 6 is stereograms of the present invention.
in figure: same-sign circuit guides has annexation.
embodiment:
embodiment 1:
a kind of intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee, its composition comprises: crosslinked polyethylene work pipe fitting reducing tee 7, described crosslinked polyethylene work pipe fitting reducing tee comprises vertically work pipe fitting 6, horizontal operation pipe fitting 4, described crosslinked polyethylene work pipe fitting reducing tee outer cover has the outer pillar 1 of PE, described PE is equipped with polyurethane insulation coating 3 in outer pillar inside, and 2 vertical alarming lines 5, described vertical work pipe fitting, 2 horizontal alarming lines 2, described horizontal operation pipe fittings are housed in described polyurethane insulation coating respectively.
embodiment 2:
intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee according to embodiment 1, described vertical alarming line and the described parallel installation of vertical work pipe fitting, described horizontal alarming line and the described parallel installation of horizontal operation pipe fitting.
embodiment 3:
intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee according to embodiment 1 or 2,2 described parallel installations of vertical alarming line, 2 described parallel installations of horizontal alarming line, described vertical work pipe fitting is vertical with described horizontal operation pipe fitting to be arranged.
embodiment 4:
intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee according to embodiment 1 or 2 or 3, described vertical work pipe fitting and described horizontal operation pipe fitting are reducers, use in the pipeline that bore is different.
embodiment 5:
a making method for intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee, the method comprises the steps:
first crosslinked polyethylene is adopted to be pipeline foundation raw material, at the surface spraying polyurethane foam of crosslinked polyethylene, adopt ring penta ball foaming technique, foaming machine spray foam foams, outer pillar adopts high density polyethylene (HDPE) and HDPE100 level raw material, is made into intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee.
by crosslinked polyethylene work pipe fitting according to vertically work pipe fitting and the mutually perpendicular requirement of horizontal operation pipe fitting, install mounting bracket, the high density polyethylene pipe part material of different amount is made to form the outer pillar of intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene work pipe fitting by highi degree of accuracy PE welding gun, then pipe ends installed foaming guard seal and leave exhaust sieve, eventually pass foaming machine spray foam to foam, carry out end face finishing process after slaking, after more than completing, namely form final finished.
Claims (5)
1. an intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee, its composition comprises: crosslinked polyethylene work pipe fitting reducing tee, it is characterized in that: described crosslinked polyethylene work pipe fitting reducing tee comprises the pipe fitting that vertically works, horizontal operation pipe fitting, described crosslinked polyethylene work pipe fitting reducing tee outer cover has the outer pillar of PE, described PE is equipped with polyurethane insulation coating in outer pillar inside, and 2 vertical alarming lines, described vertical work pipe fitting, 2 horizontal alarming lines, described horizontal operation pipe fittings are housed in described polyurethane insulation coating respectively.
2. intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee according to claim 1, it is characterized in that: described vertical alarming line and the described parallel installation of vertical work pipe fitting, described horizontal alarming line and the described parallel installation of horizontal operation pipe fitting.
3. intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee according to claim 1 and 2, it is characterized in that: 2 described parallel installations of vertical alarming line, 2 described parallel installations of horizontal alarming line, described vertical work pipe fitting is vertical with described horizontal operation pipe fitting to be arranged.
4. the intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee according to claim 1 or 2 or 3, described vertical work pipe fitting and described horizontal operation pipe fitting are reducers.
5. a making method for the intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee that one of claim 1-4 is described, is characterized in that: the method comprises the steps:
First crosslinked polyethylene is adopted to be pipeline foundation raw material, at the surface spraying polyurethane foam of crosslinked polyethylene, adopt ring penta ball foaming technique, foaming machine spray foam foams, outer pillar adopts high density polyethylene (HDPE) and HDPE100 level raw material, be made into intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee
By crosslinked polyethylene work pipe fitting according to vertically work pipe fitting and the mutually perpendicular requirement of horizontal operation pipe fitting, install mounting bracket, the high density polyethylene pipe part material of different amount is made to form the outer pillar of intelligent prefabricated direct-buried thermal insulation pipe crosslinked polyethylene work pipe fitting by highi degree of accuracy PE welding gun, then pipe ends installed foaming guard seal and leave exhaust sieve, eventually pass foaming machine spray foam to foam, carry out end face finishing process after slaking, after more than completing, namely form final finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410499099.4A CN104279389A (en) | 2014-09-26 | 2014-09-26 | Intelligent prefabricated directly-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducer tee joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410499099.4A CN104279389A (en) | 2014-09-26 | 2014-09-26 | Intelligent prefabricated directly-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducer tee joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104279389A true CN104279389A (en) | 2015-01-14 |
Family
ID=52254564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410499099.4A Pending CN104279389A (en) | 2014-09-26 | 2014-09-26 | Intelligent prefabricated directly-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducer tee joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104279389A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523827A (en) * | 2016-12-27 | 2017-03-22 | 哈尔滨朗格思特供热装备科技有限公司 | Flexible polyurethane heat preservation pipe fitting tee joint and manufacturing method |
| CN112161101A (en) * | 2020-10-22 | 2021-01-01 | 刘志峰 | Polyurethane spraying outer protective pipe spraying integrally formed prefabricated thermal insulation valve and spraying method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20204399U1 (en) * | 2002-03-19 | 2003-04-30 | REHAU AG + Co., 95111 Rehau | Parallel twin hot water pipe centreline axes offset in district heating system |
| CN2670720Y (en) * | 2003-07-31 | 2005-01-12 | 无锡市金龙波纹补偿器厂 | Buried heat transfer tee pipe section with small thermal displacement |
| CN201982890U (en) * | 2011-01-28 | 2011-09-21 | 北京豪特耐管道设备有限公司 | Prefabricated polyurethane foam insulating pipe for trenches |
| CN202493835U (en) * | 2012-04-12 | 2012-10-17 | 天津天地龙管业有限公司 | Novel distribution and connection device |
| CN103851273A (en) * | 2014-03-14 | 2014-06-11 | 吉林建筑大学 | PPR-PVC (polypropylene-polyvinyl chloride) water supply pipeline |
| CN103912736A (en) * | 2014-04-19 | 2014-07-09 | 辽宁久大管业有限公司 | Combined directly buried prefabricated heat-insulation water and steam delivery method |
| CN204187193U (en) * | 2014-09-26 | 2015-03-04 | 哈尔滨朗格斯特节能科技有限公司 | Intelligence prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee |
-
2014
- 2014-09-26 CN CN201410499099.4A patent/CN104279389A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20204399U1 (en) * | 2002-03-19 | 2003-04-30 | REHAU AG + Co., 95111 Rehau | Parallel twin hot water pipe centreline axes offset in district heating system |
| CN2670720Y (en) * | 2003-07-31 | 2005-01-12 | 无锡市金龙波纹补偿器厂 | Buried heat transfer tee pipe section with small thermal displacement |
| CN201982890U (en) * | 2011-01-28 | 2011-09-21 | 北京豪特耐管道设备有限公司 | Prefabricated polyurethane foam insulating pipe for trenches |
| CN202493835U (en) * | 2012-04-12 | 2012-10-17 | 天津天地龙管业有限公司 | Novel distribution and connection device |
| CN103851273A (en) * | 2014-03-14 | 2014-06-11 | 吉林建筑大学 | PPR-PVC (polypropylene-polyvinyl chloride) water supply pipeline |
| CN103912736A (en) * | 2014-04-19 | 2014-07-09 | 辽宁久大管业有限公司 | Combined directly buried prefabricated heat-insulation water and steam delivery method |
| CN204187193U (en) * | 2014-09-26 | 2015-03-04 | 哈尔滨朗格斯特节能科技有限公司 | Intelligence prefabricated direct-buried thermal insulation pipe crosslinked polyethylene pipe fitting reducing tee |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523827A (en) * | 2016-12-27 | 2017-03-22 | 哈尔滨朗格思特供热装备科技有限公司 | Flexible polyurethane heat preservation pipe fitting tee joint and manufacturing method |
| CN112161101A (en) * | 2020-10-22 | 2021-01-01 | 刘志峰 | Polyurethane spraying outer protective pipe spraying integrally formed prefabricated thermal insulation valve and spraying method |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150114 |
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| RJ01 | Rejection of invention patent application after publication |