CN112608116A - High-strength heat insulation pipe shell and preparation method thereof - Google Patents
High-strength heat insulation pipe shell and preparation method thereof Download PDFInfo
- Publication number
- CN112608116A CN112608116A CN202011620237.1A CN202011620237A CN112608116A CN 112608116 A CN112608116 A CN 112608116A CN 202011620237 A CN202011620237 A CN 202011620237A CN 112608116 A CN112608116 A CN 112608116A
- Authority
- CN
- China
- Prior art keywords
- heat
- strength
- pipe shell
- mixing
- silicon powder
- 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
- 238000009413 insulation Methods 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 150000004645 aluminates Chemical class 0.000 claims abstract description 15
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003349 gelling agent Substances 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000007580 dry-mixing Methods 0.000 claims abstract description 3
- 238000004321 preservation Methods 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 6
- 230000005484 gravity Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 239000011325 microbead Substances 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 238000005336 cracking Methods 0.000 description 11
- 238000009826 distribution Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- 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
- F16L59/021—Shape or form of insulating materials, with or without coverings integral with the insulating materials comprising a single piece or sleeve, e.g. split sleeve, two half sleeves
-
- 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
- F16L59/12—Arrangements for supporting insulation from the wall or body insulated, e.g. by means of spacers between pipe and heat-insulating material; Arrangements specially adapted for supporting insulated bodies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Thermal Insulation (AREA)
Abstract
The invention relates to an accessory matched with a pipeline, in particular to a high-strength heat-insulation pipe shell and a preparation method thereof. The high-strength heat-insulating pipe shell mainly comprises 20-24 wt% of vitrified micro-beads, light ceramsite, micro-silicon powder, anti-crack fibers and aluminate gelling agent: 40-45: 3-5: 3-4: 26-30 of water, and curing after mixing. The preparation method comprises the following steps: 1) uniformly dry-mixing the vitrified micro bubbles, the light ceramsite, the micro silicon powder, the anti-crack fibers and the aluminate gelling agent according to the proportion; 2) adding water for wet mixing to obtain a mixture; 3) putting the mixture into a die, vibrating by a vibrating rod, and flattening the outer surface; 4) and (5) demolding, and then stably curing to obtain the product. The composite material has the advantages of light weight, high strength, low heat conductivity coefficient and good vibration and crack resistance. Low cost, simple process and easy industrialized production. The heat-insulating support is used for heat pipelines and gravity thermal equipment of petrochemical engineering, thermal power plants, pharmacy and heating projects.
Description
Technical Field
The invention relates to an accessory matched with a pipeline, in particular to a high-strength heat-insulation pipe shell and a preparation method thereof.
Background
At present, in long-distance high-temperature conveying pipelines used in petrochemical industry, electric power industry, metallurgy industry and other industries, in order to reduce heat energy loss in a medium transmission process, heat insulation measures are taken at a supporting part of the pipeline, and a heat insulation layer is a special high-strength heat insulation material. The high-strength heat-conducting pipe has to be used for supporting the load of the pipeline, and has low heat conductivity coefficient, so that the heat energy leakage is effectively blocked. Most of heat insulation pipe brackets popular in the market mostly adopt common temperature resistant casting materials, the heat insulation layers have the problems of poor heat insulation effect, small toughness, easy fragmentation, heavy weight and the like although the strength is high, the heat insulation layers are generally cracked due to vibration, stress alternation and dynamic load in the operation of a heat distribution pipeline, part of heat energy leaks from the cracking part to cause the attenuation of the transmission temperature of the heat distribution pipeline, and the cracking of the heat insulation layers reduces the support performance of the pipe brackets, thereby causing safety troubles to the long-term stable operation of the pipeline.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-strength heat-insulation pipe shell which is light in weight, high in strength, low in heat conductivity coefficient and good in anti-vibration and anti-cracking performance, solves the technical problems that the strength and the heat-insulation performance of a heat-insulation material in the prior art cannot be considered simultaneously and the anti-vibration and anti-cracking performance is poor, and is used for heat-insulation support of thermal pipelines and gravity thermal equipment in petrochemical engineering, thermal power plants, pharmacy and heating engineering. The invention also provides a preparation method, which has low cost and simple process and is easy for industrialized production.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the high-strength heat-insulating pipe shell is mainly formed by mixing and solidifying vitrified micro bubbles, light ceramic particles, micro silicon powder, anti-crack fibers and aluminate gelatinizing agents by adopting machinery and a mould.
The weight percentages of the vitrified micro bubbles, the light ceramsite, the micro silicon powder, the anti-crack fiber and the aluminate gelling agent are 20-24: 40-45: 3-5: 3-4: 26-30.
Preferably, the vitrified micro bubbles, the light ceramsite, the micro silicon powder, the anti-crack fibers and the aluminate gelling agent are 20: 45: 4: 3: 28.
the vitrified micro bubbles have the characteristics of good particle integrity, low breakage rate during mixing and high initial strength.
The vitrified micro bubbles and the light ceramsite play roles in heat insulation and preservation, the micro silicon powder can improve the strength and the high temperature resistance of the mixture, the anti-cracking fiber can improve the anti-cracking performance of the mixture, and the aluminate gelling agent has high bonding strength, good high temperature performance and good hydrophobicity. The high-strength heat-insulating pipe shell prepared by mixing the five materials has the advantages of high strength, low heat conductivity coefficient, excellent crack resistance, low cost, good process and the like.
The vitrified micro bubbles and the light ceramsite mainly play a role in heat insulation and preservation, and when the mixture accounts for a large proportion, the heat conductivity coefficient is reduced, so that the strength is influenced; when the micro silicon powder and the aluminate gelatinizer account for a large specific gravity, the heat conductivity coefficient can be increased, the strength is increased, and a proper amount of anti-cracking fibers can play a good anti-cracking role.
The preparation method of the high-strength heat insulation pipe shell comprises the following steps:
1) putting the vitrified micro bubbles, the light ceramsite, the micro silicon powder, the anti-crack fibers and the aluminate gelling agent into a mixing container according to the proportion, and dry-mixing uniformly;
2) adding 55-65kg of water into the mixing container for wet mixing to obtain a mixture;
3) putting the mixture into a mould, adopting a vibrating rod to vibrate to prevent air holes, and flattening the outer surface;
4) demoulding for 6-12 hours, and forming the high-strength heat-insulating pipe shell after 5-7 days of stable solidification.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention relates to a high-strength heat-insulating pipe shell which is mainly prepared by mixing vitrified micro-beads, light ceramsite, micro-silicon powder, anti-crack fibers and aluminate gelling agent. The vitrified micro bubbles and the light ceramsite belong to light heat-insulating materials, can play a good role in heat insulation and heat preservation, a proper amount of anti-cracking fibers can play a good role in anti-cracking and strengthening, and the vitrified micro bubbles, the light ceramsite and the anti-cracking fibers are mixed with the micro-silica powder aluminate gelling agent and then are condensed together, so that the compressive strength, the hardness and the temperature resistance can be obviously improved, and the heat conductivity coefficient is lower.
2) The high-strength heat insulation pipe shell has the advantages of light weight, higher strength, lower heat conductivity coefficient and better vibration and crack resistance, and meets the requirements of long-distance heat distribution pipelines on high load, heat insulation, heat preservation, vibration and crack resistance and high reliability.
3) The high-strength heat-insulating pipe shell has the advantages of low cost, good process, simple and easy preparation method and easy industrial production.
4) The invention is used for the high-strength light heat-insulation pipe shell for the long-distance heat distribution pipeline conveying support pipe bracket.
Drawings
FIG. 1 is a schematic diagram of an exemplary implementation of the present invention;
in the figure: 1. a base; 2. high-strength heat insulation pipe shell; 3. a pipeline; 4. a ceramic fiber layer; 5. a layer of aluminium silicate fibres; 6. clamping a hoop; 7. and fastening the bolt assembly.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
The following examples are experimental methods without specifying specific conditions, according to conventional conditions.
Example 1
The preparation method of the high-strength heat insulation pipe shell comprises the following specific steps:
the vitrified micro bubbles, the light ceramsite, the micro silicon powder, the anti-crack fibers and the aluminate gelatinizing agent are mixed according to the weight percentage of 20: 45: 4: 3: 28, putting the mixture into a mixing container to be dry-mixed uniformly; then adding 65kg of water into the mixing container for wet mixing; placing the mixed mixture into a mould, vibrating by adopting a vibrating rod, and flattening the outer surface; the demoulding time is 12 hours, and the high-strength heat insulation and preservation pipe shell is formed after 7 days of stable solidification. The experiment determines that the thermal conductivity coefficient of the material is as follows: 0.17W/(m.K), compressive strength of 1.5MPa/cm2。
Example 2
The preparation method of the high-strength heat insulation pipe shell comprises the following specific steps:
the vitrified micro bubbles, the light ceramsite, the micro silicon powder, the anti-crack fibers and the aluminate gelling agent are mixed according to the weight percentage of 23: 44: 4: 3: 26 into a mixerDry mixing in a container; then adding 55kg of water into the mixing container for wet mixing; placing the mixed mixture into a mould, vibrating by adopting a vibrating rod, and flattening the outer surface; the demoulding time is 6 hours, and the high-strength heat insulation pipe shell is formed after 5 days of stable solidification. The experiment determines that the thermal conductivity coefficient of the material is as follows: 0.155W/(m.K), compressive strength of 1MPa/cm2。
The method is realized by adopting a prefabrication mode during implementation, and the required shape is manufactured by a mould according to the requirements of actual geometric dimension and performance parameters and can be used after being stably cured for a period of time.
The high-strength heat-insulation pipe shell is typically welded with the lower half part of a hoop 6 into a whole through a base 1, a ceramic fiber layer 4, a high-strength heat-insulation pipe shell 2, an aluminum silicate fiber layer 5 are arranged in the hoop 6, a pipeline 3 is arranged in the ceramic fiber layer 5, and the hoop is fixed 6 through a fastening bolt component 7.
According to the typical high-strength heat-insulation and heat-preservation pipe shell, the ceramic fiber layer 4 is arranged in the high-strength heat-insulation and heat-preservation pipe shell, the aluminum silicate fibers 5 are arranged outside the high-strength heat-insulation and heat-preservation pipe shell, so that the heat conductivity coefficient can be effectively reduced, the compensation effect on the manufacturing deviation of the hoop and the pipeline can be realized, the effective vibration reduction effect can be realized, and the accessories are added on the basis, so that the.
The invention mainly embodies the formula and the implementation process of the high-strength heat-insulation pipe shell, and other aspects are realized by the prior art.
In light of the foregoing description of preferred embodiments of the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. A high strength thermal-insulated heat preservation pipe shell which characterized in that: the ceramic tile is mainly prepared by mixing and solidifying vitrified micro bubbles, light ceramsite, micro silicon powder, anti-crack fibers and aluminate gelling agent by adopting machinery and a mould.
2. The high strength insulated pipe shell of claim 1, wherein: the weight percentages of the vitrified micro bubbles, the light ceramsite, the micro silicon powder, the anti-crack fibers and the aluminate gelling agent are 20-24: 40-45: 3-5: 3-4: 26-30.
3. A method for manufacturing a high-strength heat-insulating and heat-preserving shell as claimed in claim 1 or 2, characterized in that: the method comprises the following steps:
1) putting the vitrified micro bubbles, the light ceramsite, the micro silicon powder, the anti-crack fibers and the aluminate gelling agent into a mixing container according to the proportion, and dry-mixing uniformly;
2) adding water into the mixing container for wet mixing to obtain a mixture;
3) placing the mixture into a die, vibrating by a vibrating rod, and flattening the outer surface;
4) and after demolding, stably curing to form the high-strength heat-insulation pipe shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011620237.1A CN112608116A (en) | 2020-12-30 | 2020-12-30 | High-strength heat insulation pipe shell and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011620237.1A CN112608116A (en) | 2020-12-30 | 2020-12-30 | High-strength heat insulation pipe shell and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112608116A true CN112608116A (en) | 2021-04-06 |
Family
ID=75249510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011620237.1A Pending CN112608116A (en) | 2020-12-30 | 2020-12-30 | High-strength heat insulation pipe shell and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112608116A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182178A (en) * | 2007-11-29 | 2008-05-21 | 武汉莱克利安科技有限公司 | Special masonry mortar for self-insulating wall |
| CN101665343A (en) * | 2008-03-14 | 2010-03-10 | 湖北天泉新型建筑材料有限公司 | Vitrified micro-bead heat preserving and insulating material and method of preparing same |
| US20100276837A1 (en) * | 2009-04-29 | 2010-11-04 | Rada David C | Lightweight construction material and methods and device for fabrication thereof |
| CN103553687A (en) * | 2013-11-09 | 2014-02-05 | 宁夏天纵泓光余热发电技术有限公司 | Heat-insulating fireproof pouring material |
| CN103951350A (en) * | 2014-04-25 | 2014-07-30 | 中南大学 | Lightweight aggregate concrete for heat preservation of structures |
| KR101471146B1 (en) * | 2014-06-19 | 2014-12-15 | 주식회사 이에스피소재 | Absorbent-pervious cement mortar compositions and manufacturing method and construction method of pavement absorbent-pervious using the same |
| CN108675732A (en) * | 2018-06-27 | 2018-10-19 | 常州优纳新材料科技有限公司 | A kind of conduit saddle heat-insulating heat-preserving material and preparation method thereof |
| CN108793932A (en) * | 2018-07-18 | 2018-11-13 | 合肥帧讯低温科技有限公司 | A kind of thermal-insulation energy-conservation material and preparation method thereof |
-
2020
- 2020-12-30 CN CN202011620237.1A patent/CN112608116A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182178A (en) * | 2007-11-29 | 2008-05-21 | 武汉莱克利安科技有限公司 | Special masonry mortar for self-insulating wall |
| CN101665343A (en) * | 2008-03-14 | 2010-03-10 | 湖北天泉新型建筑材料有限公司 | Vitrified micro-bead heat preserving and insulating material and method of preparing same |
| US20100276837A1 (en) * | 2009-04-29 | 2010-11-04 | Rada David C | Lightweight construction material and methods and device for fabrication thereof |
| CN103553687A (en) * | 2013-11-09 | 2014-02-05 | 宁夏天纵泓光余热发电技术有限公司 | Heat-insulating fireproof pouring material |
| CN103951350A (en) * | 2014-04-25 | 2014-07-30 | 中南大学 | Lightweight aggregate concrete for heat preservation of structures |
| KR101471146B1 (en) * | 2014-06-19 | 2014-12-15 | 주식회사 이에스피소재 | Absorbent-pervious cement mortar compositions and manufacturing method and construction method of pavement absorbent-pervious using the same |
| CN108675732A (en) * | 2018-06-27 | 2018-10-19 | 常州优纳新材料科技有限公司 | A kind of conduit saddle heat-insulating heat-preserving material and preparation method thereof |
| CN108793932A (en) * | 2018-07-18 | 2018-11-13 | 合肥帧讯低温科技有限公司 | A kind of thermal-insulation energy-conservation material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110922095B (en) | Preparation method of composite silica aerogel felt | |
| CN107200530A (en) | A kind of preparation method of Phasochange energy storage ceramic particle and its application in fiber concrete structure | |
| CN107599273B (en) | Polymer reinforced prestressed steel cylinder concrete pipeline forming process | |
| CN102180625A (en) | Light aggregate concrete building block | |
| CN114075060A (en) | Die-pressing inorganic polystyrene particle insulation board and preparation method thereof | |
| CN113477926A (en) | Production process of high-performance ceramic lining composite steel pipe | |
| CN112608116A (en) | High-strength heat insulation pipe shell and preparation method thereof | |
| Li et al. | Study on mechanical properties of basalt fiber reinforced concrete | |
| CN205026310U (en) | Steam low energy consumption long distance transportation device | |
| CN106588082A (en) | Autoclaved aerated concrete block doped with phase change polypropylene fiber and preparation method of autoclaved aerated concrete block | |
| CN108071173B (en) | Construction method of mass concrete | |
| CN102432319B (en) | Nanometer super insulating board suitable for high temperature metallurgical container and manufacturing method thereof | |
| CN102503499B (en) | Inorganic non-metal compound material for heating system and preparation method thereof | |
| KR100729215B1 (en) | Ceramic lining for pipe using high-speed centrifugal thermit reactor and lined layer's properties | |
| CN108164243A (en) | Alumina silicate fibre is mostly used food electromagnetic heating heat preservation sleeve | |
| CN108383479A (en) | A kind of heat-insulating material and preparation method thereof for Cryo Heat Insulation pipeline | |
| CN104830262A (en) | Heat-resistant epoxy adhesive for non-excavation rehabilitation technology and preparation method of heat-resistant epoxy adhesive | |
| CN108675732A (en) | A kind of conduit saddle heat-insulating heat-preserving material and preparation method thereof | |
| CN115010457A (en) | Superfine ceramic fiber cotton thermal insulation pipe shell and preparation method thereof | |
| CN115716734A (en) | Anti-cracking corrosion-resistant type ultrahigh-performance concrete with thixotropy and preparation method thereof | |
| CN203147166U (en) | Thermal-bridge-transfer-preventive sliding support seat of 150 DEG C heating overhead pipeline | |
| JP7449701B2 (en) | Geopolymer-like cured body | |
| CN115219325A (en) | Production method and test method for prefabricated ultrahigh-strength concrete foundation of transmission tower | |
| CN107879663A (en) | A kind of flexible compound silicate warming plate material and preparation method | |
| CN203147178U (en) | Sliding support arranged on 350 DEG C heat supply overhead pipeline and used for preventing heat bridge from transferring heat |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210406 |