CN116336266A - Prefabricated overhead heat-insulating pipe with tile-cotton-foam composite structure and manufacturing method thereof - Google Patents

Prefabricated overhead heat-insulating pipe with tile-cotton-foam composite structure and manufacturing method thereof Download PDF

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Publication number
CN116336266A
CN116336266A CN202310398573.3A CN202310398573A CN116336266A CN 116336266 A CN116336266 A CN 116336266A CN 202310398573 A CN202310398573 A CN 202310398573A CN 116336266 A CN116336266 A CN 116336266A
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China
Prior art keywords
heat
insulating
layer
tile
pipe
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Pending
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CN202310398573.3A
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Chinese (zh)
Inventor
邵卫松
毛扬
黄振西
肖立洪
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Jiangsu Zhongyang Pipe Industry Co ltd
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Jiangsu Zhongyang Pipe Industry Co ltd
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Priority to CN202310398573.3A priority Critical patent/CN116336266A/en
Publication of CN116336266A publication Critical patent/CN116336266A/en
Pending legal-status Critical Current

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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
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • 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
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • 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
    • F16L59/028—Composition or method of fixing a thermally insulating material
    • 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
    • F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Insulation (AREA)

Abstract

The invention relates to a prefabricated overhead heat-insulating pipe with a tile-cotton-foam composite structure and a manufacturing method thereof. The heat-insulating composite structure is characterized in that an inner lining layer is wrapped outside the steel pipe, a reflecting layer is wrapped outside the inner lining layer, a tile-cotton composite structure is arranged outside the reflecting layer, the structure is formed by alternately connecting a hard heat-insulating material (microporous calcium silicate tile) and a soft heat-insulating material (aluminum silicate cotton), and the total number of the heat-insulating layers of the tile-cotton composite structure is two, and the heat-insulating layers are staggered. The prefabricated heat-insulating pipe adopts a composite heat-insulating structure, the soft heat-insulating section is positioned between the two hard heat-insulating sections, so that a heat leakage gap generated by heating and non-directional shrinkage of calcium silicate can be greatly reduced, and the prefabricated heat-insulating pipe has good heat-insulating performance. The hard heat-insulating sections have stronger strength, and the hard heat-insulating sections are connected in a staggered way, so that the composite heat-insulating layer has certain compressive strength. Meanwhile, the two composite heat-insulating layers are arranged in a staggered manner, so that the heat-insulating structure has good internal uniformity. The prefabricated overhead heat-insulating pipe is applied to the field of prefabricated overhead steam conveying, so that the total construction cost of engineering can be reduced, and meanwhile, heat energy is saved.

Description

Prefabricated overhead heat-insulating pipe with tile-cotton-foam composite structure and manufacturing method thereof
Technical Field
The invention relates to a prefabricated heat-insulating pipe technology, in particular to a heat-insulating pipe heat-insulating technology special for high heat transfer capacity, which is suitable for high heat-insulating requirements.
Background
With the high-speed development of economy in recent years, the increasingly serious environmental problem becomes a difficult problem to be solved in China and even the world. In order to protect the environment, emission reduction and energy conservation gradually enter the field of vision of people. The pipe network transportation is one of the main modes of heat transportation, so that the heat loss in the pipe network transportation process can be reduced, energy sources can be greatly saved, and the heat preservation pipeline is an effective and reasonable method. The traditional heat preservation adopts a construction method of on-site laying, but the on-site construction condition is poor, the operation difficulty is high, the time and the labor are consumed, the management difficulty of the construction standard and the requirement is high, and meanwhile, the problem of poor heat preservation performance of the pipeline is caused.
Currently, the technology of prefabricating the heat-insulating pipes is popular in the market, namely a novel technology for realizing controllable management of heat-insulating quality through prefabrication of finished products. The common prefabricated heat preservation pipes mainly comprise soft material prefabricated heat preservation pipes and hard material prefabricated heat preservation pipes. The soft heat insulating material has the main advantages of good heat insulating performance, but has the main defects of poor compression resistance, easy deformation caused by external force, easy sagging phenomenon after long-time use, thin upper part and thick lower part of the heat insulating layer, and reduced heat insulating performance. The hard heat insulating material solves the problems that the soft heat insulating material is easy to collapse and not resistant to compression, and has good stability in a high-temperature environment. However, gaps exist between the block structures of the calcium silicate, even if caulking filling is completed during cold state installation, the gaps between the blocks can be enlarged due to the influence of thermal expansion and cold contraction in the thermal state operation process, heat leakage of the gaps is increased, and the overall heat insulation performance of the heat insulation structure is reduced.
In view of the above, the conventional heat preservation technology and the prefabricated heat preservation pipe technology have certain defects, and in order to enhance the heat preservation performance and improve the pipe network transportation efficiency, a novel prefabricated overhead heat preservation pipe technology is provided.
Disclosure of Invention
The invention aims to provide a prefabricated overhead heat-insulating pipe with a tile-cotton-foam composite structure, which comprises two layers of tile-cotton composite heat-insulating layers, wherein each layer of composite heat-insulating layer is formed by alternately connecting a hard heat-insulating section and a soft heat-insulating section. The hard heat preservation section has certain heat preservation performance and high strength, and can bear the running load of a heat supply network; the soft heat preservation section has good heat preservation performance and can effectively prevent heat loss. The hard heat preservation sections and the soft heat preservation sections are connected in a staggered manner, the soft heat preservation sections are positioned between the two hard heat preservation sections, so that heat leakage gaps generated by non-directional shrinkage of calcium silicate after being heated can be greatly reduced, and the heat preservation device has good heat preservation performance. The hard heat-insulating material has high strength, so that the hard heat-insulating sections are alternately connected to form a tile-cotton composite structure, and the good integral strength can be ensured. The two composite heat-insulating layers are arranged in a staggered manner, so that the uniformity of the heat-insulating layers can be effectively improved. The jacket layer is arranged outside the second layer of composite heat insulation layer, so that the soft heat insulation section can be protected from being influenced by pressure in the external foaming process. Annular supporting structures are uniformly arranged outside the hard heat preservation section and the soft heat preservation section, so that the organic heat preservation layer is not eccentric and does not collapse.
The invention aims at realizing the following technical scheme:
a prefabricated overhead heat-insulating pipe with a tile-cotton-foam composite structure comprises a working steel pipe, an inner liner, a heat-insulating layer with a tile-cotton-foam composite structure, a reflecting layer, an outer protective pipe and the like; the prefabricated heat-insulating pipe is characterized in that an inner lining layer is wrapped outside the steel pipe, a reflecting layer is wrapped outside the inner lining layer, a tile-cotton composite structure is arranged outside the reflecting layer, the structure is formed by laminating a composite heat-insulating layer formed by alternately connecting a hard heat-insulating material (microporous calcium silicate tile) and a soft heat-insulating material (aluminum silicate cotton), the total number of the heat-insulating layers of the tile-cotton composite structure is two, and the two layers are arranged in a staggered manner. An organic heat-insulating layer is arranged outside the heat-insulating layer of the composite structure, and a metal outer protective tube is sleeved outside the organic heat-insulating layer.
The design of the prefabricated heat-insulating pipeline adopts three heat-insulating materials, namely aluminum silicate cotton, microporous calcium silicate tile and polyurethane foam, wherein the aluminum silicate cotton is a soft heat-insulating material, can effectively fill the gap between the dimensional tolerance of a round steel pipe and a hard calcium silicate heat-insulating layer, reduces heat dissipation loss, effectively reduces the temperature of the calcium silicate layer, and has the lowest heat conductivity coefficient in the common heat-insulating material, and the heat conductivity coefficient during heat insulation is only 0.03W/(m.K). The calcium silicate heat-insulating material has high strength and can be combined with the external polyurethane layer to effectively support the internal working pipe. The three heat insulation materials are combined, so that complementary advantages can be realized, and the performance of the prefabricated heat insulation pipe product can be optimized.
The aluminium silicate needle cotton is a heat-insulating refractory material which is formed by taking aluminium silicate as a raw material and adopting a resistance furnace process and by special needling of aluminium silicate long fibers. Has the advantages of good extensibility, strong shock resistance, white color, regular size and the like. The performance parameters are as follows: the maximum use temperature is 1000 ℃, the common heat conductivity coefficient lambda is less than or equal to 0.044W/(m.K) @70 ℃, and the density is 128kg/m 3 。
The microporous calcium silicate product is produced with hard calcium stone hydrate, reinforcing fiber and other material and through mixing, molding and high temperature oxygen steaming process. The performance parameters are as follows: the density is 170 Kg/m to 240Kg/m 3 The heat conductivity coefficient is 0.058W/(m.K) (650 ℃) and the compressive strength is more than or equal to 0.7MPa and the flexural strength is more than or equal to 0.4MPa. The product has the advantages of high heat resistance, good heat insulation performance, high strength, good durability, corrosion resistance, no pollution and the like.
Rigid polyurethane foam (PUR) is a foam that uses polyurethane as a raw material. The performance parameters are as follows: density of 55-65 kg/m 3 The heat conductivity coefficient is lower than 0.027W/(m.K) (the working temperature is less than or equal to 100 ℃), the compressive strength is more than or equal to 0.22MPa, the oxygen index is 28%, and the single-layer thickness is 10-35 mm. Among the heat insulating materials existing up to now, the heat conductivity coefficient of the product is basically the lowest, and the product has certain compressive strength, is not easy to burn and has good chemical stability.
The aluminum foil glass fiber cloth is used as a material of the reflecting layer of the heat preservation pipe. The aluminum foil glass fiber cloth takes pure aluminum foil as a base material, is uniformly coated with high-temperature-resistant special adhesive, and has smooth and flat surface, high light reflectivity, high tensile strength, good primary adhesion, excellent cohesive force, high temperature resistance, good sealing performance and fire resistance grade: flame spread "0" level, surface spread "1" level. The physical parameters are as follows: peel strength >12.5N/25mm, and the holding power >27 hours has no displacement; the thickness of the aluminum foil is 15-20um, and the reflectivity is more than 1.
In order to ensure that the central line of the outer sleeve is consistent with that of the working tube, the thickness of the polyurethane layer is uniform around the circumference, 4-6 groups of support rings are uniformly distributed in the axial direction of the heat insulation tube before the spiral tube is sheathed outside the sleeve, and 6-8 support blocks are uniformly distributed in each group of support rings.
The spiral air pipe is made of the material of the outer protective layer. The spiral air duct is made of galvanized iron sheets, galvanized plates, aluminized steel plates and the like through a metal engagement machine, the plate thickness is 0.5-1.2 mm, the plate width is 115-145 mm, the engagement width is 10-14 mm, the engagement gap is compact, the width is consistent, the length of the spiral pipe is adjustable, the pipe diameter of the spiral pipe is adjustable, and the color of the spiral pipe is kept consistent with that of the outer protective layer of the prefabricated heat preservation straight pipe section as much as possible. The spiral air pipe is used as the outer protective layer, and has stable and reliable quality, strong anti-compression capability, firm seaming, high strength and strong sealing performance.
In the foaming process of the organic heat-insulating layer, the environment temperature should be reasonably controlled. The foaming temperature is too low, the chemical reaction of raw materials is slow, the molding and curing time of the foam is long, and the processing time and the efficiency of the heat preservation pipe are low; the foaming temperature is too high, the reaction speed of the raw materials is high, the material liquid is solidified after being fully diffused in the sleeve, and the generated foam is uneven. Therefore, in the foaming process, the temperature of the raw materials should be controlled between 20 and 25 ℃, so that polyurethane foam with excellent performance can be prepared.
The beneficial effects of the invention are as follows:
the prefabricated overhead heat-insulating pipe with the tile-cotton-foam composite structure and the manufacturing method thereof adopt a composite heat-insulating structure, the hard heat-insulating sections and the soft heat-insulating sections are connected in a staggered manner, the soft heat-insulating sections are positioned between the two hard heat-insulating sections, and heat leakage gaps generated by non-directional shrinkage of calcium silicate after being heated can be greatly reduced, so that the prefabricated overhead heat-insulating pipe has good heat-insulating performance. The hard heat-insulating sections have stronger strength, and the hard heat-insulating sections are connected in a staggered way, so that the composite heat-insulating layer has certain compressive strength. Meanwhile, the two composite heat-insulating layers are arranged in a staggered manner, so that the heat-insulating structure has good internal uniformity. The organic heat-insulating layer adopts polyurethane foam, and the heat conductivity coefficient of the material is only 0.03W/(m.K). The calcium silicate heat-insulating material is combined with the outer polyurethane layer, so that the inner working tube can be effectively supported. The prefabricated overhead heat-insulating pipe is applied to the field of prefabricated overhead steam conveying, so that the total construction cost of engineering can be reduced, and meanwhile, heat energy is saved.
Drawings
FIG. 1 is a schematic view of the structure of a prefabricated insulating tube;
FIG. 2 is a schematic view of the longitudinal interface of the outer soft insulation section of the inner hard insulation section;
FIG. 3 is a schematic view of the longitudinal interface of the outer layer of the inner layer soft insulation section and the outer layer hard insulation section;
in the figure: 1-a steel pipe; 2-an inner liner layer; 3-a hard heat-insulating layer; 4, a soft heat preservation layer; 5-an organic heat-insulating layer; 6-supporting in a circumferential direction; 7-a reflective layer; 8-jacket layer; 9-an outer protective tube.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
As shown in figure 1, the prefabricated overhead heat-insulating pipe consists of nine structures including a steel pipe, an inner lining layer, a tile-cotton composite structure heat-insulating layer, an organic heat-insulating layer, a reflecting layer, a jacket layer, a circumferential support, an outer protective pipe and the like. The steel pipe 1 is subjected to surface treatment, and then the outer surface of the steel pipe is wrapped with an inner lining layer 2, the inner lining layer 2 is made of an aluminum silicate needled blanket heat-insulating material, and a reflecting layer 7 made of aluminum foil glass fiber cloth is arranged outside the aluminum silicate needled blanket heat-insulating material; 2 layers of heat-insulating layers with tile-cotton composite structures are arranged outside the reflecting layer 7, and each layer of heat-insulating layer with the tile-cotton composite structure is formed by alternately connecting a hard heat-insulating section 3 and a soft heat-insulating section 4. The hard heat preservation section 3 is formed by splicing microporous calcium silicate tiles, and the length of each section is 60cm; the soft heat preservation section 4 adopts high temperature resistant superfine glass wool heat preservation materials, the length of each section is 30cm, and the thickness of each layer of superfine glass wool is about 40mm. Each layer of superfine glass wool is wrapped with a reflecting layer; a jacket layer 8 is sleeved outside the heat-insulating layer with the 2 nd layer tile-cotton composite structure, and the jacket layer 8 is a metal pipe which is formed by rolling white iron sheets; the outer diameter of the jacket layer 8 is kept the same as the outer diameter of the heat-insulating layer with the composite structure, the outer protective tube 9 is sleeved outside the jacket layer 7, and the outer protective tube 9 is a sealed spiral air tube which is formed by rolling stainless steel, galvanized iron sheets, color steel plates and the like; the annular support 6 is arranged in the cavity between the outer protective tube 9 and the inner jacket layer 8 at intervals, and the annular support structure 6 is formed by cutting high-density polyurethane; then injecting foaming material of the organic heat-insulating layer 5 into the cavity, wherein the material of the organic heat-insulating layer 5 is polyurethane hard foam; the polyurethane foam can tightly wrap the internal insulation structure so that the prefabricated insulation pipe has certain overall strength.
The prefabricated heat preservation pipe processing technology comprises the following steps:
steel pipe surface treatment, aluminum silicate needle blanket wrapping, calcium silicate tile wrapping, spiral outer sleeve sleeving, polyurethane foam filling and packaging.
The specific implementation steps are as follows:
1) Carrying out surface treatment on the working steel pipe, removing burrs and dust;
2) Wrapping an aluminum silicate needled blanket, cutting the aluminum silicate needled blanket, binding the aluminum silicate needled blanket on the surface of a working pipe by using galvanized steel belts, wherein the length of each section is 30cm, the interval between each section is 60cm, and each section is bound with one steel belt at a position 2-5 cm away from the edge. Note that the longitudinal seam and the circumferential seam of the aluminum silicate blanket are to be staggered and overlapped, two sides of the overlapped part are cut into 45 degrees, and the longitudinal seam cannot be arranged on the pipe within the range of 60 degrees;
3) Wrapping the inner layer calcium silicate tiles, and wrapping the inner layer calcium silicate tiles in the gaps of the wrapped aluminum silicate needled blanket, wherein each section is 60cm in length. The galvanized steel strip is tightly bound at the position 2-5 cm away from the edge and the middle point of each section, the longitudinal circular seam needs to be staggered, and the longitudinal circular seam is staggered with the inner layer material seam; wrapping the outer layer calcium silicate tiles in the same way, and simultaneously paying attention to the fact that each section of calcium silicate tiles in the inner layer and the outer layer are longitudinally staggered, and pushing the whole construction process from one end to the other end from inside to outside;
4) The spiral outer protective tube is fixed on the working tube by using threading sleeve equipment, 4-6 groups of support rings are uniformly arranged in the axial direction of the heat preservation tube, 6-8 support blocks are uniformly distributed on each group of support rings, end seals are added at two ends of each support ring, the support rings are fixed by using thermoplastic sleeves, and the inner space is kept airtight;
5) Injecting polyurethane foam into the cavity of the heat-insulating pipe from the foaming holes by using a high-pressure foaming machine, and controllingThe density of foam is 50+ -5 kg/m 3 The left and right sides, the material injection opening is closed after the material injection is finished;
6) Waiting for curing for 30min;
7) Sealing the two ends of the cured heat preservation pipe, and properly preserving.
The foregoing is only one embodiment of the invention, and all changes, equivalents, modifications and variations that come within the spirit and scope of the invention are desired to be protected.

Claims (6)

1. A prefabricated overhead heat-insulating pipe with a tile-cotton-foam composite structure and a manufacturing method thereof comprise the structures of a working steel pipe, an inner liner layer, a heat-insulating layer with a tile-cotton composite structure, a reflecting layer, an outer protecting pipe and the like. The heat-insulating composite structure is characterized in that an inner lining layer is wrapped outside the steel pipe, a reflecting layer is wrapped outside the inner lining layer, a tile-cotton composite structure is arranged outside the reflecting layer, the structure is formed by alternately connecting a hard heat-insulating material (microporous calcium silicate tile) and a soft heat-insulating material (aluminum silicate cotton) to form a composite heat-insulating layer, the total number of the heat-insulating layers of the tile-cotton composite structure is two, and the two heat-insulating layers are staggered. The composite structure heat-insulating layer is externally and uniformly provided with a circumferential support structure, a metal outer protection pipe is sleeved outside the circumferential support structure, and an organic heat-insulating layer is arranged in a cavity between the heat-insulating layer and the external metal outer protection pipe.
2. The prefabricated overhead heat-insulating pipe with the tile-cotton-foam composite structure and the manufacturing method thereof according to claim 1, wherein the heat-insulating layer with the tile-cotton composite structure comprises soft heat-insulating sections and hard heat-insulating sections, the soft heat-insulating sections and the hard heat-insulating sections are alternately connected, each section of the soft heat-insulating sections is 30cm long, each section of the hard heat-insulating sections is 60cm long, and the total heat-insulating thickness of the hard heat-insulating sections is the same as the total heat-insulating thickness of the soft heat-insulating sections.
3. The prefabricated overhead heat-insulating pipe with the tile-cotton-foam composite structure and the manufacturing method thereof, which are disclosed in claim 1, are characterized in that the tile-cotton composite structure heat-insulating layer has two layers, and the two layers of soft heat-insulating sections and the hard heat-insulating sections are staggered and overlapped, so that the heat-insulating performance of the heat-insulating layer and the strength of the heat-insulating material are integrally and uniformly ensured. A jacket layer is arranged outside the second composite heat-insulating layer, and the jacket layer is made of iron scales with the thickness of 0.4-2 mm. The jacket layer is evenly provided with a circumferential support structure, the circumferential support is wrapped by an organic heat-insulating layer, and the organic heat-insulating layer is made of polyurethane foam.
4. The prefabricated overhead heat-insulating pipe with the tile-cotton-foam composite structure and the manufacturing method thereof according to claim 1, wherein the hard heat-insulating section comprises a microporous calcium silicate heat-insulating material. The microporous calcium silicate is in a tube shell shape, the tube shell is formed by splicing 4-8 pieces of calcium silicate tiles, the length of each section is 60cm, the single-layer thickness of the microporous calcium silicate heat insulation material is 50-100 mm, the total heat insulation thickness of the hard heat insulation section is the same as that of the soft heat insulation section, and the outer part of each layer of microporous calcium silicate tube shell is provided with a reflecting layer structure.
5. The prefabricated overhead heat-insulating pipe with the tile-cotton-foam composite structure and the manufacturing method thereof according to claim 1, wherein the annular supporting structure is made of hard polyurethane material. In order to ensure that the central line of the outer sleeve is consistent with that of the working tube, the thickness of the polyurethane layer is uniform around the circumference, 4-6 groups of support rings are uniformly distributed in the axial direction of the heat insulation tube before the spiral tube is sheathed outside the sleeve, and 6-8 support blocks are uniformly distributed in each group of support rings.
6. The prefabricated overhead insulating pipe system of claim 1, wherein the outer protective pipe is a thin-walled spiral pipe formed by mechanically engaging metal sheets such as galvanized iron sheets, thin aluminum sheets or stainless steel sheets. Each spiral outer protection tube is 5m long, each prefabricated tube needs two spiral outer protection tubes, the joint of the two spiral outer protection tubes is overlapped by 5cm, the two spiral outer protection tubes are connected in a direct inserting mode, rivets are fixed, and the joint is sealed.
CN202310398573.3A 2023-04-14 2023-04-14 Prefabricated overhead heat-insulating pipe with tile-cotton-foam composite structure and manufacturing method thereof Pending CN116336266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310398573.3A CN116336266A (en) 2023-04-14 2023-04-14 Prefabricated overhead heat-insulating pipe with tile-cotton-foam composite structure and manufacturing method thereof

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Application Number Priority Date Filing Date Title
CN202310398573.3A CN116336266A (en) 2023-04-14 2023-04-14 Prefabricated overhead heat-insulating pipe with tile-cotton-foam composite structure and manufacturing method thereof

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Publication Number Publication Date
CN116336266A true CN116336266A (en) 2023-06-27

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Country Status (1)

Country Link
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