CN215172872U - High-temperature anti-corrosion prefabricated direct-buried heat-insulation pipe - Google Patents
High-temperature anti-corrosion prefabricated direct-buried heat-insulation pipe Download PDFInfo
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- CN215172872U CN215172872U CN202121402447.3U CN202121402447U CN215172872U CN 215172872 U CN215172872 U CN 215172872U CN 202121402447 U CN202121402447 U CN 202121402447U CN 215172872 U CN215172872 U CN 215172872U
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- insulating
- steel pipe
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- 238000005260 corrosion Methods 0.000 title claims abstract description 16
- 238000009413 insulation Methods 0.000 title claims description 30
- 239000010410 layer Substances 0.000 claims abstract description 74
- 239000004814 polyurethane Substances 0.000 claims abstract description 30
- 229920002635 polyurethane Polymers 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 239000011241 protective layer Substances 0.000 claims abstract description 11
- 239000011229 interlayer Substances 0.000 claims abstract description 10
- 238000004321 preservation Methods 0.000 claims description 15
- 230000003139 buffering effect Effects 0.000 claims description 8
- 239000004964 aerogel Substances 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 6
- 239000011490 mineral wool Substances 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 2
- 238000009933 burial Methods 0.000 claims 1
- 230000001681 protective effect Effects 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
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Abstract
The utility model discloses a high-temperature anti-corrosion prefabricated direct-buried heat-insulating pipe, which comprises a working steel pipe, wherein the inner wall of the working steel pipe is coated with an anti-corrosion coating, the outer side of the working steel pipe is provided with a heat-insulating layer, the outer side of the heat-insulating layer is wrapped with a hard polyurethane layer, the outer side of the hard polyurethane layer is sleeved with a metal protective layer, a vacuum interlayer is formed between the metal protective layer and the hard polyurethane layer, and the metal protective layer and the hard polyurethane layer are fixed through a connecting rib; the outer side of the metal protective layer is wrapped with a buffer heat-insulating layer, and the outer side of the buffer heat-insulating layer is wrapped with an outer protective pipe; the utility model provides high prefabricated direct-burried insulating tube keeps warm, the anticorrosive performance, under ultra-high temperature service condition, can prolong the life of insulating tube.
Description
Technical Field
The utility model relates to a thermal insulation pipe specifically is a anticorrosive prefabricated direct-burried thermal insulation pipe of high temperature.
Background
At present, rigid polyurethane is generally adopted as a heat insulation material in a direct-buried heat insulation pipe in the heat supply industry; the structure of the heat preservation pipe popular in the market is as follows: the inner layer is a working steel pipe, the middle layer is a polyurethane heat-insulating layer, and the outer layer is a high-density polyethylene outer protective pipe. Although the heat preservation effect of the heat preservation pipe is good, the heat preservation pipe also has certain disadvantages: due to the limitation of the structure and the heat-insulating material, the maximum use temperature of the heat-insulating pipe for a long time is always limited, and the phenomenon that a polyurethane heat-insulating layer is carbonized due to high temperature often occurs; another reason for the carbonization of the insulation layer is: because the temperature of water in the underground pipe network is low before heating, the condensation phenomenon can be generated outside the steel pipe, when the temperature of water conveyed in the heat-insulating pipe exceeds 100 ℃, water drops outside the steel pipe can be vaporized, the pressure in the heat-insulating layer is increased, the protective shell is broken, the heat-insulating layer is carbonized, and the heat-insulating effect and the service life are influenced; for steam with temperature of 170-350 ℃, the rigid polyurethane heat-insulating pipe cannot be used at all; and the working steel pipe is in high-temperature liquid for a long time, is easy to be corroded and oxidized, the inner surface is rusted, and the service life of the heat-insulating pipe is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's is not enough, provides an anticorrosive prefabricated direct-burried insulating tube of high temperature to improve the thermal insulation performance and the corrosion resisting property of current prefabricated direct-burried insulating tube.
In order to achieve the above purpose, the present invention is achieved by the following technical solutions.
A high-temperature anti-corrosion prefabricated direct-buried heat insulation pipe comprises a working steel pipe, wherein an anti-corrosion coating is coated on the inner wall of the working steel pipe, a heat insulation layer is arranged on the outer side of the working steel pipe, a hard polyurethane layer wraps the outer side of the heat insulation layer, a metal protection layer is sleeved on the outer side of the hard polyurethane layer, a vacuum interlayer is formed between the metal protection layer and the hard polyurethane layer, and the metal protection layer and the hard polyurethane layer are fixed through a connecting rib; the metal protective layer outside parcel has the buffering heat preservation, the buffering heat preservation outside parcel has outer pillar.
Furthermore, a heat-insulating anti-corrosion coating is arranged in front of the working steel pipe and the heat-insulating layer.
Furthermore, the heat-insulating layer is a rock wool heat-insulating layer or a composite heat-insulating layer of polyurethane and aerogel felt.
Furthermore, the buffer heat-insulation layer is a polyethylene foam layer.
The utility model discloses produced beneficial effect for prior art does:
the utility model discloses owing to set up anticorrosive coating in work steel pipe inboard, avoid the steel pipe to be corroded, prolong the life of steel pipe. The vacuum interlayer formed after the metal protective layer and the hard polyurethane layer are sleeved is arranged outside the heat-insulating layer, so that the heat-insulating property of the heat-insulating pipe is improved, and meanwhile, the problem of pressure increase of the heat-insulating layer caused by evaporation of water drops outside the pipe is relieved by combining the vacuum interlayer with the buffer heat-insulating layer arranged outside the metal protective layer.
In the optimized structure, a heat-insulating anti-corrosion coating is additionally arranged between the working steel pipe and the heat-insulating layer, so that the heat-insulating and anti-corrosion performances are improved, and the service life of the heat-insulating pipe can be prolonged under the ultra-high temperature use condition.
Drawings
Fig. 1 is a schematic structural view of a direct-buried heat-insulating pipe described in embodiment 1.
Fig. 2 is a schematic structural view of the direct-buried heat-insulating pipe described in embodiment 2.
In the figure, 1 is a working steel pipe; 2 is an anticorrosive coating; 3 is a hard polyurethane layer; 4 is a metal protective layer; 5 is a vacuum interlayer, 6 is a connecting rib, 7 is a buffer heat-insulating layer, 8 is an outer protective pipe, 9 is a heat-insulating anticorrosive coating, 10 is a rock wool heat-insulating layer, and 11 is a composite heat-insulating layer of polyurethane and aerogel felt.
Detailed Description
In order to make the technical problem, technical scheme and beneficial effect that the utility model will solve more clearly understand, combine embodiment and attached drawing, it is right to go on further detailed description the utility model discloses. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
Example 1
As shown in fig. 1, the prefabricated high-temperature anticorrosion direct-buried heat-insulating pipe comprises a working steel pipe 1, wherein an anticorrosion coating 2 is coated on the inner wall of the working steel pipe 1, and the anticorrosion coating 2 is made of an epoxy resin anticorrosion coating; the outer side of the working steel pipe 1 is wrapped with a composite heat insulation layer 11 of polyurethane and aerogel felt, the outer side of the composite heat insulation layer 11 of the polyurethane and aerogel felt is wrapped with a hard polyurethane layer 3, the outer side of the hard polyurethane layer 3 is sleeved with a metal protection layer 4, a vacuum interlayer 5 is formed between the metal protection layer 4 and the hard polyurethane layer 3, and the metal protection layer 4 and the hard polyurethane layer 3 are fixedly connected through a plurality of connecting ribs 6 made of metal materials; the outer side of the metal protective layer 4 is wrapped with a buffer heat-insulating layer 7 formed by polyethylene foaming, and the outer side of the buffer heat-insulating layer 7 is wrapped with an outer protective pipe 8 made of polyethylene. Wherein the thickness of the aerogel felt in the composite heat-insulating layer 11 of the polyurethane and the aerogel felt is 10mm, and the thickness of the polyurethane is 30 mm.
Example 2
As shown in fig. 2, the prefabricated high-temperature anticorrosion direct-buried thermal insulation pipe is also a high-temperature anticorrosion prefabricated direct-buried thermal insulation pipe, and is different from the embodiment 1 in that a thermal insulation anticorrosion coating 9 is arranged in front of the working steel pipe 1 and the thermal insulation layer. The heat-insulating and corrosion-resistant coating 9 adopts ZS-111 waterproof, corrosion-resistant, heat-insulating and heat-preserving coating, and is purchased from Beijing Zhi Shengweihua chemical Co., Ltd. In addition, the heat preservation layer is rock wool heat preservation layer 10, wraps up with rock wool annularly outside working steel pipe 1, forms rock wool heat preservation layer 10.
The prefabricated direct-buried heat preservation pipe in the embodiments 1 and 2 is provided with the anticorrosive coating on the inner side of the working steel pipe, so that the steel pipe is prevented from being corroded, and the service life of the steel pipe is prolonged. Set up the vacuum interlayer that forms after cup jointing by metal inoxidizing coating and rigid polyurethane layer outside the insulating layer, improved the thermal insulation performance of insulating tube, vacuum interlayer has buffering and heat retaining effect with the buffering heat preservation that sets up outside the metal protective layer concurrently simultaneously, and the problem of the heat preservation pressure increase because the evaporation of outer pipe drop of water has been alleviated with buffering heat preservation to vacuum interlayer makes up.
In the embodiment 2, the heat-insulating and corrosion-resistant coating is additionally arranged between the working steel pipe and the heat-insulating layer, so that the heat-insulating and corrosion-resistant performances are improved, and the service life of the heat-insulating pipe can be prolonged under the ultra-high temperature use condition.
The above description is for further details of the present invention with reference to specific preferred embodiments, and it should not be understood that the embodiments of the present invention are limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in a plurality of simple deductions or substitutions without departing from the scope of the present invention, and all such alterations and substitutions should be considered as belonging to the present invention, which is defined by the appended claims.
Claims (4)
1. The high-temperature anti-corrosion prefabricated directly-buried heat insulation pipe comprises a working steel pipe (1), and is characterized in that an anti-corrosion coating (2) is coated on the inner wall of the working steel pipe (1), a heat insulation layer is arranged on the outer side of the working steel pipe (1), a hard polyurethane layer (3) is wrapped on the outer side of the heat insulation layer, a metal protection layer (4) is sleeved on the outer side of the hard polyurethane layer (3), a vacuum interlayer (5) is formed between the metal protection layer (4) and the hard polyurethane layer (3), and the metal protection layer (4) and the hard polyurethane layer (3) are fixed through a connecting rib (6); the metal protective layer (4) outside parcel has buffering heat preservation (7), buffering heat preservation (7) outside parcel has outer pillar (8).
2. The prefabricated high-temperature anticorrosion direct-buried heat-insulation pipe as claimed in claim 1, wherein a heat-insulation anticorrosion coating (9) is arranged in front of the working steel pipe (1) and the heat-insulation layer.
3. The high-temperature anticorrosion prefabricated direct-burial thermal insulation pipe as claimed in claim 1, wherein the thermal insulation layer is a rock wool thermal insulation layer (10) or a composite thermal insulation layer (11) of polyurethane and aerogel felt.
4. The high-temperature anticorrosion prefabricated direct-buried heat-insulation pipe as claimed in claim 1, wherein the buffering heat-insulation layer (7) is a polyethylene foam layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121402447.3U CN215172872U (en) | 2021-06-23 | 2021-06-23 | High-temperature anti-corrosion prefabricated direct-buried heat-insulation pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121402447.3U CN215172872U (en) | 2021-06-23 | 2021-06-23 | High-temperature anti-corrosion prefabricated direct-buried heat-insulation pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215172872U true CN215172872U (en) | 2021-12-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121402447.3U Active CN215172872U (en) | 2021-06-23 | 2021-06-23 | High-temperature anti-corrosion prefabricated direct-buried heat-insulation pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215172872U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623322A (en) * | 2022-04-01 | 2022-06-14 | 西安热工研究院有限公司 | Aerogel heat insulation structure for heat preservation of hot gas conduit |
-
2021
- 2021-06-23 CN CN202121402447.3U patent/CN215172872U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623322A (en) * | 2022-04-01 | 2022-06-14 | 西安热工研究院有限公司 | Aerogel heat insulation structure for heat preservation of hot gas conduit |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231018 Address after: 041500 Qiaozigou Village, Xincheng Town, Xiangfen County, Linfen City, Shanxi Province (Xiangfen Economic and Technological Development Zone High end Equipment Manufacturing Park) Patentee after: Shanxi Liyuan Zhongtian Energy Saving Technology Co.,Ltd. Address before: 041500 west of Zhaodian village, Xiangfen County, Linfen City, Shanxi Province Patentee before: Shanxi Liyuan Zhongtian thermal insulation and anti-corrosion Engineering Co.,Ltd. |
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| TR01 | Transfer of patent right |