CN211875334U - Lightweight ultralow temperature resistant flexible composite pipe - Google Patents
Lightweight ultralow temperature resistant flexible composite pipe Download PDFInfo
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- CN211875334U CN211875334U CN202020308231.XU CN202020308231U CN211875334U CN 211875334 U CN211875334 U CN 211875334U CN 202020308231 U CN202020308231 U CN 202020308231U CN 211875334 U CN211875334 U CN 211875334U
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Abstract
The invention belongs to the technical field of reinforced composite pipes, and particularly relates to a lightweight ultralow temperature resistant flexible composite pipe which is particularly suitable for conveying ultralow temperature media such as Liquefied Natural Gas (LNG). Its pipe wall from interior to exterior is interior sandwich layer, filling layer, enhancement layer, heat preservation, isolation layer and outer jacket in proper order, and wherein, interior sandwich layer is corrugated metal pipe, and the filling layer is the polyurethane sealing strip of winding in the bellows outer wall trough, and the enhancement layer comprises low temperature resistant metal or high-strength fiber winding, and the heat preservation comprises aerogel insulation material, and the isolation layer cladding is fixed heat preservation, the outer jacket is made by thermoplastic. The flexible composite pipe has the characteristics of ultralow temperature resistance, good environmental adaptability, high safety coefficient, light weight and easiness in coiling and releasing.
Description
Technical Field
The invention belongs to the technical field of reinforced composite pipes, and particularly relates to a lightweight ultralow temperature resistant flexible composite pipe which is particularly suitable for conveying ultralow temperature media such as Liquefied Natural Gas (LNG).
Background
The reinforced composite pipe is a flexible composite pipe which is formed by extruding thermoplastic plastics to form an inner core pipe surface, winding a plurality of layers of reinforcing layers in an angle staggered way by using steel belts or high-strength fibers, and then extruding the thermoplastic plastics as an outer protective layer; compared with the traditional metal pipeline, the pipeline has the characteristics of corrosion resistance, high pressure resistance, high tensile strength and the like, and is widely applied to transportation pipelines, municipal water supply and drainage pipelines of other liquid and gas materials in land or ocean oil fields.
At present, with the continuous promotion of the national environmental protection strategy, the use amount of natural gas as a clean fuel is increased rapidly year by year, ship transportation is used as one of main transportation modes of liquid natural gas, and when ships unload, due to factors such as ship berthing directions, ship self-motion, berthing position hydrology conditions and the like, a steel pipeline has a large safety risk. The traditional reinforced composite pipe has certain flexibility and can replace a steel pipeline to a certain extent, but the low-temperature resistance of the traditional reinforced composite pipe is not good, so that the traditional reinforced composite pipe becomes the most critical constraint factor in practical production application. The invention of patent No. CN 108644492A discloses an ultralow temperature resistant steel belt reinforced thermoplastic composite pipe, the pipe wall of which is composed of an inner liner layer, a wear-resistant layer, a tensile layer, a functional layer, a middle protective layer, a heat-insulating layer and an outer protective layer. The functional layer of the structure is made of resin materials such as PE and PP, has low temperature resistance, and can obviously not bear LNG (liquefied natural gas) ultralow temperature liquid at minus 163 ℃; secondly, a steel belt is used as a tensile layer and a compression layer of the pipeline, so that the integral dead weight of the pipeline is obviously increased, the rolling radius is influenced by the over-thick pipe wall, and the flexibility is reduced; in addition, the patent relates to there is the problem in low temperature resistant each interlaminar setting order, and difficult processing manufacturing, in the pipeline actual work, has the operation unstability, the big scheduling problem of safety risk.
Disclosure of Invention
The invention aims to provide an ultralow temperature resistant flexible composite tube which is resistant to ultralow temperature, good in environmental adaptability, high in safety coefficient, light in weight and easy to coil and retract.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a light-weight ultralow temperature-resistant flexible composite pipe comprises an inner core layer, a filling layer, a reinforcing layer, a heat insulation layer, an isolation layer and an outer protective layer which are sequentially arranged on the pipe wall from inside to outside; wherein, the inner core layer is corrugated metal pipe, the filling layer is the winding polyurethane sealing strip in the bellows outer wall trough, the enhancement layer comprises low temperature resistant metal or high strength fiber winding, the heat preservation comprises aerogel insulation material, the isolation layer cladding is fixed the heat preservation, the outer jacket is made by thermoplastic.
The additional technical characteristics that constitute above-mentioned resistant ultra-low temperature flexible composite pipe of lightweight still include:
the reinforcing layer is formed by winding a plurality of layers of low-temperature-resistant steel wires in a crossed manner; wherein the winding angle is 54.7 degrees;
-the metal bellows constituting the inner core layer and the low temperature resistant steel wires constituting the reinforcement layer are both made of 304 stainless steel or 316L stainless steel;
aerogel insulation materials comprising the insulation include, but are not limited to, silica aerogel, zirconia aerogel, alumina aerogel and carbon aerogel;
the isolating layer is a glass fiber reinforced adhesive tape spirally wound on the surface of the heat-insulating layer;
-the outer protective layer is extrusion molded from polyethylene or polypropylene resin;
a tensile layer is arranged between the isolation layer and the outer protection layer, and the tensile layer is a plurality of high-strength fiber wires or metal wires which are laid along the axial direction of the pipeline;
the high-strength fiber yarns forming the tensile layer are aramid fibers and are symmetrically arranged on the two sides of the pipe body.
Compared with the prior art, the light-weight ultralow temperature-resistant flexible composite pipe provided by the invention has the following advantages: firstly, because the inner core layer of the composite pipe is a metal corrugated pipe, and the filling layer is a polyurethane sealing strip wound in a wave trough of the outer wall of the corrugated pipe, the corrugated wall of the inner core pipe can be structurally reinforced, the inner core pipe is prevented from collapsing when the pipeline is coiled, gaps can be filled, and the heat flow loss is reduced; secondly, because the heat-insulating layer is made of aerogel heat-insulating material, the size of pores in the material is in the order of magnitude of nanometers, the air convection heat transfer and the solid phase heat transfer can be effectively inhibited, the heat-insulating condition of a flexible or rigid pipeline with the temperature application range of-200 ℃ to 800 ℃ is met, and the ultralow temperature resistance is very excellent; thirdly, because the filling layer is winding polyurethane sealing strip, the enhancement layer comprises low temperature resistant metal or high strength fiber winding, and the heat preservation uses gas as dispersion medium's gel material, and this composite construction's flexible composite tube of ultralow temperature weight obviously reduces, and the bending coil performance is better, adapts to multiple complex environmental condition, carries medium safety and stability.
Drawings
Fig. 1 is a schematic structural view of a lightweight ultralow temperature-resistant flexible composite tube according to the present invention.
Detailed Description
The structure and the working principle of the light-weight ultralow temperature-resistant flexible composite pipe provided by the invention are further described in detail with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a lightweight ultralow temperature-resistant flexible composite tube provided by the invention is shown. The pipe wall that constitutes this resistant ultra-low temperature flexible composite pipe of lightweight is inlayer layer 1 from interior to exterior in proper order, filling layer 2, enhancement layer 3, heat preservation 4, isolation layer 5 and outer jacket 6, wherein, inlayer layer 1 is corrugated metal pipe, filling layer 2 is the polyurethane sealing strip of winding in corrugated pipe outer wall trough, enhancement layer 3 comprises low temperature resistant metal or high-strength fiber winding, heat preservation 4 comprises aerogel insulation material, the fixed heat preservation 4 of 5 claddings of isolation layer, outer jacket 6 is made by thermoplastic.
The working principle is as follows: this inner core layer 1 of composite pipe is low temperature resistant corrugated metal pipe, at corrugated metal pipe's trough department winding polyurethane sealing strip, carry out the structure to the ripple outer wall and fill the reinforcement, prevent that the coiling from caving in, and can reduce the heat loss, at filling layer 2 outer winding low temperature resistant metal or high strength fiber, improve composite pipe to the bearing degree of axial and hoop stress, lay aerogel insulation material outside enhancement layer 3, isolation layer 5 is fixed with its cladding, outside with thermoplastic extrusion moulding.
The insulating layer 4 of the composite pipe selects aerogel with lighter weight, is a nano porous solid material which takes gas as a dispersion medium and has a network structure, is formed by mutually accumulating colloidal particles or high polymer molecules, and the size of pores in the material is in the order of magnitude of nanometers. The voidage is as high as 80-99.8%, the typical size of the holes is 1-100 nanometers, the density can be as low as 3 kg/m3, the heat conductivity coefficient can be as low as 0.012W/(m.K), and the low temperature resistance of the flexible composite pipe is obviously enhanced.
In the structure of the light-weight ultralow temperature-resistant flexible composite pipe,
in order to further improve the structural strength of the composite pipe, the reinforcement layer 3 is formed by winding a plurality of layers of low-temperature-resistant steel wires in a crossed manner, the number of the steel wire layers is preferably an even number, adjacent layers can be non-adhered and can slide, and the winding angle is preferably 54.7 degrees, so that the annular and axial bearing capacity of the pipeline can be enhanced, the stress in two directions can be balanced, and the safe and stable operation of the pipeline can be ensured;
furthermore, the metal corrugated pipe forming the inner core layer 1 and the low temperature resistant steel wires forming the reinforcement layer 3 are both made of 304 stainless steel or 316L stainless steel, the 304 type stainless steel is the first choice of low temperature resistant materials above-196 ℃ (liquid nitrogen temperature), the price is low, the manufacturing cost of the pipeline is low, the 304L type ultra-low carbon stainless steel and 3016 type stainless steel have high nickel content and are suitable for the low temperature range of-196 ℃ to-253 ℃ (liquid hydrogen temperature), the 316L stainless steel contains 2% to 3% of Mo, the heat strength and the capability of resisting chloride ion point corrosion are improved, and the stainless steel is suitable for the ultra-low temperature range above-269 ℃ (liquid helium temperature);
the aerogel thermal insulation material forming the thermal insulation layer 4 has various types, and silica aerogel, zirconia aerogel, alumina aerogel or carbon aerogel can be selected according to the specific application scene of the composite pipe, so that the composite pipe has different characteristics of fire prevention, sound insulation, acid and alkali corrosion resistance, oxidation resistance and the like on the premise of meeting the low temperature resistance requirement. Because the pores of the aerogel are nanoscale, and the density is extremely low, the good heat insulation and heat preservation and fireproof separation effects can be achieved only by a very thin layer, so that the thickness of the pipe wall of the composite pipe is greatly reduced, the coiled flexibility of the composite pipe is more excellent, and the weight is obviously reduced compared with other low-temperature-resistant composite pipes;
preferably, the isolation layer 5 is a glass fiber reinforced adhesive tape spirally wound on the surface of the insulation layer 4, and can tightly fix the material of the insulation layer 4, prevent the composite pipe from being laminated when being coiled, and provide a flat surface capable of being coated for the outer protection layer, so that the composite pipe is integrally formed;
the outer protective layer is formed by extruding polyethylene or polypropylene resin, so that the pipeline has certain tensile strength and bending resistance, the flexibility and impact resistance of the pipeline are improved, and the pipeline structure is prevented from being damaged by corrosion and mechanical damage of an external medium;
preferably, a tensile layer 7 is arranged between the isolation layer 5 and the outer protection layer, the tensile layer 7 is a plurality of high-strength fiber wires or metal wires which are laid along the axial direction of the pipeline, and axial tows can play an axial reinforcing role, so that the composite pipe can bear high axial tension, and the service life of the composite pipe is prolonged;
furthermore, the high-strength fiber yarns forming the tensile layer 7 are aramid fibers and are symmetrically arranged on two sides of the pipe body, and the aramid fibers are light in weight, high in tensile strength and good in flexibility, so that the light weight characteristic of the composite pipe is more prominent.
Claims (7)
1. The utility model provides a resistant ultra-low temperature flexible composite pipe of lightweight which characterized in that: the pipe wall of the pipe is sequentially provided with an inner core layer, a filling layer, an enhancement layer, a heat insulation layer, an isolation layer and an outer protective layer from inside to outside; wherein, the inner core layer is corrugated metal pipe, the filling layer is the winding polyurethane sealing strip in the bellows outer wall trough, the enhancement layer comprises low temperature resistant metal or high strength fiber winding, the heat preservation comprises aerogel insulation material, the isolation layer cladding is fixed the heat preservation, the outer jacket is made by thermoplastic.
2. The light-weight ultralow temperature-resistant flexible composite pipe according to claim 1, characterized in that: the enhancement layer is formed by alternately winding a plurality of layers of low-temperature-resistant steel wires; wherein the winding angle is 54.7 degrees.
3. The light-weight ultralow temperature-resistant flexible composite pipe according to claim 2, characterized in that: the metal corrugated pipe constituting the inner core layer and the low temperature resistant steel wire constituting the reinforcing layer are both made of 304 stainless steel or 316L stainless steel.
4. The light-weight ultralow temperature-resistant flexible composite pipe according to claim 1, characterized in that: the isolation layer is a glass fiber reinforced adhesive tape spirally wound on the surface of the heat insulation layer.
5. The light-weight ultralow temperature-resistant flexible composite pipe according to claim 1, characterized in that: the outer protective layer is formed by extruding polyethylene or polypropylene resin.
6. The light-weight ultralow temperature-resistant flexible composite pipe according to claim 1, characterized in that: and a tensile layer is arranged between the isolation layer and the outer protection layer, and the tensile layer is a plurality of high-strength fiber wires or metal wires laid along the axial direction of the pipeline.
7. The light-weight ultralow temperature-resistant flexible composite pipe according to claim 6, wherein: the high-strength fiber yarns forming the tensile layer are aramid fibers and are symmetrically arranged on two sides of the pipe body.
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| CN202020308231.XU CN211875334U (en) | 2020-03-13 | 2020-03-13 | Lightweight ultralow temperature resistant flexible composite pipe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413246A (en) * | 2020-11-25 | 2021-02-26 | 浙江蔚福科技股份有限公司 | Semiconductor cooling pipeline and processing method thereof |
| CN114382957A (en) * | 2022-01-14 | 2022-04-22 | 中海石油气电集团有限责任公司 | LNG low-temperature hose body forming method |
| CN114645976A (en) * | 2020-12-21 | 2022-06-21 | 中国石油化工股份有限公司 | Fiber prepreg tape reinforced composite pipe and processing method thereof |
| WO2023185011A1 (en) * | 2022-03-31 | 2023-10-05 | 江苏正道海洋科技有限公司 | High-temperature-resistant heat-insulating flexible composite pipe |
| CN117128371A (en) * | 2022-09-23 | 2023-11-28 | 漯河利通液压科技股份有限公司 | Hose, hose assembly and preparation method |
-
2020
- 2020-03-13 CN CN202020308231.XU patent/CN211875334U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413246A (en) * | 2020-11-25 | 2021-02-26 | 浙江蔚福科技股份有限公司 | Semiconductor cooling pipeline and processing method thereof |
| CN114645976A (en) * | 2020-12-21 | 2022-06-21 | 中国石油化工股份有限公司 | Fiber prepreg tape reinforced composite pipe and processing method thereof |
| CN114382957A (en) * | 2022-01-14 | 2022-04-22 | 中海石油气电集团有限责任公司 | LNG low-temperature hose body forming method |
| CN114382957B (en) * | 2022-01-14 | 2023-12-01 | 中海石油气电集团有限责任公司 | LNG low-temperature hose body forming method |
| WO2023185011A1 (en) * | 2022-03-31 | 2023-10-05 | 江苏正道海洋科技有限公司 | High-temperature-resistant heat-insulating flexible composite pipe |
| CN117128371A (en) * | 2022-09-23 | 2023-11-28 | 漯河利通液压科技股份有限公司 | Hose, hose assembly and preparation method |
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