CN114440014B - Thermal-insulated heat preservation nonmetallic composite pipe - Google Patents
Thermal-insulated heat preservation nonmetallic composite pipe Download PDFInfo
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- CN114440014B CN114440014B CN202011217275.2A CN202011217275A CN114440014B CN 114440014 B CN114440014 B CN 114440014B CN 202011217275 A CN202011217275 A CN 202011217275A CN 114440014 B CN114440014 B CN 114440014B
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- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 238000004321 preservation Methods 0.000 title description 7
- 238000009413 insulation Methods 0.000 claims abstract description 27
- 230000006835 compression Effects 0.000 claims abstract description 20
- 238000007906 compression Methods 0.000 claims abstract description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 239000012774 insulation material Substances 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims description 18
- 239000004964 aerogel Substances 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 13
- 229920001169 thermoplastic Polymers 0.000 claims description 12
- 239000004416 thermosoftening plastic Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 229920006351 engineering plastic Polymers 0.000 claims description 7
- 229920001721 polyimide Polymers 0.000 claims description 7
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 5
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 5
- 239000004642 Polyimide Substances 0.000 claims description 4
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 239000011496 polyurethane foam Substances 0.000 claims description 4
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 claims description 3
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 3
- 229920006231 aramid fiber Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 239000004643 cyanate ester Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003192 poly(bis maleimide) Polymers 0.000 claims description 3
- 239000009719 polyimide resin Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 3
- 229920006337 unsaturated polyester resin Polymers 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 239000010779 crude oil Substances 0.000 abstract description 33
- 239000003921 oil Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 2
- 229920003020 cross-linked polyethylene Polymers 0.000 description 2
- 239000004703 cross-linked polyethylene Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Classifications
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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
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
-
- 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
- F16L59/04—Arrangements using dry fillers, e.g. using slag wool which is added to the object to be insulated by pouring, spreading, spraying or the like
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
- Laminated Bodies (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention discloses a heat-insulating nonmetallic composite pipe, which comprises a smooth inner layer of an innermost layer, wherein a heat-insulating layer is arranged on the outer wall of the smooth inner layer, a compression layer is arranged on the outer wall of the heat-insulating layer, and a protective outer layer is arranged on the outer wall of the compression layer; the heat insulation layer is divided into an inner wall, an annular wave structure and an outer wall, the annular wave structure divides the heat insulation layer into alternate hollow cavities, and heat insulation materials are embedded in the cavities. The heat-insulating nonmetallic composite pipe provided by the invention has excellent heat-insulating performance, and the temperature of the transported crude oil per kilometer is reduced, so that the purposes of reducing energy consumption and saving the production cost of an oil field in the transportation process of the crude oil are realized.
Description
Technical Field
The invention relates to the technical field of composite pipes, in particular to a heat-insulating nonmetallic composite pipe.
Background
In the crude oil conveying process, the conveying pipeline faces the problems of heat insulation, heat preservation, compression resistance, conveying efficiency and the like, and provides new technical challenges for the existing conveying pipeline. At present, the oil pipeline is used for carrying out heat exchange on crude oil in the process of carrying the crude oil, so that the temperature of the crude oil is reduced every kilometer, the viscosity of the crude oil is increased due to sudden temperature drop, the crude oil is easy to block in the pipeline, the flow of the crude oil in the pipeline is influenced, the crude oil conveying safety cannot be ensured, the conveying efficiency of the crude oil is influenced, and meanwhile, the crude oil in a conveying pipe is required to be supplied with energy in order to keep the normal conveying state of the crude oil, so that the cost of crude oil exploitation is increased. Therefore, research and development of a composite pipe are conducted to reduce heat exchange between crude oil in the pipe and the environment and reduce energy supply, so that energy is saved, development cost is reduced, and the technical problem to be solved by those skilled in the art is urgent.
Chinese patent CN201720787612.9 discloses a lining wear-resistant, heat-insulating and heat-preserving composite oil pipe, the oil pipe is from inside to outside composed of an anti-eccentric wear liner pipe, a pressure-bearing inner pipe, a heat-insulating and heat-preserving layer, a steel oil pipe and anti-sliding forced sealing devices and forced sealing devices arranged at two ends of the oil pipe respectively, the processed oil pipe connects a plurality of oil pipes together to be used in the well through an oil pipe coupling, the eccentric wear of a rod pipe in the oil well can be effectively solved, the loss of the self temperature of crude oil in the process of lifting crude oil from the bottom of the well to the wellhead is reduced, the crude oil temperature of the well shaft and the wellhead is increased, wax deposition and scaling in the oil pipe are improved, and the flow state of crude oil in the well shaft is improved. However, the processing technology of the composite oil pipe is complex, the composite oil pipe has large mass, the difficulty of long-distance transportation is increased, and the large-scale industrial production is not facilitated.
Chinese patent CN201821219038.8 discloses an aerogel heat insulation composite pipe, the composite pipe comprises an inner layer ultra-high molecular polyethylene and an outer layer crosslinked polyethylene which are annular in section and sleeved together and extend towards two ends infinitely along the axial direction, a steel wire mesh protection heat insulation layer with the axial length consistent with that of the inner layer and the outer layer is integrally arranged between the inner layer ultra-high molecular polyethylene and the outer layer crosslinked polyethylene, the steel wire mesh protection heat insulation layer consists of a steel wire mesh skeleton and aerogel solution, and the aerogel solution is coated on the steel wire mesh skeleton. According to the composite pipe, the aerogel solution is coated on the steel wire mesh framework, so that the aerogel is filled in the grids of the steel wire mesh framework to form a three-dimensional interweaved structure, the performances of abrasion resistance, compression resistance, impact resistance, folding resistance, heat preservation and the like of a pipeline are improved, but the temperature of the transported crude oil per kilometer cannot be reduced by the composite pipe to be less than 4 ℃, so that the energy consumption is reduced in the transportation process of the crude oil, and the aim of saving the production cost of an oil field is fulfilled.
At present, the crude oil conveyed by the heat-insulating composite pipe has larger temperature drop per kilometer, can not well ensure the high-efficiency of long-distance conveying of the crude oil, and meanwhile, has lower compression resistance in a high-pressure working environment, and can not meet the requirement of conveying the crude oil in a severe environment.
Disclosure of Invention
In view of the foregoing, the present invention provides a thermal insulation nonmetallic composite pipe to further improve the foregoing problems.
For this purpose, the invention is implemented by the following technical scheme.
The heat-insulating nonmetallic composite pipe mainly comprises a smooth inner layer of an innermost layer, wherein a heat-insulating layer is arranged on the outer wall of the smooth inner layer, a compression-resistant layer is arranged on the outer wall of the heat-insulating layer, and a protective outer layer is arranged on the outer wall of the compression-resistant layer;
the heat insulation layer is of a multi-layer structure, and comprises an inner wall, an annular wave structure and an outer wall from inside to outside in sequence; the annular wave structure is filled with heat insulation materials.
Further, the smooth inner layer is made of thermoplastic engineering plastics.
Further, a cavity clamping structure is formed between the inner wall and the outer wall, and the cavity clamping structure is supported by the annular wave structure; the section of the annular wave structure is in an annular wave shape, and the clamping cavity is divided into alternate hollow cavities; the hollow cavity is filled with heat insulation materials.
Further, any side of the annular wave structure forms a bending angle alpha with the tangential direction of the inner side vertex, and the bottom forms a bending angle beta which is complementary with the alpha; the thickness of the annular wave structure is a, and the height of a single side is h; wherein the bending angle α is 45 °, the bending angle β is 45 °, a=7mm, and h=20mm.
Furthermore, the inner wall, the annular wave structure and the outer wall in the heat insulation layer are made of rigid polyurethane foam plastics.
Furthermore, the heat insulation material is basalt fiber-thermoplastic polyurethane-SiO 2 aerogel composite material, wherein the ratio of basalt fiber to thermoplastic polyurethane to SiO2 aerogel is 1:1:18.
Further, the compression-resistant layer is made of fiber reinforced resin matrix composite materials, and the fiber reinforcement comprises one or more of carbon fibers, glass fibers, quartz fibers, aramid fibers, ultra-high molecular weight polyethylene fibers and polyimide fibers; the resin comprises one or more of epoxy resin, polyimide resin, bismaleimide resin, cyanate ester and unsaturated polyester resin.
Further, the protective outer layer is made of thermoplastic engineering plastics.
Further, in the smooth inner layer, the heat insulation layer, the compression layer and the protection outer layer, two adjacent layers are fixedly connected through an adhesive.
The invention has the following advantages:
according to the invention, through the heat insulation layer with the annular wave structure, heat exchange between crude oil and the environment is effectively reduced, so that the temperature of the crude oil per kilometer is reduced, the crude oil can smoothly circulate in a pipeline, the safety of crude oil transportation is ensured, the transportation efficiency of the crude oil is improved, the energy consumption of the crude oil in the transportation process is reduced, and the production cost of an oil field is saved; simultaneously combines the compression-resistant layer and the protective outer layer, so that the pipeline has good compression-resistant performance, can adapt to severe environments, and can be used as a crude oil exploitation conveying pipe.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the embodiments will be briefly described below, and it will be apparent that the drawings in the following description are only one or several embodiments of the present invention, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
The same numbers of structural distributions and locations shown in the drawings are for convenience in describing the invention only and are not intended to indicate or imply that the structures referred to must have a particular orientation, number of distributions, and are not to be construed as limiting the invention.
FIG. 1 is a schematic cross-sectional view of a composite tube according to the present invention;
fig. 2 is a partially enlarged schematic view of fig. 1 at a.
In the figure:
1-a smooth inner layer; 2-a heat insulation layer; 3-a compression layer; 4-a protective outer layer; 5-inner wall; 6-ring wave structure; 7-outer wall.
Detailed Description
In the description of the present invention, it should be noted that the terms "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in fig. 1. Such terminology is used for convenience in describing the invention and is not to be taken as an indication or suggestion that the device or element in question must have a particular orientation, be constructed and operated in a particular orientation and therefore should not be construed as limiting the invention.
The invention will be further described with reference to fig. 1 and 2.
The utility model provides a thermal-insulated heat preservation nonmetallic composite pipe, as shown in figure 1, including smooth inlayer 1 of inlayer, set up thermal-insulated heat preservation 2 at the outer wall of smooth inlayer 1, the outer wall of thermal-insulated heat preservation 2 sets up compressive layer 3, the outer wall of compressive layer 3 sets up the protection skin 4. The heat insulation layer 2 is of a multi-layer structure and is divided into an inner wall 5, an annular wave structure 6 and an outer wall 7 from inside to outside, the annular wave structure 6 divides the heat insulation layer into alternate hollow cavities, and heat insulation materials are embedded in the cavities.
Preferably, in the smooth inner layer 1, the heat insulation layer 2, the compression layer 3 and the protective outer layer 4, two adjacent layers are fixedly connected through an adhesive.
The smooth inner layer 1 is formed by extrusion of thermoplastic engineering plastics, the thermoplastic engineering plastics are thermoplastic polyurethane, and the thickness of the smooth inner layer 1 is 1-20mm.
Preferably, a cavity structure is formed between the inner wall 5 and the outer wall 7, and the cavity structure is supported by the annular wave structure 6; as shown in fig. 1, the cross section of the annular wave structure 6 is in an annular wave shape and divides the clamping cavity into alternate hollow cavities; meanwhile, the annular wave structure 6 provides a supporting function for the cavity, and a heat insulation material is embedded in the cavity. Wherein the inner wall 5, the annular wave structure 6 and the outer wall 7 are constructed of foamed rigid polyurethane foam. The thickness of the inner wall 5 and the outer wall 7 of the heat insulation layer is 1-5mm. The annular wave structure 6 has a width of 10mm-25mm and a thickness of 1-10mm. The connection between the inner wall 5 and the outer wall 7 of the heat insulation layer and the annular wave structure 6 is bonded by an adhesive.
Preferably, as shown in fig. 2, any side of the annular wave structure 6 forms a bending angle alpha with the tangential direction of the inner vertex, and the bottom forms a bending angle beta which is complementary to the alpha; the thickness of the annular wave structure 6 is a, the height of a single side is h (taking the tangential line of the wave top as a reference and measuring the difference from the top to the adjacent bottom along the radial direction of the vertex). Further, the thickness of the inner wall 5 and the outer wall 7 of the heat insulating layer was set to 3mm, and compression tests were performed on the annular wave structures 6 of different sizes, and the test results are shown in tables 1 and 2 below.
| Sequence number | α(°) | β(°) | Compressive strength (MPa) |
| 1 | 30 | 60 | 0.25 |
| 2 | 45 | 45 | 0.32 |
| 3 | 60 | 30 | 0.27 |
Table 1 test of bending angle versus compressive strength of annular wave structure
| Sequence number | a(mm) | h(mm) | Compressive strength (MPa) |
| 1 | 3 | 10 | 0.26 |
| 2 | 5 | 15 | 0.31 |
| 3 | 7 | 20 | 0.36 |
| 4 | 10 | 25 | 0.29 |
Table 2 test of the compressive strength of the wave structure to the annular wave structure in terms of thickness and height
As can be seen from the test results, the optimal solution of the comprehensive compressive strength is not a common equilateral triangle structure, so the design is preferably that the bending angle alpha=45°, and the bending angle beta=45°; it can be further derived that the integrated compressive strength is optimal when the thickness a=7mm and the single-side height h is 20mm.
Preferably, the heat insulation material is basalt fiber-thermoplastic polyurethane-SiO 2 aerogel composite material.
Thermal performance tests were performed on basalt fiber-thermoplastic polyurethane-SiO 2 aerogel composites of different component ratios, the thermal conductivities of which are shown in table 3. From the test results, when the ratio of basalt fiber to thermoplastic polyurethane to SiO2 aerogel is 1:1:18, the thermal conductivity is the lowest, and the thermal insulation performance is the best. Therefore, the preferable ratio of the components is 1:1:18.
Table 3 testing of the ratio of the composite components versus the thermal conductivity of the composite
The compression-resistant layer 3 is made of fiber reinforced resin matrix composite material, and the fiber reinforcement comprises one or more mixed fiber reinforcements of carbon fiber, glass fiber, quartz fiber, aramid fiber, ultra-high molecular weight polyethylene fiber and polyimide fiber. The resin comprises one or more of epoxy resin, polyimide resin, bismaleimide resin, cyanate ester and unsaturated polyester resin. In this embodiment, the fiber reinforcement is selected from polyimide fibers, and the resin is selected from epoxy resin, wherein the ratio is 1:9. The thickness of the compression layer 3 is 1-20mm.
The protective outer layer 4 is made of thermoplastic engineering plastics, and is formed by extrusion molding of thermoplastic polyurethane elastomer rubber, and the thickness of the protective outer layer 4 is 1-20mm.
The adhesive among the smooth inner layer 1, the heat insulation layer 2, the compression layer 3 and the protective outer layer 4 is adhesive resin.
The heat insulation nonmetallic composite pipe in the embodiment is subjected to a conveying temperature simulation test, and a simulation test result that the temperature drop of crude oil per kilometer is less than 4 ℃ can be obtained. Because the heat insulation layer in the heat insulation nonmetallic composite pipe is made of hard polyurethane foam plastic, and meanwhile, the heat insulation layer is supported by adopting an embedded annular wave structure, a hollow structure which is vertically alternated is constructed, and the novel heat insulation material basalt fiber-thermoplastic polyurethane-SiO 2 aerogel filled in the hollow structure has excellent heat insulation effect, and reduces heat exchange between crude oil and the environment.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (6)
1. The heat-insulating nonmetallic composite pipe is characterized by comprising a smooth inner layer (1) of an innermost layer, wherein a heat-insulating layer (2) is arranged on the outer wall of the smooth inner layer (1), a compression-resistant layer (3) is arranged on the outer wall of the heat-insulating layer (2), and a protective outer layer (4) is arranged on the outer wall of the compression-resistant layer (3);
the heat insulation layer (2) is of a multi-layer structure, and comprises an inner wall (5), an annular wave structure (6) and an outer wall (7) from inside to outside in sequence; a cavity clamping structure is formed between the inner wall (5) and the outer wall (7), and is supported by the annular wave structure (6); the section of the annular wave structure (6) is in an annular wave shape, and the clamping cavity is divided into alternate hollow cavities; the hollow cavity is filled with heat insulation materials, the inner wall (5), the annular wave structure (6) and the outer wall (7) in the heat insulation layer (2) are made of rigid polyurethane foam plastics, and the heat insulation materials are basalt fiber-thermoplastic polyurethane-SiO 2 aerogel composite materials, wherein the ratio of basalt fiber to thermoplastic polyurethane to SiO2 aerogel is 1:1:18.
2. Nonmetallic composite tube according to claim 1, characterized in that the smooth inner layer (1) is a thermoplastic engineering plastic.
3. Nonmetallic composite tube according to claim 2, characterized in that either side of the annular wave structure (6) forms a bending angle α with the tangential direction of the inboard apex, the bottom forms a bending angle β complementary to α; the thickness of the annular wave structure (6) is a, and the height of a single side is h; wherein the bending angle α is 45 °, the bending angle β is 45 °, a=7mm, and h=20mm.
4. The nonmetallic composite tube according to claim 1, wherein the compression-resistant layer (3) is made of fiber reinforced resin matrix composite material, and the fiber reinforcement comprises one or more of carbon fiber, glass fiber, quartz fiber, aramid fiber, ultra-high molecular weight polyethylene fiber and polyimide fiber; the resin comprises one or more of epoxy resin, polyimide resin, bismaleimide resin, cyanate ester and unsaturated polyester resin.
5. Nonmetallic composite tube according to claim 1, characterized in that the material of the protective outer layer (4) is a thermoplastic engineering plastic.
6. The nonmetallic composite pipe according to claim 1, wherein in the smooth inner layer (1), the heat insulation layer (2), the compression-resistant layer (3) and the protective outer layer (4), two adjacent layers are fixedly connected through an adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011217275.2A CN114440014B (en) | 2020-11-04 | 2020-11-04 | Thermal-insulated heat preservation nonmetallic composite pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011217275.2A CN114440014B (en) | 2020-11-04 | 2020-11-04 | Thermal-insulated heat preservation nonmetallic composite pipe |
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| CN114440014A CN114440014A (en) | 2022-05-06 |
| CN114440014B true CN114440014B (en) | 2024-03-29 |
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