Insulation pipe shell structure based on phenolic foam and insulation pipe shell
The phenolic foam insulation pipe shell, designed with a composite layer structure and mortise and tenon joints, solves the problems of thermal bridging, complex installation, and insufficient fire resistance of traditional materials, achieving efficient and reliable pipe insulation.
Patent Information
- Application Number
- CN202520580231.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Traditional pipe insulation materials are prone to forming thermal bridges at joints, are complex to install, have poor environmental performance, and insufficient fire resistance. Furthermore, phenolic foam is brittle and has poor interfacial bonding, making it difficult to apply in complex working conditions.
It adopts a composite layer structure, with a closed-cell phenolic foam inner lining, an aluminum foil composite fiberglass cloth reflective layer, and a flame-retardant polymer material or fiber-reinforced composite material protective layer. Combined with a mortise and tenon joint design, it forms a multi-layer synergistic effect to improve thermal insulation performance and structural strength.
It significantly reduces thermal conductivity, enhances mechanical stability, achieves double moisture-proof sealing, simplifies installation process, improves construction efficiency, is suitable for a variety of harsh working conditions, and has Class A fire safety and environmental protection features.
Smart Images
Figure CN223868839U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipeline insulation technology, and in particular to an insulation pipe shell structure and insulation pipe shell based on phenolic foam. Background Technology
[0002] Traditional pipe insulation materials such as rock wool and polyurethane have significant drawbacks in practical applications. First, single-layer insulation materials are prone to thermal bridging at joints, leading to increased heat loss and failing to meet high-efficiency insulation requirements. Second, the installation process of existing materials is complex, typically relying on adhesives or straps for fixation, resulting in low construction efficiency and environmental impact due to the use of chemical adhesives. Furthermore, traditional materials are prone to moisture absorption and cracking over long-term use, leading to a gradual deterioration in insulation performance. More seriously, some materials lack sufficient fire resistance and flame retardancy, potentially releasing toxic gases when exposed to fire, posing a safety hazard.
[0003] Phenolic foam, as a novel thermal insulation material, possesses excellent flame retardancy (B1 grade) and low smoke density. However, its high brittleness and poor interfacial bonding have not been effectively resolved, limiting its application in complex working conditions. Current technologies for improving phenolic foam mainly focus on optimizing single properties, lacking a comprehensive solution that balances thermal insulation and structural strength.
[0004] Therefore, those skilled in the art urgently need a thermal insulation pipe shell that can integrate a multi-layer composite structure to improve the overall performance of the thermal insulation pipe shell. Utility Model Content
[0005] To overcome the shortcomings of existing technologies, this utility model provides a heat-insulating pipe shell structure based on phenolic foam, such as... Figure 1 As shown, it includes a composite layer structure, which consists of an inner lining layer, a reflective layer attached to the outer surface of the inner lining layer, and a protective layer covering the outer surface of the reflective layer, from the inside out. The inner lining layer is made of phenolic foam; the reflective layer is made of aluminum foil composite fiberglass cloth; and the protective layer is made of flame-retardant polymer material or fiber-reinforced composite material.
[0006] Based on the above scheme, the phenolic foam is further specified as closed-cell phenolic foam; the density of the closed-cell phenolic foam is 60-80 kg / m³, and the thermal conductivity is ≤0.025 W / (m·K).
[0007] The above solution reduces heat transfer through air convection by using a closed-cell structure; low thermal conductivity ensures core insulation performance; and high density enhances mechanical stability and prevents brittle cracking.
[0008] Based on the above scheme, the reflectivity of the aluminum foil composite fiberglass cloth is further ≥95%.
[0009] Using the above solution, the high reflectivity of the aluminum foil composite fiberglass cloth significantly blocks radiative heat conduction, reduces the heat loss rate at the seams, and forms a dual heat preservation mechanism of "heat insulation + reflection" with the phenolic foam layer.
[0010] Based on the above scheme, the flame-retardant polymer material is one of flame-retardant PVC, flame-retardant polypropylene, or flame-retardant polyester; the fiber-reinforced composite material is fiberglass.
[0011] Preferably, the flame-retardant polymer material is flame-retardant PVC.
[0012] Using the above methods, the flame-retardant PVC material meets the Class A fire protection standard; the fiberglass has corrosion resistance and can adapt to chemical environments.
[0013] Based on the above scheme, further, the compressive strength of the flame-retardant PVC or fiberglass is ≥0.3MPa.
[0014] Using the above scheme, the compressive strength ≥0.3MPa ensures that the protective layer can withstand mechanical impact and direct underground burial pressure.
[0015] Based on the above scheme, the thickness of the inner lining layer is 20-50mm; the thickness of the reflective layer is 0.1-0.3mm; and the thickness of the protective layer is 1-2mm.
[0016] Specifically, the thickness of the inner lining, reflective layer, and protective layer is within the range mentioned above. The purpose is to balance thermal insulation efficiency with structural lightweighting. Too thin a layer will affect performance, while too thick a layer will increase cost and construction difficulty.
[0017] Based on the above solutions, further, such as Figure 1-2 As shown, the insulation pipe shell has a tenon-and-mortise joint structure at both ends, including a protrusion and a groove that matches the protrusion.
[0018] Preferably, at least two symmetrical protrusions or grooves are provided at one end of the heat-insulating pipe shell.
[0019] Based on the above scheme, the cross-sectional shape of the protrusion and the groove is one of trapezoidal, triangular, rectangular or circular arc.
[0020] Preferred, such as Figure 1-2 As shown, the cross-sectional shape of the protrusion and the groove is trapezoidal.
[0021] More preferably, the trapezoid is an isosceles trapezoid with a height of 5 mm and an angle of 30° between the lower base and the legs.
[0022] Based on the above solution, a high-temperature resistant sealing strip is further provided inside the groove.
[0023] The trapezoidal design provides a self-locking function, the symmetrical distribution of multiple protrusions enhances splicing stability, and the high-temperature resistant sealing strip fills the groove gaps, achieving double moisture protection and airtightness at the joints, which can effectively improve construction efficiency and reduce heat loss rate.
[0024] This utility model also provides a thermal insulation pipe shell, including a pipe shell body, on which the thermal insulation pipe shell structure based on phenolic foam as described above is provided.
[0025] Compared with existing technologies, the phenolic foam-based thermal insulation pipe shell structure and shell provided by this utility model, through the optimized design of the composite layer structure, use a phenolic foam combined with an aluminum foil composite fiberglass cloth reflective layer for the inner lining, which significantly reduces the thermal conductivity and effectively blocks radiative heat conduction, thereby greatly improving the overall thermal insulation performance. The protective layer uses flame-retardant polymer materials or fiber-reinforced composite materials, which not only enhances the mechanical strength and corrosion resistance of the shell, but also ensures that the overall structure meets the Class A non-combustible standard through the flame-retardant properties of the materials themselves, greatly improving fire safety. At the same time, this structure achieves double moisture-proof sealing through multi-layer synergy, significantly reducing water absorption rate, making it less prone to moisture absorption and cracking during long-term use, and exhibiting excellent durability.
[0026] Furthermore, in the preferred solution, the seamless splicing design with mortise and tenon joints eliminates the need for glue or external fasteners, simplifying the installation process, significantly improving construction efficiency, and strictly controlling the heat loss rate at the joints. It is suitable for various harsh working conditions such as HVAC, petrochemical, and underground direct burial, combining environmental protection and engineering practicality. Attached Figure Description
[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 A schematic diagram of the heat-insulating pipe shell structure based on phenolic foam provided by this utility model;
[0029] Figure 2 A schematic diagram of the mortise and tenon joint splicing structure of the thermal insulation pipe shell based on phenolic foam provided by this utility model.
[0030] Figure label:
[0031] 10 - Inner lining layer; 20 - Reflective layer; 30 - Protective layer; 40 - Protrusion; 50 - Groove. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0033] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0034] To address the problem that existing thermal insulation pipe shells cannot simultaneously achieve both phenolic foam insulation and structural strength, this utility model provides the following embodiments.
[0035] Example 1
[0036] Example 1 provides a heat-insulating pipe shell structure based on phenolic foam, such as... Figure 1 As shown, it includes a composite layer structure, which consists of an inner liner 10, a reflective layer 20 attached to the outer surface of the inner liner 10, and a protective layer 30 covering the outer surface of the reflective layer 20, from the inside to the outside.
[0037] The inner lining layer 10 is made of closed-cell phenolic foam, with a thickness of 30 mm, a density of 60-80 kg / m³, and a thermal conductivity of ≤0.025 W / (m·K).
[0038] The reflective layer 20 is made of aluminum foil composite fiberglass cloth with a thickness of 0.2 mm and a reflectivity of ≥95%.
[0039] The protective layer 30 is made of flame-retardant PVC, with a thickness of 1.5 mm and a compressive strength ≥ 0.3 MPa;
[0040] In specific implementation, the composite layer structure described above is wrapped around the pipe shell with a diameter of DN100;
[0041] The insulation pipe shell is provided with a tenon-and-mortise groove structure at both ends, including a protrusion 40 and a groove 50 that matches the protrusion 40. The protrusion 40 and the groove 50 are symmetrically arranged.
[0042] The cross-sectional shape of the protrusion 40 and the groove 50 is trapezoidal, the height of the trapezoid is 5mm, and the angle between the lower base and the waist is 30°.
[0043] A high-temperature resistant sealing strip is provided inside the groove portion 50.
[0044] Referring to the environmental stress cracking test method in HG / T 4372-2012 "Composite Pipes and Fittings for Chemical Use", the phenolic foam-based thermal insulation pipe shell structure provided in Example 1 showed no cracking after 100 cycles of -30-120℃, and the measured heat loss rate at the joints was <5%.
[0045] Example 2
[0046] Based on Example 1, Example 2 provides a heat-insulating pipe shell structure based on phenolic foam, in which the material of the protective layer 30 in Example 1 is replaced with fiberglass, the thickness of which is 2mm and the compressive strength is ≥0.3MPa; the rest of the structure and materials are the same as in Example 1.
[0047] Tests showed that the compressive strength of the pipe shell structure in Example 2 is ≥0.5MPa, making it suitable for underground direct-buried pipelines.
[0048] The composite layer structures of Examples 1 and 2 were tested, and the results showed that compared with ordinary insulation pipe shells, the insulation performance of the insulation pipe shells of Examples 1 and 2 was improved by more than 30%; the mortise and tenon connection eliminated the need for additional fasteners, improving construction efficiency by 50%; the double sealing design resulted in a water absorption rate of less than 3% according to GB / T 25975 standard, and excellent weather resistance; the overall structure met the Class A non-combustible standard GB 8624-2012, ensuring safety and reliability.
[0049] In summary, the phenolic foam-based thermal insulation pipe shell structure and shell provided by this utility model, through the optimized design of the composite layer structure, uses a phenolic foam combined with an aluminum foil composite fiberglass cloth reflective layer as the inner lining layer, which significantly reduces the thermal conductivity and effectively blocks radiative heat conduction, thereby greatly improving the overall thermal insulation performance. The protective layer uses flame-retardant polymer materials or fiber-reinforced composite materials, which not only enhances the mechanical strength and corrosion resistance of the shell, but also ensures that the overall structure meets the Class A non-combustible standard through the flame-retardant properties of the materials themselves, greatly improving fire safety. At the same time, this structure achieves double moisture-proof sealing through multi-layer synergy, significantly reducing water absorption rate, making it less prone to moisture absorption and cracking during long-term use, and exhibiting excellent durability. In addition, the seamless splicing design with mortise and tenon connection device eliminates the need for glue or external fasteners, simplifying the installation process, significantly improving construction efficiency, and strictly controlling the heat loss rate at the joints. It is suitable for various harsh working conditions such as HVAC, petrochemical, and underground direct burial, combining environmental protection and engineering practicality.
[0050] Although this document frequently uses terms such as inner lining layer, reflective layer, protective layer, closed-cell phenolic foam, aluminum foil composite fiberglass cloth, flame-retardant PVC, and fiberglass, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.
[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A thermal insulation pipe shell structure based on phenolic foam, characterized in that: The composite layer structure consists of, from the inside out, an inner lining layer (10), a reflective layer (20) attached to the outer surface of the inner lining layer (10), and a protective layer (30) covering the outer surface of the reflective layer (20). The inner lining layer (10) is made of phenolic foam. The reflective layer (20) is made of aluminum foil composite fiberglass cloth. The protective layer (30) is made of flame-retardant polymer material or fiber-reinforced composite material.
2. The thermal insulation pipe shell structure based on phenolic foam according to claim 1, characterized in that: The phenolic foam is a closed-cell phenolic foam; the density of the closed-cell phenolic foam is 60-80 kg / m³, and the thermal conductivity is ≤0.025 W / (m·K).
3. The thermal insulation pipe shell structure based on phenolic foam according to claim 1, characterized in that: The aluminum foil composite fiberglass cloth has a reflectivity of ≥95%.
4. The thermal insulation pipe shell structure based on phenolic foam according to claim 1, characterized in that: The flame-retardant polymer material is one of flame-retardant PVC, flame-retardant polypropylene, or flame-retardant polyester; the fiber-reinforced composite material is fiberglass.
5. The phenolic foam-based thermal insulation pipe shell structure according to claim 4, characterized in that: The flame-retardant PVC or fiberglass has a compressive strength ≥ 0.3 MPa.
6. The thermal insulation pipe shell structure based on phenolic foam according to claim 1, characterized in that: The thickness of the inner lining layer (10) is 20-50 mm; the thickness of the reflective layer (20) is 0.1-0.3 mm; and the thickness of the protective layer (30) is 1-2 mm.
7. The thermal insulation pipe shell structure based on phenolic foam according to claim 1, characterized in that: The insulation pipe shell is provided with a tenon-and-mortise groove structure at both ends, including a protrusion (40) and a groove (50) that matches the protrusion (40).
8. The thermal insulation pipe shell structure based on phenolic foam according to claim 7, characterized in that: The cross-sectional shape of the protrusion (40) and the groove (50) is one of trapezoidal, triangular or circular arc.
9. The phenolic foam-based thermal insulation pipe shell structure according to claim 7, characterized in that: A high-temperature resistant sealing strip is provided inside the groove (50).
10. A heat-insulating pipe shell, characterized in that... It includes a pipe shell body, on which a heat-insulating pipe shell structure based on phenolic foam as described in any one of claims 1-9 is provided.