Fire resistant, thermally insulated polyethylene pipe

Abstract

This utility model relates to the field of polyethylene pipe technology, specifically disclosing a fireproof and heat-insulating polyethylene pipe, including an inner pipe layer. The outer wall of the inner pipe layer is co-extruded and composited from the inside to the outside, forming an inner flame-retardant layer, a heat-insulating layer, a reflective layer, and an outer fireproof protective layer. Both the inner flame-retardant layer and the outer fireproof protective layer are flame-retardant composite material layers, and the reflective layer is a high-reflectivity material layer. Through a multi-layer composite structure, it integrates pressure-bearing transportation, bidirectional flame retardancy, high-efficiency heat insulation, and radiation reflection functions into one, solving the various drawbacks of traditional pipes that require subsequent wrapping construction. It achieves inherent fire resistance and self-insulation of the pipe product, significantly improving the long-term safety, reliability, and energy-saving benefits of building pipeline systems. At the same time, it simplifies the installation process, reduces overall costs, and is safer and more environmentally friendly due to the selection of environmentally friendly materials and halogen-free flame-retardant properties.

Description

Technical Field

[0001] This utility model relates to the field of polyethylene pipe technology, and specifically discloses a fireproof and heat-insulating polyethylene pipe. Background Technology

[0002] Polyethylene pipes are widely used in building water supply, heating, and fluid transportation due to their advantages such as corrosion resistance, low fluid resistance, light weight, good flexibility, and long service life. Among them, heat-resistant polyethylene (PE-RT) pipes, due to their high-temperature resistance, have become one of the preferred pipe materials for low-temperature radiant floor heating systems. However, traditional polyethylene pipes still have significant functional defects in practical applications due to the inherent limitations of the material itself.

[0003] Currently, to meet higher requirements for building energy conservation and fire safety, dual standards have been set for the thermal insulation and fire-retardant properties of pipe materials. Existing ordinary polyethylene pipes cannot simultaneously meet both requirements, typically necessitating the addition of external insulation and fire-retardant materials after installation. This subsequent construction method not only increases project complexity and cost but also has many inherent drawbacks: the extra construction reduces efficiency, the outer material is prone to damage and detachment affecting long-term performance, and the fire-resistant sealing and durability of the entire pipeline system cannot be reliably guaranteed. Utility Model Content

[0004] This utility model proposes a fireproof and heat-insulating polyethylene pipe that integrates pressure-bearing, bidirectional flame retardancy, high-efficiency heat insulation, and radiation reflection functions through a multi-layer composite structure, thus solving the various drawbacks of traditional pipes that require subsequent wrapping construction.

[0005] This utility model is implemented as follows: a fireproof and heat-insulating polyethylene pipe includes an inner pipe layer. The outer wall of the inner pipe layer is co-extruded and composited from the inside to the outside to form an inner flame-retardant layer, a heat-insulating layer, a reflective layer, and an outer fireproof protection layer. The inner flame-retardant layer and the outer fireproof protection layer are both flame-retardant composite material layers, and the reflective layer is a high-reflectivity material layer.

[0006] As a preferred embodiment of the fireproof and heat-insulating polyethylene pipe of this utility model, the inner pipe layer is made of heat-resistant polyethylene.

[0007] As a preferred embodiment of the fireproof and heat-insulating polyethylene pipe of this utility model, the inner flame-retardant layer is made of halogen-free flame-retardant polyethylene.

[0008] As a preferred embodiment of the fireproof and heat-insulating polyethylene pipe of this utility model, the heat insulation layer is made of microporous foamed polyethylene, and the outer fireproof protective layer is made of halogen-free flame-retardant polypropylene.

[0009] As a preferred embodiment of the fireproof and heat-insulating polyethylene pipe of this utility model, the reflective layer is one of aluminum foil and aluminized polyester film.

[0010] As a preferred embodiment of the fireproof and heat-insulating polyethylene pipe of this utility model, the thickness of the outer fireproof protective layer is greater than the thickness of the heat insulation layer.

[0011] As a preferred embodiment of the fireproof and heat-insulating polyethylene pipe of this utility model, the outer surface of the outer fireproof protective layer is provided with an outwardly protruding marking line.

[0012] The beneficial effects of this utility model are:

[0013] Through a multi-layered composite structure, it integrates pressure-bearing, bidirectional flame retardancy, high-efficiency heat insulation, and radiation reflection functions into one, solving the various drawbacks of traditional pipes that require subsequent wrapping construction. It achieves inherent fire resistance and self-insulation of the pipe product, significantly improving the long-term safety, reliability, and energy-saving benefits of building pipeline systems. At the same time, it simplifies the installation process, reduces overall costs, and is safer and more environmentally friendly due to the selection of environmentally friendly materials and halogen-free flame retardant properties. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0015] Figure 1 This is a cross-sectional view of the present invention.

[0016] Figure 2 This is a diagram of the overall external structure of this utility model.

[0017] The markings in the diagram are: 1. Inner pipe layer; 2. Inner flame retardant layer; 3. Heat insulation layer; 4. Reflective layer; 5. Outer fireproof protection layer; 6. Marking line. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0019] Please see Figure 1-2 A fireproof and heat-insulating polyethylene pipe includes an inner pipe layer 1. The outer wall of the inner pipe layer 1 is co-extruded and composited from the inside to the outside with an inner flame-retardant layer 2, a heat-insulating layer 3, a reflective layer 4, and an outer fireproof protection layer 5. The inner flame-retardant layer 2 and the outer fireproof protection layer 5 are both flame-retardant composite material layers, and the reflective layer 4 is a high reflectivity material layer.

[0020] In this embodiment: the inner flame-retardant layer 2 is made of halogen-free flame-retardant polyethylene, which promotes surface charring and isolates oxygen when exposed to fire, achieving high flame retardancy and not releasing toxic or corrosive hydrogen halide gas during combustion, making it safer and more environmentally friendly. The insulation layer 3 is made of microporous foamed polyethylene, and the outer fireproof protective layer 5 is made of halogen-free flame-retardant polypropylene. This combines the extremely low thermal conductivity of the closed-cell foam structure with the good rigidity and flame-retardant modification compatibility of halogen-free flame-retardant polypropylene, ensuring optimal thermal insulation performance while giving the outermost layer excellent mechanical strength, durability, and fire resistance. The reflective layer 4 is either aluminum foil or aluminized polyester film, utilizing the high reflectivity of metallic materials to specifically reflect infrared radiation heat. The outer fireproof protective layer 5 complements the heat insulation layer 3's anti-conductivity properties, thus blocking heat transfer in all directions and greatly improving heat insulation efficiency. The outer fireproof protective layer 5 is thicker than the heat insulation layer 3, giving the outermost layer of the pipe a thicker protective thickness to cope with complex physical impacts and longer flame erosion, significantly enhancing the overall mechanical protection capability of the pipe body. The outer surface of the outer fireproof protective layer 5 is provided with outwardly protruding marking lines 6, providing wear-resistant and weather-resistant permanent markings that are easy to identify and also have anti-counterfeiting functions. At the same time, the raised structure does not easily trap dirt. This composite structure allows the pipe to meet both extremely high fire safety standards and excellent heat insulation and energy-saving requirements without any secondary construction or wrapping.

[0021] As a technical optimization of this utility model, the inner tube layer 1 is made of heat-resistant polyethylene.

[0022] In this embodiment, the excellent temperature creep resistance and long-term hydrolysis resistance of heat-resistant polyethylene material are utilized to ensure that the pipe can maintain stable pressure resistance and structural integrity under long-term transportation of high-temperature and high-pressure heat medium, which significantly broadens the application range of the pipe, especially heating systems, and extends its service life.

[0023] As a technical optimization of this utility model, the inner flame-retardant layer 2 is made of halogen-free flame-retardant polyethylene.

[0024] In this embodiment, the inner flame-retardant layer 2 is made of halogen-free flame-retardant polyethylene, which promotes charring on the surface and isolates oxygen when exposed to fire, achieving high flame retardancy and not releasing toxic and corrosive hydrogen halide gas during combustion, making it safer and more environmentally friendly.

[0025] As a technical optimization of this utility model, the insulation layer 3 is made of microporous foamed polyethylene, and the outer fireproof protection layer 5 is made of halogen-free flame-retardant polypropylene.

[0026] In this embodiment, the combination of the extremely low thermal conductivity of the closed-cell foam structure and the good rigidity and flame-retardant modification compatibility of the halogen-free flame-retardant polypropylene material ensures optimal thermal insulation performance while giving the outermost layer excellent mechanical strength, durability and fire resistance.

[0027] As a technical optimization of this utility model, the reflective layer 4 is one of aluminum foil and aluminized polyester film.

[0028] In this embodiment, the high reflectivity of the metal material is used to specifically reflect infrared radiation heat, which complements the anti-conduction properties of the insulation layer 3, thereby blocking heat transfer in different forms in all directions and greatly improving the insulation efficiency.

[0029] As a technical optimization of this utility model, the thickness of the outer fireproof protective layer 5 is greater than the thickness of the heat insulation layer 3.

[0030] In this embodiment, the thickness of the outer fireproof protective layer 5 is greater than the thickness of the heat insulation layer 3, giving the outermost layer of the pipe a thicker protective thickness to cope with complex physical impacts and longer flame erosion, significantly enhancing the overall mechanical protection capability of the pipe body.

[0031] As a technical optimization of this utility model, the outer surface of the outer fireproof protective layer 5 is provided with an outwardly protruding marking line 6.

[0032] In this embodiment: the outer surface of the outer fireproof protective layer 5 is provided with an outwardly protruding identification line 6, which provides a wear-resistant and weather-resistant permanent identification that is easy to identify and also has an anti-counterfeiting function. At the same time, the raised structure is not easy to trap dirt.

[0033] The working principle and usage process of this utility model are as follows: When the pipe is in operation, the fluid medium being transported flows in the inner pipe layer 1, and the heat is first blocked by the inner pipe layer 1; when the internal temperature is abnormal or when it encounters fire, the inner flame-retardant layer 2 quickly takes effect, effectively delaying or preventing thermal decomposition and the spread of flames inward through the flame-retardant mechanism, while preventing the internal flames from spreading outward; the heat insulation layer 3 utilizes its closed microporous structure filled with air to form a highly efficient heat conduction barrier, greatly slowing down the conduction speed of heat from the inside to the outside or from the outside to the inside; the reflective layer 4 mainly defends against heat radiation, and its smooth, highly reflective surface reflects most of the infrared radiation waves carrying heat back, preventing radiant heat from penetrating; the outermost fireproof protective layer 5 serves as the final line of defense, directly withstanding external mechanical impact and flame burning, and its flame-retardant components expand and carbonize under flame to form a dense carbon layer, isolating oxygen and protecting the integrity of the internal structure.

[0034] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0035] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A fire-resistant and heat-insulating polyethylene pipe, comprising an inner pipe layer (1), characterized in that: The outer wall of the inner tube layer (1) is co-extruded from the inside to the outside to form an inner flame retardant layer (2), a heat insulation layer (3), a reflective layer (4) and an outer fireproof protection layer (5). The inner flame retardant layer (2) and the outer fireproof protection layer (5) are both flame retardant composite material layers, and the reflective layer (4) is a high reflectivity material layer.

2. The fireproof and heat-insulating polyethylene pipe according to claim 1, characterized in that: The inner tube layer (1) is made of heat-resistant polyethylene.

3. The fireproof and heat-insulating polyethylene pipe according to claim 1, characterized in that: The inner flame retardant layer (2) is made of halogen-free flame retardant polyethylene.

4. The fireproof and heat-insulating polyethylene pipe according to claim 1, characterized in that: The insulation layer (3) is made of microporous foamed polyethylene, and the outer fireproof protection layer (5) is made of halogen-free flame-retardant polypropylene.

5. The fireproof and heat-insulating polyethylene pipe according to claim 1, characterized in that: The reflective layer (4) is one of aluminum foil and aluminized polyester film.

6. The fireproof and heat-insulating polyethylene pipe according to claim 1, characterized in that: The thickness of the outer fireproof protective layer (5) is greater than the thickness of the heat insulation layer (3).

7. The fireproof and heat-insulating polyethylene pipe according to claim 1, characterized in that: The outer surface of the outer fireproof protective layer (5) is provided with an outwardly protruding marking line (6).

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