Steel-plastic composite high-temperature-resistant pipe

Abstract

The utility model relates to steel -plastic composite pipe technical field discloses a kind of steel-plastic composite high-temperature-resistant pipe, including composite pipe body, the composite pipe body includes inner layer pipe, middle layer pipe and outer layer pipe, the inner layer pipe is made of crosslinking polyethylene material, the middle layer pipe is made of metal material, the outer layer pipe is made of polyethylene material, heat expansion buffer assembly is arranged between the outer wall of middle layer pipe and the inner wall of outer layer pipe, and the heat expansion buffer mechanism includes annular sponge pad, and the outer wall of middle layer pipe is uniformly fixedly connected with annular sponge pad.In the utility model, by setting annular sponge pad on the outer wall of middle layer pipe, when middle layer pipe is heated and expanded, sponge pad absorbs the stress generated by thermal expansion, sponge pad is compressed, provides longitudinal and radial expansion space for metal layer, avoids that stress is directly transmitted to outer layer pipe, and the expansion cracking of outer layer pipe can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of steel-plastic composite pipe technology, and in particular to a steel-plastic composite high-temperature resistant pipe. Background Technology

[0002] Steel-plastic composite pipe is a composite pipe material with steel pipe as the base and inner and outer plastic composite layers. It combines the strength of metal with the corrosion resistance of plastic and is widely used in water supply and drainage, petrochemical, construction and other fields. It is an upgraded replacement product for traditional galvanized pipe.

[0003] Existing steel-plastic composite pipes do not have a thermal expansion buffer structure between the middle metal pipe and the outer polyethylene pipe. When the metal layer expands due to heat, the stress generated will be directly transmitted to the outer pipe. Since the expansion coefficients of metal and plastic are quite different, the outer pipe is prone to cracking. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a steel-plastic composite high-temperature resistant pipe, which aims to improve the existing steel-plastic composite pipe. It does not have a thermal expansion buffer structure between the middle metal pipe and the outer polyethylene pipe. When the metal layer is heated and expands, the stress generated will be directly transmitted to the outer pipe. Since the expansion coefficients of metal and plastic are very different, it is easy to cause the outer pipe to crack.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a steel-plastic composite high-temperature resistant pipe, comprising a composite pipe body, wherein the composite pipe body comprises an inner pipe, a middle pipe and an outer pipe, wherein the inner pipe is made of cross-linked polyethylene material, the middle pipe is made of metal material, the outer pipe is made of polyethylene material, and a thermal expansion buffer assembly is provided between the outer wall of the middle pipe and the inner wall of the outer pipe.

[0006] By adopting the above technical solution, the inner layer of cross-linked polyethylene significantly improves the heat resistance and mechanical strength of polyethylene, far exceeding the temperature resistance limit of ordinary polyethylene. The middle layer of metal support, such as steel or aluminum pipe, provides a rigid skeleton to prevent pipe deformation at high temperatures and also serves as a heat transfer medium. The outer layer of polyethylene has strong weather resistance and can resist ultraviolet aging, extending the service life of the pipe. This steel-plastic composite high-temperature resistant pipe achieves comprehensive performance improvement in terms of high temperature resistance, corrosion resistance, high strength, low heat loss, and long service life through the three-layer structure design of inner cross-linked polyethylene, middle metal, and outer polyethylene. By setting an annular sponge pad on the outer wall of the middle layer tube, the annular sponge pad has compression and rebound characteristics. When the middle layer tube is heated and expands, the sponge pad absorbs the stress generated by the thermal expansion and is compressed, providing longitudinal and radial expansion space for the metal layer, avoiding the direct transmission of stress to the outer layer tube, and thus preventing the outer layer tube from expanding and cracking.

[0007] Preferably, the thermal expansion buffer assembly includes multiple annular sponge pads, and the outer wall of the middle layer tube is uniformly and fixedly connected with the annular sponge pads, and the outer wall of the annular sponge pads is fixedly connected to the inner wall of the outer layer tube.

[0008] Preferably, the outer wall of the inner tube and the inner wall of the middle tube are bonded together by hot melt adhesive.

[0009] Preferably, the outer wall of the outer tube is provided with scale markings.

[0010] This utility model has the following beneficial effects: 1. In this utility model, the inner layer of cross-linked polyethylene significantly improves the heat resistance and mechanical strength of polyethylene, far exceeding the temperature resistance limit of ordinary polyethylene. The middle layer of metal support, such as steel or aluminum pipe, provides a rigid skeleton to prevent pipe deformation at high temperatures and also serves as a heat transfer medium. The outer layer of polyethylene has strong weather resistance and can resist ultraviolet aging, extending the service life of the pipe. This steel-plastic composite high-temperature resistant pipe achieves comprehensive performance improvement in high temperature resistance, corrosion resistance, high strength, low heat loss, and long service life through the three-layer structure design of inner cross-linked polyethylene, middle metal, and outer polyethylene.

[0011] 2. In this utility model, an annular sponge pad is provided on the outer wall of the middle layer tube. The annular sponge pad has compression and rebound characteristics. When the middle layer tube is heated and expands, the sponge pad absorbs the stress generated by the thermal expansion and is compressed, providing longitudinal and radial expansion space for the metal layer, avoiding the direct transmission of stress to the outer layer tube, and thus preventing the outer layer tube from expanding and cracking. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of a steel-plastic composite high-temperature resistant pipe proposed in this utility model; Figure 2 This is a partial structural diagram of the middle layer of a steel-plastic composite high-temperature resistant pipe proposed in this utility model; Figure 3 This is a partial structural diagram of the outer tube of a steel-plastic composite high-temperature resistant pipe proposed in this utility model; Figure 4 This is a partial structural diagram of the annular sponge pad of a steel-plastic composite high-temperature resistant pipe proposed in this utility model.

[0013] Legend: 1. Composite tube body; 101. Inner tube; 102. Middle tube; 103. Outer tube; 2. Annular sponge pad; 3. Graduation markings. Detailed Implementation

[0014] 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, and 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.

[0015] Reference Figures 1-4 An embodiment of this utility model is provided: a steel-plastic composite high-temperature resistant pipe, including a composite pipe body 1. The composite pipe body 1 includes an inner pipe 101, a middle pipe 102 and an outer pipe 103. The inner pipe 101 is made of cross-linked polyethylene material, the middle pipe 102 is made of metal material, and the outer pipe 103 is made of polyethylene material. A thermal expansion buffer assembly is provided between the outer wall of the middle pipe 102 and the inner wall of the outer pipe 103.

[0016] Specifically, the inner cross-linked polyethylene layer significantly improves the heat resistance and mechanical strength of polyethylene, enabling it to operate stably for extended periods within a temperature range of -30℃ to 120℃, far exceeding the temperature limit of ordinary polyethylene. This makes it suitable for applications such as hot water supply and industrial high-temperature fluid transportation. The middle metal support layer, such as steel or aluminum pipe, provides a rigid framework to prevent pipe deformation at high temperatures. It also serves as a heat transfer medium, working in conjunction with a thermal expansion buffer mechanism to buffer thermal expansion. The outer polyethylene protection layer is highly weather-resistant, resisting UV aging and extending the pipe's service life. This steel-plastic composite high-temperature resistant pipe achieves comprehensive performance improvements in high temperature resistance, corrosion resistance, high strength, low heat loss, and long service life through its three-layer structure design: inner cross-linked polyethylene, middle metal, and outer polyethylene.

[0017] Reference Figures 2-4 The thermal expansion buffer assembly includes multiple annular sponge pads 2. The annular sponge pads 2 are uniformly fixedly connected to the outer wall of the middle tube 102, and the outer wall of the annular sponge pads 2 is fixedly connected to the inner wall of the outer tube 103.

[0018] Specifically, because the materials of the middle layer tube 102 and the outer layer tube 103 are different, their expansion rates differ after heating. If the middle layer tube 102 and the outer layer tube 103 are directly rigidly connected, when the middle layer tube 102 expands due to heat, it will generate compressive stress on the outer layer tube 103, which can easily lead to cracking of the outer layer tube 103. By setting an annular sponge pad 2 on the outer wall of the middle layer tube 102, the annular sponge pad 2 has compression and rebound characteristics. When the middle layer tube 102 expands due to heat, the sponge pad absorbs the stress generated by the thermal expansion and is compressed, providing longitudinal and radial expansion space for the metal layer, avoiding direct stress transmission to the outer layer tube 103, and preventing the outer layer tube 103 from expanding and cracking. Because there is a gap between the middle tube 102 and the outer tube 103, the air gap can effectively reduce the heat diffusion to the outer layer and achieve a better heat insulation effect.

[0019] Reference Figure 1 The outer wall of the inner tube 101 and the inner wall of the middle tube 102 are bonded together with hot melt adhesive, and the outer wall of the outer tube 103 is provided with scale marks 3.

[0020] Specifically, the outer wall of the outer pipe 103 is marked with scale lines 3 at fixed intervals. Construction workers can directly determine the pipe length by the markings without the need to use additional tools such as measuring tapes.

[0021] Working principle: The inner layer is cross-linked polyethylene: the cross-linking process significantly improves the heat resistance and mechanical strength of polyethylene, enabling it to operate stably for a long time in the range of -30℃ to 120℃, far exceeding the temperature resistance limit of ordinary polyethylene. It is suitable for hot water supply, industrial high-temperature fluid transportation and other scenarios. The middle layer is metal support: the metal layer, such as steel or aluminum pipe, provides a rigid skeleton to prevent pipe deformation at high temperatures. At the same time, it serves as a heat conduction medium and works with the thermal expansion buffer mechanism to achieve thermal expansion buffering. The outer layer is polyethylene protection: the outer polyethylene has strong weather resistance and can resist ultraviolet aging, extending the service life of the pipe. This steel-plastic composite high-temperature resistant pipe achieves comprehensive performance improvement in high temperature resistance, corrosion resistance, high strength, low heat loss and long service life through the three-layer structure design of inner cross-linked polyethylene, middle metal and outer polyethylene. Because the materials of the middle layer tube 102 and the outer layer tube 103 are different, their expansion rates differ after heating. If the middle layer tube 102 and the outer layer tube 103 are directly rigidly connected, the expansion of the middle layer tube 102 when heated will generate compressive stress on the outer layer tube 103, which may easily lead to cracking of the outer layer tube 103. By setting an annular sponge pad 2 on the outer wall of the middle layer tube 102, the annular sponge pad 2 has compression and rebound characteristics. When the middle layer tube 102 is heated and expanded, the sponge pad absorbs the stress generated by the thermal expansion and is compressed, providing longitudinal and radial expansion space for the metal layer, avoiding direct stress transmission to the outer layer tube 103, and thus preventing the expansion and cracking of the outer layer tube 103.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steel-plastic composite high-temperature resistant pipe, comprising a composite pipe body (1), characterized in that: The composite tube (1) includes an inner tube (101), a middle tube (102) and an outer tube (103). The inner tube (101) is made of cross-linked polyethylene material, the middle tube (102) is made of metal material, and the outer tube (103) is made of polyethylene material. A thermal expansion buffer assembly is provided between the outer wall of the middle tube (102) and the inner wall of the outer tube (103).

2. The steel-plastic composite high-temperature resistant pipe according to claim 1, characterized in that: The thermal expansion buffer assembly includes multiple annular sponge pads (2), and the outer wall of the middle tube (102) is uniformly fixedly connected with the annular sponge pads (2), and the outer wall of the annular sponge pads (2) is fixedly connected to the inner wall of the outer tube (103).

3. The steel-plastic composite high-temperature resistant pipe according to claim 1, characterized in that: The outer wall of the inner tube (101) and the inner wall of the middle tube (102) are bonded together by hot melt adhesive.

4. The steel-plastic composite high-temperature resistant pipe according to claim 1, characterized in that: The outer wall of the outer tube (103) is provided with scale markings (3).

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