High-density polyethylene gas pipe for gas

Abstract

The invention relates to the technical field of polyethylene pipes, and discloses a high-density polyethylene gas pipe for gas, the high-density polyethylene gas pipe comprises an inner layer, an outer layer and a wear-resistant layer, a corrosion-resistant layer is arranged between the inner layer and the outer layer, a protective layer is arranged between the outer layer and the wear-resistant layer, and a plurality of supporting pieces are arranged in the protective layer. According to the invention, through the arrangement of the double-layer composite polyethylene pipe, the high-wear-resistance effect is achieved; and the wear-resistant layer arranged outside further enhances the wear-resistant effect, and meanwhile, the filled heat preservation cotton plays an anti-freezing role on the polyethylene pipe, so that the problem that the pipe is corroded due to breakage is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of polyethylene pipes, in particular to a high-density polyethylene gas pipe for gas. Background Art

[0002] Polyethylene pipe is a pipe made of polyethylene, a highly crystalline, non-polar thermoplastic resin. The original polyethylene is milky white in appearance and somewhat translucent in thin sections. PE has excellent resistance to most household and industrial chemicals. Polyethylene has very good electrical properties, especially high dielectric strength of insulation, making it very suitable for wires and cables. Medium to high molecular weight grades have excellent impact resistance, both at room temperature and even at low temperatures of -40F.

[0003] In the prior art, polyethylene pipes used for gas pipes are easily affected by cold weather, which can lead to pipe wall rupture, exposing their internal structures that will soon be corroded by the external environment, causing gas pipeline leakage and safety accidents.

[0004] Therefore, based on the above technical problems, it is necessary for technicians in this field to develop a high-density polyethylene gas pipe for gas. Summary of the invention

[0005] The purpose of the present invention is to provide a high-density polyethylene gas pipe for gas, so as to solve the problem that the polyethylene pipe proposed in the above background technology is easily affected by cold weather and the pipe wall is easily broken, thereby exposing its internal structure and being quickly corroded by the external environment, causing pipeline leakage.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A technical solution for a high-density polyethylene gas pipe for gas, comprising an inner layer, an outer layer and a wear-resistant layer;

[0008] A corrosion-resistant layer is arranged between the inner layer and the outer layer, a protective layer is arranged between the outer layer and the wear-resistant layer, and a plurality of supporting members are arranged inside the protective layer.

[0009] As a preferred technical solution, the inner layer is a high molecular weight polyethylene layer, the outer layer is a common polyethylene layer, and the corrosion-resistant layer is a PE anti-corrosion layer.

[0010] As a preferred technical solution, the PE anti-corrosion layer includes extruded polyethylene, both ends of the extruded polyethylene are provided with epoxy coatings, and both sides of the epoxy coatings are provided with adhesives.

[0011] As a preferred technical solution, the wear-resistant layer includes a fiber woven layer, and the woven layer is filled with thermal insulation cotton.

[0012] As a preferred technical solution, the protective layer is a protective sleeve, a plurality of cavities are provided inside the protective sleeve, and each of the supporting members is a Y-shaped elastic structure and corresponds one-to-one to the plurality of cavities.

[0013] As a preferred technical solution, the outer surface of the protective layer is provided with a PE waterproof film, and the inner surface of the inner layer is provided with an antifreeze film.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The present invention is a high-density polyethylene gas pipe for gas, which is provided with a double-layer composite polyethylene pipe material, and has a high wear resistance; the wear-resistant layer provided on the outside further enhances the wear resistance effect, and at the same time, it is filled with thermal insulation cotton to prevent the polyethylene pipe material from freezing, thereby avoiding the problem of pipeline rupture and corrosion.

[0016] (2) The present invention is a high-density polyethylene gas pipe for gas, which is provided with a corrosion-resistant layer, which can improve the corrosion resistance of the polyethylene pipe. A composite structure is formed by a three-layer "hamburger-shaped" structure of epoxy coating-extruded polyethylene-epoxy coating and adhesive bonding to achieve better anti-corrosion effect.

[0017] (3) The present invention is a high-density polyethylene gas pipe for gas, which is provided with a protective layer structure, wherein the protective sleeve is sleeved on the surface of the polyethylene pipe, and the "head" and "foot" of the support are respectively connected to the side walls of the two ends of the cavity. When the polyethylene pipe is bent, the protective sleeve will bend together, and the protective sleeve will squeeze and stretch the Y-shaped elastic support members on both sides of the folded part respectively. The support member will generate tension on both sides of the cavity through its own elasticity, thereby preventing the polyethylene pipe from being over-folded and causing damage to the surface layer, thereby improving the stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the structure of a high-density polyethylene gas pipe for gas;

[0019] Figure 2 It is a three-dimensional schematic diagram of the corrosion-resistant layer of a high-density polyethylene gas pipe structure for gas;

[0020] Figure 3 It is a cross-sectional stereoscopic schematic diagram of a protective layer of a high-density polyethylene gas pipe structure for gas;

[0021] Figure 4 It is a three-dimensional schematic diagram of the wear-resistant layer of a high-density polyethylene gas pipe structure for gas.

[0022] In the accompanying drawings: 1, inner layer; 2, outer layer; 3, wear-resistant layer; 31, fiber woven layer; 32, thermal insulation cotton; 4, corrosion-resistant layer; 40, epoxy coating; 41, extruded polyethylene; 42, adhesive; 5, protective layer; 6, support; 7, PE waterproof membrane; 8, antifreeze membrane. DETAILED DESCRIPTION

[0023] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by illustrating examples of the present invention.

[0024] like Figure 1-4 As shown, the present invention provides a technical solution for a high-density polyethylene gas pipe for gas: it includes an inner layer 1, an outer layer 2 and a wear-resistant layer 3; a corrosion-resistant layer 4 is provided between the inner layer 1 and the outer layer 2, a protective layer 5 is provided between the outer layer 2 and the wear-resistant layer 3, and a plurality of support members 6 are provided inside the protective layer 5.

[0025] In this embodiment, the inner layer 1 and the outer layer 2 are the main parts of the high-density polyethylene pipe, and the wear-resistant layer 3 is used to increase the wear resistance of the polyethylene pipe. A corrosion-resistant layer 4 is arranged between the inner layer 1 and the outer layer 2. In the case that the outer layer 2 is frozen and cracked, the corrosion-resistant layer 4 on the surface of the inner layer 1 can be relied on to make the polyethylene pipe still have the ability to resist corrosion, thereby improving the corrosion resistance of the polyethylene pipe. A protective layer 5 and a support member 6 are added between the outer layer 2 and the wear-resistant layer 3 to cooperate with each other to enhance the structural stability of the polyethylene pipe and prevent the pipe from bending and breaking.

[0026] like Figure 1 As shown, the inner layer 1 is a high molecular weight polyethylene layer, the outer layer 2 is a common polyethylene layer, and the corrosion-resistant layer 4 is a PE anti-corrosion layer.

[0027] In this embodiment, the surface layer of the polyethylene pipe is made of ordinary polyethylene (HDPE) material, and the inner layer is made of ultra-high molecular weight polyethylene (UHMWPE). Due to the high molecular weight (molecular weight is usually above 1.5 million), ultra-high molecular weight polyethylene has excellent impact resistance, wear resistance, self-lubrication, corrosion resistance and other properties that are unmatched by other plastics. Moreover, ultra-molecular weight polyethylene has excellent low temperature resistance and still has high impact strength at -40 degrees, and can even be used at -269 degrees. In addition, the composite layer is made of polyethylene material, and a special molding process can be used to produce a cheap and high-wear-resistant polyethylene pipe. A corrosion-resistant layer 4 is set between the inner layer 1 and the outer layer 2 to avoid the problem that the surface of the outer layer 2 is easily scratched, thereby damaging the corrosion-resistant layer and causing the pipe to be easily corroded.

[0028] like Figure 2 As shown, the PE anti-corrosion layer includes extruded polyethylene 40, both ends of the extruded polyethylene 40 are provided with epoxy coating 41, and both sides of the epoxy coating 41 are provided with adhesive 42.

[0029] In this embodiment, the PE anti-corrosion layer is set as a three-layer "hamburger-shaped" structure of epoxy coating 41-extruded polyethylene 40-epoxy coating 41. The epoxy powder coating has a strong bonding force with the surface of the steel pipe to improve the adhesion. The extruded polyethylene 40 has excellent mechanical strength, chemical stability, insulation, resistance to plant root penetration, resistance to water penetration, etc. to improve its overall performance. Adhesive 42 is then used for bonding to form a composite structure to achieve better anti-corrosion effect.

[0030] like Figure 4 As shown, the wear-resistant layer 3 includes a fiber woven layer 31, and the interior of the woven layer is filled with thermal insulation cotton 32.

[0031] In this embodiment, a fiber braided layer 31 is added to the outer surface of the pipe to enhance the protection of the polyethylene pipe, and thermal insulation cotton 32 is filled in the fiber braided layer 31 to prevent the pipe from freezing and rupture, thereby further improving the antifreeze ability of the polyethylene pipe.

[0032] like Figure 3 As shown, the protective layer 5 is a protective sleeve, and a plurality of cavities are arranged inside the protective sleeve. Each support member 6 is a Y-shaped elastic structure and corresponds one-to-one to the plurality of cavities.

[0033] In this embodiment, the protective sleeve is sleeved on the surface of the polyethylene pipe, and the "head" and "foot" of the support member 6 are respectively connected to the side walls of the two ends of the cavity. When the polyethylene pipe is bent, the protective sleeve will bend together, and the protective sleeve will squeeze and stretch the Y-shaped elastic support members 6 on both sides of the folded part. The support member 6 will generate tension on both sides of the cavity through its own elasticity, avoiding excessive folding of the polyethylene pipe to cause damage to the surface, thereby improving the stability of the structure.

[0034] like Figure 1 As shown, the outer surface of the protective layer 5 is provided with a PE waterproof film 7, and the inner surface of the inner layer 1 is provided with an antifreeze film 8.

[0035] In this embodiment, the PE waterproof film 7 has a waterproof effect, and the wear-resistant layer 3 on the outside can prevent the PE waterproof film 7 from being scratched and broken. An antifreeze film 8 is added to the inner surface of the inner layer 1, so that the antifreeze film 8 directly wraps the internal material of the pipe, thereby enhancing the antifreeze effect.

[0036] Working principle of the present invention: Through the above-mentioned multi-layer structure design, the high-density polyethylene gas pipe for gas has excellent comprehensive performance in practical applications. Specifically, the ultra-high molecular weight polyethylene (UHMWPE) of the inner layer 1 provides excellent wear resistance and impact resistance, ensuring the stability and safety of the pipe in the process of transporting gas. The setting of the corrosion-resistant layer 4 effectively prevents the pipe from being corroded in harsh environments and prolongs the service life of the pipe.

[0037] The ordinary polyethylene (HDPE) material of the outer layer 2 provides good mechanical strength and chemical stability, while ensuring the flexibility and easy processing of the pipe. The combined design of the protective layer 5 and the support 6 not only improves the structural stability of the pipe, but also effectively prevents the pipe from being damaged due to external forces. The PE waterproof film 7 on the outer surface of the protective layer 5 and the antifreeze film 8 on the inner surface of the inner layer 1 further ensure the applicability of the pipe in different environments.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0039] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0041] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-density polyethylene gas pipe for gas, characterized in that: It comprises an inner layer (1), an outer layer (2) and a wear-resistant layer (3); A corrosion-resistant layer (4) is provided between the inner layer (1) and the outer layer (2), a protective layer (5) is provided between the outer layer (2) and the wear-resistant layer (3), and a plurality of supporting members (6) are provided inside the protective layer (5).

2. A high-density polyethylene gas pipe for gas according to claim 1, characterized in that: The inner layer (1) is a high molecular weight polyethylene layer, the outer layer (2) is a common polyethylene layer, and the corrosion-resistant layer (4) is a PE anti-corrosion layer.

3. A high-density polyethylene gas pipe for gas according to claim 2, characterized in that: The PE anti-corrosion layer comprises extruded polyethylene (40), both ends of the extruded polyethylene (40) are provided with epoxy coating (41), and both sides of the epoxy coating (41) are provided with adhesive (42).

4. A high-density polyethylene gas pipe for gas according to claim 1, characterized in that: The wear-resistant layer (3) comprises a fiber braided layer (31), and the braided layer is filled with thermal insulation cotton (32).

5. The high-density polyethylene gas pipe for gas according to claim 1, characterized in that: The protective layer (5) is a protective sleeve, and a plurality of cavities are arranged inside the protective sleeve. Each of the supporting members (6) is a Y-shaped elastic structure and corresponds one-to-one to the plurality of cavities.

6. A high-density polyethylene gas pipe for gas according to claim 1, characterized in that: The outer surface of the protective layer (5) is provided with a PE waterproof film (7), and the inner surface of the inner layer (1) is provided with an antifreeze film (8).

Images