High-density polyethylene vacuum thermal insulation pipe

Abstract

The utility model relates to a high-density polyethylene vacuum thermal insulation pipe, which comprises a plurality of thermal insulation pipe units, and is characterized in that two ends of an outer pipe are respectively provided with an annular hot melting joint, the outer pipes of two adjacent thermal insulation pipe units are connected through the annular hot melting joints, and the outer diameter of the annular hot melting joints is equal to that of the outer pipes. The inner diameter of the annular hot melting connector is equal to the inner diameter of the inner pipe, concentric annular grooves corresponding to the annular heat preservation cavities are formed in the end faces of the two sides of the annular hot melting connector respectively, electric melting sleeves are arranged on the outer sides of the butt joint sections of the outer pipes of every two adjacent heat preservation pipe units, and resistance wires used for strengthening the pulling force of electric melting openings are distributed on the inner walls of the electric melting sleeves. A vacuumizing hole communicated with the annular heat preservation cavity is formed in the outer wall of the outer pipe, a plug is arranged at the position of the vacuumizing hole, and inert gas or heat insulation materials are injected into the annular heat preservation cavity. Under the condition that the connecting strength of adjacent pipelines is guaranteed, the connecting structure is small in outer diameter, wide in application range, good in heat preservation effect and large in effective passage proportion of the cross sections of the pipelines.

Description

Technical Field

[0001] The utility model relates to a high-density polyethylene thermal insulation pipe, in particular to a high-density polyethylene vacuum thermal insulation pipe suitable for the fields of petrochemical industry and the like. Background Art

[0002] Polyethylene is a thermoplastic resin made by polymerizing ethylene. It is usually used in insulation pipes to enhance the thermal insulation performance and protective effect of the pipes.

[0003] For example, CN 221424134 U discloses a high-density polyethylene insulated pipe, which includes an outer pipe and an inner pipe, a spacer is provided between the inner pipe and the outer pipe, a first support member is fixedly connected to the inner wall of the spacer, and the other end of the first support member is fixedly connected to the outer wall of the inner pipe. By providing a spacer, a first support member and a second support member between the outer pipe and the inner pipe, it plays a role of reinforcing support between the inner and outer pipes, aiming to improve the pressure resistance, and at the same time adopts a first foam insulation layer and a second foam insulation layer, aiming to improve the insulation effect. However, there are the following problems: 1. The two ends of the pipe are connected to the adjacent pipes by flanges to maintain the connection strength, but they are not suitable for use in narrow spaces; 2. In order to ensure the insulation performance, the effective passage ratio of the pipe cross section is small, which is not conducive to use. Utility Model Content

[0004] The purpose of the utility model is to provide a high-density polyethylene vacuum insulation pipe with a reasonable structure and reliable use to solve the above problems. While ensuring the connection strength of adjacent pipelines, the connection structure has a small outer diameter, a wide range of applications, good insulation effect, and a large proportion of the effective path of the pipeline cross section.

[0005] The technical solution of the utility model is:

[0006] A high-density polyethylene vacuum insulation pipe comprises a plurality of insulation pipe units, each insulation pipe unit comprises an outer pipe and an inner pipe coaxial with the outer pipe, an annular insulation cavity is provided between the inner pipe and the outer pipe, and the technical key points are: annular heat-melt joints are respectively provided at both ends of the outer pipe, the outer pipes of two adjacent insulation pipe units are connected by annular heat-melt joints, the outer diameter of the annular heat-melt joint is equal to the outer diameter of the outer pipe, the inner diameter of the annular heat-melt joint is equal to the inner diameter of the inner pipe, the end faces of both sides of the annular heat-melt joint are respectively provided with concentric annular grooves corresponding to the annular insulation cavity, an electric fusion sleeve is provided on the outer side of the outer pipe butt joint section of the adjacent two insulation pipe units, the inner wall of the electric fusion sleeve is provided with a resistance wire for strengthening the tensile force of the electric fusion mouth, a vacuum hole connected to the annular insulation cavity is provided on the outer wall of the outer pipe, a plug is provided at the vacuum hole, and inert gas or insulation material is injected into the annular insulation cavity.

[0007] In the above-mentioned high-density polyethylene vacuum insulation pipe, the distance between the inner tube and the outer tube is 2.5 mm.

[0008] The above-mentioned high-density polyethylene vacuum insulation pipe, the outer pipe, inner pipe, annular hot-melt joint and electric-melt sleeve are respectively made of PE-RT pipe materials.

[0009] The above-mentioned high-density polyethylene vacuum insulation pipe, the thermal insulation material is polyurethane.

[0010] In the above-mentioned high-density polyethylene vacuum insulation tube, the inert gas is argon.

[0011] The beneficial effects of the utility model are:

[0012] 1. When in use, first evacuate the annular insulation cavity, and then inject inert gas or heat insulation effect into the annular insulation cavity according to user needs to enhance the insulation performance. The effective passage ratio of the pipe cross section is large, which increases the medium flow and is conducive to use.

[0013] 2. The outer tubes of two adjacent insulation pipe units are connected using an annular heat-melt joint, and then the outer tubes of the two adjacent insulation pipe units are reinforced with an electric fusion sleeve to achieve the purpose of connecting the two insulation pipe units. The outer diameter is small, the tensile strength is strong, and the use strength is high. While ensuring the connection strength of adjacent pipes, the connection structure has a small outer diameter and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 yes Figure 1 A partial enlarged view of

[0016] Figure 3 This is a schematic structural diagram of the annular heat-melt joint of the present invention;

[0017] Figure 4 It is a structural schematic diagram of the plug of the utility model.

[0018] In the figure: 1. electric fusion sleeve, 2. outer tube, 3. plug, 4. vacuum box, 5. inner tube, 6. annular hot-melt joint, 7. resistance wire, 8. concentric annular groove. DETAILED DESCRIPTION

[0019] The utility model is described in detail according to the accompanying drawings.

[0020] like Figures 1 to 4 As shown, the high-density polyethylene vacuum insulation pipe comprises a plurality of insulation pipe units. Each insulation pipe unit comprises an outer pipe 2 and an inner pipe 5 coaxial with the outer pipe 2, wherein an annular insulation cavity is provided between the inner pipe 5 and the outer pipe 2.

[0021] Wherein: an annular heat-melt joint 6 is provided at each end of the outer tube 2, and the outer tubes 2 of two adjacent insulation tube units are connected by the annular heat-melt joint 6. The outer diameter of the annular heat-melt joint 6 is equal to the outer diameter of the outer tube 2, and the inner diameter of the annular heat-melt joint 6 is equal to the inner diameter of the inner tube 5. The end faces of both sides of the annular heat-melt joint 6 are respectively provided with concentric annular grooves 8 corresponding to the annular insulation cavity. An electric fusion sleeve 1 is provided on the outside of the butt joint section of the outer tube 2 of two adjacent insulation tube units, and the inner wall of the electric fusion sleeve 1 is provided with a resistance wire 7 for strengthening the pulling force of the electric fusion port. A vacuum hole connected to the annular insulation cavity is provided on the outer wall of the outer tube 2, and a plug 3 is provided at the vacuum hole.

[0022] The annular insulation chamber is filled with an inert gas or thermal insulation material. In this embodiment, the spacing between the inner tube 5 and the outer tube 2 is 2.5 mm. The thermal insulation material is polyurethane. The inert gas is argon. The outer tube 2, inner tube 5, annular hot-melt joint 6, and electric fusion sleeve 1 are each made of PE-RT pipe. The plug 3 is made of PE material.

[0023] Working principle:

[0024] During use, the annular insulation cavity is first evacuated using a vacuum pump and vacuum box 4. Argon or polyurethane is then injected into the annular insulation cavity according to user requirements to enhance insulation performance. The outer tubes 2 of two adjacent insulation pipe units are connected and fixed together using an electric fusion sleeve 1, thereby achieving the purpose of connecting the two insulation pipe units. The small outer diameter and strong tensile strength provide high strength in use.

[0025] The above detailed description of the embodiments of the present invention is intended to be a preferred embodiment of the present invention and should not be construed as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made within the scope of the present invention shall still fall within the scope of this patent.

Claims

1. A high-density polyethylene vacuum insulation pipe, comprising a plurality of insulation pipe units, each insulation pipe unit comprising an outer pipe and an inner pipe coaxial with the outer pipe, an annular insulation cavity being provided between the inner and outer pipes, characterized in that: Annular heat-melt joints are respectively provided at both ends of the outer tube, and the outer tubes of two adjacent insulation tube units are connected by means of annular heat-melt joints. The outer diameter of the annular heat-melt joint is equal to the outer diameter of the outer tube, and the inner diameter of the annular heat-melt joint is equal to the inner diameter of the inner tube. The end faces of both sides of the annular heat-melt joint are respectively provided with concentric annular grooves corresponding to the annular insulation cavity. An electric fusion sleeve is provided on the outer side of the butt joint section of the outer tubes of the two adjacent insulation tube units. The inner wall of the electric fusion sleeve is provided with a resistance wire for strengthening the pulling force of the electric fusion mouth. A vacuum hole connected to the annular insulation cavity is provided on the outer wall of the outer tube, and a plug is provided at the vacuum hole. Inert gas or insulation material is injected into the annular insulation cavity.

2. The high-density polyethylene vacuum insulation pipe according to claim 1, characterized in that: The distance between the inner tube and the outer tube is 2.5 mm.

3. The high-density polyethylene vacuum insulation pipe according to claim 1, characterized in that: The outer pipe, inner pipe, annular hot-melt joint and electric-melt sleeve are respectively made of PE-RT pipe materials.

4. The high-density polyethylene vacuum insulation pipe according to claim 1, characterized in that: The thermal insulation material is polyurethane.

5. The high-density polyethylene vacuum insulation pipe according to claim 1, characterized in that: The inert gas is argon.

Images