Multi-layer heat insulation and preservation pipe and device for machining same

Abstract

The invention discloses a multi-layer heat insulation and preservation pipe which comprises a pipe body. The pipe body comprises an inner layer pipe body and an outer layer pipe body; a gap layer is formed between the inner layer pipe body and the outer layer pipe body; a skeleton is arranged in the gap layer, and the two ends of the skeleton are connected with the inner layer pipe body and the outer layer pipe body respectively; dry root skeletons are arranged around the central axis of the pipe bodies at intervals, and containing through cavities are formed among the adjacent skeletons, theinner layer pipe body and the outer layer pipe body, and the containing through cavities are filled with heat insulation foaming materials; the pipe further comprises an end cover ring, and the end cover ring can cover the end of the pipe body; a plurality of protrusions are arranged on the end cover ring, and the protrusions are coated with rubber layers; the protrusions correspond to the containing through cavities one to one, and the protrusions can be in interference fit with the containing through cavities. The invention further discloses a device for machining the multi-layer heat insulation and preservation pipe. The pipe has the advantages of being good in heat insulation and flame retardance.

Description

technical field [0001] The invention relates to the technical field of pipes, in particular to a multi-layer heat-insulating pipe and a device for processing the multi-layer heat-insulating pipe. Background technique [0002] Insulation pipe is the abbreviation of heat insulation pipe. Insulation pipe is used for the transportation of liquid, gas and other media, and is widely used in petroleum, chemical industry, aerospace, central heating, central air conditioning, municipal and other fields. [0003] At present, the thermal insulation pipes circulating in the market include the following types. First, composite pipes, that is, a layer of thermal insulation layer is compounded on the traditional non-insulated pipes to achieve the effect of thermal insulation; second, the surface of the pipes is wrapped A layer of heat insulation material is applied to reduce the degree of heat exchange inside and outside the pipe, thereby achieving the purpose of heat insulation; third, in...

AI Technical Summary

Problems solved by technology

There are several problems in the preparation of thermal insulation pipes by coating: first, after the coating is cured, the thickness formed on the surface of the pipe body is usually thin, and the heat insulation effect is limited, which leads to a limited application range and cannot be applied to extreme sections; Second, the interface between the paint and the formed pipe body is limited, and it is difficult to improve the bonding effect such as crosslinking, which makes the paint easy to fall off from the surface of the pipe body, resulting in poor stability and short service life

This method has the following disadvantages: the process is complex, multiple extruders need to be equipped at the same time, the structure of the cavity of the die head is relatively high, the process parameter setting is cumbersome and difficult to control; due to the different viscosity and melting temperature of different resins, Resins with similar properties are often used for co-extrusion, and the material selection is limited; in addition, after molding, the pipe body is heavy, which is inconvenient for installation and transportation

In addition, the foaming gun is used to spray the foaming slurry into the pipe to make it foam and fill naturally, which has the disadvantage of poor filling uniformity

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