Multi-wall interlayer hollow plastic heat preserving and cold insulating pipeline

Abstract

The invention discloses a multi-wall interlayer hollow plastic heat-insulation, cold insulation pipeline, which is composed of an inner pipe wall, a hollow pipe wall, an outer pipe wall which are connected through embedded rebars, and hollow heat-insulation layer arranged between the inner pipe wall, the hollow pipe wall and the outer pipe wall, characterized in that in the hollow heat-insulation layer, atmospheric pressure or negative pressure gases are used or heat-insulation material is filled as heat insulator; each pipe wall and the embedded rebars can be dipped, sprayed, or coated with low-emissivity mixing layer or a functional layer with low emissivity is extrudedly sticked to the inner pipe wall surface of the hollow heat-insulation layer; the outer pipe wall, the hollow pipe wall and the embedded rebars can be manufactured into rebars and walls mixed by plastics, aluminum powder and adsorption getter according to proportion; metal pipes can be embedded into the plastic inner pipe wall, linear expansion difference of which is melt by a compensator or a corrugated pipe; the cross section of the pipelines can be various shapes by using multi-wall composite pipe head extrusion processing or other molding technology; the pipeline is hot-melt by a using a hot-melt clamp, or secured by using a metal pipe outer wall nut and an inner wall nut and a connector, or uses connection method such as flange, cementation, welding or the like.

Description

【Technical field】 [0001] The invention relates to a pipe used for conveying cold and hot media in the fields of construction, chemical industry, petroleum and electric power, in particular to a hollow plastic heat-preservation and cold-preservation pipe between multi-wall layers. 【Background technique】 [0002] There are many types of plastic pipes, including single-wall pipes and double-wall pipes. Double-wall pipe In order to make the pipe diameter larger and the strength higher, a variety of models of double-wall series have been designed. The diversification of the pipe wall type is mostly considered from the aspects of improving the stress structure of the pipe wall and reducing the use of materials. Pipes are mostly used in non-pressurized drainage systems for buildings and infrastructure. At present, the plastic pipes that are widely used in construction and chemical industry to transport cold and hot media are single-wall plastic pipes. For single-wall plastic pip...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defect that the existing single and double-wall plastic pipes only use the poor heat preservation performance of the pipe wall, the present invention provides a multi-wall interlayer hollow plastic heat preservation and cold heat preservation pipe, which utilizes the limited space and the air has a small thermal conductivity, and when the Rayleigh criterion Ra When the value is less than 1700, the air cannot overcome the resistance of its own kinematic viscosity, and there is no natural convection heat transfer in the double-walled hollow tube wall, only the heat conduction of the air itself and the radiation heat transfer phenomenon of the tube wall

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