Rigid polyurethane insulation pipe containing polyurethane concentric device and manufacturing method

Abstract

The invention relates to a rigid polyurethane thermal insulation pipeline comprising polyurethane concentric devices and a manufacturing method. According to prefabricated direct-buried thermal insulation pipes manufactured domestically, the technological means that plastic supports, wood blocks and other materials are used as supporting concentric parts is adopted between outer protecting pipes and working pipelines; due to the adoption of the plastic supports and the wood blocks, the thermal insulation effect of polyurethane is destroyed invisibly, and the thermal insulation temperature of the polyurethane is decreased. The rigid polyurethane thermal insulation pipeline comprises the set of polyurethane concentric devices (3), and the set of polyurethane concentric devices (3) is fixed to the outer wall of a working pipe (4) through polyurethane adhesives; the polyurethane concentric devices are of regular block-shaped structures or C-shaped clamping sleeve structures and are fixed to the outer wall of the working pipe; the polyurethane concentric devices are sleeved with an outer protecting pipe (1); rigid polyurethane foaming agents (2) are poured among the outer protecting pipe, the working pipe and the polyurethane concentric devices. The manufacturing method is used for the rigid polyurethane thermal insulation pipeline comprising the polyurethane concentric devices.

Description

Technical field: [0001] The invention relates to the working field of energy delivery pipelines used in the fields of heating and cooling, in particular to a rigid polyurethane thermal insulation pipeline containing a polyurethane concentric device and a manufacturing method thereof. Background technique: [0002] At present, the domestic manufacturing of prefabricated direct-buried thermal insulation pipes basically adopts the pipe-in-pipe technology. Among them, plastic brackets, wood blocks and other materials are used as supporting concentric technical means between the outer protective pipe and the working pipe. According to the most advanced international thermal conductivity requirements , Both plastic and wood blocks have heat conduction function, but the use of plastic brackets and wood blocks virtually destroys the thermal insulation effect of polyurethane, reduces the thermal insulation temperature of polyurethane, and improves the thermal conductivity. This produ...

AI Technical Summary

Problems solved by technology

[0002] At present, the domestic manufacturing of prefabricated direct buried insulation pipes basically adopts the pipe-in-pipe technology, in which plastic brackets, wood blocks and other materials are used between the outer protection pipe and the working pipe As a technical means to support concentricity, according to the most advanced international thermal conductivity requirements, both plastic and wooden blocks have thermal conductivity, but the use of plastic brackets and wooden blocks virtually destroys the thermal insulation effect of polyurethane, reduces the thermal insulation temperature of polyurethane, and improves Thermal Conductivity

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