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Heat preservation pipe and combination method for combining foamed polyurethane spraying with outer protective pipe winding

A technology of polyurethane and outer protective pipes, which is applied in the direction of heat preservation, heat insulation protection of pipes, pipes/pipe joints/pipe fittings, etc. It can solve the problems of material differences, manufacturing process differences, etc., and achieve sustainability, life synchronization and prolongation The effect of service life

Pending Publication Date: 2019-04-16
HARBIN LOGSTOR ENERGY SAVING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem in the prior art that the polyurethane foam insulation layer and the pre-manufactured outer protective pipe are integrated with each other due to material differences and differences in manufacturing processes, and cannot be tightly combined with each other

Method used

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  • Heat preservation pipe and combination method for combining foamed polyurethane spraying with outer protective pipe winding
  • Heat preservation pipe and combination method for combining foamed polyurethane spraying with outer protective pipe winding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A thermal insulation pipe combined with spray-foamed polyurethane and a wound outer protective tube, comprising: a thermal insulation tube 1, the thermal insulation tube includes a working tube 2, and a polyurethane thermal insulation layer 3 is installed on the outer diameter of the working tube, The outer side of the polyurethane insulation layer is sprayed with a coating of polyethylene particles 4 through a spray gun, and the polyethylene particles are uniformly inlaid into the outer layer of the polyurethane insulation layer, and the inlay depth is 0.5-1 mm. The polyethylene outer protective tube 5 is wound on the outside of the ethylene particles.

Embodiment 2

[0020] According to the thermal insulation pipe combined with sprayed foamed polyurethane and winding outer protective tube described in Example 1, the polyurethane thermal insulation layer is a polyurethane plastic foam thermal insulation layer, and its working state is a soft state, and the polyethylene particles are not Regular granular structure, its surface is non-smooth, non-spherical polygonal pulverized material, particle size is 0.5-3 mm, the temperature when the polyethylene outer protective tube is wound is 200-230 degrees, the working tube The caliber is DN200-2000mm.

Embodiment 3

[0022] According to the method for combining the polyurethane foamed by spraying and the thermal insulation pipe wrapped around the outer protective pipe described in embodiment 1-4, the method may further comprise the steps:

[0023] (1) First install the working tube on the special equipment, and spray the foamed polyurethane insulation layer on the outer diameter of the working tube as the working tube rotates at a constant speed, and then use a spray gun to evenly spray polyethylene particles on the polyurethane For the outer layer of the insulation layer, before using the spray gun, adjust the pressure of the spray gun so that the polyethylene particles sprayed out are inlaid in the outer layer of the polyurethane insulation layer and the inlay depth reaches 0.5-1 mm, forming a fusion of polyurethane and polyethylene bridging substances layer;

[0024] (2) Then tightly wrap the polyethylene outer protective tube with a temperature of 200-230 degrees on the outside of the ...

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Abstract

The invention provides a heat preservation pipe and a combination method for combining foamed polyurethane spraying with outer protective pipe winding. At present, a pipe-in-pipe technology is used for heat preservation pipe manufacturing, a polyurethane plastic foam heat preservation layer and a pre-manufactured outer protective pipe are independent and cannot be closely combined due to materialand manufacturing difference, the two materials are subjected to phase change independently due to heat expansion and cold contraction caused by temperature change, and accordingly a three-in-one structure needed by the heat preservation pipe technology cannot be realized. The heat preservation pipe comprises a heat preservation pipe body (1), the heat preservation pipe body comprises a working pipe (2), a polyurethane heat preservation layer (3) is arranged on the outer diameter portion of the working pipe, a coating of polyethylene particles (4) is sprayed on the outer side of the polyurethane heat preservation layer through a spraying gun, the polyethylene particles are uniformly embedded in the outer layer of the polyurethane heat preservation layer, the embedding depth is 0.5-1 mm, and a polyethylene outer protective pipe (5) is wound on the outer side of the polyethylene particles. The heat preservation pipe is used for combining foamed polyurethane spraying with outer protectivepipe winding.

Description

Technical field: [0001] The invention relates to the field of energy transmission pipelines for heating, cooling, petroleum and petrochemical, ships, etc., in particular to a thermal insulation pipe combined with sprayed and foamed polyurethane and a wound outer protective pipe and a combining method. Background technique: [0002] The structure of the prefabricated thermal insulation pipeline is divided into three parts, which are polyethylene outer protection tube, polyurethane insulation layer, and working pipeline; in the manufacturing process of the insulation pipe, at present, all of my country adopts the pipe-in-pipe process, because the polyurethane plastic foam insulation layer and the pre-manufactured Due to differences in materials and manufacturing processes among the outer protective tubes, they are integrated with each other and cannot be tightly combined with each other. During the use of the insulation pipe, due to thermal expansion and contraction caused by t...

Claims

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Application Information

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IPC IPC(8): F16L59/02F16L59/10B29C44/02B29C44/12B29C41/08B29C41/20B29C53/56
CPCF16L59/028B29C41/08B29C41/20B29C44/02B29C44/12B29C53/566F16L59/029F16L59/10
Inventor 王辉赖贞澄张居山
Owner HARBIN LOGSTOR ENERGY SAVING TECH
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