Polyurethane spraying outer protection pipe spraying integrally-formed prefabricated heat preservation valve and spraying method

Abstract

The invention discloses a polyurethane spraying outer protection pipe spraying integrally-formed prefabricated heat preservation valve and a spraying method. By adopting a traditional prefabricated directly-buried heat preservation process, a heat supply pipe network and a pipeline valve have the disadvantages of uneven heat preservation forming, halfway splicing and welding of an outer protectionpipe, great heat loss for integral heat preservation and short service life of a heat preservation valve. The heat preservation valve comprises a prefabricated directly-buried heat preservation valvewhich comprises a working pipe, wherein polyurethane protection layers (3) are sprayed to the outer layers of a horizontal pipe and a vertical pipe of the working pie separately through a polyurethane mixing spray head (6), valve welding ports (1) without the polyurethane protection layer are left at two ends of the horizontal pipe, high polymer liquid protection layers (4) are sprayed to the outer surfaces of the polyurethane protection layers by a high pressure spray gun, a group of alarm lines (2) is mounted in each polyurethane protection layer, and the high polymer liquid protection layers are made of high polymer liquid elastic materials with densities being 1.2 q/cm<3> and the coatings are 1-20 mm thick. The invention relates to the polyurethane spraying outer protection pipe spraying integrally-formed prefabricated heat preservation valve.

Description

Technical field:[0001]The invention relates to the technical field of heating pipe networks and conveying pipelines, in particular to a prefabricated thermal insulation valve formed by spraying a polyurethane spraying outer protective pipe and a spraying method.Background technique:[0002]At present, the domestic heating pipe network and oil and gas pipeline valves generally use the traditional prefabricated direct buried insulation technology. First, an outer protective pipe larger than the valve shape is made according to the valve shape. The outer protective pipe is made of polyethylene pipe products. The polyethylene pipe is cut according to the shape of the outer protective pipe, and then the cut polyethylene pipe is welded by a plastic welding process. Finally, the space between the outer body of the valve and the manufactured outer protective pipe is poured with polyurethane foaming agent to form heat preservation The valve structure, this manufacturing process has certain def...

AI Technical Summary

Problems solved by technology

[0002] At present, the domestic heating pipe network and oil and gas pipeline valves generally adopt the traditional prefabricated direct-buried thermal insulation process. First, an outer protection pipe with a volume larger than the valve shape is made according to the shape of the valve. The outer protection pipe is made of polyethylene pipe products. Cut the polyethylene pipe according to the shape of the outer protective pipe, then use the plastic welding process to weld the cut polyethylene pipe, and finally pour polyurethane foaming agent into the concentric space between the outer body of the valve and the manufactured outer protective pipe to form insulation Valve structure, this manufacturing process has certain defects, such as uneven insulation and foaming, incomplete splicing and welding of outer protection pipes, inability to install and manufacture on site, etc., there may be a huge heat loss in the overall insulation performance, and the use of insulation valves The service life is short and there is no effective insulation protection, so this kind of old-fashioned prefabricated direct-buried insulation valve has great technical problems in terms of energy saving, environmental protection and economic benefits.

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