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

Abstract

The invention discloses a polyurethane spraying outer protection pipe spraying integrally-formed prefabricated heat preservation pipefitting and a spraying method. By adopting a traditional prefabricated directly-buried heat preservation process, an existing heat supply pipe network and a pipeline fitting have the disadvantages of uneven heat preservation forming, halfway splicing and welding of an outer protection pipe, great heat loss for integral heat preservation and short service life of a heat preservation pipefitting. The heat preservation pipefitting comprises a prefabricated directly-buried heat preservation pipefitting which comprises a working pipe (4), wherein a polyurethane protection layer (2) is sprayed to the outer surface of the working pipe through spraying equipment (5),valve welding ports without the polyurethane protection layer are left at two ends of the working pipe, high polymer liquid protection layers (1) are sprayed to the outer surfaces of the polyurethaneprotection layers by the spraying equipment, a group of alarm lines (3) is mounted in each polyurethane protection layer, and the high polymer liquid protection layers are made of high polymer liquidelastic 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 pipefitting.

Description

Technical field: [0001] The invention relates to the technical field of heating pipe networks and conveying pipes, in particular to a prefabricated heat-preserving pipe fitting and a spraying method for integrally forming a polyurethane spray-coated outer protection pipe. Background technique: [0002] At present, the domestic heating pipe network and oil and gas pipeline fittings generally adopt the traditional prefabricated direct-buried thermal insulation process. First, according to the shape of the pipe fittings, an outer protective pipe larger than the shape of the pipe fittings is made. The outer protective 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 space between the outer body of the pipe fitting and the outer protective pipe concentrically to form heat preservation ...

AI Technical Summary

Problems solved by technology

[0002] At present, the domestic heating pipe network and oil and gas pipeline fittings generally adopt the traditional prefabricated direct-buried thermal insulation process. First, according to the shape of the pipe fittings, an outer protective pipe larger than the shape of the pipe fittings is made. The outer protective 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 space between the outer body of the pipe fitting and the outer protective pipe concentrically to form heat preservation The structure of pipe fittings, this manufacturing process has certain defects, such as uneven insulation foaming, incomplete splicing and welding of outer protective pipes, and inability to install and manufacture on site, etc. There may be a huge heat loss in the overall insulation performance. The service life is short, and no effective insulation protection can be obtained. Therefore, this kind of old-fashioned prefabricated direct-buried thermal insulation pipe fittings has great technical problems in terms of energy saving, environmental protection and economic benefits.

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