CN2072181U

CN2072181U - Full-plastic prefabricated buried thermal insulation pipe

Info

Publication number: CN2072181U
Application number: CN 90214231
Authority: CN
Inventors: 黄昕
Original assignee: QILU PETROCHEMICAL DESIGN INST
Current assignee: QILU PETROCHEMICAL DESIGN INST
Priority date: 1990-08-15
Filing date: 1990-08-15
Publication date: 1991-02-27

Abstract

The utility model discloses a full-plastic prefabricated buried thermal insulation pipe which is compounded of a plastic conduit pipe (1), a hard polyurethane heat insulation layer (2), and a polyurethane elastic paint protecting layer (3). The full-plastic prefabricated buried thermal insulation pipe has the advantages of good thermal insulation performance, good waterproof performance, good corrosion-proof performance, high durability, convenient construction, convenient prefabrication, low construction cost, etc. The full-plastic prefabricated buried thermal insulation pipe is applied to buried heat supply pipelines.

Description

Full-plastic prefabricated buried thermal insulation pipe

The utility model belongs to a kind of direct-burried heat supply thermal insulation pipe.

The system of laying of heat supply pipeline can be built on stilts or trench, and directly buried installation is compared with the former two, and it has, and cost is low, construction is fast, take up an area of advantages such as few.So directly buried technology developed comparatively fast in recent years.But the biggest problem that direct buried pipe runs into is anticorrosion problem, often because protective layer cracking, and thermal insulation layer immersion and make heat insulation effect descend and make the conduit corrosion; Therefore, selecting corrosion resistant conduit and reliable protection layer is the key of this technology.

Through retrieval comprehensively, examination prior art, as No. 89201417.2 applications of Chinese patent, this application discloses a kind of direct-buried insulated pipe, and its conduit adopts steel pipe, and thermal insulation layer is a polyurethane, and protective layer adopts glass fibre reinforced plastics.Because glass fibre reinforced plastics breaks easily, makes pipeline life be affected.And for example, " District Heating in Denmark " reported a kind of heat supply pipeline in 1987, and its conduit is a polyethylene pipe, and thermal insulation layer is a foamed plastics, and protective layer is a low density polyethylene, and it only is applicable to small-bore heat supply pipeline.

The purpose of this utility model provides a kind of long-lived, novel heat insulation pipe of being convenient to factory's system of giving, easy construction.

Above-mentioned purpose adopts following design to realize that the utility model is made conduit with plastic tube, does thermal insulation layer with urethane foam; its thickness is generally the 20-50 millimeter; thermal insulation layer outer wall brushing one deck elastic polyurethane coating, to play water-tight and protective action, this coating thickness is 3 millimeters.This composite structure can give the type of making in factory easily, makes the thermal insulation pipe of certain-length; The assembled in situ construction can be adopted spigot-and-socket joint or flanged connecting structure, is coupled to pipeline with giving a section thermal insulation pipe that makes.The thermal insulation layer site operation of joint can adopt the mould of typing, and hard polyurethane foam stoste is injected the mould foaming with the casting type foaming machine, treat cure and demold after, brushing protective layer--elastic polyurethane coating.

The utility model has significant advantage than prior art, because conduit has adopted plastic tube, as everyone knows, plastic tube can anti-various acid, alkali, salt, therefore, conduit not only can the delivering hot water, also can carry various chemical liquids, and long service life, durable in use, in light weight, be convenient to the construction.The protective layer of prior art adopts pitch or glass fibre reinforced plastics (No. 89201417.2 applications) more, and these materials all lack stretchability, thereby; be easy to generate in the use and break; make the aggressive medium in the water and soil earth invade thermal insulation layer, reduced thermal insulation property, corroded steel pipe.The utility model adopts brushing elastic polyurethane coating; its performance of expanding with heat and contract with cold can be consistent with thermal insulation layer; thereby can be because of not expanding with heat and contract with cold or push cracking, and this protective layer is wear-resisting, strong adhesion has elasticity again, and can be owing to collision in carrying or the construction, rolling etc. cause damage.

Fig. 1 is the utility model structural drawing, and (1) is conduit among the figure, and (2) are thermal insulation layer, and (3) are protective layer.Fig. 2 is a thermal insulation pipe sectional view of the present utility model, and (1) is conduit among the figure, and (2) are thermal insulation layer, and (3) are protective layer.

Claims

1, a kind of direct-buried insulated pipe is made of conduit (1), thermal insulation layer (2) and protective layer (3), it is characterized in that described conduit (1) is a plastic tube, and described thermal insulation layer (2) is a urethane foam, and described protective layer (3) is an elastic polyurethane coating.

2, direct-buried insulated pipe as claimed in claim 1, the thickness that it is characterized in that described thermal insulation layer (2) is the 20-50 millimeter.

3, direct-buried insulated pipe as claimed in claim 1, the thickness that it is characterized in that described protective layer (3) is 3 millimeters.