CN203857145U

CN203857145U - Direct burial prefabricated heat preservation high-temperature hot water pipe

Info

Publication number: CN203857145U
Application number: CN201420188864.6U
Authority: CN
Inventors: 刘刚; 董明涛
Original assignee: LIAONING LONG BIG TUBE INDUSTRY Co Ltd
Current assignee: LIAONING LONG BIG TUBE INDUSTRY Co Ltd
Priority date: 2014-04-18
Filing date: 2014-04-18
Publication date: 2014-10-01
Anticipated expiration: 2024-04-18

Abstract

The utility model relates to the field of a direct burial heat reservation pipe prefabricated by a high density polyethylene outer protection pipe and polyurethane foam plastic, in particular to a direct burial prefabricated heat preservation high-temperature hot water pipe. The hot water pipe comprises a work steel pipe, a heat preservation layer and the outer protection pipe; the heat preservation layer is arranged between the work steel pipe and the outer protection pipe; thermal contraction sealing end caps wrap the sections of two ends of the outer protection pipe and the heat preservation layer; the hot water pipe is characterized in that a galvanized steel wire netting layer and a glaze aluminum plate are arranged between the work steel pipe and the heat preservation layer in sequence from inside to outside. Guide positioning rings are arranged at two ends of the galvanized steel wire netting layer. Compared with the prior art, the direct burial prefabricated heat preservation high temperature hot water pipe has the beneficial effects that an inner layer temperature reducing thermal insulation structure formed by an air thermal insulation layer and a reflection thermal insulation layer is constructed, for the high-temperature medium pipeline with the designed operation temperature being between 120-150 DEG C, the interface temperature of the inner surface of the polyurethane heat preservation layer is reduced below 120 DEG C, the carbonization of the polyurethane material is prevented to avoid damage, and the long-term safe and stable operation of the high-temperature hot water pipeline is ensured.

Description

A kind of direct-burried prefabricated thermal insulation high-temperature-hot-water pipe

Technical field

The utility model relates to the high-density polyethylene external protective pipe urethane foam prefabricated direct-buried thermal insulation pipe field that meets CJ/T114-2000 or GB/T29047-2012 standard, particularly relates to a kind of direct-burried prefabricated thermal insulation high-temperature-hot-water pipe.

Background technique

At present, in engineering for running temperature not higher than 120 DEG C, peak temperature, higher than the central heat supply hot water piping of 140 DEG C, does not all adopt the high-density polyethylene external protective pipe urethane foam prefabricated direct-buried thermal insulation pipe that meets CJ/T114-2000 or GB/T29047-2012 standard.Due to the expansion of urban construction, the load of heating network increases gradually, the heat capacity of original pipeline more and more cannot meet the requirement of resident's heat supply in winter, pipeline is rebuild and cannot be implemented in time owing to being subject to many-sided restriction such as fund, examination & approval, Guan Wei, planning and construction of the city, improve running temperature parameter and become unique way of utilizing existing pipeline to meet increment heat load, but, in a lot of situations, the heat resistance that is limited by original pipeline polyurethane insulation coating cannot meet, still cannot improve Operational Limits, the problem that heats not up to standard etc. still can not get solving.

For newly-built pipeline, in the future may face the ever-increasing situation of identical heat load, so, in the time of pipeline construction, even if design and operation temperature, in the interval below 120 DEG C, still need to, for meeting the reserved possibility of increment heat load by promoting temperature parameter in the future in the time of Pipe material selection, be selected the thermal insulation pipe that can all can move reliably and with long-term 150 DEG C of following temperature ranges when this just requires central heat supply pipeline construction, but the domestic matured product that does not substantially also meet this requirement at present.

Summary of the invention

The purpose of this utility model is to provide a kind of direct-burried prefabricated thermal insulation high-temperature-hot-water pipe and production method thereof, overcome the deficiencies in the prior art, the interface temperature that makes pipeline polyurethane insulation coating internal surface still in 120 DEG C of following safety temperature intervals, ensures that polyurethane layer does not occur that carbonization damages under 120 DEG C～150 DEG C high temperature media running environment under 150 DEG C of long-time running conditions.

For achieving the above object, the utility model is achieved through the following technical solutions:

A kind of direct-burried prefabricated thermal insulation high-temperature-hot-water pipe, comprise working steel tube, thermal insulation layer and outer pillar, between working steel tube and outer pillar, be provided with thermal insulation layer, the two ends section of outer pillar and thermal insulation layer is enclosed with thermal shrinkage sealing end cap, between described working steel tube and thermal insulation layer, be provided with successively from the inside to the outside Galvanized Steel Wire stratum reticulare and light face aluminium sheet, the two ends of Galvanized Steel Wire stratum reticulare are respectively equipped with guide-localization ring.

Described outer pillar is the one in high density polyethylene pipe or mechanical Wet Winding Process glass fibre thermosetting resin sand inclusion pipe.

Between described working steel tube and Galvanized Steel Wire stratum reticulare, be provided with aerogel thermal insulation layer.

Compared with prior art, the beneficial effects of the utility model are:

1) by constructed the internal layer desuperheat heat-insulating structure of an air heat-insulation layer and reflective insulation layer composition between Galvanized Steel Wire Netting, light face aluminium sheet and working steel tube three, high temperature media pipeline for design and operation temperature at 120 DEG C～150 DEG C, the internal surface interface temperature of polyurethane insulation coating can be reduced to below 120 DEG C, prevent that polyurethane material from occurring that in pipeline performance process carbonization causes damage, ensure the stable operation of high-temperature-hot-water pipeline long-term safety.

2) the utility model is with respect to conventional polyurethanes thermal insulating hot water pipe road, cost increase is very limited, Economy meets requirement of engineering, for the heat supply network load day by day increasing, cannot carry out in time under the condition of pipeline reconstruction, in the time that raising running temperature parameter becomes unique alternative solution, the utility model provides economical, safe and reliable solution, avoid to a great extent pipeline repeated construction, saved a large amount of social investments.

Brief description of the drawings

Fig. 1 is the utility model example structure schematic diagram.

In figure: the outer pillar 8-aerogel thermal insulation layer of 1-working steel tube 2-guide-localization ring 3-thermal shrinkage sealing end cap 4-Galvanized Steel Wire Netting 5-light face aluminium sheet 6-thermal insulation layer 7-

Embodiment

Below in conjunction with specific embodiment, the utility model is described in further detail:

See Fig. 1, it is a kind of direct-burried prefabricated thermal insulation of the utility model high-temperature-hot-water pipe example structure schematic diagram, comprise working steel tube 1, thermal insulation layer 6 and outer pillar 7, between working steel tube 1 and outer pillar 7, be provided with thermal insulation layer 6, the two ends section of outer pillar 7 and thermal insulation layer 6 is enclosed with thermal shrinkage sealing end cap 3, between working steel tube 1 and thermal insulation layer 6, be provided with successively from the inside to the outside Galvanized Steel Wire stratum reticulare 4 and light face aluminium sheet 5, the two ends of Galvanized Steel Wire stratum reticulare 4 are respectively equipped with guide-localization ring 2, when work, when working steel tube 1 expanded by heating, can be under the constraint of guide-localization ring 2, in zinc-plated steel mesh, realize Axial Thermal displacement.

For different outside Environmental Conditions, outer pillar 7 can be selected the one in high density polyethylene pipe or mechanical Wet Winding Process glass fibre thermosetting resin sand inclusion pipe.For further improving heat insulation effect, between working steel tube 1 and Galvanized Steel Wire stratum reticulare 4, can be provided with aerogel thermal insulation layer 8.

The production method of a kind of direct-burried prefabricated thermal insulation of the utility model high-temperature-hot-water pipe, its concrete implementation step is as follows:

1) first Galvanized Steel Wire Netting is rolled into tubular, fixes by connecting ring, be cut into the length needing, guide-localization ring is welded respectively at two ends;

2) working steel tube two ends be positioned over assembling stand on, by step 1) in Galvanized Steel Wire Netting be sleeved on working steel tube, the two ends of working steel tube grow respectively the each 80～120mm in two ends of guide-localization ring;

3) the coated light face aluminium sheet of installing of segmentation outside Galvanized Steel Wire Netting, adjacent light face aluminium sheet all adopts overlapping mode, and fixes with rivet, and overlapping the slot adopts aluminum foil and adhesive tape bonding firmly, and ensures the sealing of overlapping the slot;

4) outer protective pipe sleeve is contained in to the outside of light face aluminium sheet, make the both ends of the surface of positioning and guiding ring grow respectively outer pillar both ends of the surface 80～120mm, between the internal surface of pillar and the outer surface of positioning and guiding ring, temporary sealing flange is installed outside, is made to form between outer pillar, positioning and guiding ring, light face aluminium sheet and temporary sealing flange the cavity of a sealing;

5) with high pressure foaming machine, hard polyurethane foam agent proportioning and quantity is on request injected to cavity, form density and be not less than 60kg/m ³thermal insulation layer, leave standstill be no less than 10 minutes;

6) thermal shrinkage sealed end cap sleeve is contained in to thermal insulation layer end, the edge of thermal shrinkage sealing end cap overlaps with the outer surface of light face aluminium sheet and outer pillar respectively, with spray gun baking thermal shrinkage end cap, until sealing when the edge of end cap evenly overflows hot melt adhesive, thermal shrinkage finishes.

Claims

1. a direct-burried prefabricated thermal insulation high-temperature-hot-water pipe, comprise working steel tube, thermal insulation layer and outer pillar, between working steel tube and outer pillar, be provided with thermal insulation layer, the two ends section of outer pillar and thermal insulation layer is enclosed with thermal shrinkage sealing end cap, it is characterized in that, between described working steel tube and thermal insulation layer, be provided with successively from the inside to the outside Galvanized Steel Wire stratum reticulare and light face aluminium sheet, the two ends of Galvanized Steel Wire stratum reticulare are respectively equipped with guide-localization ring.

2. a kind of direct-burried prefabricated thermal insulation high-temperature-hot-water pipe according to claim 1, is characterized in that, described outer pillar is the one in high density polyethylene pipe or mechanical Wet Winding Process glass fibre thermosetting resin sand inclusion pipe.

3. a kind of direct-burried prefabricated thermal insulation high-temperature-hot-water pipe according to claim 1 and 2, is characterized in that, between described working steel tube and Galvanized Steel Wire stratum reticulare, is provided with aerogel thermal insulation layer.