FI58827B - FJAERRVAERMEKANAL SAERSKILT FOER HETVATTENLEDNINGAR - Google Patents

Description

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Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2352623.0 (71) Granges Nyby AB, S-6U0 UU Nybybruk, Sweden-Sverige (SE) (72) Lennart Lundbohm, Ektorp, Sweden-Sverige (SE) (7U) Oy Kolster Ab ( 5U) District heating duct, especially for hot water pipes -Fjärrvärmekanal, särskilt för hetvattenledningar

The invention relates to a district heating duct, in particular a hot water duct and a duct having one or more heat conducting tubes laid in the duct on one or more substrates made of heat insulating material, each duct being spaced apart by a first waterproof cover film another insulation on which the filling is placed.

ÄT Patent Publication No. 253,879 discloses a district heating duct in which the pipes are supported on a base with metal legs and insulated with a surrounding fibrous mat which is waterproofed on the outside with bitumen cardboard 11a and a plastic bond. In this known telescopic duct, the ingress of moisture must be strictly prevented, because once the ingress of moisture in this duct construction method does not leave the insulation or requires a rather long drying time.

A self-drying remote duct channel has also been proposed (DE Application Publication No. 2,345,777). The insulating material is then not surrounded by a waterproof shell but by 2 or more cover films with holes which overlap.

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The holes are then so small that they allow the steam to escape or evaporate, which is formed by the evaporation of water in or penetrating the insulation material, but they also prevent water from penetrating from the outside through the holes into the insulation mass. This water, instead, flows outside the perforated membrane along the sides and down to the bottom of the channel or ditch, from where it is removed by means of drainage pipes lowered to the bottom.

The object of the invention is to improve such a district heating duct, in particular its thermal and moisture insulation. According to the invention, this is achieved in that the first insulator consists of prefabricated pieces of hollow cylinder segments and the plastic cover film is provided in its upper half with small holes permeable only to water vapor and in its lower half with large holes for the outflow of accumulated water.

By using hollow cylinder segments, among other advantages, the possibility of simple installation is achieved.

According to the invention, it is particularly advantageous if the tube or tubes are surrounded by more than one closed film, in which case an insulating layer, which may consist of insulating body pieces formed by said hollow cylindrical parts, is always placed between each cover film shell.

The pipe is preferably provided with an insulating and cover film shell before being lowered into the duct and is lowered part by part. In the case of a joint, the pipes are joined, for example, by welding, and the insulating layer or layers and the cover film shell or shells are joined using hollow cylindrical insulating presses and sleeves made of perforated cover films connected to the tube cover by welding.

According to the invention, the cover film may have holes of different sizes, i.e. e.g., small holes above and on the sides of the insulating material and large holes below. The small holes are then so small that they prevent water from penetrating from the outside into the insulating material, but allow the water vapor to flow out, which is formed when the penetrating moisture evaporates. The underside of the holes are, by contrast, are so high that the water can drain away from the inside out. This can be condensed water that has accumulated in the lower part of the cover film shell or water that has penetrated the insulation during floods or torrential rains.

The embodiment of the telescopic channel according to the invention thus has a short drying time, i. only short-term soaking occurs, especially chromium steel, but not long-lasting as in known hot water pipes. These require very long drying times, resulting in a greater corrosive effect.

3 58827

The invention will now be illustrated by means of schematic drawings of one embodiment, in which: Fig. 1 shows a cross-sectional view of a telescopic duct made in accordance with the invention, in which two hot water pipes are laid; Fig. 2 shows a cross-sectional view similar to Fig. 1 of a modified embodiment of a district heating duct according to the invention; and Figure 3 shows a portion of the front of the cover film with varying sizes of holes.

Drain pipes 2 not lowered to the bottom of the ditch 1. The hot water pipes 3 rest on pieces of insulating material 4, which consist of either one or more pieces arranged apart from each other. It is also possible to use a loose pile of insulating material on which the pipes are placed.

The tubes 3 are surrounded by an insulating material shell 6 consisting of prefabricated, hollow cylinder parts. In the embodiment of Figure 1, the tubes 3 are surrounded by two hollow cylinder parts which rest against the tube at an angle of 180 °. The suitable material for the insulation materials is rock wool, glass wool or foam.

The space above the pieces 4 and between the pipes 3 provided with the insulating material 6 and the cover film shells 5 is filled with loose insulating material 7, which also covers the drying pipes 2. On top of the insulating material filling 7, the ground obtained by digging the ditch is placed. It is also possible to cover the duct with a pavement, because the structure of the district heating duct according to the invention can be loaded.

In the embodiment of Figure 2, each tube is surrounded by two insulating material shells 6 and 6 ', between which a first cover film shell 5 is placed. A second cover film shell 5' is placed around the insulating material shell 6 '. In the embodiment of Figure 2, the insulating shell 6 consists of prefabricated, hollow cylindrical parts surrounding the tubes 3 in a 180 ° angular sector. The insulating material shell 6 'consists of three pieces of insulating material, which are hollow cylindrical parts which surround the circumference of the pipe 3 in an angle sector of 120 °.

As shown in Fig. 3, the films surrounding the heat-insulating layer preferably consist of a uniformly thick base layer 8 with small holes 9, 9 'and 9 "with a diameter of more than 0.05 rmm and reinforcement ribs 10 extending like a net over the base layer. is against the insulation layer.

In order for condensate water or, for example, water infiltrated during a flood to be led away from the lower part of the channel, there are holes 9 with a diameter of 0.05-0.2 mn only on the side of the film 5 above or on the sides of the insulating shell 6 and 6 '. The holes 9 'in the lower part of the membrane do not increase in diameter. The boundary between the upper and lower part of the film is shown in 12. The diameters of the holes 9 'and 9 "can be up to 4 mm or even 6.

The examples shown are merely illustrative of the invention and do not limit it.

Claims (3)

4,5827 A district heating duct, in particular for hot water pipes, comprising one or more heat conducting pipes laid in the duct on one or more substrates made of heat insulating material, each duct spaced outside the gutter, waterproof cover film by a second insulation and a first insulator on which the filling is placed, characterized in that the first insulator consists of prefabricated pieces (6) of hollow cylinder segments and the plastic cover film (5) is provided in its upper half with small holes (9) permeable only to water vapor and in its lower half with larger holes (9 ', 9 ") for the outflow of accumulated water. District heating duct according to Claim 1, characterized in that two or more perforated cover films (5, 5 ') are arranged at different radial distances from the pipes (3) and prefabricated insulating pieces (6, 6') are arranged between them. District heating duct according to Claim 1 or 2, characterized in that the small holes (9) of each cover film (5, 5 ') have a diameter of 0.05 to 0.2 mm and the larger holes (9', 9 ') have a diameter of at most 6 mm.