DK169262B1 - Heat-distributing mounting system for clamping heating/cooling pipes on insulated pipes for liquid or gaseous media - Google Patents

Abstract

A heat-distributing mounting system for clamping heating/cooling pipes on pipes for liquid or gaseous media. The system consists of one or more metal profiles which hold the heating/cooling pipes over the full pipe length and are clamped to the medium pipe by means of plastic spacers and clamping bands. Figure 6 shows the system in a finished pipe construction. The heating/cooling pipes 1 are retained on the medium pipe 2 by being clamped in a channel, open towards the medium pipe, in the heat-distributing metal profiles 3. Positioned above the metal profiles with a suitable interspace are plastic spacers 4, and bearing against these are a number of plastic spacers 5 of more simple design. In the spacers, there are respectively a cutout and a slot for fixing a band made of steel or plastic 6. Clamping is effected by tightening the band which is joined on the opposite side of the metal profiles. The pipe construction is completed with insulating material 7 and an insulating cover 8. On account of the low rigidity of the profile in the transverse direction and considerably greater rigidity in the longitudinal direction, relatively small pipes can be retained on larger medium pipes in such a manner that good heat transfer and small temperature gradients in the medium pipe wall are obtained. The system is used on insulated pipes and can also ensure that a given minimum distance to where the insulation ends is achieved. The invention is especially suitable for pre-insulated pipe systems in which heat is to be transferred from outer pipes to medium pipes, for example to maintain a given temperature level in the medium. <IMAGE>

Description

- i - DK 169262 B1

The invention relates to a heat-distributing mounting system for clamping heat / cooling pipes to pipes for liquid or gaseous media. The media carrying tube is then referred to as the media tube. The system consists of one or more metal-5 profiles, which hold the heating / cooling pipes to the full pipe length and are fastened to the media pipe by means of plastic spacers and clamps. Due to the low transverse stiffness of the profile and substantially greater longitudinal stiffness, relatively small pipes can be retained for 10 larger media pipes, so that good heat transfer and small temperature gradients in the media pipe wall are achieved. The system is applied to insulated pipes and can further ensure that a given minimum distance to the insulation termination is achieved.

15 Pre-insulated pipe systems are known in which heat can be transferred from outer pipes to media pipes, for example, to maintain a given temperature level in the medium. In order to reduce the heat transfer resistance, in some cases, the tubes are wound with thermally conductive foil and / or grout with thermally conductive "cement". However, a well-defined and at the same time small transition resistance is difficult to achieve in this way - not least if the heat-emitting tube and / or the media tube is made of plastic.

The invention provides a fastening system of the kind mentioned above, which ensures a well-defined and good heat transfer also from very soft plastics pipes even at a relatively large distance between the clamps. The clamping is done with ordinary, commercially available 30 strips of steel or plastic. No heat-conducting cement or the like must be applied, which makes installation very easy and fast.

This is achieved by a fastening system of the type mentioned in the introduction and characterized in that the metal profile with associated plastic spacers can clamp about a heating / cooling pipe of a given diameter and at the same time be close to a media pipe. of arbitrary diameter over a lower boundary which depends only on the diameter of the heating / cooling pipe.

Two types of spacers are used, one type, referred to as type 1, is formed at the bottom with cross sections such as the metal profile so that it can be placed thereon; in the middle of the profile are two tabs perpendicular to the base plate with a space suitable for a clamp. The second type, referred to as type 2, is T-shaped and has a slot pas-iO transmitter for the same clamp. The required number of type 2 profiles depends on the dimension of the media pipe and how many metal profiles with the corresponding type 1 profiles to be used on the current pipe system. Both profile types are made of a thermoplastic having an elasticity of such size that the relatively thin base plate will be completely adapted to the curvature of the media tube by tightening the associated clamping band. The middle tabs of the spacers are shortened to the actual insulation thickness before mounting.

In a particular embodiment, the metal profile is provided with space for 2 or more heating / cooling pipes, which makes the construction simpler and thus easier to assemble than when using several single profiles next to 23 each other.

In another embodiment, the spacers are formed in a continuous row with the clamping belt drawn through holes in the radially positioned tabs after the mounting on the media tube. The number of tabs, respectively, such as the profile type 1 and profile type 2 described above, as well as the height of the tab, depend in this embodiment on the actual pipe construction - in return the clamping procedure here is very fast.

The invention will be explained in more detail below with reference to the drawings, in which FIG.

Figure 1 shows a cross section of a metal profile according to the invention with duct tightly fitting for a round heat / cooling pipe.

5 Figure 2 shows that the metal profiles are designed with the possibility of a compact gasket during transport.

Figure 3 shows a cross section of a similar metal profile, but with ducts for 2 heating / cooling pipes.

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Figure 4 shows type 1 plastic spacer.

Figure 5 shows plastic spacer type 2.

Figure 6 shows an example of a fully insulated pipe construction with the complete mounting system built in.

Figure 1 shows the cross-section of the heat-distributing metal profile in whose duct the heating / cooling pipe is placed during assembly. On this is placed the associated type 1 plastic spacers as shown in Fig. 4 with a distance in the direction of the tubes, which depends on the diameter of the current media tube as well as the stiffness of the media tube and / or the insulating cap 25. Figure 5 shows a plastic spacer type 2 which is placed close together against one or more metal profiles with spacers type 1. Figure 6 shows the pre-assembled system held to a media tube by means of the tightened and fixed clamping band. It can be seen that on the side of the media tube opposite to the metal profiles 30 there is a certain distance between the plastic spacers, type 2. This size of the gap depends on the dimension of the media tube, although in all cases it is less than the width of a spacer. The tape is tensioned and assembled with special tools on the opposite side of the metal profiles so that all the plastic profiles and thus also the metal profiles with the heating / cooling pipes are firmly abutting against the media tube. In this way, a well-defined and efficient heat transfer is achieved by temperature difference between heating / cooling pipes and media pipes. After completion of the heat distribution system, the media tube is insulated and insulated. The insulation can be carried out in the traditional manner or by inserting the media tube into a jacket tube and foam between the two plastic foam tubes, as is known from several types of pre-insulated pipe systems.

The metal profiles are designed to have a modest resistance to bending around the longitudinal axis to ensure good contact with both heat / cooling tubes and media pipes without the use of high tensile force, while the resistance to bending around the profile's transverse axes is relatively high, whereby a large distance between the clamps is obtained. Thus, for plastic tubing and / or insulating casing tubes of plastic, it may be their modest rigidity which determines the distance of the clamps due to requirements of the eccentricity of the tubing relative to the casing tube.

The heat-distributing mounting system can be used on long pieces of pipe without joints on the heat-distributing metal profiles, as these can be produced by both pressing and rolling. When using plastic heat / cooling pipes, which can be supplied in rollers in all dimensions of the mounting system, these pipes can also be mounted without more joints than those on the media pipes. It is noted that it is not uncommon for 30 pre-insulated rigid pipes to be produced in lengths of 16 m.

The heat-dissipating ability of the inventive mounting system also makes it very suitable for pipe systems, where both media pipes and heating / cooling pipes are made of plastic. A special use should be mentioned here:

When using thermoplastic media tubes, for example PE type, which are often used for cold water lines, it may be necessary to secure them against freezing when applying heat along the line. This can be done by applying electrical heating cables and insulating the media tube. In order to be able to replace defective cables, it is often necessary in practice for these to be drawn into pipes placed outside the media tube. Such pipes will then constitute what is referred to above as heat pipes. In such a pipe construction, it is inappropriate to use metal tubing as a drawbar for the electric cables, as this provides a relatively expensive piping system. In addition, corrosion problems can occur if 10 such pipes are used in humid environments, which can cause cable retraction problems - finally, sharp edges can damage the cables during the draw.

For example, in the case of electrical frost protection, a failure of a thermostat can cause unintentionally high temperatures in the heat pipe, which can result in an unacceptably high temperature in the media pipe, which is normally sized for a temperature of 20 ° C. In such a situation, an air pocket appears in the media tube, this may cause permanent deformation or actual fracture. If a metal tube is used as a heat pipe, the temperature in the wall of the media tube may become very high in the contact zone even if heat conductive foil and / or heat conducting "cement" is used. On the other hand, if a plastic pipe is used with the heat-distributing mounting system, relatively small temperature gradients will occur in the media wall, since a large part of the heat transfer takes place via the rather wide heat-distributing metal plate.

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Claims (3)

1. Heat-distributing mounting system for clamping heat / cooling pipes to insulated pipes for liquid or 5 gaseous media, consisting of one or more metal profiles, each of which securely holds a heating / cooling pipe for the full pipe length and is fastened to the media pipe by means of plastic spacers and straps, the plastic spacers being arranged to ensure that a given minimum distance to the insulation termination is achieved, characterized in that the heat-distributing metal profile having low transverse stiffness and substantially greater longitudinal stiffness in conjunction with the associated plastic spacers are arranged to clamp a heat / cooling pipe of a given diameter and at the same time abut close to the parallel running media pipe, the metal profile having a U-shaped part which fits the heating / cooling pipe, and on each side of the U a planar portion which, by deformation, can cause 20 to abut against the media tube for good heat-o passing the two tubes between. A heat distributing mounting system according to claim 1, characterized in that the metal profile can hold 25 or more heating / cooling pipes to the parallel running media pipe, the metal profile having 2 or more U-shaped sections with flat parts on each side of the IJs. Heat-distributing mounting system according to claim 1 or 30, characterized in that the plastic spacers are made in a continuous row with the clamping belt drawn through holes in the profile tabs radially positioned after mounting on the media tube. 35