JPH0315915Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a heat insulating cladding pipe used in piping systems for hot water supply or air conditioning.

For example, in the piping system of a hot water heating system,
In order to transport hot water back and forth between a heat source device such as a boiler and a terminal device such as a radiator, a double series of heat-insulating cladding tubes, which are made of two conduits made of copper tubes and covered with a coating material, are often used. ing.

The cross-sectional shapes of typical ones are shown in Figure 1 a, b,
and c. In the same figure, small diameter conduit 1,
A heat insulating material layer 2, 2' made of low foam polyethylene or the like is provided around 1', and a thin protective layer 3 made of synthetic resin such as polyethylene is provided around the outer periphery of the heat insulating layer 2, 2'.

This type of heat insulating cladding is compact and durable, making it easy to construct and fit well into buildings, but the drawback is that heat radiation loss from the conduit to the surroundings is large.

On the other hand, in order to reduce this heat radiation loss, some devices are used that have improved insulation. FIG. 2 shows the cross-sectional shape of a typical example.

In the figure, heat insulating material layers 21, 21', 22 made of highly foamed polyethylene, polypropylene, polyurethane, etc. are applied around the conduits 1, 1', and a protective layer 3 is applied around the outer periphery. ing.

Although this type of heat insulating cladding has little heat radiation loss, its external dimensions are larger than necessary, which causes problems in fitting into buildings and in constructability. Furthermore, since the coating layer is soft, there are disadvantages such as not only the internal conduit being easily damaged during construction but also difficulty in construction.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of conventional products, and to provide a heat-insulating cladding with low heat radiation loss and good workability.

According to the present invention, the purpose is to create a cross-section in which two conduits are arranged in parallel with a thin synthetic resin material interposed between them, and a tape layer and spacers with low emissivity are arranged to provide multiple air layers. This can be achieved by having a structure in which an oval core is inserted into a corrugated tube having an oval cross section.

This will be explained with reference to FIG. Figure 3a,
In b, two conduits 1 and 1' made of, for example, copper pipes are arranged in parallel with a spacer 4 made of a thin and heat-resistant synthetic resin tape between them, and around them, for example, a shiny aluminum A tape 5 made of a material with low thermal emissivity such as foil is tightly wound at a predetermined pitch so that the side edges overlap,
Around this, a spacer 6 made of, for example, a thin linear body made of synthetic resin is loosely wound at a predetermined pitch. Around this spacer 6, a tape 7 made of a laminate film in which a material with low thermal emissivity, such as aluminum foil, is integrated with paper or a synthetic resin film is placed so that the side edges overlap with the glossy side inside. and a spacer 6' of the same type as the spacer 6, which is wound with a predetermined pitch.
Tapes 7 of the same type as the tape 7 are each wound at a predetermined pitch to form a core 8 having an oval cross section. The core 8 is loosely inserted into a corrugated tube 9 having an oval cross section and made of, for example, a flexible polyethylene tube whose tube wall is corrugated.

In this way, by confining the space with the tapes 5, 7 and 7' and forming a plurality of air layers 10, 11, 11' and 12, heat transfer due to air convection is suppressed and heat transfer due to radiation is suppressed. , heat radiation loss can be further reduced. In addition, since the cross-sectional shape of the corrugated tube 9 that houses the core 8 is similar to that of the core, the external dimensions of the insulated tube are small, and the flexibility of the corrugated tube 9 helps to make it easier to fit into buildings. and improve workability.

In each of the heat-insulating cladding tubes configured as described above, multiple air layers are formed around the conduit via spacers, so the air insulation effect is large.
Heat transfer due to radiation can also be suppressed by using a tape with a low emissivity as a boundary material between the air layers. In addition, since such a core is covered with a corrugated tube, the space between the core and the corrugated tube also acts as an air insulation layer and not only suppresses heat dissipation, but also prevents mechanical strength from being insufficient for protection. can be supplemented. Of course, since the corrugated pipe has an oval shape with a cross section similar to that of the core, the outer diameter of the insulated pipe can be reduced, and combined with its appropriate flexibility, it fits well in buildings and is easy to construct. It is.

Although not mentioned in the previous explanation, the spacers 4 and 6 shown in FIG. 3 may be used as spacers and signal lines, or may be colored and used for identification. Additionally, if a metal pipe is used as the conduit and a conductive material such as aluminum foil is used as the covering material, it is possible to provide a function to detect nailing accidents during construction by measuring the electrical resistance between the two. . Of course the third
If a warning wire is inserted into the space between the conduits 1, 1' and the tape 5 in the figure, a water leakage detection function can be provided by reducing the insulation resistance of the warning wire due to water leakage.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing an example of a conventional heat-insulating cladding tube, and FIG. 3 is an explanatory view showing an example of a heat-insulating cladding tube according to the present invention. 1 and 1'... conduit, 4, 6 and 6'... spacer, 5, 7 and 7'... tape made of material with low thermal emissivity, 8... core, 9... corrugated tube, 1
0, 11, 11' and 12...air layers.

Claims (1)

[Scope of utility model registration request] A tape with low emissivity is wound around two conduits arranged in parallel with a spacer made of synthetic resin tape between them to form an air layer under the tape layer, and a linear A spacer is wound in a spiral, a tape having a low emissivity is wound on top of the spacer to form an air layer under the tape layer, and a linear spacer is further wound in a spiral on top of the tape layer. A core with an oval cross section, which is made by winding a tape with low emissivity on top of the core to form an air layer under the tape layer, is inserted into a corrugated tube with an oval cross section. A heat-insulating cladding pipe featuring: