JPH0322633Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an insulated pipe used for hot water supply, etc.

Conventionally, insulated pipes used for hot water supply and central heating in apartment complexes are mainly long pipes whose outer periphery is covered with a plastic-based heat insulating material to facilitate on-site construction.
For example, as shown in Fig. 1, two copper pipes 1, 1' are covered with heat insulating layers 2, 2' made of low foam polyethylene on their outer peripheries, and are brought into close contact with each other, and a protective layer 3 is further coated on the outside. However, recently, insulated pipes equipped with signal wires have been developed to detect the hot water temperature inside the radiator and prevent unnecessary hot water supply. That is, the second
As shown in FIG.
A signal line 4 consisting of a plurality of insulated core wires is sandwiched between a heat-insulating tube coated with a protective layer 3 and a protective layer 3 is coated on the outside.

However, when the insulated pipe with a signal line shown in Fig. 2 is bent into a coil shape, the signal line 4 may be bent and damaged, and the insulated pipe shown in Fig. 3 necessarily has a large outer diameter. In addition, when these two are connected by peeling off the heat insulating layer at the terminal part during construction, the tubular body such as the copper pipe and the signal line are often damaged, which poses a serious problem in terms of quality. In addition, the signal line consists of multiple insulated core wires, but since these core wires are installed separately, it is difficult to insert the signal wire into the terminal cap etc. during terminal processing of the insulated pipe, resulting in work efficiency. It made things difficult.

The present invention was completed as a result of intensive study in view of the current situation, and the insulation with signal wires can be easily processed without increasing the outer diameter and without damaging the signal wires and tubular bodies during terminal processing. It provides a tube.

That is, the insulated pipe of the present invention has a thin, dumbbell-shaped cross section, and is made of two tubular bodies, with conductors provided at both ends between them, and the conductors connected together with a thin electrical and thermal insulating coating layer. The signal wires, which also serve as spacers, are sandwiched and arranged in parallel, the outside of which is covered with a heat insulating layer, and the outside of which is covered with a protective layer.

The signal line in the present invention also serves as a spacer to separate two tubular bodies, and as shown in FIG. 4, a plurality of conductors 5, 5', 5'', etc. are arranged at both ends. These conductors are integrally connected by a thin electrical and thermal insulating coating layer and have a dumbbell-shaped cross section.

In the present invention, the reason why the signal line is used as a spacer and has a thin, dumbbell-shaped cross section is that normally, twin-tube insulated pipes have high-temperature hot water in one tubular body, and low-temperature water in the other tubular body. Although the reduced return hot water is allowed to flow in, since the liquid temperature in both tubular bodies is different, the thermal efficiency is significantly improved by providing a spacer between the tubular bodies without directly contacting each other, and the outer diameter size is It simultaneously satisfies issues such as being able to control the temperature of hot water passing inside the conductor by arranging the signal wire without increasing the signal wire, and being able to easily insert the signal wire into the terminal cap etc. without damaging the signal wire during construction. This is to make it happen.

Further, the heat insulating layer in the present invention may be any material as long as it provides excellent heat insulating properties and is not particularly limited, but as shown in FIG. Independent protrusion 1 with a convex surface
The heat insulating layer made of the heat insulating spacer 8 formed by integrally attaching a large number of spacers 8 has a point contact between the plastic base material and the tubular body through the independent protrusions, and can significantly suppress the conduction of heat from the tubular body. It is preferable to form a void between the body and the plastic base material because it can significantly enhance the heat insulation effect.

The heat-insulating pipe that uses this heat-insulating spacer as a heat-insulating layer is
When processing the terminal with a tool such as NT Tatsuka,
Since there is a cutting allowance corresponding to the height of the protrusion, it is possible to work without damaging the inner pipe such as a copper pipe, and when removing the heat insulating layer (insulating spacer), the contact area between the heat insulating layer and the inner pipe is small. It has the advantage of being extremely easy to extract.

Note that this heat insulating spacer is not limited to one layer, but may be provided in two or more layers to form a heat insulating layer.

Another example of the heat insulating layer is a heat insulating layer formed by wrapping a plastic tube around the outer periphery of a tubular body and providing an aluminum tape on the outside. A heat insulating layer having such a structure is preferable because a radiation heat insulating layer can be formed between the tubular body and the tape by the void and the aluminum tape.

Further, in the present invention, a protective layer is provided on the outside of the heat insulating layer, and a plastic corrugated tube, straight tube, flexible tube, etc. can be used as the protective layer. Among these, plastic corrugated tubes are preferred because they are flexible and can form a more effective air layer between them and the heat insulating layer, thereby further improving the heat insulating effect.

As the tubular body in the present invention, metal pipes such as copper pipes, aluminum pipes, and steel pipes, and plastic pipes such as polyethylene and polybutene are used.

Next, an example of the present invention will be explained with reference to the drawings. 6th
As shown in the figure, a copper tube 1 with an outer diameter of 8 mm and a wall thickness of 0.5 mm,
A thin signal line 7 having a dumbbell-shaped cross section and serving as a spacer as shown in FIG. A heat insulating layer 8, 8' is provided by overlapping two layers of heat insulating spacers each having a large number of convex independent protrusions attached together, and outer diameter 30 mm (long diameter) x 20 mm (breadth diameter) and inner diameter 25 mm ( A protective layer 11 made of a polyethylene corrugated pipe having a length of 15 mm (longer diameter) and 15 mm (breadth diameter) was provided to obtain an insulated pipe of the present invention.

As detailed above, the heat insulating pipe of the present invention has the following effects.

(1) Since the signal line has a dumbbell-shaped cross section and is clamped between two tubular bodies, it can be stably fitted between the tubular bodies and can be finished without increasing the external dimensions of the insulated pipe. can.

(2) Since the signal line also has the function of a pacer, thermal efficiency can be significantly improved.

(3) Since the signal wire is integrally formed and disposed between the tubular bodies, the signal wire will not be damaged even when the insulation layer is stripped off during terminal treatment of the insulation pipe.

(4) Since the signal line is integrally formed and is placed between the tubular bodies and also serves as a spacer, the efficiency of inserting the signal line into a terminal cap or the like is significantly improved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional heat-insulated pipe, Figures 2 and 3 are cross-sectional views of a conventional heat-insulated pipe with a signal line, and Figure 4 is a cross-sectional view of the heat-insulated pipe of the present invention, which also serves as a thin spacer with a dumbbell-shaped cross section. FIG. 5 is a partial perspective view showing an example of the heat insulating layer in the heat insulated pipe of the present invention, and FIG. 6 is a cross sectional view showing an example of the heat insulated pipe of the present invention. 1, 1'... Tubular body (copper tube), 2, 2'... Heat insulation layer, 3... Protective layer, 4, 7... Signal line, 5, 5',
5″...Conductor, 6...Electrical and thermal insulation coating layer, 8,
8'...Insulating layer by heat insulating spacer, 9...Plastic base material, 10...Independent protrusion, 11...Protection layer by plastic corrugated tube.

Claims (1)

[Claims for Utility Model Registration] (1) A cross-sectional dumbbell made of two tubular bodies with a conductor provided at both ends between them and integrally connected between the conductors with a thin electrical and thermal insulating coating layer. A heat insulating pipe characterized in that thin signal wires that also serve as spacers are clamped and arranged in parallel, the outside of the signal wire is covered with a heat insulating layer, and the outside of the signal wire is further provided with a protective layer. (2) The heat insulating layer according to claim 1 of the utility model registration claim, wherein the heat insulating layer is composed of a heat insulating spacer formed by integrally attaching a large number of independent protrusions with convex tips to at least one side of a plastic base material. tube. (3) The heat-insulating pipe according to claim 1, wherein the protective layer is made of a plastic corrugated pipe.