JPS6154134B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water piping member used in a hot water heating system, etc., and is capable of transmitting signals by covering two piping pipes and one optical fiber with the same or different types of heat insulating material. The purpose of this invention is to equivalently improve the bending R resistance and impact resistance of optical fibers for use in industrial applications, and to improve the ease of installation work.

Figure 3 shows an example of the configuration of a hot water heating system, where 1 is a heat source;
2A to 2N are radiators, 3A to 3N are hot water pipes that secure hot water passages between the heat source 1 and each of the radiators 2A to 2N, 4A to 4N are controllers 1φ for the heat source 1,
These are electric wires that electrically connect the controllers Aφ to Nφ of each of the radiators 2A to 2N.

The hot water pipes 3A to 3N and the power supplies 4A to 4N may be installed separately, but as shown in Fig. 4, a piping member 34 in which the hot water pipes 3 and the electric wires 4 are covered with the same heat insulating material is used. Sometimes I do.

There are two drawbacks to such a member. First, since electrical signals are transmitted through electric wires, the signal transmission quality is strongly dependent on external noise. Second, at least two electric wires are required, and the installation work also requires connection of at least two electric wires.

These drawbacks can be solved by using optical fibers for the signal transmission path. That is, firstly, it is hardly affected by external noise, and secondly, the signal is an optical signal, and there is no need to provide a current feedback circuit, so only one line is required. However, optical fiber itself has the following drawbacks compared to electric wire. Firstly, the minimum allowable bending radius is relatively large, secondly, the impact resistance is relatively small, and thirdly, it has temperature characteristics. The first and second drawbacks of these are:
This problem can be solved by simply covering the optical fiber with the same heat insulating material as shown in FIG. 4, but the third temperature characteristic deteriorates. This is because the ambient temperature of the optical fiber is increased by the hot water pipe.

The present invention has been made in view of the above drawbacks. FIG. 1 is a diagram showing a schematic configuration of a piping member according to an embodiment of the present invention, in which the optical fiber 6 is installed closer to the hot water return pipe 32 than the center of the piping member 34''.The hot water temperature in the hot water return pipe 31 is , is higher than the temperature of the hot water in the hot water return pipe 32. Therefore, according to the configuration shown in FIG. becomes small.

FIG. 2 is a schematic configuration diagram of a piping member according to another embodiment of the present invention, in which an optical fiber 6 is embedded in a V-shaped groove of a piping member 34 having two upper and lower V-shaped grooves 8 in its cross section. The V-shaped groove is filled with a heat insulating material 7 that is the same type or different from the heat insulating material 5. By doing so, it is possible to reduce the temperature rise of the optical fiber 6 due to the hot water flowing through the pipe 3, and it is also possible to improve the bending radius and impact resistance during installation work.

As detailed above, according to the present invention, firstly, the optical fiber is embedded in the hot water piping member, so installation work is easy. Since the influence of hot water is limited to a minimum, the effect of reducing deterioration of transmission quality due to temperature characteristics can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional perspective view showing the structure of a hot water piping system according to one embodiment of the present invention, Fig. 2 is a cross-sectional perspective view showing the structure of another embodiment of the present invention, and Fig. 3 is a schematic configuration of the hot water heating system. FIG. 4 is a cross-sectional perspective view of an example of a conventional piping member. 31, 32...Hot water pipe, 6...Optical fiber, 5...Insulating material, 34'', 34...Piping member.

Claims (1)

[Claims] 1. A hot water piping device comprising a hot water pipe, an optical fiber, and a heat insulating material provided around the hot water pipe and around the optical fiber, and also between the hot water pipe and the optical fiber.