JPS62210342A - Signal transmission line device in system of air conditioning, hot-water supplying or the like - Google Patents

Abstract

PURPOSE:To make the signal line of the transmission and reception of signals unnecessary and reduce the cost of the system of air conditioning, hot-water supplying or the like by a method wherein a high frequency coaxial line, constituted of the central conductor of a metallic pipe and the outer conductor of metallic foil of the coating of the pipe, is employed to effect the transmission and reception of the signals for operation control. CONSTITUTION:When metallic pipes 1a are connected mutually by a connecting nipple 1d and the outer diameter of metallic part, which serves as a central conductor, becomes larger locally, the inner diameter of a costing 1e is enlarged so that d1/d2 becomes the same as with the other pats whereby the characteristic impedance along the whole length of the line may be uniformized. Here, (d1) is the outer diameter of the inner conductor and (d2) is the inner diameter of the outer conductor. On the other hand, when a temperature keeping transmission pipeline 1 between thermal equipments becomes long and a support is necessitated in the middle thereof, a high-density insulation material is used for this part so as no to make this part unstable by the gravity of the pipeline 1, as a result, an equivalent permittivity is increased, therefore, the thickness of the insulating material 1b' of the supporting part of a supporting table 1e is increased so as to have a uniform characteristic impedance Z0 with the other parts. According to this method, the reflection or the attenuation of a signal may be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal transmission line device in systems such as air conditioning and hot water supply.

For example, an air conditioning system generally has a plurality of thermal devices consisting of one heat source device such as a water cooler and a plurality of heat exchangers, and heat insulation transport piping is provided between these thermal devices to transport a heat medium, and the heat source The heat medium supplied from the machine to the multiple heat exchangers is returned to the heat source machine as a drain.

The heat source equipment and the plurality of heat exchangers are provided with a controller for efficient air conditioning, and for example, the load state detected by a temperature sensor included in each controller of the plurality of heat exchangers is displayed. A signal is sent to the controller of the heat source device, the controller of the heat source device centrally monitors the load condition, and the capacity of the heat source device is controlled according to the load. In addition, signals are sent from the controller of the heat source equipment to the controllers of each of the multiple heat exchangers to control the on/off of the heat exchangers, switching the capacity, etc. A signal transmission line is provided between the plurality of thermal devices for transmitting and receiving signals therebetween.

[Prior Art and Problems to be Solved by the Invention] This type of signal transmission line in a conventional air conditioning system connects a signal line made of insulated bare conductor to a heat source device and a controller for each of a plurality of heat exchangers. Generally, it was constructed by laying cables between the two. However, with this configuration,
When the number of heat exchangers increases, there are problems such as an increase in the number of conductive wires to be routed, resulting in higher costs and higher construction costs for the wiring.

Therefore, by connecting the heat source equipment and the respective controllers of the plurality of heat exchangers to a signal transmission line consisting of a pair of conducting wires wired in a ring shape, and using the signal transmission line in time division or frequency division. There is also a system in which a pair of conductive wires is shared for transmitting and receiving signals between the controllers of a plurality of thermal devices, greatly reducing the number of conductive wires.

However, when transporting the heat medium from the heat source machine to multiple heat exchangers,
In addition to wiring the heat-retaining transport piping for returning the drain to the heat source equipment, it is extremely troublesome to install the signal transmission line as described above, and it would be desirable to omit such a signal transmission line if possible.

Similar problems also exist in hot water systems that supply hot water.

In view of the above-mentioned points, the present invention seeks to provide a signal transmission line device for systems such as air conditioning and hot water supply, which eliminates the need for wiring a signal transmission line used only for transmitting and receiving signals between control devices. It is something to do.

[Means and effects for solving the problem] The signal transmission line device according to the present invention, which has been made for this purpose, is suitable for heat-retaining transport piping that is routed to transport heat medium, hot water, etc. between a plurality of thermal devices. Focusing on the fact that the pipe is made of metal, a heat insulating material is wrapped around the pipe for heat retention, and an outer covering is provided on the outside of the heat insulating material for protection and prevention of heat radiation, the above-mentioned heat insulating material is It is made of a material with low conductivity and good electrical insulation, and a metal foil with good conductivity is provided on the side of the insulation material of the outer sheath, and the metal pipe is used as a center conductor, and the metal foil of the outer sheath is used as an external conductor. The present invention is characterized in that a high-frequency transmission coaxial line is constructed as a conductor, and signals are exchanged between the control means for operation control using the coaxial line.

Since the heat-retaining transport piping also serves as a signal transmission line, there is no need to provide a separate signal transmission line for only sending and receiving signals, resulting in significant cost reductions and construction costs for systems such as air conditioning and hot water supply. I can do it.

〔Example〕

Embodiments of the signal transmission line device according to the present invention will be described below with reference to the drawings.

FIGS. 1(a) and 1(b) are a cross-sectional view and a vertical cross-sectional view showing an embodiment of a signal transmission line device according to the present invention.

In the figure, l is a heat-retaining transport pipe for transporting a heat medium, and includes a metal pipe 1a, a heat-insulating material 1b for heat-retaining the heat medium wound around the outer periphery of the metal pipe 1 with a uniform thickness, and a heat-insulating material 1
It consists of a cover 1c provided on the outer periphery of b, which serves both as protection and to prevent heat radiation.

The heat insulating material 1b is made of glass wool, for example, which has a low thermal conductivity, low dielectric constant, and good electrical insulation properties. A metal foil 1c', such as aluminum foil, is applied to the side facing the heat insulating material 1b.

With the above configuration, the heat insulation transport piping 1 has a high frequency coaxial line in which the metal pipe 1 is the center conductor, the metal foil 1c' on the inner surface of the jacket IC is the outer conductor, and the heat insulating material 1b is the dielectric between the center conductor and the outer conductor. configured.

Therefore, by transporting a heat medium between thermal devices using this heat-retaining transport piping, signals can be exchanged between the controllers of the thermal devices using the piping. Moreover, since signals can be transmitted at high speed using high frequencies, they are extremely effective as a multiplex transmission method such as time division, and control reliability is maintained even when signals are exchanged between multiple thermal devices over a single line. It cannot be damaged.

FIG. 2 is a schematic diagram showing an example of an air conditioning system in which the heat-retaining transport pipe 1 described above with reference to FIG. are connected to each other by a heat-retaining transport piping 1, through which a heat medium is transported from a thermal device 2 on the heat source device side to a thermal device 3 on the heat exchanger side.

Controllers 4.5 of the thermal devices 2 and 3 are also electrically connected to the heat-retaining transport pipe 1, and the controllers 4.
, 5, signals are exchanged between them.

For example, when the controller 5 detects the temperature on the thermal equipment 3 side using the temperature sensor 6 and sends out the detection signal through the heat insulation transport pipe 1, the controller 4 receives this and based on the received signal, the temperature of the thermal equipment a2 is determined. control to increase or decrease. Further, when the thermal device 3 is turned on or off by the operation unit (not shown) of the two examples of thermal devices, the controller 4 sends an on/off signal to the heat insulation transport pipe 1, and the on/off signal is transmitted to the thermal device. 3
is received by the controller 5 on the side. The controller 5 turns on and off the thermal equipment 3 based on the received on/off signal.

By the way, when the thermal devices 2 and 3 are installed far apart, the heat insulation transport pipe 1 routed between them becomes long, and the metal pipe 1a in the pipe 1 has a structure in which multiple main lines are connected. becomes. If such a connection exists, the characteristic impedance of the high-frequency signal transmission line changes in this part, causing problems such as reflection and attenuation, which may reduce signal transmission efficiency and reliability. Become.

Generally, the characteristic impedance Zo of a coaxial line is expressed by the following equation.

In the formula, L is the inductance, C is the capacitance, ε is the dielectric constant of the insulator, dl is the outer diameter of the inner conductor, and d2 is the inner diameter of the outer conductor. As can be seen from the above formula, ε, d□, d
2, the characteristic impedance Zo can be changed.

Therefore, as shown in FIG. 3, the metal pipe la.

1a are interconnected by the connector nipple ld, and when the outer diameter of the metal part that becomes the center conductor becomes partially large, the inner diameter of the jacket IC is set so that dB/d2 is the same as that of the other parts in the above equation. By making it large, the characteristic impedance can be made uniform over the entire length of the line.

Furthermore, when the heat-retaining transport pipe 1 routed between the thermal devices 2 and 3 becomes long, it becomes necessary to support the pipe 1 midway. In this support part, a material with high density is used for the heat insulating material in this part so that the heat insulating material made of glass wool does not become depressed due to the weight of the heat medium transport pipe 1 and the support becomes unstable. Generally, the equivalent dielectric constant of a heat insulating material increases as its density increases.

Therefore, as shown in FIG. 4, the thickness of the support part insulating material 1b' of the part where the heat-retaining transport pipe 1 is supported by the support stand 1e is increased to make the characteristic impedance Zo uniform with that of other parts. Do it like this.

As mentioned above with reference to Figs. 3 and 4, by configuring the metal pipe connection part and pipe support part of the heat-retaining transport pipe, the characteristic impedance can be made uniform over the entire length of the pipe, and signal reflection and attenuation can be reduced. can do.

Furthermore, the signals transmitted through the heat insulation transport pipe 1 are sent by the controllers 5 and 6 from the connection parts with the thermal devices 2 and 3,
The information is received by the controllers 5 and 6 from the connecting portion, but in order to make this possible, it is necessary to perform the terminal treatment on the heat-retaining transport pipe 1 as shown in FIGS. 5 and 6.

The example shown in FIG. 5 is a case where the metal pipe 1a of the heat insulation transport piping 1 and the metal pipe 1a on the thermal equipment side are separated and are connected by a metal pipe connection union 1f, and both metal pipes la, Insulating gaskets 1g and 1h are attached to electrically isolate la.

The example in Figure 6 is a case where the metal pipe 1a is continuous to the inside of the thermal equipment and is not physically cut, and the same effect as electrically insulating the high frequency signal line by increasing the high frequency resistance is obtained. In order to achieve this, a ring-shaped ferrite material 11 that acts as a high frequency blocking material is attached to the outer periphery of the end portion of the metal pipe 1a.

As mentioned above with reference to Figures 5 and 6, by terminal-processing the heat-retaining transport piping, it is possible to prevent the signals transmitted through the piping from diffusing beyond the intended purpose, and even if the signals are diffused, the amount of Therefore, signals can be exchanged between controllers without significant signal attenuation.

In the illustrated embodiment, the heat-retaining transport piping transports a heat medium such as cold and hot water in the air conditioning system, but it is also possible to use the heat-retaining transport pipe as a coaxial line to transport hot water in the hot water supply system.

〔effect〕

As described above, according to the present invention, attention is paid to the fact that the heat-retaining transport piping has a similar structure to a coaxial line, and the heat-retaining transport pipe is designed to be used as a signal transmission line for exchanging signals between controllers of thermal equipment. Because the materials used for the piping components are selected, there is no need to install a separate signal line that is used only for sending and receiving signals, resulting in significant cost reductions and construction costs for systems such as air conditioning and hot water supply. Effects such as being able to achieve the desired results can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the signal transmission line device according to the present invention, FIG. 2 is a schematic diagram showing an example of an air conditioning system using the signal transmission line device of FIG. 1, and FIGS. The figure is a cross-sectional view showing a preferred embodiment in which the heat-retaining transport pipe is used as a signal transmission line device. 1... Heat insulation transport piping, 2, 3... Heat equipment, 1a...
・Metal pipe, 1b...Insulating material, IC...Outer cover, I
C'...Metal foil. Patent applicant Yazaki Sogyo Co., Ltd. Figure 1 (a) (b) Figure 2

Claims (1)

[Claims] It consists of a plurality of thermal devices, a metal pipe, a heat-retaining insulating material wound around the outer periphery of the metal pipe, and a protective and heat-reflecting outer covering provided on the outer periphery of the insulating material, and a heat medium,
In an air conditioning, hot water supply, etc. system that includes a heat-retaining transport pipe for transporting hot water, etc., and a control means provided in each of the plurality of devices, the heat insulating material is formed of a material with a low dielectric constant and good electrical insulation. At the same time, a highly conductive metal foil is applied to the surface of the outer sheath on the side of the heat insulating material, and a high frequency coaxial line is constructed in which the metal pipe is the center conductor and the metal foil of the outer sheath is the outer conductor. A signal transmission line device characterized in that signals are exchanged between the control means for controlling operation using a line.