JPH0632264B2 - Temperature control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device used for a planar heating tool represented by an electric carpet.

2. Description of the Related Art Conventionally, as shown in FIG. 5, a temperature detecting wire 6 and a heater wire 7 are wired in the main body of a large-sized sheet heating device such as an electric carpet, and the temperature is controlled by an electronic control circuit in a controller box 9. Method is adopted. In this case, the power source is usually connected to a commercial power source and driven by an AC voltage of 100V.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In such an electric warming tool, a high voltage close to 100 V is applied to the temperature detection wire 6 and the heater wire 7 in the main body of the warming tool, so that it is thick from the danger of the electric appliance control method and electric shock. Insulation must be applied to the temperature sensing wire and heater wire. Therefore, since each wire is thick and cannot be crossed from the point of feeling, a long temperature detection wire is required, that is, a wire with an insulation coating of 0.3 mm or less cannot be used. There is a problem that the shaped electric wire cannot be wired in the main body of the electric heating tool. Therefore, there are problems such as the cost of the electric wires to be arranged and the wiring shape being exposed on the surface cloth after wiring.

The present invention solves the above-mentioned problems of the prior art, and makes it possible to dispose a thin temperature detection wire, which has been impossible in the past.

Means for Solving the Problems The present invention uses a thin temperature detection wire having an outer diameter of 2 mm or less in which a polymer temperature sensing element is arranged between a pair of electrodes, and is connected to a low voltage circuit. The electric power control circuit detects a temperature signal from the thin temperature detection line and controls energization of the heater wire connected to the commercial power source by the detection signal.

Since the working temperature detection line uses a linear shape with an outer diameter of 2 mm or less,
The wiring of the surface heating device etc. does not become conspicuous due to unevenness, and the thin temperature detection line operates in the low voltage circuit, so electrical safety is improved and cost can be reduced.

Example One example of the present invention will be described below. As shown in FIG. 4, a thin temperature detection wire 8 can be used for the heater wire 7, and the local temperature can be detected sufficiently with the thin temperature detection wire having a very short length. FIG. 1 shows a block diagram of the temperature control circuit of the present invention in the controller box 9 for controlling. The thin temperature detection line 8 is connected to the temperature detection circuit 13 whose voltage is lowered by the transformer 12, and the photocoupler 10 is illuminated by the temperature output thereof. In response to this signal, the power control circuit 15 connected to the AC power supply (100V) 14 operates to excite the relay 11 and turn ON / OFF the energization of the heater wire 7. In this electric circuit, the low-voltage temperature detection circuit 13 is a low-voltage circuit, and the heater line 7 connected to the commercial power source 14 and the power control circuit 15 are not connected to the photocoupler 1.
It is isolated by 0. When the low-voltage temperature detection circuit 13 is isolated in this way, the temperature detection line 8 is independent of the commercial power supply circuit, so that even if it is provided in the main body, the risk is much lower and the temperature is safe. Sex increases.

As described above, in the present invention, the thin temperature detection wire 8 having an outer diameter of 2 mm or less is arranged in the main body, and this is driven by a low voltage circuit,
Take out the temperature signal. The low voltage circuit referred to here is a circuit which is dropped by the transformer 12 and has a voltage of about 10 V or less, to which a voltage of a safe level to which the Electrical Appliance and Material Control Law is not applied is applied. When the heater wire 7 is energized by the temperature signal of the thin temperature detection wire 8 and the temperature is controlled, the heater wire is wired, but the heater wire 7 directly uses the commercial power supply voltage to generate heat. Is efficient. At this time, the low-voltage temperature detection circuit 13 that detects the temperature signal of the temperature detector 8 transmits the temperature signal output to the power control unit, but since the power control circuit 15 is driven by the commercial power supply voltage 14, It is desirable that the power control unit and the low voltage temperature detection circuit 13 are electrically isolated from the viewpoint of safety when the circuit is at home. As means for this isolation, in the present invention, for example, a photo coupler 1 is used.
0 was used.

The thin temperature detecting wire used in the present invention is configured as a wire having an outer diameter of 2 mm or less, and is characterized in that its insulating jacket can be 0.3 mm or less. The configuration of this thin temperature detection line will be described below.

The temperature detection line used in the present invention may have any structure as long as it is thin, but it is typically constructed as shown in FIGS. 2 and 3. The polymer temperature sensitive body 3 is interposed between the pair of electrodes 2 and 4 to detect the temperature.
It is efficient to configure the cross-sections to be concentric as shown in Figs. As the inner electrode, the foil-making conductor wire 2 may be spirally wound around the core yarn 1 as shown in FIG. 2, or the conductive core yarn 6 may be used as shown in FIG. In any case, this core thread also functions as a tension member. The core yarn of the present invention has a tenacity of not more than 1000 denier.
It is desirable to use more than kg. Specific fibers include aromatic polyamide, aromatic polyester or copolymers thereof, and as commercially available products, Kepler (DuPont), Technora (Teijin Co., Ltd.), Vectran (Kuraray Co., Ltd.), Econol fiber There are strong fibers such as (Sumitomo Chemical Co., Ltd.). As the conductive core yarn, carbon fiber, metal fiber or the like can be used.

The polymer temperature sensor used in the present invention may be any of an ionic conduction type, a capacitance change type and an electronic conduction type, but the ionic conduction type is most practical. A low-voltage alternating voltage, for example, 10 V is applied to.

The voltage applied to the thin temperature detection line needs to be low, but the voltage waveform may be configured according to the characteristics of the polymer temperature sensor used.

The low-voltage temperature detection circuit 13 in the present invention does not necessarily need to be isolated from the power control, but isolation is desirable from the viewpoint of safety.

EFFECTS OF THE INVENTION As described above, the present invention is to provide a sheet-like warming tool which has high safety against electricity, is excellent in low cost, has an inconspicuous wiring, and has a good texture, and is most suitable for application to an electric carpet. It is effective.

[Brief description of drawings]

FIG. 1 is a block diagram of a temperature control circuit according to an embodiment of the present invention, FIGS. 2 and 3 are side views showing an example of a thin temperature detection line used in the present invention, and FIG. FIG. 5 is a plan view showing an example of the main body wiring of the carpet, and FIG. 5 is a plan view showing the main body wiring of the conventional electric carpet. 1 ... core thread, 3 ... polymer temperature sensitive layer, 6 ... conductive core thread,
7 ... Heater wire, 8 ... Thin detection wire, 10 ... Photocoupler, 11 ... Relay, 12 ... Transformer.

Claims (3)

[Claims] 1. A planar warming tool body having an intersecting portion where a thin detection wire and a heater wire wired on a planar heat insulating substrate cross each other, wherein the thin detection wire is between a pair of electrodes. A wire with an outer diameter of 2 mm or less, which is provided with a polymer temperature sensor, is connected to a low voltage circuit electrically insulated from a commercial power source, and detects a temperature signal from the thin detection wire. A temperature control device for controlling energization of a heater wire connected to the commercial power supply. 2. The thin temperature detection wire has a strength of 10 kg or more and 10
The temperature control device according to claim 1, comprising a core yarn having a denier of 00 denier or less and an insulating jacket having a denier of 0.3 mm or less. 3. The temperature control device according to claim 2, wherein the core yarn is made of conductive high-strength fiber and functions as an inner electrode.