JPS6155880A - Panel heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a surface heating element used for floor heating etc., and more specifically, it has a temperature sensor and a heating layer sandwiched between upper and lower insulating layers, The present invention relates to a surface heating element in which the energization state of a heat generating layer is controlled by a control device based on detected information on temperature.

[Prior art]

Conventionally, as the above-mentioned surface heating element, a resistance heating wire appropriately arranged in the heating layer was used, a resistance heating element with an appropriate pattern shape was used as a substitute for the resistance heating wire, and a resistance heating element with parallel ends was used. There are known methods that use conductive paint to connect parallel electrodes and the parallel electrodes. However, conventional surface heating elements, including those using the above-mentioned resistive heating wire coated with insulation, as well as other types, have safety concerns in the event of insulation failure in the upper or lower insulation layer of the heating layer. There wasn't much to see in terms of countermeasures.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and provides a surface heating element in which the heating layer is not energized if an insulation failure occurs in the upper insulation layer, which is particularly important for safety. It is.

[Structure of the invention]

The present invention provides a surface heating element that has a temperature sensor and a heat generation layer sandwiched between upper and lower insulating layers, and in which a control device controls the energization state of the heat generation layer based on information detected by the temperature sensor. A surface heating element is provided with at least a conductive layer thereon, and when conduction occurs between the heating layer and the conductive layer, the control device prevents the heating layer from being energized. The above objective has been achieved.

〔Example〕

The present invention will be described below with reference to illustrated examples.

Fig. 1 is a partial sectional view showing an example of the surface heating element of the present invention;
The figure is a partial perspective view showing an example of a heat generating layer, and FIG. 3 is a circuit diagram showing an example of a control device.

The surface heating element shown in FIG. 1 consists of, in order from the bottom, a wooden board 1, a lower insulating layer 2 of polyester film, a heat generating layer 3 having the structure shown in FIG. 2, an upper insulating layer 4 made of low melting point polyamide resin, A conductor made of metal foil or metal deposited layer? i
J 5 , a protective layer 6 of polyester film, and a laminate of a decorative layer N7 made of textiles, non-woven fabrics, etc., and at the ends there are connecting fittings 8 and 9 for heating elements, and connecting fittings 1 for temperature detection.
A frame body 13 made of resin such as polyvinyl chloride is provided, in which a connecting fitting 12 for earth leakage detection is embedded.

The heat generating layer 3 shown in FIG.
The electrode 3 is formed by applying a conductive resin on the lower insulating layer 2 provided with υ, and the conductive resin layer is parallel to the electrode 3.
The part that connects the portions a becomes the heating element 3b. An example of forming this conductive resin layer is to apply a resin liquid adjusted to the composition shown in the table below using a knife coating method, and
After drying at 150° C., heat setting is performed at 150° C. to form a layer with a thickness of 50 microns, and the portion between the parallel electrodes 3a becomes a good heating element 3b.

Resin liquid composition Acrylic emulsion 50 parts by weight Carbon black 50 1 Synthetic mica sol 10I Melamine Tree Mangen
II catalyst 0.1
#Wed 20
1 Foaming stabilizer 8I Thickening agent Appropriate amount Stock solution Viscosity 4,0OOPS Foaming
The magnification is 3 times, the foaming viscosity is 15,0OOPS, and the heating layer 3 in Figure 2 is
The parallel electrodes 3a are connected to the heating element connecting fittings 8 and 9 by conductive wires at the ends slightly protruding from the ends of the lower insulating layer 2, and a temperature sensor 14 consisting of a thermistor is connected to the heating element 3.
b, and their connecting conductors extend toward the heating element connecting fitting 8.9, and a temperature sensor connecting fitting 10.11 is provided at the end thereof. The conductor wires and connecting fittings that protrude from the ends of these lower insulation fri2, that is, the ends of the laminated layers, should be
It is embedded in the frame 13 when the frame 13 is formed by injection molding or the like together with the earth leakage detection connecting fitting 12 provided at the end of the conductive wire connected to the layer 5 .

The conductive layer 5 sufficiently functions as a leakage sensor with a thickness of about 20 microns, not only when a metal foil is used, but also when a vapor deposited layer is used. In order to protect this conductive layer 5, a protective N
6 is preferably provided as in the illustrated example, but the decorative layer 7
The protection N6 may also be used. This decorative layer 7, protective layer 6, and wooden board 1 are not necessarily required to be provided. In addition, the frame 13 does not need to be provided separately from the laminate by using conductive wires coated with insulation and connecting fittings coated with insulation on the outside, and embedding them appropriately within the laminate. You can do that.

In the surface heating element of the present invention, a control device as shown in FIG. 3 connected to a power source is connected to the surface heating element main body formed as described above. That is, in FIG. 3, the same reference numerals as in FIGS. 1 and 2 indicate the same functional members, and when the upper insulation m4 has good insulation, since lt[5 is in a floating state, the transistor 15 is conductive. state, the transistor 16 becomes non-conductive, and the comparator 17
turns on and off the triac 18 based on the information from the temperature sensor 14, thereby controlling the energization of the heating element 3b. However, if the insulation of the upper insulating layer 4 becomes defective, the conductive layer 5 and the heating element 3b is short-circuited, the transistor 15 becomes non-conductive and the transistor 16 becomes conductive. As a result, the temperature sensor 14 becomes short-circuited and provides high temperature information to the comparator 17. Part 1
7 turns off the triac 18 and stops energizing the heating element 3b. As a result, the surface heating element of the present invention has excellent safety. Note that the control device shown in FIG.
A 606F amplifier is used.

〔Effect of the invention〕

In the surface heating element of the present invention, a conductive layer is provided on the side opposite to the heat generating layer of the insulating layer, and information about the conductive layer that changes depending on whether or not the insulating layer is in a good insulation state is sent to the temperature control device of the heat generating layer. /
By simply using the information in the same manner as above, it has the excellent effect of guaranteeing safety against insulation defects, which conventional surface heating elements do not have.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view showing an example of the surface heating element of the present invention;
The figure is a partial perspective view showing an example of a heat generating layer, and FIG. 3 is a circuit diagram showing an example of a control device. 1... Wooden board, 2... Lower insulating layer, 3...
・Heating layer, 3a... Electrode, 3b... Heating element, 4... Upper insulating layer, 5... Conductive layer,
6... Protective layer, 7... Decorative layer, 8.9... Connection fitting for heating element, 10.11... Connection fitting for temperature sensor, 12... Connection fitting for earth leakage detection, 13. ...Frame body, 14...Temperature sensor,
15.16...Transistor, 17...Comparison section, 18...Triac.

Claims (1)

[Scope of Claims] 1. A surface heating element that has a temperature sensor and a heat generation layer sandwiched between upper and lower insulating layers, and in which the energization state of the heat generation layer is controlled by a control device based on information detected by the temperature sensor, A surface heating element characterized in that at least a conductive layer is provided on the upper insulating layer, and when electrical conduction occurs between the heat generating layer and the conductive layer, the control device prevents energization of the heat generating layer. 2. The surface heating element according to claim 1, wherein the heating layer is one in which a voltage is applied between conductors extending in parallel, and the conductive resin layer containing a conductive substance between the parallel conductors generates heat. . 3. The surface heating element according to claim 1 or 2, wherein a protective insulating layer is provided on the conductive layer. 4. The surface heating element according to claims 1 to 3, wherein a wooden board is bonded to the lower surface of the lower insulating layer.