JP3023053U - Safety device for sheet heating element - Google Patents

Abstract

(57) [Summary] [Structure] Electrode strips are provided on both side edges of the heat generating sheet, an insulating sheet is overlaid on the front and back surfaces of the heat generating sheet, and a heat sensitive wire is arranged on the outer side surface of the insulating sheet. In the safety device of the planar heating element, which supplies power to the electrode strips on both side edge portions of the heat-generating sheet and shuts off power supply to the heat-generating sheet in response to the signal of the heat-sensitive sheet, the heat-sensitive line is configured. , The circumference of the conductor is covered with a heat-sensitive resin layer, the periphery of the heat-sensitive resin layer is covered with a shield layer, the outer periphery of the shield layer is covered with an insulating layer, the heat-sensitive resin layer is melted at a predetermined temperature, and the conductor wire is applied by an external force. This is a safety device for a planar heating element that short-circuits the shield and the shield, and supplies a current to the heat-sensitive wire as a signal. [Effect] Since the heat-sensitive wire can generate a signal by short-circuiting the conductive wire and the shield corresponding to a partial temperature, it is possible to easily detect local overheating of the insulating sheet. is there.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a safety device for a sheet heating element using a heat-sensitive wire, which is used as a safety device for electric rugs and the like.

[0002]

[Prior art]

 In the conventional safety device of this type, an insulating sheet is placed on the front surface and the back surface of a heat generating sheet, and a heat sensitive wire is arranged on the outer surface of the insulating sheet. The change is detected, and when the temperature exceeds a predetermined value, the power supply to the heat generating sheet is cut off via the control unit.

[0003]

[Problems to be Solved by the Invention]

 However, in such a conventional safety device, the temperature-sensitive wire detects the temperature change by comprehensively measuring the impedance change in the entire insulating sheet, so that the local overheating of the insulating sheet may not be detected. There was an inconvenience.

An object of the present invention is to eliminate such inconvenience.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in a safety device for a sheet heating element according to the present invention, electrode strips are provided on both side edge portions of the heating sheet, and insulating sheets are superposed on the front surface and the back surface of the heating sheet. In addition, a heat-sensitive wire is arranged on the outer surface of the insulating sheet, power is supplied to the electrode strips at both end edges of the heat-generating sheet, and power supply to the heat-generating sheet is cut off by the signal of the heat-sensitive wire. In the safety device for planar heating element,

In constructing the heat-sensitive wire, the periphery of the conductor wire is covered with a heat-sensitive resin layer, the periphery of the heat-sensitive resin layer is covered with a shield layer, and the outer periphery of the shield layer is covered with an insulating layer. A signal of the heat-sensitive wire is obtained by melting the layer at a predetermined temperature and short-circuiting the conductive wire and the shield by an external force.

[0007]

[Action]

 Since the safety device for a sheet heating element according to the present invention is configured as described above, the heat-sensitive wire should short-circuit the conductor wire and the shield in response to a partial temperature and emit the signal. You can

[0008]

【Example】

 1 is a perspective view of the planar heating element, FIG. 2 is an enlarged partial sectional view taken along line II-II in FIG. 1, and FIG. 3 is an enlarged view of a portion III in FIG.

In FIG. 1 and FIG. 2, 10 is a planar heating element, and an electric insulating sheet (such as vinyl chloride sheet) 30 is provided on the front and back surfaces of a heating sheet (for example, cloth coated with carbon solution) 20. , 30 are attached in a stacked state. Reference numerals 11 and 11 denote electrode bands, which are woven in at both end portions of the heat generating sheet 20. Lead wires 111, 111 extend from the electrode strips 11, 11 and are connected to a control section C as shown in FIG.

Reference numeral 50 denotes a heat-sensitive wire, which is attached to the outer surface of the electric insulation sheet 30 in a meandering shape. A lead wire 501 extends from the heat-sensitive wire 50 and is connected to the control section C. Based on the signal from the heat sensitive wire 50, the control unit C shuts off the power supply to the heat generating sheet 10.

Next, the structure of the heat-sensitive wire 50 and its signal will be described with reference to FIG. Reference numeral 51 is a conductor of the heat-sensitive wire 50, and 52 is a heat-sensitive resin layer covering the periphery of the conductor 51. The heat-sensitive resin layer 52 is made of nylon resin having a melting point of about 100 ° C. Reference numeral 53 is a shield layer, which covers the periphery of the thermosensitive resin layer 52. Further, 54 is an insulating layer, which covers the outer periphery of the shield layer 53. When a temperature of about 100 ° C. is sensed at an appropriate position of the heat-sensitive wire 50 having such a structure, the heat-sensitive resin layer 52 is melted and the lead wire 51 and the shield 53 are short-circuited by an external force, and the lead wire 50 1 The signal is transmitted to the control section C by applying a current to the control section C.

In FIG. 1, reference numeral 60 denotes a thermosensor installed on the outer surface of the electric insulating sheet 30, which is connected to the control section C via a lead wire 601 and keeps the temperature of the sheet heating element 10 constant. This is for sensing and feeding back the temperature of the sheet heating element 10 in a feedback manner.

In the planar heating element safety device of this embodiment, when the power E is turned on, a current flows through the heating sheet 11 via the control section C, and the planar heating element 10 generates heat. In such a state, if the heat-generating sheet 11 is locally overheated, the heat-sensitive resin layer 52 of the heat-sensitive wire 50 is melted, and the lead wire 51 and the shield 53 are short-circuited by an external force, so that the lead wire 501 receives a current. Flows, the control unit C is operated, the supply of current to the heat generating sheet 11 is stopped, and the planar heating element 10 is prevented from overheating.

[0014]

【The invention's effect】

 In the safety device for a sheet heating element according to the present invention, electrode strips are provided on both side edge portions of the heating sheet, and insulating sheets are superposed on the front and back surfaces of the heating sheet, and the outer surface of the insulating sheet is provided. In a safety device for a sheet heating element, a heat-sensitive wire is arranged on the heat-generating sheet, and power is supplied to the electrode strips on both side edges of the heat-generating sheet, and the power supply to the heat-generating sheet is shut off by a signal of the heat-sensitive sheet.

In forming the heat-sensitive wire, the periphery of the conductive wire is covered with a heat-sensitive resin layer, the circumference of the heat-sensitive resin layer is covered with a shield layer, and the outer periphery of the shield layer is covered with an insulating layer. Since the layer is melted at a predetermined temperature, the conductor wire and the shield are short-circuited by an external force, and the electric current is made to be a signal of the heat sensitive wire, the heat sensitive wire corresponds to a partial temperature and the conductor wire and the shield. And can be short-circuited and the signal can be emitted.

Therefore, by using this safety device for a sheet heating element, it is possible to easily detect local overheating of the insulating sheet.

[Brief description of drawings]

FIG. 1 is a perspective view of a sheet heating element according to the present invention.

FIG. 2 is an enlarged partial sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged view of a part III in FIG.

[Explanation of symbols]

 10… Sheet heating element 11… Electrode strip 20… Heating sheet 30… Insulation sheet 50… Heat-sensitive wire 51… Conductive wire 52… Heat-sensitive resin layer 53… Shield layer 54… Insulation layer

Claims (1)

[Scope of utility model registration request] 1. A heat generating sheet is provided with electrode strips on both side edge portions thereof, an insulating sheet is superposed on a front surface and a back surface of the heat generating sheet, and a heat sensitive wire is arranged on an outer side surface of the insulating sheet. In a safety device for a sheet heating element, which supplies power to the electrode strips on both side edge portions of the sheet and shuts off power supply to the heat-generating sheet in response to a signal from the heat-sensitive sheet, in constructing the heat-sensitive line, a periphery of a conductor wire is provided. Is coated with a heat-sensitive resin layer and the periphery of this heat-sensitive resin layer is covered with a shield layer, and the outer periphery of this shield layer is covered with an insulating layer,
A safety device for a sheet heating element, characterized in that the heat sensitive resin layer is melted at a predetermined temperature, and the conductor and the shield are short-circuited by an external force to obtain a signal of the heat sensitive wire.