JPH0592989U - Sheet heating element - Google Patents

Abstract

(57) [Abstract] [Purpose] A sheet-like temperature sensing element attached to a planar heating element is used to provide a planar planar heating element with a temperature sensing function that does not cause unevenness on the surface. obtain. [Structure] A sheet-shaped temperature sensitive body having a characteristic that a phase angle changes according to temperature and a sheet-shaped conductor are sequentially laminated on one side surface of the sheet-shaped resistor, and these are covered with an insulating sheet.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sheet heating element used for a warming tool such as a bed warmer and an electric carpet.

[0002]

[Prior Art]

 In the conventional sheet heating element, both sides of a sheet resistor are covered with insulating sheets.When using this for a bed warmer, etc., one surface of the sheet heating element should be equipped with a heat-sensitive wire for temperature detection. The temperature control is performed based on the temperature signal of this heat sensitive wire.

[0003]

[Problems to be solved by the device]

 Since the heat-sensitive wire attached to the sheet heating element would make the product unpleasant by making it uneven, it was necessary to use a protective material having a considerable thickness. Therefore, there is a problem that the thickness of the product increases and the weight also increases. In addition, the conventional temperature control device that uses a heat-sensitive wire is a method that detects changes in the absolute value of the heat-sensitive wire impedance, so the control temperature also changes when the size of the heat-sensitive wire attached to the planar heating element changes. There is.

It is an object of the present invention to provide a planar heating element having a temperature sensing temperature sensing element in a planar shape without irregularities. In addition, the planar heating element in which the temperature sensing element is integrated is a new proposal for detecting and controlling the phase angle of the temperature sensing element disclosed in Japanese Patent Application No. 2-319320 related to the previous application. The technology enables temperature control that is not affected by size and other dimensions.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in the sheet heating element of the present invention, a sheet-shaped temperature sensing element having a characteristic that the phase angle changes with temperature regardless of size is attached to one side surface of the sheet-shaped resistor. Then, a sheet-like conductor is laminated on the temperature sensitive body, and the conductor and the outer surface of the resistor are integrally covered with an insulating sheet.

[0006]

[Action]

 The entire sheet heating element, including the temperature sensing element for temperature detection, is a thin sheet with no irregularities. Therefore, products such as bed warmers are flat, lightweight products with flexibility. To be finished.

An alternating current is applied between the sheet heating element and the conductor, and the voltage applied to the temperature sensing element and the phase angle of the current flowing therethrough change according to the temperature. It is used for temperature detection.

[0008]

【Example】

 FIG. 1 is a perspective view of the sheet heating element 1 according to the present invention with a part cut away. Is one in which a conductive paint is arranged in a foil shape to obtain a desired resistance value, and electrode wires 3, 3 for applying a power source are provided on both sides of the foil.

To the resistor 2, a sheet-shaped temperature sensitive body 4 having a characteristic that the phase angle changes with temperature regardless of the size, such as a polymer compound containing an ionic impurity carrier, is adhered to the resistor 2 with substantially the same width. Further, the sheet-shaped conductor 5 is closely adhered to the temperature sensitive body 4 with substantially the same width. Although the resistor 2, the temperature sensor 4 and the conductor 5 have almost the same width, the size and shape are not limited as long as the resistor 2 and the conductor 5 are not in direct contact with each other and can be arbitrarily selected.

The outer surface of each of the sheet-shaped conductor 5 and the resistor 2 is covered with an insulator 6 such as a vinyl chloride sheet which is slightly wider than this. This coating may be in the shape of a bag, but it is easier to use if it is adhered to the resistor 2 and the conductor 5 because the air does not expand.

Power is applied to the resistor 2 and the conductor 5 by cutting off a part of the insulator 6 and connecting a power supply line (not shown) to each of the parts.

The phase angle of the temperature sensing element 4 is about 0.4π radian to about 0.03π radian from 0 ° C. to 70 ° C. when a general commercial power source (50 to 60 Hz) is applied to the resistor 2 and the conductor 5. If the temperature changes to about A, it is sufficiently practical for bed warmers.

FIG. 3 shows another embodiment of the present invention, in which the resistor 2 is a string-shaped heating wire, the conductor 5 is a mesh or a grid, and the width of the temperature sensitive body 5 is the resistor 2 and the conductor. It is wider than 5. In this case, the presence of the gap improves the stretchability, and the weight can be reduced.

[0013]

[Effect of the device]

 Since the present invention is configured as described above, it is possible to make a planar heating element having a temperature sensing temperature sensing element into a flexible planar shape, and the applied product is also uneven. It can be thin and light.

Further, since the temperature-sensing body is integrated with the planar heating element, it is possible to eliminate the work process of mounting the temperature-sensing heat-sensitive wire as in the conventional case during product assembly, which contributes to cost reduction. To do.

When the sheet heating element is cut into a desired length for use, if the temperature is controlled by the above-mentioned prior art, the control temperature becomes constant regardless of the cutting length.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a sheet heating element of the present invention.

FIG. 2 is an enlarged cross-sectional view of a portion indicated by line AA in FIG.

FIG. 3 is a partially cutaway perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Sheet heating element 2 Resistor 3 Electrode wire 4 Temperature sensor 5 Conductor 6 Insulator

Claims (1)

[Scope of utility model registration request] 1. A sheet-shaped temperature sensitive body having a characteristic that a phase angle changes with temperature regardless of dimensions is closely attached to one side surface of the sheet-shaped resistor, and a sheet-shaped conductor is laminated on the temperature sensitive body. A planar heating element, wherein the conductor and the outer surface of the resistor are integrally covered with an insulating sheet.