JPH01173593A - Thermal sensor for plane heating element - Google Patents

Abstract

PURPOSE:To enable heating temperature to be detected without loosing flexibility and elasticity by constituting a sensor in such a structure that plural copper foil yarns are arranged in parallel as weft yarns ar regular intervals and ribbon- shaped thermal semiconductor resin materials made into flat yarns are woven to this copper foil yarns as warp yarns. CONSTITUTION:Plural copper foil yarns 7 are arranged in parallel at regular intervals as weft yarns in the longitudinal direction and ribbon-shaped thermal semiconductor resin materials 8 made into flat yarns are woven as warp yarns to these copper foil yarns 7 so as to form a sensor 6 in woven structure. As a result, the structure of the sensor 6 itself is also flat and abundant in flexibility and has sufficient elasticity. Hereby, a function for detecting the heat temperature can be added without loosing preferable characteristics such as flatness, flexibility, elasticity, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a heat-sensitive sensor for detecting heat generation temperature, which is used in heating appliances such as electric carpets and electric blankets, and is configured with a planar heating element. It is.

(Prior art) In order to achieve sufficient flexibility in recent heating appliances such as electric carpets and electric blankets so that they can be folded, the first step is to make them thinner and more flexible. However, from the viewpoint of providing a certain elasticity and making the feeling of use (touch) soft, the heating element (heater member) of the heating device itself has a flexible flat sheet heating element. The body is becoming more and more used. Such a sheet heating element is made by, for example, mixing conductive carbon and heat-resistant synthetic resin, and stretching and molding the mixture into a film shape, or by stretching it into a ribbon shape (tape shape) and combining it with a predetermined ribbon-shaped sheet material. Those woven by hand are generally used.

By the way, when a planar heat generating sheet with excellent flexibility is adopted as a heat generating member, it is not possible to control the heat generation temperature (automatic comfort temperature adjustment, overheating prevention) as is normally done with general heating equipment. To do this, it is first necessary to detect the heat generation temperature of the heating element with high accuracy.

Conventionally, the temperature of the generated heat is detected by winding a heat-sensitive wire 26 made of a conductive material in a coil shape around the outer periphery of a heat-sensitive resin core material 25 whose impedance generally changes depending on the temperature, for example, as shown in FIG. Using a so-called cord-type heat-sensitive sensor in which the electrode wire 27 is covered with an exterior insulating tube 28, the above-mentioned heat-generating temperature is determined by utilizing the impedance change of the heat-sensitive resin that changes according to the heat-generating temperature of the heating element. Many heat-sensitive sensors are used to detect

(Problem to be Solved by the Invention) However, if such a cord-type heat-sensitive sensor is applied to a planar heat-generating sheet as described above, the cord-type heat-sensitive sensor has a considerable outer diameter due to its structure. In addition, it has high rigidity and lacks flexibility, so the above-mentioned edge-shaped heat generating sheet is inherently thin, has high flexibility, flexibility,
There is a problem that almost all elasticity etc. are reduced.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the problems caused by the conventional heat-sensitive sensors as described above.
In order to solve this problem, a predetermined plurality of copper foil threads 7, 7, etc. are arranged in parallel at regular intervals as warp threads, and a predetermined plurality of copper foil threads 7, 7... as weft threads are used as warp threads. The above-mentioned copper foil threads 7, 7 are provided with ribbon-shaped heat-sensitive semiconductor resin material 8.8 woven into flat yarns in the cross direction.
. . . and the ribbon-shaped heat-sensitive semiconductor resin material 8.8 . . . are woven into a belt shape.

(Function) According to the problem solving means of the present invention, as described above,
First, a plurality of copper foil threads 7, 7... are arranged in parallel at regular intervals in the longitudinal direction as warp threads, and a ribbon-shaped thermosensitive material is formed into a flat yarn for the plurality of copper foil threads 7, 7... The semiconducting resin material 1.8... is woven into the fabric as weft threads to form a sensor electrode having a woven structure. As a result, the structure of the thermal sensor itself is flat, highly flexible, and has sufficient elasticity, while the plurality of copper foil threads 7. The ribbon-shaped heat-sensitive semiconductor resin materials 8, 8, etc. are arranged in parallel and accurately adjacent to each other at regular intervals. The gap value is accurately determined according to the thickness 14 of the heat-sensitive semiconductor resin material turned into a flat yarn, and by simply changing the thickness of the heat-sensitive semiconductor resin material, the distance between the adjacent non-copper foil yarns can be adjusted. The impedance, that is, the impedance between the positive and negative electrodes can be set to an arbitrary value.

(Embodiment) FIGS. 1 to 5 show the structure of an embodiment of the present invention applied to, for example, an electric carpet.

First, FIG. 1 shows the planar structure of the entire body of the edge-like heat generating sheet forming the heat generating part of the electric carpet 100 as shown in FIG. These flat yarns 1, 1, . . . are a plurality of flat yarns of a predetermined width made of a film material material, and each of these flat yarns 1, 1, . It is supposed to form. Further, the symbol 2.2... is the flat yarn 1
, 1... is a ribbon-shaped sheet heating element made of a conductive material made into flat yarn and having a predetermined resistivity. The ribbon-shaped planar heating elements 2.2 are each made of a conductive carbon material and a heat-resistant (for example, about 200°C) synthetic resin material such as tetrafluoroethylene in a predetermined ratio using the latter as a base material. The film material is mixed with a film material having a thickness of 0.075 to 0.14+++ m by a molding method such as drawing molding, and is then cut into a ribbon shape. It also has a high watt density of 0.2 W/cm' per unit area.

The ribbon-shaped planar heating elements 2,2... are woven together with the flat yarns 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,, 2,, 2,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,. It constitutes a planar heat generating sheet main body 5 having a tissue structure.

On the other hand, reference numeral 6 designates a flat thermal sensor (plastic thermistor) for a thermostat which is bound at predetermined intervals in the warp direction of the planar heat generating sheet main body 5, and the thermal sensor 6 is, for example, As shown in FIGS. 2 to 4, a plurality of copper foil threads 7° 7.. extend in the warp direction, similar to the above-mentioned planar heating elements 2.2. On the other hand, a plurality of ribbon-shaped heat-sensitive semiconductor resin materials 8,8, which have been made into flat yarns, are woven into a plain weave state as wefts to form a band-like structure as a whole, and the band-shaped heat-sensitive sensor 6 is made of the above-mentioned copper. Foil thread 7.7
... are integrally sewn to the planar heat generating sheet main body 5 by spun threads 9, 9, etc., which run in the warp direction while being sewn together in the vertical direction between and at both ends thereof.

The copper foil threads 7, 7, etc. function as highly flexible and highly conductive electrode wires, and each adjacent copper foil thread 7, 7, etc. has a positive electrode (10) and a negative electrode (-). On the other hand, the ribbon-shaped heat-sensitive semiconductor resin material 8.8
... has a negative impedance characteristic with respect to temperature, and the impedance is changed according to the heat generation temperature on the side of the planar heat generating sheet main body 5 that is in surface contact.

As a result, the current value (or its frequency) flowing between the positive and negative electrodes made of the mutually adjacent copper foil threads 7, 7, etc. changes, thereby automatically changing the heat generation temperature of the planar heat generating sheet body 5. be detected.

In this case, the initial value of the above isobedance (standard setting value)
As understood from FIG. 3, is determined by the inherent resistivity of the heat-sensitive semiconductor resin material 8.8 and the gap (11) between the positive and negative electrodes (between adjacent copper foil threads 7.7),
In the case of this embodiment, this is ultimately determined by the thickness of the ribbon-shaped heat-sensitive semiconductor resin material 8,8, . . . in the above-mentioned woven state and the number of spun yarns 9. Therefore,
If the thickness d of the ribbon-shaped heat-sensitive semiconductor resin material 8.8... and the number of spun threads 9 are set accurately, the initial value of the impedance can be set extremely accurately, and the thickness d Since it is extremely easy to set the number of spun yarns 9, the set value can be arbitrarily and easily selected, and it can be applied to products of various heat capacities with a high degree of freedom. The planar heating elements 2, 2, etc. on the side of the planar heating sheet main body 5 have power supply lines (not shown) at both ends, and the copper foil threads 7, 7, etc. of the thermal sensor 6 have the same detection. The lines are connected to each other. Both the power supply line and the detection line are connected to the controller 11 of the electric carpeller 100.

In the above embodiments, a case where a sheet heating element with a woven structure is used as the sheet heating sheet main body 5 to which the thermal sensor 6 of the present invention is applied was explained. The heating element may be in the form of a film, for example,
It can be arbitrarily applied to various forms. In addition, in the above embodiment, the adjacent copper foil threads 7.7
The gap (11) between them is filled with the heat-sensitive semiconductor resin material 8.
In addition to the thickness d, the thickness d can be arbitrarily varied by intervening a spun yarn 9. For example, as another example, as shown in FIG. 6, the use of the spun yarn 9 is stopped and To realize a tight weave structure in which only the thickness d of the semiconductor resin material 8 is adjusted to a certain degree and the resin material 8 is wound around the copper foil thread 7 by more than 1/2 turn. Needless to say, it can also be adjusted by

(Effects of the Invention) As explained above, the thermal sensor for a planar heating element of the present invention has a predetermined plurality of copper foil threads 7.7 arranged in parallel at regular intervals as warp threads, and Flat yarn ribbon-shaped heat-sensitive semiconductor resin material 8. woven in a cross direction with a predetermined plurality of copper foil threads 7.7.
8..., and is characterized in that the copper foil threads 7.7... and the ribbon-shaped heat-sensitive semiconductor resin material 8.8... are woven into a belt shape.

That is, in the configuration of the present invention described above, first, a plurality of copper foil threads 7, 7... are arranged in parallel at regular intervals in the longitudinal direction as warp threads, and at the same time, with respect to these plural copper foil threads 7, 7... Ribbon-shaped heat-sensitive semiconductor resin material 8.8, which has been made into flat yarn, is woven as a weft to form a sensor electrode having a woven structure. As a result, the structure of the thermal sensor itself is flat, highly flexible, and has sufficient elasticity.

Therefore, first of all, according to the configuration of the present invention, it is possible to add the function of detecting the heat generation temperature without losing the flatness, flexibility, elasticity, and other favorable properties of the planar heating element to which it is applied. This makes it possible to effectively utilize the inherent characteristics of the planar heating element.

Next, a plurality of copper foil threads 7, 7, .
8..., the flat yarns of the heat-sensitive semiconductor resin material are arranged in parallel and accurately adjacent to each other at regular intervals, so that the gap value between the adjacent copper foil threads 7.7 is 8°. 8. The impedance between the adjacent copper foil threads 7.7 can be determined accurately according to the thickness d of the heat-sensitive semiconductor resin material 8.8. That is, it becomes possible to set the impedance between the positive and negative electrodes to an arbitrary value with high precision. Therefore, temperature control using the heat-sensitive sensor of the present invention is extremely accurate and highly functional.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the overall structure of a planar heat-generating sheet body equipped with a heat-sensitive sensor according to an embodiment of the present invention, and FIG. 2 is an enlarged plan view of the heat-sensitive sensor, which is the main part of the structure of the embodiment. Figure 3 is a cross-sectional view of the heat-sensitive sensor electrode section in the warp direction (cross-sectional view taken along line A-A in Figure 2), and Figure 4 is a cross-sectional view of the heat-sensitive sensor in the weft direction (cross-sectional view taken along line B-B in Figure 2). Fig. 5 is a plan view of an electric carpet using the planar heating sheet body shown in Fig. 1 above, and Fig. 6 is Fig. 3 showing the electrode structure of a heat-sensitive sensor in another embodiment of the present invention. The same sectional view, FIG. 7, is a perspective view showing the structure of a conventional heat-sensitive wire for detecting heat generation temperature. ■...Flat yarn 2...Planar heating element 2'...Sensor side heating element 6...Thermal sensor 7...Copper foil thread 8... ...Heat-sensitive semiconductor resin material 9 ... Spun yarn

Claims (1)

[Claims] 1. A predetermined plurality of copper foil threads (7), (7) arranged in parallel at regular intervals as warp threads and a predetermined plurality of copper foil threads (7), (7)... as weft threads intersect with each other. The above-mentioned copper foil thread (7) is provided with a ribbon-shaped heat-sensitive semiconductor resin material (8), (8), etc., which is woven into a flat yarn in the direction of the wire.
(7)... and the above ribbon-shaped heat-sensitive semiconductor resin material (8)
, (8)... is woven into a band shape to form a thermal sensor for a sheet heating element.