JPS63108691A - Heat-sensitive heating element - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention is used for electric blankets, electric carpets, and the like. The present invention relates to a heating element having a temperature sensing function in which one temperature sensing electrode also serves as a heating wire, a so-called thermosensitive heating element.

(Background Art) This type of heat-sensitive heating element includes a heat-sensitive sheet heating element shown in Fig. 5 or a heat-sensitive cable (so-called -wire type) shown in Fig. 6.
It has been put to practical use in electric blankets, electric carpets, etc. In FIG. 5, 1 is a heat generating electrode, 2 is a temperature sensing electrode, 3 is a split reflective electrode, 4a is an insulating layer such as a polyester film, 4b is an insulating layer/thermal adhesive layer such as a polyethylene film, and 7a is a heat sensitive material (Nyl・In Figure 6, which shows 2 series), 5 is a core like polyester twine, 6
7b is a heat-sensitive material (PVC type); 8 is an outer-winding temperature sensing electric bridge; 9 is a separation layer such as polyester; 10
indicates insulation Jl (PVC).

The heat-sensitive materials used in this type of heat-sensitive heating element include:
Materials that exhibit negative characteristics include Ny12 resin to which a halogenated compound such as K1 is added, or plasticized PVC containing a plasticizer to which surfactants and quaternary ammonium salts are added. It is an application of ion conduction characteristics, and it is also known that negative ions in particular contribute predominantly to the conduction characteristics.

Furthermore, in recent years, there has been a trend to make the surface of electric carpets more carpet-like, or to use carpet covers that look more authentic, or to use only floor heating for main heating. In the former case, since the surface material and cover material have high heat insulation properties, the temperature of the internal heating element must be higher than that of the conventional one to achieve a sufficient surface temperature. In the latter case, it is necessary to increase the heating area of the electric carpet's low-temperature radiant heating, that is, to increase the size of the electric carpet and increase the amount of heat generated. There is a tendency for local temperatures to rise to a greater extent than before, or in other words, the maximum temperature to be higher than before. In such a situation,
Since ion conduction occurs at high temperatures, electrical corrosion and oxidation of the copper-based material occur between negative ions and the copper-based material that is the heat-generating electrode, which is also known as the "recording phenomenon." The deterioration phenomenon of the thermosensitive resin material progresses at an accelerated pace, and the temperature-impedance characteristics become larger than the initial value, especially in high-temperature regions due to the decrease in negative ions and corrosion or oxidation substances generated between the electrode and the thermosensitive resin material. This has the disadvantage that temperature detection cannot be performed accurately.

For this reason, in the past, the practical range of heat-sensitive heating elements was limited, and they were limited to small products with low wattage or products that did not reach high temperatures, and due to the use of ionic conduction, which had poor ability to detect localized high temperature conditions. In addition, an electric carpent using a heat-sensitive wire and a heat-generating wire separately (so-called two-wire type) was put into practical use, using a stainless steel electrode as shown in Japanese Patent Publication No. 47-30651. has been done. In this kind of two-wire electric carpet,
Since the heat-sensitive wire is separated from the heat-generating wire, local temperature abnormalities in the heat-generating wire cannot be detected, resulting in poor safety. Also, 2
Since it is necessary to wire actual wires, there are drawbacks such as a large number of manufacturing steps.

(Objective of the Invention) The present invention was proposed in order to improve the above-mentioned drawbacks, and the thermistor characteristics (B constant) can be greatly improved.5. The thermistor characteristics do not change over time even when used under high-temperature conditions.The heating wire also serves as one temperature sensing electrode, making it extremely safe and requiring less manufacturing man-hours such as wiring. It is about providing.

(Disclosure of the Invention) In order to achieve the above object, the present invention provides a heat-sensitive heating element comprising a heating electrode and a temperature sensing electrode via a thermosensitive resin material, in which a copper-based metal material is used as the heating electrode and the temperature sensing electrode. , Ni material, Sn material, AI material.

It is characterized by having a surface layer made of either Cr material or Zn material.

Next, examples of the present invention will be described. Note that the embodiments are merely illustrative, and it goes without saying that various changes and improvements can be made without departing from the spirit of the present invention.

In Fig. 1 which shows an embodiment of the present invention, 5 is a center core, 6' is an inner heating electrode, 11 is a Ni plating layer, 7 is a heat-sensitive material, and 8' is an outer winding temperature sensor! 9 indicates a separation layer, and 10 indicates an insulating layer.

As shown in the figure, in the present invention, a heating electrode is used.

Since the temperature sensing electrode is made of a copper-based metal material plated with Ni, for example, the one using the SUS'i electrode shown in Japanese Patent Publication No. 47-30651 has a large resistance value and a low heating resistance value. In order to achieve this, a resistor with a large cross-sectional area must be used, which not only increases the cable's outer diameter and makes it impractical, but also results in poor bending performance and difficulty in bending when finished in an electric carpet. It does not have the drawbacks of conventional products, such as the uneven surface and uncomfortable seating.

Figure 2 shows a cable-type heat-sensitive heating element made of PVC resin with 50 parts of plasticizer added and 2 parts of quaternary ammonium salt with electrodes made of copper alloyed with 0.5% Sn.
Ni plating 1μ thick, Sn plating In thick, Zn on the rod
A surface AI electrode type (Fig. 4) with 1n thick coating, 1n thick Cr plating, and 2On thick AI foil on the heat-sensitive resin side of the copper electrode surface, and an electrode with exposed copper surface without plating. AC10 in an atmosphere of 120℃ for 5 types
This is a graph plotting over time the change in impedance measured by the voltage drop method when a cycle of 0V60Hz, 0NIO seconds, and 0FF60 seconds was applied. In addition, the fourth
The structure shown in the figure is made of copper-based electrodes 6' and 8' made of heat-sensitive resin material 7.
Ni and AI with a width equal to or greater than that of the electrode i6' and 8' on the side surface.
, Sn, Cr, and Zn foils 11' are wrapped around each other.

Further, FIG. 3 shows the same evaluation of the same sample as described above in an atmosphere of 100°C.

As can be seen from FIGS. 2 and 3, there is more Ni on the surface than when no treatment is applied to the surface of the copper 1i electrode.

It can be seen that when a protective layer is provided with Sn+Cr, Zn+^1, etc., the change in +21 over time becomes smaller and stability is increased. This phenomenon is mainly caused by negative ions such as Cl0a- and P0 when the thermosensitive resin material is a thermosensitive resin with negative characteristics due to ionic conduction, as in the embodiment of the present invention.
The cause is that ions such as 4'- react with Cu ions that become positively ionized due to the high temperature conditions and electric field and create compounds, which decreases the negative ions that are carriers of ion conduction and increases +21. However, oxides are generated on the copper surface at high temperatures and become an obstacle to ion conduction between the electrode and the thermosensitive resin material, and free MCI ~ ions are generated when the PVC thermosensitive resin material decomposes at high temperatures. As a result, the copper may corrode and generate obstructions as described above, resulting in unstable IZ1 characteristics and significant discoloration of the electrodes.

Although not shown in the figure, if the surface of the copper is not subjected to treatment such as plating, Ni, Sn, Cr, Zn in Figure 3.
.

In order to suppress changes in the degree of processing due to AI etc., 80%
It is necessary to keep the temperature below °C, which shows how great the effect of the present invention is.

In addition, both the first electrode and the second electrode are made of copper-based metal material with N.
When using a plated with i+ Sn+ Cr, Zn+ A1, etc., the resistance value can be determined as a heat generating resistance because the specific resistance is small, so the first and second electrodes can be used as heat generating electrodes and temperature sensing electrodes. , it is possible to switch and use them, and it is possible to obtain two types of power consumption with one heat-sensitive heating element.

In addition, in the present invention, even if the power consumption is not changed, Ni, Sn,
By applying a surface layer of Cr, Zn, AI, etc., and using Ni material, AI material, Sn material, Cr material, or Zn material as the temperature sensing electrode, the surface with poor bendability can be used as the temperature sensing electrode side. Therefore, safety can be further improved by improving folding performance and detecting disconnection of the temperature sensing electrode and operating a safety circuit.

(Effects of the Invention) As described above, according to the present invention, in a thermosensitive heating element comprising a heating electrode and a temperature sensing electrode via a thermosensitive resin material, a copper-based metal material is used as the heating electrode and the temperature sensing electrode.
Ni material, Sn material, AI material, Cr material.

By providing a surface layer made of one of the Zn materials, the ion-conductive thermosensitive resin material can be applied to a heat-sensitive heating element, and moreover, compared to the conventional two-wire temperature sensing wire that does not have a treated copper surface. Like the conventional two-wire system, even if voltage is applied between the electrodes under high temperature conditions, the IZ
The temperature characteristics of I are stable for a long time and do not deteriorate over time, and the heating wire also serves as one temperature detection electrode, so the heating temperature can be directly detected, making it an extremely stable electric power - easy for pets to use. This has the effect of being obtained.

The above explanation was about the cable type, but
Needless to say, the invention is not limited to this, and can also be applied to sheet heating elements.

[Brief explanation of the drawing]

FIG. 1 shows an example of the heat-sensitive heating element of the present invention, FIGS. 2 and 3 are diagrams illustrating changes in impedance in a 120°C atmosphere and a 100°C atmosphere, respectively, and FIG. 4 shows an example of the heat-sensitive heating element of the present invention. Embodiment 1, FIGS. 5 and 6 show conventional examples. 5... Central core, 6'... Heat generating electrode, 7... Heat sensitive material, 8'... Temperature sensing electrode, 9... Separation layer, 10...
・Insulating layer, 11...Ni plating Fig. 4 Fig. 5 jL, t) L, D

Claims (5)

[Claims] (1) A thermosensitive heating element comprising a heating electrode and a temperature sensing electrode via a thermosensitive resin material, characterized in that the heating electrode and the temperature sensing electrode are constructed by coating the surface of a copper-based metal material with a Ni material. A heat-sensitive heating element. (2) A thermosensitive heating element comprising a heating electrode and a temperature sensing electrode via a thermosensitive resin material, characterized in that the heating electrode and the temperature sensing electrode are constructed by coating the surface of a copper-based metal material with an Sn material. A heat-sensitive heating element. (3) A thermosensitive heating element comprising a heating electrode and a temperature sensing electrode via a thermosensitive resin material, characterized in that the heating electrode and the temperature sensing electrode are constructed by coating the surface of a copper-based metal material with an Al material. A heat-sensitive heating element. (4) A thermosensitive heating element comprising a heating electrode and a temperature sensing electrode via a thermosensitive resin material, characterized in that the heating electrode and the temperature sensing electrode are constructed by coating the surface of a copper-based metal material with a Cr material. A heat-sensitive heating element. (5) A thermosensitive heating element comprising a heating electrode and a temperature sensing electrode via a thermosensitive resin material, characterized in that the heating electrode and the temperature sensing electrode are constructed by coating the surface of a copper-based metal material with a Zn material. A heat-sensitive heating element.