JPS63231894A - Divided heat-sensitive 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 (Technical Field) The present invention relates to a multi-segment heat-sensitive sheet heating element applied to a wide area heating appliance such as an electric carpet.

(Background technology) Heating devices such as electric carpets provide a feeling of heating through low-temperature radiation and contact heat transfer to the person sitting on the seat, and require a large surface area. It is becoming more common to use heating structures by changing the heating structure depending on the number of people, and in the case of a small number of people, a small area is used. The reason behind this is that in addition to energy saving, electric carpets are often used in conjunction with other heaters, such as kerosene heaters, and are used without much concern for the feeling of radiant heating or the ability to raise room temperature as a main heating device. This is probably because there are many people.

Therefore, the functions required of heating equipment such as electric carpets range from heating that emphasizes contact heat transfer, which can heat only the area where the person is sitting, when used by one person, to heating that emphasizes contact heat transfer, and heating that can raise the room temperature. This function allows you to freely choose the heating method, including heating a large area when used by a large number of people.

(Objective of the Invention) The present invention has been proposed in view of the above points, and its purpose is to allow the heat generating area to be freely selected, and to simplify the structure, thereby simplifying wiring work and temperature control circuits. It is an object of the present invention to provide a multi-segmented heat-sensitive sheet heating element which can be used in a heat-generating body, and which can prevent temperature control operations between the divided heating elements from affecting each other.

(Disclosure of invention) Hereinafter, the present invention will be described in detail with reference to the drawings showing examples.

FIG. 1 is a perspective view of an electric carpet to which the multi-segment heat-sensitive sheet heating element of the present invention is applied. In the figure, ■ is the electric carpet body, ◎ is the temperature control circuit, ○ is the power cord,
A-1 to A-3 are individual heating elements (heater elements) divided into three, SS, ~SS are individual heating elements A~ divided into three
This is a heating area selection switch that turns on/off energization to A-1 to A-3.

It goes without saying that the number of divisions of the heating element is not limited to three.

FIG. 2 shows a temperature control circuit for the electric carpet shown in FIG. Note that details will be described later.

FIG. 3 shows a partial cross-sectional view of an embodiment of the multi-segment heat-sensitive sheet heating element A of the present invention, in which a heat-generating electrode 2 made of metal foil is provided on one surface of a negative-characteristic heat-sensitive resin material 1. A temperature sensing electrode 3 similarly made of metal foil is provided on the other surface, and an insulating film 4 is pasted on both surfaces. Further, FIG. 4 shows a cord-type heat-sensitive heating element A' according to another embodiment, which is arranged in a planar manner to form a planar heating element. As for the structure, a temperature sensing electrode 3' is wound around a central core 6', a heat generating electrode 2' is wound around it through a negative characteristic thermosensitive resin material 1', and a separation layer 5' and an insulating layer 4 are wound around it. ′
It should be covered with.

Returning to FIG. 2, we will explain the configuration of the temperature control circuit. Heating electrodes 2-1 to 2-3 (heating elements A-1 to A- in FIG. The heating electrodes i) in 3 are connected in parallel, and these heating electrodes 2-1 arranged in parallel
2-3 are provided with temperature sensing electrodes 3 arranged in series so as to face each other with the negative characteristic thermosensitive resin material 1 interposed therebetween. Further, one end of the temperature detection electrode 3 is connected to a heating electric current ai2-1 to ai2-2-.
3, a current converter C is installed at one end of the commercial power supply AC, that is, on the side opposite to the relay contacts S and -S3 so that the leakage current flowing through the negative characteristic thermosensitive resin material 1 can be detected.
Connected by interlinking T.

On the other hand, the other end of the temperature detection electrode 3 is connected to a circuit that performs temperature control by detecting the sensor voltage vTo generated by the leakage current and the resistance of the temperature detection electrode 3, and the output of the current converter CT increases as the temperature rises. An increase in the leakage current flowing through the rising negative characteristic thermosensitive resin material 1 is detected and the temperature #a is set.
It is connected to a circuit that operates as LT. That is, the sensor voltage V generated at the temperature detection electrode 3. 0 is passed through the sensor voltage detection circuit 11 and the heating area detection setting correction circuit 12 to reach the switching time of $15. Area selection switch SS, ~SS3
including. )13 are connected. Also, current converter C
The output of T is sent to a switching circuit 1 which performs temperature control by comparing the magnitude of the temperature signal with a reference voltage via a smoothing circuit 14.
5 and is sequentially transmitted to and processed by a relay drive circuit 16 that turns on and off relay contacts 81 to S3. Further, when the temperature of the heat generating electrodes 2-1 to 2-3 decreases after the relay contacts 81 to S3 turn off, an off time timer #117 is set in the relay drive circuit 16 to turn on the relay to generate heat again. It is connected. Note that the power supply circuit 18 is for supplying DC power to each part.

Therefore, the operation of the temperature control circuit described above is as follows. That is, when the concentration of the heat generating electrodes 2-1 to 2-3 increases, the impedance of the negative characteristic thermosensitive resin material 1 decreases, and the sensor voltage vT. and the output of the current converter CT increases,
When the temperature signal input from the current converter CT to the switching circuit 15 via the smoothing circuit 14 increases and reaches the set temperature, the output of the switching circuit 5 is reversed, and the output of the switching circuit 5 is reversed, and the signal is input to the switching circuit 15 via the relay drive circuit 16 to the relay contacts S, - S3 is turned off, the temperature rise stops, and a cooling state is entered. In addition, relay contact S
,~When S3 is turned off, no temperature signal can be obtained, but
The off-time timer circuit 17 maintains the off state for a predetermined period of time, and after the elapse of that time, electricity is started again. Through these operations, the multi-segment heat-sensitive sheet heating element A is controlled to a predetermined concentration.

On the other hand, if one of the heating electrodes 2-1 to 2-3 is partially strongly insulated and the temperature rises in case B, a large control current (leakage current L
) flows into the temperature detection electrode 3, and the temperature detection electrode 3 faces the heat generation electrodes 2-1 to 2-3 in series, so the sensor voltage v7o does not indicate which part of the heat generation electrodes is at a high temperature. A voltage is generated that indicates whether the This sensor voltage V engineering.

The sensor voltage detection circuit 11 detects, the heating area detection setting correction circuit 12 operates, and the switching circuit 15. The relay drive circuit 16 turns off the relay contacts corresponding to the heating electrodes that are partially heated. At this time, the heat generating area detection setting correction circuit 12 also changes the reference voltage within the switching circuit 15, and performs a correction operation to compensate for the decrease in the output of the current converter CT due to the occurrence of a non-heat generating portion. By doing so, humidity control for the temperature rise of the remaining heat generating parts where high temperatures are not partially generated can be stably performed by the magnitude of the output of the current converter CT, regardless of the heat generating area.

Furthermore, if the heat generating area is artificially reduced by the heat generating area selection circuit 13, the sensor voltage V□
. In other words, the sensor voltage detection circuit #11 is activated, and the temperature faJ# operation is corrected as described above, so that stable temperature control operation can be performed regardless of the heat generating area. .

Furthermore, since the relay contacts S and ~S3 are provided on the opposite pole side from the connection side of the temperature detection electrode 3 and the heat generating circuit (they may be cut on both sides), no heat is generated (when the relay contacts are turned off). Since there is no leakage current when the product is turned off from the beginning of use, the humidity in non-heat generating parts will not affect the temperature control operation of other heat generating parts due to room temperature, and
Even if the heating circuit is turned off only in the heat-insulating part due to partial insulation, the high temperature state of that part will not affect the temperature control operation of other heat-generating parts, and the temperature control operation as a whole can be stable. It is.

In the above embodiment, there are three heat generating electrodes and one temperature sensing electrode, but there is no particular restriction. Also, although we have explained the case where the magnitude of J leak current is detected by current conversion @CT, there is no problem in using other methods.
It is not limited to this. Similarly, the temperature #kashi@road has been explained using a block diagram, but the explanation is not limited to the explained content.

(Effects of the Invention) As described above, the present invention has two or more heating elements each including a heating electrode and a temperature sensing electrode via a thermosensitive resin material, and turns on each heating element.・In the heat-sensitive sheet heating element, which is equipped with an off switch and whose heat-generating area can be divided into multiple parts, temperature-sensing electrodes facing multiple heat-generating electrodes arranged in parallel are arranged in series, so (a) division is possible. Electricity can be selectively applied to the heated heating elements, and the heating area can be freely selected.

(b) Although the heating electrode is divided into a plurality of parts, the number of temperature sensing electrodes is smaller than the number of divisions of the heating electrode, so wiring work is simple and the temperature control circuit is also simplified.

(c) Since the state of the non-heat generating part can be prevented from affecting other heat generating parts, stable temperature control operation can be performed.

There are other effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an electric carpet to which the multi-segment heat-sensitive sheet heating element of the present invention is applied, and FIG. 2 is a configuration example of a temperature control circuit.
FIG. 3 and FIG. 4 are examples of the configuration of the heating element. ■・・・Electric carpet body, @・・・Temperature control circuit section, O...Power cord section, A...
...Multi-segmented thermosensitive sheet heating element, A-1 to A-3...
... Heating element, 1 ... Negative characteristic thermosensitive resin material, 2.2
-1 to 2-3...Heating electrode, 3...Temperature detection electrode, SS1 to SS3...Heating area selection switch -11-' Figure 2

Claims (2)

[Claims] (1) It has two or more heating elements that are equipped with a heating electrode and a temperature sensing electrode via a thermosensitive resin material, and is equipped with a switch to turn on and off the electricity of each heating element, so that the heating area can be divided into multiple parts. 1. A multi-divided heat-sensitive sheet heating element characterized in that a plurality of heat-sensing electrodes facing a plurality of heating electrodes arranged in parallel are arranged in series. (2) The magnitude of the leakage current relative to the temperature rise value that flows from each heating electrode to the common temperature sensing electrode via the thermosensitive resin material by connecting the temperature sensing electrode arranged in series and one end of the heating electrode. The multi-segmented heat-sensitive surface shape according to claim 1, wherein the contact point of the switch for switching the heat-generating area is provided at least on the side opposite to the connection side of the heat-generating electrode and the temperature-detecting electrode. heating element.