JPH0584085U - Sheet heating element - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The voltage applied to the heating layer is half the AC voltage applied from the AC power supply, and power consumption is reduced while avoiding an increase in the electrical resistance of the heating layer. .. [Composition] A third electrode (14) connected to one terminal of an AC power supply is provided between the first and second electrodes (12, 13) provided for the heat generating layer (11). In addition, the first and second rectifiers (15, 16) are arranged between the first and second electrodes (12, 13) and the other terminal of the AC power source, respectively. Electrodes (12,14)
The half-wave rectified output obtained by rectifying the alternating current given by the alternating current power source by the first rectifier (15) between
Between the third electrodes (13, 14), another half-wave rectified output obtained by rectifying the AC current supplied from the AC power supply by the second rectifier (16) is applied. [Effect] The voltage applied to the heat generating layer can be half of the AC voltage applied from the AC power source, an increase in the electrical resistance value of the heat generating layer can be avoided, and power consumption can be reduced.

Description

[Detailed description of the device]

[0001]

[The purpose of the device]

[0002]

[Industrial applications]

 The present invention is a surface for heating an exothermic layer by connecting an alternating current power source to an electrode arranged in a heating layer formed of a thermoplastic polymer material mixed with a conductive substance and applying an alternating voltage. A heat generating element, in particular, a third electrode connected to one terminal of an AC power source is provided between the first and second electrodes provided for the heat generating layer. The first rectifier is arranged between the electrode and the other terminal of the AC power supply, and the second rectifier is arranged between the second electrode and the other terminal of the AC power supply. The half-wave rectified output of the AC current supplied from the AC power supply is applied between the third electrodes, and the other half-wave rectified output of the AC current supplied from the AC power supply is applied between the second and third electrodes. The present invention relates to a planar heating element that is applied.

[0003]

[Prior Art]

 Conventionally, this kind of planar heating element has been provided with a full-wave rectified output obtained by rectifying an AC current given from an AC power source over a full cycle to a pair of electrodes arranged in a heating layer. In addition, there has been proposed one in which the electric resistance of the heat generating layer is increased and the power consumption is reduced by ensuring a sufficient distance between the pair of electrodes arranged in the heat generating layer. .

[0004]

[Problems to be solved]

 However, in the conventional planar heating element, when a full-wave rectified output obtained by rectifying an alternating current over a full cycle is applied between a pair of electrodes, (i) the alternating current has a relatively high voltage such as that of a commercial power source. When supplied from an AC power source, the full-wave rectified output applied to the heating layer also becomes high voltage, increasing the number of switching operations (that is, the repeated operation of approaching and separating conductive materials) inside the heating layer. However, there is a drawback that (ii) the electric resistance value of the heat generating layer tends to increase with the lapse of use time.

In the conventional planar heating element, when the distance between the pair of electrodes is increased to increase the electric resistance of the heating layer and reduce the power consumption in the heating layer, (iii) the heating layer is made uniform. It is difficult to generate heat, and (iv) the electric resistance of the heat generating layer is locally increased, which makes it easy to rupture.As a result, (v) the heat generating layer is easily damaged locally. However, there is a drawback that heat generation becomes difficult in a short time and sufficient durability cannot be obtained.

Therefore, in order to eliminate these drawbacks, the present invention provides a third electrode connected to one terminal of an AC power supply between the first and second electrodes arranged in the heating layer. It is applied to the heating layer by arranging and applying different half-wave rectified outputs of different AC currents from the AC power source between the first and third electrodes and between the second and third electrodes, respectively. It is intended to provide a planar heating element whose voltage is half that of the AC voltage supplied from the AC power supply.

[0007]

[Device configuration]

[0008]

[Means for solving problems]

 The solution to the problem provided by the present invention is to apply an AC voltage by connecting an AC power source to an electrode arranged in a heating layer formed of a thermoplastic polymer material mixed with a conductive material. In the planar heating element that heats the heating layer by doing so, (a) is separated from the first electrode (12) disposed on the heating layer and (b) is separated from the first electrode (12). The second electrode (13) disposed on the heat generating layer and (c) the first electrode (12) and the second electrode (13) spaced apart from the heat generating layer. A third electrode (14) connected to one terminal of the AC power supply, and (d) is disposed between the first electrode (12) and the other terminal of the AC power supply. The first for applying the half-wave rectified output obtained by rectifying the AC current given by the device for only half cycle to the circuit including the first electrode (12), the third electrode (14) and the heating layer. Rectifier (15) and (e) It is arranged between the second electrode (13) and the other terminal of the AC power supply, and obtains the AC current given from the AC power supply by rectifying it for another half cycle. And a second rectifier (16) for applying a half-wave rectified output to a circuit including the second electrode (13), the third electrode (14) and the heat generating layer. Heating element ".

[0009]

[Action]

 The sheet heating element according to the present invention is formed by connecting an AC power source to an electrode provided in a heating layer formed of a thermoplastic polymer material mixed with a conductive substance and applying an AC voltage. A planar heating element that heats the heating layer, and is configured as disclosed in the section of [Solution to Problem] above, and is a first heating element disposed on the heating layer. A third electrode connected to one terminal of the AC power supply is provided between the two electrodes, and a first rectifier is provided between the first electrode and the other terminal of the AC power supply. A second rectifier is arranged between the second electrode and the other terminal of the AC power supply, and the AC current supplied from the AC power supply is rectified by the first rectifier between the first and third electrodes. The half-wave rectified output obtained in this way is applied, and the AC current supplied from the AC power supply is applied between the second and third electrodes to the second Since another half-wave rectified output obtained by rectifying with a rectifier is applied, (i) it has the effect of making the voltage applied to the heating layer half the AC voltage applied from the AC power supply, and (ii) ) It has the effect of reducing power consumption while avoiding an increase in the electrical resistance of the heat generating layer, and consequently (iii) has a function of uniformizing the heat generation of the heat generating layer and (iv) has a function of improving durability.

[0010]

【Example】

 Next, the planar heating element according to the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments thereof.

However, the embodiments described below are described to facilitate or facilitate understanding of the present invention, and not to limit the present invention.

In other words, each element disclosed in the embodiments described below includes all design changes and equivalent replacements within the spirit and scope of the present invention.

(Description of the accompanying drawings)

FIG. 1 is a block diagram showing a first embodiment of a planar heating element according to the present invention. In particular, electrodes 12 to 13 are arranged in parallel with a heating layer 11, respectively. It shows a case where it is formed by a strip-shaped electrode.

FIG. 2 is a block diagram showing a second embodiment of the sheet heating element according to the present invention. In particular, the comb-teeth-shaped portions are arranged so as to be close to each other with respect to the heating layer 21. In the case where the electrodes 22 and 23 are formed of a pair of comb-shaped electrodes and the electrode 24 is formed of a strip electrode arranged in a bent shape between the electrodes 22 and 23 with respect to the heating layer 21. Showing.

FIG. 3 is a block diagram showing a third embodiment of the sheet heating element according to the present invention. In particular, the electrodes 32 to 34 are spirally arranged with respect to the heating layer 31. The case where the electrodes are formed by strip electrodes is shown.

(Configuration of First Embodiment)

First, with reference to FIG. 1, the configuration of a first embodiment of the planar heating element according to the present invention will be described in detail.

Reference numeral 10 denotes a planar heating element according to the present invention, which is made of a thermoplastic polymer material mixed with a conductive material and has a PTC characteristic and a heating layer 11 having a PTC characteristic. An electrode 12 formed by a strip-shaped electrode arranged, an electrode 13 formed by a strip-shaped electrode arranged so as to be appropriately separated from the electrode 12 with respect to the heat generating layer 11, and an electrode for the heat generating layer 11. An electrode 14 which is formed between the electrode 12 and the electrode 13 so as to be located between the electrode 12 and the electrode 13 and which is appropriately separated from the electrode 13 and which is directly connected to one terminal of the AC power source E. And are equipped with. By the way, the PTC characteristic is a characteristic in which the temperature coefficient of electric resistance is positive (that is, the electric resistance value increases as the temperature rises and the electric resistance value decreases as the temperature falls). Further, the heat generating layer 11 is provided with a self-temperature control function for keeping the heat generating temperature within a desired temperature range. In other words, the PTC characteristic is that the thermoplastic polymer material expands as the temperature rises, separating the conductive material mixed in the thermoplastic polymer material and increasing the electrical resistance value to cut off the current. In addition, as the temperature decreases, the thermoplastic polymer material contracts, causing the conductive substance mixed in the thermoplastic polymer material to approach, reducing the electrical resistance value, and passing an electric current. is doing.

The heating layer 11 is made of conductive carbon particles (carbon black or graphite) with respect to a polymer material (eg, ethylene vinyl acetate copolymer, ethylene acrylate copolymer, polyolefin, ethylene propylene diene terpolymer or a mixture thereof). ) Alternatively, a conductive elastomer obtained by mixing metal particles (for example, nickel particles) as a conductive substance in an appropriate ratio by kneading, etc., is molded under pressure in a heated state, or a suitable solvent (for example, xylene) is added. It is formed by dissolving or dispersing it into a conductive polymer material liquid, and then coating it on a resin film functioning as an insulating film with an appropriate thickness (for example, 50 to 300 μm). The heat generating layer 11 preferably has sufficient flexibility in consideration of the usage state. A cloth base material (not shown) formed of a woven cloth or a non-woven cloth may be provided for the heating layer 11 for reinforcement. By the way, the conductive carbon particles are preferably (i) a low structure rather than a high structure because it can suppress a change in electric resistance value when the planar heating element 10 is bent or stretched, and (ii) It is preferred that the particle size is relatively large.

The electrodes 12, 13 and 14 are formed by, for example, bonding an electrode forming metal foil (for example, a copper foil or a nickel foil having a thickness of about 15 to 50 μm) to the heat generating layer 11 and then etching the foil. Is formed on the heat generating layer 11 by applying a conductive polymer material (for example, a conductive paint) to the heat generating layer 11.

The sheet heating element 10 according to the present invention is also arranged between the electrode 12 and the other terminal of the AC power source E and allows the AC current supplied from the AC power source E to pass through only half a cycle. It is arranged between the rectifier 15 for rectifying and half-wave rectified output, and the electrode 13 and the other terminal of the AC power source E, so that the AC current supplied from the AC power source E can be supplied only to the other half cycle. And a rectifier 16 for passing and rectifying to obtain another half-wave rectified output. The rectifiers 15 and 16 are formed by appropriate rectifiers (for example, silicon diodes).

(Operation of First Embodiment)

Further, with reference to FIG. 1, the operation of the first embodiment of the planar heating element according to the present invention will be described in detail.

The AC current supplied from the AC power supply E is applied to a circuit including the rectifier 15, the electrode 12, the heat generating layer 11 and the electrode 14 in a certain half cycle, and the electrode 14, the heat generating layer 11 and the electrode in the next half cycle. Provided to the circuit including 13 and rectifier 16.

In other words, the half-wave rectified outputs having different alternating currents supplied from the AC power source E are alternately applied to the electrodes 12 and 14 and the electrodes 13 and 14, and are applied to the heat generating layer 11. The magnitude of the voltage is given from the AC power source E and is half the magnitude of the AC voltage.

Therefore, according to the present invention, an increase in the voltage applied to the heat generating layer 11 via the electrodes 12 and 14 and the electrodes 13 and 14 can be suppressed, so that an increase in the electric resistance value of the heat generating layer 11 can be avoided. The power consumption can be reduced continuously, and as a result, the heat generation of the heat generating layer can be made uniform and the durability can be improved.

(Structure of Second Embodiment)

Further, with reference to FIG. 2, the configuration and operation of the second embodiment of the planar heating element according to the present invention will be described in detail.

In the second embodiment, the electrodes 22 and 23 are formed of a pair of comb-teeth-shaped electrodes arranged so that the comb-teeth-shaped portions are close to each other with respect to the heat-generation layer 21, and the electrode 24 is the heat-generation layer. It has substantially the same configuration as that of the first embodiment except that it is formed of a strip-shaped electrode arranged in a bent shape between the electrodes 22 and 23 with respect to 21.

Therefore, in the second embodiment, the electrodes 22 to 24 cover the heat generating layer 21 relatively sufficiently to assist the heat dissipation thereof, and the distance between the electrodes 22 to 24 is made relatively close. Except for this, the operation is substantially the same as that of the first embodiment.

Therefore, according to the present invention, since the distance between the electrodes 22 to 24 can be relatively close to each other, it is possible to suppress an increase in the electric resistance value of the heat generating layer 21 with time and to dissipate the heat of the heat generating layer 21. It has substantially the same effect as that of the first embodiment except that it can support.

Here, for the sake of simplification of description, the members corresponding to the members included in the first embodiment are larger by “10” than the reference numerals given in the first embodiment. By giving reference numbers, other detailed explanations are omitted.

(Configuration of Third Embodiment)

Further, referring to FIG. 3, the configuration and operation of the third embodiment of the sheet heating element according to the present invention will be described in detail.

The third embodiment is substantially the same as the first and second embodiments except that the electrodes 32 to 34 are formed by band-shaped electrodes arranged spirally with respect to the heat generating layer 31. Have the same configuration.

Therefore, in the third embodiment, the electrodes 32 to 34 cover the heat generating layer 31 more sufficiently to support its heat dissipation, and the distance between the electrodes 32 to 34 is made closer. Except for this, the operation is substantially the same as that of the first and second embodiments.

Therefore, according to the present invention, since the distance between the electrodes 32 to 34 can be further reduced, it is possible to further suppress the increase in the electric resistance value of the heat generating layer 31 with time and to further reduce the heat radiation of the heat generating layer 31. It has substantially the same effects as those of the first and second embodiments except that they can be supported.

Here, for the sake of simplicity of description, the members corresponding to the members included in the first and second embodiments are given more reference numerals than the reference numerals given in the first and second embodiments. Other detailed explanations are omitted by giving reference numbers which are respectively increased by “20” and “10”.

[0040]

[Effect of the device]

 As is apparent from the above, the planar heating element according to the present invention is one in which an AC power source is connected to the electrodes arranged in the heating layer formed of the thermoplastic polymer material mixed with the conductive material. A planar heat-generating body that heats a heat-generating layer by applying an AC voltage, and is configured as disclosed in the section of [Solution to Problem] and is arranged on the heat-generating layer. A third electrode connected to one terminal of the AC power supply is disposed between the first and second electrodes, and a first rectifier is provided between the first electrode and the other terminal of the AC power supply. And a second rectifier is provided between the second electrode and the other terminal of the AC power supply, and an AC current supplied from the AC power supply is applied between the first and third electrodes. The half-wave rectified output obtained by rectifying with the first rectifier is applied and applied from the AC power supply between the second and third electrodes. Since another half-wave rectified output obtained by rectifying the alternating current with the second rectifier is applied, (i) the voltage applied to the heating layer can be half of the alternating voltage supplied from the alternating current power supply. In addition, it has the effect of (ii) the effect of avoiding an increase in the electric resistance value of the heat generating layer and reducing the power consumption, and consequently (iii) the effect of uniformizing the heat generation of the heat generating layer, and (iv) Has the effect of improving durability.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a planar heating element according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the sheet heating element according to the present invention.

FIG. 3 is a structural view showing a third embodiment of the sheet heating element according to the present invention.

[Explanation of symbols] 10・ ・ ・ ・ ・ ・ ・ ・ Sheet heating element 11 ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ Heating layer 12〜14 ・ ・ ・ ・ Electrodes 15,16 ・ ・ ・ ・ ・・ ・ ・ Rectifier 20・ ・ ・ ・ ・ ・ ・ ・ Sheet heating element 21 ・ ・ ・ ・ ・・ ・ ・ ・ Heating layer 22〜24 ・ ・ ・ ・ Electrodes 25, 26 ・ ・..Rectifier 30 ... Heating layer 32-34 ... Electrodes 35, 36 ...・ Rectifier E ・ ・ ・ ・ ・....... AC power supply

Claims (1)

[Scope of utility model registration request] 1. A heating layer is heated by connecting an AC power supply to an electrode arranged on a heating layer formed of a thermoplastic polymer material mixed with a conductive substance and applying an AC voltage thereto. In the planar heating element consisting of: (a) the first electrode (12) provided on the heating layer, and (b) the first electrode (12) provided apart from the first electrode (12) on the heating layer. The second electrode (13) and (c) are provided for the heating layer apart from the first electrode (12) and the second electrode (13) and are connected to one terminal of the AC power supply. The third electrode (14), (d) is arranged between the first electrode (12) and the other terminal of the AC power supply, and rectifies the AC current supplied from the AC power supply for half a cycle. The half-wave rectified output obtained from the first electrode (12)
A first rectifier (15) for supplying to a circuit including a third electrode (14) and a heating layer, and (e) a second rectifier (13) between the second electrode (13) and the other terminal of the AC power supply. The second electrode is provided with a half-wave rectified output obtained by rectifying the AC current given from the AC power source for another half cycle.
A planar heating element comprising: a second rectifier (16) for supplying a circuit including (13), a third electrode (14) and a heating layer.