JP2018107116A - Heating unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating unit capable of achieving high installation workability.SOLUTION: The heating unit includes: a heating sheet 1 heated by an energizing current; a plurality of band electrodes 2a-2e arranged on the heating sheet 1, being spaced from each other and supplying electric power to the heating sheet 1. The band electrodes 2a-2e include a plurality of opposing positions K1-K4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heating element.

  Patent Document 1 below discloses a carbon fiber-dispersed film in which carbon fibers are dispersed in a coating substrate. This carbon fiber-dispersed film is obtained by spreading a carbon fiber dispersion liquid in which fine carbon fibers such as carbon nanostructures represented by carbon nanotubes are dispersed in a dispersant or solvent on a substrate. A fiber skeleton tissue layer in which carbon fibers are dispersed and arranged by drying or gelling the development layer is provided, and a fluid containing a film-forming component is overcoated on the fiber skeleton tissue layer. Such a carbon fiber-dispersed film can be applied to heat generating materials, conductive wires, and the like.

JP 2008-273806 A

  By the way, when an electrode is attached to both ends of the heat generating material such as the carbon fiber dispersed film described above to form a heat generating body, the electric resistance of the heat generating material is the distance between the pair of electrodes (distance between the electrodes), that is, the size of the heat generating material. It depends. In other words, since the energization current of the heat generating material is determined by the electric resistance based on the size of the heat generating material when the power supply voltage is constant, the heat generation amount (surface temperature) of the heat generating material decreases as the size of the heat generating material increases. Thus, the size of the heating material increases as the size of the heating material decreases.

  Therefore, in such a heating element, since the size of the heating material (heating element) depends on the surface temperature of the heating material (heating element), for example, it is applied to a purpose of heating or keeping a relatively wide area to a desired temperature. When trying to do so, it is necessary to spread a plurality of heating elements in the region. And in such a use, since it is necessary to spread a several heat generating body, there exists a problem that laying workability | operativity is bad.

  This invention is made | formed in view of the situation mentioned above, and aims at providing the heat generating body which can improve laying workability | operativity.

  In order to achieve the above object, in the present invention, as a first solving means related to a heating element, a heating sheet that generates heat by an energizing current, and a plurality of electrodes that are spaced apart from the heating sheet and that feed power to the heating sheet, The plurality of electrodes are provided with a plurality of opposing locations.

  In the present invention, as the second solving means relating to the heating element, in the first solving means, the heating sheet includes a heating layer that generates heat by the energizing current on both sides or one side of the sheet-like base material. Is adopted.

  In the present invention, as a third solving means relating to the heating element, in the second solving means, a means is adopted in which the heating layer is a carbon fiber dispersed film in which carbon fibers are dispersed in a substrate.

  In the present invention, as a fourth solving means relating to the heating element, a means is used in the third solving means that the substrate is a paint.

  In the present invention, as a fifth solving means related to the heating element, in any one of the first to fourth solving means, the plurality of electrodes include three or more strip-like electrodes each having a portion extending at an equal distance. The method of being is adopted.

  In the present invention, as the sixth solving means relating to the heating element, in the fifth solving means, a means is adopted in which the plurality of electrodes extend linearly.

  In the present invention, as a seventh solving means relating to the heating element, in any one of the first to fourth solving means, the plurality of electrodes include a pair of combs each having a plurality of portions extending at equal distances from each other. A means of being a blade electrode is employed.

  In the present invention, as the eighth solving means relating to the heating element, in any one of the first to seventh solving means, the carbon fiber bearing conductivity between the heating sheet and the electrode bears adhesiveness. A means is adopted in which a conductive paint dispersed in the paint is present.

  According to the present invention, since the plurality of electrodes are formed so as to have a plurality of opposing locations, it is possible to improve the laying workability of the heating element.

It is a front view of the heat generating body concerning a 1st embodiment of the present invention. FIG. 2 is an arrow view taken along line XX in FIG. 1. It is a schematic diagram for demonstrating the effect | action of the heat generating body which concerns on one Embodiment of this invention. It is a front view of the heat generating body which concerns on 2nd Embodiment of this invention. It is principal part sectional drawing of the heat generating body which concerns on 1st Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
First, a first embodiment of the present invention will be described. The heating element A according to the first embodiment includes a heating sheet 1 and five strip electrodes 2a to 2e as shown in FIG.

  The heat generating sheet 1 is a rectangular sheet-like member that generates heat due to the energization current I, and a pair of sides S1 and S2 parallel to each other and a pair of sides S3 and S4 orthogonal to the pair of sides S1 and S2 and parallel to each other. Moreover, the sheet-like base material 1a and the heat generating layer 1b are provided. The sheet-like substrate 1a is formed from a material having flexibility and heat resistance, and is a rectangular member that bears the mechanical characteristics of the heat generating sheet 1. The sheet-like base material 1a is made of, for example, paper or heat resistant resin.

  The heat generating layer 1 b is a rectangular layer that is provided on one side of the sheet-like substrate 1 a and bears the heat generation characteristics of the heat generating sheet 1. The heat generating layer 1b has a characteristic of generating heat by the energizing current I, and is a carbon fiber dispersion film in which, for example, carbon fibers are dispersed in a substrate. The carbon fiber is a fine conductive fiber made of a carbon nanostructure represented by a carbon nanotube. The substrate is a predetermined dispersant or solvent, for example, a paint. In such a heat generating sheet 1 (heat generating layer 1b), the carbon fibers are uniformly dispersed in the entire rectangular region, and thus has a uniform electric resistance in the entire region.

  In addition, the heat generating sheet 1 in the first embodiment includes a heat generating layer 1b on one surface of a sheet-like substrate 1a as shown in FIG. However, the heat generating layer 1b may be provided on both surfaces of the sheet-like substrate 1a as necessary. That is, in order to provide heat generation performance to both surfaces of the heat generating sheet 1, the heat generating layers 1b are provided on both surfaces of the sheet-like substrate 1a.

  As shown in FIG. 1, the five strip electrodes 2 a to 2 e are strip electrodes extending linearly at equal distances, and are arranged on the upper surface of the heat generating sheet 1 so as to be in contact with the heat generating layer 1 b of the heat generating sheet 1. Has been. These five strip-shaped electrodes 2a to 2e are spaced apart from each other on the upper surface of the heat generating sheet 1 in a posture parallel to each other and at an equal interval, and receive power supplied from an external power source D (DC power source). Power is supplied to the heat generating sheet 1 (more precisely, the heat generating layer 1b).

  That is, among the five strip electrodes 2a to 2e, the first strip electrode 2a is disposed so as to be parallel and close to the side S1 of the heat generating sheet 1. The second strip electrode 2b is arranged in parallel to the first strip electrode 2a and spaced apart from the first strip electrode 2a in a state of directly facing the first strip electrode 2a. The third strip electrode 2c is arranged in parallel with the second strip electrode 2b at a predetermined distance in a state of directly facing the second strip electrode 2b.

  The 4th strip | belt-shaped electrode 2d is arrange | positioned in parallel with the said 3rd strip | belt-shaped electrode 2c and the predetermined distance in the state which faced the said 3rd strip | belt-shaped electrode 2c directly. The fifth strip electrode 2e is disposed so as to be parallel and close to the side S2 of the heat generating sheet 1 to which the first strip electrode 2a is adjacent.

  As shown in FIG. 1, the five strip electrodes 2a to 2e are provided with four facing portions K1 to K4. Among these four opposing locations K1 to K4, the first opposing location K1 is a rectangular region between the first strip electrode 2a and the second strip electrode 2a on the heat generating sheet 1. The second facing portion K2 is a rectangular region between the second strip electrode 2b and the third strip electrode 2c on the heat generating sheet 1. The third facing portion K3 is a rectangular region between the third strip electrode 2c and the fourth strip electrode 2d on the heat generating sheet 1. The fourth facing portion K4 is a rectangular region between the fourth strip electrode 2d and the fifth strip electrode 2e on the heat generating sheet 1.

  The widths of the four facing portions K1 to K4, that is, the inter-electrode distances L of the strip electrodes 2a to 2e adjacent on the heat generating sheet 1 are all the same. In addition, the width | variety of each strip | belt-shaped electrode 2a-2e is suitably set according to the magnitude | size (current capacity | capacitance) of the energization current I which energizes the heat generating sheet 1.

  Of the five strip electrodes 2a to 2e, the first strip electrode 2a is connected to the plus terminal of the power source D by the first connecting wire 3a. The second strip electrode 2b is connected to the GND terminal of the power source D by the second connecting wire 3b. The 3rd strip | belt-shaped electrode 2c is connected to the plus terminal of the power supply D by the 3rd connection electric wire 3c. The 4th strip | belt-shaped electrode 2d is connected to the GND terminal of the power supply D by the 4th connection electric wire 3d. The fifth strip electrode 2e is connected to the plus terminal of the power source D by the fifth connecting wire 3e.

  That is, among the five strip electrodes 2a to 2e, the first strip electrode 2a, the third strip electrode 2c, and the fifth strip electrode 2e are connected to the positive terminal of the external power source D, and the remaining second electrodes The strip electrode 2b and the fourth strip electrode 2d are connected to the GND terminal (ground terminal) of the power source D. That is, the voltage + Vc is supplied from the power source D to the first strip electrode 2a, the third strip electrode 2c, and the fifth strip electrode 2e, and the second strip electrode 2b and the fourth strip electrode 2d are the power source D. Is grounded.

  Next, the function and effect of the heating element A configured as described above will be described in detail with reference to FIG.

  In this heating element A, as shown in FIG. 3, the heating sheet 1 (heating layer 1b) has a uniform electrical resistance, and the inter-electrode distances L of the five strip electrodes 2a to 2e are all equal. The electrical resistances R1 to R4 at the opposed locations K1 to K4 are substantially equal. Therefore, when electric power is supplied from the power supply D, the energization currents I1 to I4 flowing through the four opposing locations K1 to K4 are substantially equal, and as a result, the four opposing locations K1 to K4 have a predetermined temperature (surface temperature). It generates heat almost uniformly.

  Here, when the heat generating sheet 1 is caused to generate heat by two adjacent strip electrodes, for example, when the heat generating sheet 1 is energized only by the first strip electrode 2a and the second strip electrode 2b, the facing portion K1 Only heat will be generated. That is, when the surface temperature of the heat generating sheet 1 is set to a desired temperature by the first belt-like electrode 2a and the second belt-like electrode 2b, the heat generation region is larger than when the five belt-like electrodes 2a to 2e are used. Narrow.

  If the second to fourth strip electrodes 2b to 2d are deleted and the fifth strip electrode 2e is connected to GND, the heat generating sheet is formed only by the first strip electrode 2a and the fifth strip electrode 2e. 1 to generate heat, the inter-terminal distance between the first strip electrode 2a and the fifth strip electrode 2e is slightly more than four times the inter-terminal distance L described above. The resistance is slightly more than four times the electric resistances R1 to R4 described above. Therefore, since the energization current in this case becomes 1/4 or less than the above-described energization currents I1 to I4, the surface temperature of the heating element A is lowered to 1/4 or less.

  That is, according to the heating element A according to the first embodiment, the five strip electrodes 2a to 2e extending at the inter-electrode distance L (equal distance) are provided so as to form the four facing portions K1 to K4. The entire area of the heat generating sheet 1 can be uniformly heated. Here, when a region having the same size as the heat generating sheet 1 is to be heated with a pair of band electrodes such as the first band electrode 2a and the second band electrode 2b, the heating element having a shape in which the heating element A is divided into four parts. It is necessary to lay 4 sheets. Therefore, according to the heating element A according to the first embodiment, the laying workability of the heating element A can be improved.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 4, the same components as those shown in FIG. In the following description, the description of the components having the same reference numerals is omitted.

  A heating element B according to the second embodiment includes a heating sheet 1 and two comb-shaped electrodes 2f and 2g as shown in FIG. As shown in FIG. 4, the pair of comb-shaped electrodes 2 f and 2 g are comb-shaped electrodes, and are arranged on the upper surface of the heat generating sheet 1 so as to be in contact with the heat generating layer 1 b of the heat generating sheet 1. The pair of comb blade-like electrodes 2f and 2g have the same shape, but are spaced apart from each other on the upper surface of the heat generating sheet 1 in a reverse orientation. The pair of comb-shaped electrodes 2f and 2g, like the above-described five strip electrodes 2a to 2e, generate electric power supplied from an external power source D (DC power source) as the heat generating sheet 1 (more accurately, generate heat). Power is supplied to layer 1b).

  Furthermore, of the pair of comb blade electrodes 2f and 2g, one comb blade electrode 2f includes three comb blade portions 2f1 to 2f3 and a connecting portion 2f4. The three comb blade portions 2f1 to 2f3 are portions that are linearly arranged in parallel at a predetermined distance. Of these three comb blade portions 2f1 to 2f3, the first comb blade portion 2f1 is provided so as to be parallel and close to the side S1 of the rectangular heat generating sheet 1.

  The second comb blade portion 2f2 is provided in parallel to the first comb blade portion 2f1 at a predetermined distance. The third comb blade portion 2f3 is provided in parallel to the second comb blade portion 2f2 at a predetermined distance. The connecting portion 2f4 is provided so as to be parallel and close to one side orthogonal to one side of the heat generating sheet 1 to which the first comb blade portion 2f1 is close, and the sides of the three comb blade portions 2f1 to 2f3 It is a linear part which connects S3 side one ends.

  On the other hand, the other comb blade electrode 2g includes three comb blade portions 2g1 to 2g3 and a connecting portion 2g4. The three comb blade portions 2g1 to 2g3 are portions arranged in parallel in a straight line at a predetermined distance. Of these three comb blade portions 2g1 to 2g3, the first comb blade portion 2g1 is provided so as to be parallel and close to the side S2 of the heat generating sheet 1.

  The second comb blade portion 2g2 is provided in parallel to the first comb blade portion 2g1 at a predetermined distance. The third comb blade portion 2g3 is provided in parallel to the second comb blade portion 2g2 with a predetermined distance. The connecting portion 2g4 is a linear portion that is provided so as to be parallel and close to the side S4 of the heat generating sheet 1 and that connects the ends of the three comb blade portions 2g1 to 2g3 on the side S4 side. The three comb blade portions 2f1 to 2f3 and 2g1 to 2g3 in the pair of comb blade electrodes 2f and 2g are portions extending linearly at equal distances from each other.

  Five opposing portions K5 to K9 shown in the figure are formed on the heat generating sheet 1 by the three comb blade portions 2f1 to 2f3 and 2g1 to 2g3 in the pair of comb blade electrodes 2f and 2g. That is, the first facing portion K5 is a region between the first comb blade portion 2f1 and the third comb blade portion 2g3. The second facing portion K6 is a region between the third comb blade portion 2g3 and the second comb blade portion 2f2. The third facing portion K7 is a region between the second comb blade portion 2f2 and the second comb blade portion 2g2. The fourth facing portion K8 is a region between the second comb blade portion 2g2 and the third comb blade portion 2f3. The fifth facing portion K9 is a region between the third comb blade portion 2f3 and the first comb blade portion 2g1.

  The widths of the five facing portions K5 to K9, that is, the inter-electrode distances La in the facing direction of the pair of sides S and S2 in the heat generating sheet 1 are all the same. Note that the widths of the pair of comb-shaped electrodes 2f and 2g are appropriately set according to the magnitude (current capacity) of the energization current I energizing the heat generating sheet 1.

  Of such a pair of comb-shaped electrodes 2f, 2g, one comb-shaped electrode 2f is connected to the plus terminal of the power source D by the first connecting wire 3f. The other comb-shaped electrode 2g is connected to the GND terminal of the power source D by the second connecting wire 3g.

  In the heat generating body B configured in this way, the heat generating sheet 1 (heat generating layer 1b) has a uniform electric resistance and the inter-electrode distances La of the pair of comb blade electrodes 2f and 2g are all equal. The electrical resistances at the opposed locations K5 to K9 are substantially equal. Therefore, when electric power is supplied from the power source D, the energization currents flowing through the five opposing locations K5 to K9 become substantially equal. As a result, the five opposing locations K5 to K9 are substantially uniform at a predetermined temperature (surface temperature). Fever.

  According to the second embodiment, since the pair of comb-shaped electrodes 2f and 2g extending at the interelectrode distance La (equal distance) are provided so as to form the five facing portions K5 to K9, the heat generating sheet is provided. It is possible to generate heat uniformly over the entire area of 1. Here, a pair of comb blade portions such as the first comb blade portion 2f1 of the one comb blade electrode 2f and the third comb blade portion 2g3 of the second comb blade electrode 2g have the same size as the heat generating sheet 1 When this region is to be heated, it is necessary to lay as many as five heating elements each having the heating element A divided into five parts. Therefore, according to the heating element B according to the first embodiment, the laying workability of the heating element B can be improved.

  In addition, in the heating element B according to the second embodiment, the heating element B and the power source D are connected by the two connecting wires 3f and 3g. On the other hand, in the heating element A according to the first embodiment, The heating element A and the power source D are connected by the five connecting wires 3a to 3e. Therefore, according to the heating element B according to the second embodiment, the number of connection wires can be reduced as compared with the heating element A according to the first embodiment, and therefore, the connection with the power source D is easy.

In addition, this invention is not limited to said each embodiment, For example, the following modifications can be considered.
(1) In each of the above embodiments, the heat generating layer 1b in the heat generating sheet 1 is formed of a carbon fiber dispersed film, but the present invention is not limited to this. The heating layer may be any resistor that generates heat when energized.

(2) In the first embodiment, the number of the strip electrodes 2a to 2e is five, and in the second embodiment, the number of the comb blade portions 2f1 to 2f3 and 2g1 to 2g3 in the comb blade electrodes 2f and 2g is three. However, the present invention is not limited to this. That is, the number of electrodes in the present invention may be three or more, and is appropriately set according to the installation space of the heating elements A and B.

(3) In each of the above embodiments, the comb blade portions 2f1 to 2f3 and 2g1 to 2g3 of the strip electrodes 2a to 2e and the comb blade electrodes 2f and 2g are formed in a straight line, but the present invention is not limited to this. For example, instead of a linear shape, a curved shape or a bent shape may be used. In this connection, the heat generating sheet 1 does not need to be rectangular, and may be set to an appropriate shape according to the application, and the strip electrodes 2a to 2e and the comb blade shape according to the shape of the heat generating sheet. What is necessary is just to set the shape of each comb blade part 2f1-2f3, 2g1-2g3 of the electrodes 2f and 2g.

(4) In the first embodiment, four opposed portions K1 to K4 are set by providing four strip electrodes 2a to 2e, and in the second embodiment, three combs are provided for each of the pair of comb blade electrodes 2f and 2g. Although the five opposing locations K5 to K9 are set by providing the blade portions 2f1 to 2f3 and 2g1 to 2g3, the present invention is not limited to this. What is necessary is just to set suitably the number of the strip | belt-shaped electrodes 2a-2e and the comb blade parts 2f1-2f3, 2g1-2g3, ie, the number of the opposing location in the heat generating sheet 1, as needed.

(5) In each of the above embodiments, a DC power source is used as the power source D, but the present invention is not limited to this. You may employ | adopt an alternating current power supply as needed.

(6) Each electrode (strip-like electrodes 2a to 2e) in the first embodiment is joined to the surface of the heat generating layer 1b by various joining techniques. For example, a conductive paint can be considered as this joining technique. That is, it is conceivable to adhere each electrode (the strip electrodes 2a to 2e) to the surface of the heat generating layer 1b by using a conductive paint instead of the conductive adhesive.

  This conductive paint is obtained by dispersing carbon fibers bearing conductivity (for example, fine conductive fibers made of carbon nanostructures) in a paint bearing adhesiveness. The paint is mainly composed of water, methylpyrrolidone, triethylamine, ether and the like. The conductive paint is adjusted by including a predetermined amount of CNT in such a paint. The content of CNT is, for example, about 2%.

  FIG. 5 shows a state in which the strip electrode 2a is adhered to the surface of the heat generating layer 1b using such a conductive paint 4, but the application of such a conductive paint 4 is not limited to the strip electrode 2a. The present invention can be applied to the other strip electrodes 2b to 2e, and can also be applied to the comb-shaped electrodes 2f and 2g in the second embodiment.

  Here, the heat generating layer 1b in each of the above embodiments includes carbon fibers (for example, fine conductive fibers made of carbon nanostructures) as a heat generating resistance material, like the conductive paint 4. That is, as the conductive paint 4, by using a paint containing a carbon fiber similar to the carbon fiber forming the heat generating layer 1b (for example, a fine conductive fiber made of a carbon nanostructure) as a conductive material, the stability is improved. It is possible to achieve excellent bonding.

  In the joining of each electrode and the heat generating layer 1b with the conductive paint 4 as described above, a stable connection resistance with respect to the impact of the temperature fluctuation and the change with time is obtained as compared with the joining by the conductive tape or the pressure bonding. It was confirmed that it could be realized.

A, B Heating element D Power supply K1-K9 Opposite location 1 Heating sheet 1a Sheet-like substrate 1b Heating layer 2a-2e Strip electrode 2f, 2g Comb blade electrode 2f1-2f3, 2g1-2g3 Comb blade portion 2f4, 2g4 connecting portion 3a-3e, 3f, 3g Connecting wire 4 Conductive paint

Claims (8)

A heat generating sheet that generates heat due to an energizing current;
A plurality of electrodes that are spaced apart from the heat generating sheet and feed power to the heat generating sheet;
A plurality of said electrodes are provided with a plurality of counter parts, A heating element characterized by things.   2. The heating element according to claim 1, wherein the heating sheet includes a heating layer that generates heat by the energizing current on both sides or one side of a sheet-like base material.   The heating element according to claim 2, wherein the heating layer is a carbon fiber-dispersed film in which carbon fibers are dispersed in a substrate.   The heating element according to claim 3, wherein the substrate is a paint.   The heating element according to any one of claims 1 to 4, wherein the plurality of electrodes are three or more belt-like electrodes each having a portion extending at an equal distance.   The heating element according to claim 5, wherein the plurality of electrodes extend linearly.   The heating element according to any one of claims 1 to 4, wherein the plurality of electrodes are a pair of comb-shaped electrodes provided with a plurality of portions extending at equal distances from each other.   The heat generation according to any one of claims 1 to 7, wherein a conductive paint in which carbon fibers responsible for conductivity are dispersed in a paint responsible for adhesion is interposed between the heat generating sheet and the electrode. body.

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