JP2005294236A - Planar heating element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a planar heating element in which even if a part of the heater is cut, the other part of the heater is not affected. <P>SOLUTION: The planar heating element 1 is composed of an exothermic layer 21 which is applied or printed with a carbon paint in stripe shape on an insulating sheet 20, conductive lines 30, 31 which supply electric power to the exothermic layer 21, and a connector 40 fitted to the conductive lines 30, 31, and the exothermic layer 21 of stripe shape is connected in parallel to the conductive lines 30, 31. The planar heating element 1 is provided with at least two or more exothermic layers 21 on the insulating sheet 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a planar heating element used for floor heating or the like.

There is an electric heater for heating that uses a large number of planar heating elements and can be installed on the floor according to the size and shape of the site (Patent Document 1).
JP 2001-241683 A

In the invention shown in Patent Document 1, a large number of planar heating elements 1 are arranged side by side and connected to a floor surface while connecting convex terminals and concave terminals to each other.
Since each sheet heating element 1 forms a circuit by meandering the heating element 2 such as a nichrome wire between the power supply bypass lines A and B, when an abnormality occurs such as the heating element 2 being cut, The planar heating element 1 is not supplied with power and does not serve as a heater.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a planar heating element that does not affect other heater parts even if a part of the heater is cut.

In order to achieve the above object, the planar heating element of the present invention includes a heating layer in which a carbon paint is applied or printed in a stripe pattern on an insulating sheet, and a conductive strip for supplying power to the heating layer. It comprises a connection terminal attached to the conductive strip, and is formed by connecting the striped heat generating layer in parallel to the conductive strip.
Moreover, the planar heating element of the present invention is provided by providing at least two or more heating layers on an insulating sheet.
Moreover, the planar heating element of this invention can provide a temperature controller between each heat generating layer and a conductive strip.

The effect | action by the said problem-solving means is as follows.
When a power cord is connected to one of the connection terminals of the sheet heating element and energized, the heating layer is energized through the conductive strip, and the heating layer generates heat.
The heat generation layer is formed by applying or printing a carbon paint in stripes, and since this is connected in parallel to the conductive strip, even if a part of the heat generation layer is cut off, the current supply to that part is cut off. Then, the other part of the heat generating layer is energized and generates heat.
In addition, in a planar heating element provided with at least two heating layers, a temperature controller is provided between each heating layer and the conductive strip, so that one of the heating layers has an abnormal temperature rise. However, by simply shutting off the energization of the heat generating layer, the other heat generating layers are energized and generate heat.
A planar heating element having a required heating area can be formed by sequentially connecting a planar heating element to a connection terminal attached to the conductive strip via a connector or the like.
By forming and connecting a large number of planar heating elements according to the size and shape of the site, a floor heating device in which the planar heating elements are spread over the entire floor surface can be obtained.
Even when the floor area is spread over in this way, it is not necessary to generate heat.For example, a sheet heating element where furniture is placed is attached with a blocking member instead of a connector at its connection terminal to supply power. Can be cut off, and only the required planar heating element can generate heat.

Since the present invention has been described above, the following effects can be obtained.
<I> It is possible to provide a planar heating element that does not affect other heat generation layer portions even if a part of the heat generation layer is cut.
<B> Even if there is an abnormal temperature rise in one of the heat generation layers, the temperature controller can be operated to cut off the power supply and prevent an accident.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view showing a planar heating element, and FIG. 2 is a perspective view showing the relationship between connection terminals and connectors. FIG. 3 is a schematic view showing an electrical connection state of the planar heating element, and FIG. 4 is a perspective view showing an example of a floor heating material sandwiching the planar heating element. 5 and 6 are a plan view and a side view showing a state in which the planar heating elements are connected to the connection terminal via the connector, and FIG. 7 is a perspective view showing a state in which the blocking member is attached to the connection member. FIG. 8 is a view showing a state in which a temperature controller is attached to each heat generation layer, and FIG. 9 is an explanatory view showing a connection state of a number of planar heating elements.

<A> Planar heating element (FIGS. 1 and 2)
The sheet heating element 1 is formed by forming a heating layer 21 and conductive strips 30 and 31 on the surface of an insulating sheet (resin film) 20 having a substantially rectangular shape (about 60 centimeters in length and about 60 centimeters in width).
As the insulating sheet 20, for example, a synthetic resin sheet such as polyester, polyethylene, polypropylene, polyacetal, polycarbonate, or the like having insulating properties can be used.
On the surface of the insulating sheet 20, a carbon paint mainly composed of carbon powder is applied or printed in a substantially straight line in parallel at a predetermined interval to form a striped heat generating layer 21.
In this example, as can be seen from the figure, the heat generating layer 21 is formed by dividing one insulating sheet 20 into four parts.

The two conductive strips 30 and 31 are for supplying electric power to each heat generating layer 21, and are formed on the insulating sheet 20 by printing, for example, silver paint mainly containing silver powder. The conductor is not limited to silver powder, but may be copper, aluminum, molybdenum or the like.
In this example, as shown in FIG. 1, the conductive strip 30 is provided along the periphery, and the conductive strip 31 is provided in a cross shape so as to surround the four heat generating layers 21.
Each heat generating layer 21 is connected along one side of the conductive strip 30, and the conductive strip 31 and each heat generating layer 21 are connected by electric cords 32, 32.
Four connection terminals 40 are respectively attached to the center of each side of the insulating sheet 20.
The connection terminal 40 is electrically connected to the conductive strips 30 and 31 via the electric cords 33 and 34 as shown in FIG.
Therefore, each heat generating layer 21 is electrically connected by the connection terminal 40, the electric cords 33, 34, the conductive strips 30, 31, and the electric cord 32, and each heat generating layer 21 constitutes an independent electric circuit (see FIG. 3). ). In FIG. 3, only one connection terminal 40 is shown, and the other three are omitted.
An insulating film (not shown) is deposited on the insulating sheet 20 to which the heat generating layer 21, the conductive strips 30, 31, the electrical cords 32, 33, 34, and the connection terminals 40 are attached, and the two films are integrated. The sheet heating element 1 is configured by heat sealing.
Since the heat generation layer 21 and the conductive strips 30 and 31 are printed on the insulating sheet 20, the whole becomes extremely thin, even when sandwiched between heating members (heat conduction plate, heat insulation plate, etc.) There is no problem at all.

FIG. 4 shows an example of a floor heating material sandwiching the planar heating element 1.
A floor heating material is configured by stacking a backing material 11, a heat insulating material 12, a planar heating element 1, a heat conductive plate 14, and a flooring material 15 in order from the bottom.
The heat conductive plate 14 such as an aluminum plate eliminates temperature unevenness and makes the temperature uniform, but may be omitted.
On each side of the heat insulating material 12, four notches 13 for attaching the four connection terminals 40 are provided.

<B> Connection terminal (FIGS. 2, 5, and 6)
The connection terminal 40 is an electrical terminal attached to the approximate center of the four sides of the insulating sheet 20.
The connection terminal 40 is provided with two conductive metal plates 41 and 41 inside, and the outside is surrounded by an insulating member 42. Electrical cords 33 and 34 are connected to one end of the metal plates 41 and 41.
The connection terminals 40 are respectively arranged in the notches 13 of the heat insulating material 12, and the tips of the electric cords 33 and 34 are welded to the two conductive strips 30 and 31. In this example, the electric cord 33 is welded to the conductive strip 30, and the electric cord 34 is welded to the conductive strip 31.
The notch 13 has such a size that each connection terminal 40 does not protrude from each side of the sheet heating element 1 when the connection terminals 40 are arranged.
The connection terminal 40 is provided with a recess 43 and an insertion port 44 for inserting a connector 5 to be described later, and a number of sheet heating elements 1 are sequentially and electrically connected via the connector 5 as shown in FIG. You can connect.
In addition, the connection terminal 40 is provided with a groove (or protrusion) 45 that is concavo-convexly engaged with the connector 5 so that the sheet heating elements 1 are not erroneously connected to each other.

<C> Connector (FIGS. 2, 5, and 6)
The connector 5 is for being inserted into the connection terminal 40 and electrically connecting the planar heating elements 1 to each other.
The connector 5 is configured by installing two conductive metal plates 50 and 50 inside and surrounding an intermediate portion of the metal plates 50 and 50 with an insulating member 51.
By inserting the two metal plates 50 and 50 from the insertion ports 44 and 44 of the connection terminal 40, the metal plates 50 and 50 come into contact with the metal plates 41 and 41 of the connection terminal 40 and are electrically connected. .
One side of the connector 5 is provided with a protrusion (or groove) 52 that fits with the groove (or protrusion) 45 of the connection terminal 40.

<D> Blocking member (Fig. 7)
The blocking member 6 is inserted into the connection terminal 40 to electrically block the planar heating elements 1 from each other.
The blocking member 6 is configured by projecting two metal plates 60 and 60 at one end of an insulating member 61 such as plastic (see FIG. 7A).
The two metal plates 60 and 60 are inserted into the insertion ports 44 and 44 of the connection terminal 40.
Even if the metal plates 60, 60 come into contact with the metal plates 41, 41 of the connection terminal 40, the insulating member 61 is electrically cut off.
One side of the blocking member 6 is provided with a protrusion (or groove) 62 that fits with the groove (or protrusion) 45 of the connection terminal 40.
The recess 43 of the connection terminal 40 has such a size that the blocking member 6 does not protrude from the recess 43 when the blocking member 6 is inserted.
The blocking member 7 shown in FIG. 7B is an example in which four metal plates 70 are projected from both ends of the insulating member 71.
The metal plates 70 and 70 protruding from both ends are inserted into the insertion ports 44 and 44 of the connection terminal 40.
In this case, it is convenient when connecting adjacent planar heating elements 1 as shown in FIG.
In this example, the metal plates 60 and 70 are provided, but these may be omitted, and the blocking members 6 and 7 may be configured by only the insulating members 61 and 71.

<E> Temperature controller (Fig. 8)
A temperature controller 22 is interposed in an electric cord 32 that connects the conductive strip 31 and the heat generating layer 21.
The temperature controller 22 composed of a thermistor or the like automatically cuts off the energization when a set temperature (maximum temperature or the like) is reached.
Even if one of the heat generation layers 21 has an abnormal temperature rise and the temperature controller 22 is activated to cut off the power supply, each heat generation layer 21 is connected in parallel to the conductive strips 30 and 31. The heating layer 21 is energized as it is, and there is no problem.

<F> Power cord (Figs. 3 and 9)
The power cord 25 is for supplying electric power to the sheet heating element 1 and has one end connected to the connection terminal 40 and the other end connected to an outlet.
It is convenient to provide an overall temperature adjustment when a large number of planar heating elements 1 are connected via a control panel 26 in the middle of the power cord 25, and a function of detecting power leakage and shutting off the power.

<E> Action As shown in FIG. 3, when the power cord 25 is connected to one of the connection terminals 40 of the sheet heating element 1 and energized, each heat generating layer 21 is energized via the conductive strips 30 and 31, Each heat generating layer 21 generates heat.
Since each heat generating layer 21 is connected in parallel to the conductive strips 30 and 31, even if there is an abnormal temperature rise in one of the heat generating layers 21 and the temperature controller 22 is activated to cut off the current, The heat generating layer 21 is energized as it is, and there is no problem.
Moreover, even if a part of the heat generating layer 21 configured in a striped shape is cut, the other part of the heat generating layer 21 is energized and generates heat only by turning off the energization of that part.

Next, with reference to FIG. 9, the floor heating apparatus 10 which connected many planar heating elements 1a-1f is demonstrated.
First, the power cord 25 is connected to the connection terminal 40 of the planar heating element 1a located in the periphery, and the two planar heating elements 1b and 1c are connected to the other two connection terminals 40 via connectors 5 and 5, respectively.
A planar heating element 1 d is connected to the planar heating element 1 b via a connector 5, and a planar heating element 1 f is connected to the planar heating element 1 d via a connector 5.
The sheet heating element 1 c is connected to the sheet heating elements 1 d and 1 e via the blocking members 7 and 7, and the sheet heating element 1 e and the sheet heating element 1 f are also connected to each other via the blocking member 7.
When the blocking member 6 is connected to each of the peripheral connection terminals 40 and power is supplied from a power source (not shown) via the power cord 25, the sheet heating elements 1a, 1b, 1c, 1d, and 1f are energized, Complete the circuit.
That is, the sheet heating elements 1a, 1b, 1c, 1d, and 1f excluding the sheet heating element 1e generate heat.

The planar heating element 1 of the present invention is a flat and flexible planar heating element, and is lightweight and thin. It is easy and extremely effective as a floor heating seat.
Even when a sheet heating element 1 corresponding to the area (volume) of the room to be heated is prepared and laid out, the temperature controller 22 is interposed for each sheet heating element 1, so that heat is generated as described above. There is no problem if one of the layers 21 has an abnormal temperature rise, and there is no problem if a part of the heat generating layer 21 configured in a striped shape is cut.
Furnishing or the like is installed, and the sheet heating element 1 where heat generation is not required is attached with the blocking member 7, whereby the supply of electric power can be blocked and the floor heating device 10 becomes rational and efficient.
In addition, since the planar heating element 1 is configured with a certain small area, when the heating sheet is damaged or other accidents, only the corresponding part can be replaced.

The top view which shows a planar heating element. The perspective view which shows the relationship between a connection terminal and a connector. Schematic which shows the electrical connection state of a planar heating element. The perspective view which shows an example of the floor heating material which pinched | interposed the planar heating element. The top view which shows the state which connected the planar heating element to the connection terminal via the connector. The side view similar to FIG. The perspective view which shows the state which attaches the interruption | blocking member to a connection member. The figure which shows the state which attached the temperature controller to each heat generating layer. Explanatory drawing which shows the connection state of many planar heating elements.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ...... Sheet heating element 10 ... Floor heating device 11 ... Backing material 12 ... Heat insulating material 13 ... Notch 20 ... Insulating sheet 21 ... Heat generation layer 22 ... Temperature controller 25 ... Power cord 30, 31 ... Conductive strips 32-37 ... Electric cord 40 ... Connecting terminal 5 ... Connector 6, 7 ... Interrupting member

Claims (3)

  A heating layer in which carbon paint is applied or printed in a stripe pattern on an insulating sheet, a conductive strip for supplying power to the heating layer, and a connection terminal attached to the conductive strip, and the striped heating layer is A planar heating element that is connected in parallel to a conductive strip.   The planar heating element according to claim 1, wherein at least two heating layers are provided on the insulating sheet.   The planar heating element according to claim 1 or 2, wherein a temperature controller is provided between each heating layer and the conductive strip.

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