JPH066474Y2 - Sheet heating element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a planar heating element that can be used as a heating element over the entire surface up to the end.

(Prior art) A sheet-shaped heating element in which flexible electrodes are woven into both sides of a heating element formed by weaving heating wires and tropical extruded pieces, and a conductive base material is coated with a conductive paint. The sheet-like heating elements formed in this way have been frequently used as heating elements for floor heating, but these sheet-like heating elements need to be electrically and mechanically protected. It is well-known that it is obligatory to coat with a permeable outer covering.

(Problems to be solved by the invention) The planar heating element thus provided with an insulating coating has electrodes (2) on both sides of the heating section (1) as shown in the cross section of FIG.
Also, the insulating portion (4) existing on the outer side is a non-heat generating portion, and its end portion is a portion not directly involved in heating, so floor heating is performed by laying it out side by side as shown in FIG. In this case, there is a problem that the abutted portion has a lower temperature than the other portions and the temperature distribution becomes non-uniform.

Recently, floor heating units made by incorporating sheet heating elements into wooden tiles have become widespread, but in this case, the exterior material portion is also added and the non-heating area is further expanded. There is a non-heating zone with a low temperature and a width of about 80 mm.

In order to eliminate such inconvenience, a means for reducing the temperature difference between the non-heat generating part and the planar heat generating element by disposing a heat radiating plate wider than that is provided. Although taken, it still lacks comfort because the end temperature distribution is not improved.

In view of such conventional problems, the present invention has a structure in which a sheet heating element is simply improved so that it can be used as a heating portion up to the end. The purpose is to maintain the comfort by averaging the distribution.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides
In the device of (1), the electrodes (2) formed on the flexible strip are electrically connected to the opposite sides of the heat generating part (1) having a planar shape, and the electrodes (2) are arranged on both sides. The outer peripheral surface is covered with an electrically insulating outer cover (3), and further, the electrode (2) and the non-heat-generating insulating part (4) existing on the outer side thereof are electrode-coated.
It is characterized in that it is bent along the inner line of (2) and attached to the heat generating part (1).

Next, the invention of claim 2 is an electrode formed as a flexible strip on opposite side edges of a planar heat generating part (1).
(2) is electrically connected and arranged respectively, and its front and back outer peripheral surfaces are covered with an electrically insulating jacket (3),
Further, the electrode (2) and the non-heat-generating insulating part (4) existing on the outer side of the electrode (2) and the narrow heat generating part (1 _A ) adjacent to the inner side of the electrode (2) are bent inward and the heat generating part (1 ) To form a planar heating element.

(Operation) According to claim 1, the electrode (2) and the non-heat-generating insulating part (4) are bent and bonded to the heat-generating part (1), so that the edge is the outer cover (3).
The heat generating part (1) is present close to the other part, leaving the entire thickness, so that it can be fully utilized as a heat generating part.

According to the second aspect, since the narrow portion of the edge is the portion having the heat generating portion in two layers, the watt density is larger than the other portions,
As a result, the temperature of the edge portion rises.

Therefore, when it is used as a floor heating by butt-matching, the heat is dissipated to the non-heat generating part which is unavoidable in the installation, and the temperature is rather made uniform, which is useful for improving the temperature distribution. is there.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 4 are plan views of an intermediate product and a finished product according to an example of the present invention, in which (1) shows a heating part, (2) shows an electrode, and (3) shows a jacket. .

The heat generating part (1) is a planar woven heat generating structure formed by weaving a flexible heating element such as a heating wire and a tropical piece and an insulating thread.
It is formed in a flexible sheet-shaped heat generating portion having a well-known structure such as a planar coating film heat generating structure obtained by uniformly applying a conductive coating material to a sheet base material.

The electrode (2) has the flexibility that it is integrally connected by electrically connecting to the opposite side edges of the heat generating part (1) by a well-known means such as weaving a fine metal wire or sticking a metal foil. It is formed into a strip.

In this way, the heat generating part (1) integrally having the strip-shaped electrodes (2) on both side parts has the outer and outer peripheral surfaces of the outer cover having electrical insulation (3), for example, a composite having heat resistance and insulation resistance. It is covered with a resin film, but in order to cover it by sticking two sheet-like films together, a two-layer non-heating insulation part (4) must be formed on the outer side of the electrode (2). Inevitably, the total width dimension of the electrode (2) and the insulating portion (4) is about 50 mm, and the coated intermediate product is shown in FIGS. 1 and 3. .

With respect to this intermediate product, the electrode (2) and the insulating portion (4) on the outer side thereof are bent inward along the inner line of the electrode (2) and the bent portion is bonded to the heat generating portion (1) with an adhesive. The finished product shown in FIG. 2 and FIG. 4 is obtained by pasting together by means such as.

When the sheet heating element thus obtained is used in combination with a flooring material such as a wooden tile, a heat radiating plate is further provided at a predetermined portion of the wooden tile directly or through a protective sheet, if necessary. And assemble.

When it is used as a carpet, it is sandwiched between an insulating base material and a surface material to be bonded together.

It is needless to say that the above-mentioned sheet heating element can be used as a heating portion over its entire width because the heating portion (1) is present up to the ends of both sides, and therefore, when it is used by butt-laying as shown in FIG. Although the temperature of the part with a width of about 30 mm, which is the minimum required as a seam for the flooring, is slightly lower than other parts, this is much narrower than the conventional 80 mm width. As shown in the comparative example, the temperature distribution is significantly improved as shown by the line (a) with respect to the conventional case (see the line (c)).

Next, FIGS. 5 and 6 show another embodiment of the present invention, in which an intermediate product is the same as that shown in FIGS.
With respect to this intermediate product, the electrode (2) and the non-heat generating insulating part (4) and the narrow heat generating part (1 _A ) adjacent to the inner side of the electrode (2) were bent inward, and this bent part was A finished product is obtained by bonding the heating part (1) with an adhesive or the like.

The heat generating part (1 _A ) may have a narrow width of about 10 to 20 mm.By doing so, not only the heat generating part (1) exists up to the ends of both side parts, but also the heat generating part (1 _A). The watt density is higher at the end where () is overlapped.

Therefore, in this planar heating element, the temperature at the end will rise compared to other parts, but in the case of laying by butting,
As shown in FIG. 8, the temperature rising part indicated by the broken line radiates heat to the non-heat generating part of the joint margin to raise the temperature of the part, while the temperature lowers and the temperature averages as shown in line (b). The temperature distribution is thus improved.

As described above, in order to make the temperature distribution flatter, the width of the heat generating portion (1 _A ) may be selected as an appropriate value according to the conditions such as the width of the non-heat generating portion and the material.

(Effects of the Invention) The present invention is based on the electrode (2) and the non-heat-insulating portion existing outside thereof
By bending (4) and attaching it to the heat generating part (1), it is possible to position the heat generating part (1) to the ends on both sides, and it is possible to heat up to the end so that the low temperature band is eliminated. Temperature distribution can be improved.

In addition, since the insulation material is interposed between the electrode (2) and the heat generating portion (1) by being covered with the outer cover (3) and then folded and overlapped, no electrical problem occurs.

According to a second aspect of the present invention, the heat generating portion (1 _A ) having a narrower width is bent and the end portion is formed into a two-layer body of the heat generating portion, so that the heat generation amount at the end can be doubled and the temperature can be increased. The heat-generating part is the non-heat generating part that occurs at the butt part
It is possible to raise the temperature to the same extent as in (1), and the temperature distribution can be greatly improved.

[Brief description of drawings]

1 and 2 are plan views of an intermediate product and a finished product according to an example of the present invention, FIGS. 3 and 4 are cross-sectional views of FIGS. 1 and 2, 5 and 6 respectively. Is a plan view and a sectional view according to another example of the present invention, FIG. 7 is a plan view of a floor heating system using the example of the present invention, FIG. 8 is a temperature distribution explanatory diagram, and FIG. 9 is a conventional floor heating system. FIG. 10 is a cross-sectional view of a conventional sheet heating element. (1) …… Heating part, (1 _A ) …… Narrow width heating part, (2) …… Electrode, (3) …… Coating, (4) …… Non-heating insulation part.

Claims (2)

[Scope of utility model registration request] 1. An electrode (2) formed on a flexible strip is electrically connected to both side portions of a heat generating portion (1) having a planar shape so as to face each other, and the electrodes (2) are respectively arranged. The front and back outer peripheral surfaces are covered with a jacket (3) having an electric insulation property, and further, the electrode (2) and the non-heat-insulating part (4) existing outside the electrode (2) are connected to the electrode.
A planar heating element characterized by being bent along the inner line of (2) and being bonded to the heating section (1). 2. Electrodes (2) formed on a flexible strip are electrically connected to opposite side edges of a planar heat generating portion (1), respectively, and at the same time, the electrodes are disposed. The front and back outer peripheral surfaces are covered with an electrically insulating jacket (3), and further, the electrode (2) and the non-heating insulating part (4) existing on the outer side of the electrode (2) and the inner side of the electrode (2) are adjacent to each other. _A planar heating element, characterized in that a heating portion (1 _A ) having a width is bent inward and bonded to the heating portion (1).