JP2000249355A - Surface heating unit and electric floor heating panel including it - Google Patents

Abstract

(57) [Problem] To provide a conventional electric heating floor heating panel, in a connection portion connecting a power supply line and a heating element inside a heating unit, the connection is incomplete, abnormal heat generation due to a defect occurs, and a problem such as scorching occurs. There is a risk. In addition, when a plurality of conventional floor heating panels are arranged adjacent to each other, the interval between the heating elements in the adjacent panels is wide, so that heat generation in an intermediate portion thereof is insufficient and temperature unevenness occurs. SOLUTION: An electrode wire of a surface heating element is connected to a power supply line via a lead wire with a temperature fuse on one side and a lead wire on the other side. One or more thermal fuses are arranged in the vicinity of the connection portion of the connection space, particularly in the central portion, so as to be blown when abnormal heating or the like occurs in the connection portion. In addition, by this, abnormal heat generation of connection part is sensed sharply,
Electricity can be cut off. When two such heating elements are arranged with their lead wires facing each other, both ends of such a surface heating unit have a heating area extending to the end, and the surface heating unit is heated to the floor. When arranged on a panel, it is possible to reduce temperature unevenness between adjacent panels.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electric heating unit and a floor heating panel using the same.

[0002]

2. Description of the Related Art It is known that a conventional heating element uses a plurality of thermostats and temperature fuses distributed over the entire surface of a heating section for controlling temperature and preventing abnormal heating. (Japanese Utility Model Laid-Open No. 2-62309)

[0003] Further, among the conventional heating elements, in the case of manufacturing by laminating a conductive plastic sheet from both sides with an insulating sheet, the lead wire is taken out from the surface heating element.
There is known a method of taking out from the tip or peeling off a part of the insulating coating at the heat generating part, connecting the part with solder or the like, and then insulating with hot melt or the like.

Conventionally, an electrically heated floor heating panel is generally manufactured by incorporating a heating element for waterproofing a heating element and a so-called surface heating unit combined with a soaking plate.

[0005]

In the conventional heating element, the connection is loosened or the contact resistance is increased due to repeated heating and cooling, metal oxidative deterioration, and the contact resistance is increased due to the peeling of the solder. There have been reports of accidents such as heat generation and sparks in the part, resulting in burning of flooring. In addition, by installing a thermal fuse or the like on or close to the heating element, the heating element is always heated to 50 to 80 ° C., so that deterioration due to heat is promoted and there is a risk that the function of the heating element may be impaired. Therefore, it is necessary to have a structure and a mechanism to ensure such safety and prevent serious accidents before they occur.

In the conventional heating element unit,
The non-heating area not including the surface heating element is wide, so that the floor heating panel incorporating the heating element unit is likely to have uneven temperature.

[0007]

In order to solve the above-mentioned problems, the present invention has the following structure and mechanism. That is, the invention of claim 1 according to the present invention includes an electric heating surface heating element, and at least one thermal fuse is provided in series with the lead wire near a connection portion between a lead wire and a power supply wire of the element,
This is a surface heating unit whose power supply is cut off at a set temperature or higher.

According to a second aspect of the present invention, there is provided the surface according to the first aspect, wherein the two surface heating elements are combined and the extended portions or the lead portions of the respective electrode wires are faced to each other. It is a heat generating unit, it is a heat generating part up to the end of the surface heat generating unit, and a connection part, a lead wire,
The system does not heat the power line.

According to a third aspect of the present invention, there is provided a surface heating unit according to the first or second aspect, wherein the surface heating unit has PTC characteristics. And has excellent safety.

According to a third aspect of the present invention, there is provided an electric heating floor heating panel according to any one of the first to third aspects, including such a surface heating unit.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram showing the structure of a lead wire 21 with a thermal fuse. Electrode wires 11 and 12 of the heating element are drawn out from the end of the heating element, and covered wires a serving as lead wires
Is connected. One or more thermal fuses c are provided between the covered electric wires a and b, and the thermal fuses c are covered with the protective tubes d. The other side of the covered electric wire b is connected to the power supply line 24.

FIG. 2 shows an assembly structure of a connection space of the surface heating unit. Two facing surface heating elements 1,
2 electrode wires 11 and 12 are connected to a lead wire 21 with a thermal fuse.
And the electrode wires 13 and 14 are connected to the lead wire 22.
After the connection, the surface heating elements 1 and 2 are subjected to insulation and waterproofing from both sides with the cover members 3 and 4 to be integrated. The lead wire 21 with a thermal fuse and the lead wire 22 are led out of the heating element from an intermediate portion of the cover member 3, and the extracted portion is also subjected to insulation and waterproof treatment. Lead wires 21 and 22 are connected to power supply lines, respectively. More preferably, the lead wire 22 is provided with a thermal fuse.

FIG. 3 is a partial longitudinal sectional view of a connection portion of the surface heating unit. Surface heating element 5 connected as shown in FIG.
Is laminated with an insulating layer 6 and a heat equalizing plate 7 made of an aluminum plate. The power lines 24 and 26 and the ground line 25 are wired on the waterproof sheet in the connection space of the surface heating unit.

FIG. 4 is a conceptual view of the surface heating unit as viewed in a plan view, showing a wiring structure in a connection space. The lead wire 21 with a thermal fuse and the lead wire 22 are connected to power supply lines 24 and 26, respectively. In addition, the ground wire connected to the heat equalizing plate is taken out from the connection space and connected to the ground wire 25. The connection portions are each made of an insulating material and subjected to insulation and waterproof treatment. The surface heating unit 8 of the present invention arranges a connection space between the two surface heating elements and does not require a connection space at both ends, so that it is possible to heat both ends of the heating element. Both ends are also insulated and waterproofed.

[0015]

The present invention has the following effects. In the present invention, even if the temperature rises abnormally due to a failure in the connection part, a temperature fuse is installed near the connection part, and the power supply to the surface heating unit is shut off by sensing immediately, so that the safety of floor heating is reduced. Can be enhanced.

Further, by arranging the connection space between the two surface heating elements arranged side by side, both ends of the surface heating unit are heated, so that uneven heat on the floor surface can be reduced and the comfort of the user can be improved. Enhance. In addition, since there is no heat generating part in the connection space, unnecessary heat is not applied to the connection part, so that the connection part is prevented from loosening, improving the safety of floor heating .

The use of the structure of the present invention in a surface heating element having PTC characteristics further enhances safety. Although it deviates from the present invention for the time being, it is noteworthy that if the reliability of the PTC characteristic is sufficient, the installation of the thermal fuse at the lead wire connection portion may be omitted.

[0018]

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a lead wire with a thermal fuse.

FIG. 2 is an exploded partial perspective view illustrating a connection space assembling structure of the surface heating unit.

FIG. 3 is a partial longitudinal sectional view of the surface heating unit.

FIG. 4 is a plan view of the surface heating unit.

[0019]

[Explanation of symbols]

a, b Insulated wire c Thermal fuse d Insulation tube 1, 2-sided heating element 3, 4 Coupling cover 5-sided heating element (waterproofing state of the surfaced heating element) 6 Insulation layer 7 Heat equalizing plate 8 Surface heating unit (Surface heating) 11-14 Electrode wire 21 Lead wire with thermal fuse 22 Lead wire 24, 26 Power supply wire 25 Earth wire

Continued on the front page F term (reference) 3K058 AA12 AA29 AA45 AA86 BA02 CA39 CA91 CE13 CE19 CE29 3K092 PP20 QA05 QB21 QB32 QB49 QC16 RF03 RF17 SS11 UC08 VV25 3L072 AA01 AB03 AC02 AD02 AD09 AD16 AE07 AF07

Claims (4)

[Claims] 1. A surface heating unit including an electric heating surface heating element, wherein at least one thermal fuse is disposed in series with the lead near the connection between the lead wire and the power supply line of the element. 2. The surface heating unit according to claim 1, wherein the surface heating unit includes two surface heating elements, and the extension portions or the lead wire portions of the respective electrode wires are connected to face each other. 3. A surface heating unit according to claim 1, wherein the surface heating element has PTC characteristics. 4. An electrically heated floor heating panel comprising the surface heating unit according to claim 1.