JPS6147087A - Heating wire of sheet heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This relates to the heating wire of the heater.

The structure of the conventional example and its problems The heat generation line of the conventional vehicle seat heater is shown in Figure 1a.
As shown in 1b, a heating element 1 is constructed by twisting a plurality of heating element wires, and a fluororesin,
PVC, electron irradiated PVC1 polyethylene, polyamide resin! As shown in FIGS. 2a and 2b, a ribbon-shaped heating element wire 3 that has been subjected to foil processing is attached to a core body 4 made of a core thread of polyester or the like. Wrap it in a spiral, then fluororesin and PVC on top.

The outer skin 5 is made by tubing made of electron-irradiated PVC, polyethylene, polyamide resin, etc., and the outer skin 5 shown in FIG.
As shown in %b, a plurality of heating element wires are twisted together to constitute a heating element 11, and this heating element 11 is spirally wound around a core body 12 made of a bundled yarn of polyester or aromatic polyamide, There is a tubing with outer skin 1a on the outside. However, in the case shown in Figure 1,
Since the heating element 1 is constructed by twisting a plurality of heating element wires, it is strong against small bending, but has low tensile strength. Moreover, in the one shown in FIG. 2, since the core body 4 is made of a core thread of polyester or the like, it has strong strength but is weak against small bending.

Figure 3 was created to solve the problems of the heating wires shown in Figures 1 and 2.It has high tensile strength and is resistant to bending. The so-called end of life is the breakage of the heating wire. The behavior at this time is
Each of the heating elements made of multiple ultra-thin pieces is durable,
Due to stress and deterioration over time, wires gradually break.

Normal vehicle seat heaters are DC 6V, 12V, 24''
Used in V, etc., and designed for 30 to 60 W/back and buttocks per seat. Therefore, even though the voltage is low, a current of several amperes flows, so a very high-density current flows through the last remaining heating element wire, causing red heat and sparks.
Then, the final line is disconnected. Although it is extremely rare, in the worst case, there is a risk that the materials to be returned may be inflamed. In particular, according to experiments, the heat-generating wires after disconnection are bent and stressed, causing
Contact again.

It was found that the largest amount of red heat and sparks were generated when It can also be seen structurally that the frequency shown in FIG. 1 is high.

Purpose of the Invention The present invention has been made in order to solve the above-mentioned conventional problems, and provides a sheet that is strong in tensile strength and bending, and is safe even when the so-called heating element wires die when considering its application. The purpose is to provide a heating wire for a heater.

Structure of the Invention In order to achieve the above object, the present invention comprises a heating element made of one or more heating element wires coated with insulation, and this heating element is spirally wound around a bundled thread. It was there.

DESCRIPTION OF THE EMBODIMENTS In FIG. 4 aSb and FIG. Insulating coating 2 with a material made of modified polyester, etc.
This heating element 19 is further spirally wound around a core body 22 made of bundled yarns of polyester or aromatic polyamide. Reference numeral 23 denotes an outer skin made of fluororesin, PVC, PVC1 polyethylene irradiated with electrons, polyamide resin, etc. By tubing this outer skin 2a to the outside of the heating element 19, the heating wire 24
It consists of This polyester bundled yarn 22 is 50
A yarn of 0 denier has a tensile strength of 4 kg or more. Further, in order to make the heating wire 24 thinner, when a bundled yarn of aromatic polyamide is used, the yarn has a tensile strength of 8 kg or more with a yarn of 400 denier. Furthermore, if this aromatic polyamide bundled yarn is used, the heating wire 24 can be made thinner, so that when a vehicle seat heater equipped with this heating wire 24 is arranged on the seat 18 as shown in FIG. This also makes it possible to eliminate the discomfort of the seat 18.

FIG. 6 shows a vehicle seat heater having a heat generating wire 24 according to the present invention. Reference numeral 15 and 15' denote a heavy body with adhesive for clamping and fixing the heat generating wire 24 by thermocompression bonding means. be. 16 is a power lead wire connected to the heating wire 24.

FIG. 7 shows a vehicle seat heater 17 as shown in FIG.
17' is shown disposed on the seat portion 18a and backrest portion 18b of the seat 1θ, and this vehicle seat heater 1
7.17' is disposed under the skin part of the seat 18. Effects of the Invention As described above, according to the present invention, each of the one or more heating element wires is Each is insulated to form a heating element,
In addition, since this heating element is further spirally wound around a core made of bundled yarns of polyester or aromatic polyamide, the heating element strands are subjected to almost no tensile or contractile force due to bending stress, and the core is As a result, good bending properties can be obtained.Also, to withstand the tensile force of the heating wire itself, a core made of bundled yarns of polyester or aromatic polyamide is used. Because of this, it is possible to obtain products with high tensile strength. In addition, since each heating element wire is insulated, even if the wires come into contact with each other again after being disconnected,
It is safe and does not conduct electricity. In addition, even in the case of red hot spark disconnection, the core becomes 2. In addition, the additional insulation coating on the outermost periphery as in the example is to protect the insulation coating applied to each heating element element wire, and provides external mechanical protection and increases the bending radius. By reducing stress on the strands, the bending strength can be further increased.

If the purpose is to increase the bending strength, the same effect can be obtained by constructing the heating element by further twisting a plurality of insulation-coated heating element wires. Furthermore, since the heating wire can be made thinner, it has various excellent features, such as eliminating the discomfort of the seat when a vehicle seat heater is installed on the seat.

It is.

[Brief explanation of drawings]

1, 2, and 3 each show a conventional heating wire, where a is a perspective view, b is a side view, and FIG. 4 is a heating wire according to an embodiment of the present invention. 5 is a cross-sectional view of the heating wire element, FIG. 6 is a perspective view of a vehicle seat heater using the same heating wire, and FIG. 7 is a perspective view of the same seat heater. It is a perspective view of the seat arranged. 19... Heating element, 22... Core body, 23
...Outer covering, 21...Insulating covering, 2o.
...Heating element wire, 24...Heating wire. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Diagram (Q)
, C1) Figure 2 ((2)
(b) Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) A heating element is composed of one or more heating element wires coated with insulation, and this heating element is spirally wrapped around a core made of a bundled yarn made of polyester or aromatic polyamide. The heating wire of the seat heater is wrapped around it. (2) The heating wire of the seat heater according to claim 1, which is formed by applying an insulating coating to the outermost periphery.