JP3560312B2 - Heater wire - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heater wire used for a heating device such as an electric blanket or an electric carpet, and more particularly to a heater wire having a structure capable of sufficiently reducing a magnetic field leaking from the heater wire when the heating device is used. It is.
[0002]
[Prior art]
FIG. 5 is a configuration diagram showing an example of a conventional heater wire. The heater wire 10 is formed, for example, by spirally winding a heating element wire 3A around the outer periphery of the core yarn 2, providing a polyamide resin-made fusion layer 4 around the outer periphery thereof, and further connecting the signal line 5 to the outer periphery thereof by a spiral. In most cases, the insulating layer 6 was wound around the outer periphery and the outer periphery thereof was provided with an insulating layer 6.
[0003]
When the temperature of the heating element wire 3A rises abnormally, the fusion layer 4 is melted by heat, and the heating element wire 3A and the signal line 5 are short-circuited, and the power supply is stopped by a safety device (not shown). Is done.
[0004]
[Problems to be solved by the invention]
By the way, when a heating device using the heater wire 10 having the conventional structure configured as described above is used and the heating wire 3A is energized, a magnetic field is generated from the heater wire 10 by a current flowing through the heating wire 3A. There is a problem that this magnetic field leaks outside.
[0005]
When the current flowing through the heater wire 10 is a high-frequency AC current, high-frequency magnetic noise is generated, which may adversely affect other surrounding electronic devices. When the current flowing through the heater wire 10 is a low-frequency AC current or a DC current, a leakage magnetic field corresponding to the current is generated.
[0006]
Recently, from the viewpoint of preventing adverse effects on the living body such as the human body, the intensity of these leaked magnetic fields is reduced as much as possible (in particular, in the case of a planar heating element such as an electric blanket, the distance between the heater wire 10 and the human body is reduced). Since the distance is extremely short, reduction of the leakage magnetic field is strongly desired.).
[0007]
Therefore, an object of the present invention is to provide a heater wire which can sufficiently reduce a leakage magnetic field and has a relatively simple configuration.
[0008]
[Means for Solving the Problems]
A heating element wire 3A is spirally wound around the polyester core 2 at a constant pitch, and a fusion layer 4 is provided on the outer periphery thereof. A signal line 5 is spirally wound around the outer periphery of the fusion layer 4 to form a wire. A heater wire 1 comprising a heating wire 3 having an insulating layer 6A extruded with polyvinyl chloride on the outer periphery thereof, and a lead wire 7 having an insulating layer 6B extruding polyvinyl chloride on the outer periphery of the stranded wire 9. ,
The heating wire 3 and the lead wire 7 are integrated to form the heater wire 1. Further, the heater wire 1 is configured so that the heating wire 3 generates almost no heat and the lead wire 7 does not generate heat or generates a small amount of heat.
[0009]
Since the heater wire 1 according to the present invention has a structure in which the heating wire 3 and the lead wire 7 are integrated, a current opposite to the current i flowing through the heating wire 3 is caused to flow through the lead wire 7 to generate the heating wire 3 from the heating wire 3. As a result, the magnetic field leaking from the heater wire 1 can be reduced by the heater wire 1 itself.
[0010]
Further, since the conventional heater wire 10 and the wiring process thereof can be used as they are, the manufacturing cost can be reduced.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings. Note that the present invention is not limited to this.
[0012]
FIG. 1 is an explanatory diagram illustrating a configuration of a heater wire 1 according to an embodiment of the present invention. In the heater wire 1, a heating element wire 3A is spirally wound around the outer periphery of the core yarn 2 at a constant pitch, and a fusion layer 4 is provided on the outer periphery thereof. The distance between the heating wire 3 provided with the insulating layer 6A on the outer periphery thereof and the lead wire 7 extruded from the insulating layer 6B on the outer periphery of the stranded wire 9 is made constant, and is extruded on the outer periphery thereof. This is a structure in which the heating wire 3 and the lead wire 7 are integrated by the provided insulating layer 8. The core yarn 2 is made of, for example, a wholly aromatic polyester or a wholly aromatic polyamide fiber. The heating element wire 3A is made of, for example, a flat copper wire of 0.06 × 0.34 mm, and the fusion layer 4 is made of, for example, nylon 11 or nylon 12 (melting point is about 180 to 185 ° C.). It is made of resin.
[0013]
The signal line 5 is, for example, a copper flat wire of 0.06 × 0.34 mm, and a copper alloy flat wire may be used instead of the copper flat wire.
[0014]
The insulating layer 6A is, for example, a polyvinyl chloride (PVC) resin. In that case, a polyester tape for preventing the plasticizer of polyvinyl chloride from migrating toward the signal line 5 may be wound between the signal line 5 and the insulating layer 6A.
[0015]
The lead wire 7 has, for example, 30 copper wires each having a wire diameter of 0.18 mm, and is provided with an insulating layer 6B formed by extruding and coating, for example, a polyvinyl chloride resin on the outer periphery thereof.
[0016]
Instead of the lead wire 7, for example, a stranded wire 9 formed by twisting 30 fine copper wires having a wire diameter of 0.18 mm may be used.
[0017]
The insulating layer 8 for integrating the heating wire 3 and the lead wire 7 is formed by, for example, extruding and coating a polyvinyl chloride resin.
[0018]
FIG. 2 is an explanatory diagram showing a leakage magnetic field measurement system for measuring a leakage magnetic field from the heater wire 1 of FIG.
In this leakage magnetic field measurement system A, one end of the heating wire 3A of the heater wire 1 and one end of the lead wire 7 are connected to an AC power supply AC, and the other end of the heating wire 3A and the other end of the lead wire 7 are short-circuited. In this configuration, the leakage magnetic field is measured by attaching the detection unit C of the magnetic field measuring device B to the heater wire 1. As indicated by the arrow, an alternating current i (solid line) flows through the heating wire 3 in a direction opposite to the current (dotted line) flowing through the lead wire 7.
[0019]
FIG. 3 is a table showing a result of measuring a leakage magnetic field with respect to power consumption by the leakage magnetic field measurement system of FIG. The comparative example is a measurement result for a conventional heater wire (see FIG. 5). The frequency of the AC power supply AC is 60 Hz. Further, as the magnetic field measuring device B, a single measuring device (combinanova, model name MFM10, manufactured by Toyo Technica Co., Ltd.) conforming to the VDU measurement standard MPR-II was used. FIG. 4 is a graph showing characteristics of a leakage magnetic field with respect to power consumption. In the graph, an immediate fixed point on the heater wire 1 is indicated by a “white circle”, and the characteristic of the leakage magnetic field is indicated by a dotted line. The measurement points according to the comparative example are indicated by “black circles”, and the characteristics of the leakage magnetic field are indicated by solid lines.
[0020]
3 and 4, the intensity of the leakage magnetic field applied to the heater wire 1 and the comparative example changes depending on the power consumption, but the intensity of the leakage magnetic field applied to the heater wire 1 is about 1/50 of the comparative example. It turns out that it is considerably reduced compared with the example.
[0021]
According to the above-described embodiment, by causing currents to flow in opposite directions to the heating wire 3 and the lead wire 7, the generated magnetic fields cancel each other, and the leakage magnetic field generated from the heater wire 1 is sufficiently reduced by the heater wire 1 itself. You can do it.
[0022]
【The invention's effect】
The heater wire of the present invention has a simple structure in which the heating wire and the lead wire are integrated, and unnecessary heat generated from the heater wire is provided by a simple means of flowing currents in opposite directions to the heating wire and the lead wire. It is possible to efficiently cancel out a stray magnetic field efficiently, and it is possible to sufficiently reduce the stray magnetic field. For this reason, the safety against the surrounding environment (electronic devices, living bodies, etc.) can be greatly improved. There are significant practical effects.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a configuration of a heater wire according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a leakage magnetic field measurement system for measuring a leakage magnetic field of a heater wire of FIG. 1;
FIG. 3 is a table showing the results of leakage magnetic field measurement by the leakage magnetic field measurement system of FIG. 2;
FIG. 4 is a graph showing characteristics of a leakage magnetic field with respect to power consumption.
FIG. 5 is an explanatory diagram showing a configuration of a conventional heater wire.
[Explanation of symbols]
1, 10 Heater wire 2 Winding core yarn 3A Heating wire 3 Heating wire 4 Melting fault 5 Signal wire 6, 6A, 6B, 8 Insulating layer 7 Lead wire 9 Twisted wire A Leakage magnetic field measuring system B Magnetic field measuring device C Detector AC AC power supply i AC current

Claims (2)

A heating element wire 3A is spirally wound around the polyester core yarn 2 at a constant pitch, and a fused layer 4 is provided on the outer periphery thereof. A signal line 5 is spirally wound around the outer periphery of the fused layer 4. A heater wire 1 comprising a heating wire 3 provided with an insulating layer 6A extruded from polyvinyl chloride on the outer periphery of the wire and a lead wire 7 having an insulating layer 6B extruded on the outer periphery of the stranded wire 9 from polyvinyl chloride. And
The heating wire 3 and the lead wire 7 are integrated , and a current opposite to the heating wire 3 is applied to the lead wire 7 so that the magnetic field generated from the heating wire 3 is canceled out by the magnetic field generated from the lead wire 7 and reduced. A heater wire characterized in that it can be used. 2. The heater wire according to claim 1, wherein the lead wire generates a small amount of heat or does not generate heat.

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