JP2000030846A - Electromagnetic wave suppression type heating wire with dummy wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic wave suppression type heating wire with a dummy wire never twisted in an electric warming tool. SOLUTION: A heating resistance wire H is wound on a core wire 2 made of a flexible resin, a flexible resin 3 having a melting point is covered on it, and an abnormal overheat detecting wire 4 is wound on it (a flexible resin 5a can be omitted) to form a heating wire 11. Two heating wires 11 are arranged near a flexible dummy wire 12 not related with heating, and the outside is covered with a skin 5, thereby the electromagnetic wave radiation from the heating wire of an electric warming tool such as an electric blanket, an electric sheet or an electric carpet is suppressed, and the occurrence of the twist of the heating wire is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic suppression type heating wire containing a dummy wire, and more particularly, to a heating wire used for an electric heating device such as an electric blanket, an electric mat, an electric carpet, and the like. 2 consisting of a wire and an abnormal overheat detection wire
The present invention relates to a dummy-wire-containing electromagnetic-wave-suppression-type heating wire in which a book heating wire is combined with a dummy wire that is not involved in heat generation.

[0002]

2. Description of the Related Art Two electric wires are arranged close to each other in parallel,
When a current of the same size and the opposite direction flows,
It is known that the magnetic fields due to the respective currents cancel each other, and that if an alternating current is used for the currents, the electromagnetic waves radiated from the respective wires cancel each other out, so that the amount of radiated electromagnetic waves can be greatly suppressed.

[0003] Even when an electric heating device such as an electric carpet or an electric blanket is heated by a commercial AC power source, an electromagnetic wave is emitted, though very weakly. It has been studied to suppress as much as possible the electromagnetic waves radiated from. As such an electromagnetic wave suppression type heating wire, a combination of two heating resistance wires H and an overheating detection wire for detecting abnormal overheating is used. That is, as shown in FIG. 3, the electromagnetic wave suppression type heating wire 1 is formed by winding a heating resistance wire H around a core wire 2 made of a flexible resin, and covering the flexible resin 3 having a melting point thereon. An abnormal overheat detection wire 4 was wound thereon, and further covered with a flexible resin 3 having a melting point, a heating resistance wire H was wound thereon, and the outside thereof was covered with a sheath 5 made of a flexible resin. Things. Reference numeral I shown in FIG. 3 is a heating current flowing through the heating resistance wire H.

In order to suppress electromagnetic wave radiation by the electromagnetic wave suppressing type heating wire 1, one end of two heating resistance wires H is short-circuited as shown in FIG.
There are two methods (not shown) of connecting the heating resistance wires H in parallel so that the directions of the currents are opposite to each other. In the heating circuit shown in FIG. 4, a power control element 6, a current cutoff switch element 7, and a thermofuse TF are connected in series to an electromagnetic wave suppression type heating wire 1 in which two heating resistance wires H are connected in series. It is connected to E. The fusing resistance HR is thermofuse.
This is the resistance for fusing TF. Solution sectional resistor HR has one end connected to the abnormal overheating detection line 4 is connected to the power source and the other via a diode D _1, D _2. When the power control element 6 is a unidirectional control element (not shown) such as a thyristor, any one of the diodes may be used.

That is, the heating resistor H is partially overheated, for example, causing a partial disconnection, so that the flexible resin 4 is melted. When a current flows through the circuit, heat is generated, the thermofuse TF is blown, and the heating circuit can be disconnected from the power supply. It should be noted that other circuits required for FIG. 4 are not shown. However, the above-described electromagnetic wave suppression type heating wire 1 has the following problem. First, when abnormal heating occurs and the heating resistance wire H comes into contact with the abnormal heating detection line 4, there is a possibility that the two heating resistance wires H may contact each other or conduct through the abnormal heating detection line 4 for some reason. There is. Further, when such contact occurs in the portion a of FIG. 4 (the connection portion of the electromagnetic wave suppression type heating wire 1 on the power supply side), the power supply is short-circuited, an excessive current flows through the heating circuit, and the thermal fuse TF is blown for several seconds. However, an excessive current may continue to flow, causing a fire or a bursting sound to damage the electromagnetic wave suppressing type heating wire 1, and a safety circuit for shutting off the power supply immediately after a short circuit occurs is required.

A second problem is that when the inner heating resistance wire H is abnormally overheated, heat is easily trapped in the electromagnetic wave suppression type heating wire 1 and easily reaches the melting point of the flexible resin 3. If the outer heating resistance wire H is abnormally overheated, it is difficult for heat to be trapped therein, and the outer cover 5 may be cracked due to overheating before the flexible resin 3 is melted.

[0007]

By the way, as shown in FIG. 5, the two heating resistance wires H are used to separate (two) heating wires 8, respectively, and to cancel out electromagnetic waves radiated from each. A double-track type electromagnetic wave suppression type heating wire 9 (FIG. 5) formed close to each other can be provided. Note that the other reference numerals shown in FIG. 5 indicate the same members as those described in FIG. 3, and redundant description is omitted.

The double wire type electromagnetic wave suppressing type heating wire 9 has the above-mentioned problems, that is, a problem that the two heating resistor wires H may come into contact with each other and short-circuit the power supply, and that the outer heating resistor wire H
It can be easily understood that the problem that the abnormal overheat detection is delayed or the outer skin may be ruptured can be solved.
However, as shown in FIG. 5, a new problem arises in that it is easily twisted (indicated by an arrow in FIG. 5). Therefore, when wiring is performed on an electric blanket, an electric bedding, or the like, the heating resistance wire in the twisted portion may be damaged due to turning over of the warming person, and local abnormal overheating may occur.

The present invention has been made in view of the problems of the above-described double-track type electromagnetic wave suppressing type heating wire, and provides a dummy line-containing electromagnetic wave suppressing type heating wire which is not likely to be twisted in an electric heater. It is intended to do so.

[0010]

In order to achieve the above object, a dummy-wire-containing electromagnetic-wave-suppression-type heating wire is formed by heating a heating wire of an electric heating device such as an electric blanket, an electric mat, or an electric carpet.
The heating wire is formed by winding a heating resistance wire on a core wire made of a flexible resin, covering the heating wire with a flexible resin having the same or different melting point, and then applying an abnormal overheating detection wire thereon. , And the two heating wires and a flexible dummy wire that is not involved in heat generation are arranged close to each other, and the outside thereof is covered with an outer skin.

The flexible resin having the above melting point is not particularly limited, except that it is a resin capable of maintaining stable characteristics for long-term use. Examples of general resins that can be used include polyamide resins and polyester resins. Any of these materials having a desired melting point and melting point difference by changing the composition may be used. For example, a polyamide resin has a melting point of 1 by changing the component composition.
It can be changed in the range from around 20 ° C. to around 270 ° C. In the case where the melting points of the flexible resins used for the respective heating wires are made different, they may be the same type of resin or different types of resins (for example, a polyamide resin having a melting point of 180 ° C and a polyester resin having a melting point of 220 ° C). ).

The dummy wire is not particularly limited except that it is flexible. For example, a flexible resin such as a polyamide resin or a polyester resin, a synthetic rubber, or the like can be used. At least one of the heating wires may be covered with a flexible resin on the outside of the abnormal heating detection line, and the two abnormal heating detection lines may be insulated from each other. When a resin having a melting point is used as the insulating flexible resin, a resin having a melting point higher than that of the flexible resin having a melting point used between the heating resistance wire and the abnormal overheat detection wire must be used. Must.

[0013] The two heating wires and the dummy wire may be arranged in parallel inside the outer skin, or may be arranged in a twisted manner. In any case, since the cross-sectional shape of the dummy line-containing electromagnetic wave suppression type heating wire can be formed in a circular shape or a triangular shape close to a circle, it is possible to eliminate the possibility that the heating wire is twisted. As the heating resistance wire and the outer skin, those conventionally used can be used as they are.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the accompanying drawings. 1 and 2, the two heating wires 11 and the dummy wire 12 are brought into contact with each other, and the outside thereof is formed of an insulating layer 13 made of, for example, vinyl chloride resin (may be omitted). Is formed, and the outer side thereof is covered with an outer skin 5 to form a rounded triangular shape as a whole. However, it is also possible to form a circular shape by twisting three pieces. The production of the dummy-wire-containing electromagnetic-wave-suppressing heating wire 10 can be performed, for example, by using a commercially available means for producing a power supply cable for outdoor wiring.

The two heating wires 11 are configured in the same manner as the heating wire 8 shown in FIG. 5. In each case, a heating resistor wire H is wound on a core wire 2 made of a flexible resin, and the heating wire 11 is wound thereon. Covered with a flexible resin 3 having a melting point such as a polyamide resin,
An abnormal overheat detection wire 4 is wound thereon, and the outside is insulated and covered with a flexible resin 5a. Also dummy line 12
A flexible resin processed to have a thickness substantially similar to that of the heating wire 11 by extrusion molding or the like was used.

Even if the flexible resin 3 having the melting point of the two heating wires 11 is melted almost at the same location, the two heating resistance wires H are short-circuited. Can be prevented. The dummy-wire-containing electromagnetic-wave suppressing heating wire 10 formed as described above suppresses electromagnetic-wave radiation by supplying a heating current having the same size and opposite direction to the two heating wires 11, and Since it can be formed into a circle or a shape close to a circle as shown in FIG. 2, it is possible to eliminate the risk of twisting, and when an electric blanket, an electric bedding, etc. is used by a warming person during sleep, fold-like wrinkles due to rolling over occur,
Even if the bending of the dummy wire containing electromagnetic wave suppressing type heating wire 10 becomes severe, it is possible to prevent the occurrence of torsion and the occurrence of abnormal overheating due to a local increase in resistance due to, for example, partial disconnection. .

In another embodiment of the present invention, the flexible resin 5a may be only one of the two heating wires 11. By doing so, the electromagnetic wave suppression type heating wire 10 can be made thinner. Even if you do this,
As in the case where each of the heating wires 11 is covered with the flexible resin 5a, it is possible to prevent a short circuit between the two heating resistance wires H.

The flexible resin 5a is applied only to the electromagnetic wave suppression type heating wire 10 and any one of the heating wires 11 of the embodiment shown in FIG.
In either case, the melting points of the flexible resins 3 having the melting points used for the two heating wires 11 can be different from each other. As another embodiment, the melting points of the flexible resins 3 having the melting points used for the two heating wires 11 are set to different melting points, and the respective abnormal overheatings are performed without using the flexible resin 5a. The detection line 4 is formed to be short-circuitable. In this case, even if any of the heating wires 11 is abnormally overheated, the flexible resin 3 on the lower melting point side is melted, and abnormal overheating can be detected.

The electromagnetic wave suppression type heating wire 10 that does not use the flexible resin 5a can improve the heat transfer efficiency because the electromagnetic wave suppression type heating wire 10 can be made thinner, and can simplify the manufacturing process of the heating wire 11. And the like.

[0020]

As described above, the electromagnetic wave suppressing type heating wire with a dummy wire according to the present invention described above is obtained by bringing two heating wires including an abnormal overheat detecting wire and a heating resistor wire close to a dummy wire not related to heat generation. Since it is arranged and its surroundings are covered with the outer skin, there is no danger of the two heating resistance wires coming into contact with each other due to the occurrence of abnormal overheating and short-circuiting the power supply. Since it can be formed, it is possible to eliminate the possibility that twisting of the heating wire that suppresses electromagnetic wave emission occurs.

Accordingly, even when the heating wire of a portion where a fold-like wrinkle occurs during heating, such as an electric blanket or an electric bedding, is liable to damage the heating resistance line, for example, when the weight of the warmer is applied, the heating resistance is also reduced. Damage to the wire can be prevented, and the reliability of the electric warmer can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view, partially cut away, of a dummy line-containing electromagnetic wave suppressing type heating wire according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a partially broken perspective view illustrating an example for describing a problem of the electromagnetic wave suppression type heating wire.

4 is a heating circuit diagram using the electromagnetic wave suppression type heating wire shown in FIG.

FIG. 5 is a partially cutaway perspective view illustrating another example for describing the problem of the electromagnetic wave suppression type heating wire.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electromagnetic wave suppression type heating wire 2 Core wire 3 Flexible resin 4 Abnormal overheating detection wire 5 Outer skin 10 Dummy line containing electromagnetic wave suppression type heating wire 11 Heating wire 12 Dummy wire 13 Flexible resin H Heating resistance wire

Continued on the front page F-term (reference) 3K034 AA02 AA13 AA23 BA08 BA12 BC06 BC13 EA15 FA40 GA04 HA04 HA05 HA10 3K058 AA12 AA16 AA34 AA41 BA02 BA03 CA02 CA23 CA52 CA55 CA78 CE02 CE12 CE16 3K092 PP05 QA03 QB02 QV03 VB27 REB27 VV40

Claims (3)

[Claims] An electric heating device such as an electric blanket, an electric bedding, and an electric carpet has two heating wires, and the heating wire is formed by winding a heating resistance wire around a core wire made of a flexible resin, and heating the heating wire. Are covered with flexible resins having the same or different melting points, and an abnormal overheat detection wire is wound thereon, and the two heating wires and a flexible dummy wire that is not involved in heat generation are arranged close to each other. An electromagnetic wave suppression type heating wire containing a dummy wire, the outside of which is covered with an outer skin. 2. A heating apparatus according to claim 1, wherein at least one of said heating wires is covered with a flexible resin outside said abnormal heating detection line, and said two abnormal heating detection lines are insulated from each other. An electromagnetic wave suppression type heating wire containing the dummy wire according to 1. 3. The heating wire according to claim 1, wherein the dummy wire is made of a flexible resin or synthetic rubber.