JPS603453Y2 - Noise prevention wire - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a noise prevention electric wire used in a high-voltage electrical system of an internal combustion engine of an automobile or the like.

High-voltage electric wires are wired between the ignition coil and the distributor in the high-voltage circuit of an automobile, or between the distributor and the sparking plug, but electromagnetic energy is generated during operation.
Not only radios installed in automobiles, but also radios, televisions, and communication equipment located near the vehicle are subject to severe noise interference.

For this reason, as automobiles, televisions, radios, etc. have become widespread in recent years, this noise disturbance has become a major social problem, and efforts are being made in various fields to solve the problem.

Conventional solutions include using a plug with a noise-preventing resistor, inserting a series resistor into the circuit, and adding noise-preventing ability to the wire itself. are widely known, but judging from an economical or technical standpoint, the most promising of these is to impart noise prevention ability to the wire itself.

The conventional structure of this type of electric wire is to use a high-resistance conductor made of carbon-impregnated fiber as the conductor, and to form an insulating coating on the periphery of the conductor, but this is not sufficient in terms of performance. However, it has been almost impossible to expect practical effects, especially in the low frequency band.

In addition, noise-preventing wires are also used in which a magnetic mixture coating is formed on the circumference of a magnetic metal wire, and a spirally wound nichrome wire and sheath are sequentially provided around the outer circumference, but this has a complicated structure. And it's expensive.

The present invention has been made for the purpose of providing a new and useful noise-preventing wire that exhibits sufficient noise-preventing ability over a wide frequency band, has a simple structure, and is inexpensive.

The gist of the present invention is that an amorphous metal wire is used as the metal resistance wire spirally wound around the center string.

The central string may be constructed from fiber, rubber, plastic or magnetic admixtures.

A magnetic mixture is made by uniformly dispersing magnetic metal powder such as iron powder or ferrite powder into rubber or plastic, and is usually formed by extrusion.

There are two ways to spirally wind amorphous metal wires: bare wires that are wound at intervals so as not to touch each other, and wires that have been insulated and then tightly wound spirally.

Amorphous metal refers to a non-crystalline metal, and is produced by rapidly cooling molten metal based on iron, nickel, cobalt, etc.

The obtained metal material is amorphous.

Characteristically, it has properties equivalent to or better than crystalline alloys in strength, resistivity, and corrosion resistance, and has extremely high magnetic permeability.

Two embodiments of the present invention will be explained with reference to FIGS. 1 and 2.

In the embodiment shown in Fig. 1, 1 is a central string cut from a bundle of fibers, 2 is a resistance wire cut from an amorphous metal wound spirally at intervals so as not to touch each other, and 3 is formed on the outermost periphery. It is an insulating coating.

In the embodiment of FIG. 2, 1' is a central string of magnetic admixture, and 2 and 3 are equivalent to the like-numbered elements of the embodiment of FIG.

With the noise prevention wire of the present invention as described above, the amorphous metal wire used as the resistance wire has a DC resistance of 1.4 times that of the conventional nichrome wire, and also has a much higher magnetic permeability. Therefore, in a low frequency band, an amorphous metal wire with high magnetic permeability causes loss to low frequency electromagnetic energy.

On the other hand, in a high frequency band, the inductance effect of the spirally wound amorphous metal wire causes loss to high frequency electromagnetic energy.

As a result, it is possible to prevent electromagnetic energy from being emitted to the outside over a wide frequency band, and a noise-preventing electric wire with sufficient noise-preventing ability is obtained.

In addition, when the center string is formed of a magnetic mixture, the loss of high-frequency electromagnetic energy is further increased.

Since the central string of the electric wire of the present invention does not have a particularly complicated structure and does not use any special constituent materials, it also exhibits the effect of reducing the price of the entire electric wire.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams showing two embodiments of the present invention. 1... Center string, 2... Spiral-wound resistance wire made of amorphous metal, 3... Insulating coating.

Claims (1)

[Scope of utility model registration request] A noise prevention electric wire characterized in that a resistance wire made of a spirally wound amorphous metal and an insulating coating are sequentially provided around the outer periphery of a central string.