JP2003045625A - Heating coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize heating coils. SOLUTION: In this heating coil C which is an electric heating wire 1 wound into a coil, the wire 1 is formed into a plate shape with its width larger than the thickness, the plate face 2 of the wire 1 faces the direction of coil length, and the shorter side face 3 faces the direction of coil radius.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating wire coil for use in various electric heating devices, and more particularly to an invention useful for a heating wire coil of a type that does not use a heater core.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, a heating wire coil C1 in which a heating wire 10 having a circular cross section having an electrothermal effect is wound in a coil shape is known. This type of heating wire coil may be wound around a heater core, housed in a sheath for use, or used as a heater as it is, mainly in the blower passage of an electric heating device. It is used for generating hot air by being placed in.

[0003]

The heating wire coil described above increases the amount of heat generated per unit length of the entire heater by winding the heating wire itself in a coil shape. There is nothing wrong with getting it.

Further, in order to miniaturize an electric heating device using a heater, it is desired to ensure a sufficient ventilation efficiency and make the ventilation passage as small as possible. In that case, the ventilation resistance of the heater itself is required. It became a problem, and the possible phenomenon was desired.

On the other hand, when the temperature of the heating wire itself of the heating wire coil rises and becomes high, the rigidity of the heating wire decreases,
There was a problem that sagging phenomenon also occurred together with ventilation resistance.

[0006]

The present invention has been made for the purpose of solving the above-mentioned problems of the heating wire coil of the prior art, and a heating wire having an electric heating effect is wound in a coil shape. In the wire coil, the heating wire has a plate shape with a width larger than the thickness, and the plate surface of the heating wire is oriented in the entire length direction of the coil and the short side end surface is oriented in the diametrical direction of the coil. Characterize.

[0007]

1 to 3 are views showing an embodiment of a heating wire coil according to the present invention. Reference numeral 1 in the figure indicates a heating wire, which is made of a known material having an electrothermal action such as nichrome wire, platinum, or tungsten. This heating wire 1 is a plate-shaped one having a width wider than its thickness,
This constitutes the first characteristic part of the present invention. Here, a rectangular cross-section is adopted as such a heating line, but the specific cross-sectional shape is not limited to this, and a chamfered corner or an elliptical cross-section may be used.

The heating wire 1 is wound into a coil,
In this case, the coil C is formed so that the plate surface 2 of the heating wire faces the entire length direction of the coil and the short side end surface 3 faces the diametrical direction of the coil, which constitutes the second characteristic part of the present invention.

The heating wire coil according to the present invention is best arranged when it is arranged in the air passage so that the wind W passes through the coil C as shown in FIG.

[0010]

EXAMPLE An example of specific specifications and performance of the heating wire coil of the present invention will be described below in comparison with a heating wire having a circular cross section of the prior art.

The heating wire of the heating wire coil of the present invention and the heating wire of the prior art having a circular cross section will be compared using wires having a resistance value close to each other per meter of length. Specifically, the former has a thickness of 0.16 mm and a width of 1.6 mm, and the latter has a diameter of 0.55 mm. In this case, the resistance values per 1 m of length are 5.11Ω and 5.18Ω, respectively. Becomes
FCH-2 was used as the material for the heating wire. The outer diameter of the coil is 8 mm and the resistance value of the coil is 12Ω.

[0012]

The heating wire coil of the present invention having the above construction has the following unique effects. (1) As is apparent from the above-described embodiment, the surface area of the heating wire can be made larger than that of the heating wire coil of the prior art, so the heat dissipation is good, and when compared with the heating wire coil of the conventional technology, The wire temperature of the heating wire itself can be lowered with respect to the heat atmosphere of the air heated by the wire coil. (2) On the other hand, as described above, when the air passage is arranged so that the wind crosses the coil, the surface exposed to the wind is the end surface on the short side of the heating wire, so the heating wire coil of the prior art generates heat. The area is smaller than the wire and the ventilation resistance is low, and ventilation efficiency can be improved. (3) As described above, since the wire temperature of the heating wire itself is low, the rigidity is less likely to be lost, and the ventilation resistance is less, so that the heating wire coil has less sagging. (4) As is clear from the above-mentioned embodiment, the total length of the coil can be shortened as compared with the heating wire coil of the prior art, and the effect of the above (2) can be combined to reduce the air passage for accommodating the coil. It is possible to contribute to downsizing of electric heating equipment.

[Brief description of drawings]

FIG. 1 is a perspective view of a heating wire coil of the present invention.

FIG. 2 is a side view of the same as above with a part of which is cut out in a stretched state.

FIG. 3 is a partially cutaway side view of the same in the compressed state.

FIG. 4 is a partially cutaway side view of a conventional heating wire coil in a stretched state.

FIG. 5 is a partially cutaway side view of the same in the compressed state.

[Explanation of symbols]

1 heating line 2 Plate surface (of heating line) 3 Short-side end surface (of the heating wire)

Claims (2)

[Claims] 1. A heating wire coil in which a heating wire having an electrothermal action is wound in a coil shape, wherein the heating wire has a plate shape having a width larger than its thickness, and the plate surface of the heating wire is oriented in the entire length direction of the coil. A heating wire coil, characterized in that the coil is formed with the end face on the short side oriented in the diameter direction of the coil. 2. The heating wire coil according to claim 1, wherein the heating wire has a rectangular cross section.