JPS60200484A - Heater element - 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 FIELD OF INDUSTRIAL APPLICATION The present invention relates to a heater element that utilizes electrical energy, and provides a heat source for use in heaters, cookers, drying equipment, and the like.

Conventional Structure and Problems As shown in FIG. 1, the heater element of a conventional planar heater is formed by forming a metal foil into a desired pattern 1 by photo-etching or the like.

2.7. (1) Chemical punching by photoetching uses a film mask, so the cost equivalent to the mold can be reduced.

(2) Newly designed parts can be produced in a short period of time.

(3) Flexibility can be provided in design.

(Changes in the twisting design can be made easily.) (4) Extremely thin metal plates can be easily processed with high accuracy without distortion (the thinner the processing accuracy, the higher the processing accuracy).

(5) No cracks or processing distortions occur in the parts.

Although it has many characteristics, it also has many problems.

The main problem is (1) Productivity is relatively low and economic efficiency is poor.

(2) Since chemical punching uses corrosive liquid, the cost of pollution treatment equipment is high.

(3) There is a limit to the thickness of the material that can be punched (MAX,
1.5 pharynx).

(4) It is difficult to produce parts with sharp corners.

(5) A relatively high level of skill is required of the worker.

(6) Due to the punching work, a holding frame 2 is required on the outer periphery, and there is work required to separate the pattern 1 from the holding frame 2 and print three pages.

As described above, the cost of conventional heater elements is high, and the reality is that they are used only for special purposes.

OBJECTS OF THE INVENTION The present invention attempts to significantly improve various problems while taking advantage of the features of conventional heater elements.

Structure of the Invention The present invention involves forming a punching metal having square or pentagonal openings into a desired pattern.
By providing power terminals in several locations, problems with conventional heater elements, such as the need for pollution treatment equipment during chemical punching using photoetching, are eliminated, productivity is increased, dimensional accuracy is high, and resistance values are less likely to vary. It is intended to provide a heater element.

DESCRIPTION OF EMBODIMENTS As shown in FIGS. 2 and 3, the heater element of the present invention is produced by punching a metal foil into a punched metal shape having square or pentagonal openings, forming a desired pattern,
It is basic to provide at least two power extraction terminals.

Examples of the present invention will be described below. Metal foil bodies applicable to the present invention are Fe-Cr, Fe-Cr-A
℃.

Any material that can be used as a resistor, such as Ni-Cr, stainless steel, or aluminum, may be used, but Fe-Cr may be used.

Electric heating alloys such as Fe-Cr-AR have a high volume resistivity as shown in Table 1, but have poor ductility and a diameter of 200 μm.
It is difficult to make the following foil body. Therefore, it can be applied when the plate thickness is 200 μm or more, but it is not suitable when the thickness is 2001 tm or less. If the plate thickness is 2001tm or below, 1
Materials with high elongation such as 'Ji-Or alloy for electric heating or stainless steel are suitable.

The following margins are 5 spaces.Table 1 5US-430 was used in the embodiment of the present invention. The reason for this is that it is easy to form into a foil body, has a large temperature coefficient of resistance, and has high safety because the resistance value increases as the temperature rises. The inrush W number is large, and the W number decreases as the temperature rises. Therefore, since the temperature is 6/-7, Figure 2 shows the metal foil body (5US-430 in the example).
square openings 3 are punched out from the hole (to, 1), leaving evenly spaced metal parts 4 through which current flows. It can be set arbitrarily to match the resistance value required for the width H of the metal part 4. Reference numeral 6 denotes power extraction terminal portions, which are provided at at least two locations. By cutting the metal part 4 leaving a part 6 of the end face, it is considered that the resistance value does not change even if the dimensions vary. In addition, 6 also acts as a fin, increasing the heat dissipation effect. Since the rounded square openings 3 are punched out continuously, there is little variation in three dimensions, and assembly into equipment is easy.

FIG. 3 has the same basic configuration as FIG. 2, but the opening 3 is formed in a pentagonal shape.

In the embodiments, the apertures are square or pentagonal, but the scope of the present invention falls within the scope of the present invention if the apertures have a shape such that rl]H of the metal part 4 through which the current flows is the same everywhere. .

From the standpoint of heater design, it is important to make the width H of the metal part 4 the same everywhere. It is easy to separate and set the resistance value, and the pattern is the same, so productivity is high.
It has the characteristics that the temperature outside fj becomes uniform.

Effects of the Invention As described in 2, the heater element of the present invention is formed by punching out square or pentagonal openings from a metal foil body to form a desired pattern, and providing at least two power extraction terminals. As a result, there is little variation in dimensions, variation in resistance value can be reduced, temperature distribution is uniform, productivity is high, heater design is easy, and it is of high industrial value.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional heater element, and FIGS. 2 and 3 are plan views of heater elements according to embodiments of the present invention. 3...--Opening part, 4...Metal part, 6...
...Terminal section.

Claims (1)

[Claims] Square or pentagonal openings are punched out of a metal foil and formed into a desired pattern, leaving evenly spaced metal parts through which current flows [7. A heater element provided with at least two power extraction terminals.