JPS59167985A - Heat generating 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 The present invention relates to an improvement in a heating element for generating hot air using a heating wire, and unlike a hot air generating device using a burner, the heating atmosphere is non-oxidizing, and the nozzle The shape allows for minimal local heating, delicate temperature control, and non-contact heating for heating means such as a cold iron, making it suitable for automatic machines. At present, the demand for λ trowels is rapidly increasing because they are easy to apply and the base material of the λ trowel does not migrate into the object to be heated. However, even such hot air generators using heating wires have the following drawbacks. In other words, in the conventional heating element (IJ), as shown in Fig. 6, the heating wires (IJ) are wound in a coil shape with the heating wires spaced apart from each other due to the fear of short circuit between the heating wires (IJ). It was something. Therefore, when it was incorporated into automatic machinery, etc., it required a large space and was difficult to handle.

The present invention was made in view of the drawbacks of the conventional example, and its purpose is to
An object of the present invention is to provide a heating element whose total length can be significantly shortened.

Hereinafter, the present invention will be described in detail according to illustrated embodiments. FIG. 7 shows a hot air generator (A) using a heating wire (1) according to the present invention.
) is an external perspective view of one embodiment of the invention, and Figures 1 and 3 show its internal structure. (2) is A, 10. It is a ceramic insulating tube made of ceramic, and a thin T+t hot wire (1) is wound around its outer periphery in a coil shape. The heating wire (1) is wound in an elliptical shape as shown in the figure.
are shifted by a certain angle and wound closely or very close to each other (for example, about 0.1 to 0.2111 m), increasing the effective contact area and shortening the total length (n) /J''
We are trying to make it easier.

A coil (3) is wound around the tip and rear end of the insulation tube (2) to prevent the heating wire (1) from deforming and expanding when heated with electricity. Prevents it from falling off. An oxide film is formed on the surface of the heating wire (1) by energizing or baking in an oxidizing atmosphere. The thickness of this carbonized film is similar depending on the formation conditions, but from 1 to 100
It is on the order of microns. The heating wire (1) has a reverse common wire a7-
Since IvlI is used, the main component of the oxide film is chromium oxide, and if other oxides such as cerium, calcium, thorium, aluminum, magnesium, silicon, etc. are added, these oxides also make up the oxide film. I will do it. An oxide film may be formed by baking or chemical treatment, but if it is present as an additive element, when the oxide film peels off, it will die in that area and a new oxide film will be formed. , without damaging the heating wire (1). Further, a thin protection coil (4) is wound around the starting end and the terminal end of the heating wire (1). At the starting end, as shown in Figure (A), a protective coil (4) is attached to the tip of the large-diameter central conductor (5) that has been pushed through the insulating tube (2).
Both are wound with a 4-wound coil (6) and A-welded.

The terminal end of the heating wire (1) is connected to a cord (8) with a metal strip (7) wrapped around the first insurance coil (4) as shown in Figure (B).
wrapped around and welded. Similarly to the center conductor (5), other cords (8) are K-welded. The heating wire (protective coil (4)) is wound here because it is a vulnerable area due to the influence of FC heat around the welded area during m/rc welding, and is caused by drafts, external forces, and shock. The wire is more likely to break due to force. Firstly, the wind passing near the tip of the heating wire (1) is already at a very high temperature, so the temperature drop in the heating wire (1) is small and the state becomes red-hot. This is to improve the mechanical strength against the point where the wire is easily broken due to a decrease in mechanical strength.The heating wire (1) configured in this way is placed inside the quartz glass tube (9). The cord (8) is clamped and fixed to the rear end of the quartz glass QIF (9) using the fixing tube (10) as shown in Figure 3. (11) is a protective metal tube, and the rear end is This inner protrusion (
12), an outer 6 provided at the rear opening edge of the quartz glass tube (9)
The part (13) is K-shaped so that it can be engaged. While the quartz is held in place by the eye of the lath tube (9), the outer 4g portion (13) is coated with an adhesive (14) such as silicone rubber and adhered to the inner protrusion (12). (15) is a protective metal tube (11
) with a silicone rubber tube attached to the cord (
8th hole was pushed through. (16) is a nipple that is screwed onto the rear end of the protective metal tube (11).

(17) is a peephole drilled in the front half of the storage metal tube (11), and is used to observe the red-hot state of the heating wire (1).

However, when this hot air generator (A) is attached to the heating part of an automatic machine, and the nipples (16) and K air pipes are all connected and energized, the heating wire (1) becomes red hot, and the air pipes 1) nipples ( The wind blown into the quartz glass tube (9) through 16) comes into contact with the heating wire (1), becomes high temperature, and is blown out through the opening at the tip.

-Example- Heating wire: Wire diameter 00.49 type FCH1 or 2 insulation tube: ■
2×03 Aao6 Purity 98% or more Protective coil double wire diameter■
0.2 Quartz glass tube 208.2×■1o, 3) If the applied voltage and number of turns are determined so that the voltage between the heating wires is 4V or less, even if one heating wire is tightly wound. No short circuit occurs between them. Note that the coil shape is not limited to that of this embodiment, and the insulating tube (2) does not have to be wound in JK turns.

As described in the present aAd, since an insulating film such as an oxide film is formed on the surface of the heating wire, adjacent heating wires are brought into contact with each other or brought close enough to touch each other and wound into a coil shape. However, there is an advantage that short circuits do not occur between adjacent heating wires, and the total length of the X heating element can be made very short.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a hot air generator ρ using the present invention, Figure 1 is a vertical sectional view of the same as the above, Figure 3 is a perspective view of the inside of the quartz glass tube of the same as the above, Figures (A) and (B) are Inventor Asa Kakudo Nishibori 1) Shigeru

Claims (3)

[Claims] (1) A heating element characterized in that an insulating film such as an oxide film is formed on the surface of a heating wire, and adjacent heating wires are brought into contact with each other or so close to each other that they are wound into a coil shape. . (2) The heating element according to claim 1, characterized in that the constant pressure between adjacent heating elements is less than or equal to V. (3) The heating element according to claim 1, characterized in that a protective coil is wound around the starting end and the terminal end of a heating wire that is connected to another member.