JPH11339924A - Manufacture of surge absorbing element and surge absorbing element thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and accurately set a spark gap between terminal electrodes by opposedly disposing the terminal electrodes set to a predetermined dimension shape on both ends of an insulator set to a predetermined dimension shape and to stably manufacture a surge absorbing element having a discharge start voltage of various standards by appropriately selecting and combining the insulator and the terminal electrodes manufactured to various standards. SOLUTION: A space of a spark gap S is defined by engaging terminal electrodes 21 of a surge absorbing element 1 with an opposed end 20e of an insulator 20. Then, the terminal electrode 21 having an extending portion 21e and the insulator 20 are variously selected to define the spark gap S of various standards. Further, a position relationship of the terminal electrodes 21 in a discharge space by forming the insulator 20 to a rectangular flat plate shape, matching the extending portion 21e of the terminal electrodes 21 to a flat plate of the insulator 20 and forming a flange 21f on the terminal electrodes 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surge absorbing element, and more particularly to a surge absorbing element capable of setting spark plugs of various standards by combining various prescribed insulators and terminal electrodes of various standards. The present invention relates to a method for manufacturing the same and a surge absorbing element using the same.

[0002]

2. Description of the Related Art As shown in FIG. 6, for example, a conventional surge absorbing element 9 has (A) a thin film electrode 91 formed on the surface of a flat insulator 90a by printing or etching. (B) a cylindrical insulator 90b with terminal electrodes 92b attached to both ends thereof, (C) an insulator 90c
Is a narrow body, and terminal electrodes 92c are mounted on both sides thereof, or surge absorption in which a discharge phenomenon occurs only between the conical or (E) spherical terminal electrodes 92e and 92d without intervening other materials. Elements 9 (ae) are widely known.

[0003]

However, the above (A)-
Since the surge absorbing elements 9a to 9c having the configuration (C) are of surface discharge, the discharge path is not stable, the discharge start voltage varies, and the allowable error of the discharge start voltage is ± 30% to 40%.
And it was a big one. To stabilize these,
Aging at a high voltage for 1 to 2 minutes was required, which resulted in an increase in the number of steps and equipment.

In the surge absorbing elements 9d and 9e having the above-described configurations (D) and (E), the discharge path is specified because of the point discharge. Is very difficult and complicated, and the adjustment of the spark gap is done by manual operation using a thickness gauge.
As a result, large variations occurred in the discharge starting voltage. For this reason, the yield of products is low, and further, there is a major problem in manufacturing efficiency and structure such as a fragile change in the spark gap due to an external shock.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and has two ends of an insulator having a predetermined size and shape.
By arranging the terminal electrodes set to a predetermined size and shape to face each other, the spark gap between the terminal electrodes can be easily and accurately set, and these insulators and terminal electrodes manufactured to various standards are appropriately selected. It is an object of the present invention to provide a method of manufacturing a surge absorbing element capable of stably manufacturing a surge absorbing element having a discharge starting voltage of various standards by combining them, and a surge absorbing element using the same.

[0006]

In order to achieve the above object, a method for manufacturing a surge absorbing element according to the present invention is configured as follows.

That is, in a method of manufacturing a surge absorbing element in which a spark gap is formed between terminal electrodes opposed to each other in a discharge space, a terminal electrode having a predetermined length extending portion is replaced with an insulator having a predetermined length. The gap between the spark gaps is defined by fitting to the opposite end of the spark plug.

Further, any one of the terminal electrodes having the extension portions set to various lengths is selected from any of the insulators set to various lengths, and the opposite end portion of the insulator is selected. The spark gap according to the present invention is characterized in that spark gaps of various standards are manufactured by being fitted to the spark plug.

Further, the insulator is formed in the shape of a rectangular flat plate, and the extension of the terminal electrode is made to extend along the flat plate of the insulator.
By forming a flange extending in a direction substantially perpendicular to the extending direction on the terminal electrode, the X axis of the terminal electrode in the discharge space,
A positional relationship on the Y axis and the Z axis is set.

[0010] Still further, the positional relationship on the X-axis, the Y-axis, and the Z-axis of the opposing terminal electrode is set by engaging with the engaging means provided on the terminal electrode and both ends of the insulator. It is characterized by.

In the surge absorbing element manufactured by such a manufacturing method, the gap between the spark gaps is reduced by fitting a terminal electrode having an extension of a predetermined length to the opposite end of the insulator of a predetermined length. It is characterized by being specified.

Further, the form of the insulator and the terminal electrode is such that the insulator has a rectangular flat plate shape, the extension of the terminal electrode follows the flat plate of the insulator, and the flange extends in a direction substantially perpendicular to the extending direction. It is characterized in that it is formed on the terminal electrode, or that an engaging means is provided between the terminal electrode and both ends of the insulator.

[0013]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing the embodiment of the present invention with a part cut away, FIG. 2 is a longitudinal sectional view of the embodiment of the present invention, and FIG. FIG. 4 is an exploded perspective view showing components, and FIG. 4 is an exploded perspective view of a main part of the embodiment.

Reference numeral 1 denotes a surge absorbing element. The surge absorbing element 1 includes a discharge part 2 formed by fitting terminal electrodes 21 to both ends of a rectangular insulator 20 in the longitudinal direction. The glass tube 3 is open at both ends, and a dumet wire (copper-coated iron-nickel alloy wire) 4 as a metal for sealing the glass is inserted from the outside into the openings 30 at both ends. A lead wire 5 for connecting an external circuit is attached to the dumet wire 4 by spot welding or the like. The glass tube 3 in which the discharge part 2 is assembled and placed as described above is filled with an inert gas or the like, and the vicinity of the opening 30 is heated and fused with the dumet wire 4 to be sealed. .

It should be noted that assembling of the surge absorbing element 1 described above,
And the manufacturing method are disclosed in Japanese Utility Model Application No.
No. 111793 and Japanese Patent Application Laid-Open No. 9-171881 have already been disclosed, and a detailed description thereof will be omitted.

The main part of the present application is the discharge unit 2 of the above configuration.
Configuration and assembling method. By the way, in the surge absorbing element 1 having the above configuration, a discharge phenomenon occurs between the extended distal ends 21t of the terminal electrodes 21 (hereinafter, abbreviated as "spark gap S"). The smaller the spark gap S, the lower the firing voltage, and the larger the spark gap S, the higher the firing voltage. Therefore, depending on the setting of the spark gap S, the discharge starting voltage can be appropriately changed.

In the discharge unit 2 of the present embodiment, a ceramic dielectric such as alumina, mullite, steatite, or an insulator 20 made of glass or the like is formed in a rectangular flat plate shape. The terminal electrodes 21 and 21 are gripped and fitted.

The terminal electrode 21 is formed of a resilient conductive material such as a metal plate, and has a disk-shaped flange 21f substantially conforming to the inner diameter of the glass tube 3, and has one side ( An extension 21e extending in the form of a tongue opposing from the upper and lower middle portions (in the drawing) is integrally formed. The terminal electrode 21 is fitted by fitting the flange 21f until the flange 20f contacts the end 20e of the insulator 20, and is fixed by gripping the end 20e with the two vertically extending extensions 21e, 21e.

With such a combination, the spark gap S is determined by the distance between the both ends 20 e of the insulator 20 (hereinafter, referred to as the distance).
Abbreviated as “insulation distance B”. ) Is subtracted from the distance from the flange 21f to the tip 21t of the extension 21e of the terminal electrode 21 (hereinafter, abbreviated as “extension distance E”). That is, since the spark gap S = (B−2E), the insulation distance B and the extension distance E
Can be set freely, and as a result, a desired discharge starting voltage can be set.

With the above configuration, the position of the terminal electrode 21 in the surge absorbing element 1 can be set by fitting the flange 21f so that the width of the flange 21f (Y direction in the drawing) matches the width of the end 20e of the insulator 20. , And the position on the Y axis is specified, and the position on the Z axis is specified because the insulator 20 is flat. In addition, since the extension 21e with respect to the flange 21f is specified, the position on the X-axis is automatically specified by fitting the flange 21f so as to face the insulator 20.

As described above, the terminal electrode 21 having the predetermined size and shape is attached to the end 20e of the insulator 20 formed into the predetermined size and shape.
Are fitted to each other, so that the spark gap S (that is, the discharge starting voltage) and the X-axis
The positional relationship between the Y axis and the Z axis (that is, fixing of the discharge path) can be set easily and stably. In the discharge unit 2 thus configured, the flange 21f is formed so as to substantially coincide with the inner surface of the glass tube 3, so that if it is inserted as it is, the positional relationship in the glass tube 3 will be determined.

According to the embodiment of the present embodiment, it is possible to suppress the variation within ± 10% with respect to the surge absorbing element of the conventional configuration in which the discharge starting voltage varies from ± 30% to ± 40%. And the yield is more than 99%,
Stable products could be manufactured with high production efficiency.
In addition, the working process can be reduced by 30% to 40%, which can greatly contribute to cost reduction.

Next, another embodiment shown in FIG. 5 will be described. The discharge part 6 of the present embodiment is formed of two similar protrusions 60b as fitting means on the upper surface of the insulator 60 formed of the same material and the same rectangular flat plate as the insulator 20 of the above embodiment. , 60b facing each other with a predetermined separation distance. The terminal electrode 61 is formed in a substantially U-shape by removing the flange 21f from the terminal electrode 21 used in the discharge unit 2 of the above-described embodiment.
In the middle, a fitting concave portion 61h having an opening shape capable of fitting with the fitting convex portion 61 is formed.

With this configuration, the insulation distance B
Is set as the distance between the center of the fitting protrusions 60b and the extension distance E from the center of the fitting recess 61h to the tip 61t, the spark gap S becomes S = (B-2) in the same manner as described above.
E) can be obtained.

Further, since the terminal electrode 61 with respect to the insulator 60 is determined by fitting to the fitting convex portion 60b, the X of the discharge path
The position setting on the axis, the Y axis, and the Z axis is determined at a time.

[0027]

[Possibility of Other Embodiments] In the above embodiment, the planar shape of the distal end portion of the extension portion is formed as a single convex elliptical shape. Further, a plurality of convex shapes may be formed. Furthermore, although two extension portions are formed vertically with respect to the terminal electrodes, the extension portions may be arranged only on one side of the upper or lower side.

Further, it is preferable that the two terminal electrodes disposed opposite to the insulator are formed in the same manner. However, the present invention is not limited to this, and the number of protrusions of each extending portion is one on one side. So that the other side has a plurality,
It may be different.

Furthermore, the formation of the fitting projections and fitting recesses as the fitting means of the discharge portion 6 does not need to be circular,
For example, a configuration guided by a slit groove or the like may be used, and various configurations may be used as long as the configuration is suitable for positioning the insulator and the terminal electrode.

[0030]

According to the present invention, the positional relationship between the X-axis, the Y-axis, and the Z-axis of the discharge path can be obtained simply by fitting a terminal electrode of a specific shape to a standard-molded insulator. Can be set easily, easily and with high accuracy.

In addition, by selecting and combining insulators having various insulation distances and terminal electrodes having various extension distances to form spark gaps of various standards, discharge starting voltages of various standards are formed. This has the effect of being able to manufacture a surge absorbing element having

From these effects, it is possible to manufacture a surge absorbing element having stable performance without product variations, and to improve production efficiency and reduce production costs by reducing the number of production steps. It demonstrates its usefulness.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the embodiment with a part cut away.

FIG. 2 is a longitudinal sectional view of the embodiment.

FIG. 3 is an exploded perspective view showing components before assembly according to the embodiment.

FIG. 4 is an exploded perspective view of a main part of the embodiment.

FIG. 5 is an exploded perspective view of a main part of another embodiment.

FIG. 6 is a perspective view schematically showing a conventional configuration example.

[Explanation of symbols]

 Reference Signs List 1 surge absorbing element 2 discharge part 20 insulator 20e end 21 terminal electrode 21e extension 21t tip 21f flange 3 glass tube 30 open port 4 dumet wire 5 lead wire 6 discharge part 60 insulator 60b fitting protrusion 61 terminal Electrode 61e Extension 61h Fitting recess 61t Tip S Spark gap B Insulation distance E Extension distance

Claims (7)

[Claims] 1. A method for manufacturing a surge absorbing element, wherein a spark gap is formed between opposed terminal electrodes in a discharge space, wherein a terminal electrode having a predetermined length of extension is replaced with an insulator of a predetermined length. A method for manufacturing a surge absorbing element, characterized in that a gap between spark gaps is defined by fitting to a facing end of a surge absorbing element. 2. A method of manufacturing a surge absorbing element, wherein a spark gap is formed between opposed terminal electrodes in a discharge space, wherein any one of the terminal electrodes having extending portions set to various lengths is provided. A spark gap of various standards is manufactured by selecting one of insulators set to various lengths and fitting the insulator to the opposite end of the insulator. Manufacturing method of the absorption element. 3. An insulator is formed in a rectangular flat plate shape, and an extension of the terminal electrode is formed along the flat plate of the insulator, and a flange extending in a direction substantially perpendicular to the extending direction is formed in the terminal electrode. X-axis, Y-axis of the terminal electrode in the discharge space,
3. The method for manufacturing a surge absorbing element according to claim 1, wherein a positional relationship on the Z axis is set. 4. An X terminal of an opposing terminal electrode is engaged by engaging engagement means provided on terminal electrodes and both ends of an insulator.
3. The method for manufacturing a surge absorbing element according to claim 1, wherein a positional relationship on an axis, a Y axis, and a Z axis is set. 5. A surge absorbing element in which a spark gap is formed between terminal electrodes facing each other in a discharge space, wherein a terminal electrode having an extension of a predetermined length is connected to an opposite end of an insulator of a predetermined length. A spark absorbing element, wherein a gap of a spark gap is defined by fitting the spark absorbing element into a part. 6. An insulator having a rectangular flat plate shape, wherein an extension of the terminal electrode extends along the flat plate of the insulator, and a flange extending substantially perpendicular to the extending direction is formed on the terminal electrode. The surge absorbing element according to claim 5, wherein: 7. The surge absorbing element according to claim 5, wherein engagement means is provided at the terminal electrode and at both ends of the insulator.