JPH07282952A - Lightning arrester - Google Patents

Abstract

(57) [Summary] [Structure] The discharge electrode 3 in which the discharge electrode portion 4 and the connection terminal portion 5 are integrally formed, the sealing electrode 8, and the concave groove 13 screwed with the connection terminal portion of the discharge electrode. The main electrode M formed by soldering the nut 11 having the inner cutout portion 14 is hermetically sealed in the insulating tubular container 1 so that the discharge surface 4 a of the discharge electrode facing the discharge electrode 4 has a predetermined discharge gap 16. The present invention relates to a lightning arrester A enclosed in a state. [Effect] The discharge electrode portion of the discharge electrode and the connection terminal portion are integrally formed, and the nut is provided with the concave groove and the inner notch so that the excess solder melted is absorbed by the concave groove and the inner notch. Therefore, it is possible to prevent the melted excess solder from flowing to the screw portion of the connection terminal portion outside the nut and filling the screw portion of this portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-filled gap type in which a discharge electrode electrically insulated from each other is provided in an insulating tubular container so as to face each other with a predetermined discharge gap therebetween in an airtight state. It concerns a lightning arrester.

[0002]

2. Description of the Related Art As a conventional gas-filled gap type lightning arrester, as shown in FIG.
A pair of discharge electrodes 43 are inserted into both end openings 42 of the discharge electrode 43 so that the discharge surfaces 44 of the discharge electrodes 43 facing each other have a predetermined discharge gap 45, and the outer peripheral edge portion 46 of the discharge electrode 43 is hermetically sealed. Open end 4 of tubular container 41 with solder s1
There is known a gap type lightning arrester A ′ which is attached to No. 7 and has an inert gas sealed inside. A connection terminal 48 made of tin-plated copper wire or the like is attached to the discharge electrode 43 of the lightning arrester A ′ by welding or the like for connection to another.

As another conventional gas-filled gap type arrester, as shown in FIG. 5 which is a vertical sectional view of the arrester and FIG. 6 which is an exploded view of a main electrode including a partial cross section, It is formed to have a thick thickness, and on one surface in the thickness direction,
It has a screw hole 51 in which a female screw is engraved in the substantially central portion thereof, and a thicker pedestal 52 provided in an outer circumferential portion around the screw hole 51, and the other surface A discharge electrode 50 having a discharge surface 55 having a plurality of holes 54 filled with an electrode active substance 53, and a through hole 61 at the center.
And has an outer peripheral end 62 that functions as a sealing portion.
The sealing electrode 60 in the shape of a plate is abutted so that the screw hole 51 of the discharge electrode 50 and the through hole 61 of the sealing electrode 60 are aligned with each other, and the abutting portion is fixed via solder s2 to form the main electrode. m, and such a main electrode m is attached to the discharge surface 55 of the discharge electrode 50 in the opening 71 at both ends of the insulating tubular container 70.
Of the sealing electrode 60, the outer peripheral end portion 62 of the sealing electrode 60 is hermetically attached to the opening end portion 71 of the tubular container 70 with the solder s3, and the inert gas is filled inside. Enclosed gas-filled arrester A "
It has been known. Then, one male screw 82 of the connection terminal 80 having male screws 82 and 83 engraved at both ends with the nut portion 81 sandwiched therebetween is screwed into the screw hole 51 formed in the center of the discharge electrode 50. A lightning arrester A ″ having a terminal in which a connection terminal 80 is attached to the discharge electrode 50 is known.

[0004]

Since the conventional lightning arrester A'as described above has a diameter of about 8 mm and a relatively small current withstand capability, a copper wire having a diameter of 1 mm is attached to the discharge electrode 43 by welding or the like. However, the diameter of the copper wire to be attached is about this diameter due to the relationship with the discharge electrode 43, and the current value that can be passed therethrough is small, so it cannot be used for large currents.

Further, the conventional lightning arrester A "as described above
Is, for example, a lightning arrester having a diameter of about 49 mm, which is a workable material that constitutes the main electrode m and which is made of an iron material capable of withstanding a thermal load, and a tubular container 70 whose coefficient of thermal expansion is approximately the same. Sealing electrode 6 made of an equivalent alloy material with iron, nickel and cobalt or an alloy material with iron and nickel
0 is a separate component and is joined by solder s2 to form the main electrode m. Further, the discharge electrode 50 is thick due to the current withstand capability, and the sealing electrode 60 is
It is thin because it is attached to the open end of the insulating tubular container 70 with solder s3. In this way, since the connection terminal 80 and the sealing electrode 60 are joined by the solder s4, and the discharge electrode 50 which is thick and heavy in weight is joined to the sealing electrode 60 by the solder s2, the solder s2 side When the flowability of the solder is poor and the solder does not completely reach the contact portion between the discharge electrode 50 and the sealing electrode 60, the connection terminal 80 is screwed into the screw hole 51 of the discharge electrode 50. Even if there is, the discharge electrode 5 causes thermal expansion and contraction due to repeated discharge.
There is a problem that 0 moves and short-circuits the narrow discharge gap 56.

An object of the present invention is to solve the problems of the above-mentioned conventional lightning arrester, and to provide a lightning arrester having high airtightness and high reliability.

[0007]

In order to achieve the above-mentioned object, the present invention provides a discharge electrode in which a discharge electrode portion and a connection terminal portion are integrally formed, a sealing electrode, and a connection terminal for the discharge electrode. A main electrode formed by soldering a nut having an inner groove and an inner groove to be screwed into the insulating tubular container so that the discharge surfaces of the discharge electrodes facing each other have a predetermined discharge gap. It is sealed in an airtight state.

Examples of the present invention will be described below, but the present invention is not limited to these examples as long as the gist of the present invention is not exceeded.

EXAMPLE FIG. 1 is a vertical sectional view of a lightning arrester of the present invention, and FIG. 2 is an enlarged sectional view showing a joining state of a discharge electrode of a lightning arrester, a sealing electrode and a nut, and a discharge electrode and a sealing electrode. Using FIG. 3, which is an exploded view including a partial cross section of the nut,
The lightning arrester of the present invention will be described.

A is a lightning arrester of the present invention, 1 is an insulating tubular container made of ceramic, glass or the like having openings 2 and 2 at both ends of a cylindrical shape, 3 is a discharge electrode, and a discharge The electrode 3 has a substantially disc-shaped discharge electrode portion 4 that forms a discharge, and a rod-shaped member that connects the lightning arrester A to another portion, which is erected at a substantially central portion of the discharge electrode portion 4 substantially vertically to the discharge electrode portion 4. And the connecting terminal portion 5 and the discharge electrode portion 4 and the connecting terminal portion 5 are integrally formed. As shown in FIG. 3, the surface of the discharge electrode portion 4 opposite to the connection terminal portion 5 is formed as a flat discharge surface 4a, and a plurality of discharge surface portions 4a are formed in the thickness direction. Hole 6 is drilled,
The hole 6 is filled with an electrode activation substance 7.

On the other hand, on the surface of the discharge electrode portion 4 on which the connection terminal portion 5 is arranged, the discharge electrode portion side small diameter portion 3a and the discharge electrode portion side small diameter portion 3 having a diameter smaller than that of the discharge electrode portion 4 are formed.
connection terminal side small diameter portion 3b having a diameter smaller than a
Is provided, and the above-mentioned connection terminal portion 5 is formed integrally with the discharge electrode portion 4 in the central portion of the connection terminal portion-side small diameter portion 3b. Further, the connection terminal portion 5 is provided with a screw portion 5a in which a screw is engraved over a predetermined length.

Reference numeral 8 denotes a sealing electrode. The sealing electrode 8 is formed by forming a plate-like body into a dish shape by pressing or the like, and has an outer surface bottom portion 8a and an inner surface bottom portion 8b. An insertion hole 9 is formed in the central portion of the dish-shaped sealing electrode 8, and a flat outer peripheral edge 10 functioning as a sealing portion is extended at the edge of the sealing electrode 8. There is.

Reference numeral 11 denotes a nut having an internal thread 11a formed on the inner peripheral surface thereof. A concave groove 13 is formed in the inner peripheral surface of the inner hole 12 of the nut 11, and the inner hole 12 of the inner hole 12 is formed. Inner notches 14 are provided at the corners of the circumferential surface. Furthermore,
Outer cutouts 15 are provided at the corners of the outer peripheral surface of the nut 11 corresponding to the inner cutouts 14.

The above described tubular container 1, discharge electrode 3, sealing electrode 8 and nut 11 constitute a lightning arrester A of the present invention. The assembly of such components, that is, the tubular container 1, the discharge electrode 3, the sealing electrode 8 and the nut 11 will be described below.

First, a ring-shaped solder material (not shown) is attached to the small diameter portion 3b of the discharge electrode 3 on the connection terminal side,
Next, the insertion hole 9 of the sealing electrode 8 is inserted into the connection terminal portion 5 of the discharge electrode 3 from the outer surface bottom portion 8a side of the sealing electrode 8.
Further, a ring-shaped solder material (not shown) is attached to the outer cutout portion 15 of the nut 11, and the concave groove 1 of the nut 11 is further mounted.
3 is provided with a solder material, a nut 11 is screwed into the screw portion 5a of the connection terminal portion 5 of the discharge electrode 3, and the sealing electrode 8 is fastened to the discharge electrode 3 with the nut 11 to temporarily fix it. In this way, by heating the discharge electrode 3, the sealing electrode 8 and the nut 11 assembled through the solder material, the solder material is melted and the discharge electrode 3, the sealing electrode 8 and the nut 11 are soldered. Thus, the integrated main electrode M is formed.

Main electrode M formed as described above
To the opening 2 at both ends of the insulating tubular container 1 and the discharge electrode 3
Of the sealing electrode 8 are attached to the open end portion 2a of the tubular container 1 with the solder S in an airtight state, and the discharge surface 4a of Assemble the lightning arrester A in which active gas is enclosed.

Next, the soldering state of the discharge electrode 3, the sealing electrode 8 and the nut 11 will be described in detail with reference to FIG.
In addition, in FIG. 2, the hatched lines on the joint surfaces of the discharge electrode 3, the sealing electrode 8 and the nut 11 indicate the joint portion by soldering.

The discharge electrode 3 and the sealing electrode 8 are the discharge electrode 3
The solder material arranged in the small diameter portion 3b on the connection terminal portion side is melted by heat, and a sufficient amount of melted solder that joins the entire contact surfaces of the discharge electrode 3 and the sealing electrode 8 flows and is soldered. In this way, the discharge electrode 3 and the sealing electrode 8 are soldered and joined, but when a large amount of molten solder is present, the excess molten solder is surrounded by the outer surface bottom portion 8a of the sealing electrode 8. It flows into the entire small diameter portion 3b on the side of the connection terminal portion, collects excess solder, and enhances the adhesion between the discharge electrode 3 and the sealing electrode 8.

As described above, the bottom 8 of the inner surface of the sealing electrode 8
The solder material is also attached to the joint between the peripheral portion of the insertion hole 9 of b and the nut 11 and the concave groove 13 of the nut 11.
The solder material in the groove 13 is the screw portion 5a of the connection terminal portion 5.
And the female screw 11a of the nut 11 are strengthened, and the concave groove 13 of the nut 11 acts as a reservoir for the melted solder, and the excess melted solder prevents the connection terminal portion 5 outside the nut 11 from being melted. It is possible to prevent the screw portion 5a from flowing to the screw portion 5a and filling the screw portion 5a in this portion. Also,
Since the molten solder flows into the inner cutout 14 of the nut 11 and accumulates therein, excess melted solder can be absorbed also by the inner cutout 14, so that the excess melted solder outside the nut 11 can be absorbed. It is possible to prevent the connection terminal portion 5 from flowing to the screw portion 5a. Further, the solder accumulated in the inner notch 14 of the nut 11 improves the adhesion between the sealing electrode 8 and the nut 11, and the solder accumulated in the groove 13 of the nut 11 causes the nut 11
The adhesion between the connection terminal portion 5 and the connection terminal portion 5 is improved.

[0019]

Since the present invention is configured as described above, it has the following effects.

The discharge electrode portion of the discharge electrode and the connection terminal portion are integrally formed, and a concave groove and an inner cutout portion are provided in the nut so that excess molten solder is absorbed by the concave groove and the inner cutout portion. Therefore, it is possible to prevent the melted excess solder from flowing to the screw portion of the connection terminal portion outside the nut and filling the screw portion of this portion.

Since the concave groove and the inner cutout portion are provided in the nut and the molten solder is stored in the concave groove and the inner cutout portion, the adhesion between the sealing electrode and the nut and the connection terminal portion between the nut and the discharge electrode is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a lightning arrester of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a joined state of a discharge electrode, a sealing electrode and a nut which constitute the lightning arrester of the present invention.

FIG. 3 is an exploded view including a partial cross section of a discharge electrode, a sealing electrode, and a nut that form the lightning arrester of the present invention.

FIG. 4 is a front view including a partial cross section of a conventional lightning arrester.

FIG. 5 is a vertical sectional view of a conventional lightning arrester, similar to FIG.

FIG. 6 is an exploded view including a partial cross section of a discharge electrode, a sealing electrode and a nut of a conventional lightning arrester.

[Explanation of reference symbols] A ... ・ Lightning arrester M ・ ・ ・ ・ ・ ・ ・ Main electrode 1 ・ ・ ・ ・ ・ ・ ・ ・ ・ Tubular container 3 ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Discharge electrode 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Discharge electrode part 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Connection terminal part 8 ・ ・ ・ ・ ・ ・・ ・ Seal electrode 11 ・ ・ ・ ・ ・ ・ Nut 13 ・ ・ ・ ・ ・ ・ Recessed groove 14 ・ ・ ・ ・ ・ ・ Inner notch

Claims (1)

[Claims] 1. A soldering method comprising: a discharge electrode in which a discharge electrode portion and a connection terminal portion are integrally formed; a sealing electrode; and a nut having a concave groove and an inner cutout portion to be screwed into the connection terminal portion of the discharge electrode. A lightning arrester, characterized in that the main electrodes formed by attaching are sealed in an airtight state in an insulating tubular container so that the discharge surfaces of the opposing discharge electrodes have a predetermined discharge gap.