JPH0117833Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lightning arrester, and more particularly to a lightning arrester with an improved grounding terminal structure.

FIG. 1 and FIG. 2 show the conventional grounding terminal structure of a lightning arrester. In FIGS. 1 and 2, an internal element 2 is housed in a cylindrical grounding container 1, and a low voltage side of the internal element 2 is connected to a grounding terminal 3.

The grounding terminal 3 is attached to a current-carrying conductor 3a connected to the internal element 2, an insulator 3b molding the current-carrying conductor 3a, and a lower end opening 10 of the cylindrical earthing container 1, and having a diameter approximately the same as that of the opening 20. It is composed of a lid 4 having an opening 20a and a reinforcing member 3c that strengthens the adhesion between the lid 4 and the insulator 3b. In general, the grounding terminal 3 was manufactured by casting. For this reason, as shown in FIGS. 1 and 2, if the diameters of the internal element 2 and the lightning arrester 10 are different, there is a problem that the casting mold for production must be changed each time according to the difference in shape. Also, since most of the weight of the internal element 2 is directly supported by the insulator 3b due to its structure, it is necessary to increase the wall thickness or to strengthen the overall structure of the ground terminal 3 from the viewpoint of strength. must,
There were also economic problems.

The present invention was developed in view of the above-mentioned problems. Even if the internal elements and arrester diameters differ, the shape of the main part of the grounding terminal does not need to be changed significantly, and all ratings can be easily accommodated, and the weight of the internal elements can be changed. It is an object of the present invention to provide an economical lightning arrester having a ground terminal structure that supports the ground in a relaxed manner and has reduced limitations on strength.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, an internal element 2 is housed within a cylindrical earthing container 1. As shown in FIG. The lower end of the grounded container 1 has an opening 10, and a lid 4 having an opening 10a having approximately the same diameter as the opening 10 is attached to the lower end surface.

The internal element 2 has an insulating cylindrical member 5 having an opening 11 at its lower end. This cylindrical member 5
is attached to the lower end surface of the lid 4 and placed on the upper surface of the cover plate 8 which has an opening 11a within the range of the opening 11.

A grounding terminal 3 that closes this opening 11a from the outside
Attach to the bottom surface of backing plate 8. The ground terminal 3 includes a current-carrying conductor 3a whose outer periphery is molded with an insulator 3b in the opening 11a. This current-carrying conductor is connected to the inner element 2 within the tubular member 5 via the spring 6.
Connect electrically to the low voltage side of the

A short circuit conductor 7 is attached to the above-mentioned spring 6,
Electricity is ensured between the internal element 2 and the current-carrying conductor 3a.

With the above configuration, the weight of the internal element 2 is received by the cover plate 8 via the cylindrical member 5, so the ground terminal 3
Only the repulsive force of the spring 6 is applied to the current-carrying conductor 3a, which makes it possible to support internal elements in a manner that alleviates their importance, thereby reducing restrictions on strength. Also, as shown in Fig. 4, even for internal elements with large diameters, only the size and diameter of the cover plate 8 and the cylindrical member 5 are changed, and the grounding terminal 3 is the same as shown in Fig. 3. Can be used.

Even when the internal elements shown in FIG. 5 are stacked in parallel, this can be easily handled by simply replacing the cover plate 8 as appropriate. Furthermore, since the current-carrying conductor 3a and the internal element 2 are connected within the insulating cylindrical member, insulation from the surroundings can be further improved.

As explained above, according to the present invention, even if the diameter, weight, or arrangement of the internal elements changes, or the diameter of the grounding container that houses the internal elements changes, the shape of the main part of the grounding terminal does not change significantly. , it is possible to provide an economical lightning arrester having a grounding terminal structure that can be easily adapted to all ratings, supports the weight of internal components in a relaxed manner, and has reduced strength limitations.

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional views of main parts showing the grounding terminal structure of a conventional lightning arrester, FIG. 3 is a longitudinal cross-sectional view of main parts showing the grounding terminal structure of a lightning arrester according to an embodiment of the present invention, and FIG. 1 and 5 are longitudinal sectional views of essential parts showing the structure of the grounding terminal of a lightning arrester according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Earthing container, 2... Internal element, 3... Grounding terminal, 3a... Current-carrying conductor, 3b... Insulator, 5...
... Insulating cylindrical member, 6 ... Spring, 7 ... Short circuit conductor, 8 ... Cover plate.

Claims (1)

[Claims for Utility Model Registration] 1. An internal element is housed within a grounded first cylindrical member having a first opening at least at the lower end, and an insulating second member having at least a second opening at the lower end. placing the internal element on the upper end surface of the second cylindrical member;
The second cylindrical member has a third opening in the second opening, and the second
In the lightning arrester in which the lower end surface of a cylindrical member is placed and the third opening is closed by a grounding terminal, the outer circumference of the grounding terminal is molded with an insulating material at least outside the third opening. A lightning arrester comprising a current-carrying conductor, the current-carrying conductor being electrically connected to the internal element within the second cylindrical member via a buffer member. 2. The lightning arrester according to claim 1, wherein the buffer member is provided with a shorting conductor that electrically connects the internal element and the current-carrying conductor.