JPH0236247Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a lightning arrester, in which a columnar element is housed and fixed within an insulator tube.

BACKGROUND ART A lightning arrester uses an element, and when a columnar element is used as the element, conventionally a zinc oxide element 1 as shown in FIG. 3 is housed and fixed in a porcelain tube.

FIG. 4 is a sectional view showing a state in which a columnar zinc oxide element 1 is housed in an insulator tube. A distance 4 is integrally fixed to a holding plate 3 that closes the lower part of the insulator tube 2, and a zinc oxide element 1 to which an upper electrode 8a and a lower electrode 8b are attached is placed on the distance 4. There is. Upper electrode 8a and lower electrode 8
b and the zinc oxide element 1 are ring-shaped insulating plates 5a.
and 5b are integrally connected by inserting four insulating rods 10 into mounting holes drilled at equal intervals near the outer circumference of the husband and by tightening insulating nuts 11. The zinc oxide element 1 placed on the distance 4 is supported by being sandwiched between the pressing member 9 and the distance 4. That is, the pressing member 9 has a projection 12 formed on the lower surface of the pressing plate 6.
It is slidably inserted through the presser plate 6 and is urged downward by a spring 7 interposed between the presser plate 6 and the pressing member 9. The distance 4 is in contact with the lower electrode 8b through the hole in the center of the insulating plate 5b, and the pressing member 9 is in contact with the upper electrode 8a through the hole in the center of the insulating plate 5a.

As described above, by providing the insulating plates 5a, 5b and the insulating rod 10, the zinc oxide element 1 is supported without shifting in the horizontal direction.

Problems to be Solved by the Invention However, since the device is supported using insulating rods, it has the disadvantage that the structure is complicated and it takes a lot of time to assemble.

Means for Solving the Problems The present invention has a cylindrical element with protrusions formed at both ends, and a recess into which one of the protrusions is fitted into the inner surface of a first presser that closes one opening of the insulator tube. A protruding portion is formed on the inner surface of the second presser foot that closes the other opening of the insulator tube, and the protruding portion and the other convex portion are fitted into the sleeve-shaped coupling tube to support the element. The element is electrically connected reliably by pressing the first electrode against one convex part and the second electrode against the other convex part via a spring. Features.

Function The element has one convex part fitted into the recess of the first presser, and the protrusion of the second presser and the other convex part of the element fitted into the coupling tube. Supported. On the other hand, electricity flows in the order of the second presser, the spring, the second electrode, the element, the first electrode, the spring, and the first presser.

Embodiments Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

In the present invention, the element is shaped as shown in FIG. 2 so that the element can be easily supported with a simple support structure. As shown in the figure, the element 15 has a cylindrical element body 1
5a and disk-shaped protrusions 15b and 15c formed at both ends of the element body 15a.

FIG. 1 shows a sectional view of a lightning arrester in which an element 15 having such a shape is housed and fixed in an insulator tube. As shown in the figure, a first presser 17 is attached to one opening of the generally cylindrical insulator tube 16. First presser foot 17
A cylindrical portion 17a is integrally formed on the inner surface of the element 15, and the inside of the cylindrical portion 17a is a recess 18 into which one of the protrusions of the element 15 is fitted. A first electrode 20 is provided in the recess 18 via a spring 19, and the first electrode 20 is pressed against the protrusion 15b. A second presser foot 21 is attached to the other opening of the insulator tube 16. A protrusion 21a having an outer diameter approximately equal to the outer diameter of the other protrusion 15c is integrally formed on the inner surface of the second presser foot 21, and the protrusion 21a and the other protrusion 15c of the element 15 are shaped like a sleeve. It is fitted into the coupling tube 22 of. That is, in the upper part of the element 15, movement of the element 15 in a direction perpendicular to the axis is restricted by the coupling tube 22. In this embodiment, a spring 23 is provided between the coupling tube 22 and the second presser 21 so as to surround the protrusion 21a. A second electrode 25 is provided inside the coupling tube 22 at the tip of the protrusion 21a via a spring 24, and the second electrode 25 is pressed against the protrusion 15c.

In the present invention, electricity flows in the order of the second presser 21, the protrusion 21a, the spring 24, the second electrode 25, the protrusion 15c, the element body 15a, the protrusion 15b, the first electrode 20, the spring 19, and the first presser 17. The end surfaces 15 of the convex portions 15b and 15c
Electricity flows to the element 15 only through the end faces 15d and 15e, but in this embodiment, aluminum is thermally sprayed not only on the end faces 15d and 15e but also on the end faces 15f and 15g of the element body 15a, and electrodes are attached to the end faces 15d and 15e. The coupling tube 22 is pressed against the end face 15g, and the structure is such that electricity also flows from the end faces 15f and 15g.

The assembly of such a lightning arrester will be explained. To assemble the lightning arrester, insert the spring 1 into the recess 18.
9. After fitting the first electrode 20, press the first presser 1
7 to one opening of the insulator tube 16, and
5 into the insulator tube 16 and the convex portion 15b is fitted into the concave portion 18. Next, the coupling tube 22 is fitted into the protrusion 15c, the second electrode 25 and the spring 24 are placed inside the coupling tube 22, and the spring 23 is placed on the coupling tube 22, and then the protrusion 21a is inserted into the coupling tube 22. and attach the second presser foot 21 to the other opening of the insulator tube 16. Since there are no tightening parts such as nuts inside the insulator tube 16, assembly is easy and the assembly time is short.

Next, the flow of electricity will be explained. Second presser foot 2
1 to the element 15 through the protrusion 21a→spring 24→second electrode 25→end surface 15e and the spring 23→coupling tube 22→end surface 15g. In addition, from the element 15 to the first presser 17, the route of the end surface 15d→first electrode 20→spring 19→first presser 17 and the end surface 15f→cylindrical portion 17a→
It flows along the path of the first presser foot 17.

Effects of the Invention As explained above, according to the present invention, the element is formed into a shape in which convex portions are formed at both ends of the cylindrical element body, and the concave portions are fitted into the convex portions, so that the element can be inserted into the insulator tube. Since it is fixed, there is no need to use an insulating rod, resulting in a significant cost reduction. In addition, since the structure is simple, assembly is easy and the number of assembly steps is small.

[Brief explanation of the drawing]

1 and 2 relate to an embodiment of the lightning arrester according to the present invention, FIG. 1 is a sectional view of the lightning arrester, FIG. 2 is a perspective view of the element, and FIGS. 3 and 4 relate to a conventional lightning arrester. FIG. 3 is a perspective view of the element, and FIG. 4 is a sectional view of the lightning arrester. 15...Element, 15a...Element body, 15b,
15c... Convex portion, 16... Insulator tube, 17... First presser foot, 18... Concave portion, 19, 24... Spring,
20...First electrode, 21...Second presser foot, 22...
Coupling tube, 25... second electrode.

Claims (1)

[Scope of utility model registration request] a substantially cylindrical insulator tube; an element housed within the insulator tube having a cylindrical shape having convex portions at both ends; a concave portion for fitting one of the convex portions on the inner surface thereof; a first presser attached to cover one opening of the recess, a first electrode provided in the recess via a spring and pressed against one of the protrusions, and an outer diameter dimension of the other protrusion. A second presser is formed on the inner surface of the insulator tube and has a protrusion having an outer diameter approximately the same as that of the insulating tube. a coupling tube,
A lightning arrester comprising a second electrode that is provided at the tip of the protrusion via a spring and is pressed against the other protrusion.