JPH0241833Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a lightning arrester, and in particular increases the strength of the lower part of the arrester and reduces the weight of the upper part to improve seismic performance.

BACKGROUND ART A lightning arrester is generally used by connecting a plurality of insulator tubes containing elements such as non-linear resistors, and fixing the lowest insulator tube to a base installed on the ground, for example. These insulator tubes or the insulator tube and the base are connected through joints.

There are various types of joints, but spinning joints and flange joints are two types of joints that can be easily attached by surrounding the end of an insulator pipe. less than,
A lightning arrester using these joints will be explained. In addition,
A description of the elements housed within the insulator tube will be omitted.

FIG. 2 is an external view of a lightning arrester using a spinning joint, and FIGS. 3a, b, and c are structural views thereof. In FIG. 2, 1a and 1b are insulator tubes, 2a to 2d are spinning joints, 3 is a base, and 4 and 5 are terminals. As shown in FIGS. 3a to 3c, the spinning joints 2a to 2d are provided at the ends of the insulator tubes 1a and 1b via gaskets 6, and are airtightly crimped to the large diameter portions 7 of the insulator tubes by squeezing or the like. Lid 8
Then, after covering the large diameter part 7 of the insulator pipe from the outside of the tray-shaped cap 9 and the lower cover 8, the bolt 10 and nut 1 are inserted.
A fastening fitting 11 that is tightened and fixed to the large diameter portion 7 via the cap 6 and fixed to the cap 9 via a plurality of bolts; and a pressure release plate 13 that closes the pressure release hole 12. The spinning joints 2b and 2c are connected by a bolt 14 and a nut 15, and the spinning joint 2d and the base 3 are connected by a bolt 18 and a nut 19 via an insulating seat 17. Further, the terminal 5 is fixed to the cap 9 via a bolt 20 and a nut 21.

Next, a lightning arrester using a flange joint will be explained. The external view of such a lightning arrester is omitted since the joint in FIG. 2 is only changed, and the structure of the flange joint will be explained. As shown in FIG. 4, the flange joint 22 includes a flange 24 fixed to the insulator pipe 1c via cement 23, a first holding plate 27 attached to the flange 24 with bolts 26 via a gasket 25, and a gasket 28. A second presser plate 30 is attached to the first presser plate 27 with bolts 29 through the cap, a cap 33 is provided with a pressure relief plate 32 in the pressure relief port 31, and a cap is attached to the flange 24 with bolts 34 via the cap 33. The second press plate 30 has a plurality of holes 35 formed in its center. A terminal 37 is fixed to the flange joint 22 via a bolt 36, and the flange joint 22 is fixed to a base 39 via an insulating seat 38 by the bolt 34. In addition, since the flange joints are connected to each other in the connection portion between the insulator pipes in the same manner as in FIG. 3b, drawings and explanations will be omitted.

Problems to be solved by the invention However, these lightning arresters using only spinning joints or only flange joints have the following problems.

(a) Surge arresters using only spinning joints have a simple structure and are therefore lightweight and inexpensive, but their earthquake resistance is low.

(b) Surge arresters using only flange joints have great earthquake resistance and are robust, but they are heavy and expensive.

Therefore, an object of the present invention is to provide a lightning arrester that solves this problem.

Means for solving the problem Conventionally, it was common sense to construct a lightning arrester using only one type of joint, but the present invention uses a combination of different joints, and it It is characterized by using a robust flange joint only for the lowest joint where the pressure is applied, and using lightweight spinning joints for the other parts.

Function In this invention, a robust flange joint is placed at the bottom, and lightweight spinning joints are used for all other joints, so the arrester as a whole has sufficient earthquake resistance. Furthermore, since the expensive flange joint is arranged only at the bottom stage, the cost of the entire lightning arrester is also low.

Embodiments Hereinafter, the present invention will be explained based on embodiments shown in the drawings. The present invention is a most rational combination of the above-mentioned spinning joint and flange joint, and since the structures of these joints have already been described, only the overall structure of the lightning arrester will be described.

Figure 1 shows an external view of the lightning arrester according to the present invention.
In the figure, 2a to 2c are spinning joints, and only the lowest joint is a flange joint 22. In other words, above the spinning joint 2c is the second
Since this is the same as the lightning arrester shown in the figure, and the lowermost joint is a flange joint 22, an insulator tube 1c without a large diameter portion is used as the lower insulator tube (see FIG. 4).
The terminal 37 is connected to the flange joint 22 as described above, and the flange joint 22 is fixed on the base 39. In addition, the top spinning joint 2
Terminal 4 is connected to a.

The lightning arrester according to the present invention uses a flange joint as the lowest joint that requires strength against bending moments, so the earthquake resistance is improved and the cost is relatively low.

Effects of the invention As explained above, in this invention, a robust flange joint is used only for the bottom joint, which is subject to a large bending moment, and lightweight spinning joints are used for the other joints, so it is possible to This improves the earthquake resistance of the lightning arrester as a whole. Moreover, the expensive flange joint is used only at the bottom stage, and the other multiple joints use low-cost spinning joints, so the cost of the lightning arrester is also low. In addition, since only the combination of joints is changed, previously used parts can be used as is.

[Brief explanation of the drawing]

Figure 1 is an external view showing an embodiment of the lightning arrester according to the present invention, Figures 2 to 4 are related to conventional lightning arresters, Figure 2 is an external view of a lightning arrester using only a spinning joint, and Figure 3a is an external view of a lightning arrester using only a spinning joint. FIG. 3b is a sectional view showing the vicinity of the spinning joint at the bottom of FIG. 2, FIG. A sectional view taken along the line A-A, and FIG. 4 is a sectional view showing the vicinity of the flange joint. 1a, 1c...Insulator pipe, 2a, 2b, 2c...Spinning joint, 22...Flanged joint, 39...
base.

Claims (1)

[Scope of utility model registration request] A lightning arrester in which the insulating tubes are vertically stacked and connected by attaching joints to both ends of the insulating tubes housing the elements and connecting the joints to each other, and the lowest joint is connected to a base installed on the ground. A lightning arrester characterized in that a flange joint is used as the lower joint, and a spinning joint is used as the other joint.