JP2003297607A - Arrester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an arrester wherein its manufacture is made easy and its manufacturing cost is made low. <P>SOLUTION: After providing at an equal space around laminated zinc oxide elements a plurality of FRP rods 14, having respectively protruding portions 14a at both their ends, metal caps 15, 16 are contacted with the zinc oxide elements 13 so as to compress the elements 13 and the rods 14 which are present between the caps 15, 16. In this state, by subjecting the caps 15, 16 to a spinning seal work of a drawing work, the outer peripheral portions of the caps 15, 16 are coupled to the plurality of protruding portions 14a so that the caps 15, 16 embrace the protruding portions 14a, and a polymer casing 18 is molded around the zinc oxide elements 13 and the FRP rods 14. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning arrester that is easy to manufacture, has a low manufacturing cost, and can automate the manufacturing process.

[0002]

2. Description of the Related Art The structure of a polymer type lightning arrester of Conventional Example 1 is shown in FIG. As shown in the figure, a plurality of zinc oxide elements 3 are laminated between a pair of electrodes 1 and 2, a disc spring 4 is interposed, and a compressive force is applied between the pair of electrodes 1 and 2, 2 and the outer peripheral surface of the zinc oxide element 3 and further the electrodes 1,
The FRP pipe 5 is formed by winding a prepreg sheet or a prepreg tape in which fibers are impregnated with a liquid resin into the outer peripheral grooves 1a and 2a formed in 2 and curing the prepreg sheet. A lightning arrester is configured by attaching the jacket 6.

FIG. 5 (a) shows another structure of the polymer type lightning arrester of Conventional Example 2, which does not use a prepreg sheet or the like. As shown in the figure, a plurality of zinc oxide elements 3 are laminated between a pair of electrodes 8, a disc spring 4 is interposed, and the disc spring 4 is compressed.
Attach the FRP pipe 9 covering the
A lightning arrester is configured by attaching a polymer jacket 6 to the outer circumference of the FRP pipe 9. As shown in FIG. 5B, a knurled portion 8a having an uneven portion is formed in the portion to which the electrode 8 is bonded. Although 11 is a space, when the FRP pipe 9 having a hole or made of mesh is used, the space 11 is molded with rubber.

[0004]

However, in the polymer type lightning arrester of Conventional Example 1, the cost is high because the outer peripheral groove is formed in the electrode. Further, not only it takes time to wind the prepreg sheet around the outer peripheral groove, but also the winding process becomes complicated, which makes automation of manufacturing difficult. Furthermore, it takes time to cure the prepreg sheet.

In the polymer type arrester of Conventional Example 2, the cost of the electrode is high because the knurling is performed, and not only the FRP pipe is expensive, but it also takes time to bond the FRP pipe to the electrode. Further, when the external dimensions of the zinc oxide element change, an FRP pipe corresponding to the external dimensions is required.

In addition, as a common problem between the conventional examples 1 and 2, it is necessary to increase the bonding area in order to increase the bonding strength at the electrode portion, and as a result, the total length of the electrode becomes long and The total length becomes longer.

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

[0008]

To achieve the above object, the structure of the invention according to claim 1 is such that it is long in the stacking direction around the stacked zinc oxide elements and at least on the outer peripheral side of both ends. A plurality of insulating rods having protrusions are arranged at substantially equal intervals, and the outer peripheral portion of the metal lid that is in contact with both ends of the stacked zinc oxide elements is drawn and engaged with the protrusions to form a stack. An insulating porcelain tube surrounding the formed zinc oxide element is provided.

[0009] Zinc oxide elements are laminated, insulating rods are arranged around the laminated zinc oxide elements, the lids are brought into contact with both ends of the laminated zinc oxide elements, and the lid is drawn to form a lid. Are engaged with the protrusions, and finally an insulator tube surrounding the zinc oxide element is provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a lightning arrester according to the present invention will be described below.

(A) Embodiment 1 First, the first embodiment is shown in FIG.

As shown, stacked zinc oxide elements 13
Multiple FRP rods (insulating rods) at equal intervals around the
14 is arranged, and the upper and lower lids 15 and 16 restrain the FRP rod 14 from above and below. FRP rod 14
Is formed of glass fiber reinforced epoxy resin in the present embodiment, and the number of FRP rods 14 is determined according to the outer dimensions of the zinc oxide element 13, the required strength, and the like.

The FRP rod 14 has protrusions 14a at both ends.
To have a U-shaped cross section.

A disc spring 17 is attached to the stacked zinc oxide elements 13.
The metal lids 15 and 16 are brought into contact with each other via the
With the space between 6 compressed, the lids 15 and 16 are subjected to a drawing process called a spinning seal process.
The outer peripheral part of the device is in a state of being clung to (engaged with) the plurality of protrusions 14a, and the zinc oxide element 13, the plurality of FRP rods 14, and the lids 15 and 16 are integrally coupled via the disc spring 17. .

The outside of the zinc oxide element 13 and the FRP rod 14 is molded with a polymer jacket (insulator tube) 18.

In such a lightning arrester, when the lightning arrester releases pressure, the pressure is released from between the FRP rods 14.

(B) Second Embodiment Next, a second embodiment is shown in FIG. The second embodiment is a modification of the first embodiment.

In the second embodiment, instead of the protrusion 14a, grooves 14b are provided at both ends of the FRP rod 14, respectively. If the FRP rod 14 is long,
The groove 14b is also formed in the middle portion. The side of the FRP rod 14 in contact with the zinc oxide element 13 is the zinc oxide element 1
3 is formed in an arc shape so that the entire outer peripheral surface of the FRP rod 3 comes into contact with the inner surface of the FRP rod 14 and the zinc oxide element 13
Contact with the outer peripheral surface without gap. A ring 19 made of FRP or metal is fitted in the groove 14b. With the ring 19 fitted, the metallic lids 15 and 16 are attached by spinning seal processing in the same manner as described above. In this case, the outer peripheral portions of the lids 15 and 16 are clung to the ring 19. Zinc oxide element 13
The outer side of the FRP rod 14 and the FRP rod 14 are molded with a polymer jacket as in the first embodiment, but not shown.

Compared to the first embodiment, the ring is required, but on the other hand, there is an advantage that the insulating rod can be easily manufactured and the material is not wasted.

Since the other structure and operation are the same as those of the first embodiment, the description thereof will be omitted.

(C) Third Embodiment Finally, a third embodiment is shown in FIG. This Embodiment 3
Is a modification of the second embodiment.

As shown in the figure, a pair of flange portions 23 and 24 are provided, and the upper and lower rings 19 are fitted to the spigots 23a and 24a. And the upper and lower lids 21, 22
Bolts 25 penetrating the outer periphery of the flanges 23, 24
The lids 21 and 22 are attached by screwing into. The outsides of the zinc oxide element 13 and the FRP rod 14 are molded with a polymer jacket as in the first embodiment, but are not shown.

The other structure and operation are the same as those of the second embodiment, and therefore the description thereof will be omitted.

In the third embodiment, the flange is attached to the groove portion via the ring, but the flange may be directly attached to the groove portion. In addition, the shape of the inner surface of the insulating rod is the planar shape in the first embodiment,
Although the second and third embodiments have an arcuate shape, they may be reversed.

[0025]

As is apparent from the above description, claim 1
According to the lightning arresters according to 3 to 3, since the lid and the insulating rod are connected by the drawing process, the step for hardening the resin, which is conventionally required, is unnecessary. Further, since the connection between the insulating rod and the zinc oxide element is not a connection by adhesion unlike the conventional connection between the FRP pipe and the electrode, it is not necessary to lengthen the electrode in order to increase the adhesive strength,
The overall length of the arrester can be reduced. Further, even when zinc oxide elements having different outer dimensions are used, this can be dealt with by simply increasing or decreasing the number of insulating rods. Furthermore, since the lid is easily press-molded, the cost can be easily reduced.

According to the lightning arrester according to the fourth aspect, since the lid and the insulating rod are coupled by screw coupling, not only the coupling strength is large, but also the step for curing the resin which is conventionally required is unnecessary. Further, even when zinc oxide elements having different outer dimensions are used, this can be dealt with simply by increasing or decreasing the number of insulating rods.

[Brief description of drawings]

1 relates to a first embodiment of a lightning arrester according to the present invention,
(A) is a plan view and (b) is a front sectional view.

FIG. 2 relates to a second embodiment of a lightning arrester according to the present invention,
(A) is an AA arrow view of (b), (b) is a front sectional view.

FIG. 3 relates to a third embodiment of a lightning arrester according to the present invention,
(A) is a BB arrow line view of (b), (b) is a front sectional view.

FIG. 4 is a cross-sectional view of a lightning arrester according to Conventional Example 1.

FIG. 5 relates to a lightning arrester of Conventional Example 2, (a) is a sectional view,
(B) is a front view of the electrode.

[Explanation of symbols]

13 ... Zinc oxide element 14 ... Insulating rod 14a, 14b ... Projection 15, 16 ... Lid 18 ... Polymer jacket

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shizuo Mizuguchi             2-17 Osaki, Shinagawa-ku, Tokyo Stock market             Shameidensha F-term (reference) 5E034 EA07 EB01 EC01

Claims (4)

[Claims] 1. A laminated zinc oxide element in which a plurality of insulating rods, which are long in the laminating direction and have projecting portions on the outer peripheral sides of at least both ends, are arranged at substantially equal intervals around the laminated zinc oxide element. A lightning arrester characterized in that an insulating porcelain tube surrounding the stacked zinc oxide elements is provided by drawing an outer peripheral portion of a metal lid brought into contact with both ends of the lid and engaging the protruding portion. 2. The lightning arrester according to claim 1, wherein the protrusion is formed integrally with the insulating rod. 3. The lightning arrester according to claim 1, wherein each of the insulating rods is provided with a groove, and a ring for bundling the insulating rods is fitted into the groove so that the ring serves as the protruding portion. . 4. A plurality of insulating rods, which are long in the stacking direction, are arranged at substantially equal intervals around the stacked zinc oxide elements,
Grooves are provided on the insulating rods respectively, flanges for bundling the insulating rods are provided by fitting the grooves, and an outer peripheral portion of a metal lid abutted on both end surfaces of the stacked zinc oxide elements is provided on the flanges. A lightning arrester characterized by having an insulating porcelain tube surrounding a stacked zinc oxide element that is screwed together.