JPH017966Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a molded cone for a lead wire with a built-in lightning arrester element provided in the main body insulator of a switch, cut-out switch, etc.

Prior Art Conventionally, in switches, cut-out switches, etc. that have lightning arresters, the lightning arrester has been arranged independently of other components such as the main body insulator. Therefore, a dedicated space is required, devices such as switches become larger, and lead wires must be routed between the lightning arrester and the main insulator, making the structure complicated. In addition, nothing is provided within the thick wall portion on the proximal end side of the mold cone, and this space is wasted.

Purpose of the invention The purpose of this invention is to solve the problems of the conventional technology, to reduce the size of the device even if it is equipped with a lightning arrester, to simplify the structure, and to make it easier to incorporate the lightning arrester. To provide a molded cone for a lead wire with a built-in surge arrester element that hardly requires any special structural changes.

Structure of the device In this device, a molded cone is provided at the outlet of the lead wire drawn out from the main insulator, and on the other hand, a lightning arrester element having a grounding side electrode and a charging side electrode is formed into a cylindrical shape, and the lightning arrester element is placed in the center of the lightning arrester element. A lightning arrester element is embedded in a thick portion on the proximal end side of the molded cone in a state where the lead wire is penetrated, and the charging side electrode is connected to the lead wire.

Embodiment A first embodiment of this invention, which is embodied in a bushing that passes through a switch, will be described below with reference to FIGS. 1 to 3. As shown in FIG. 1, a center hole 2 is formed through the axial center of the main body insulator 1 of the bushing, and internal pleats 3 and external pleats 4 are formed at one end, and a skirt portion is formed at the other end. 5 is formed. A conductive rod 6 is inserted and fixed into the center hole 2, and an external lead wire 7 is connected to one end of the conductive rod 6 within the internal pleats 3, and a connecting terminal 8 is provided within the skirt portion 5.

A rubber mold cone 9 is provided on the outer periphery of the conductive rod 6 and the external lead wire 7 so as to cover the outlet portion of the external lead wire 7 and the connecting portion between the external lead wire 7 and the conductive rod 6. A lightning arrester 10 is buried in the thick wall portion on the base end side. As shown in FIGS. 2 and 3, the lightning arrester 10 is a cylindrical non-linear resistor arranged so as to surround and insulate the connection between the conductive rod 6 and the external lead wire 7. Element 11 and one element 1
It is composed of a grounding side electrode 13 fixed to one end face and a charging side electrode 14 fixed to the other end face of the element 11, and the grounding side electrode 13 has a grounding wire 15.
is connected, and the charging side electrode is connected to the connecting wire 16.
It is connected to the conductive rod 6 via. In addition,
A small molded cone 17 that is integral with the rubber molded cone 9 is provided at the outlet of the ground wire from the rubber molded cone 9, and is disposed opposite to the external horn 21. Further, as shown in FIG. 2, both elements 11 include a resistor 18 made of zinc oxide.
, a silicon film 19 covering the outer periphery of the resistor 18 , and an insulating film 20 covering the outer periphery of the silicon film 19 .

As mentioned above, in this embodiment, the lightning arrester 1
0 is buried in the rubber mold cone 9 between the external lead wire 7 and the conductive rod 6, there is no need for a dedicated space for installing the lightning arrester, making it possible to downsize the entire switch. 10 and the external lead wire 7, which is required when they are separated from each other, there is no need to route the lead wire between them, and the configuration can be simplified. Furthermore, lightning arrester 1
0 is only buried in the rubber mold cone 9, the lightning arrester 10 can be buried and assembled at the same time as the rubber mold cone 9 is molded, and there is almost no need to make any changes to other components, and only a few changes can be made. Only the shape of the rubber mold cone 9 is slightly changed.

Second Embodiment Next, a second embodiment in which this invention is embodied in a cut-out switch will be described with reference to FIGS. 2 to 4. A current limiting fuse 33 is inserted into the center hole 32 of the main body insulator 31, and an external lead wire 35 connected to its external electrode 34 is led out through a through hole 36 on the side of the bushing. A rubber mold cone 37 is disposed to cover the outlet of the external lead wire 35, and a lightning arrester 38 is embedded in the thick part of the base end of the rubber mold cone 37.

As is clear from FIGS. 2 and 3, the lightning arrester 38 includes a grounding side electrode 40 and a charging side electrode 41 connected and fixed to the opposing end surfaces of an element 39 arranged so as to surround the external lead wire 35. As in the first embodiment, the ground electrode 40 is connected to the ground wire 43 disposed opposite the external horn 48 via a small molded cone 42 integrated with the rubber molded cone 37. The side electrode 41 is connected to the external lead wire 35 via a connecting wire 44 . Further, as is clear from FIGS. 2 and 3, the element 39 includes a resistor 45 made of zinc oxide as in the first embodiment, and
It is composed of a silicon film 46 and an insulating film 47 that cover the resistor 45.

As described above, in this second embodiment as well, the lightning arrester 38 having a substantially cylindrical cross section is connected to the external lead wire 35.
Since it is embedded in the rubber mold done 37 in a state in which the
There is no need to make structural changes to each component.

Effects of the invention As exemplified in the embodiments above, this invention provides the lightning arrester element in the thick part on the proximal end of the molded cone, which is a conventionally vacant space.
Space can be used effectively, and the device can be downsized and the configuration can be simplified. Moreover, since there is almost no need to make any changes to the main body insulator or other component parts, the conventional component parts can be used as they are, which is an excellent advantage.

[Brief explanation of the drawing]

Figures 1 to 3 show a first embodiment of this invention as a bushing for a switch.
FIG. 1 is an overall view of the bushing showing the main parts, FIG. 2 is a sectional view of the arrester element, and FIG. 3 is a perspective view of the same. FIG. 4 shows a second embodiment of this invention in a cut-out switch, and FIG. 4 is a partially cut-away front view of the cut-out switch showing the main part. Main body insulators 1, 31, external lead wires 7, 35, rubber mold cones 9, 37, lightning arresters 10, 38,
Elements 11 and 39, ground side electrodes 13 and 40, charging side electrodes 14 and 41, and ground wires 15 and 43.

Claims (1)

[Scope of claim for utility model registration] Lead wires 7 drawn out from the main insulators 1 and 31,
Mold cones 9, 37 are provided at the opening of 35, and on the other hand, the grounding side electrodes 13, 40 and the charging side electrode 1
The surge arrester elements 11, 39 having the lightning arrester elements 11, 39 are formed into a cylindrical shape, and the lightning arrester elements 11, 39 are formed with the lead wires 7, 35 passing through the center of the lightning arrester elements 11, 39.
is embedded in the thick wall portion on the proximal end side of the molded cones 9, 37, and the charging side electrodes 14, 41 are connected to the lead wires 7, 35. .