JP2000294085A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch having a scattering substance preventive plate admitting installation independent of other insulating plates even if a switch case is fitted internally with a lighting arrester for wirings, protections for earth or other short-circuiting, apparatus and elements for automation, etc., capable of reducing the number of component parts for cushions, etc., and also man-hours for mounting, and preventing the case body from becoming large. SOLUTION: Two parallel notches are provided in at least four places at the end of a scattering substance preventive plate 1 furnished with air holes 2 in approximately uniform distribution over the whole surface and the parts are folded in the same direction so that a cut-up part 3 is formed. At the same time, mounting seats 4 for internal element 7 are formed protrusively on the switch body at least in four places on the inside of the opening in the switch and the internal element 7 is fixed to the seats 4 by a bolt 6, and the plate 1 is abutted to the head of the bolt 6, and a lid 8 is closed in the condition that the cut-up part 3 is abutted to the inner surface of the lid 8 and the plate 1 is held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch for opening and closing and switching a distribution line, and more particularly, to a case where an internal short-circuit accident occurs in a pole-mounted switch disposed in an overhead distribution line, a destruction piece is moved to the outside of a case. The present invention relates to a structure for mounting a scattered object prevention plate of a switch provided with a scattered object prevention plate for preventing scattering.

[0002]

2. Description of the Related Art Conventionally, a switch housed in a case is hermetically closed to prevent the case body from exploding and breaking due to an abnormal increase in internal pressure when an accident such as an internal short circuit occurs. A pressure release section is provided between the section and the lid covering the opening, and the internal pressure is released by operating the pressure release section when the internal pressure rises. When the internal pressure is released, a wire mesh or a scattered thing prevention plate with a large number of ventilation holes is placed over the case opening to prevent the debris inside the case from scattering outside and harming the surrounding people. Provided.

As a technique for attaching these scattered matter prevention plates to a case, Japanese Utility Model Application Laid-Open No. 61-149246 discloses a cased switch. This means that, as shown in FIG. 6, an inward step 5 is continuously formed around the periphery of the case opening and the step 5 is formed.
Of a plurality of inter-phase insulating plates 17 disposed at right angles to the longitudinal direction of the step 5 on the inner surface of the stepped portion 5 and a scattered object prevention plate 19 having a large number of ventilation holes 21 is fitted. It is to attach.

As another method of attaching the scattered object preventing plate, as shown in FIG. 7, hemispherical bumped cushion members 23 are provided at the four corners on the upper surface of the scattered object preventing plate 22.
Further, as shown in FIG. 8 and FIG.
The scattered object prevention plate 22 is placed on the head of the fixing bolt 26 of the internal element 25 fixed to 4. Next, by covering the lid 27 as shown in FIG.
The scattered object prevention plate 22 is held and fixed by abutting and pressing against the scattered object 3.

[0005]

However, the former mounting structure of the scattered object preventing plate 19 is composed of a ground insulating plate (not shown) and an inter-phase insulating plate 17 provided inside the case body 1.
However, unless they are integrally fitted and fixed to the engagement grooves provided, the scattered object prevention plate 19 is not sufficiently fixed and held. Further, the inter-phase insulating plate 17 and the ground insulating plate are restricted by the mounting positions and mounting postures of the devices and elements to be mounted in the switch case main body 1 so that the inter-ground insulating plate 17 and the inter-phase insulating plate 17 are prevented from flying objects. It is difficult to integrally form the plate 19. Further, when the ground insulating plate or the inter-phase insulating plate 17 has to be provided avoiding these devices and elements, the size of the inter-phase or the inter-ground has to be increased, and the case body 1 becomes large. Become.

Further, there is a concern that the latter mounting structure of the scattered object prevention plate 22 has a large number of parts and may cause a simple trouble such as forgetting to attach the cushion material 23.
On the other hand, recent trends include effective lightning protection of distribution lines,
Various devices and elements, such as lightning proof elements, voltage detection capacitors, coupling capacitors for distribution line carrier signals, and power transformers for driving controllers, are installed in switchgear cases for the purpose of protection against ground short-circuit short-circuit and automation. Often attached to. FIG.
0 and FIG. 11 show an example thereof, where A in the figure is a lightning proof element.

Accordingly, the present invention has been made in view of the above circumstances and has been developed to prevent a scattered object preventing plate even if related devices and elements such as lightning protection of a distribution line, ground short-circuit protection, automation and the like are mounted in a switch case. However, it is possible to attach it independently of other insulating plates, reduce the number of parts such as cushioning material and the number of man-hours for installation work, and also suppress the enlargement of the case body The challenge was to provide

[0008]

SUMMARY OF THE INVENTION According to the present invention, a pressure release portion is provided at the time of internal pressure rise by covering a lid via a packing at a opening of a case body accommodating an opening / closing contact and the opening / closing mechanism and sealing it with a predetermined force. And a switch provided with a scattered object prevention plate having a ventilation portion formed on substantially the entire surface inside the opening, and at least four positions inside the opening are provided with support portions protruding from the switch body. At least four parallel cuts are formed at least at four ends of the scattered object prevention plate, and the portions between the cuts are bent to the same side to form cut-and-raised portions, and then, The cover is covered with the cut-and-raised portion abutting against the inner surface of the lid, with the scattered object prevention plate abutting on the support portion with the opposite surface of the cut-and-raised portion inside.

In the case where an internal element whose one end is fixed by bolting is installed in the switch body, the head of the fixing bolt is disposed at the position of the support portion to prevent the scattered object from being scattered. Support portion. Further, a lightning-resistant element integrally coated with an insulating resin can be used as the internal element.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a flying object prevention plate, and FIG. 2 is an enlarged view of a main part of FIG. Shatterproof plate 1
Is formed by punching a metal plate of iron, stainless steel, aluminum or the like to form a large number of ventilation holes 2 as a ventilation portion, and bending both ends at a right angle to prevent displacement.
Further, a pair of parallel cuts are made at four positions near the ends in the longitudinal direction, and a portion sandwiched between the cuts is bent obliquely upward to form a cut-and-raised portion 3. In addition, the scattered object prevention plate 1 may be formed of an insulating plate having heat resistance and cushioning property such as a polyester glass mat.

FIG. 3 is a cross-sectional view of the state in which the scattered object prevention plate 1 of FIG. 1 is mounted in the switch body, as viewed from the front, and FIG. 4 is a cross-sectional view of the same, viewed from the side. As shown in both figures, a mounting seat 4 having an L-shaped cross-section and protruding from an inner peripheral portion in the vicinity of the longitudinal direction of the case opening is welded to the inner surface of the case main body 5, and a hexagon bolt 6 is attached to the mounting seat 4. Is inserted from above, and an internal element 7 such as a lightning proof element or a voltage detection capacitor element is fixed in the vertical direction.

On the other hand, the mounting seat 4 is similarly welded to the case main body 5 in the longitudinal direction of the opposite case opening, and a hexagonal bolt 6 is inserted into the mounting seat 4 from above, so that the inside of the lightning proof element or the voltage detecting capacitor element or the like. The element 7 is fixed in the vertical direction, and the flat portion of each hexagon bolt 6 is located on the same plane. The scattered object prevention plate 1 is connected to the internal element 7 of the mounting seat 4.
Are mounted on the flat portions of the hexagonal bolts 6 for fixing the cover, and the case opening is almost completely covered.
Abuts the inner periphery of the. That is, the flying object prevention plate 1
Are held between the flat portion of each hexagon bolt 6 and the peripheral portion inside the lid 8.

Next, the cover 8 is bolted to the case body 5 and attached with a predetermined force, so that
The cut-and-raised portion 3 is pressed and elastically deformed, and the scattered object prevention plate 1 is held by the case body 5 and stabilized by the restoring force. FIG. 5 shows a state in which the opening of the case main body 5 is covered with a lid 8, and the case body 5 is fixed using a fastening means such as a bolt (not shown) so as to be released when the internal pressure rises to a constant pressure.

Here, the lightning proof element, voltage detection capacitor, distribution line coupling signal coupling capacitor, and power supply transformer for driving the controller, which are mounted as internal elements, are integrally molded with terminals and mounting inserts using epoxy resin, and are extremely compact. In addition, a predetermined insulation performance is ensured, and assembly is easy. Thus, the ground insulating plate and the inter-phase insulating plate have less restrictions on the mounting positions and mounting postures of these devices and elements, so that it is not necessary to increase the inter-phase and inter-ground dimensions, and the size of the case body 5 can be suppressed from increasing. A mounting seat 4 protruding from an inner peripheral portion in the vicinity of the case opening longitudinal direction.
However, a strict dimensional tolerance is not particularly required unless the case body 5 is welded with an extreme step.

If the internal pressure rises abnormally after an accident such as an internal short circuit occurs after the switch is installed, the switch passes through a large number of air holes 2 formed in the scattered matter prevention plate 1 and has a cover. 8
, A pressure release mechanism (not shown) is operated, and a gap is generated between the case body 5 and the lid 8, and the high-pressure gas generated inside is released from the gap, and at the same time, the debris inside the case is However, it is prevented by the scattered object prevention plate 1 in front of the gap. In this way, even if a switch and other devices, such as lightning protection elements, voltage detection capacitors, and signal transmission coupling capacitors, tend to be densely mounted in the switch case and tend to be large, special fixing tools are also required. The scattered object prevention plate 1 can be attached very easily without any trouble, and can be sufficiently fixed and held inside the case main body 5 even when transporting the switch and mounting work.

Based on these facts, according to the present invention, even if devices and elements are mounted in the switch case, the scattered object preventing plate is sandwiched between the bolt head flat portion and the lid to which the devices and elements are fixed, and other devices are mounted. It can be attached independently of the insulating plate.
In addition to reducing the number of parts such as cushioning materials and improving the workability of assembly, there is no need to expand the space between the grounds or the ground, and it is not necessary to add a new mounting device for the flying object prevention plate. Larger size is also suppressed.

[0017]

As described above, according to the present invention, the inside of the scattered object prevention plate is supported in contact with the support portion on the switch body side, and the cut-and-raised portion is mounted on the outside cover. By being abutted and supported on the inner surface thereof, it is possible to reduce the number of parts and the number of assembling steps without requiring any special parts for mounting other than the scattered object prevention plate.

[Brief description of the drawings]

FIG. 1 is a perspective view of a flying object prevention plate according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a cross-sectional view of a state where the scattered object prevention plate of FIG. 1 is attached, as viewed from the front.

4 is a cross-sectional view of a state where the scattered object prevention plate of FIG.

FIG. 5 is a perspective view of the switch in the state of FIGS. 3 and 4;

FIG. 6 is a perspective view showing a conventional example.

FIG. 7 is a perspective view showing a conventional example.

FIG. 8 is a perspective view showing a conventional example.

FIG. 9 is a sectional view showing a conventional example.

FIG. 10 is a sectional view showing a conventional example.

FIG. 11 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shattering object prevention plate 2 Vent hole 3 Cut-and-raised part 4 Mounting seat 5 Case body 6 Hex bolt 7 Internal element 8 Lid

Claims (3)

[Claims] 1. A pressure relief portion for raising internal pressure is formed by covering a lid through an opening in a case body accommodating an on-off contact and an on-off mechanism portion thereof through packing and sealing with a predetermined force. In a switch provided with a scattered object prevention plate having a ventilation portion inside the opening, at least four positions inside the opening are provided with support portions protruding from the switch body, and an end of the scattered object prevention plate is provided. At least four parallel cuts are formed at each of the four positions, and the portions between the cuts are bent to the same side to form cut-and-raised portions. Then, the opposite surface of the cut-and-raised portions is formed inside. And a cover that covers the lid with the cut-and-raised portion abutting against the inner surface of the lid while the scattered object prevention plate is in contact with the support portion. 2. The switch according to claim 1, wherein, when an internal element whose one end is fixed by bolting is installed in the switch body, the head of the fixing bolt is placed at the position of the support portion. A switch, wherein the switch is provided as a support for a splatter-prevention plate. 3. The switch according to claim 2, wherein the internal element is a lightning-resistant element integrally formed of an insulating resin.