JP3672073B2 - Switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a switch that opens and closes and switches a distribution line, and more particularly, to prevent a broken piece from being scattered outside a case in the event of an internal short circuit of a pole switch disposed in an overhead distribution line. The present invention relates to a structure for mounting a flying object preventing plate of a switch provided with the other flying object preventing plate.
[0002]
[Prior art]
Conventionally, a switch enclosed in a case has a case body opening and its opening in order to prevent the internal pressure from rising abnormally and causing the case body to explode and break when an accident such as an internal short circuit occurs. A pressure release part is provided between the cover and the cover, and the internal pressure is released by operating the pressure release part when the internal pressure rises.
When the internal pressure is released, in order to prevent the debris inside the case from splashing outside and harming the surrounding people, a scattered object prevention plate with a metal mesh and a number of ventilation holes is placed over the case opening. Provided.
[0003]
As a technique for attaching these scattered matter prevention plates to a case, a cased switch of Japanese Utility Model Publication No. 61-149246 has been proposed. As shown in FIG. 6, a stepped portion 5 is formed continuously inwardly on the periphery of the case opening, and the inner surface of the stepped portion 5 is disposed on the inner surface of the stepped portion 5 at right angles to the longitudinal direction. A scattered matter prevention plate 19 having a large number of ventilation holes 21 is fitted between and attached to the upper end surface of the interphase insulating plate 17.
[0004]
In addition, as another method for attaching the scattered matter preventing plate, as shown in FIG. 7, hemispherical protrusion cushioning materials 23 are disposed at the four corners of the upper surface of the scattered matter preventing plate 22, and FIG. As shown in FIG. 9, the scattered matter prevention plate 22 is placed on the head of the fixing bolt 26 of the internal element 25 fixed to the mounting seat 24 inside the case. Next, as shown in FIG. 9, the scattered matter preventing plate 22 is held and fixed by covering the lid 27 so that the inner surface of the lid 27 abuts against the cushion material 23 and pinches it.
[0005]
[Problems to be solved by the invention]
However, the former structure for mounting the flying object prevention plate 19 is such that the ground insulating plate (not shown) and the interphase insulating plate 17 disposed inside the case body 1 are fitted into the engaging grooves provided respectively. Therefore, the scattered matter prevention plate 19 is not sufficiently fixed and held. In addition, the interphase insulating plate 17 and the ground insulating plate are restricted from the mounting position and mounting posture of the devices and elements mounted in the switch case body 1, and the ground insulating plate, the interphase insulating plate 17, and the scattered matter prevention. It is difficult to form the plate 19 integrally. Furthermore, when the ground insulating plate and the interphase insulating plate 17 must be disposed avoiding these devices and elements, the dimensions of the interphase and the ground must be increased, and the case body 1 is enlarged. Become.
[0006]
In addition, the latter structure for mounting the flying object prevention plate 22 has a large number of parts, and there is also a concern of causing a simple trouble such as forgetting to attach the cushion material 23.
On the other hand, as a recent trend, for the purpose of effective lightning damage protection, ground fault short circuit protection, and automation of distribution lines, lightning protection elements, voltage detection capacitors, distribution line connection signal coupling capacitors, controller drive power transformers In many cases, various devices and elements such as a switch are mounted in a switch case at high density. FIG. 10 and FIG. 11 show an example, and A in the figure is a lightning protection element.
[0007]
Therefore, in view of such a situation, the present invention is not limited to the scattered matter prevention plate, even if related devices and elements such as lightning damage protection, ground fault short circuit protection, automation, etc. are installed in the switch case. Provided with a switch that can be attached independently of the insulation plate, reduces the number of parts such as cushioning materials and the number of mounting work, and further suppresses the enlargement of the case body That was the issue.
[0008]
[Means for Solving the Problems]
The present invention provides a switch that forms a pressure release part when the internal pressure rises by covering with a lid with a lid on the opening of the case main body that houses the switching contact and the switching mechanism, and sealing with a predetermined force.
Support portions disposed at least at four locations inside the opening;
The portion between the cut the two parallel cuts from the outer circumference by bending as occurs toward the outer peripheral side, and the cut-and-raised parts none at least four positions of the end portions are formed on the same side A scattered matter prevention plate having a ventilation portion that is a plurality of holes formed on substantially the entire surface,
With
The scattered matter prevention plate is arranged inside the opening so that the surface opposite to the side where the cut and raised part is raised is brought into contact with the support part, so that almost the entire surface of the opening is cut and raised. It is characterized in that it is covered with a scattered matter prevention plate so as to be shielded by the surface, and the cut and raised portion is brought into contact with the inner surface of the lid and is covered with the lid so as to be held by a restoring force by elastic deformation .
[0009]
Here, an internal element which is installed in the switch body and whose upper end on the opening side is fixed by a fixing bolt can be provided, and the whole of the support portion can be a head of the fixing bolt . In addition, a lightning protection element integrally formed with an insulating resin can be used as the internal element.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described based on 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. The flying object prevention plate 1 is formed by punching a metal plate such as 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 right angles as a displacement stopper, A pair of parallel cuts are made at four locations close to the end in the longitudinal direction, and the portion sandwiched between the cuts is bent obliquely upward to form the cut-and-raised portion 3. In addition, you may form the scattered matter prevention board 1 with the insulating board which has heat resistance and cushioning properties, such as a polyester glass mat, for example.
[0011]
FIG. 3 is a cross-sectional view of the state in which the scattered matter 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 from the side. As shown in both figures, a mounting seat 4 having an L-shaped cross-section projecting from the inner periphery of the case opening in the longitudinal direction is welded to the inner surface of the case 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 protection element or a voltage detection capacitor element is fixed in the vertical direction.
[0012]
On the other hand, the mounting seat 4 is also welded to the case main body 5 in the longitudinal direction of the opposing case opening, and a hexagon bolt 6 is inserted into the mounting seat 4 from above so that an internal element 7 such as a lightning protection element or a voltage detection capacitor element is formed. Fixed in the vertical direction, the head portion of each hexagon bolt 6 is located on the same plane.
The scattered matter prevention plate 1 is placed on the flat portion of each hexagon bolt 6 to which the internal element 7 of the mounting seat 4 is fixed, almost completely covers the case opening, and the tip of the cut-and-raised portion 3 is the lid 8. It contacts the inner peripheral part. That is, the scattered matter prevention plate 1 is sandwiched between the head flat portion of each hexagon bolt 6 and the peripheral portion inside the lid 8.
[0013]
Next, the lid 8 is bolted to the case body 5 and attached with a predetermined force, so that the cut-and-raised portion 3 of the scattered matter preventing plate 1 is pressed and elastically deformed. Is held by the case body 5 and stabilized.
FIG. 5 shows a state in which the opening of the case main body 5 is covered with the lid 8, and is further fixed using a fastening means such as a bolt (not shown) so as to be opened when the internal pressure rises to a constant pressure.
[0014]
Here, the lightning protection element, the voltage detection capacitor, the distribution line carrying signal coupling capacitor, and the controller driving power transformer that are installed as internal elements are integrally molded with epoxy resin together with the terminals and mounting inserts, and are extremely compact and Predetermined insulation performance is ensured and assembly is easy.
As a result, the ground insulating plate and the interphase insulating plate have few restrictions on the mounting position and mounting posture of these devices and elements, and it is not necessary to expand the interphase or ground-to-ground dimensions, and the case body 5 can be prevented from being enlarged.
Further, unless the mounting seat 4 protruding from the inner peripheral portion in the vicinity of the longitudinal direction of the case opening is welded to the case main body 5 at an extreme step, no strict tolerance is required.
[0015]
After the switch is installed, if an accident such as an internal short circuit occurs and the internal pressure rises abnormally, the cover 8 is pushed through the numerous air holes 2 formed in the flying object prevention plate 1. Then, a pressure release mechanism (not shown) is activated, and a gap is generated in the case body 5 and the lid 8, and high-pressure gas generated inside is released from the gap, and at the same time, debris inside the case is scattered outside. Attempts are made to block by the flying object prevention plate 1 in front of the gap.
In this way, even for switches that tend to increase in size due to the high density of various devices and elements such as lightning protection elements, voltage detection capacitors, and signal transmission coupling capacitors in the switch case, a dedicated fixing tool is also required. In addition, the flying object prevention plate 1 can be attached very easily, and can be sufficiently fixed and held inside the case body 5 even when the switch is transported or mounted.
[0016]
Therefore, according to the present invention, even if the device or element is mounted in the switch case, the scattered matter prevention plate is sandwiched between the bolt head and the lid to which the device or element is fixed, It can be attached independently.
In addition to reducing the number of parts such as cushioning materials and improving the workability of assembly, it is no longer necessary to increase the interphase and ground-to-ground dimensions, or to add a new mounting device for a flying object prevention plate. Increase in size can also be suppressed.
[0017]
【The invention's effect】
As described above, according to the present invention, the inner side of the flying object preventing plate is supported by being in contact with the support part on the switch body side, and the cut-and-raised part is in contact with the inner surface when the outer lid is incorporated. By being supported, it is possible to reduce the number of parts and the number of assembling steps without requiring parts for mounting in addition to the scattered matter prevention plate.
[Brief description of the drawings]
FIG. 1 is a perspective view of a flying object preventing plate according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
3 is a cross-sectional view of the scattered matter prevention plate of FIG. 1 as viewed from the front.
4 is a cross-sectional view of a state where the scattered matter prevention plate of FIG.
FIG. 5 is a perspective view of the switch in the state of FIGS. 3 and 4. FIG.
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 cross-sectional view showing a conventional example.
FIG. 10 is a cross-sectional view showing a conventional example.
FIG. 11 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Scatter prevention board 2 Vent hole 3 Cut and raised part 4 Mounting seat 5 Case main body 6 Hexagon bolt 7 Internal element 8 Lid

Claims (3)

In a switch that forms a pressure release part when the internal pressure rises by covering the opening of the case body housing the switching contact and the opening and closing mechanism part with a lid through a packing and sealing with a predetermined force,
Support portions disposed at least at four locations inside the opening;
The portion between the cut the two parallel cuts from the outer circumference by bending as occurs toward the outer peripheral side, and the cut-and-raised parts none at least four positions of the end portions are formed on the same side A scattered matter prevention plate having a ventilation portion that is a plurality of holes formed on substantially the entire surface,
With
The scattered matter prevention plate is arranged inside the opening so that the surface opposite to the side where the cut and raised part is raised is brought into contact with the support part, so that almost the entire surface of the opening is cut and raised. A switch comprising: a cover for covering with a flying object preventing plate so as to be shielded by a surface; and covering the cut and raised portion with an inner surface of the lid so as to be held by a restoring force by elastic deformation . The switch according to claim 1, further comprising an internal element that is installed in the switch body and whose upper end on the opening side is fixed by a fixing bolt,
The switch according to claim 1, wherein all of the support portions are heads of the fixing bolts.   3. The switch according to claim 2, wherein the internal element is a lightning protection element integrally formed with an insulating resin.

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