JPH09284924A - Shutter for power board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote withstand voltage performance of a power board by providing rectangular shutter boards equipped with flaps along either one of a pair of ends on long sides. SOLUTION: A power board 1 is equipped with a plurality of fixed insulating cylinders 2 and board side terminals 3a and 3b projected to the insides of the insulating cylinders 2, and the board side terminals 3a and 3b are provided up and down at an interval each three phase. Rectangular shutter boards 11 for opening and shutting apertures 2a of the insulating cylinders 2 provided to the power board 1 at an interval between both up and down thereof and arranged in the horizontal direction simultaneously with three phase are provided, and flaps 11a are provided to both up and down ends of them. Since parts corresponding to the board side terminals 3a and 3b of the shutter boards 11 in the case a switch 5 is pulled out are flat, closed circuit between the shutter boards 11 and board side terminals 3a and 3b is hard to generate. As a result, withstand voltage efficiency of the power board can be promoted and, at the same time, the occurrence of warp can be prevented by the flaps.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchboard shutter provided on a switchboard or a cradle housed in the switchboard to open and close an opening for a board-side terminal.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a main part of a conventional switchboard disclosed in, for example, Japanese Patent Application Laid-Open Nos. 4-36163 and 61-4616. In the figure, 1 is a switchboard or a cradle in the switchboard (hereinafter simply referred to as switchboard), 2 is a plurality of insulating cylinders fixed to the switchboard 1, and 3a and 3b are board sides protruding into the insulating cylinder 2. These board-side terminals 3a and 3b are provided at intervals of three in the upper and lower sides, respectively.

Numeral 4 designates a plurality of openings 2a of the insulating cylinders 2 which are provided on the switchboard 1 at a distance from each other in the vertical direction and which are arranged in the horizontal direction.
The shutter plates 4 are rectangular shutter plates that are opened and closed at the same time, and these shutter plates 4 are opened and closed by vertically moving a support member (not shown) by operating an operation unit (not shown).
Further, the shutter plate 4 is made of an aluminum plate, and at the central portion in the vertical direction thereof, as shown in FIGS. 5 and 6, a squeezed-out portion 4a is provided along the longitudinal direction. Further, mounting holes 4b for mounting to the supporting member are provided at both ends in the longitudinal direction. A switch 5 is connected to the board-side terminals 3a and 3b.

In the conventional switchboard constructed as described above, there is a possibility that the shutter plate 4 made of an elongated thin plate may warp, and if warping occurs, it may interfere with other parts. For this reason, the shutter plate 4 is provided with the aperture punching-out portion 4a to prevent warpage.

[0005]

However, as described above, the aperture punching-out portion 4a is formed in the central portion of the shutter plate 4 in the vertical direction.
When the switch 5 is pulled out, that is, when the shutter plate 4 is closed, the squeeze-out portion 4a faces the front of the board-side terminals 3a and 3b as shown in FIG. In such a state, when a high voltage such as a lightning impulse is applied to the board-side terminals 3a and 3b, flashing may occur toward the squeeze-out portion 4a, and the withstand voltage performance deteriorates. there were.

The present invention has been made to solve the above problems, and an object thereof is to obtain a shutter for a switchboard which can improve the withstand voltage performance of the switchboard.

[0007]

A shutter for a switchboard according to a first aspect of the present invention is provided on a switchboard, and a turnback portion is provided along at least one of a pair of long side edges. In addition, a rectangular shutter plate that opens and closes an opening for a board-side terminal provided on the switchboard is provided.

In the shutter for the switchboard according to the second aspect of the present invention, the shutter plates are arranged so as to simultaneously open and close the openings for the three-phase panel-side terminals arranged in the horizontal direction, and the shutter plates are provided at the upper and lower ends of the shutter plate. A folded portion is provided.

A shutter for a switchboard according to a third aspect of the present invention uses a shutter plate made of an aluminum plate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a configuration diagram showing a main part of a switchboard according to an example of an embodiment of the present invention, FIG. 2 is a front view showing a shutter plate of FIG. 1, and FIG. 3 is a sectional view taken along the line III-III of FIG. Is.

In the figure, 1 is a switchboard or a cradle in the switchboard (hereinafter abbreviated as switchboard), 2 is a switchboard 1
A plurality of insulating cylinders 3a and 3b fixed to the insulating cylinder 2
These are the board-side terminals protruding inside, and these board-side terminals 3
The a and 3b are provided at intervals of three in the upper and lower sides, respectively.

Reference numeral 11 denotes a rectangular shutter plate which is provided on the switchboard 1 at intervals above and below and which simultaneously opens and closes the openings 2a of the insulating cylinders 2 arranged in the horizontal direction in three phases. By operating the operation unit (not shown), the support member (not shown) is vertically moved and opened / closed. Further, the shutter plate 11 is made of an aluminum plate, and folding portions 11a are provided at both upper and lower ends thereof as shown in FIGS. 2 and 3. Further, mounting holes 11b for mounting to the supporting member are provided at both ends in the longitudinal direction. A switch 5 is connected to the board-side terminals 3a and 3b.

In such a switchboard 1, the portion of the shutter plate 11 facing the panel-side terminals 3a, 3b when the switch 5 is pulled out is a flat surface, so that the shutter plate 11 is arranged at the same position as in the conventional case. If so, a flashover between the shutter plate 11 and the board-side terminals 3a and 3b is less likely to occur,
It is possible to have a margin in withstand voltage performance. Moreover, the folded-back portion 11a effectively prevents the shutter plate 11 from warping.

In the above example, the folded-back portions 11a are provided at the upper and lower end portions of the shutter plate 11, but the folded-back portions 11a may be provided in only one of them as long as it is possible to prevent warpage. The material of the shutter plate 11 is not limited to the aluminum plate.

[0015]

As described above, in the switchboard shutter of the first aspect of the present invention, the folded portion is provided along at least one of the pair of long side edges of the rectangular shutter plate. Therefore, when the shutter plate is closed, the portion of the shutter plate that faces the board-side terminal can be made flat, and the withstand voltage performance of the switchboard can be improved.

According to another aspect of the present invention, there is provided a shutter for a switchboard, wherein the shutter plates are arranged so as to simultaneously open and close the openings for horizontally arranged three-phase board-side terminals, and the shutter plates are folded back at both upper and lower ends thereof. Since the portion is provided, it is possible to more reliably prevent warpage in the elongated shutter plate.

Since the shutter for the switchboard according to the third aspect of the present invention uses the shutter plate made of an aluminum plate, it is lightweight and excellent in operability and can effectively prevent warpage.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part of a switchboard according to an example of an embodiment of the present invention.

FIG. 2 is a front view showing the shutter plate of FIG.

3 is a cross-sectional view taken along the line III-III of FIG.

FIG. 4 is a configuration diagram showing a main part of an example of a conventional switchboard.

5 is a front view showing the shutter plate of FIG. 4. FIG.

6 is a sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

1 switchboard or cradle, 2 openings, 3a, 3b
Board-side terminal, 11 shutter plate, 11a folded portion.

Claims (3)

[Claims] 1. An opening for a board-side terminal provided on the switchboard, wherein a folded-back portion is provided along at least one of a pair of long side edges. A switchboard shutter comprising a rectangular shutter plate that opens and closes. 2. The shutter plate simultaneously opens and closes openings for three-phase board-side terminals arranged in the horizontal direction, and the folded-back portions are provided at both upper and lower ends. The shutter for the switchboard described in 1. 3. The switchboard shutter according to claim 1, wherein the shutter plate is made of an aluminum plate.