JP2011193655A - Box body for metal-enclosed switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a box body for a metal-enclosed switchgear that improves mechanical strength with a thin plate. <P>SOLUTION: The box body for a metal-enclosed switchgear comprises planar side-surface plates 1a, 1b, a rear-surface plate 4, a ceiling plate 5, a floor plate 6, and a front door so as to store an electric apparatus such as a circuit breaker or a breaker. An oval corrugated part 2 with continuous crests and valleys is provided at least at the face center part of the side-surface plate 1a, 1b on both sides of the box body, thereby reducing weight and improving mechanical strength. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a box body of a metal closed switchgear that houses electrical equipment such as a circuit breaker and a disconnecting switch.

  2. Description of the Related Art Conventionally, electrical devices such as circuit breakers and disconnectors used in metal closed type switchgears are housed and used in a box made by combining plate-shaped steel plates having smooth surfaces into a rectangular shape (for example, Patent Documents). 1).

JP 2009-17756 A (Page 3, FIG. 1)

  In the case of the above-described conventional metal closed switchgear box, when an electrical device causes a short-circuit accident and an internal arc is generated, the structure is easily swelled or bent due to an increase in pressure. That is, since the plate thickness of the steel plate is as thin as about 1 to 2 mm and has a smooth surface, the mechanical strength has a limit.

  Although it is conceivable to increase the mechanical strength by increasing the thickness of the steel plate to, for example, 5 mm or more, or by reinforcing it with a reinforcing material or the like, it becomes a heavy article. For this reason, a box which can improve mechanical strength with a thin plate thickness has been desired.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a box body of a metal closed switchgear that can improve mechanical strength with a thin plate thickness.

  To achieve the above object, a metal closed switchgear box of the present invention is a metal closed switchgear box comprising a side plate, a back plate, a ceiling plate, a floor plate, and a front door. The corrugated portion is provided at least in the center of the surface of the side plate.

  According to the present invention, since the corrugated portion is provided on the thin steel plate, the weight of the box can be reduced and the mechanical strength can be improved.

The perspective view which expands and shows a part of structure of the box of the metal closed type switchgear which concerns on Example 1 of this invention. The perspective view which shows the structure of the box of the metal closed type switchgear which concerns on Example 2 of this invention. The expanded sectional view which shows the structure of the box of the metal closed type switchgear which concerns on Example 3 of this invention. The expanded sectional view which shows the structure of the box of the metal closed type switchgear which concerns on Example 4 of this invention.

  This invention exists in providing a corrugated part of uneven | corrugated shape in a steel plate. Embodiments of the present invention will be described below with reference to the drawings.

  First, a box body of a metal closed switchgear according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is an enlarged cross-sectional perspective view showing a part of the configuration of a box body of a metal closed switchgear according to Embodiment 1 of the present invention.

  As shown in FIG. 1, corrugated portions 2 having a concavo-convex shape in the depth direction from the upper part to the lower part are provided on the side plates 1 a and 1 b on both sides constituting the rectangular box. A steel plate having a thickness of 1 to 2 mm is pressed, for example, and an oval valley or peak is continuously provided at the center of the plate surface. The periphery of the four sides is a smooth surface, and the four corners are fixed to a box pillar (not shown) with bolts 3.

  The back plate 4, the ceiling plate 5, the floor plate 6, and the intermediate plate 7 that partitions the box body up and down also have the corrugated portion 2. The intermediate plate 7 constitutes an upper chamber 8 and a lower chamber 9 that house electrical devices such as a circuit breaker and a disconnecting switch. Further, the openable front door (not shown) is similarly provided with a corrugated portion 2.

  Thereby, each board 1a, 1b, 4, 5, 6, 7 can improve mechanical strength by the waveform part 2. FIG. Further, the corrugated portions 2 such as the side plates 1a and 1b and the back plate 4 have valleys and peaks formed in the vertical direction, so that it is difficult for dust to accumulate. The direction of the corrugated portion 2 of the ceiling plate 5, the floor plate 6, and the intermediate plate 7 may be either the width direction or the depth direction.

  Here, since the area of the side plates 1a and 1b is the largest, by providing the corrugated portion 2 at least on the side plates 1a and 1b, it is possible to prevent bulging or the like due to a pressure increase when an internal arc is generated. Further, since the peripheral portions such as the side plates 1a and 1b and the back plate 4 are not provided with the corrugated portion 2 and are smooth surfaces, the fixing to the box pillar (not shown) can be made strong.

  According to the box body of the metal closed type switchgear of the first embodiment, since the corrugated portion 2 is provided on at least the side plates 1a and 1b constituting the box body, the plate thickness can be reduced and the weight can be reduced. The mechanical strength can be improved so that it can endure during earthquakes and earthquakes. Moreover, since the surface area is increased by the corrugated portion 2, the heat radiation efficiency can be improved.

  Next, a box body of a metal closed switchgear according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a perspective view showing a configuration of a box body of a metal closed switchgear according to a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is the size of the corrugated portion. In FIG. 2, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 2, the side plates 1a, 1b and the back plate 4 on both sides are provided with corrugated portions 2 on the upper and lower sides, respectively, with an intermediate plate 7 separating the upper and lower sides of the box. The portions of the plates 1a, 1b, and 4 that are in contact with the end surface of the intermediate plate 7 are smooth surfaces.

  According to the box body of the metal closed type switchgear of the second embodiment, in addition to the effects of the first embodiment, the end surface of the intermediate plate 7 is in contact with the intermediate portions of the side plates 1a and 1b and the back plate 4, and the upper chamber 8 The air flow between the lower chambers 9 can be cut off, and the chambers 8 and 9 can be made independent spaces.

  Next, a box body of a metal closed switchgear according to a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is an enlarged cross-sectional view showing the configuration of the box body of the metal closed switchgear according to the third embodiment of the present invention. The third embodiment differs from the second embodiment in that an anti-vibration rubber is provided. In FIG. 3, the same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. An explanation will be given taking the intermediate plate as an example.

  As shown in FIG. 3, an anti-vibration rubber 11 is sandwiched between the intermediate plate 7 and the fixed plate 10, a bolt 12 is penetrated from the fixed plate 10 side, and doubled via a spring 13 at the trough of the corrugated portion 2. It is fixed with a nut 14. An electric device 15 is fixed to the fixed plate 10. Here, the spring force of the spring 13 is made larger than the repulsive force when the vibration-proof rubber 11 is compressed to a predetermined value of 10%, for example. This is because the anti-vibration rubber 11 is firmly fixed while maintaining the vibration absorption effect of the anti-vibration rubber 11.

  According to the box body of the metal closed switchgear of the third embodiment, in addition to the effects of the second embodiment, the vibration of the electric device 15 can be absorbed by the vibration isolating rubber 11.

  In the third embodiment, the vibration isolating rubber 11 is provided on the intermediate plate 7. However, the vibration and noise of the entire box can be absorbed by providing the anti-vibration rubber 11 on the floor plate, the side plate, the back plate, and the like. In this case, it is not necessary to fix the electric device 15 or the like to the fixing plate 10. For this reason, the fixed plate 10 is referred to as facing the electric device 15.

  Next, a metal closed switchgear box according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is an enlarged cross-sectional view illustrating a configuration of a box body of a metal closed switchgear according to a fourth embodiment of the present invention. The fourth embodiment differs from the third embodiment in that a decorative board is provided. In FIG. 4, the same components as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. An explanation will be given taking the intermediate plate as an example.

  As shown in FIG. 4, a decorative plate 16 having a smooth surface is fixed to the double nut 14 side of the intermediate plate 7. In addition, the decorative board 16 improves aesthetics by providing at least the front door which becomes the outer side of a box.

  According to the box body of the metal closed switchgear of the fourth embodiment, in addition to the effects of the third embodiment, the aesthetics of the box body can be improved.

1a, 1b Side plate 2 Corrugated part 3, 12 Bolt 4 Back plate 5 Ceiling plate 6 Floor plate 7 Intermediate plate 8 Upper chamber 9 Lower chamber 10 Fixed plate 11 Anti-vibration rubber 13 Spring 14 Double nut 15 Electric device 16 Decorative plate

Claims (5)

A metal closed switchgear box composed of a side plate, a back plate, a ceiling plate, a floor plate, and a front door,
A box body of a metal closed type switchgear characterized in that a corrugated portion is provided at least in the center of the surface of the side plate. A side plate, a back plate, a ceiling plate, a floor plate, a front door, and a box body of a metal closed switchgear composed of an intermediate plate that partitions the middle part of the box body,
A box body of a metal closed type switchgear, wherein corrugated portions are provided at least on the side plate surface and the back plate surface with the intermediate plate as a boundary.   An anti-vibration rubber is sandwiched between at least the side plate provided with the corrugated portion and a fixed plate facing an electric device, and the side plate and the fixed plate are fixed with a bolt via a spring. The box body of the metal closed type switchgear according to claim 1 or 2.   4. The metal closed switchgear box according to claim 3, wherein the spring force of the spring is made larger than the repulsive force of the vibration-proof rubber.   The box body of the metal closed switchgear according to any one of claims 1 to 4, wherein a decorative plate is provided at least outside the front door.

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