JP2018038227A - Enclosed switchboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an enclosed switchboard which can prevent entry of foreign objects from the exterior, such as dust, water droplets, and a wire, while securing the ventilation ability.SOLUTION: An enclosed switchboard according to an embodiment includes: a ceiling plate; an opening provided at the ceiling plate; a pair of first folded parts provided at front and rear edge parts of the opening and formed by folding parts of the ceiling plate in a vertical upper direction; an upper plate which covers the upper side of the opening and is disposed spaced a predetermined distance away from upper ends of the first folded parts; and second folded parts which are formed by folding parts of the upper plate in a vertical lower direction so that the parts face the first folded parts from the outer side of the first folded parts. Gaps having predetermined lengths are formed between the upper ends of the first folded parts and an upper plate bottom surface and between the first folded parts and the second folded parts to form ventilation passages in which air flows.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a closed switchboard.

  The ventilation structure of a closed switchboard is generally provided with an intake port at the front lower part or rear lower part of the closed switchboard, and a large exhaust port is provided at the ceiling part at the upper center of the closed switchboard. A roof is provided at an exhaust port provided in the ceiling for the purpose of preventing entry of foreign matter such as water droplets from the outside.

Japanese Patent Laying-Open No. 2015-76909 JP-A-6-22417

  However, if a roof is simply provided at the exhaust port, there is a gap between the roof and the ventilation port. Therefore, IP4X of the IEC (International Electrotechnical Commission) standard, which is an international standard for dustproofing and waterproofing, that is, a diameter of 1 mm or more. It becomes difficult to satisfy the standard that no wire or solid object penetrates into the interior, and it is even more difficult to satisfy the IP5X standard that defines protection from dust.

  In view of the above problems, an object of the embodiment is to provide a closed switchboard that can prevent the entry of foreign matters such as dust, water droplets, and wires from the outside while ensuring ventilation capability.

  A closed switchboard according to an embodiment includes a ceiling plate, an opening provided in the ceiling plate, a pair of front and rear edges of the opening, and a part of the ceiling plate bent vertically upward A first folding part, an upper plate that covers an upper portion of the opening, and is disposed at a predetermined distance from an upper end of the first folding part, and a part of the upper plate is disposed on the first folding part. A second fold portion formed by bending a part of the upper plate vertically downward so as to face from the outside. A gap of a predetermined distance is formed between the upper end of the first fold portion and the bottom surface of the upper plate and between the first fold portion and the second fold portion, so that the internal air is ventilated. A ventilation path is constructed.

The fragmentary perspective view which looked at the upper part of the closed switchboard concerning 1st Embodiment from diagonally upward 1 is a longitudinal sectional view taken along line AA in FIG. 1 is a longitudinal sectional view taken along line BB in FIG. Enlarged view of the portion indicated by circle R1 in FIG. Enlarged view of the portion indicated by circle R2 in FIG. The figure concerning 2nd Embodiment and equivalent to the enlarged view of the part shown to circle | round | yen R1 of FIG. The figure concerning 2nd Embodiment and is equivalent to the enlarged view of the part shown to circle | round | yen R2 of FIG. A diagram according to the third embodiment and corresponding to FIG. It is a top view which shows the shape of the hole part concerning 4th Embodiment and was provided in the intermediate | middle board, (a) is a round shape, (b) is a rhombus, (c) is a flower shape, (d) is a slit type. Illustration The fragmentary perspective view which looked at the upper part of the closed switchboard concerning 5th Embodiment from diagonally upward

Hereinafter, embodiments will be described with reference to the drawings. In the description of the embodiment, substantially the same components are denoted by the same reference numerals, and description thereof is omitted.
(First embodiment)
1 to 5 are diagrams showing a schematic configuration example of a closed switchboard 1 according to the first embodiment. FIG. 1 is a partial perspective view of an upper part of a closed switchboard 1 according to the first embodiment as viewed obliquely from above, and FIG. 2 is a longitudinal section taken along line AA extending in the front-rear direction of the end position of the closed switchboard 1 shown in FIG. FIGS. 3A and 3B are longitudinal sectional views taken along line BB extending in the front-rear direction of the central position of the closed switchboard 1 shown in FIG. 4 is an enlarged view of a portion indicated by a circle R1 in FIG. 2, and FIG. 5 is an enlarged view of a portion indicated by a circle R2 in FIG. In FIG. 4 and FIG. 5, the screws and the like are omitted.

  As shown in FIGS. 1 to 5, the closed switchboard 1 includes a rectangular box-shaped closed switchboard main body 1 a, a busbar chamber 10 at the center of the inside, and a unit storage portion 9 at the front and rear portions. The unit storage portion 9 and the bus bar chamber 10 are partitioned by a partition plate 1b that partitions the bus bar chamber 10 in the vertical direction. The bus bar room 10 is provided with a horizontal bus bar 8 in the center of the interior. Since the horizontal bus 8 generates heat when the closed switchboard 1 is driven, the air in the bus chamber 10 is heated and the bus chamber 10 is heated. An opening 10a provided in the ceiling board 2 is located in the upper part of the bus bar chamber 10, and the opening 10a is covered with an intermediate plate 6 provided with a plurality of holes 6a.

  A switchboard unit 20 is detachably provided in the unit storage portions 9 provided before and after the closed switchboard 1. Although FIG. 1 shows a perspective view from the upper diagonal front, the configuration from the upper diagonal rear also has the same configuration, and the switchboard unit 20 is similarly arranged on the rear surface so that it can be inserted and removed.

  The closed switchboard main body 1a includes a flat ceiling plate 2 on the upper surface thereof. In the central part of the ceiling plate 2, an opening extending in the left-right direction is provided in the steel plate constituting the ceiling plate 2, and the opening is the above-described opening 10a. The ceiling plate 2 is provided with a pair of bent portions 2a that extend in the left-right direction along the edge portions positioned before and after the opening 10a and are bent in the vertical upward direction. A rectangular plate-shaped intermediate plate 6 is provided between the pair of folded portions 2a so as to close the opening 10a.

  In addition, although expressed as obstruction | occlusion, this does not mean even airtightness, and the air in the bus-bar chamber 10 enters and exits outside through a hole 6a provided in the middle plate 6 and gaps C1 and C2 described later. Is possible. It is understood that the entry of roughly large foreign objects can be prevented. Since the opening 10a is closed by the intermediate plate 6 provided with the hole 6a, it is possible to prevent foreign matters that are larger than the diameter of the hole 6a from entering or exiting.

  The middle plate 6 includes a bent portion 6b that is bent downward at a right angle at the front and rear edges thereof, and the bent portion 6b is fixed to a partition wall 1b between the unit housing portion 9 and the bus bar chamber 10. By connecting the left and right sides of the opening with the middle plate 6, the rigidity strength of the ceiling plate 2 of the closed switchboard main body 1a is improved.

  Spacers 4 are placed on the upper left and right end portions of the middle plate 6. The spacer 4 has, for example, a quadrangular prism piece shape. The spacer 4 has a predetermined height. An upper plate 3 is placed on the spacer 4. The spacer 4 is sandwiched between the middle plate 6 and the upper plate 3. On the upper plate 3, a hanging portion 5 is screwed and fixed to the middle plate 6 together with the upper plate 3 and the spacer 4 by screws (not shown). The upper plate 3 has a rectangular plate shape, and includes a bent portion 3a that is bent at a right angle at the front and rear end portions. The upper plate 3 and the hanging part 5 have a length substantially equal to the left and right length of the closed switchboard 1. The suspending portion 5 is an L-shaped member having a longitudinal direction in the left-right direction, that is, an angle (an angle steel), and has a suspending hole 5a for hooking a suspending hook or the like (not shown) at the center.

  The bent portion 3 a of the upper plate 3 is located on the outer side, that is, the front-rear side of the bent portion 2 a of the ceiling plate 2. The upper end portion of the bent portion 2a of the ceiling plate 2 and the bottom surface of the upper plate 3 are arranged with a gap C1 that is separated by a predetermined distance D1 in the vertical direction. The distance D1 is defined by the height of the spacer 4. The bent portion 2a of the ceiling plate 2 and the bent portion 3a of the upper plate 3 are arranged with a gap C2 that is separated by a predetermined distance D2 in the front-rear direction. The distance D2 is defined by the length of the upper plate 3 in the front-rear direction.

  As shown in FIG. 5, a hole 6a provided in the middle plate 6, a gap C1 between the upper end of the bent portion 2a and the bottom of the upper plate 3, and between the bent portion 2a and the bent portion 3a, The air passage 22 is constituted by a gap C2 located at locations facing each other. FIG. 5 schematically shows the air flow with arrows. As shown in FIG. 5, the heated air inside the bus bar chamber 10 communicates with the outside through the ventilation path 22, whereby the air inside the bus bar chamber 10 is ventilated by venting to the outside.

The upper plate 3 functions as a protective plate that covers the opening 10a, and prevents foreign matters such as water droplets falling from above from entering the closed switchboard 1.
The folded part 2a and the folded part 3a are positioned so as to face each other from above and below with their front and rear positions shifted, and between the bottom surface of the upper plate 3, the folded part 2a, the folded part 3a, and the top surface of the ceiling plate 2. The formed gap C1 and gap C2 form a crank-shaped passage. The lower end of the folded part 3a is located below the upper end of the folded part 2a. As a result, the inside of the busbar chamber 10 cannot be desired linearly from the front-rear direction, and even if an attempt is made to insert a thin rod-like foreign substance inside the folded part 3a, the intrusion is prevented by the folded part 2a beyond that. It is possible to prevent the inside from the portion 2a from reaching the inside, and to protect the inside of the closed switchboard 1 from the intrusion of foreign matter.

  That is, for example, it is possible to prevent the inside of a solid object such as a wire having a diameter of 1.0 mm or more from entering the inside, so that IEC standard IP4X, that is, a wire or a solid object having a diameter of 1 mm or more does not enter the inside. It becomes possible to satisfy the standard. The effect of protecting the inside of the closed switchboard 1 from the intrusion of a wire or the like from the outside improves as the position of the lower end of the folded part 3a is arranged lower than the position of the upper end of the folded part 2a.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. The difference between the closed switchboard 1 according to the second embodiment and the first embodiment is that a pedestal 2c that is further bent in the horizontal direction is provided at the upper end of the fold 2b provided at the top of the ceiling plate 2. The filter 12 is provided so as to fill a gap between the 2c and the bottom of the upper plate 3. Here, the folding part 2b corresponds to the folding part 2a in the first embodiment. If the filter 12 can be held between the folded portion 2b (corresponding to the folded portion 2a in the first embodiment) and the bottom of the upper plate 3, the pedestal portion 2c is not necessarily provided.

  The filter 12 has a rectangular parallelepiped shape having a longitudinal direction in the left-right direction. As the filter 12, it is possible to use, for example, urethane foam which is a foam in which urethane resin is expanded. The filter 12 has a three-dimensional network structure, and has a filter function for adsorbing and removing foreign matters such as dust from the passing air. The filter 12 is provided so as to fill the gap between the pedestal portion 2c and the bottom of the upper plate 3 without any gaps while being slightly pressed by the pedestal 2c and the bottom of the upper plate 3. Since the air in the bus bar chamber 10 is ventilated through the filter 12, dust is prevented from entering the bus bar chamber 10. As a result, the normal operation of the closed switchboard 1 is not hindered, and the safety of the closed switchboard 1 is not impaired. This also makes it possible to meet the IP5X standard that prescribes protection from dust.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. The closed switchboard 1 according to the third embodiment is different from the second embodiment in that the filter 12 is provided between the upper portion of the base portion 2c and the bottom surface of the upper plate 3 in the second embodiment. The filter 12a is provided between the front side surface of 2a and the rear side surface of the bent portion 3a. The filter 12a is bonded and fixed to the folded portion 2a and the folded portion 3a with, for example, an adhesive.

  According to this, there exists an effect similar to 2nd Embodiment. Moreover, since the same structure as 1st Embodiment can be utilized as a structure of the closed switchboard main body 1a, the simple structure which does not require the base part 2c is employable.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. 4th Embodiment demonstrates the variation of the shape of the holes 6a, 6b, 6c, 6d provided in the intermediate plate 6. FIG. The hole 6a shown in FIG. 9A is a round hole, and a plurality of holes 6a are arranged vertically and horizontally. The hole 6c shown in FIG. 9B is a diamond-shaped hole, and a plurality of the holes 6c are arranged vertically and horizontally. The holes 6d shown in FIG. 9C are flower-shaped holes, and the holes 6d are arranged in a staggered pattern. The hole 6e shown in FIG. 9D is a slit-shaped hole, and a plurality of the holes 6e are arranged vertically and horizontally. The arrangement of the holes 6a, 6b, 6c, 6d shown in FIGS. 9A to 9D is an example, and other arrangement methods may be used. For example, the holes 6e shown in FIG. 9D may be arranged in a staggered manner.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIG. The closed switchboard 1 according to the fifth embodiment is different from the first embodiment in that eyebolts 14 are provided in place of the hanging parts 5 provided in the first embodiment.

  The eyebolt 14 includes a donut-shaped hanging hole portion 14a having a hole in the center and a shaft portion 14b having a screw groove. The hanging hole portion 14a is for hooking with a hook or the like when the closed switchboard main body 1a is lifted, and the eyebolt 14 functions as a hanging portion. The upper plate 3 and the spacer 4 are screwed to the middle plate 6 by a screw groove provided in the shaft portion 14b of the eyebolt 14, whereby the closed switchboard main body 1a, the upper plate 3, the spacer 4 and the like are integrally screwed. It can be fixed. Further, when the closed switchboard body 1a is lifted using the eyebolt 14, there is no member that interferes with a crane wire (not shown), so that the lifting operation of the closed switchboard body 1a is facilitated.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 1 is a closed switchboard, 1a is a closed switchboard body, 2 is a ceiling plate, 2a is a folded portion (first folded portion), 2b is a folded portion (first folded portion), 2c is a pedestal portion, and 3 is an upper plate. 3a is a folded portion (second folded portion), 4 is a spacer, 5 is a suspended portion, 6 is a middle plate, 6a is a folded portion, 6a, 6c, 6d and 6e are hole portions, 10a is an opening portion, 12, 12a indicates a filter, and 14 indicates an eyebolt.

Claims (8)

A ceiling board,
An opening provided in the ceiling plate;
A pair of first folds provided at front and rear edges of the opening, wherein a part of the ceiling plate is bent vertically upward;
An upper plate that covers an upper portion of the opening and is disposed at a predetermined distance from an upper end of the first folded portion;
A second fold portion formed by bending a portion of the upper plate in a vertically downward direction so that a portion of the upper plate faces the outside of the first fold portion,
A gap of a predetermined distance is formed between the upper end of the first fold portion and the bottom surface of the upper plate and between the first fold portion and the second fold portion, so that the internal air is ventilated. Closed switchboard with a ventilation path.   2. The closed switchboard according to claim 1, wherein a lower end of the second fold portion is positioned below an upper end of the first fold portion.   The closed switchboard according to claim 1, wherein a filter is provided between the first folded portion and the upper plate.   The closed switchboard according to claim 1, wherein a filter is provided between an upper end of the first folded portion and a bottom portion of the upper plate.   The closed switchboard according to claim 1, wherein a filter is provided between an outer side surface of the first fold portion and an inner side surface of the second fold portion.   The closed switchboard according to claim 1, further comprising an intermediate plate that covers the opening and includes a hole that allows air to pass therethrough.   The closed switchboard according to claim 5, wherein a spacer is interposed between the middle plate and the upper plate. The closed switchboard according to claim 6, further comprising eyebolts that integrally screw the intermediate plate, the spacer, and the upper plate and function as a hanging portion of the closed switchboard.

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