JPS6152601B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a closed switchboard, and more particularly to a cooling structure thereof.

The downsizing and centralization of electrical equipment always brings with it the problem of cooling. The downsizing and centralization of closed switchboards, especially dust-proof closed switchboards, poses a problem in that the temperature in the equipment room increases due to heat generated by circuit breakers. For this reason, in a typical closed switchboard, ventilation holes are made in the equipment room door, rear bulkhead plate, upper and lower bulkhead plates, etc., and outside air is passed through these ventilation holes to cool circuit breakers and other parts.

However, closed switchboards placed in dusty locations require completely sealed dust-proof switchboards to maintain the insulation of the housed equipment and the performance of electrical contacts. As a result, heat dissipation in the equipment room deteriorates, the temperature rises, and the current carrying capacity of circuit breakers and other devices decreases.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a closed switchboard that can effectively cool and dust-proof an equipment room, and that is compact and can be stacked in multiple stages without impairing current carrying capacity.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, doors 6 to 9 are attached to equipment rooms 2 to 5, which are arranged in multiple stages within a box 1, respectively, and circuit breakers 10 to 13 are housed inside. This circuit breaker is connected to the rear panels 14 to 5 of equipment rooms 2 to 5.
Power supply side main circuit disconnection section 18 attached to 17
21 and load-side main circuit disconnecting parts 22-25 to busbars 26-29 and feeder conductors 30-33, and busbars 26-29 are connected to horizontal busbars 34-3, respectively.
6.

Further, the horizontal gaps A to D, which are formed between the lower partition plates 37 to 39 and the upper partition plates 40 to 42 of the equipment rooms 2 to 5 and the lower partition plate 43, are formed by the rear plates 14 to 17 at the rear end. The front armor window serves as a ventilation passage from the decorative panels 61 to 63, 55, etc. to the busbar room 47 through ventilation holes provided in the front panel.

At the rear of the box 1, a control room 51 completely sealed with control room partition plates 48, 49, a door 50, etc. is divided into two parts 51a, 51b on both sides of an inspection space 52.

In the lower part of the control room 51, a ventilation passage E is formed by the control room bulkhead plate 49, the floor plate 44, and the side plates 53 and 54 shown in FIG. It will be established as follows.
Further, on the upper part of the floor plate 44, there are dust collecting plates 59, 60 with handles 57, 58, and an exhaust hole F is provided at the upper end of the busbar chamber 47, as shown in FIGS. 1 and 3. Further, as shown in FIG. 2, vertical gaps G, H, and I are formed between the side plates 45 and 46 of the equipment chambers 1a to 1d, which are narrower than the busbar chamber 47, and horizontal gaps A to D. communicate with.

In FIG. 1, busbars 26 to 29, feeder conductors 30 to 33, and horizontal busbars 34 to 36 are covered with an insulating material, and connections between these conductors and terminals of main circuit disconnection sections 18 to 25 and cables 64 to 67 There is an insulating cover (not shown) at the connection part to prevent contamination due to ventilation. FIG. 3 shows a front view of the equipment rooms 2 to 5 sealed with doors 6 to 9, and FIG. 4 shows a rear view of the control room sealed with a door 50.

Next, the operation of the present invention will be explained.

As shown in Figures 1 and 2, equipment and control supplies whose functions are impaired by dust are located in the equipment rooms 2 to 5, the control room 51a,
51b, so it is completely protected from dust.

When the temperature of the equipment room rises due to heat generated by the equipment in the equipment rooms 2 to 5, the equipment rooms 2 to 5 are cooled from all around by outside air flowing into the horizontal gaps A to E and the vertical gaps G to I. Figure 3 shows the flow of outside air seen from the front of the closed switchboard, and the flow of air seen from the side is shown by the arrow lines in Figure 1. Part of the outside air that entered through the horizontal gaps A to E The conductor in the busbar chamber 47 is cooled and rises through the ventilation hole in the rear plate and is discharged from the ventilation hole F, and a portion is discharged upward through the lateral gaps G to I.

Although the conductor in the busbar chamber 47 is exposed to the outside air, there is no problem because the surface of the conductor is covered with a stain-resistant insulator and the connection portion of the conductor is covered with an insulating cover.

Further, dust accumulated on the conductor can be cleaned from the inspection space 52 shown in Fig. 2 during regular inspections, and dust accumulated on the dust collection plates 59 and 60 can be collected by opening the doors 55 and 56 of ventilation passages D and E. It is pulled out together with the dust plates 59 and 60.

Note that the vertical gaps G to I of the present invention may be made symmetrical to the side edges of the busbar chamber as shown in FIG. 2 to make the equipment chamber narrower than the width of the busbar chamber; As shown, one side of the equipment room may coincide with one side of the busbar room.

Further, the armor windows 61 to 63, 55 are for increasing heat radiation from the upper partition plate.

〔Effect of the invention〕

As described above, according to the present invention, only the minimum part that requires dustproofing is housed in the dustproof room, and a horizontal gap is provided at the bottom of each equipment room, and a vertical gap is provided on the side of each equipment room. A ventilation hole is provided in the rear plate at the rear end of the horizontal gap to improve the cooling effect of the stored equipment, making it possible to obtain a completely dust-proof closed switchboard that guarantees the current carrying capacity of the equipment.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the closed switchboard of the present invention, FIG. 2 is a sectional view taken along J-J in FIG. 1, FIG. 3 is a front view of the closed switchboard shown in FIG. 1, and FIG. 1 is a rear view of the closed switchboard shown in FIG. 1, and FIG. 5 is a plan view showing another embodiment of the present invention corresponding to FIG. 2. 2, 3, 4, 5...equipment room, A, B, C, D,
E...Horizontal gap, G, H, I...Vertical gap,
19, 20, 21...through hole, 47...busbar chamber.

Claims (1)

[Scope of Claims] 1 Equipment rooms in which electrical equipment is hermetically stored are stacked in multiple stages, a bus room is provided at the rear of the equipment room that is common to the upper and lower sides via a rear panel, and an exhaust gas In a closed switchboard arranged in a row with openings, a horizontal gap provided on the lower side of the equipment room and a side surface of the equipment room, which is narrower than the width of the bus bar room, are formed vertically between the horizontal gap and the horizontal gap. a vertical gap communicating with a side end of the gap, and a ventilation hole provided in the rear plate at the rear end of the horizontal gap, communicating the horizontal gap and the vertical gap with the busbar chamber; A closed switchboard characterized by comprising: and.