JPS586224A - Switchboard - Google Patents

Abstract

PURPOSE:To facilitate maintenance of a switchboard by exhausting the air by reversing a suction fan and vibrating a filter by a vibrating plate and thereby removing dust adhering on the filter. CONSTITUTION:In normal time, the outside air is introduced by a suction fan 9 into a box 1 through an air vent 4 and a filter 12, and electric parts 7 are cooled by the air. The air is exhausted from an opening of a shielding plate 6 through a dust guard plate 5. In maintenance operation, the suction fan 9 is reversed to apply reverse pressure to the filter 10. At the same time, a vibrating device 21 is operated to obtain the direction of air current in the box 1 as shown by arrows 24-29. The air is exhausted from the air vent 4 through the filter 10, and a vibrating plate 22 is vibrated by the vibrating device 21. Since the vibrating plate 22 is connected with the filter 10, the filter is also vibrated and dust adhering on the filter 10 is removed by the vibration and exhaust air.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dust-proof forced ventilation type power distribution board, and particularly to maintenance and improvement for ensuring a sufficient amount of cooling air.

The structure of a conventional switchboard will be explained with reference to FIG. 111I.

Figure 1 is a cross-sectional view of a forced ventilation type switchboard.
1 base 2, #3, vent 4, dustproof plate 5, middle closing plate 6,
Electrical items 7, wind guide 8, air intake 77, filter 10. It is composed of a banking l11 sending air 12, an intake air 13, a dust removing air @ 14, an air sending 15, a cooling air flow 16, an ascending air fi 17, an exhaust air 18, and an exhaust air 19.

Next, the characteristics of the forced ventilation type switchboard will be explained with reference to Figures 4 and 5.

When electrical appliances are operated, they generate heat and their temperature rises, but for electrical appliances made of metal, insulating materials, and other materials, excessive temperature rises can damage the insulation performance and seriously shorten the lifespan. For this reason, a method is adopted in which air is pumped in to increase the cooling effect of the wind.

FIG. 4 is a diagram showing the wind speed and the heat dissipation effect due to the wind speed. Show its characteristics to your ImA.

Figure #I4 shows the cooling effect when the wind speed is increased or decreased by setting the wind speed to 2F11/8 t-1oo-. When the wind speed decreases to 751, the cooling effect decreases to about 90, and the wind speed decreases to 50.
- It can be seen that the cooling effect decreases to about 75-.

In the JIIS diagram, curve B shows the change in wind speed due to filter clogging measured at an actual plant.According to this, it took about 65 days to 2 months for the wind speed to drop to 75%.

Since then, clogging has been accelerating, and it has been found that a maintenance pitch of about one month is a good guideline.

In this way, it has been found that if the filter is not clogged, it will impede continued operation.

For maintenance purposes, there are many cases in which users request a pitch of 3 to 6 months.

An object of the present invention is to provide a dust-proof switchboard equipped with a filter clogging device that can be used in daily operation to prevent extreme deterioration in the performance of dust-proof filters.

Below ii! The configuration of the present invention is shown in FIGS. 2 and 3.

FIG. 2 is a structural sectional view of the dust-proof switchboard according to the present invention during normal operation. Dustproof box 1, base 2, door 3, vent 4
, dustproof plate 5, shutter closing plate 6, electrical equipment 7, wind guide 8, air intake 77
filter 101 backing 111 air blower 12, intake air 13, dustproof airflow 14, airflow 15, cooling airflow 16, rising airflow 17, exhaust air 18, exhaust air 19 dustproof plate 20, vibration device 21. It is composed of a diaphragm 22.

This is an example of performing maintenance operation to eliminate clogging in IN3 diagram F1. #I2 What differs from Figure I2 is the reversal of the fan, the reversal of the wind direction, and the vibration of the vibration plate due to the operation of the vibration device. Dustproof box 1, base 2, door 3, vent 4, dustproof plate 5,
middle closing plate 6, electrical equipment 7, wind guide 8, intake fan 9, filter 1O, backing 11, dustproof plate 20, vibration device 21.
It is composed of a diaphragm 22, a back wind 23, a reverse air intake 24, a reverse air flow '25, a reverse wind R26, a reverse Sakai flow 27, a reverse exhaust 28 and a rejected air 29. ◎ Also, an example of the structure of the vibration device is shown in Fig. 6. shows.

Its operation is based on a general-purpose buzzer mechanism. Vibration device case 31A1 diaphragm 32, iron core 34, wire 3
5, suction plate 36, shaft 37, spacer 38, support plate 39 bearing 46, spring 41, opening/closing contact 42, wiring 431.
It is composed of a screw 44, a DC voltage 45, and an operation command device 46.

In the present invention, during normal operation, the vibration plate 324 is stopped while the vibration device 21t is stopped, which is the same as in the conventional case.

The outside air is taken in as it is, dust is removed with a filter 1O, the 9 air is sent in with an intake 7 an 9, the electrical equipment is cooled, and the air is exhausted.
Ru.

During the maintenance operation shown in Fig. 3, the intake is stopped, the intake 77 is reversed, and the filter IOK reverse pressure t'' is applied.
Since the vibrating device 121 is rotated i and vibrated by the diaphragm 32t, the connected filter 10 is also vibrated, so that the dust that has become clogged t9 is discharged.

It is also possible to perform dust removal maintenance at regular intervals every day using an automatic timer or the like.

As described above, according to the present invention, maintenance can be carried out unattended even in unmanned aircraft fields or places where maintenance work cannot be carried out in snowy areas, which is very effective in extending the service life.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional dust-proof switchboard, FIG. 2 is a cross-sectional view of a dust-proof switchboard according to the present invention during operation, and FIG.
Cross-sectional view of a dust-proof switchboard during maintenance work by Takaaki Moto, $4
M is a graph showing the cooling effect of the switchboard, FIG. 115 is a graph similarly showing changes in wind speed, and FIG. 6 is an example of a structural sectional view of the vibration device. 1...Dustproof box body 2...Base 3...Door
4...Vent hole...Dustproof plate 6
...Shell closing plate 7...Electrical components 8...Wind conductor 9...Intake fan 1O...Filter 11...
・Backing 12.・, Air blower 1301. intake
14... Dust removal air 15... Air supply 16
...Cooling air flow 17...Updraft 18...
Exhaust 19...Exhaust air 20...Dustproof plate 21.
・・Vibration device i 31A ・・Case 32・・
・Vibration 1 33... Headwind 34... Iron core 35...-wheel 36... Suction plate 37... Shaft 38... Spacer 3
9...Support plate 40...Bearing 41...Spring 42...Opening/closing contact 43...Wiring 44
...Screw 45...DC power supply 46...Operation command device (7317) Representative Patent Attorney Yuki Chika (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4 → Wind t <” /s) - time opening hat)

Claims (1)

[Claims] Eye 11 of the dust removal filter in a forced ventilation type switchboard
In order to eliminate the blockage, the intake fan is reversed to exhaust the air, and the diaphragm built into the filter is vibrated.
A switchboard characterized by removing dust.