JP2000102774A - Dust proofing method of control panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent dust and soot from intruding into a control panel even when the control panel is installed in an atmosphere containing large quantity of dust and soot by supplying pressurized air to the control panel and keeping the inside of the control panel under positive pressure. SOLUTION: In the case of removing dust and soot from dust-containing air sucked from a tunnel, etc., for automobile or the like to a ventilation duct 11, each dumper 81, 82 laid in a plural row is opened and an electric dust collecting part 71 and each driving drum 34, 35 are worked to remove dust from the dust-containing air by the electric dust collecting part 71 and a belt-like filter 21. The belt-like filter 21 is wound in the normal and reverse direction and constantly regenerated by blowing pressurized air to the surface from each air jetting nozzle 41, 42. On the other hand, the regeneration of the electric dust collecting part 71 is performed by blowing the pressurized air to the electrode plate surface from an air jetting nozzles 83. At this time, the inside of the control panel is kept under positive pressure. That is, air pressurized by a compressor 66 and dehumidified by a cooler 91 is fed to the control panel 92 to keep the inside of the control panel 92 under the positive pressure of, for example, 0.5-1 mmAq.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dustproof method for a control panel. For operation control of mechanical devices, such as switchboards and operation panels
Various control panels are used. Some of these control panels are installed in a dusty atmosphere.
For example, a ventilation device for a vehicle tunnel is provided with a dust removal device that sucks and removes dust-containing air in the tunnel, and a control panel is installed near the dust removal device. It is set up in an atmosphere with many. The present invention relates to a dustproof method for such a control panel.

[0002]

2. Description of the Related Art Conventionally, a control panel having a so-called dustproof structure has been used as the above-mentioned control panel. However, such a conventional control panel cannot reliably prevent dust from actually entering the control panel when it is installed in an atmosphere with a lot of dust. For example, in the case of an operation panel installed on a ventilation wind path provided with a dust removal device for an automobile tunnel as described above, a space between a casing of the operation panel and a lid thereof, an insertion port of a cord into the casing, and the like are sealed with packing. However, in practice, it is not possible to reliably prevent dust from entering the operation panel. Dust enters the operation panel,
If it adheres to a contact or a circuit of an electric component, the main component is carbon, so that a current is short-circuited and control becomes impossible.
Above all, this operation panel allows workers to enter the ventilation
It is operated when checking, repairing, replacing parts, etc. of the dust removing device. However, if it becomes out of control, there is a risk of causing a serious accident.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is that the conventional control panel, when installed in a dusty atmosphere, ensures that dust enters the control panel. Cannot be prevented.

[0004]

SUMMARY OF THE INVENTION The present invention, which solves the above-mentioned problems, is directed to a method for preventing dust from a control panel installed in a dusty atmosphere, comprising supplying pressurized air to the control panel. The method according to the present invention relates to a dustproof method for a control panel, wherein

In the present invention, pressurized air is supplied to the control panel,
The inside of the control panel is kept under a lifting pressure, that is, under a positive pressure with respect to the atmospheric pressure. By keeping the inside of the control panel under elevated pressure, it is possible to reliably prevent dust from entering the control panel even when the control panel is placed in a dusty atmosphere. INDUSTRIAL APPLICABILITY The present invention can be applied to various control panels such as a switchboard, an operation panel, and the like installed in various places in a dusty atmosphere. The effect is high. Despite the fact that the dust concentration in the atmosphere is high, so to speak, it is a closed system airway, it reliably prevents dust from entering the operation panel, operates it correctly, and ensures the safety of workers in particular. Because you can do it.

When the present invention is applied to an operation panel installed in a ventilation wind path provided with a dust removing device for an automobile tunnel, it is not necessary to separately provide a means for supplying pressurized air to the operation panel. This dust removal device is usually blown with pressurized air when regenerating the dust removal part, the electrode plate if it is an electric dust collector, or the filter media if it is a filtration dust collector, This is because the blower or the compressor for supplying the pressurized air is set, and the pressurized air can be supplied to the operation panel using the blower or the compressor. The pressurized air supplied to the control panel including such an operation panel is preferably dehumidified due to its properties, for example, the depressurized air from which the retained moisture is removed by condensation due to cooling.

[0007]

FIG. 1 is a longitudinal sectional view schematically showing a dustproof method for a control panel according to the present invention. Here, a dustproofing method for an operation panel installed on a ventilation wind path provided with a dust removing device for an automobile tunnel is shown. A band-shaped filter 21 is arranged so as to block the ventilation air passage 11 connected to a not-shown automobile tunnel, and the band-shaped filter 21 is wound around a plurality of rotating rolls 31 in a meandering manner. Regeneration chambers 32 and 33 are formed in the upper and lower portions of the ventilation air duct 11 facing the belt-shaped filter 21 wound in a meandering shape.
2, 33 are equipped with drive drums 34, 35,
The band-shaped filter 21 is wound up and down by the upper and lower drive drums 34 and 35. Regeneration rooms 32, 33
Are provided with air injection nozzles 41 and 42 facing the band-shaped filter 21 before being wound on the drive drums 34 and 35. The air injection nozzles 41 and 42 have valves 51 and 42, respectively.
An air supply blower 61 is connected via 52. The outlets 36 and 37 are opened in the regeneration chambers 32 and 33, and the outlets 36 and 37 are connected to an exhaust blower 63 via valves 53 and 54 and a bag filter 62.

An electric dust collecting portion 71 is arranged upstream of the meandering band-shaped filter 21 so as to block the ventilation air passage 11, and faces the electric dust collecting portion 71.
A storage chamber 72 is formed at a lower portion of the storage chamber. A discharge port 73 is opened in the storage chamber 72, and the discharge port 73 is provided with the valve 5.
5 and to the exhaust blower 65 via the bag filter 64.

A first row damper 81 for opening and closing the ventilation air passage 11 is disposed further upstream of the electric dust collecting section 71, and the belt-shaped filter 21 wound in a meandering shape and the electric dust collecting section 71 are arranged. A second row damper 8 that opens and closes the ventilation air passage 11
2, the first row damper 81 and the second row damper 82 are each composed of a plurality of dampers arranged in one row. Then, the second row damper 82 and the electric dust collector 71
And the air injection nozzle 83 facing the electrostatic precipitator 71.
Is disposed, and the air injection nozzle 83 has the valve 56.
Is connected to the compressor 66 via the.

An operation panel 92 is provided downstream of the band filter 21.
Is installed. The operation panel 92 includes a casing 93 and a lid 94 attached to the casing 93. The casing 93 contains electric components and circuits for controlling the operations of the driving drums 34 and 35 and the like. A compressor 66 is connected to the casing 93 via a cooler 91 and a valve 57, and air pressurized by the compressor 66 and dehumidified by the cooler 91 is supplied to the operation panel 92.
It is held under a lifting pressure of ~ 1 mmAq. The pressure in the operation panel 92 may be a positive pressure with respect to the atmospheric pressure.
Needless to say, the above may be adopted.

To remove dust-containing air sucked into the ventilation air passage 11 from a not-shown automobile tunnel, the first-row damper 81 and the second-row damper 82 are opened, and the electric dust collector 71 and the driving drum are opened. By operating 34 and 35, dust-containing air is subjected to dust removal processing by the electric dust collecting unit 71 and the band-shaped filter 21. The band-shaped filter 21 uses the driving drums 34, 3
By blowing pressurized air from the air injection nozzles 41 and 42 onto the surface while winding in the forward and reverse directions at 5, the air is constantly regenerated, but the electric dust collecting unit 71 is not regenerated in the same manner. When reproducing this, the first row damper 8
The first and second row dampers 82 are closed, the operation of the electrostatic precipitator 71 is stopped, and the compressed air is blown from the air injection nozzle 83 to the surface of the electrode plate to regenerate. Thus, during the dust removal processing of the dust-containing air, and during the regeneration processing of the electric precipitator 71,
As described above, the inside of the operation panel 92 is always kept under the lifting pressure. Periodically or in case of any abnormality, the band filter 2
When it is necessary to inspect, repair, or replace parts of the electric dust collecting section 1 and the electric dust collecting section 71, the first row damper 81 is closed and the operation of the driving drums 34 and 35 and the electric dust collecting section 71 is stopped. Enters the ventilation wind path 11 and operates the operation panel 92 to perform work.

[0012]

As is apparent from the above description, the present invention described above has an effect that dust can be reliably prevented from entering the control panel even when the atmosphere is set to a dusty atmosphere.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a dustproof method for a control panel according to the present invention.

[Explanation of symbols]

11 ... ventilation airway, 21 ... strip filter, 32,
33: regeneration chamber, 34, 35: drive drum, 4
1, 42, 83: air injection nozzle, 61: air supply blower, 62, 64: bag filter, 63, 65
..Exhaust blowers, 66 ... compressors, 71 ...
Electric dust collector, 81: first row damper, 82: second
Row damper, 91 ... cooler, 92 ... operation panel

Claims (4)

[Claims] 1. A dustproof method for a control panel installed in a dusty atmosphere, wherein pressurized air is supplied to the control panel and the inside of the control panel is kept under elevated pressure. Dust proof method. 2. The dust-proofing method for a control panel according to claim 1, wherein the control panel is installed in a ventilation wind path provided with a dust removing device for an automobile tunnel. 3. The dust prevention method for a control panel according to claim 2, wherein the blower or the compressor supplies the pressurized air to the control panel from the blower or the compressor for regenerating the dust removing section of the dust removing device. 4. The dustproof method for a control panel according to claim 1, wherein dehumidified pressurized air is supplied to the control panel.