JPS595789Y2 - Vent opening/closing device - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for opening and closing a vent passage in a converter factory.

Converter factories generate a lot of dust in a high-temperature atmosphere.

In particular, when pouring hot metal into a converter, when slopping occurs during operation, and when tapping steel after blowing, a large amount of dust and hot air are generated at once, and the ventilation openings of the factory
It scatters outside the factory through the skylights and significantly deteriorates the environment.

In such cases, it is effective to collect dust by blocking ventilation holes such as ventilation holes or skylights.

However, attaching an opening/closing device to a vent where such a large amount of dust and hot air rises requires extremely large-scale equipment, and there are also problems such as frequent breakdowns due to the large amount of dust and hot air.

This invention was created in response to these problems and is a simple device that does not cause malfunctions due to dust, etc., and provides an easy-to-operate opening/closing device that is fixed to the side wall of the vent passage. A side plate is provided, a membrane bag of a size that covers the vent passage is attached to the fixed side plate, an air supply/exhaust pipe for supplying and discharging gas to and from the membrane bag is provided on the side plate, and an air curtain is installed at the tip of the membrane bag. It has a small diameter hole for use.

The following will be explained based on the drawings.

FIG. 1 is a cross-sectional view showing an example of this invented switchgear installed in a vent passage of a converter factory, FIG. 2 is a plan view of the same embodiment, and FIG. 3 is an enlarged view thereof.

1 is a converter, and 2 is a vent passage.

Reference numeral 3 denotes a fixed side plate of this invented opening/closing device, which is provided on the side wall of the vent passage 2.

A membrane bag 4 is attached to this side plate 3.

This membrane bag 4 is large enough to cover the vent passage 2,
From the viewpoint of strength, it is advantageous to have a triangular cross section, but it may also be flat.

Furthermore, although canvas or the like is used as the film, it may also be made of vinyl, chemical fiber, or the like.

However, if hot air or dust is generated, a heat-resistant coating should be used.

Reference numeral 5 denotes a supply/exhaust pipe for supplying and discharging gas to and from the membrane bag 4.

When gas is fed into the membrane bag 4 from this supply/exhaust pipe, it swells and the vent passage becomes closed, but when gas is discharged, the membrane bag 4 hangs down and closes the ventilation passage. is in an open state.

11 and 12 are valves for supplying and exhausting air, and 6 is a blower.

That is, the air is fed into and discharged from the membrane bag 4 by operating the blower 6 and the valves 11 and 12.

FIG. 37 shows a compressed air pipe used as an auxiliary in case of rapid blockage.

If slopping occurs during converter operation, it is necessary to quickly close the vent passage.

In such a case, if the supply/exhaust pipe 5 and the compressed air pipe 7 are used together, the vent passageway will be quickly blocked.

Moreover, it goes without saying that it is used when the blower 6 is out of order.

FIG. 38 shows an air curtain nozzle installed in the membrane bag.

This nozzle 8 is for blocking passages in complicated equipment parts in the middle of the process, such as when the blowing lance of the converter is raised and lowered to a high place.

9 in the figure is a lance for blowing, and the nozzle 8 is directed toward this lance 9.
The gas for the air curtain blows out, and the passage is completely blocked by the combination of the membrane bag and the air curtain.

In this way, the invented opening/closing device can completely close and seal even if there is a complicated device in the vent passageway by using a membrane bag and an air curtain in combination.

Reference numeral 10 denotes a curtain. This curtain 10 is provided at the lower part of the membrane bag 4 to guide the flow of rising dust and hot air.

This invented switchgear is constructed as described above, but when the converter is normal, that is, when no dust is generated,
The membrane bag is degassed and the vent passage is open.

Air rising from the converter ascends through the vent passageway 2 and is radiated out of the factory through the skylight of the factory building.

When dust is generated due to converter operation, etc., the blower 6 is operated and the valves 11 and 12 are opened to feed gas into the membrane bag, and the membrane bag 4 is inflated by the gas to close the vent passage.

The dust and hot air rising from the converter are guided in the direction of the arrow by a curtain 10, removed by a dust collector (not shown) installed outdoors, and released outside the factory, so that the dust and the like will not be scattered outside the factory. It is something that will disappear.

As mentioned above, this invented switchgear is simpler than conventional switchgear and does not require much equipment cost.
Since the device has no sliding or rotating parts, there is almost no failure due to dust, etc.

Furthermore, it has many advantages such as being easy to operate and automatically controllable, and even if there is a complicated device in the vent passageway, it can be completely closed by using an air curtain nozzle in combination.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of this invented switchgear;
FIG. 2 is a plan view of the same embodiment, and FIG. 3 is an enlarged view of the same embodiment. 1...Converter, 2...Vent passageway, 3.
... Fixed side plate, 4 ... Film bag, 5 ...
...Air supply and exhaust pipe, 6...Blower, 7...
- Compressed air pipe, 8... Nozzle for air curtain, 9... Lance for blowing, 10... Banner, 11.12... Valve.

Claims (1)

[Scope of utility model registration request] A fixed side plate is provided on the side wall of the upper vent passage of the converter furnace, a membrane bag having a size to cover the passage is attached to the side plate, and an air supply/exhaust pipe for supplying and discharging gas to the membrane bag is provided on the side plate, An opening/closing device for a vent above a converter furnace, further comprising a small diameter hole for an air curtain provided at the tip of the membrane bag.