JP2512346B2 - Gas curtain type purging device in dustproof hood for optical equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas curtain type purging device in a dustproof hood which is attached to optical equipment such as industrial television cameras and optoelectronic switches used in steelworks and chemical plants.

[0002]

2. Description of the Related Art Conventionally, as a dustproof hood mounted on an optical device, an air curtain with air is provided in the middle of the hood mounted on the optical device as disclosed in Japanese Patent Laid-Open No. 55-48739. A blow port for forming and a suction port facing the blow port are provided, and while reducing the amount of air blown from the blow port, the blow port is increased so that the amount of air sucked from the blow port is increased. The air outlet is formed to be larger than that of the air blower, the air blower pipe connected to the blower outlet and the air blower pipe connected to the air outlet are connected to a blower, and the air is circulated by the blower to form an air curtain in the hood. Structures configured to form are known.

[0003]

In the case of the above-mentioned conventional dustproof hood for chemical equipment, since air is circulated, it is extremely dangerous to use it in a high temperature part such as near a heating furnace, and one air curtain is used. Since it is dust-proof only by itself, if the atmospheric pressure on the outside of the air curtain increases, the air curtain may be broken and dust may enter the hood. Further, since the suction capacity depends only on the blower, there is a concern that when the blow rate increases, the blow rate becomes larger than the blow rate. Furthermore, as shown in FIG. 7, since the blower pipe is connected to one end of the blow-in port, the pressure distribution in the lengthwise direction of the blow-in port changes greatly and turbulence occurs, which deteriorates the performance of the air curtain. Therefore, in the case of the conventional dustproof hood for optical equipment, dust invades into the hood and adheres to the glass surface of the optical equipment, causing the glass surface to fog.
There is a risk of erroneous operation.

[0004]

According to the present invention, one side of the dustproof hood 10 is provided in order to ensure safety even when used in a high temperature part and to reliably prevent dust from entering the dustproof hood. 1 is provided with a curtain purge nozzle 1 having a large capacity outer tube for forming a gas curtain of an inert gas, and an exhaust fan 3 is provided at an exhaust port 11 provided on the other side of the dustproof hood 10. A nozzle 2 for raising the hood internal pressure is provided in the dustproof hood 10 between the discharge port 11 and the optical device 9. Further, in order to make the pressure of the inert gas injected from the curtain purge nozzle 1 uniform, the discharge pipe 14 of the blower 7 is connected to both ends of the curtain purge nozzle 1, and dusts enter the dustproof hood 10. In order to reliably prevent the above, the partition plate 4 is provided in the dustproof hood 10, and the gas reservoir 5 is provided around the discharge port 11.

[0005]

1 shows a gas curtain type purging device in a dustproof hood for an optical device according to an embodiment of the present invention, FIGS. 3 and 4 show a curtain purging nozzle 1, and FIGS. 5 and 6 show an increase in internal pressure. The nozzle 2 is shown. A base end of a dustproof hood 10 that surrounds the lens is attached to an optical device 9 composed of an industrial television camera, and a large-capacity outer tube 20 for forming a curtain of inert gas is provided on the front upper portion of the dustproof hood 10. A curtain purge nozzle 1 having the above is arranged and fixed so as to extend in the left-right direction, and a discharge port 1 extending in the left-right direction at a position facing the curtain purge nozzle 1 at a lower portion in front of the dustproof hood 10.
1 is provided, and at the bottom of the dustproof hood 10, a discharge port 1
1 is provided with a gas reservoir 5 surrounding the entire circumference thereof, and a partition plate 4 protruding upward is fixed to the upper edge of the gas reservoir 5 on the optical device 9 side.
A nozzle 2 for increasing the hood internal pressure is fixed to the lower base end of the.

A plurality of discharge fans 3 are provided in the discharge port 11.
, The suction pipe 12 of the blower 7 is connected to the discharge port 11, the suction pipe 12 is provided with a filter 8 and a flow rate indicator adjusting device 6, and the discharge pipe 13 of the blower 7 is a hood internal pressure increasing nozzle. 2 is connected to both ends of the discharge pipe 13, and a flow rate indicator adjusting device 16 is provided at a portion of the discharge pipe 13 connected to both ends of the nozzle 2. The discharge pipe 14 of the blower 7 is connected to both ends of the curtain purge nozzle 1. Is
Further, the curtain purge nozzle 1 in the discharge pipe 14
A flow rate indicator adjusting device 17 is provided at a portion connected to both ends of the. The discharge pipe 14 is provided with an inert gas supply port 15 having a control valve 27, and an inert gas such as nitrogen gas is supplied from the inert gas supply port 15. The tip of the dustproof hood 10 is connected to, for example, a monitoring hole of the heating furnace 18.

FIG. 2 shows a gas circulation curtain type purging device in a dustproof hood for optical equipment which uses the gas in the furnace according to an embodiment of the present invention. A base end of a dustproof hood 10 that surrounds the lens is attached to an optical device 9 composed of an industrial television camera, and a large-capacity outer tube 20 for forming a curtain of an inert gas is provided in the upper middle part of the dustproof hood 10. The curtain purge nozzle 1 having the above is arranged and fixed so as to extend in the left-right direction, and a discharge port 11 extending in the left-right direction at a position facing the curtain purge nozzle 1 is provided at a lower portion in the middle of the dustproof hood 10. A gas reservoir 5 is provided below the dustproof hood 10 and surrounds the entire circumference of the discharge port 11, and a partition protruding upward is provided at the upper edge of the gas reservoir 5 on the optical device 9 side. The plate 4 is fixed, and the hood internal pressure increasing nozzle 2 is fixed to the lower base end of the dustproof hood 10.

A plurality of discharge fans 3 are provided in the discharge port 11.
And the suction pipe 32 of the blower 28 is connected to the outlet 11
The gas in the discharge port 11 is returned to the heating furnace 18 from the discharge part 31 through the discharge pipe 29 of the blower 28.

Further, the suction pipe 12 of the blower 7 is connected to the in-furnace gas take-out section 30, the suction pipe 12 is provided with a filter 8 and a flow rate indicator adjusting device 6, and the discharge pipe 13 of the blower 7 has an increased hood internal pressure. A flow rate indicator adjusting device 16 is provided at a portion of the discharge pipe 13 connected to both ends of the nozzle 2 and connected to both ends of the nozzle 2, and the discharge pipe 14 of the blower 7 is provided at both ends of the curtain purge nozzle 1. Further, a flow rate indicator adjusting device 17 is provided at a portion of the discharge pipe 14 connected to both ends of the curtain purge nozzle 1. The tip of the dustproof hood 10 is connected to, for example, a monitoring hole of the heating furnace 18.

3 and 4 show a curtain purge nozzle 1
In the bottom plate 33 of the large-capacity outer tube 20, a slit extending along the side plate 34 is provided, the side plate 34 is extended to form the flange 21, and the slit of the bottom plate 33 is formed. The inner wall plate 19 extending along the edge portion is arranged in the large-capacity outer pipe 20, and is fixed to the bottom plate 33 and the end plates 35 on both sides of the large-capacity outer pipe 20, and the inner wall plate 19 is extended. A curtain 36 is formed by forming a flange 36 arranged in parallel with the flange 21 and providing an injection port 22 between a pair of flanges 21 and 36 facing each other with a small interval.

A large number of injection port width adjusting screws 23, which are arranged at intervals in the longitudinal direction of the flange, are inserted into the respective flanges 21 and 36, and the pressure of the inert gas injected from the injection port 22 is changed to the curtain purge nozzle. The distance between the flanges 21 and 36 is adjusted by a large number of screws 23 so that the flow rate of the gas injected from the injection port 22 is uniform over the entire length L of the injection port 1 and is constant over the entire length of the injection port 22. To be done. In addition, the end plates 3 at both ends of the large capacity outer pipe 20.
5, an opening 37 is provided, and the discharge pipe 14 is provided.
Is connected.

5 and 6 show the structure of the nozzle 2 for increasing the internal pressure of the hood, in which the inner pipe 24 and the outer pipe 25 are arranged concentrically and via a connecting member (not shown). A large number of injection slits 26 extending in the longitudinal direction of the outer pipe are provided in a portion of the outer pipe 25 that is connected and arranged in the dustproof hood, and further discharges between the inner pipe 24 and the outer pipe 25. The pipe 13 is connected. Further, in order to prevent the uneven pressure distribution as shown in FIG. 7, the discharge pipe 14 is connected to both ends of the curtain purge nozzle 1, the discharge pipe 13 is connected to both ends of the nozzle 2, and the inner pipe 24 is The inner diameter of the discharge pipe 13 is set to be larger than the outer diameter.

In the gas curtain type purging device in the dustproof hood of the present invention, when the blower 7 is operated, the exhaust fan 3 is rotated, and the inert gas is supplied from the inert gas supply port 15, the inert gas is discharged. Is blown from the curtain purge nozzle 1 toward the discharge port 11 to form a curtain of inert gas in the dustproof hood 10, and the inert gas is blown from the nozzle 2 into the dustproof hood 10 as well. Since the internal pressure of the gas becomes high, the gas curtain will not be broken even if the atmospheric pressure on the outside of the gas curtain becomes slightly higher, so it is used in steelworks or factories with bad atmosphere where the atmospheric pressure changes slightly. When a dustproof hood equipped with the gas curtain type purging device is attached to an industrial television camera, the dust and metal vapor in the atmosphere are protected. It can be prevented from entering the hood 10.

In the purging device for circulating gas in the furnace in the dustproof hood of the present invention, the blower 7 and the blower 28 are used.
When the exhaust fan 3 is rotated and the in-furnace gas is replenished from the in-furnace gas extraction part 30, the in-furnace gas is blown from the curtain purge nozzle 1 toward the exhaust port 11, and the dustproof fan 10 Since the curtain is formed inside by the gas inside the furnace, and the gas inside the furnace is blown into the dustproof hood 10 from the nozzle 2 as well, the pressure inside the gas curtain becomes high, so that the atmospheric pressure outside the gas curtain is somewhat increased. Even if it gets higher, the gas curtain will not be broken, so the atmospheric pressure will change somewhat, and the dustproof hood with the gas curtain type purge device is attached to the industrial TV camera used in a steel mill or factory where the atmosphere is bad. In this case, it is possible to prevent dust and metal vapor in the atmosphere from entering the dustproof hood 10.

Even if dust passes through the gas curtain and enters the optical device 9, the invasion is blocked by the inert gas ejected from the partition plate 4 and the nozzle 2. Also, the dust that has entered the discharge port 11 will not be discharged by the discharge fan 3
Further, the suction force of the blower 7 (in FIG. 2, blower 28) transfers the blower 7 toward the blower 7 (in FIG. 2, blower 28) and the filter 8 filters the clean inert gas from the curtain purge nozzle 1. Is jetted.

Further, a gas reservoir 5 provided for safety
Is capable of accumulating a certain amount of blown gas, and the flow rate balance can be visually confirmed by the flow rate control devices 6, 16 and 17. Furthermore, since the gas in the dustproof hood 10 is forcibly discharged by the discharge fan 3 provided at the discharge port 11, the blown amount does not exceed the discharged amount.

In the air curtain type purging apparatus of the present invention, since the inert gas is circulated, it can be installed in a high temperature part such as a heating furnace, which is effective for use in a steel mill or a chemical factory. .

[0018]

According to the present invention, since the inert gas or the in-furnace gas is injected from the curtain purge nozzle 1 having a large-capacity outer tube to form a gas curtain, the dustproof hood 1
It is safe to use the optical device 9 equipped with 0 in a high temperature part, and the discharge port 11 facing the curtain purge nozzle 1
Since the exhaust fan 3 is provided in the above, and the hood internal pressure increasing nozzle 2 is provided in the dustproof hood 10 between the exhaust port 11 and the optical device 9, it is possible to form a gas curtain that is strong against the external atmospheric pressure. Therefore, it is possible to effectively prevent dust from entering the dustproof hood 10. Further, by connecting the discharge pipe 14 of the blower 7 to both ends of the curtain purge nozzle 1, the pressure distribution of the inert gas injected from the curtain purge nozzle 1 is changed to the air pressure distribution injected from the blowing port of the conventional dustproof nozzle. In comparison, the partition plate 4 is provided on the optical device side of the discharge port 11 and the gas reservoir 5 is provided around the discharge port 11 so that dust can enter the dustproof hood 10. Can be reliably prevented. Further, in the case of the gas curtain type purging device by circulating the gas in the furnace, the supply of the inert gas is unnecessary, which is economically advantageous.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a gas curtain type purging device in a dustproof hood for an optical device.

FIG. 2 is a vertical cross-sectional side view of a gas curtain type purging device by circulating gas in a furnace.

FIG. 3 is a perspective view of a curtain purge nozzle.

FIG. 4 is a sectional view of a curtain purge nozzle.

FIG. 5 is a perspective view of a nozzle for increasing the internal pressure of the hood.

FIG. 6 is a cross-sectional view of a hood internal pressure increasing nozzle.

FIG. 7 is a diagram showing a pressure distribution of a blow-in port in a conventional dustproof hood.

[Explanation of symbols]

 1 Curtain Purge Nozzle 2 Nozzle for Raising Inner Pressure of Hood 3 Discharge Fan 4 Partition Plate 5 Gas Reservoir 6 Flow Rate Control Device 7 Blower 8 Filter 9 Optical Equipment 10 Dustproof Hood 11 Discharge Port 12 Suction Pipe 13 Discharge Pipe 14 Discharge Pipe 15 No Active gas supply port 16 Flow rate control device 17 Flow rate control device 18 Heating furnace 19 Inner wall plate 20 Large capacity outer pipe 21 Flange 22 Injection port 23 Injection port width adjusting screw 24 Inner pipe 25 Outer pipe 26 Injection slit 27 Control valve 28 Blower 29 Discharge pipe 30 In-furnace gas extraction part 31 In-furnace gas discharge part 32 Suction pipe 33 Bottom plate 34 Side plate 35 End plate 36 Flange 37 Opening

Claims (4)

(57) [Claims] 1. A curtain purge nozzle 1 having a large-capacity outer tube for forming a gas curtain of an inert gas is provided on one side of a dustproof hood 10 mounted on a front part of an optical device 9, A discharge port 11 is provided on the other side of the dustproof hood 10 at a position facing the curtain purge nozzle 1, and a discharge fan 3 is provided in the discharge port 11.
Is provided, a nozzle 2 for increasing the internal hood pressure is provided between the discharge port 11 and the optical device 9, and the suction pipe 1 of the blower 7 is provided.
2 is connected to the discharge port 11, and the discharge pipe 13 of the blower 7
Is connected to the nozzle 2, the discharge pipe 14 of the blower 7 is connected to both ends of the curtain purge nozzle 1, and the suction pipe 12 or the discharge pipe of the blower 7 is provided with an inert gas supply port 15. Gas curtain type purging device inside the dustproof hood. 2. A curtain purge nozzle 1 having a large-capacity outer tube for forming a gas curtain of an inert gas is provided on one side of a dustproof hood 10 mounted on a front part of an optical device 9, On the other side of the dustproof hood 10, at the position facing the curtain purge nozzle 1, the discharge port 11
A gas reservoir 5 and an exhaust fan 3 are provided, a partition plate 4 is provided between the gas reservoir 5 and the optical device 9, and a pressure inside the hood increases between the partition plate 4 and the optical device 9. Nozzle 2 is provided, and the suction pipe 12 of the blower 7 is connected to the discharge port 1
1, the discharge pipe 13 of the blower 7 is connected to the nozzle 2, the discharge pipe 14 of the blower 7 is connected to the curtain purge nozzle 1, and the suction pipe 12 or the discharge pipe of the blower 7 is supplied with an inert gas supply port. 15. A gas curtain type purging device in a dustproof hood for optical equipment provided with 15. 3. In the in-furnace gas circulation curtain type purging device, a large-capacity outer tube for forming a gas curtain of an inert gas is provided on one side of the dustproof hood 10 mounted on the front part of the optical device 9. A curtain purge nozzle 1 is provided, a discharge port 11 is provided on the other side of the dustproof hood 10 at a position facing the curtain purge nozzle 1, and a discharge fan 3 is provided in the discharge port 11. A nozzle 2 for increasing the pressure inside the hood is provided between the discharge port 11 and the optical device 9, the suction pipe 12 of the blower 7 is connected to the in-furnace gas extraction unit 30, and the discharge pipe 13 of the blower 7 is connected to the nozzle 2. A furnace gas circulation curtain type purging device in a dustproof hood for optical equipment, which is connected and discharge pipes 14 of the blower 7 are connected to both ends of the curtain purging nozzle 1. 4. In the furnace gas circulation curtain type purging device, a large-capacity outer tube for forming a gas curtain by the furnace gas is provided on one side of the dustproof hood 10 mounted on the front part of the optical device 9. The curtain purge nozzle 1 is provided, and the other side portion of the dustproof hood 10 is provided with an exhaust port 11, a gas reservoir 5, and an exhaust fan 3 at a position facing the curtain purge nozzle 1, and a gas reservoir. 5 and an optical device 9 are provided with a partition plate 4, a partition plate 4 and the optical device 9 are provided with a nozzle 2 for increasing the internal pressure of the hood, and the suction pipe 12 of the blower 7 is connected to the gas outlet of the furnace. 30, the discharge pipe 13 of the blower 7 is connected to the nozzle 2, and the discharge pipe 14 of the blower 7 is connected to the curtain purge nozzle 1. apparatus.