JP2546748B2 - Gas curtain 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. Curtain purge nozzle 1 having a buffer nozzle for forming a gas curtain of an inert gas in its part
In addition, the exhaust fan 3 is provided at the exhaust port 11 provided on the other side of the dustproof hood 10, and the intermittent hood 10 for increasing the internal pressure of the hood is provided in the dustproof hood 10 between the exhaust port 11 and the optical device 9. To provide. 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 inner wall 38 is provided inside, and the gas reservoir 5 is provided around the exhaust port 11.

[0005]

1 shows a gas curtain type purging device in a dustproof hood for optical equipment according to an embodiment of the present invention, FIGS. 3 and 4 show a curtain purging nozzle 1, and FIGS. 5 and 6 show hood internal pressure. 1 shows an intermittent ascending purge nozzle 2 for rising. A base end of a dustproof hood 10 surrounding a lens is attached to an optical device 9 composed of an industrial television camera, and a buffer nozzle 20 for forming a curtain of an inert gas is provided on the front upper portion of the dustproof hood 10. The curtain purge nozzle 1 is arranged and fixed so as to extend in the left-right direction, and is attached to the lower front part of the dustproof hood 10.
A discharge port 11 extending in the left-right direction is provided at a position facing the curtain purge nozzle 1, and a gas reservoir 5 that surrounds the entire circumference of the discharge port 11 is provided under the dustproof hood 10.
Is provided, the inner wall 38 for each application is fixed between the gas reservoir 5 and the optical device 9, and the intermittent purge nozzle 2 for increasing the hood internal pressure is provided at the lower base end of the dustproof hood 10. It is fixed.

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 nozzle for increasing the hood internal pressure. 2 is connected to both ends of the discharge pipe 13, and a pressure instruction 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 surrounding a lens is attached to an optical device 9 composed of an industrial television camera, and a buffer nozzle 20 for forming a curtain of an inert gas is provided in an upper part in the middle of the dustproof hood 10. A curtain purge nozzle 1 is arranged and fixed so as to extend in the left-right direction, and a discharge port 1 that extends in the left-right direction at a position facing the curtain purge nozzle 1 is provided in a lower middle portion 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 an inner wall 38 for each application is fixed between the gas reservoir 5 and the optical device 9, and at the lower end of the dustproof hood 10 at the base end. ,
The intermittent purge nozzle 2 for increasing the hood internal pressure is fixed.

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. Is connected to both ends of the intermittent purge nozzle 2 for use, and a pressure instruction adjusting device 16 is provided in a portion of the discharge pipe 13 connected to both ends of the nozzle 2.
Further, the discharge pipe 14 of the blower 7 is connected to both ends of the curtain purge nozzle 1, and a flow rate instruction adjusting device 17 is provided in 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 buffer nozzle 20, a bottom plate 33 is provided with a slit extending along a side plate 34, the side plate 34 is extended to form a flange 21, and an edge portion of the slit in the bottom plate 33. An inner wall plate 19 extending along the inner wall plate 19 is disposed in the buffer nozzle 20 and is fixed to the bottom plate 33 and both end plates 35 of the buffer nozzle 20. The inner wall plate 19 is extended and parallel to the flange 21. Flange 36 located at
Formed with a pair of flanges 2 facing each other with a small gap
The injection port 22 is provided between the nozzles 1 and 36 to configure the curtain purge nozzle 1.

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. Also, openings 37 are provided in the end plates 35 at both ends of the buffer nozzle 20, and the discharge pipe 14 is connected thereto.

FIG. 5 and FIG. 6 show the structure of the intermittent purge nozzle 2 for increasing the internal pressure of the hood, in which the inner pipe 24 and the outer pipe 25 are concentrically arranged and a connecting member (not shown) is provided. A plurality of injection slits 26 extending in the longitudinal direction of the outer pipe are provided in a portion of the outer pipe 25 which is connected through the outer pipe 25 and is disposed in the dustproof hood, and between the inner pipe 24 and the outer pipe 25. The discharge pipe 13 is connected to. Only when the internal pressure of the discharge pipe 13 exceeds a certain level, the valve 4
The intermittent purge is realized by opening 0 and closing it immediately. Further, in order to prevent the uneven pressure distribution as shown in FIG. 7, discharge pipes 14 are connected to both ends of the curtain purge nozzle 1, and discharge pipes 13 are connected to both ends of the intermittent purge nozzle 2 to form an inner pipe. Discharge pipe 13 than the outer diameter of 24
The inner diameter of is set large. 8 and 9 show the shape of the inner wall 38 for each application. In order to minimize the area of the opening 41, the inner wall for the camera is opened only for the camera field of view, and the inner wall for the laser is a laser line. Open only the width. Further, in order to enhance the exhaust effect, the end of the inner wall has an angle θ.

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, a curtain of inert gas is formed in the dustproof hood 10, and the inert gas is blown into the dustproof hood 10 also from the intermittent purge nozzle 2. Since the pressure inside the gas curtain becomes high, the gas curtain will not be broken even if the atmospheric pressure on the outside of the gas curtain rises slightly, so the atmosphere pressure will change slightly. When the dustproof hood with the gas curtain type purging device is attached to the industrial TV camera used in, the dust and gold in the atmosphere It can be steam or the like is prevented from entering the dust-proof 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 A curtain is formed by the gas inside the furnace, and the gas inside the furnace is blown into the dustproof hood 10 from the intermittent purge nozzle 2 as well, so that the pressure inside the gas curtain becomes high, so the atmospheric pressure outside the gas curtain. The gas curtain will not be broken even if the temperature rises a little, so the dustproof hood with the gas curtain type purging device will be attached to the industrial TV camera used in a steel mill or factory where the atmospheric pressure changes a little. When installed, dust and metal vapor in the atmosphere prevent dust hood 1.
It is possible to prevent intrusion into 0.

Even if dust passes through the gas curtain and enters the optical device 9, the invasion is blocked by the inert gas injected from the inner wall 38 and the intermittent purge nozzle 2. Moreover, the dust that has entered the discharge port 11 is discharged by the discharge fan 3 and the blower 7 (the blower 2 in FIG. 2).
8) by the suction force of the blower 7 (in FIG. 2, the blower 2
Since it is transferred toward 8) and filtered by the filter 8, clean inert gas is injected from the curtain purge nozzle 1.

Further, a gas reservoir 5 provided for safety
Can accumulate a certain amount of blown gas, and the flow rate balance can be visually confirmed by the flow rate indicator adjusting devices 6 and 17. Furthermore, the outlet 11
Since the gas in the dustproof hood 10 is forcibly discharged by the exhaust fan 3 provided in the above, the blowing amount does not exceed the discharging amount.

Since the inert gas is circulated in the gas curtain type purging apparatus of the present invention, it can be installed in a high temperature part such as a heating furnace, and is therefore 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, the intermittent hood internal pressure increasing purge nozzle 2 and the inner wall 38 are provided in the dustproof hood 10 between the exhaust port 11 and the optical device 9, a gas that is strong against the external atmospheric pressure is provided. A curtain can be formed, and therefore, invasion of dusts into the dustproof hood 10 can be effectively prevented. In addition, the discharge pipe 1 of the blower 7
By connecting 4 to both ends of the curtain purge nozzle 1, the pressure distribution of the inert gas injected from the curtain purge nozzle 1 is made uniform as compared with the air pressure distribution injected from the blowing port in the conventional dustproof nozzle. By providing the inner wall 38 between the discharge port 11 and the optical device and by providing the gas reservoir 5 around the discharge port 11, it is possible to reliably prevent dust from entering the dustproof hood 10. be able to. 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 perspective view of an inner wall for a camera.

FIG. 8 is a perspective view of an inner wall for laser.

FIG. 9 is a diagram showing a pressure distribution at a blow-in port in a conventional dustproof hood.

[Explanation of symbols]

 1 Curtain Purge Nozzle 2 Intermittent Purge Nozzle for Raising Hood Internal Pressure 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 Suction Port 12 Suction Pipe 13 Discharge Pipe 14 Discharge Pipe 15 Inert Gas Supply Port 16 Pressure Indication Adjusting Device 17 Flow Rate Indication Adjusting 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 Adjustment 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 38 Inner wall 39 Detector 40 Solenoid valve 41 Opening

Claims (4)

(57) [Claims] 1. A curtain purge nozzle 1 having a buffer nozzle 20 for forming a gas curtain of an inert gas is provided on one side of a dustproof hood 10 mounted on a front portion of an optical device 9, and the dustproof hood 10 is provided. A discharge port 11 is provided on the other side of the hood 10 at a position facing the curtain purge nozzle 1, and a discharge fan 3 is provided in the discharge port 11 so that a space between the discharge port 11 and the optical device 9 is provided. Is provided with an intermittent purge nozzle 2 for increasing the internal pressure of the hood and an inner wall 38, the suction pipe 12 of the blower 7 is connected to the discharge port 11, and the discharge pipe 13 of the blower 7 is connected to the intermittent purge nozzle 2. The discharge pipe 14 of the blower 7 is connected to both ends of the curtain purge nozzle 1.
1. A gas curtain type purging device in a dustproof hood for optical equipment, in which an inert gas supply port 15 is provided in the suction pipe 12 or the discharge pipe. 2. A curtain purge nozzle 1 having a buffer nozzle 20 for forming a gas curtain of an inert gas is provided on one side of a dustproof hood 10 mounted on the front part of an optical device 9, and the dustproof hood 10 is provided. On the other side of the hood 10, at a position facing the curtain purge nozzle 1,
The exhaust port 11, the gas reservoir 5 and the exhaust fan 3 are provided, the inner wall 38 is provided between the gas reservoir 5 and the optical device 9, and the hood internal pressure is provided between the inner wall 38 and the optical device 9. An ascending purge purge nozzle 2 for rising is provided, a suction pipe 12 of a blower 7 is connected to the discharge port 11, a discharge pipe 13 of the blower 7 is connected to the intermittent purge nozzle 2, and a discharge pipe 14 of the blower 7 is the curtain. A gas curtain type purging device in a dustproof hood for an optical device, which is connected to the purge nozzle 1 and has an inert gas supply port 15 provided in the suction pipe 12 or the discharge pipe of the blower 7. 3. The in-furnace gas circulation curtain type purging apparatus has a buffer nozzle 20 for forming a gas curtain of an inert gas 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, and a discharge port 11 is provided on the other side of the dustproof hood 10 at a position facing the curtain purge nozzle 1.
Is provided, an exhaust fan 3 is provided in the exhaust port 11, an intermittent hood internal pressure increasing purge nozzle 2 is provided between the exhaust port 11 and the optical device 9, and a suction pipe 12 of the blower 7 is provided. Dustproof for optical equipment, which is connected to the in-furnace gas extraction part 30, the discharge pipe 13 of the blower 7 is connected to the intermittent purge nozzle 2, and the discharge pipe 14 of the blower 7 is connected to both ends of the curtain purge nozzle 1. Furnace gas circulation curtain type purging device in the hood. 4. The in-furnace gas circulation curtain type purging device has a buffer nozzle 20 for forming a gas curtain of in-furnace gas 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, and a discharge port 11 is provided on the other side of the dustproof hood 10 at a position facing the curtain purge nozzle 1.
A gas reservoir 5 and an exhaust fan 3 are provided, an inner wall 38 is provided between the gas reservoir 5 and the optical device 9, and an intermittent hood internal pressure increasing mechanism is provided between the inner wall 38 and the optical device 9. The purge nozzle 2 is provided, the suction pipe 12 of the blower 7 is connected to the in-furnace gas outlet 30, the discharge pipe 13 of the blower 7 is connected to the intermittent purge nozzle 2, and the discharge pipe 14 of the blower 7 is the curtain purge nozzle. A furnace gas circulation curtain type purging device in a dustproof hood for optical equipment connected to 1.