JP2002087825A - Window for monitoring inside of device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a window for monitoring the inside of a device to be internally monitored which prevents the fogging of a glass pane by the adhesion of metal vapor, particulates, etc., included in the atmosphere in the device and suppresses the crazing by the temperature difference between the front and rear of the glass pane. SOLUTION: This window for monitoring the inside of the device consists of a cylindrical structural member and the circular glass pane mounted at the cylindrical structural member. A spout for gas is installed adjacently to the glass pane and a gas chamber is annexed to the cylindrical structural member. Spirally vanes for imparting swirling flow to the ejected gas are internally disposed in the gas chamber and the window has a cooling jacket annexed to the cylindrical structural member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention monitors the condition of a molten glass ribbon flowing on a float bath filled with a high-temperature molten metal in a device whose inside is monitored, in particular, in a plate glass manufacturing device by a float method. Therefore, the present invention relates to a monitoring window installed inside a float glass manufacturing apparatus on the side wall of the apparatus.

[0002]

2. Description of the Related Art For example, in a glass manufacturing apparatus using a float method, which is one method of a conventional glass manufacturing method, the state of a molten glass ribbon flowing on a float bath filled with a high-temperature molten metal, usually molten tin, is measured. For monitoring, a window for monitoring the inside of the float glass manufacturing apparatus is provided on a side wall of the float glass manufacturing apparatus, through which an operator of the float glass manufacturing apparatus monitors the inside of the apparatus with a camera or directly visually. ing.

[0003] The high temperature inside the apparatus, the presence of molten metal in the float bath inside the apparatus to prevent oxidation of the molten metal, and the presence of vapor or fine particles containing glass or metal as components in the internal atmosphere. Therefore, the float glass manufacturing apparatus has a closed structure, and the monitoring window inside the apparatus has a closed structure.

When the atmosphere containing metal vapor and fine particles inside the float glass manufacturing apparatus comes into contact with the inner surface of the window glass provided at the tip of the monitoring window inside the apparatus, the metal vapor or fine particles adhere to the inner surface of the window glass. By,
There was a problem of fogging the window glass.

[0005] Further, the temperature difference between the inner surface and the outer surface of the window glass may cause the window glass to crack, which hinders monitoring work.

As a solution to the above problem, a monitoring window inside the apparatus is disclosed in Japanese Utility Model Publication No. 46-35254 and Japanese Utility Model Publication No. 57-12400.

[0007] A monitoring device for mounting on a wall of a glass manufacturing apparatus disclosed in Japanese Utility Model Publication No. 46-35254 includes:
A window in a box mounted on the wall of the glass making apparatus and secured over holes in the wall of the apparatus, and a gas isolation curtain across the box to isolate the window from contact with the atmosphere in the apparatus. A first gas supply device having a device coupled to the box away from the window and having a device for directing a gas curtain across the interior of the box, the monitoring device comprising: Between the gas supply device and the window of
A second gas supply device having a connection to a box for supplying gas to the space between the gas curtain and the window and generating a pressure in the space at least greater than the pressure of the atmosphere in the device. It is a structure to do. That is, a hole is made in the side wall of the glass manufacturing apparatus, a box fixed over the hole, a window glass sealing the outer end of the box, and a window glass connected to the box and isolating the window glass from the atmosphere in the glass manufacturing apparatus. An apparatus is disclosed for maintaining a gas curtain across the interior of the box at a location remote from the window glass.

[0008] The apparatus internal monitoring apparatus disclosed in Japanese Utility Model Publication No. 57-12400 discloses an atmosphere inside the apparatus on a side of a monitoring window box with a transparent window plate provided on a side wall of the apparatus whose inside is to be monitored. In a device internal monitoring device in which gas outlets forming a gas curtain for preventing the glass window from adhering to and contaminating the transparent window plate are provided opposite to each other, the gas outlets are provided on the transparent window plate. A guide member for guiding the gas curtain to a position in contact with the transparent window plate on the device side is provided adjacent to the gas outlet on the device side from the gas outlet. A device internal monitoring device provided at opposing positions on an inner wall. That is, by providing a jet port for fogging prevention gas on opposing sides inside the rectangular window body on the device side of the window glass, and jetting the fogging prevention gas from the jet port,
There is disclosed a device for forming a turbulent flow by impinging a fogging prevention gas at a central portion of a window glass on a device side.

[0009]

SUMMARY OF THE INVENTION However, Japanese Utility Model Publication No. 46-35254 and Japanese Utility Model Publication No. 57-12400
In the monitoring window inside the device disclosed in Japanese Patent Application Publication No. JP-A-2005-115, the shape of the monitoring window is square, and for example, a Japanese Utility Model Publication No. 577-1
As shown in FIG. 10 which is a schematic view of the device internal monitoring device disclosed in Japanese Patent Publication No. 2400, viewed obliquely, the fogging prevention gas G is blown out only from two directions in the rectangular window. If the flow rate of the fogging prevention gas G is reduced, the atmosphere inside the apparatus is involved in the gas flow of the fogging prevention gas G, so that the effect of preventing fogging of the window glass cannot be improved. Furthermore,
Since the gas flow is not uniformly applied to the window glass, there is a problem that the gas curtain is not perfect and the window glass is easily fogged by the atmosphere inside the apparatus.

Furthermore, in order to prevent the window glass from cracking due to the temperature difference between the inner surface and the outer surface of the window glass, a large amount of anti-fog gas is required when cooling the window glass. was there.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a monitoring window provided in a wall of a device whose inside is to be monitored, the window being used for monitoring metal vapor and fine particles contained in the atmosphere inside the device. It is an object to provide a monitoring window inside the apparatus, which has an effect of preventing fogging of a window glass due to the above and suppressing cracks due to a temperature difference between an inner surface and an outer surface of the window glass.

The present invention relates to a monitoring window inside a device, which is provided on an outer wall of the device whose inside is to be monitored, and has a gas outlet for preventing contamination of a window glass due to an atmosphere in the device. A window frame made of a cylindrical structural member and a circular window glass attached to the tip of the window frame body, and a gas outlet for preventing contamination of the window glass is provided adjacent to the window glass. A gas chamber is attached to the window frame body, and a spiral blade for giving a swirling flow to the gas to be jetted is provided in the gas chamber. It is.

Further, the present invention is the above-mentioned monitoring window inside the apparatus, comprising a water cooling jacket attached to the window frame.

The monitoring window inside the apparatus according to the present invention comprises a window frame body which is formed by making a hole in a side wall of the apparatus whose inside is to be monitored and fixedly provided.
Instead of a conventional rectangular parallelepiped, it is a cylindrical structural member, and the shape of the window glass at the outer end of the window frame, which is a cylindrical structural member, is circular, and a gas for preventing fogging is provided on the circumference of the window frame. A gas chamber for temporary storage is installed, spiral blades are installed inside the gas chamber, and the fogging prevention gas is swirled from the spout provided on the device side and the inner surface of the window frame when viewed from the window glass. It blows out.

The float bath constituting the float glass manufacturing apparatus is filled with a high-temperature molten metal, usually molten tin, etc. The molten tin is oxidized when in contact with oxygen, and becomes a tin oxide having a melting point higher than that of tin. Therefore, it is necessary to fill the inside of the float device with a non-oxidizing gas, and the inside of the float device is usually in a nitrogen atmosphere.

Therefore, the fogging prevention gas used in the monitoring window inside the apparatus of the present invention is preferably the same gas as the internal atmosphere of the float apparatus, and usually nitrogen is used.

In the monitoring window inside the apparatus according to the present invention, the fogging prevention gas jetted into the window frame becomes a swirling flow and uniformly hits the entire inner surface of the window glass. It is possible to generate a gas curtain for isolation.

In the monitoring window inside the apparatus of the present invention, metal vapor, fine particles and the like contained in the atmosphere inside the sheet glass manufacturing apparatus adhere to the window glass as compared with the conventional rectangular internal monitoring window. The effect of preventing clouding is great,
The life of the window glass, that is, the replacement time, can be greatly extended.

Further, by attaching a cooling jacket to a window frame which is a cylindrical structural member constituting a monitoring window inside the apparatus of the present invention, the window frame itself is cooled and a fogging preventing gas is supplied. The cooling also cools the inner surface of the windowpane, and prevents the occurrence of cracks in the windowpane due to a temperature difference between the inner side and the outer side of the windowpane.

The internal monitoring window of the present invention can be used as long as it has an internal atmosphere that contaminates and foggs the window glass, other than the monitoring window inside the glass manufacturing apparatus by the float method. , Heating furnace, drying furnace, firing path,
Even when used as a monitoring window inside a high-temperature device such as a melting furnace, the effect of preventing the window glass from being contaminated and fogged by the atmosphere in the device is exhibited.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a longitudinal sectional view of an example of a monitoring window inside an apparatus of the present invention, and FIG. 2 is a perspective view of the same monitoring window as FIG. The monitoring window inside the apparatus of the present invention is not limited to the monitoring window of the embodiment shown in FIGS.

An annular gas chamber 3 and annular water cooling jackets 4 and 4 'are attached to a window frame 1 which is a cylindrical structural member. The water cooling jacket 4 has a layout for cooling the gas chamber 3, and the water cooling jacket 4 ′ has a layout for cooling the window frame 1 and the gas chamber 3.

As shown in FIG. 1 which is a longitudinal sectional view of an example of the monitoring window inside the apparatus of the present invention, the anti-fogging gas G supplied to the gas chamber 3 causes a swirling flow by a spiral blade 5. The gas is blown obliquely toward the glass surface of the window glass 2 from a gas outlet 6 provided adjacent to the window glass 2 to form a gas curtain covering the entire inner surface of the window glass 2.

FIG. 1 is a longitudinal sectional view of an example of a monitoring window inside the apparatus of the present invention, and FIG. 2 is a perspective view of FIG. As shown in FIG. 4, the fogging prevention gas G enters the gas chamber 3 from the two supply ports 11 and 11 ', and cuts the monitoring window at a position A shown in FIGS. As shown in FIG. 3 which is a cross-sectional view taken along the line, a swirling flow is given by a spiral blade 5 provided in contact with the inside of the gas chamber 3, and is ejected from a gas ejection port 6 as shown in FIG. After hitting the glass surface of the window glass 2 obliquely on the device side to form a gas curtain on the glass surface, the gas flows through the window frame 1 through the inside of the device.

FIG. 6, FIG. 7, and FIG. 8 are enlarged views of the vicinity of the gas outlet 6 in FIG. 1, which is a longitudinal sectional view of an example of the monitoring window inside the apparatus of the present invention.

When the spiral blade 5 is formed in a rectangular shape as shown in FIG. 6, the monitoring window inside the device of the present invention can be easily manufactured. In order to obtain an ideal swirling flow, as shown in FIG. 7, a spiral blade 5 may be provided so as to extend to the gas ejection port 6 so as to be in contact with the gas chamber, and as shown in FIG. The path of the gas G may be made to have a shape with low resistance, and the spiral blade 5 may be in contact with the path of the fogging prevention gas G.

As shown in FIGS. 6 and 7, the end portion 12 of the cylindrical member is preferably tapered diagonally so as to have no resistance when the fogging prevention gas G flows.

The water-cooling jacket 4 is provided in the gas chamber 3 at the position A of the monitoring window inside the apparatus shown in FIGS. 1 and 2, as shown in FIG. The fogging prevention gas G is cooled by the heat transfer through the inner wall 10 which is adjacent to the gas chamber 3 and the water cooling jacket 4 by flowing the cold water W adjacent thereto.

The water-cooled jacket 4 'is cooled at the position C of the monitoring window inside the apparatus shown in FIGS. 1 and 2, as shown in FIG. By flowing the water W, the cylindrical structural member 1 is cooled, and the temperature rise of the mounting portion of the window glass 2 is prevented.

The above-described monitoring window inside the device is an example of the monitoring window inside the device of the present invention. In the present invention, the monitoring window inside the device is a window frame 1 which is a cylindrical structural member. A gas chamber 3 provided on the window frame for temporarily storing a fogging prevention gas, a spiral blade 5 provided in the gas chamber 3, a window glass 2, and a gas chamber 3 adjacent to the window glass 2; It suffices if the gas chamber 3 is constituted by the gas jet port 6 for the fogging prevention gas G communicating therewith, and the layout and number of the gas chambers 3 are not limited.

Further, a water cooling jacket 4 is attached to the monitoring window inside the apparatus of the present invention to prevent the window glass 2 from cracking. However, the layout and number of the water cooling jackets 4 are not limited.

The method of mounting the monitoring window inside the apparatus of the present invention on the wall of the apparatus whose inside is to be monitored is performed, for example, as shown in FIG. 1 or FIG. A flange 9 may be provided on the opposite side, and may be attached to the wall of the device whose inside is monitored by bolts penetrating the flange 9 and the wall of the device whose inside is monitored. If the wall has sufficient thickness and strength to support the window frame itself when the body itself is inserted, the window frame 1 is not provided with the flange 9 and a hole is formed in the wall of the device. After penetrating the window frame itself, which is a structural member in the shape of a circle, the periphery may be sealed by welding or a filler.

The mounting method is not limited as long as the monitoring window inside the apparatus of the present invention is mounted on the wall of the apparatus whose inside is to be monitored with sufficient strength and the inside of the apparatus is shut off from the outside air at the mounting section.

In the present invention, the means for attaching the window glass 2 to the window frame 1 which is a cylindrical structural member may be such that the flange 7 is entirely screwed as shown in FIG.
Alternatively, a bolt hole may be provided, and the bolt may be attached with a nut. At this time, in order to seal as shown in FIG. 1, it is preferable to seal using a packing 8 made of resin or rubber, for example, silicone rubber.

The cooling water supplied to the water cooling jackets 4 and 4 'may be used without circulating only water, or may be circulated while being cooled by cooling means. Further, a cooling liquid obtained by mixing water and ethylene glycol, propylene glycol, or the like is used as the cooling water, and the cooling means is used at 0 °
The cooling effect may be enhanced by circulating while cooling below.

The window frame 1, which is a cylindrical structural member of the monitoring window inside the apparatus of the present invention, is preferably formed by processing a metal such as stainless steel for durability.

As the circular window glass used for the monitoring window inside the apparatus of the present invention, it is preferable to use heat-resistant glass in order to prevent cracks due to a temperature difference between the inner surface and the outer surface.

An embodiment of the monitoring window inside the apparatus of the present invention will be described below, but the present invention is not limited to the following embodiment.

[0039]

EXAMPLE A pipe made of stainless steel having an inner diameter of 150 mm was used for a window frame 1 as a cylindrical structural member.
A monitoring window inside the apparatus whose perspective view is shown in FIG. 2 was prepared.

As shown in FIG. 9, which is a schematic sectional view of the float device having the monitoring window attached to the side wall, the water cooling jacket 4 ′ for cooling the window frame 1 of the manufactured monitoring window to the window glass 2. The other end of the opposite side of the window glass 2 is protruded outward from the side wall 13 of the float glass manufacturing apparatus, and the other end of the window glass 2 is bolted to the side wall 12 by using the flange 9 and the side wall 13. Fifteen
A monitoring window was installed at a position and at an angle that could be monitored.

The float glass manufacturing apparatus was operated, and nitrogen was used as a gas G for preventing fogging of the window glass 2 of the monitoring window inside the manufactured apparatus. The gas was 0.7 m ³ / Hr, that is, 1 m ³ / Hr.
After supplying the gas at a flow rate of 1.7 L / min into the gas chamber 3 shown in the cross-sectional view of the monitoring window in FIG. Squirted.
Further, 5 L of cooling water kept at room temperature, that is, about 20 ° C., is supplied to the water cooling jacket 4 and the water cooling jacket 4 ′, respectively.
/ Min flow rate.

After operating the float glass manufacturing apparatus, the strip glass 14 in the float glass manufacturing apparatus is monitored through the internal monitoring window while the nitrogen gas G is jetted under the above conditions and the cooling water W is flowing. Meanwhile, one year has passed,
No fogging or cracking was observed on the window glass 2. Comparative Example FIG. 10 is a schematic view of a conventional device internal monitoring device viewed obliquely. Height, 2
A rectangular internal monitoring window having a width of 00 mm and a width of 150 mm was attached to the side wall of the float glass manufacturing apparatus, and nitrogen was applied as a fogging preventing gas to 1.5 m ³ / Hr, that is, 25 L / min.
While supplying, monitoring the strip glass in the float glass manufacturing apparatus through the conventional internal monitoring window, when one month has passed, the window glass begins to become cloudy due to the atmosphere inside the float glass manufacturing apparatus, and three months have passed. At the end of the day, the window had to be replaced.

[0043]

According to the present invention, there is provided a monitoring window provided in a wall of a device whose inside is monitored, for example, a metal vapor contained in an atmosphere inside a float glass manufacturing device.
The effect of preventing the window glass from fogging due to the adhesion of fine particles and fine particles, etc., and suppressing the cracks due to the temperature difference between the front and back of the window glass is dramatically improved compared to the conventional window for internal monitoring of float glass manufacturing equipment. Things.

Further, the amount of the gas for preventing fogging of the monitoring window inside the apparatus of the present invention can be significantly reduced as compared with the internal monitoring window of the conventional apparatus.

Further, by attaching a water-cooling jacket to the monitoring window inside the apparatus of the present invention, the temperature of the fogging prevention gas hitting the window frame of the internal monitoring window and the window glass is reduced, and the inner and outer surfaces of the window glass are reduced. Can be prevented from being caused by a temperature difference from the above.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an example of a monitoring window inside an apparatus of the present invention.

FIG. 2 is an oblique perspective view of an example of a monitoring window inside the apparatus of the present invention.

FIG. 3 shows a monitoring window A inside the apparatus shown in FIGS. 1 and 2;
FIG. 5 is a cross-sectional view of the monitoring window cut in a circle at the position of FIG.

FIG. 4 shows a monitoring window B inside the apparatus shown in FIGS. 1 and 2;
FIG. 5 is a cross-sectional view of the monitoring window cut in a circle at the position of FIG.

FIG. 5 shows a monitoring window C in the apparatus shown in FIGS. 1 and 2;
FIG. 5 is a cross-sectional view of the monitoring window cut in a circle at the position of FIG.

FIG. 6 is an enlarged view of the vicinity of a gas outlet in FIG. 1, which is a longitudinal sectional view of an example of a monitoring window inside the apparatus of the present invention.

7 is an enlarged view of the vicinity of a gas ejection port in FIG. 1, which is a longitudinal sectional view of an example of a monitoring window inside the apparatus of the present invention.

8 is a longitudinal sectional view of an example of a monitoring window inside the apparatus of the present invention, and is an enlarged view of the vicinity of a gas outlet of FIG.

FIG. 9 is a schematic sectional view of a float glass manufacturing apparatus to which an example of a monitoring window inside the apparatus of the present invention is attached.

FIG. 10 is a schematic view of a conventional monitoring window inside the device (device internal monitoring device) viewed obliquely.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Window frame 2 Window glass 3 Gas chamber 4, 4 'water-cooling jacket 5 Spiral blade 6 Gas ejection port 7 Flange 8 Packing 9 Flange

Claims (2)

[Claims] Claims: 1. An apparatus for monitoring the inside of an apparatus, comprising:
A monitoring window inside the device, wherein a gas outlet for preventing contamination of the window glass due to the atmosphere in the device is provided,
It consists of a window frame made of a cylindrical structural member and a circular window glass attached to the tip of the window frame, and a gas outlet for preventing contamination of the window glass is provided adjacent to the window glass. A window for monitoring inside the apparatus, wherein the window is provided with a gas chamber attached to the window frame, and spiral blades for giving a swirling flow to the gas to be jetted are provided in the gas chamber. 2. The monitoring window inside the device according to claim 1, further comprising a water cooling jacket attached to the window frame.