KR20140001886A - Clarification tank, glass melting furnace, molten glass production method, glassware production method and glassware production device - Google Patents

Abstract

An object of this invention is to provide the clarification tank provided with the 1st clarification tank, the 2nd clarification tank, and a cooling tank.
This invention is the flow path of the 1st molten glass divided by the 1st bottom wall part and the 1st side wall part of the both sides, the drain out part formed in the bottom wall part of the downstream side of the flow path of this 1st molten glass, and a molten glass A first clarification tank having a heating means of the first molten glass, the length of the flow path of the first molten glass being greater than the height of the first side wall portion, and the first clarification tank; The 2nd clarification tank which has the flow path of the 2nd molten glass divided by 2 side wall parts, and has a flow path shape in which a molten glass becomes a uniflow state, and is provided following the said 2nd clarification tank, and the 3rd bottom wall part and It is related with the clarification tank provided with the cooling tank provided with the flow path of the 3rd molten glass divided by the 3rd side wall part of the both sides.

Description

Clarification tank, glass melting furnace, manufacturing method of molten glass, manufacturing method of glassware and manufacturing apparatus of glassware {CLARIFICATION TANK, GLASS MELTING FURNACE, MOLTEN GLASS PRODUCTION METHOD, GLASSWARE PRODUCTION METHOD AND GLASSWARE PRODUCTION DEVICE}

This invention is the clarification tank provided with the 1st clarification tank, 2nd clarification tank, and cooling tank for manufacturing molten glass, the glass melting furnace provided with it, the manufacturing apparatus of a glass product, and the manufacturing method of the molten glass using the clarification tank. And a method for producing a glass article.

As an example of the method of manufacturing a glass plate, using the glass manufacturing apparatus provided with a melting tank, a clarification tank, and a shaping | molding apparatus, a glass raw material is melted in a melting tank, the obtained molten glass is bubbled out of a clarification tank, and uniformity with few bubbles is carried out. The float method which transfers the melted glass which was made to the shaping | molding apparatus provided with a float bath to make a glass plate is known.

In the clarification tank used for this float method, the flow path of a molten glass is formed, and this flow path is generally comprised by attaching two or more refractory materials, such as a fire brick.

Moreover, when melting a glass raw material in a melting tank, the gas which inevitably forms bubbles in a molten glass at the time of reaction of a raw material component will generate | occur | produce, and degassing of a molten glass in a clarification tank, and high quality molten glass with few bubbles. It is necessary to obtain this and transfer this molten glass to the shaping | molding apparatus of a next process.

The general clarification of the molten glass is by chemical clarification, for which a clarifier is added in advance in the glass raw material and introduced into the molten glass. The clarifier is a polyvalent oxide which is reduced at high temperatures (ie, the clarifier loses oxygen), and is oxidized (bonded with oxygen) at low temperatures. When the oxygen released by the clarifier increases bubbles in the molten glass, and the grown bubbles float on the molten glass liquid surface, the bubbles are broken and degassed.

In such a background, as a glass melting apparatus, a melting tank for melting batch raw materials to form a molten glass, a clarification tank having a shallow molten glass flow path connected to the melting tank, and a homogenization tank connected to the clarification tank The glass melting apparatus of the provided structure is known (refer patent document 1 and patent document 2).

Japanese Patent Laid-Open No. 61-132565 U.S. Patent Publication 6085551

In the glass melting furnace provided with the conventional melting tank and the clarification tank, the glass melt | dissolved in the melting tank enters a clarification tank, and one part returns to a melting tank by convection. While circulating this melting tank and a clarification tank, clarification of a glass advances and a molten glass is clarified. Here the clarified glass flows to the downstream forming process.

In this type of clarification tank, a clarification tank called a high temperature clarification type is known. In this high temperature clarification tank, in order to perform bubble removal efficiently, it sets as high as possible on the conditions which do not re-foam the temperature of the molten glass which flows through a clarification tank, and reduces the viscosity of a molten glass, and the bubble growth rate By increasing the bubble diameter to increase the bubble diameter, the floating speed of the bubble is increased so that the bubble can be removed.

However, in the glass currently desired, higher quality glass is calculated | required and the structure of the clarification tank which can perform the bubble removal of molten glass more effectively in the glass melting furnace provided with a melting tank and a clarification tank is desired.

Moreover, when producing molten glass using the high temperature clarification tank, since the temperature of the molten glass which flows through a clarification tank is set as high temperature as possible, naturally, it consumes a lot of energy. In these days, the demand for energy saving has been demanded for a clarification tank which satisfies the bubble removing performance and enables energy saving operation.

In addition, in order to perform high temperature clarification, most of the glass flow path is normally comprised by the refractory metal which consists of a rare metal which has fire resistance, such as platinum or a platinum alloy. For this reason, even if the clarification tank which performs high temperature clarification is large, it is thought that it is about 20-50 tons per day production. At least, no single clarification bath for hot clarification in excess of 100 tons per day is present to the knowledge of the inventors. Therefore, a technique that can take advantage of high temperature clarification and which can realize a low cost or large scale glass melting furnace is desired.

In the apparatus which manufactures the molten glass of the high melting point of patent document 2, what is called a "refining bank" is formed in the area | region which clarifies a glass raw material after melting. Moreover, in the "refining bank", the molten glass is heated by the burner which is in the upper part. For this reason, it is difficult to manufacture a large capacity molten glass, and it is thought that energy saving property is not high.

An object of the present invention is to provide a clarification tank that can be bubbled efficiently and can be constructed at low cost or on a large scale, which can efficiently bubble out to realize the above-mentioned demand.

Moreover, an object of this invention is to provide the manufacturing method and manufacturing apparatus of a molten glass which can be provided with the said clarification tank, and can provide a high quality molten glass and a glass product, and a manufacturing method of a glass product.

MEANS TO SOLVE THE PROBLEM As a result of earnest research, in order to achieve the said objective, even if it uses mainly a refractory brick, it is possible to coat the structure of the clarification tank characterized by the high temperature clarification which can produce and maintain the quality of the following molten glass. )did. As a result, a low cost or a large clarification tank can be realized.

This invention is the flow path of the 1st molten glass divided by the 1st bottom wall part and the 1st side wall part of the both sides, the drain out part formed in the bottom wall part of the downstream side of the flow path of this 1st molten glass, and a molten glass A first clarification tank having a heating means of the first molten glass, the length of the flow path of the first molten glass being greater than the height of the first side wall portion, and the first clarification tank; The 2nd clarification tank which has the flow path of the 2nd molten glass divided by 2 side wall parts, and has a flow path shape in which a molten glass becomes a uniflow state, and is provided following the said 2nd clarification tank, and the 3rd bottom wall part and The clarification tank provided with the cooling tank provided with the flow path of the 3rd molten glass divided by the 3rd side wall part of the both sides is provided.

In the clarification tank of this invention, in the flow path of the said 2nd molten glass, the width orthogonal to the flow path direction of a 2nd bottom wall part may be made larger than the height of a 2nd side wall part.

In the clarification tank which concerns on this invention, when the shape of the flow path of the said 2nd molten glass is Grgrass number of the molten glass which flows through the flow path, Gr and Reynolds number are Re, Gr / It is preferable to set such that Re2 < 11420 is satisfied.

In the clarification tank which concerns on this invention, the heating means of a said 1st clarification tank is a some electrode, and in the said 2nd clarification tank, the 2nd molten glass flow path in a said 2nd bottom wall part and a 2nd both side wall part is It is preferable that the inner surface cover of the heat resistant metal which is made of a fire brick and covers the fire brick of the flow path side is provided.

In the clarification tank which concerns on this invention, the heating means of a said 1st clarification tank is a burner, and in the said 1st and 2nd clarification tank, the molten glass flow path in the said bottom wall part and both side wall parts is a refractory brick material, It is preferable that the inner surface cover of the heat resistant metal which covers the fire brick of the flow path side is provided.

In the clarification tank which concerns on this invention, the flow volume through which the length of the flow path of the said 1st molten glass is 10-15 m, the length of the flow path of the said 2nd molten glass is 4-14 m, and the flow path of a molten glass is 100-1000 You can do it in tons / day.

In the clarification tank of this invention, the 1st edge part higher than the 1st bottom wall part may be formed in the most upstream end of the flow path of a said 1st molten glass.

In the clarification tank of this invention, the 2nd end part higher than the 2nd bottom wall part may be formed in the most upstream end of the flow path of the said 2nd molten glass.

In the clarification tank of this invention, a 1st convex part may be formed in the corner part of a 2nd side wall part and a 2nd bottom wall part in the downstream of the flow path of a said 2nd molten glass.

In the clarification tank of this invention, a 2nd convex part may be formed by the corner part of a 2nd side wall part and a 2nd bottom wall part further upstream from the formation position of a said 1st convex part in the flow path of the said 2nd molten glass.

In the clarification tank of this invention, the said inner surface cover consists of several cover assembly which covers the molten glass flow path side of the said bottom wall part and the side wall part, and is arrange | positioned along the flow direction of the said molten glass, The said cover assembly is the said bottom wall The bottom wall plate which covers a part, the side wall plate which covers the said side wall part, and the 1st cover plate which covers the abutting area | region of the cover assemblies arrange | positioned along the said flow path may be provided.

In the clarification tank of this invention, the inner surface cover of the heat resistant metal which covers the molten glass flow path side in the said 3rd bottom wall part and both 3rd side wall part may be provided in the said cooling tank.

In the clarification tank of the present invention, the heating means provided in the first clarification tank is composed of a plurality of electrodes erected in the first clarification tank, and predetermined intervals are formed such that these electrodes form a matrix along the flow direction of the molten glass. The plurality of electrodes arranged vertically and horizontally and arranged in a line along the flow path direction of the molten glass may be a multiphase AC electrode.

This invention has the clarification tank as described in any one of the above, and provides the glass melting furnace provided with the melting tank in the upstream of the flow direction of the molten glass of the said clarification tank.

This invention uses the glass melting furnace described above, and melt | dissolves a glass raw material with a melting tank, heats and clarifies the molten glass which came out of the said melting tank in a 1st clarification tank, and is downstream of the 1st clarification tank. A step of discharging the foreign matter generated in the first clarification tank from the bottom of the tank, clarifying the flow of the molten glass of the second clarification tank in a uniflow state, and deriving from the second clarification tank by the cooling tank. It provides the manufacturing method of a molten glass including the process of cooling a molten glass.

Method of producing molten glass of the present invention, is the uni-flow state, assuming that the Grashof number Gr of the molten glass, the Reynolds number Re, Gr / Re ² You may set the flow velocity of a molten glass, the temperature change of the molten glass in the inlet and outlet of the flow path of a molten glass, and the depth of a molten glass so that <11420 may be satisfied.

The manufacturing method of the molten glass of this invention does not need to heat the molten glass of the said 2nd clarification tank. This means that it is not necessary to provide a heating means as a preferred range of the second clarification tank of the present invention.

The manufacturing method of the molten glass of this invention is implemented so that the heating in a said 1st clarification tank may raise the temperature of the downstream end side of a said 1st clarification tank with respect to the temperature of the molten glass which flows through a said 1st clarification tank. desirable.

MEANS TO SOLVE THE PROBLEM This invention is a manufacturing method of the glass goods containing the process of manufacturing the molten glass previously described, the process of shape | molding a molten glass after cooling a molten glass to the glass forming temperature area | region, and the process of cooling the glass after shaping | molding. To provide.

This invention provides the manufacturing apparatus of the glass goods provided with the glass melting furnace described above, the shaping | molding means which shape | molds the molten glass manufactured by this glass melting furnace, and the slow cooling means which cools the glass after shaping | molding.

This invention is the flow path of the 1st molten glass divided by the 1st bottom wall part and the 1st side wall part of the both sides, the drain out part formed in the bottom wall part of the downstream side of the flow path of this 1st molten glass, and a molten glass A first clarification tank having a heating means of the first molten glass, the length of the flow path of the first molten glass being greater than the height of the first side wall portion, and the first clarification tank; The 2nd clarification tank which has the flow path of the 2nd molten glass divided by 2 side wall parts, and has a flow path shape in which a molten glass becomes a uniflow state, and is provided following the said 2nd clarification tank, and the 3rd bottom wall part and By the clarification tank provided with the cooling tank provided with the flow path of the 3rd molten glass divided by the 3rd side wall part of the both sides, the bubble remaining in a 1st clarification tank can be taken out from a 2nd clarification tank, 1 Fire resistant by high temperature clarification in clarification tank Effluent foreign matter eluted from the refractory bricks, which are easily generated when a flow passage is used, and enters into the molten glass can be effectively discharged from the bottom of the downstream side of the first clarification tank to further remove bubbles and maintain the quality of the molten glass. Can be. Moreover, since it becomes possible to enlarge a clarification tank on a large scale, and to carry-in calorie | heat amount from a molten glass, this invention may not provide a heating means in a 2nd clarification tank. Moreover, in the 2nd clarification tank, since clarification process can be performed without heating, energy saving operation is possible, and energy saving operation can be performed rather than the structure provided with the heating means to a 2nd clarification tank.

In the 2nd clarification tank, since the molten glass which flows through a flow path can flow in the uniflow state of the one direction from an upstream side to a downstream side, bubble removal can be further performed on conditions favorable for bubble removal. Specifically, since it can flow in a uni-flow state, since there is no circulation flow, it can prevent the molten glass with low temperature returning to the upstream side of high temperature degree, and can eliminate the heat loss by reheating a 1st clarification tank. have.

According to the heating means of a 1st clarification tank, only the molten glass flow path of a 2nd clarification tank or the molten glass flow path of a 1st and 2nd clarification tank is made into a refractory brick, and the fire brick is covered with a heat resistant metal, and 1st Since most of the molten glass flow path of the clarification tank and the second clarification tank does not need to mainly comprise platinum or a platinum alloy, the low cost or large scale glass melting furnace can be realized.

Even when the structure which provided the inner surface cover of the heat-resistant metal to the 2nd clarification tank is employ | adopted, even if the 1st clarification tank introduces the molten glass which made it as high temperature as possible into a 2nd clarification tank, and aims at a high clarification effect, The influence on the furnace material which comprises a 2nd clarification tank is reduced, and the problem, such as damage of an old material and elution of a foreign component, can be avoided in a 2nd clarification tank.

By using the first clarification tank and the second clarification tank according to the present invention, in the first clarification tank, the convection heating is performed as high as possible by the heating means to remove bubbles and discharge of foreign matter leaking from the firebrick. By carrying out and clarifying a molten glass by the two-step process of clarifying by the flow of a fixed direction in a 2nd clarification tank, efficient bubble removal can be implement | achieved by energy saving operation. For this reason, the high quality molten glass and glass goods with few bubbles which do not contain the impurity can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows an example of the manufacturing apparatus of the glassware provided with the clarification tank which concerns on 1st Embodiment of this invention.
2 is a schematic plan view showing a main part of the manufacturing apparatus;
Fig. 3 shows a cross-sectional structure of the second clarification tank shown in Fig. 1, in which Fig. 3 (a) is a cross sectional view and Fig. 3 (b) is a partially enlarged sectional view of the clarification tank.
4 is a configuration diagram showing an example of an inner surface cover disposed in the clarification tank.
5 is a plan view illustrating an example of an inner surface cover disposed in the clarification tank.
6 is a partial cross-sectional view showing an example of an inner surface cover disposed inside the clarification tank.
7 is an exploded perspective view showing an example of an inner surface cover disposed inside the clarification tank.
8 is a flow chart showing an example of a process for producing a glass article according to the present invention.
It is a block diagram which shows an example of the manufacturing apparatus of the glassware provided with the clarification tank which concerns on 2nd Embodiment of this invention.
FIG. 10: is a schematic plan view which shows the principal part of the manufacturing apparatus of the glassware shown in FIG.
FIG. 11: shows the example of the convex part formed in the bottom wall part of a 2nd clarification tank in the manufacturing apparatus of the glassware shown in FIG. 9, FIG. 11 (A) is a perspective view which shows the 1st example of a 1st convex part, FIG. 11 (B) is a perspective view showing a second example of the first convex portion, FIG. 11 (C) is a perspective view showing a third example of the first convex portion, and FIG. 11 (D) is a perspective view showing a fourth example of the first convex portion, Fig. 11E is a perspective view showing a fifth example of the first convex portion, and Fig. 11F is a perspective view showing an example of the first convex portion and the second convex portion.
12 is a partial cross-sectional view showing a second example of an inner surface cover disposed inside a clarification tank.
13 is a front view showing a third example of the inner surface cover disposed in the clarification tank;
14 is a perspective view illustrating a fourth example of an inner surface cover disposed in the clarification tank;
It is a block diagram which shows an example of the manufacturing apparatus of the glassware provided with the clarification tank which concerns on 3rd Embodiment of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, although the clarification tank which concerns on this invention, the manufacturing method of the glass melting furnace and molten glass provided with it, and the manufacturing method and manufacturing apparatus of a glass product are demonstrated based on drawing, this invention implements the following It is not limited to form. In addition, in each drawing shown below, the scale of each component is simplified and shown easily in the case of illustration.

FIG. 1: is a block diagram which shows typically one Embodiment of the manufacturing apparatus of the molten glass provided with the clarification tank which concerns on this invention. FIG. 2: is a principal part top view of the same apparatus.

The manufacturing apparatus 1 of the glassware of this embodiment has the melting tank 2 for melt | dissolving a glass raw material, and producing molten glass, and the 1st clarification tank 3 provided in the downstream of this melting tank 2 one by one. ), A second clarification tank 4, a cooling tank 5, and a molding apparatus 6. In this embodiment, the clarification tank 7 of molten glass is comprised by the 1st clarification tank 3, the 2nd clarification tank 4, and the cooling tank 5, and also the melting tank 2 and blue The glass melting furnace 14 is comprised by the sign 7.

In the melting tank 2 of this embodiment, the input part (not shown) of glass raw material is formed in the one side, the connection part with respect to the 1st clarification tank 3 is formed in the opposite side, and the glass injected from the input part A raw material is melt | dissolved using heating apparatuses, such as a burner, and is installed as a tank for manufacturing molten glass. Moreover, the burner provided in the melting tank 2 is a burner of the type which blows a combustion salt mounted in the transverse direction to the side wall of the melting tank 2, or is attached downward to the ceiling wall of the melting tank 2; And a burner of a type of blowing combustion flames, and for granulation methods for in-air melting, in which a mixed powder raw material obtained by mixing the glass raw material powder at a predetermined ratio is blown directly from the burner to form molten glass in a hot gaseous atmosphere. Burner may be used. In addition, the melting tank 2 may be an apparatus which conducts electric heating using an electrode.

The 1st clarification tank 3 to which the melting tank 2 of this embodiment was connected is narrow in planar view, substantially constant in width, and as shown to FIG. 1, FIG. 2 of the 1st clarification tank 3, The length of a flow path direction, ie, the length of the flow path of a 1st molten glass, is comprised larger than the height of the side wall part of a melting tank, and the 1st bottom wall part 3a, the 1st side wall part 3b of both sides, and the ceiling part 3c Consists of That is, the first clarification tank of the present invention is different from the so-called rising type clarification tank in which the bottom of the clarification is a deeply deep tank structure. The area | region partitioned by the 1st bottom wall part 3a of the 1st clarification tank 3 and the 1st side wall part 3b of both sides is the flow path R1 of molten glass, and the dashed-dotted line GH of FIG. The molten glass is supplied to the 1st clarification tank 3 so that it may become the liquid surface position of this molten glass. A plurality of electrodes 8 are provided on the first bottom wall portion 3a of the first clarification tank 3 at predetermined intervals, and the molten glass is controlled by controlling the amount of current supplied to these electrodes 8, 8. It can be heated to the temperature aimed at.

In the first clarification tank 3, a plurality of refractory bricks (refractory materials) are joined through wood parts to form a bottom wall portion 3a, a side wall portion 3b, and a ceiling portion 3c. 1, it is comprised so that it may become an open shape as a tank of the shape shown in FIG. In FIG. 1 and FIG. 2, the thickness of the fire brick which comprises the 1st clarification tank 3 is abbreviate | omitted, and only the outline of a tank is shown. Thus, the cost related to the structure of a molten glass flow path can be reduced by using a molten glass flow path mainly as a refractory brick.

In the 1st clarification tank 3, the inlet side edge part (that is, the 1st end part) 3d raised one step from the bottom wall part 3a is formed in the upstream end side, ie, the part of the melting tank 2 side, In the first clarification tank 3, the downstream end side, that is, the second clarification tank 4 side, is lowered by one stage from the bottom wall portion 3a, and the drain out portion 3e for drain discharge is the width of the first clarification tank 3. It is formed in multiple directions. Since the 1st clarification tank 3 becomes high temperature, when it is made into a refractory brick, the component of the refractory brick may elute to a molten glass, and may become foreign material of a molten glass, but by forming this drain out part 3e By dissipating such foreign matter, it is possible to use a refractory brick.

The introduction port (that is, the inlet portion) 3f of the first clarification tank 3 is formed shallower than the other parts of the first clarification tank 3 as much as the inlet side end portion 3d is formed. Moreover, the downstream end side of the 1st clarification tank 3 is partitioned by the partition wall 3g which stands up perpendicularly, and the depth of the flow path R of a molten glass became shallow in the upper end side of this partition wall 3g. The 2nd clarification tank 4 is connected through the outlet 3h which is a part.

The second clarification tank 4 is narrow in plan view, substantially constant in width, and is configured as a tank that is shallower than the width as shown in FIGS. 1 and 2, and the second bottom wall portion 4a and its It consists of the 2nd side wall part 4b and the ceiling part 4c of both sides. The area partitioned by the 2nd bottom wall part 4a of the 2nd clarification tank 4, and the 2nd side wall part 4b of both sides becomes the flow path R2 of molten glass, and the dashed-dotted line GH of FIG. The molten glass G is supplied to the 2nd clarification tank 4 so that it may become the liquid surface position of this molten glass. In the flow path of this 2nd clarification tank 3, ie, the flow path of a 1st molten glass, the width orthogonal to the flow path direction of a 2nd bottom wall part is comprised larger than the height of the side wall part of a melting tank.

In addition, although the width | variety of a 2nd clarification tank is made constant in FIG. 2, the clarification effect may be improved by making the width of a 2nd clarification tank wider than the width of a 1st clarification tank, and making depth shallow.

In the second clarification tank 4, a plurality of refractory bricks are joined through a wood section to form a bottom wall portion 4a, a side wall portion 4b, and a ceiling portion 4c, and as a whole, FIGS. 1, 2 and 3. It is comprised so that it may become an open shape as a tank as shown to. In FIG. 1 and FIG. 2, the thickness of the refractory brick (refractory material) which comprises the 2nd clarification tank 4 is abbreviate | omitted, and only the outline of a tank is shown, and the bottom wall part 4a and the side wall part 4b are shown as an example in FIG. ) And draw the thickness of the fire bricks that make up them.

In addition, the size of the fire brick which comprises the bottom wall part 4a and the side wall part 4b is arbitrary, The number and size of the fire bricks applied according to the size of the bottom wall part 4a and the side wall part 4b are selected freely. can do. For example, the bottom wall part 4a and the side wall part 4b shown to FIG. 3 (a) may be made into a multilayer structure by the some fire brick. In the structure shown in FIG. 3, for the sake of simplicity, only one refractory brick 4d constituting the bottom wall portion 4a is shown, and the refractory brick constituting the side wall portion 4b in the height direction of the side wall portion 4b. Two laminated examples are shown. In FIG. 3, the 1st fire brick 4e is arrange | positioned at the bottom side of the side wall part 4b, for example, and is shown as the structure which piled up the 2nd fire brick 4f on it. 3, the water cooling jacket 50 is provided in the outer side (namely, the back side) of the fire brick 4f which comprises the upper end part of the side wall part 4b. Since the structure of the water cooling jacket 50 is a well-known structure, detailed description is abbreviate | omitted and the detailed structure is abbreviate | omitted also in FIG. In addition, as an example, the water cooling jacket 50 can employ | adopt the structure which comprises a circulation flow path by a crown and a return pipe, and flows cooling water into the circulation path, and cools it.

In the 2nd clarification tank 4, the inlet side edge part (that is, 2nd end part) 4g raised from the bottom wall part 4a by 1 step is formed in the upstream end side, ie, the part of the 1st clarification tank 3 side, , The introduction port (that is, the inlet portion) 4h of the second clarification tank 4 is formed shallower than other portions of the second clarification tank 4, and the bottom wall portion on the downstream end side in the second clarification tank 4 is provided. 4b is connected to the cooling tank 5 via the discharge port (namely, outlet part) 4i with fixed depth.

The cooling tank 5 is narrow in plan view, substantially constant in width, and is constituted as a deeper tank than the second clarification tank 4 as shown in FIG. 1, and the third bottom wall portion 5a and the first and second sides are formed. It consists of three side wall parts 5b and the ceiling part 5c. The area | region partitioned by the 3rd bottom wall part 5a of the cooling tank 5 and the 3rd side wall part 5b of both sides is the flow path R3 of molten glass, and the dashed-dotted line GH of FIG. 1 melt | dissolves The molten glass G is supplied to the cooling tank 5 so that it may become the liquid surface position of glass.

The upstream end side of the cooling tank 5 is an inlet (inlet) 5e of the molten glass, connected to the outlet 4i of the second clarification tank 4, and is connected to the downstream end side of the cooling tank 5. The discharge side end part 5d is formed, the shaping | molding apparatus 6 is connected to the downstream side, and the outlet port (outlet part) 5f of the downstream end part of the flow path R3 formed shallowly by the discharge side end part 5d. The molten glass G is supplied to the shaping | molding apparatus 6 from the. In addition, the code | symbol 9 shown in FIG. 1 represents the stirring apparatus provided in the inside of the cooling tank 5. As shown in FIG.

In the cooling tank 5, a plurality of refractory bricks (refractory materials) are joined through wood parts to form the bottom wall portion 5a, the side wall portion 5b, and the ceiling portion 5c, as shown in Figs. 1 and 2 as a whole. It is comprised so that it may become an open shape as a tank as follows. In FIG. 1 and FIG. 2, the thickness of the fire brick which comprises the cooling tank 5 is abbreviate | omitted, and only the outline of a tank is shown.

In the clarification tank 7 of this embodiment, the inner surface cover is provided in the 2nd clarification tank 4 and the cooling tank 5. The inner surface cover 15 provided in the second clarification tank 4 almost surrounds the flow path R2 partitioned by the bottom wall part 4a and the side wall parts 4b and 4b of the second clarification tank 4. It is formed in the height and width which can be stowed, and is installed over the almost full length of the 2nd clarification tank 4. Moreover, the inner surface cover 15 provided in the cooling tank 5 can almost surround the flow path R3 partitioned by the bottom wall part 5a of the cooling tank 5, and the side wall parts 5b and 5b. It is formed in the height and width which exist, and is provided over the almost full length of the cooling tank 5. By providing an inner surface cover in the refractory brick on the molten glass flow path side of the 2nd clarification tank 4 and the cooling tank 5, it is the 2nd clarification tank and cooling by the molten glass which moved relatively from the 1st clarification tank. It is possible to prevent the foreign material from flowing out of the firebrick of the tank.

The inner surface cover 15 of this embodiment is comprised by extending the plurality of cover assemblies 16 shown in FIG. 4 or more later in the longitudinal direction of the flow path R2, R3, and the 2nd clarification tank 4 And the cooling tank 5 are applied. In addition, since the inner surface cover 15 applied to the cooling tank 5 in this embodiment is the same structure as the inner surface cover 15 applied to the 2nd clarification tank 4, description of the inner surface cover 15 mentioned later The inner surface cover 15 provided with respect to the 2nd clarification tank 4 is explained in full detail, and description is abbreviate | omitted about the inner surface cover 15 provided with the cooling tank 5.

In the case of the float glass plate manufacturing method, the shaping | molding apparatus 6 is a bed layer 10 of molten tin in the pool part partitioned by the bottom wall 6a and the circumferential wall 6b (namely, molten tin in a float glass manufacturing apparatus). This accommodated float bath) is formed, the molten glass G flows in and spreads on this bed layer 10, and plate-shaped glass can be shape | molded. In addition, as a shaping | molding apparatus, it is not limited to the float method, The shaping | molding of plate-shaped glass by the roll out method, the down-draw method, etc., the shaping | molding method of other plate-shaped glass, blow molding methods, such as a glass bottle, etc. may be sufficient.

In the manufacturing apparatus 1 of this embodiment, as shown in FIG. 3 to the 2nd clarification tank 4, the inner surface cover 15 for protecting the inner surface of the bottom wall part 4a and the side wall parts 4b and 4c is provided. It is installed. This inner surface cover 15 is made into the structure shown in FIGS. 4-7 in detail. In order to cope with the thermal expansion difference with the furnace material at the time of a heat rise, the inner surface cover 15 divides a plate and forms the clearance gap. Moreover, when molten glass flows, in order to prevent the heterogeneous molten glass which originates from a furnace material from flowing from this clearance gap, the structure which covers the part of a clearance gap is formed as follows.

The inner surface cover 15 of the present embodiment has a height and a width that can almost surround the flow path R2 partitioned by the bottom wall portion 4a and the side wall portions 4b and 4b of the second clarification tank 4. It is formed and is provided over almost the entire length of the 2nd clarification tank 4.

The state which comprised the inner side cover 15 by extending the cover assembly 16 in multiple numbers is shown in FIG. 4, the planar structure of the state is shown in FIG. 5, the front structure of the state is shown in FIG. The state which partially disassembled (16) is shown in FIG.

The cover assembly 16 of the present embodiment includes the first plate assembly 17 and the first plate assembly disposed adjacently in the width direction of the second clarification tank 4 (that is, the direction orthogonal to the flow direction of the flow path R2). It is comprised mainly by the 2 plate assembly 18, the 1st cover plate 22 arrange | positioned around them, and the 2nd cover plate 23 mainly.

The first plate assembly 17 and the second plate assembly 18, the first cover plate 22 and the second cover plate 23 are all made of Mo (molybdenum), Mo alloy, W (tungsten), It consists of plate materials made of heat-resistant metals, such as W alloy or Pt, PtRh alloy, and other Pt alloy. In particular, by using relatively inexpensive ones such as Mo and W as heat-resistant metals, a lower cost or a larger-scale glass melting furnace can be realized. The glass melting furnace of the present embodiment can realize a glass melting furnace of 50 tons or more, more preferably 100 tons or more, and more preferably 500 tons or more, which is not conventionally produced, by using inexpensive heat-resistant metals other than Pt or Pt alloy. have. In the present invention, glass melting furnaces up to at least 1000 tons can be realized. In the case of 100 tons or more of daily production, since the amount of heat which molten glass carries in is large, it is not necessary to use a heating means for a 2nd clarification tank. 4-15 m are preferable and, as for the length of the flow path of the 1st molten glass, (ie the length of the flow path of the molten glass of the 1st clarification tank 3) with respect to this daily output, 10-15 m is more preferable. Moreover, 2-15 m are preferable and, as for the length of the flow path of the 2nd molten glass (that is, the length of the flow path of the molten glass of the 2nd clarification tank 4), 4-14 m are more preferable. Moreover, 4-20 m are preferable and, as for the length of a cooling tank, 10-20 m are more preferable.

In the clarification tank of the present invention, by discharging foreign matters generated in the first clarification tank and using an inner surface cover made of a heat-resistant metal, it is not necessary to use an expensive heat-resistant metal, as described above. Different large scale high temperature clarification type molten glass furnaces are possible.

The first plate assembly 17 is half the width of the bottom wall portion 4a of the second clarification tank 4 (that is, half the width direction of the bottom wall portion 4a orthogonal to the flow direction of the flow path R). The first bottom wall plate 20 which has a width | variety and which is narrow in the flow direction of the flow path R2, and the 1st side wall plate 21 which were installed along the long side of one side of the said width direction mainly consists of Consists of.

The second plate assembly 18 has a width that can cover about half the width of the bottom wall portion 4a of the second clarification tank 4, and has a rectangular shape of the second bottom wall plate that is narrow in the flow direction of the flow path R2 ( 25 and a second side wall plate 26 which is provided along the long side of one side in the width direction of the bottom wall plate 25 as a main body. Moreover, when the clarification tank is wide, you may use an additional flat bottom wall plate. Also in this case, the plate which covers this clearance gap is provided in the clearance gap between bottom wall plates.

Further, the first cover plate 22 is provided so as to cover the abutting areas of the first plate assemblies 17 and 17 arranged along the flow path R2 and the abutting areas of the second plate assemblies 18 and 18. It is installed. The first cover plate 22 includes an L-shaped third cover plate 22A covering the end of the first bottom wall plate 20 and the end of the first side wall plate 21, and the second bottom wall plate 25. It consists of the L-shaped 3rd cover plate 22B which covers the edge part of and the edge part of the 2nd side wall plate 26, and the 4th cover plate 24 which covers the edge part of the said 3rd cover plate 22A.

A rod-shaped joint member 28 is attached to a portion where the first side wall plate 21 stands up on the long side of the upper surface of the first bottom wall plate 20, and the bottom wall plate 20 and the side wall plate 21 are attached. Is screwed through the joint portion 28 where the tab is opened. The material of this joint member 28 and a screw can illustrate Mo. Moreover, the joint member 28 is formed slightly shorter than the full length of the long side of the 1st bottom wall plate 20, and the joint member 28 is located in the 1st bottom wall plate 20 at the both ends outer side of the joint member 28. As shown in FIG. The corner part 29 which is not extended is formed. If the joint member 28 is a structure which can cover the space | interval between plates, what formed the level | step difference by bending process or cutting process may be sufficient.

The first side wall plate 21 and the second side wall plate 26 are both formed at the same height. These side wall plates 21 and 26 are formed so that the upper end may become a position lower than the liquid surface position GH of the molten glass which flows through the flow path R2. In other words, when the molten glass G flows along the flow path R2, the 1st side wall plate 21 and the 2nd side wall plate 26 are both the height which is covered by the molten glass G in the whole. Formed. This is to prevent this in consideration of the risk of burning if Mo is formed in contact with air at 500 to 600 ° C. when these plates 21 and 26 are formed of Mo, for example.

Moreover, on the end side of the 1st side wall plate 21 located downstream along the said flow path R2, and the end side of the 2nd side wall plate 26 located downstream along the said flow path R2, The teeth 21a and 26a which protrude toward the outer side of the flow path R2 are formed at right angles with each plate 21 and 26, respectively.

The said 3rd cover plate 22A consists of the bottom plate 22a and the side plate 22b formed by folding | folding and forming one board | plate material, and is formed in L shape. The 3rd cover plate 22A of the 1st side wall plate 21 is formed in the corner part 29 formed in the edge part side of the said joint member 28 along the boundary part of the bottom plate 22a and the side plate 22b. It is attached by fasteners 30, such as a rivet, along an edge part. In addition, the number and size of rivets can be suitably determined by the plate thickness of a plate, etc.

The fastener 30 is made of a material equivalent to the heat-resistant metal material constituting the plate assemblies 17, 18. Any position may be sufficient as the attachment position by the fixture 30, and in FIG. 5, only one position is attached in the position which opposes the side plate 22b to the 1st side wall plate 21. As shown in FIG. About the mounting position of the fixture 30, it can mount through the required number of fixtures 30 in arbitrary positions of the bottom plate 22a and the side plate 22b according to the assembly strength required for each plate assembly 17,18, etc. have.

The third cover plate 22A includes a half width direction half of the bottom plate 22a and the side plate 22b (that is, half width direction of each plate along the flow direction of the flow path R2) of the first bottom wall plate 20. The edge portion of the first bottom wall plate 20 and the edge portion of the first side wall plate 21 are covered with the edge portion of the first bottom wall plate 20 and the edge portion of the first side wall plate 21. It protrudes from and is attached to the end side of the first side wall plate 21.

In the third cover plate 22A, the length of the bottom plate 22a along the width direction of the flow path R2 is slightly longer than the width of the first bottom wall plate 20 along the same direction, and the flow path R The height of the side plate 22b along the depth direction of is equal to the height of the first side wall plate 21 along the same depth direction.

The said 3rd cover plate 22B consists of the bottom plate 22c and the side plate 22d, and is formed in L shape. The 3rd cover plate 22B is provided along the boundary part of the bottom plate 22c and the side plate 22d in the butt | matching part of the 2nd bottom wall plate 25 and the 2nd side wall plate 26. As shown in FIG.

In more detail, the 3rd cover plate 22B covers the half edge part of the 2nd bottom wall plate 25 and the edge part of the 2nd side wall plate 26, and the other half of the said width direction half, A width of the degree is projected from the edge portion of the second bottom wall plate 25 and the edge portion of the second side wall plate 26, and is attached to the second side wall plate 26 by a fixture 30 such as a rivet. .

The length of the bottom plate 22c along the width direction of the flow path R2 is slightly shorter than the width of the second bottom wall plate 25 along the same direction, and the length of the side plate 22d along the depth direction of the flow path R2. The height is equal to the height of the second side wall plate 26 along the same depth direction.

The second cover plate 23 is formed in a narrow rectangular shape having a width equivalent to that of the third cover plates 22A and 22B, and covers the half of the width direction on the long side of the first bottom wall plate 20, and the rest of the second cover plate 22A and 22B. Half is projected from the long side of the first bottom wall plate 20, and is attached to the first bottom wall plate 20 by means of fasteners 31 such as rivets. The total length of the long side of the second cover plate 23 is formed to be slightly shorter than the total length of the long side of the first bottom wall plate 20, and the one end 23a side of the second cover plate 23 is described above. In the case where the side edge of the bottom plate 22a is along, the other end 23a is disposed slightly inward of the end of the first bottom wall plate 20. Therefore, the edge part 20a of the 1st bottom wall plate 20 which is not covered with this 2nd cover plate 23 is exposed to the outer side of the edge part 23a of the 2nd cover plate 23. As shown in FIG.

The fourth cover plate 24 is made of an L-shaped plate in plan view, provided with a square plate-shaped body portion 24a and protrusions 24b and 24c extending on two adjacent sides thereof. The fourth cover plate 24 is made of a heat-resistant metal material equivalent to the cover plates 22A, 22B, and 23. The 4th cover plate 24 is a corner part of the rectangular 1st bottom wall plate 20, and is fasteners, such as a rivet, so that the abutting part of the 3rd cover plate 22A and the 2nd cover plate 23 may be covered. It is attached by 32. The mounting direction of the fourth cover plate 24 is a direction in which the protrusion 24b is pulled away from the end of the third cover plate 22A toward the width direction of the flow path R2, and the protrusion 24c is moved in the direction of the flow path R2. It faces toward the direction away from the 2nd cover plate 23 toward the flow direction downstream.

As shown in FIG. 5, when the four plate assemblies 17, 17, 18, and 18 are disposed to face each other, the fourth cover plate 24 includes the corner portions of the bottom wall plates 20 and 20 and the bottom wall plate 25. The butt area of the corner portion of 25) is arranged to be covered by some width.

The 1st plate assembly 17 and the 1st plate assembly 18 demonstrated above are arrange | positioned so that it may adjoin to the left and right of the width direction of the flow path R2. As shown in FIG. 5, the first plate assembly 17 and the first plate assembly 18 adjoin the long side of the first bottom wall plate 20 and the long side of the second bottom wall plate 25, and therebetween. It is provided on the bottom wall part 4a of the flow path R2 with the clearance gap D1.

Most of the gap D1 between the first plate assembly 17 and the first plate assembly 18 is covered by the second cover plate 23 in plan view. In addition, the protrusion 24b of the fourth cover plate 24 mounted on the first plate assembly 17 is placed on the end of the bottom plate 22c of the third cover plate 22B adjacent thereto to form the bottom plate. The end of 22b is covered in plan view.

The said gap D1 is a case where the 1st bottom wall plate 20 and the 2nd bottom wall plates 25 thermally expand in the width direction of the flow path R2 according to the temperature of the molten glass G which flows through the flow path R2. It is formed for absorbing the expanded content of.

Although the cover assembly 16 can be comprised by arrange | positioning the 1st plate assembly 17 and the 2nd plate assembly 18 as mentioned above, the edge of the cover assembly 16 located downstream of the flow path R2. All of the sides can be viewed in a plan view and covered by the first cover plate 22 by the third cover plates 22A and 22B and the fourth cover plate 24 so that there is no gap.

Next, as shown in FIG. 4 or 5 along the flow direction of the flow path R2, the some cover assembly 16 is arrange | positioned and connected in the same direction, and the inner surface cover 15 is comprised.

More specifically, the third cover plate 22A, 22B and the fourth cover plate 24 are disposed at the end portion of the downstream side of any one cover assembly 16 along the flow path R2. The cover to which other cover assembly 16 which should be installed downstream from the cover assembly 16 should be arrange | positioned in the same direction, and the upstream side edge part of the cover assembly 16 which should be arrange | positioned downstream may be arrange | positioned upstream. The plurality of cover assemblies 16 are sequentially arranged in the flow direction of the flow path R2 by being fitted so as to be fitted to the downstream edge portion of the assembly 16.

Although the 3rd cover plate 22A, 22B and the 4th cover plate 24 exist in the edge part of the downstream of the upstream cover assembly 16, the 3rd cover plate 22A or 22B is present. A gap corresponding to each plate is formed between the bottom wall portion 4a of the flow path R2 and the fourth cover plate 24 and the side wall portion 4b, respectively, so that the gap is downstream using these gaps. The upstream side edge part of the cover assembly 16 of the side can be pinched | interposed, and they can be mutually arrange | positioned. Upon engagement of the cover assemblies 16, 16, a slight gap D2 is formed between the upstream cover assembly 16 and the downstream cover assembly 16 as shown in FIG. 5. That is, a gap D2 is formed between the first bottom wall plate 20 of the cover assembly 16 on the upstream side and the first bottom wall plate 20 of the cover assembly 16 on the downstream side, and the upstream cover is formed. A gap D2 is formed between the second bottom wall plate 25 of the assembly 16 and the second bottom wall plate 25 of the cover assembly 16 on the downstream side.

These gaps D2 are formed for absorbing thermal expansion content when the first bottom wall plate 20 and the second bottom wall plate 25 are thermally expanded by the molten glass G flowing through the flow path R. As shown in FIG.

Next, in the case where the plurality of cover assemblies 16 are bonded together to form the inner surface cover 15, the positional relationship between the inner surface cover 15 and the side wall portion 4b constituting the flow path R2 will be described.

When the inner cover 15 is configured, the bottom wall plates 20 and 25 of the cover assembly 16 are installed on the bottom wall portion 4a so as to cover the bottom wall portion 4a of the flow path R2, and the cover assembly 16 ), Side wall plates 21 and 26 are provided along side wall portion 4b to cover side wall portion 4b of flow path R2. About the tooth parts 21a and 26a which protrude outside the cover assembly 16, it inserts into the wood part 4B which is a joining boundary of the firebrick 4e which comprises the flow path R2.

By this structure, the 1st side wall plate 21 and the 2nd side wall plate 26 can be stably supported by the side wall part 4b. In addition, the slit 4s is formed on the flow path R2 side of the firebrick 4e, not the wood part 4B of the firebrick 4e as an insertion position of the teeth part 21a, 26a, and this slit 4s ) May be adopted a structure in which the teeth 21a, 26a are inserted into and supported.

In addition, in order to support the side wall plates 21 and 26 of the cover assembly 16, for example, as shown in FIG. 5, bolt-like fasteners made of heat-resistant metal such as Mo or W so as to pass through the fire brick 4e ( A structure in which the side wall plates 21 and 26 of the cover assembly 16 are separately supported by installing a support member 35 and penetrating and fixing the fastener 35 through the necessary portions of the side wall plates 21 and 26. You may employ | adopt.

As long as the glass products manufactured using the glass manufacturing apparatus 1 of this embodiment are molded articles, such as glass plates manufactured by the glass plate manufactured by the float method, the roll out method, the down-draw method, etc., a blow method, etc., Grades are not limited. Therefore, any of soda-lime glass, mixed alkali type glass, borosilicate glass, or an alkali free glass may be sufficient. Moreover, the use of the glass goods manufactured is not limited to building use and a vehicle use, A flat panel display and other various uses are mentioned.

In the case of soda-lime glass used for glass plates for construction or vehicles, SiO ₂ : 65 to 75%, Al ₂ O ₃ : 0 to 3%, CaO: 5 to 15%, MgO: 0 to 15%, Na ₂ O: 10 to 20%, K ₂ O: 0 to 3%, Li ₂ O: 0 to 5%, Fe ₂ O ₃ : 0 to 3%, TiO ₂ : 0 to 5%, CeO ₂ : 0 to 3%, BaO: 0 to 5%, SrO: 0 to 5%, B ₂ O ₃ : 0 to 5%, ZnO: 0 to 5%, ZrO ₂ : 0 to 5%, SnO ₂ : It is preferable to have a composition of 0 to 3% and SO ₃ : 0 to 0.5%.

For the alkali-free glass used in the substrate for a liquid crystal display or for an organic EL display has, by mass percent shown in the oxide _{basis, SiO 2: 39 ~ 75%} , Al 2 O 3: 3 ~ 27%, B 2 O 3 It is preferable to have a composition of 0 to 20%, MgO: 0 to 13%, CaO: 0 to 17%, SrO: 0 to 20%, and BaO: 0 to 30%.

In the case of mixed alkali-based glass used for a substrate for plasma display, in terms of mass percentage on an oxide basis, SiO ₂ : 50 to 75%, Al ₂ O ₃ : 0 to 15%, MgO + CaO + SrO + BaO + It is preferable to have a composition of ZnO: 6 to 24% and Na ₂ O + K ₂ O: 6 to 24%.

As other uses, in the case of borosilicate glass used for a heat-resistant container or a chemical instrument, SiO ₂ : 60 to 85%, Al ₂ O ₃ : 0 to 5%, B ₂ O ₃ : It is preferable to have a composition of 5 to 20% and Na ₂ O + K ₂ O: 2 to 10%.

In order to install the inner surface cover 15 of the structure mentioned above in the flow path R2 of the 2nd clarification tank 4, as shown in FIG. 7 as an example previously, the 1st bottom wall plate 20 and the 1st side wall plate 21 are shown. ), The third cover plate 22A and the fourth cover plate 24 are riveted and mounted as the first plate assembly 17 in the state shown in FIG. 7. Moreover, the 2nd bottom wall plate 25, the 2nd side wall plate 26, and the 3rd cover plate 22B are riveted, and it mounts as the 2nd plate assembly 18 of the state shown in FIG.

A plurality of these first plate assemblies 17 and second plate assemblies 18 are prepared and matched in the directions shown in FIG. 7, and these are sequentially arranged in the flow path R2 of the second clarification tank 4 in FIGS. 4 and 5. As shown, by spreading and covering the front surface, the flow path R2 can be covered with the cover assembly 16 one by one.

In addition, in the case of forming the side wall part 4b by joining a plurality of fire bricks 4e for constituting the side wall part 4b of the 2nd clarification tank 4 through the wood part 4B, each cover assembly ( By constructing the second clarification tank 4 while inserting the teeth 21a, 26a of 16 into the wood portion 4B, the inner cover 15 can be constructed simultaneously with the construction of the second clarification tank 4. .

In addition, also in the cooling tank 5, the 1st plate assembly 17 and the 2nd plate assembly 18 are similarly prepared, and are matched in the direction shown in FIG. 7, and these are flow path R3 of the cooling tank 5 sequentially. 4 and 5, the flow path R3 can be covered with the inner surface cover 15 by laying it on the front surface and superimposing it.

By the way, in the above description, although the structure which spread | covered and arrange | positioned the cover assembly 16, 16 in order on the front side toward the cover plate 22 downstream of the flow path R2, R3 was demonstrated, the flow path R2, It is good also as a structure which spread | discovered the cover assemblies 16 and 16 on the whole surface one by one toward the cover plate 22 in the upstream of R3), and the arrangement direction of the cover assembly 16 is not limited in this invention.

Next, the method of manufacturing a glassware using the manufacturing apparatus 1 of the glassware provided with the 2nd clarification tank 4 provided with the inner surface cover 15 mentioned above, and the cooling tank 5 is described below. Explain.

In the manufacturing apparatus 1 of this embodiment, in a melting tank 2, a glass raw material is fuse | melted, the molten glass G is produced, this molten glass G is circulated in the melting tank 2, etc. After employing the following technique, the bubble is removed to some extent and then moved to the first clarification tank 3. The process of melting a glass raw material in the melting tank 2 and forming a molten glass is called glass melting process S1, as shown in FIG.

In the 1st clarification tank 3, it carries out electricity supply heating using the electrode 8, and adjusts and clarifies the temperature of a molten glass to the high temperature of the range of about 1420-1510 degreeC. By maintaining in the high temperature range of this range, a bubble is grown by the effect of the clarifier contained in the component of molten glass G, etc., and bubble removal is performed. Moreover, since the viscosity of molten glass G falls by heating to high temperature of this range, foam | bubble also grows easily and it becomes easy to float and fall out.

In the case of energizing and heating the plurality of electrodes 8, as shown in FIG. 2 as an example, when the 12 electrodes 8 are arranged in 6 × 2 rows in a planar view in the first clarification tank 3, In order to carry out three-phase alternating current energization, as shown by an arrow, R phase, T phase, and S phase may be selected by the pair shown by the arrow between diagonally adjacent electrodes 8, and the three phases may be energized sequentially. In addition, the other example of the electricity supply heating to these electrodes 8 is explained in full detail in subsequent embodiment.

In the case where the plurality of electrodes 8 are energized, the molten glass G present and heated around the electrode 8 is heated to a higher temperature than the molten glass G therein and heated to a higher temperature. Flows upward along the electrode 8 to produce convection of the molten glass G around the electrode 8, so that partial convection of the molten glass G is generated inside the first clarification tank 3. . Thereby, partial circulation flow of the molten glass G is produced | generated inside the 1st clarification tank 3. And among these circulation flows, it is located in the exit port 3h side of the 1st clarification tank 3, and the molten glass G of the side near liquid level GH becomes a center, and is transferred to the 2nd clarification tank 4 side. do. In addition, in order to remove bubbles efficiently in the second clarification tank 4 as described later without heating, the temperature of the molten glass G is at the outlet port 3h side of the first clarification tank 3. It is preferable to sequentially heat the plurality of electrodes 8 so as to be the highest (i.e. at the highest achieved temperature).

Here, for example, when setting the temperature of the molten glass G in the 1st clarification tank 3 to the range of 1420-1510 degreeC, the temperature of the molten glass G in the exit port 3h side. It is preferable to conduct electricity control of each electrode 8 so that it may become 1510 degreeC which is the maximum temperature.

In addition, in this embodiment, it is soda-lime glass to set the upper limit temperature (maximum reached temperature) of the exit port 3h side of the molten glass G in the 1st clarification tank 3 to 1510 degreeC. SO ₃ as a clarifier Is an example of the molten glass (G) containing about 0.2% by mass, and SO ₃ In the case of containing less than 0.2 mass%, the highest achieved temperature on the outlet port 3h side is set higher, and SO ₃ When it contains more than 0.2 mass%, what is necessary is just to set the highest achieved temperature of the exit port 3h side lower. Thus, although the highest achieved temperature of the exit port 3h side in the 1st clarification tank 3 can be set suitably according to the composition of the molten glass G to apply, it is a temperature which does not refob anyway as much as possible. It is desirable to set it at a high temperature. The reason for temperature control in this way is that the molten glass G is not actively heated in the next second clarification tank 4, and as described later, in the second clarification tank 4, it is downstream from the upstream side. This is to smoothly remove bubbles as much as possible when creating a bubble to create a uniflow state toward the bubble.

After performing bubble removal to some extent in the 1st clarification tank 3, a molten glass is guide | induced to the 2nd clarification tank 4, and a clarification process is further performed and bubble removal is carried out.

When the molten glass moves from the first clarification tank 3 to the second clarification tank 4, there is a certain depth in the first clarification tank 3, so that it is energized and heated by the plurality of electrodes 8, so that the molten glass moves. Although the convection of the glass G is partially generated, the second clarification tank 4 is shallow, and since the molten glass G is not basically heated, the return flow of the molten glass is basically not generated. 2 Cool the molten glass along the clarification tank 4 by generating a constant flow from the inlet port 4h side (upstream side) toward the outlet port 4i side (downstream side) (ie, in a uniflow state). To the side of the tank (5).

The uniflow state is described below. Generation | occurrence | production of natural convection by the temperature difference of an upstream side and a downstream side as a cause which inhibits a uniflow in the flow path of the 2nd clarification tank 4 is mentioned. Specifically, since an upward flow occurs on the upstream side of the high temperature and a downstream flow occurs on the downstream side of the low temperature, natural convection in the return direction is likely to occur at the bottom. When the intensity | strength of the molten-glass mainstream is large enough by the intensity | strength of this natural convection, the flow of the uniflow which is a flow of one direction but a flow rate is different over the depth direction of a molten glass arises. On the other hand, when the intensity | strength of natural convection is not large enough than the intensity | strength of molten glass liquor, a flow reverse to mainstream will arise in the bottom part.

In general, the ratio of the strength of natural convection to the force of forced convection is expressed by the ratio Gr / Re ² of the Grashof number Gr to the Reynolds number Re, that is, the ratio of buoyancy and inertia. Therefore, this ratio was adopted as a uniflow parameter in which uniflow occurs. In the design of a 2nd clarification tank, by using this uniflow parameter, the flow velocity of a molten glass, the temperature change of the molten glass in the inlet and outlet of the flow path of a molten glass, and the depth of a molten glass are set, and it is a uniflow state Can be realized.

By setting it as the flow of this uniflow state, the bubble remaining in the 1st clarification tank 3 is efficient without generating the flow of the molten glass returned to the 1st clarification tank 3 in the 2nd clarification tank 4. You can deflate with.

The ratio range of Gr / Re ² of the square of the uni-flow conditions can Grass hop for generating a Gr and Reynolds number Re is, 11420 is more preferable, because less is preferable, and 6500 or less to form a strong uni-flow.

About this range, since the shape of a 2nd clarification tank is simple, it is set as the hexagonal three-dimensional shape, and the average temperature of the molten glass in the inlet of a clarification tank and the melting of an exit are made using the physical property of general soda-lime glass. Calculation of 51 cases in which Uniflow parameters were changed in the range of 370 to 40148 by performing general three-dimensional tropical flow analysis using three of the difference of the average temperature of glass, the average flow velocity of molten glass, and the depth of a clarification tank as a parameter. Was obtained by conducting.

In addition, about the kinematic viscosity of a molten glass, it computed as a function by the temperature of a molten glass. In addition, in realizing a uniflow state, it is not limited to the said method, You may set by other methods.

The temperature of the 2nd clarification tank 4 becomes about 1500 degreeC by the exit side about 1510 degreeC on the inlet port 4h side, and can clarify the fusion glass by this high temperature process. That is, bubbles in the molten glass G can be grown and floated smoothly, bubbles can be broken at the liquid level position GH, and bubbles can be removed.

Since the above-mentioned inner surface cover 15 is provided in this 2nd clarification tank 4, although the effect by the inner surface cover 15 is acquired, the detail of an effect is demonstrated later.

In the cooling tank 5, the molten glass bubbled out in the 2nd clarification tank 4 is cooled to the shaping | molding temperature area | region so that this molten glass can be shape | molded. More specifically, in the said cooling tank 5, the said molten glass is cooled from the temperature of about 1500 degreeC on the inlet side to the temperature of about 1200 degreeC on the exit side. The stirring apparatus 9 is provided in the cooling tank 5, and while cooling is promoted by stirring, cooling apparatuses, such as a water cooling tube, can be provided as needed, and cooling can be promoted.

In this embodiment, as shown in FIG. 8, the process of clarifying in the 1st clarification tank 3 and the 2nd clarification tank 4, and cooling and adjusting to the shaping | molding temperature area | region so that a molten glass can be shape | molded is shown. It is called clarification process S2.

The molten glass cooled to about 1200 degreeC in the cooling tank 5 is formed on the bed layer 10 of molten tin in the shaping | molding apparatus 6 of the next process, for example, in the case of the float glass plate manufacturing method. It can diffuse and cool again, and it can be set as plate glass. In this Example, the process of shape | molding plate glass using the shaping | molding apparatus 6 is called shaping | molding process S3, as shown in FIG.

Subsequently, as shown in FIG. 8, by performing the slow cooling process S4 which cools plate-shaped glass to the temperature near normal temperature, and performing cutting process S5 which cut | disconnects to the target size, the target glass product is shown in FIG. You get G6.

In the manufacturing process of the above glass product G6, in this embodiment, the temperature of the grade which does not re-foam the temperature of the molten glass G by the electricity supply heating by the some electrode 8 in the 1st clarification tank 3. As a high temperature, for example, it is heated so that it may be about 1510 degreeC in the exit side of the 1st clarification tank 3, for example. As an example of a temperature distribution in the 1st clarification tank 3, it can heat with the electrode 8 so that it may become high temperature gradually from an inlet side to an outlet side so that it may become 1420 degreeC on an inlet side, and 1510 degreeC on an outlet side.

In the 2nd clarification tank 4, while the flow of the molten glass G in the 2nd clarification tank 4 becomes a one-way flow and a uniflow state along the flow path R2, the 2nd clarification tank 4 Since the molten glass G moved to) is high temperature at 1500-1510 degreeC, the molten glass (bubbleed) efficiently degassed from molten glass G which becomes high temperature in a uniflow state as a result. G) can be transferred to the next cooling tank 5.

Moreover, in this embodiment, the inner surface cover 15 made of heat resistant metal is provided in the 2nd clarification tank 4 and the cooling tank 5. As shown in FIG.

In the 2nd clarification tank 4, since the inner surface cover 15 covers the inner wall side of the bottom wall part 4a and the side wall part 4b which comprise the flow path R2 of molten glass G, the bottom wall part ( Direct contact between the refractory brick constituting 4a) and the side wall portion 4b and the molten glass G can be minimized as much as possible, so that dissociation of foreign components from the refractory brick to the molten glass G side can be suppressed.

In the cooling tank 5, since the inner surface cover 15 covers the inner wall side of the bottom wall part 5a and the side wall part 5b which comprise the flow path R3 of molten glass, the bottom wall part 5a and the side wall part ( Direct contact between the refractory bricks (G) constituting 5b) and the molten glass is minimized as much as possible, and it is possible to suppress the dissolution of foreign components from the refractory bricks to the molten glass G side.

Therefore, even when the clarification of the molten glass G is performed continuously for a long time, production of the molten glass G without causing elution of foreign components from the refractory brick to the molten glass G flowing through the flow paths R2 and R3. Can be carried out. Therefore, the high quality molten glass G of uniform composition is transferred to the next process, and it can shape | mold by the shaping | molding apparatus 6, and high quality glass product G6 can be obtained.

Moreover, the process of grinding | polishing the molten glass after shaping | molding can be set as needed, and the glass product which polished the surface can also be manufactured.

By the way, with respect to the flow paths R2 and R3 provided with the inner surface cover 15 made of Mo in the second clarification tank 4 and the cooling tank 5, the molten glass G is first opened at the start of production of the molten glass. When flowing, since air exists in these tanks, when the inner surface cover 15 is heated to 500-600 degreeC or more, it is necessary to prevent the inner surface cover 15 from burning.

In order to prevent the combustion of the inner surface cover 15 at the start of production, it is preferable to form a coating layer so that Mo does not come into contact with air on the entire surface of the inner surface cover 15. As this coating layer, a silica coat film can be employ | adopted, for example. Since the silica coat film should just prevent the reaction of Mo and air until the molten glass G covers the whole of the inner surface cover 15 at the start of production of molten glass, the molten glass G covers the inner surface cover 15 The film is coated with a film thickness sufficient to withstand the time until the whole of the sheet is covered. After the molten glass G covers the whole of the inner surface cover 15, the silica coat film melts and disappears with time, and after that, the molten glass G covering the inner surface cover 15 covers the inner surface from air. Isolate (15).

Next, the effect of the inner surface cover 15 of this embodiment is further demonstrated.

In the inner surface cover 15 covering the inner surfaces of the flow paths R2 and R3 as described above, the gap D1 is formed between the first bottom wall plate 20 and the second bottom wall plate 25, and the flow path The clearance gap D2 is formed between the cover assemblies 16 and 16 which adjoin before and behind the flow direction of R2.

The coefficient of thermal expansion is different in the thermal expansion coefficient of the refractory brick 4e constituting the bottom wall portion 4a and the side wall portion 4b of the flow path R2 and the inner surface cover 15 made of heat-resistant metal such as Mo. When molten glass G flows through flow path R2 and R3, each plate which comprises the inner surface cover 15 expands more than the refractory brick 4e with few thermal expansion rates. Here, since the clearance gaps D1 and D2 are formed in the inner side cover 15 on the inner side thereof, the thermal expansion content of each plate constituting the inner surface cover 15 can be absorbed by the gaps D1 and D2, and the molten glass By (G), unnecessary thermal stress can be prevented from being added to the inner surface cover 15 brought into a heated state. Therefore, even if the molten glass is manufactured using the 2nd clarification tank 4 and cooling tank 5 provided with the inner surface cover 15 continuously, unnecessary burdens, such as a thermal stress, do not act on the inner surface cover 15.

In addition, the following effects can be obtained by inserting the teeth 21a and 26a of the cover assembly 16 of the present embodiment into the wood portion 4B or the slit 4s of the firebrick 4e around it. .

When molten glass G flows along the flow path R2, the molten glass G flows through the flow path R2 of the inner surface side of the inner surface cover 15, and the bottom wall part 4a and the side wall of the flow path R2 A small amount of molten glass G flows into the portion 4b and the gap portion on the rear surface side of the inner surface cover 15.

Here, even if it covers the surface of the bottom wall part 4a of the flow path R2, and the surface of the side wall part 4b by engaging the some cover assembly 16, the inner surface cover 15 is flow path R2. The bottom surface and the side surface of the inner surface cover 15 are not in close contact with the inner surface of the surface. In addition, since the upper end of the side wall plates 21 and 26 of the inner surface cover 15 is in a position lower than the liquid surface GH of the molten glass, and the clearance gaps D1 and D2 are inherent in the inner surface cover 15, Some molten glass G also returns to the back of the inner surface cover 15.

Since the molten glass G which flowed in between the bottom wall part 4a and the side wall part 4b of the flow path R2, and the inner surface cover 15 directly contacts the bottom wall part 4a and the side wall part 4b, it is a bottom wall part. In contact with the refractory bricks constituting the 4a and the side wall portions 4b, and by long-term operation, the refractory bricks may be corroded, or some of the components constituting the refractory bricks may elute to the molten glass side to contaminate the molten glass. There is. However, the molten glass G which flowed in between the bottom wall part 4a and the side wall part 4b, and the back surface side of the inner surface cover 15 has the quantity very much with respect to the mainstream of the molten glass which flows inside the flow path R2. In addition, since molten glass which flowed into the back surface side of the inner surface cover 15 does not return easily to the flow path R2 side, molten glass G which flows through the flow path R2 of the inner surface cover 15 inside. The possibility that the contaminated molten glass G, which is slightly present on the rear side of the inner surface cover 15, will be affected is lowered.

Moreover, in some cases, the molten glass G which flowed in between the bottom wall part 4a and the side wall part 4b, and the back surface side of the inner surface cover 15 is going to move along the flow direction of the flow path R2. do. However, since the part 21a, 26a exists intermittently in several places in the longitudinal direction of the inner surface cover 15, the molten glass G is downstream of the flow path R2 through the back surface side of the inner surface cover 15. FIG. The teeth 21a and 26a block the flow which is going to move to the side. As a result, the molten glass G of the back surface side of the inner surface cover 15 high in contact with the side wall part 4b and having high possibility of being contaminated is not conveyed to the downstream side of the flow path R2.

For this reason, there is no possibility of conveying the contaminated molten glass to the shaping | molding apparatus 6 provided in the downstream of the 2nd clarification tank 4 and the cooling tank 5, and the bubble of the uniform composition which does not contain an impurity. There is an effect that the molten glass of low quality can be transferred to the molding apparatus 6 and molded.

In addition, the area | region in which the inner surface cover 15 demonstrated so far is taken into consideration about the temperature of about 1200 degreeC or less in which dissolution of a foreign substance does not arise from a firebrick, and about the area | region where molten glass temperature becomes 1200 degreeC or more. It is desirable to install. By covering this area with the inner surface cover 15, it is possible to prevent elution of foreign components from the refractory bricks.

9 shows an example of an apparatus for producing a glass article with a clarification tank according to a second embodiment of the present invention, and FIG. 10 shows an example of a state in which the main part of the apparatus for producing a glass article with the clarification tank is viewed in plan view. Indicates.

The manufacturing apparatus 55 of the glassware of this embodiment is equipped with the glass melting furnace 56 which has the melting tank 2 and the clarification tank 57. The clarification tank 57 in the glass melting furnace 56 has a structure substantially equal to the clarification tank 7 of the first embodiment. In the clarification tank 57 of this embodiment, the arrangement | positioning of the electrode 8 arrange | positioned in the 1st clarification tank 3 and the energized state with respect to these some electrodes 8 with respect to the previous 1st embodiment. Are different, and the point where the 2nd drain-out part 3i is formed in the bottom wall part 3a of the 1st clarification tank 3 differs, and it is made in the outlet port 4i side of the 2nd clarification tank 4, and The point which 1 convex part 4j is formed is different.

In the first clarification tank 3 of this embodiment, in addition to the drain out part 3e formed in the bottom part of the outlet port 3h side (downstream end side) of the flow path R1, the inlet port 3f is more than that. The drain out part 3i is formed in the () side (upstream side). The drain-out part 3i is formed in the same manner as the drain-out part 3e in the plural (four in the embodiment shown in Fig. 10) at predetermined intervals in the width direction of the first clarification tank 3. .

In the structure of this embodiment, four electrodes 8 arrange | positioned at the 1st clarification tank 3 are arrange | positioned 12 in total by three rows. Of these, three x three rows of nine electrodes 8 in total are arranged between the inlet port 3f and the drain out portion 3i, and the remaining three electrodes 8 are drained out portion 3i and the drain. It is arrange | positioned between the out parts 3e. In addition, the number of electrodes changes with the quantity of the molten glass melt | dissolved, the width of a clarification tank, etc., and can be set suitably.

In 2nd Embodiment, as shown in FIG. 10, four electrodes 8 of each row arrange | positioned along the longitudinal direction of the flow path R1 are introduce | transduced out of the 12 electrodes 8 arranged in three rows by four in planar view. In order from the sphere 3f side, the first electrode 8 is an R-phase electrode, the second electrode is a T-phase electrode, the third electrode 8 is an S-phase electrode, and the fourth electrode 8 is It is an R phase electrode.

In addition, in the present embodiment, as shown in FIG. 10, of the 12 electrodes 8 arranged in three rows of four in plan view, four electrodes 8 in each column aligned along the longitudinal direction of the flow path R1 are provided. In order from the inlet 3f side, the first electrode 8 is an R-phase electrode, the second electrode is an S-phase electrode, and the third electrode 8 is a T-phase electrode, the fourth electrode 8 It may be this R phase electrode.

In the arrangement of the three-phase electrodes shown in FIG. 10 up and down, they are arranged in a combination that sets the phase difference between adjacent electrodes to 120 degrees, specifically, the order from the left side (that is, upstream side of the first clarification tank 3). As such, the three-phase electrode arrangement arranged in the R-phase, S / T-phase, S / T-phase, and R-phase sequence is more melted than the three-phase electrode arrangement arranged in the R-phase, S-phase, T-phase, and R-phase in order from the left. The current density applied to the surface of glass G can be made low and uniform.

Moreover, if it is a three-phase electrode arrangement arrange | positioned in the order of R phase, S / T phase, S / T phase, and R phase which are arrangement | positioning of the combination which makes the phase difference between adjacent electrodes 120 degrees in order from the left shown in FIG. In order, the current density applied to the surface of the molten glass G in the electrode 8 can be made into a lower value than the three-phase electrode arrangement | positioning arrange | positioned in R phase, S phase, T phase, and R phase. About a current density, it can determine suitably according to the quantity of the molten glass to manufacture, and the molten glass temperature in the required melting tank.

In the arrangement of the electrodes 8 shown in FIG. 10, when the R phase, the S phase, and the T phase are disposed, the three-phase diagram shown in FIG. 10 is examined as a result of examining whether the heating can be conducted with low consumption of the electrode 8. It is understood that in the case of the three-phase electrode arrangement in which the inter-electrode phases are arranged in order from the left side of the R-S phase, the T-S phase, and the T-R phase in order, the current density of the second electrode surface region can be reduced. Could. The fact that current density can be reduced means that consumption of an electrode becomes small when the glass melting furnace which continuously operates for a long time like molten glass production is assumed.

Moreover, the current density was computed about the electrode array of 6x2 rows of the structure shown in FIG. As a result, the average current density in the case of energizing like an X-type arrow of four pairs of electrodes on the upstream side of the first clarification tank 3 is 0.69 A / cm 2 between the electrodes indicated by arrow S ₁ and arrow S _2. as shown between electrodes in 0.62 a / ㎠, an arrow S in the inter-electrode indicated by ₃ 0.66 a / ㎠, arrow S ₄ in the inter-electrode shown in the inter-electrode represented by 0.64 a / ㎠, arrow S ₅ 0.92 a / ㎠, arrows in between the electrodes shown in S ₆ it was the result of 0.67 a / ㎠.

From this result, since the electrode of the high current density of 0.92 A / cm <2> generate | occur | produced in the electrode array of FIG. 2, it turns out that it is disadvantageous in terms of current density than the structure of the electrode array of FIG.

In the above structure, the drain out parts 3e and 3i are formed before and after the electrode 8 on the outlet port 3h side of the first clarification tank 3, but before and after the electrode 8 If (3e, 3i) is formed, the upward flow of the molten glass which arises around these electrodes 8 can be suppressed. Thereby, when the molten glass G with low temperature stayed in the bottom side of the outlet port 3h of the 1st clarification tank 3, the foreign material from a furnace material is contained in the molten glass G which stays. Even if it is, the contaminated molten glass G can be discharged from the drain out portions 3e and 3i without being fed to the second clarification tank 4 side.

Next, in the clarification tank 57 of 2nd Embodiment, the side wall part (on both sides of the width direction both ends of the outlet port 4i side (downstream end side) of the bottom wall part 4a of the 2nd clarification tank 4). The 1st convex part 4j is formed so that it may contact 4b).

This 1st convex part 4j is a rectangular parallelepiped shape (block shape) which is narrow along the flow path R2 in the downstream end side of the bottom wall part 4a, as shown to FIG. 11 (A) as a 1st example, and a flow path ( It is formed at the height of about a few of the depth of the molten glass G (that is, the liquid surface height GH of the molten glass) which flows through the flow path R2 as the width | variety of the width | variety of R2). . 11 (A) is a longitudinal cross-sectional perspective view in which the flow path R2 of the second clarification tank 4 and the flow path R3 of the cooling tank 5 are cross-sectionalized along the width direction center of these flow paths, The half width | variety area | region of the flow path R2 and R3 is shown. Also in the following FIG.11 (B)-(F), the position seen from the cross section is the same.

About the 1st convex part 4j, the 1st convex part 4k of the rectangular parallelepiped shape shown to FIG. 11 (B) formed slightly wider than the shape shown to FIG. 11 (A) may be sufficient, and it is shown to FIG. 11 (C). Similarly, the first convex portion 4l having a wider rectangular parallelepiped shape may be sufficient, or the first convex portion 4m on the substantially square block may be as shown in Fig. 11D. Moreover, as shown to FIG. 11E, the 1st convex part 4n which occupies the full width along the flow path R2 in the exit port side (downstream end side) of the bottom wall part 4a may be sufficient. Moreover, as shown to FIG. 11 (F), after forming the 1st convex part 4p in the width direction both ends side of the outlet port 4i side of the rectangular parallelepiped bottom wall part 4a, the 1st convex part ( The structure which formed the rectangular-shaped 2nd convex part 4r in contact with the side wall part 4b in the inlet port 4h side (upstream side) rather than the formation position of 4p) may be sufficient.

About the said 1st convex part 4j-4p and the 2nd convex part 4r, a bubble is contained inside the molten glass G which moves the flow path R2 of the 2nd clarification tank 4 If there is, the bubble is formed so as to easily grow and float, and to suppress the bubble from moving to the bottom side of the molten glass G.

That is, the molten glass G heated at the maximum temperature in the 1st clarification tank 3 in the exit port 3h side of the 1st clarification tank 3 is the 2nd clarification tank maintaining the temperature. (4) flows in. In the second clarification tank 4, the molten glass G flows as shown by the arrow F of FIG. 11 (A) toward the discharge port 4i side along the flow path R3 in a uniflow state, without heating. Here, the molten glass G which flows in the area | region side which contacts the side wall part 4b of the 2nd clarification tank 4, ie, the width direction both ends side of the flow path R2, has more rows by the side wall part 4b. The temperature is lowered faster than the molten glass G that flows through the central portion side of the flow path R2 because it is taken away. That is, as a result of the molten glass G at the both ends of the width direction of the flow path R2 becoming lower temperature, the molten glass G of the lower temperature from the upper part of the area | region to the lower side at the width direction both ends of the flow path R2. The sinking and sinking flow is generated, and by this downward flow, bubbles attempting to escape to the liquid level side are attempted to move to the bottom side of the molten glass G.

When sinking as mentioned above in the molten glass G which flows through the width direction both ends of the flow path R2 arises, a bubble rises to a liquid surface, and the bubble to be destroyed and disappear | disappears is lost, The cooling tank 5 ) May move to the side. In order to suppress such a phenomenon, the 1st convex part 4j-4p mentioned above and the 2nd convex part 4r are formed.

If these 1st convex parts 4j-4p and 2nd convex part 4r are formed in the downstream end side of the bottom wall part 4a, the molten glass G of a uniflow state will contact these convex part, Along the circumferential surface, an upward flow is formed in the flow in the direction of return and bypass and the flow of some molten glass G. As a result, even if the molten glass G which is going to sink is going to attract a bubble to the bottom side, since this bubble can move to the liquid level side according to an upward flow, a bubble is moved near the liquid level of the cooling tank 5 Since it can produce the flow which moves to the inside, and can bubble out at a liquid level and bubble may be destroyed, the bubble contained in the molten glass G of the cooling tank 5 can be reduced. In addition, since the flow velocity of the flow generated in the direction bypassing the convex portion decreases, there is an opportunity for the bubbles to rise by that amount, and the bubbles tend to rise so that bubbles can be removed as a result.

Moreover, the 2nd convex part 4r shown to FIG. 11 (F) has the effect | action which detours the flow of molten glass G in the middle of the flow path R2, and suppresses sinking of a bubble. Therefore, in addition to the effect of forming the first convex portion 4p, it is possible to promote the rise of bubbles and to prevent the bubbles from sinking. For this reason, you may employ | adopt the structure which provided the 2nd convex part 4r in arbitrary positions in the middle of the flow path R2 separately from the 1st convex part 4j-4p.

As mentioned above, about the said 1st convex part 4j-4r, in the 2nd clarification tank 4, it prevents the sinking of the bubble of the both ends of the width direction of the flow path R2 effectively, and bypasses a flow. It is preferable that the downstream wall side of the bottom wall part 4a is formed so that the side wall part 4b may be contacted at least on the width direction both ends of the bottom wall part 4a so that a flow velocity may fall. Therefore, like the 1st convex part 4n shown to FIG. 11 (E), you may form a convex part in the full width of the bottom wall part 4a, and although not shown, FIG. 11 (A)-FIG. 11 (D) May be intermittently formed in the width direction of the bottom wall part 4a of the downstream end side of the 2nd clarification tank 4 of the 1st convex part 4j-4m of the shape shown to the following.

12 is an inner surface cover applied to a clarification tank according to the present invention, wherein the upper end of the Mo side wall plate 21 in the cover assembly is arranged to protrude upward from the liquid level position GH of the molten glass G. It is sectional drawing which shows an example structure in one case.

When the side wall plate 21 made of Mo is arranged to protrude upward from the liquid surface position GH of the molten glass G as in this embodiment, the cross-section inverted U-shape is formed so that the side wall plate 21 does not come into contact with air. The upper end of the side wall plate 21 is covered by the outer first cover piece 51 and the inner second cover piece 52.

The outer first cover piece 51 is made of a heat-resistant metal material such as Pt alloy such as Pt or PtRh, iridium, and the inner second cover piece 52 is heat-resistant such as alumina (Al ₂ O ₃ ) or zirconia. Made of ceramics.

The outer 1st cover piece 51 is hard to receive the erosion of the molten glass G, and is a heat-resistant metal which does not have a problem even if it contacts air, The 2nd cover piece 52 made of heat-resistant ceramics has a clarification tank 4 In the case where the silica coat layer is formed in the cover assembly 16 when the molten glass G is first flowed after the construction of the structure, Pt is damaged when the silica coat layer is in contact with Pt, so that the damage is prevented. . In addition, from this viewpoint, the position of the lower edge part 51a of the outer side 1st cover piece 51 is formed so that it may be located above the lower end 52a of the inner side 2nd cover piece 52, and the 1st cover piece It is preferable that the lower end portion 51a of the 51 is spaced apart from the surface of the side wall plate 21 by about 10 mm.

By employ | adopting the structure shown in FIG. 12, the upper end position of the side wall plates 21 and 26 made of Mo can be arrange | positioned above the liquid level position GH of the molten glass G. FIG. According to this structure, the side wall part 4b which comprises the flow path R2 can be covered by the inner surface cover 15 with a wider range. Thereby, since the 1st side wall plate 21 can be arrange | positioned to the upper direction of the liquid level position GH of the molten glass G, the molten glass G is refractory in the vicinity of the liquid level GH of the molten glass G. A structure that does not directly contact the brick 4f can be realized. Moreover, the glass manufacturing apparatus 1 is operated so that the liquid level position GH of the molten glass G may fluctuate up and down, and even if the clarification tank 4 is used, the side wall plates 21 and 26 are hard to be damaged. Can provide. That is, even if the height degree of the 1st cover piece 51 and the liquid surface position GH of the molten glass G fluctuate, since the side wall plates 21 and 26 do not contact air, the side wall plate 21 And 26) are Mo agents, and there is no problem even if the liquid level GH fluctuates.

Moreover, since elution of the impurity on the refractory bricks 4e and 4f can be prevented with respect to the molten glass G in the vicinity of the liquid level position GH, it is an impurity with respect to the molten glass G near the liquid level position GH. There is no mixing.

FIG. 13 shows an example in which the cover portions 16 according to the present invention are provided with the teeth 20c and 25c also at the end sides of the first bottom wall plate 20 and the second bottom wall plate 25. The other structure is the same as that of the first embodiment.

Like the structure of this embodiment, the tooth part 20c is formed in the downward direction at the end side of the 1st bottom wall plate 20, and the tooth part 25c is formed downward in the end side of the 2nd bottom wall plate 25, The first bottom wall plate 20 and the second bottom wall plate 25 provide the clarification tank 4 by inserting all of them into the wood part or the slit 4s of the firebrick 4c which comprises the bottom wall part 4a. It is provided on the bottom wall part 4a of the.

In the structure of this example, since the back parts 20c and 25c are formed in the end side of the 1st bottom wall plate 20 and the 2nd bottom wall plate 25, the 1st bottom wall plate 20 and the 2nd bottom wall plate 25 ) And flows through the gap region between the bottom wall portion 4a of the flow path R2 and the molten glass G tries to flow along the flow path R2. The flow of the molten glass G which is going to flow downstream of (R2) can be prevented.

By forming the teeth portions 20c and 25c on the end sides of the first bottom wall plate 20 and the second bottom wall plate 25, the contaminated molten glass G can be prevented from flowing downstream of the clarification tank 4. .

Therefore, according to the structure of this example, of course, the contaminated molten glass G of the gap part of the side wall part 4b and the cover assembly 16 does not flow downstream, similarly to the structure of 1st Embodiment, The contaminated molten glass G in the gap portion of the bottom wall portion 4a and the cover assembly 16 can also provide a structure that does not flow downstream.

Fig. 14 shows an example of the cover assembly 16A applied to the inner cover 15A according to the present invention. In this example, the structure differs from the structure of the first embodiment described above in the first embodiment. The first bottom wall plate 20 and the second bottom wall plate 25 which have been separated from each other are integrated into one bottom wall plate 60. Moreover, the 1st plate assembly 17 and the 2nd plate assembly 18 isolate | separated in 1st Embodiment mentioned above are integrated, and it is common to one plate assembly 61. As shown in FIG. In addition, the 3rd cover plates 22A and 22B which were separated in 1st Embodiment were integrated, the cross-sectional shape is shared by the U-shaped cover plate 62, and the 4th cover plate 24 is abbreviate | omitted. It is. The cover plate 62 is formed in a U shape consisting of a bottom plate 62a and side plates 62b on both sides.

In the structure of this example, the bottom plate 62a of the cover plate 62 is half the width of the bottom edge plate 60 of the bottom wall plate 60, and the other half of the width is projected so as to cover the bottom plate 62a by means of fasteners such as rivets (not shown). The cover plate 62 is fixed to the edge portion of 16A). In addition, one side plate 62b of the cover plate 62 is half the width of the first side wall plate 21, the other half of the width is projected out, and the other side plate 62b is the second side wall plate 26. The cover plate 62 is fixed to the end edge of the cover half by protruding the other half of the width, and the cover plate 62 is fixed to the end edge of the cover assembly 16A by a fixture such as a rivet (not shown). Moreover, the side wall plates 21 and 26 are formed with respect to the bottom wall plate 60 by folding | folding with respect to the board | plate material of a heat resistant metal sheet.

Also by the inner surface cover 15A of this example, the bottom wall part 4a and the side wall parts 4b and 4b of the flow path R2 can be protected from the molten glass G. FIG. And the absorption effect of the thermal expansion component when the cover assembly 16A, 16A expands in the longitudinal direction of the flow path R2 can be acquired similarly to the structure of 1st Embodiment. That is, the flow path (using the gap between the bottom wall plates 60 and 60 adjacent to the flow direction of the flow path R2 and the gap between the side wall plates 21 and 21 and the gap between the side wall plates 26 and 26 are used. The absorption effect of the thermal expansion component when the cover assemblies 16A and 16A thermally expands in the longitudinal direction of R2) can be obtained.

Moreover, since the inner surface cover 15A of this example shared the 1st plate assembly 17 and the 2nd plate assembly 18 which were adjacent to the width direction of the flow path R2, it covers in the width direction of the flow path R2. The absorption effect when the assembly 16A is expanded is not obtained, but the side wall plates 21 and 26 are arranged not to be in close contact with the side wall portions 4b of the flow path R2 but are disposed with a slight gap, so that the flow path ( The structure shown in FIG. 14 is applicable when it is set as the structure which does not need to consider thermal expansion content in the width direction of R2).

For example, as shown in FIG. 6, when supporting the side wall plate 26 with the bolt-shaped fixture (support) 35 made of heat-resistant metal, such as Mo, through the fire brick 4e, the side wall plate 26 Since it is easy to provide a gap between the and the refractory bricks 4e and 4f, this gap can be used for absorption of thermal expansion. In addition, in that case, it is not necessary to firmly fix the fastener 35 to the side wall plate 26, and it is preferable to engage the side wall plate 26 so that it can move somewhat in the axial direction of the fastener 35. Of course, if the back part 26a of the side wall plate 26 is supported by the wood part 4B of the firebrick 4e, there will be no problem also about the structural strength of the side wall plate 26.

It is a block diagram which shows an example of the manufacturing apparatus of the glassware provided with the clarification tank which concerns on 3rd Embodiment of this invention.

The manufacturing apparatus 80 of the glassware of this embodiment is equipped with the glass melting furnace 90 which has the melting tank 2 and the clarification tank 97. As shown in FIG. The clarification tank 97 in the glass melting furnace 90 has a structure substantially equal to the clarification tank 7 of the first embodiment.

In the clarification tank 97 of this embodiment, it replaces the electrode 8 as a heating means provided in the 1st clarification tank 3 with respect to the clarification tank 7 of 1st Embodiment, The 1st blue The point which arrange | positioned two or more lateral oxygen combustion burners 91 in the side wall part 3b of the sign 3 is different. In this case, the refractory metal metal plate which covers the refractory brick by the side of a flow path can be provided with respect to the refractory brick flow path. The installation of the inner surface cover, which is this metal plate, is as described above.

In the 1st clarification tank 3, in order to make the temperature of the molten glass G into the temperature at which a clarification effect is obtained, the some combustion flame 92 is provided by installing several oxygen combustion burners 91 instead of the electrode 8. It produces and heats molten glass G to the target temperature by those radiant heat.

In order to generate convection of the molten glass G in the 1st clarification tank 3, you may have a structure which provided two or more electrodes 8 separately from the oxygen combustion burner 91. As shown in FIG.

Also in the glass melting furnace 90 of 3rd Embodiment, the bubble removal of two stages is carried out by the 1st clarification tank 3 and the 2nd clarification tank 4 similarly to the clarification tank 7 of 1st Embodiment mentioned above. The molten glass G with few bubbles can be transferred to the shaping | molding apparatus 6, and a glass product can be manufactured.

Although this invention is not specifically limited about a melting tank, The air melting method which blows the mixed powder raw material which mixes glass raw material powder in a predetermined ratio directly from a burner, and makes it molten glass in a hot gaseous-phase atmosphere (for example, as a reference document) For example, you may melt a molten glass by the melting tank of Unexamined-Japanese-Patent No. 2006-199549.

According to the air melting method, since the glass raw material powder is melted in a gaseous atmosphere, the amount of water in the molten glass is increased compared to the melting by electric melting or a conventional burner, and the clarification effect at a high temperature of the present invention can be enhanced. Because.

In addition, although the amount of moisture in a molten glass changes with the difference in glass composition and the manufacturing method of a glass raw material particle by the in-air melting method, when the absorbance with respect to the light of wavelength 2.75-2.95 micrometers is measured by infrared spectroscopy single-band method, It turns out that it becomes at least 600 ppm or more. This water content is 400-600 ppm in the case of electrofusion, but it turns out that it is clearly high compared with 300 ppm in the case of melting in a normal burner. The upper limit of the amount of water in the molten glass is, for example, about 20000 ppm as a range capable of functioning as the number of bonding water. As for the moisture content for further improving the clarification effect of this invention, 900 ppm or more is more preferable.

In the present invention, the amount of water in the glass was determined by the infrared spectroscopy single band method. However, in the β-OH value obtained by dividing the maximum value βmax of the absorbance by the thickness (mm) of the sample, 0.33 mm ⁻¹ at 600 ppm. In the case of 300 ppm, it becomes about 0.165 mm <^-1> .

Industrial availability

The technique of the present invention can be widely applied to the production of architectural glass, vehicle glass, optical glass, medical glass, glass for display devices, cover glass for photovoltaic power generation or solar power generation, and other general glass products.

In addition, all the content of the JP Patent application 2010-293999, the claim, drawing, and the abstract for which it applied on December 28, 2010 is referred here, and it takes in as an indication of this invention.

R1, R2, R3: Euro
G: molten glass
GH: liquid level position of molten glass
1: manufacturing apparatus
2: melting tank
3: first clarification
3a: 1st bottom wall part
3b: first side wall portion
3d: entrance end (first end)
3e: drain out
3f: inlet
3h: outlet
3i: drain out
4: second clarification
4a: 2nd bottom wall part
4b: second side wall portion
4d, 4e, 4f: firebrick (refractory)
4g: inlet end (second end)
4h: inlet
4i: outlet
4j, 4k, 4l, 4m, 4n, 4p: first convex portion
4r: second convex portion
4s: slit
5: cooling tank
5a: 3rd bottom wall part
5b: third side wall portion
5e: Inlet
5f: outlet
6: forming device
7, 57, 97: clarification
8: electrode
14, 56, 90: glass melting furnace
15: inner cover
16: cover assembly
17: first plate assembly
18: second plate assembly
20: first bottom wall plate
20c: this part
21: first side wall plate
21a: This part
22: first cover plate
22A, 22B: Third Cover Plate
23: second cover plate
24: fourth cover plate
25: second bottom wall plate
25c: this part
26: second side wall plate
26a: this part
30, 31, 32: rivet
S1: Glass melting process
S2: Clarification Process
S3: forming process
S4: slow cooling process
S5: Cutting Process
G6: Glass Products
51: first cover
52: second cover piece
15A: inner cover
16A: Cover Assembly
60: bottom wall plate
62: cover plate
91: Oxygen Combustion Burner

Claims (20)

The flow path of the 1st molten glass partitioned by the 1st bottom wall part and the 1st side wall part of the both sides, the drain out part provided in the bottom wall part of the downstream side of the flow path of this 1st molten glass, and the heating means of a molten glass And a first clarification tank having a length of the flow path of the first molten glass larger than the height of the first side wall portion;
A second having a flow path shape provided after the first clarification tank and having a flow path of the second molten glass partitioned by the second bottom wall part and the second side wall parts on both sides thereof, wherein the molten glass is in a uniflow state; Clarification,
A clarification tank provided with the cooling tank provided after the said 2nd clarification tank, and provided with the flow path of the 3rd molten glass divided by the 3rd bottom wall part and the 3rd side wall part of the both sides. The method of claim 1,
The clarification tank whose width | variety orthogonal to the flow direction of a 2nd bottom wall part is larger than the height of a 2nd side wall part in the flow path of a said 2nd molten glass. 3. The method according to claim 1 or 2,
The flow path shape of the second molten glass is Gr / Re ² when the glass hop number of the molten glass flowing through the flow path is Gr and the Reynolds number is Re. A clarification tank set to satisfy <11420. The method according to any one of claims 1 to 3,
The heating means of a said 1st clarification tank is a some electrode, and in the said 2nd clarification tank, the 2nd molten glass flow path in a said 2nd bottom wall part and a 2nd both side wall part is a refractory brick material, The flow path side A clarification tank with an inner surface cover of a heat-resistant metal covering a fire brick of the. The method according to any one of claims 1 to 3,
The heating means of a said 1st clarification tank is a burner, and in the said 1st and 2nd clarification tanks, the molten glass flow path in the said bottom wall part and both side wall parts is made of a refractory brick, and covers the fire brick of the flow path side. Clarification tank with inner cover made of heat-resistant metal. 6. The method according to any one of claims 1 to 5,
The clarification tank whose flow volume which flows through the flow path of 10-15 m of lengths of the said 1st molten glass, the length of the flow path of said 2nd molten glass of 4-14 m, and molten glass is 100-1000 ton / day. 7. The method according to any one of claims 1 to 6,
The clarification tank in which the 1st end part higher than the 1st bottom wall part was formed in the most upstream end of the flow path of a said 1st molten glass. The method according to any one of claims 1 to 7,
The clarification tank in which the 2nd end part higher than the 2nd bottom wall part was formed in the most upstream end of the flow path of a said 2nd molten glass. The method according to any one of claims 1 to 8,
The clarification tank in which the 1st convex part was formed in the corner part of a 2nd side wall part and a 2nd bottom wall part in the downstream of the flow path of a said 2nd molten glass. The method of claim 9,
The clarification tank in which the 2nd convex part was formed by the corner part of the 2nd side wall part and the 2nd bottom wall part further upstream from the formation position of the said 1st convex part in the flow path of the said 2nd molten glass. The method according to claim 4 or 5,
The inner surface cover comprises a plurality of cover assemblies which cover the molten glass flow path side of the bottom wall portion and the side wall portion and are disposed along the flow direction of the molten glass, and the cover assembly includes a bottom wall plate covering the bottom wall portion, and the side wall. A clarification tank having a side wall plate covering a portion and a first cover plate covering an abutting area of cover assemblies arranged along the flow path. 12. The method according to any one of claims 1 to 11,
The clarification tank provided with the inner surface cover of the heat-resistant metal which covers the said molten glass flow path side in the said 3rd bottom wall part and both 3rd side wall parts in the said cooling tank. 13. The method according to any one of claims 1 to 12,
The heating means provided in the first clarification tank is composed of a plurality of electrodes erected in the first clarification tank, these electrodes are arranged longitudinally and horizontally at predetermined intervals so as to form a matrix along the flow direction of the molten glass, and the melting A clarification tank in which a plurality of electrodes lined up in a line along the flow path of glass is a multiphase AC electrode. The glass melting furnace which has the clarification tank as described in any one of Claims 1-13, and provided with the melting tank in the upstream of the flow direction of the molten glass of the said clarification tank. Using the glass melting furnace according to claim 14 to melt the glass raw material with a melting tank;
Heating and clarifying the molten glass from the melting tank in a first clarification tank and discharging foreign matters generated in the first clarification tank from a bottom portion downstream of the first clarification tank;
A process of clarifying the flow of the molten glass of the second clarification tank in a uniflow state, and
The manufacturing method of the molten glass containing the process of cooling the molten glass derived from the 2nd clarification tank by a cooling tank. The method of claim 15,
If the above uniflow state is Grösh of the molten glass, and Reynolds is Re, Gr / Re ² The manufacturing method of the molten glass obtained by setting the flow velocity of a molten glass, the temperature change of the molten glass in the inlet and outlet of the flow path of a molten glass, and the depth of a molten glass so that <11420 may be satisfied. 17. The method according to claim 15 or 16,
The manufacturing method of the molten glass which does not heat the molten glass of a said 2nd clarification tank. 18. The method according to any one of claims 15 to 17,
The heating in the first clarification tank is performed such that the temperature at the downstream end side of the first clarification tank is higher than the temperature at the upstream end side of the first clarification tank with respect to the temperature of the molten glass flowing through the first clarification tank. Method of making glass. After the process of manufacturing the molten glass of any one of Claims 15-18, the molten glass is cooled to the glass forming temperature area | region, the process of shape | molding a molten glass, and the process of cooling the glass after shaping | molding Method for producing a glass article comprising. The manufacturing apparatus of the glass goods provided with the glass melting furnace of Claim 14, the shaping | molding means which shape | molds the molten glass manufactured by this glass melting furnace, and the slow cooling means which cools the glass after shaping | molding.

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