WO2010098328A1 - Device for stirring molten glass - Google Patents

Device for stirring molten glass Download PDF

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Publication number
WO2010098328A1
WO2010098328A1 PCT/JP2010/052790 JP2010052790W WO2010098328A1 WO 2010098328 A1 WO2010098328 A1 WO 2010098328A1 JP 2010052790 W JP2010052790 W JP 2010052790W WO 2010098328 A1 WO2010098328 A1 WO 2010098328A1
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WO
WIPO (PCT)
Prior art keywords
glass
molten glass
stirring
molten
stirring blade
Prior art date
Application number
PCT/JP2010/052790
Other languages
French (fr)
Japanese (ja)
Inventor
悠介 鈴木
元之 広瀬
兼士 山田
Original Assignee
旭硝子株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 旭硝子株式会社 filed Critical 旭硝子株式会社
Priority to CN201080006093.9A priority Critical patent/CN102300819B/en
Priority to JP2011501606A priority patent/JP5510446B2/en
Publication of WO2010098328A1 publication Critical patent/WO2010098328A1/en

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/18—Stirring devices; Homogenisation
    • C03B5/187—Stirring devices; Homogenisation with moving elements
    • C03B5/1875—Stirring devices; Homogenisation with moving elements of the screw or pump-action type
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/18—Stirring devices; Homogenisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0723—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis oblique with respect to the rotating axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0724—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis directly mounted on the rotating axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1124—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades rake-shaped or grid-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
    • B01F27/1132—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller with guiding tubes or tubular segments fixed to and surrounding the tips of the propeller blades, e.g. for supplementary mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/50—Pipe mixers, i.e. mixers wherein the materials to be mixed flow continuously through pipes, e.g. column mixers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0431—Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the present invention stirs molten glass in a molten glass conveying tube for conveying molten glass, particularly in a molten glass conveying tube having a high molten glass conveying amount, such as a plate glass manufacturing apparatus for a large flat panel display (FPD).
  • the present invention relates to a molten glass stirring device.
  • a stirring device is attached to a molten glass conveying tube for conveying the molten glass to stir the molten glass.
  • the homogeneity of the molten glass greatly affects the transparency and thickness of the produced glass.
  • the stirrer is generally composed of a stirrer having a central axis serving as a center of rotation and a stirring blade attached around the central axis.
  • Patent Document 1 a plurality of convex portions are arranged on the outermost side of the stirring blade for narrowing the interval between the wall surface and the stirring blade for the purpose of reducing molten glass that passes through the wall surface of the flow path without stirring.
  • a stirrer has been proposed. However, this stirrer is still poor in prevention of slipping near the wall surface of the flow path, and slipping easily occurs around the central axis of the stirrer, so that the stirring effect of the molten glass cannot be said to be sufficient.
  • the stirrer disclosed in Patent Document 2 has a long stirring blade and a short stirring blade with different rotation radii as the stirring blades attached around the central axis for the purpose of improving the homogeneity of the molten glass. And mounting two or more short stirring blades alternately.
  • this stirring device it cannot be said that the effect of preventing slipping around the wall surface of the flow path or around the central axis of the stirring device is sufficient.
  • a means for stirring the molten glass for the purpose of improving the homogeneity there is also a molten glass stirring blade described in Patent Document 3 described later.
  • Japanese Unexamined Patent Publication No. 2001-72426 Japanese Unexamined Patent Publication No. 2003-63829 Japanese Unexamined Patent Publication No. 10-265226
  • glass substrates for large FPDs in particular have not been mixed with unmelted raw materials, are required to have high transparency and high flatness, and high uniformity glass with few defects has been demanded.
  • high homogeneity is also required for glass for applications requiring high transparency such as optical lenses, optical communication fibers, optical filters, solar cell substrates, and fluorescent tubes.
  • the present invention prevents the molten glass from slipping through the stirring device, more specifically, preventing the molten glass from slipping through the vicinity of the wall surface of the conveying tube and around the central axis of the stirring device.
  • An object of the present invention is to provide a glass stirrer that can be used and that is excellent in the stirring action of molten glass in a molten glass conveying tube.
  • the present invention achieves the above-mentioned purpose by providing a molten glass having a viscosity of 100 to 7000 dPa ⁇ s in a molten glass conveying tube that conveys the molten glass at a conveying amount of 1 to 50 m 3 / hour ⁇ S (S is a sectional area of the conveying tube).
  • a molten glass agitating device for agitating molten glass comprising a rotatable central axis and an agitating portion provided on the central axis, each agitating portion being a plate-like body
  • the horizontal agitating blade is provided with a long side perpendicular to the central axis and a short side inclined by 10 to 70 degrees in the axial direction of the central axis.
  • the vertical agitating blade is provided at a position where the long side is parallel to the central axis and defines the outer edge of the agitating part, and the diameter of the molten glass conveyance tube at the site where the agitating part is installed is D 1 ( mm), the maximum diameter of the outer edge of the agitating portion D 2 and (mm) Rutoki provides molten glass stirring device satisfying 0.8 ⁇ D 1 ⁇ D 2 ⁇ 0.98 ⁇ D 1.
  • the present invention also relates to a glass melting apparatus, a sheet glass forming apparatus, and a sheet glass manufacturing apparatus having a molten glass conveying tube provided between the glass melting apparatus and the sheet glass forming apparatus, the molten glass conveying tube.
  • a plate glass manufacturing apparatus provided with at least one molten glass stirring device of the present invention described above is provided.
  • the present invention also provides a molten glass stirring method using the molten glass stirring device of the present invention.
  • this invention provides the plate glass manufacturing method using the plate glass manufacturing apparatus of this invention.
  • the glass stirrer of the present invention can prevent the molten glass from slipping through the stirrer, more specifically, the molten glass can be prevented from slipping near the wall surface of the molten glass transport tube and around the central axis of the stirrer,
  • the molten glass is excellent in the stirring action of the molten glass in the molten glass conveying tube, and is excellent in the homogeneity of the molten glass after stirring, so that it is particularly suitable for a large FPD glass substrate (for example, one side of 2 m or more). Glass with high homogeneity can be obtained. As a result, there is no mixture of unmelted raw materials, and glass with high transparency and high flatness can be obtained.
  • the glass stirring device of the present invention is excellent in the homogeneity of the molten glass after stirring, high transparency such as optical lenses, optical communication fibers, optical filters, solar cell substrates, fluorescent tubes is required. It is also suitable as a molten glass stirrer for a glass production apparatus for the intended use.
  • FIG. 1 is a schematic diagram of a molten glass conveyance tube used in Example 1.
  • FIG. 1 The side view of the glass stirring apparatus of the comparative example 1.
  • FIG. 2 The perspective view of the glass stirring apparatus of the comparative example 2.
  • FIG. 3 is a schematic diagram illustrating the behavior of a fluid in a molten glass conveyance tube in the first embodiment.
  • the size of glass substrates for FPD has been increasing year by year, and the demand for such glass substrates has been increasingly demanded due to an increase in demand.
  • facilities for manufacturing plate glass for FPD an increase in the transport amount of molten glass is required.
  • facilities for producing glass for applications such as optical lenses, optical communication fibers, optical filters, solar cell substrates, and fluorescent tubes, an increase in the transport amount of molten glass is also required.
  • the glass stirrer of the present invention is preferably used by being installed in such a molten glass conveyance tube having a high conveyance amount of molten glass.
  • the viscosity is 100 to 7000 dPa ⁇ s, preferably the viscosity is 200 to 6000 dPa. ⁇
  • FIG. 1 is a perspective view showing a part of the glass stirring device of the present invention
  • FIG. 2 is a plan view of the glass stirring device
  • FIG. 3 is a side view of the glass stirring device.
  • the glass stirring device 1 shown in FIGS. 1 to 3 has a rotatable central shaft 10, and a stirring portion 20 is provided at the lower end of the central shaft 10.
  • the stirring unit 20 includes a vertical stirring blade 30 and a horizontal stirring blade 40 each made of a plate-like body.
  • the longitudinal stirring blade 30 made of a plate-like body is provided at a position where the long side is parallel to the central axis 10 and defines the outer edge of the stirring unit 20.
  • the horizontal stirring blade 40 is positioned between the parallel central shaft 10 and the vertical stirring blade 30.
  • the vertical stirring blade 30 mainly has a function of preventing the molten glass from slipping near the wall surface of the molten glass conveying tube and stirring the molten glass.
  • the vertical stirring blade 30 preferably has support structures 30 a and 30 b extending from the upper and lower ends in the direction of the central axis 10 in terms of the support strength of the vertical stirring blade 30. Therefore, when the support strength of the vertical stirring blade is obtained, the support structures 30a and 30b may be omitted. In this case, the vertical stirring blade 30 is indirectly supported by the central shaft 10 via the horizontal stirring blade 40. However, it is preferable to have at least one of the support structures 30a and 30b.
  • the support structures 30a and 30b are provided in portions other than the upper and lower ends of the vertical stirring blade 30 (such as an intermediate portion of the vertical stirring blade 30) (support structures corresponding to 30a and 30b are provided in the intermediate portion of the vertical stirring blade 30). However, in consideration of the stirring function of the molten glass, it is preferably provided at the upper and lower ends of the vertical stirring blade 30.
  • the glass stirring device 1 shown in FIGS. 1 to 3 has four vertical stirring blades 30, but the number of vertical stirring blades in the glass stirring device 1 of the present invention is not limited to this.
  • the number of longitudinal stirring blades is preferably 2 to 8, more preferably 3 to 6.
  • the dimension of the vertical stirring blade 30 is appropriately selected according to the dimension of the molten glass transport pipe in which the glass stirring device is installed, the viscosity of the molten glass being transported, and the transport amount.
  • the maximum diameter D 2 of the outer edge of the stirring unit 20 determined by the installation position of the vertical stirring blade 30 is expressed by the following formula (1) in relation to the diameter D 1 of the transport pipe 100 at the site where the glass stirring device 1 is installed. It is necessary to satisfy.
  • the length L of the long side of the vertical stirring blade 30 is transported by the relationship with the maximum diameter D 2 of the outer edge of the stirring unit 20 or the length of the portion where the glass stirring device 1 can be installed in the molten glass transport tube 100. It is suitably selected according to the viscosity or the transport amount of the molten glass. Note that when viewed in relation to the maximum diameter D 2 of the outer edge of the stirring unit 20, the length L of the long side of the vertical stirring blade 30 satisfies 0.5 ⁇ D 2 ⁇ L ⁇ 3 ⁇ D 2. Preferably, D 2 ⁇ L ⁇ 2.5 ⁇ D 2 is satisfied, and 1.2 ⁇ D 2 ⁇ L ⁇ 2 ⁇ D 2 is more preferable.
  • the width W of the short side of the vertical stirring blade 30 is the size of the other components of the glass stirring device 1, specifically, the maximum diameter D 2 of the outer edge of the stirring unit 20, the diameter D 3 of the central shaft 10, or the horizontal It is appropriately selected according to the relationship with the length of the stirring blade 40, the viscosity of the molten glass being conveyed, and the conveyance amount.
  • the width W of the short side of the vertical stirring blade 30 satisfies 0.01 ⁇ D 2 ⁇ W ⁇ 0.2 ⁇ D 2. Is more preferable, 0.05 ⁇ D 2 ⁇ W ⁇ 0.15 ⁇ D 2 is more preferable, and 0.07 ⁇ D 2 ⁇ W ⁇ 0.15 ⁇ D 2 is more preferable.
  • the width of the outer end face and the inner end face of the vertical stirring blade 30 is defined as the thickness t of the vertical stirring blade 30.
  • the thickness t of the vertical stirring blade 30, the relationship and the maximum diameter D 2 of the outer edge of the agitating portion 20, other dimensions of the vertical stirring blade 30, specifically, the length L and width W of the vertical stirring blade 30 Ya Depending on the constituent material of the vertical stirring blade 30, the viscosity of the molten glass to be transported and the transport amount are appropriately selected.
  • the thickness t of the vertical stirring blade 30 preferably satisfies 0.01 ⁇ D 2 ⁇ t ⁇ 0.3 ⁇ D 2 , It is more preferable that 0.03 ⁇ D 2 ⁇ t ⁇ 0.2 ⁇ D 2 is satisfied, and it is more preferable that 0.05 ⁇ D 2 ⁇ t ⁇ 0.15 ⁇ D 2 is satisfied.
  • the constituent material of the vertical stirring blade 30 is not particularly limited as long as it is a material having heat resistance and erosion resistance to molten glass, and it is preferable to use platinum or a platinum rhodium alloy having excellent heat resistance. .
  • the horizontal stirring blade 40 made of a plate-like body is located between the central shaft 10 and the vertical stirring blade 30.
  • the horizontal stirring blade 40 has a long side orthogonal to the central axis 10 and a short side inclined with respect to the axial direction of the central axis 10.
  • the side orthogonal to the central axis 10 is the long side
  • the side orthogonal to the long side is the short side. Therefore, depending on the shape of the horizontal stirring blade, the apparent long side-short side relationship and the long side-short side relationship in the present invention may be reversed.
  • the horizontal stirring blade 40 has a function of preventing the slippage on the side of the central shaft 10 relative to the vertical stirring blade 30, particularly around the central shaft 10, and increasing the residence time of the molten glass passing through the portion where the stirring unit 20 is provided.
  • shaft 10 side rather than the vertical stirring blade 30 improves.
  • the inclination angle ⁇ of the horizontal stirring blade 40 with respect to the central axis 10 is 10 to 70 degrees, preferably 30 to 60 degrees, and more preferably 40 to 50 degrees.
  • the number of horizontal stirring blades provided between the central shaft 10 and the vertical stirring blades 30 is not limited to this.
  • one horizontal stirring blade 40 is provided between the central shaft 10 and the vertical stirring blades 30.
  • five or more horizontal stirring blades 40 may be provided.
  • the number of horizontal stirring blades provided between the central shaft 10 and the vertical stirring blades 30 is preferably 1 to 8.
  • the distance between the horizontal stirring blades 40 provided between the central shaft 10 and the vertical stirring blades 30 should not be too narrow in terms of preventing an increase in the torque required to rotate the stirring unit 20. There is a need.
  • the side surface shape of the stirring unit 20 shown in FIG. 3 there is a space portion (that is, the horizontal stirring blade 40 exists) in the region surrounded by the central shaft 10, the vertical stirring blade 30, and the support structures 30 a and 30 b. If the ratio of the portion not to be used is reduced, the torque required to rotate the stirring unit 20 increases, which is not preferable.
  • the area of the region surrounded by the central shaft 10, the vertical stirring blade 30, and the support structures 30a and 30b that is, the horizontal stirring blade 40 exists.
  • the ratio ((S 1 / (S 1 + S 2 )))) is preferably 80% or less, more preferably 60% or less, and further preferably 20 to 60%.
  • the length i of the horizontal stirring blade 40 is the size of the other components of the glass stirring device 1, specifically, the maximum diameter D 2 of the outer edge of the stirring unit 20, the diameter D 3 of the central shaft 10, and the vertical stirring blade 30. It is appropriately selected according to the relationship with the width W.
  • the height h of the horizontal stirring blade 40 is appropriately determined according to the relationship (S 1 / (S 1 + S 2 )) described above, the inclination angle ⁇ of the horizontal stirring blade 40, the viscosity of the molten glass being transported, and the transport amount. Selected.
  • the thickness of the horizontal agitating blade 40 depends on other dimensions of the horizontal agitating blade 40, specifically, the length i and the height h of the horizontal agitating blade 40, the constituent material of the horizontal agitating blade 40, and the molten glass to be conveyed. It is appropriately selected according to the viscosity and the conveyance amount.
  • the constituent material of the horizontal stirring blade 40 when the constituent material of the horizontal stirring blade 40 is the above-described material, it is preferable that 0.005 ⁇ i ⁇ thickness ⁇ 0.4 ⁇ i. More preferably, 0.01 ⁇ i ⁇ thickness ⁇ 0.2 ⁇ i, and even more preferably 0.015 ⁇ i ⁇ thickness ⁇ 0.1 ⁇ i.
  • the torque required to rotate the stirring unit 20 increases as the diameter of the central shaft 10 increases. Further, when the diameter of the central shaft 10 is increased, a region surrounded by the central shaft 10, the vertical stirring blade 30 and the support structures 30a and 30b in FIG. 3 is narrowed. In this region, the molten glass passing through the central axis 10 side from the vertical stirring blade 30 is stirred. Therefore, if this region is too narrow, the function of stirring the molten glass by the horizontal stirring blade 40 is lowered, which is not preferable. For the above reason, the maximum diameter D 2 (mm) of the outer edge of the stirring unit 20 and the diameter of the central shaft 10 (more specifically, the diameter of the central shaft 10 near the lower end portion constituting the glass stirring unit 20).
  • D 3 (mm) is preferably D 3 ⁇ 0.6 ⁇ D 2 , more preferably D 3 ⁇ 0.5 ⁇ D 2 , and D 3 ⁇ 0.45 ⁇ D 2 . More preferably.
  • the central shaft 10 may be damaged by stress during turning. From this viewpoint, when the constituent material of the central shaft 10 is the material described above, the maximum diameter D 2 (mm) of the outer edge of the stirring unit 20 and the diameter of the central shaft 10 (more specifically, of the central shaft 10, It is preferable that D 3 ⁇ 0.1 ⁇ D 2 satisfies the diameter D 3 near the lower end constituting the glass stirring unit 20.
  • Patent Document 3 includes a rotary shaft 9, first flat plates 3 and 4, third flat plates 7 and 8, and second flat plates 5 and 6 that are inclined at an angle ⁇ 2 with respect to the axial direction of the rotary shaft 9.
  • a molten glass stirring blade 1 is disclosed (see FIG. 6 of the present application).
  • the molten glass stirring blade of the same document is intended for stirring in a small-scale continuous furnace, and stirs the molten glass having a small flow rate, that is, held in the melting tank for a certain period of time.
  • the reason why the second flat plates 5 and 6 are inclined at an angle ⁇ 2 with respect to the axial direction of the rotating shaft 9 is to push up the molten glass held in the melting tank to the upper side of the melting tank. .
  • the glass stirrer of the present invention is installed in a molten glass conveyance tube that conveys molten glass having a viscosity of 100 to 7000 dPa ⁇ s at a conveyance amount of 1 to 50 m 3 / hour ⁇ S (S is a cross-sectional area of the conveyance tube). Since it is used, the vertical stirring blade prevents the molten glass from slipping through in the vicinity of the wall surface of the conveying tube and stirs the molten glass in the vicinity of the wall surface of the molten glass conveying tube. Therefore, the molten glass should not be pushed upward as in the second flat plates 5 and 6 disclosed in Patent Document 3.
  • the outer edge position of the stirring section is preferably about 2/3 of the inner diameter of the dissolution tank. . If the width dimension I is larger than the above preferred range, the second flat plates 5 and 6 provided to be inclined with respect to the axial direction of the rotary shaft 9 may come into contact with the inner wall of the dissolution tank.
  • the glass stirring device 1 of the present invention is installed in the molten glass transport tube through which the molten glass is transported, and the molten glass in the molten glass transport tube is stirred.
  • the application target of the present invention is not particularly limited, but for a molten glass conveyance tube that conveys a molten glass having a viscosity of 100 to 7000 dPa ⁇ s at a conveyance amount of 1 to 50 m 3 / hour ⁇ S (S is a cross-sectional area of the conveyance tube). It is preferable to apply.
  • the molten glass stirring method of the present invention has a glass substrate for FPD, an optical lens, an optical communication fiber, an optical filter, a solar cell substrate, and a fluorescent tube.
  • a glass substrate for FPD glass substrate for FPD
  • an optical lens optical communication fiber
  • an optical filter optical filter
  • a solar cell substrate glass substrate for FPD
  • a fluorescent tube it is preferable to apply to the stirring of the molten glass carried out in the process of producing the glass for applications in which the requirement for homogeneity is extremely severe.
  • the stirring conditions of the molten glass are not particularly limited, and the configuration of the glass stirring device to be used (number of vertical stirring blades and horizontal stirring blades, etc.), dimensions of each part of the glass stirring device, glass stirring What is necessary is just to select suitably according to the conditions (the viscosity of a molten glass, the conveyance amount, etc.) regarding the molten glass conveyed in the dimension of the molten glass conveyance pipe which installs an apparatus, and the inside of a molten glass conveyance pipe.
  • the plate glass manufacturing apparatus has, as a minimum configuration, a glass melting apparatus that melts glass raw materials to form molten glass, and a sheet glass forming apparatus that forms molten glass to form sheet glass (for example, a molding apparatus using a float method or a downdraw method). And in order to convey the molten glass obtained with this glass melting apparatus to a sheet glass shaping
  • the sheet glass manufacturing apparatus usually has components other than the glass melting apparatus and the sheet glass forming apparatus. As an example of such other components, there is a vacuum degassing device for refining molten glass.
  • the plate glass manufacturing apparatus has a some molten glass conveyance tube normally.
  • the above-described glass stirring apparatus of the present invention is installed in any one or a plurality of these molten glass transport pipes.
  • the position where the glass stirring apparatus of the present invention is installed is not particularly limited. Therefore, you may install the glass stirring apparatus of this invention in any molten glass conveyance tube which comprises a plate glass manufacturing apparatus.
  • the number of the glass stirring apparatus to install is not specifically limited.
  • the plate glass production apparatus includes a vacuum degassing apparatus as a constituent element
  • at least one of the molten glass conveyance pipe on the upstream side of the vacuum degassing apparatus and the molten glass conveyance pipe on the downstream side of the vacuum defoaming apparatus is installed in the plate glass manufacturing apparatus.
  • the glass stirring device of the invention in producing a highly homogenous plate glass, both in the molten glass conveyance tube on the upstream side of the vacuum degassing device and in the molten glass conveyance tube on the downstream side of the vacuum degassing device. It is more preferable to install the glass stirring device of the present invention.
  • the plate glass manufacturing apparatus of the present invention can be applied to the manufacture of plate glass for various uses, but it is particularly applicable to the manufacture of plate glass for uses where the requirements for homogeneity are extremely severe, such as a glass substrate for FPD. preferable.
  • plate glass production apparatus of the present invention By producing plate glass using the plate glass production apparatus of the present invention, plate glass having no transparency, high transparency, and high flatness can be obtained.
  • FIG. 4 is a schematic diagram of the molten glass conveyance tube used in the model test, and shows a state in which the glass stirring device 1 shown in FIGS. 1 to 3 is disposed in the molten glass conveyance tube (however, schematically As shown, the shape does not necessarily match that of FIG. 3).
  • the fluid moves in the direction of the arrow in the figure.
  • the dimensions of the molten glass conveyance tube shown in FIG. 4 are as follows.
  • Example 1 The behavior of the fluid when the glass stirrer 1 of the present invention shown in FIGS. 1 to 3 was inserted into the conveying tube and stirred was evaluated.
  • the dimensions of each part of the glass stirrer are as follows. Maximum diameter D 2 of the outer edge of the stirring unit 20: 38 mm Diameter of central axis 10 (part constituting stirring unit 20) D 3 : 10 mm Length L of the vertical stirring blade 30: 60 mm Width W of the vertical stirring blade 30: 3.8 mm Thickness t of the vertical stirring blade 30: 3.8 mm Inclination angle ⁇ of the horizontal stirring blade 40 with respect to the central axis 10: 60 ° The length i of the horizontal stirring blade 40 is 10.2 mm.
  • FIG. 8 is a diagram schematically showing the behavior of the fluid during stirring.
  • fluid can be effectively prevented from slipping around the wall surface of the molten glass conveying tube and around the central axis.
  • the fluid simulating the molten glass is cut by the stirring action (reference numeral 100), gradually stretched (reference numeral 200), and flows downstream.
  • FIG. 9 is a diagram schematically showing the behavior of the fluid during stirring. As can be seen from FIG. 9, according to the glass stirring apparatus 1′a of Comparative Example 1, it is possible to prevent fluid from slipping near the wall surface of the transport pipe, but near the center of the transport pipe (around the central axis of the stirring apparatus). The fluid slipped through. As a result, the fluid simulating the molten glass flowed downstream without being cut.
  • Comparative Example 2 A glass stirring apparatus 1′b shown in FIG. 6 was used.
  • the glass stirring apparatus 1′b shown in FIG. 6 has the same shape as the molten glass stirring blade shown in FIG.
  • the dimensions of each part of the glass stirrer 1′b shown in FIG. 6 are as follows.
  • FIG. 10 is a diagram schematically showing the behavior of fluid during stirring. As is clear from FIG.
  • the glass stirring apparatus 1′b of Comparative Example 2 has a stirring action of the fluid near the center of the transport pipe (around the central axis of the stirring apparatus), and the fluid simulating the molten glass is cut. (Reference numeral 100), although it was gradually stretched (reference numeral 200), it was not possible to prevent the fluid from slipping near the wall surface of the transfer pipe.
  • Comparative Example 3 A glass stirring apparatus 1′c shown in FIG. 7 was used.
  • the glass stirring device 1′c shown in FIG. 7 has the same shape as the homogenizing device shown in FIG.
  • the dimensions of each part of the glass stirrer 1′c shown in FIG. 7 are as follows.
  • the long axis of the inclined member 40 ′′ is inclined with respect to the central axis 10 ′, but the short axis is not inclined with respect to the central axis 10 ′.
  • FIG. 11 is a diagram schematically showing the behavior of the fluid during stirring.
  • the glass stirring device 1′c of Comparative Example 3 fluid slipping near the wall surface of the transport pipe is somewhat prevented, but the vicinity of the center of the transport pipe (the central axis of the stirring device) The stirring action of the surrounding fluid was inferior.
  • the fluid simulating the molten glass was cut (reference numeral 100), but flowed downstream without being stretched (reference numeral 300).
  • Example 2 As an example of plate glass production, plate glass is produced using a glass melting device, a first molten glass conveyance tube, a vacuum degassing device, a second molten glass conveyance tube, and a plate glass production device having a float forming device.
  • the first and second molten glass transport pipes are provided with the glass stirring device 1 of the present invention shown in FIGS.
  • a glass raw material is heated and melted with a glass melting apparatus to obtain molten glass.
  • the molten glass passes through the first molten glass conveyance tube, the vacuum degassing device, the second molten glass conveyance tube, and the float forming device in this order and is formed into a sheet glass.
  • the molten glass is stirred by the glass stirrer of the present invention in the process of being transported through the first and second molten glass transport pipes to improve the homogeneity, has no mixture of unmelted raw materials, has high transparency, and is flat. A plate glass with a high degree is obtained.

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Abstract

A molten-glass stirring device by which molten glass having a viscosity of 100-7,000 dPa∙s is stirred in a molten-glass conveyance pipe through which the molten glass is conveyed at a rate of 1-50 m3/hr∙S (wherein S is the sectional area of the conveyance pipe). The molten-glass stirring device is composed of a rotatable center shaft and a stirring part disposed on the center shaft. The stirring part is composed of lateral stirring blades and vertical stirring blades, each blade comprising a platy object. The lateral stirring blades have been disposed so that the longer sides are perpendicular to the center shaft and the shorter sides are inclined toward the axial direction of the center shaft at 10-70 degrees. The vertical stirring blades have been disposed so that the longer sides are parallel to the center shaft and are located in positions that define the periphery of the stirring part. When the diameter of the molten-glass conveyance pipe in the portion where the stirring part has been disposed is expressed by D1 (mm) and the maximum diameter of the periphery of the stirring part is expressed by D2 (mm), then D1 and D2 satisfy 0.8×D1≤D2≤0.98×D1.

Description

溶融ガラス攪拌装置Molten glass stirring device
　本発明は、溶融ガラスを搬送する溶融ガラス搬送管内、特に、大型のフラットパネルディスプレイ（ＦＰＤ）用の板ガラス製造装置のような、溶融ガラスの搬送量が高い溶融ガラス搬送管内で溶融ガラスを攪拌する溶融ガラス攪拌装置に関する。 The present invention stirs molten glass in a molten glass conveying tube for conveying molten glass, particularly in a molten glass conveying tube having a high molten glass conveying amount, such as a plate glass manufacturing apparatus for a large flat panel display (FPD). The present invention relates to a molten glass stirring device.
　従来から、溶融ガラスの均質性を向上させる目的で、溶融ガラスを搬送する溶融ガラス搬送管内に攪拌装置を取り付け、溶融ガラスを攪拌することが行われている。溶融ガラスの均質性は、生産されるガラスの透明性、厚さ等に大きく影響する。
　攪拌装置は、一般的に回転中心となる中心軸とその周囲に取り付けられた攪拌翼を有する攪拌部から構成される。 Conventionally, for the purpose of improving the homogeneity of molten glass, a stirring device is attached to a molten glass conveying tube for conveying the molten glass to stir the molten glass. The homogeneity of the molten glass greatly affects the transparency and thickness of the produced glass.
The stirrer is generally composed of a stirrer having a central axis serving as a center of rotation and a stirring blade attached around the central axis.
　搬送される溶融ガラスを充分に均質化するためには、溶融ガラス搬送管内を通過する溶融ガラスを攪拌装置により攪拌する際に、攪拌装置内を溶融ガラスがすり抜ける現象、いわゆる「すり抜け」を防止する必要がある。すり抜けた溶融ガラスは、充分に攪拌されていないため、溶融ガラス搬送管を構成する煉瓦や気相との反応などにより溶融ガラスの成分とは異なった成分となったいわゆる「異質成分」が多く含まれており、製品となって溶融ガラスが固化しガラス製品となった場合、その異質成分がいわゆるリームという不透明な筋状の欠点となる。つまり、溶融ガラスを均質化するためには、すり抜けを防止し、溶融ガラスを充分に攪拌することにより、溶融ガラス中に異質成分を拡散させる必要がある。 In order to sufficiently homogenize the molten glass to be conveyed, when the molten glass passing through the molten glass conveying tube is agitated by the agitator, the phenomenon that the molten glass slips through the agitator, so-called “slip-through” is prevented. There is a need. Because the slipped molten glass is not sufficiently stirred, it contains a lot of so-called “foreign components” that are different from the components of the molten glass due to the reaction with the bricks and the gas phase that make up the molten glass conveyance tube. When the molten glass is solidified into a glass product, the extraneous component becomes an opaque streak of so-called ream. In other words, in order to homogenize the molten glass, it is necessary to prevent the slipping through and sufficiently stir the molten glass to diffuse foreign components in the molten glass.
　特許文献１には、流路の壁面に沿って攪拌されずにすり抜ける溶融ガラスを減ずる目的で、該壁面と攪拌翼との間隔を狭めるための攪拌翼の最外側に複数の凸部を配した攪拌装置が提案されている。しかし、この攪拌装置は流路の壁面付近でのすり抜け防止はまだ乏しく、また、攪拌装置の中心軸周辺でのすり抜けが発生しやすいため、溶融ガラスの攪拌効果は充分であるとは言えない。 In Patent Document 1, a plurality of convex portions are arranged on the outermost side of the stirring blade for narrowing the interval between the wall surface and the stirring blade for the purpose of reducing molten glass that passes through the wall surface of the flow path without stirring. A stirrer has been proposed. However, this stirrer is still poor in prevention of slipping near the wall surface of the flow path, and slipping easily occurs around the central axis of the stirrer, so that the stirring effect of the molten glass cannot be said to be sufficient.
　特許文献２に開示の攪拌装置は、溶融ガラスの均質性を向上する目的で、中心軸の周囲に取り付けられる攪拌翼を、回転半径が各々異なる長攪拌翼および短攪拌翼とし、該長攪拌翼および該短攪拌翼を各々２枚以上交互に取り付けることが記載されている。しかし、この攪拌装置であっても、流路の壁面付近や攪拌装置の中心軸周辺でのすり抜け防止効果はまた十分とは言えない。
　なお、均質性を向上させる目的で溶融ガラスを攪拌する手段としては、後述する特許文献３に記載の溶融ガラス攪拌翼も存在する。 The stirrer disclosed in Patent Document 2 has a long stirring blade and a short stirring blade with different rotation radii as the stirring blades attached around the central axis for the purpose of improving the homogeneity of the molten glass. And mounting two or more short stirring blades alternately. However, even with this stirring device, it cannot be said that the effect of preventing slipping around the wall surface of the flow path or around the central axis of the stirring device is sufficient.
In addition, as a means for stirring the molten glass for the purpose of improving the homogeneity, there is also a molten glass stirring blade described in Patent Document 3 described later.
日本国特開２００１－７２４２６号公報Japanese Unexamined Patent Publication No. 2001-72426 日本国特開２００３－６３８２９号公報Japanese Unexamined Patent Publication No. 2003-63829 日本国特開平１０－２６５２２６号公報Japanese Unexamined Patent Publication No. 10-265226
　近年、特に大型のＦＰＤ用のガラス基板には、未融解原料の混在がなく、透明性が高く、平坦度の高いガラスが要求され、欠点の少ない均質性の高いガラスが求められるようになった。
　また、光学用レンズ、光通信用ファイバ、光学フィルタ、太陽電池用基板、蛍光管といった高い透明性が要求される用途のガラスにおいても高い均質性が要求される。
　これらのようなきわめて高い均質性が要求される場合、従来の攪拌装置では溶融ガラスの十分な均質性を得ることが難しくなってきた。 In recent years, glass substrates for large FPDs in particular have not been mixed with unmelted raw materials, are required to have high transparency and high flatness, and high uniformity glass with few defects has been demanded. .
In addition, high homogeneity is also required for glass for applications requiring high transparency such as optical lenses, optical communication fibers, optical filters, solar cell substrates, and fluorescent tubes.
When such extremely high homogeneity is required, it has become difficult to obtain sufficient homogeneity of the molten glass with a conventional stirring apparatus.
　上記した問題点を解決するため、本発明は、攪拌装置内での溶融ガラスのすり抜け、より具体的には、搬送管壁面近傍及び攪拌装置の中心軸周辺での溶融ガラスのすり抜けを防止することができ、かつ、溶融ガラス搬送管内での溶融ガラスの攪拌作用に優れたガラス攪拌装置を提供することを目的とする。 In order to solve the above-mentioned problems, the present invention prevents the molten glass from slipping through the stirring device, more specifically, preventing the molten glass from slipping through the vicinity of the wall surface of the conveying tube and around the central axis of the stirring device. An object of the present invention is to provide a glass stirrer that can be used and that is excellent in the stirring action of molten glass in a molten glass conveying tube.
　本発明は、上記の目的を達成するため、粘度１００～７０００ｄＰａ・ｓの溶融ガラスを搬送量１～５０ｍ3／時間・Ｓ（Ｓは搬送管の断面積）で搬送する溶融ガラス搬送管内で該溶融ガラスを攪拌する溶融ガラス攪拌装置であって、該溶融ガラス攪拌装置は、回転可能な中心軸と、該中心軸に設けられた攪拌部とで構成され、前記攪拌部は、各々板状体からなる横攪拌翼及び縦攪拌翼で構成され、前記横攪拌翼は、長辺が前記中心軸に直交し、短辺が前記中心軸の軸方向に１０～７０度傾斜して設けられ、前記縦攪拌翼は、長辺が前記中心軸と平行して、前記攪拌部の外縁を規定する位置に設けられ、前記攪拌部が設置されている部位における前記溶融ガラス搬送管の直径をＤ1（ｍｍ）、前記攪拌部の前記外縁の最大径をＤ2（ｍｍ）とするとき、０．８×Ｄ1　≦　Ｄ2　≦　０．９８×Ｄ1を満たす溶融ガラス攪拌装置を提供する。 In order to achieve the above object, the present invention achieves the above-mentioned purpose by providing a molten glass having a viscosity of 100 to 7000 dPa · s in a molten glass conveying tube that conveys the molten glass at a conveying amount of 1 to 50 m 3 / hour · S (S is a sectional area of the conveying tube). A molten glass agitating device for agitating molten glass, the molten glass agitating device comprising a rotatable central axis and an agitating portion provided on the central axis, each agitating portion being a plate-like body The horizontal agitating blade is provided with a long side perpendicular to the central axis and a short side inclined by 10 to 70 degrees in the axial direction of the central axis. The vertical agitating blade is provided at a position where the long side is parallel to the central axis and defines the outer edge of the agitating part, and the diameter of the molten glass conveyance tube at the site where the agitating part is installed is D 1 ( mm), the maximum diameter of the outer edge of the agitating portion D 2 and (mm) Rutoki provides molten glass stirring device satisfying 0.8 × D 1 ≦ D 2 ≦ 0.98 × D 1.
　また、本発明は、ガラス溶解装置、板ガラス成形装置、および、前記ガラス溶解装置と前記板ガラス成形装置との間に設けられた溶融ガラス搬送管を有する板ガラス製造装置であって、前記溶融ガラス搬送管に上述した本発明の溶融ガラス攪拌装置が少なくとも１つ設けられた板ガラス製造装置を提供する。 The present invention also relates to a glass melting apparatus, a sheet glass forming apparatus, and a sheet glass manufacturing apparatus having a molten glass conveying tube provided between the glass melting apparatus and the sheet glass forming apparatus, the molten glass conveying tube. A plate glass manufacturing apparatus provided with at least one molten glass stirring device of the present invention described above is provided.
　また、本発明は、本発明の溶融ガラス攪拌装置を用いた溶融ガラス攪拌方法を提供する。 The present invention also provides a molten glass stirring method using the molten glass stirring device of the present invention.
　また、本発明は、本発明の板ガラス製造装置を用いた板ガラス製造方法を提供する。 Moreover, this invention provides the plate glass manufacturing method using the plate glass manufacturing apparatus of this invention.
　本発明のガラス攪拌装置は、攪拌装置内での溶融ガラスのすり抜け、より具体的には、溶融ガラス搬送管壁面近傍及び攪拌装置の中心軸周辺での溶融ガラスのすり抜けを防止することができ、溶融ガラス搬送管内での溶融ガラスの攪拌作用に優れており、攪拌後の溶融ガラスの均質性に優れていることから、特に大型（例えば、一辺が２ｍ以上）のＦＰＤ用ガラス基板等に適した均質性の高いガラスを得ることができる。その結果、未融解原料の混在がなく、透明性が高く、平坦度の高いガラスが得られる。
　また、本発明のガラス攪拌装置は、攪拌後の溶融ガラスの均質性に優れていることから、光学用レンズ、光通信用ファイバ、光学フィルタ、太陽電池用基板、蛍光管といった高い透明性が要求される用途のガラス製造装置の溶融ガラス攪拌装置としても好適である。 The glass stirrer of the present invention can prevent the molten glass from slipping through the stirrer, more specifically, the molten glass can be prevented from slipping near the wall surface of the molten glass transport tube and around the central axis of the stirrer, The molten glass is excellent in the stirring action of the molten glass in the molten glass conveying tube, and is excellent in the homogeneity of the molten glass after stirring, so that it is particularly suitable for a large FPD glass substrate (for example, one side of 2 m or more). Glass with high homogeneity can be obtained. As a result, there is no mixture of unmelted raw materials, and glass with high transparency and high flatness can be obtained.
Further, since the glass stirring device of the present invention is excellent in the homogeneity of the molten glass after stirring, high transparency such as optical lenses, optical communication fibers, optical filters, solar cell substrates, fluorescent tubes is required. It is also suitable as a molten glass stirrer for a glass production apparatus for the intended use.
本発明のガラス攪拌装置の一部を示した斜視図。The perspective view which showed a part of glass stirring apparatus of this invention. 図１に示すガラス攪拌装置の平面図。The top view of the glass stirring apparatus shown in FIG. 図１に示すガラス攪拌装置の側面図。The side view of the glass stirring apparatus shown in FIG. 実施例１で使用した溶融ガラス搬送管の模式図。1 is a schematic diagram of a molten glass conveyance tube used in Example 1. FIG. 比較例１のガラス攪拌装置の側面図。The side view of the glass stirring apparatus of the comparative example 1. FIG. 比較例２のガラス攪拌装置の斜視図。The perspective view of the glass stirring apparatus of the comparative example 2. FIG. 比較例３のガラス攪拌装置の側面図。The side view of the glass stirring apparatus of the comparative example 3. FIG. 実施例１における溶融ガラス搬送管内での流体の挙動を示す模式図。FIG. 3 is a schematic diagram illustrating the behavior of a fluid in a molten glass conveyance tube in the first embodiment. 比較例１における溶融ガラス搬送管内での流体の挙動を示す模式図。The schematic diagram which shows the behavior of the fluid in the molten glass conveyance pipe | tube in the comparative example 1. FIG. 比較例２における溶融ガラス搬送管内での流体の挙動を示す模式図。The schematic diagram which shows the behavior of the fluid in the molten glass conveyance pipe | tube in the comparative example 2. FIG. 比較例３における溶融ガラス搬送管内での流体の挙動を示す模式図。The schematic diagram which shows the behavior of the fluid in the molten-glass conveyance pipe | tube in the comparative example 3. FIG.
　以下、図面を参照して本発明のガラス攪拌装置について説明する。
　ＦＰＤ用のガラス基板は、年々大型化が進み、かつ、その需要の増加により該ガラス基板を大量に生産することがますます求められている。ＦＰＤ用の板ガラスを製造する設備では溶融ガラスの搬送量の増加が求められている。光学用レンズ、光通信用ファイバ、光学フィルタ、太陽電池用基板、蛍光管といった用途のガラスを製造する設備においても、溶融ガラスの搬送量の増加が求められている。
　溶融ガラス搬送管内での溶融ガラスの搬送量を増加させる方法としては、溶融ガラス搬送管の断面積を増加させる方法、溶融ガラス搬送管内における溶融ガラスの流速を増加させる方法がある。
　しかしながら、溶融ガラス搬送管の断面積を極端に増加させることは設備費用の増大となることから好ましくない。また、溶融ガラス搬送管内における溶融ガラスの流速を増加させた場合、攪拌装置内での溶融ガラスのすり抜けが発生しやすくなり、溶融ガラスの攪拌作用が低下しやすくなる。
　本発明のガラス攪拌装置は、このような溶融ガラスの搬送量が高い溶融ガラス搬送管内に設置して使用することが好ましく、具体的には、粘度１００～７０００ｄＰａ・ｓ、好ましくは粘度２００～６０００ｄＰａ・ｓの溶融ガラスを搬送量１～５０ｍ3／時間・Ｓ、好ましくは搬送量２～５０ｍ3／時間・Ｓ（Ｓは搬送管の断面積）で搬送する溶融ガラス搬送管内に設置して使用される。 Hereinafter, the glass stirring device of the present invention will be described with reference to the drawings.
The size of glass substrates for FPD has been increasing year by year, and the demand for such glass substrates has been increasingly demanded due to an increase in demand. In facilities for manufacturing plate glass for FPD, an increase in the transport amount of molten glass is required. In facilities for producing glass for applications such as optical lenses, optical communication fibers, optical filters, solar cell substrates, and fluorescent tubes, an increase in the transport amount of molten glass is also required.
As a method for increasing the transport amount of the molten glass in the molten glass transport tube, there are a method for increasing the cross-sectional area of the molten glass transport tube and a method for increasing the flow rate of the molten glass in the molten glass transport tube.
However, it is not preferable to extremely increase the cross-sectional area of the molten glass conveying pipe because the equipment cost increases. Moreover, when the flow rate of the molten glass in the molten glass conveyance tube is increased, the molten glass slips easily in the stirring device, and the stirring action of the molten glass is likely to be lowered.
The glass stirrer of the present invention is preferably used by being installed in such a molten glass conveyance tube having a high conveyance amount of molten glass. Specifically, the viscosity is 100 to 7000 dPa · s, preferably the viscosity is 200 to 6000 dPa.・ Used by installing it in a molten glass conveyance tube that conveys s molten glass at a conveyance amount of 1 to 50 m 3 / hour · S, preferably at a conveyance amount of 2 to 50 m 3 / hour · S (S is the cross-sectional area of the conveyance tube). Is done.
　図１は、本発明のガラス攪拌装置の一部を示した斜視図であり、図２は、該ガラス攪拌装置の平面図であり、図３は、該ガラス攪拌装置の側面図である。
　図１～３に示すガラス攪拌装置１は、回転可能な中心軸１０を有し、該中心軸１０の下端部に攪拌部２０が設けられている。
　攪拌部２０は、各々板状体からなる、縦攪拌翼３０、および、横攪拌翼４０で構成される。 FIG. 1 is a perspective view showing a part of the glass stirring device of the present invention, FIG. 2 is a plan view of the glass stirring device, and FIG. 3 is a side view of the glass stirring device.
The glass stirring device 1 shown in FIGS. 1 to 3 has a rotatable central shaft 10, and a stirring portion 20 is provided at the lower end of the central shaft 10.
The stirring unit 20 includes a vertical stirring blade 30 and a horizontal stirring blade 40 each made of a plate-like body.
　板状体からなる縦攪拌翼３０は、その長辺が中心軸１０に平行して、かつ、攪拌部２０の外縁を規定する位置に設けられている。別の言い方をすると、平行する中心軸１０と、縦攪拌翼３０と、の間に横攪拌翼４０が位置する。
　縦攪拌翼３０は、主として溶融ガラス搬送管壁面近傍での溶融ガラスのすり抜けを防止すると共に、溶融ガラスを攪拌する機能を有する。 The longitudinal stirring blade 30 made of a plate-like body is provided at a position where the long side is parallel to the central axis 10 and defines the outer edge of the stirring unit 20. In other words, the horizontal stirring blade 40 is positioned between the parallel central shaft 10 and the vertical stirring blade 30.
The vertical stirring blade 30 mainly has a function of preventing the molten glass from slipping near the wall surface of the molten glass conveying tube and stirring the molten glass.
　縦攪拌翼３０は、上下端から中心軸１０方向に延びる支持構造３０ａ，３０ｂを有していることが縦攪拌翼３０の支持強度という点から好ましい。
　したがって、縦攪拌翼の支持強度が得られる場合、支持構造３０ａ，３０ｂは無くてもよい。この場合、縦攪拌翼３０は横攪拌翼４０を介して中心軸１０に間接的に支持される。
　但し、支持構造３０ａ，３０ｂのうち少なくとも一方を有していると好ましい。
　なお、支持構造３０ａ，３０ｂは、縦攪拌翼３０の上下端以外の部位（縦攪拌翼３０の中間部分等）に設ける（３０ａ，３０ｂに相当する支持構造を縦攪拌翼３０の中間部分に設ける）ことも可能であるが、溶融ガラスの攪拌機能を考慮すると、縦攪拌翼３０の上下端に設けることが好ましい。 The vertical stirring blade 30 preferably has support structures 30 a and 30 b extending from the upper and lower ends in the direction of the central axis 10 in terms of the support strength of the vertical stirring blade 30.
Therefore, when the support strength of the vertical stirring blade is obtained, the support structures 30a and 30b may be omitted. In this case, the vertical stirring blade 30 is indirectly supported by the central shaft 10 via the horizontal stirring blade 40.
However, it is preferable to have at least one of the support structures 30a and 30b.
The support structures 30a and 30b are provided in portions other than the upper and lower ends of the vertical stirring blade 30 (such as an intermediate portion of the vertical stirring blade 30) (support structures corresponding to 30a and 30b are provided in the intermediate portion of the vertical stirring blade 30). However, in consideration of the stirring function of the molten glass, it is preferably provided at the upper and lower ends of the vertical stirring blade 30.
　図１～３に示すガラス攪拌装置１は４枚の縦攪拌翼３０を有しているが、本発明のガラス攪拌装置１における縦攪拌翼の数はこれに限定されない。但し、溶融ガラス搬送管壁面近傍での溶融ガラスのすり抜け防止の効果を発揮するためには、中心軸１０に対して対向する位置となるように、少なくとも２枚の縦攪拌翼を設けることが好ましい。
　一方、縦攪拌翼の数が多すぎると溶融ガラスの攪拌をかえって阻害する、攪拌部の回転に要するトルクが増加する等の理由から８枚以下が好ましい。
　したがって、縦攪拌翼の数は２～８枚であることが好ましく、より好ましくは３～６枚である。 The glass stirring device 1 shown in FIGS. 1 to 3 has four vertical stirring blades 30, but the number of vertical stirring blades in the glass stirring device 1 of the present invention is not limited to this. However, in order to exert the effect of preventing slipping of the molten glass in the vicinity of the wall surface of the molten glass conveying tube, it is preferable to provide at least two longitudinal stirring blades so as to be opposed to the central axis 10. .
On the other hand, if the number of longitudinal stirring blades is too large, 8 or less is preferable because the stirring of the molten glass is inhibited and the torque required for the rotation of the stirring unit is increased.
Therefore, the number of vertical stirring blades is preferably 2 to 8, more preferably 3 to 6.
　縦攪拌翼３０の寸法はガラス攪拌装置を設置する溶融ガラス搬送管の寸法や搬送される溶融ガラスの粘度や搬送量に応じて適宜選択される。但し、縦攪拌翼３０の設置位置によって定まる攪拌部２０の外縁の最大径Ｄ2は、ガラス攪拌装置１が設置される部位における搬送管１００の径Ｄ1との関係で下記式（１）を満たす必要がある。
　０．８×Ｄ1　≦　Ｄ2　≦　０．９８×Ｄ1　　　（１）
　上記式（１）を満たすことにより、溶融ガラス搬送管壁面近傍での溶融ガラスのすり抜け防止作用を十分発揮することができ、また、縦攪拌翼３０と溶融ガラス搬送管壁面との接触を防止することができる。
　なお、本発明のガラス攪拌装置の使用時において、溶融ガラス搬送管壁面と、攪拌部２０の外縁と、の距離は一定であることが好ましい。
　溶融ガラス搬送管壁面近傍での溶融ガラスのすり抜け防止作用という点では、０．８５×Ｄ1≦Ｄ2であることが好ましく、０．９×Ｄ1≦Ｄ2であることがより好ましい。 The dimension of the vertical stirring blade 30 is appropriately selected according to the dimension of the molten glass transport pipe in which the glass stirring device is installed, the viscosity of the molten glass being transported, and the transport amount. However, the maximum diameter D 2 of the outer edge of the stirring unit 20 determined by the installation position of the vertical stirring blade 30 is expressed by the following formula (1) in relation to the diameter D 1 of the transport pipe 100 at the site where the glass stirring device 1 is installed. It is necessary to satisfy.
0.8 × D 1 ≦ D 2 ≦ 0.98 × D 1 (1)
By satisfying the above formula (1), it is possible to sufficiently exhibit the action of preventing the molten glass from slipping through in the vicinity of the wall surface of the molten glass conveyance tube, and to prevent contact between the vertical stirring blade 30 and the wall surface of the molten glass conveyance tube. be able to.
In addition, when using the glass stirring apparatus of this invention, it is preferable that the distance of a molten glass conveyance pipe wall surface and the outer edge of the stirring part 20 is constant.
From the viewpoint of preventing the molten glass from slipping near the wall surface of the molten glass conveying tube, 0.85 × D 1 ≦ D 2 is preferable, and 0.9 × D 1 ≦ D 2 is more preferable.
　縦攪拌翼３０の長辺の長さＬは、攪拌部２０の外縁の最大径Ｄ2との関係や、溶融ガラス搬送管１００におけるガラス攪拌装置１を設置可能な部位の長さ、搬送される溶融ガラスの粘度あるいは搬送量に応じて適宜選択される。
　なお、攪拌部２０の外縁の最大径Ｄ2との関係で見た場合、縦攪拌翼３０の長辺の長さＬは、０．５×Ｄ2≦Ｌ≦３×Ｄ2を満たすことが好ましく、Ｄ2≦Ｌ≦２．５×Ｄ2を満たすことがより好ましく、１．２×Ｄ2≦Ｌ≦２×Ｄ2を満たすことがさらに好ましい。 The length L of the long side of the vertical stirring blade 30 is transported by the relationship with the maximum diameter D 2 of the outer edge of the stirring unit 20 or the length of the portion where the glass stirring device 1 can be installed in the molten glass transport tube 100. It is suitably selected according to the viscosity or the transport amount of the molten glass.
Note that when viewed in relation to the maximum diameter D 2 of the outer edge of the stirring unit 20, the length L of the long side of the vertical stirring blade 30 satisfies 0.5 × D 2 ≦ L ≦ 3 × D 2. Preferably, D 2 ≦ L ≦ 2.5 × D 2 is satisfied, and 1.2 × D 2 ≦ L ≦ 2 × D 2 is more preferable.
　縦攪拌翼３０の短辺の幅Ｗは、ガラス攪拌装置１の他の構成要素の寸法、具体的には、攪拌部２０の外縁の最大径Ｄ2、中心軸１０の直径Ｄ3、あるいは横攪拌翼４０の長さとの関係や、搬送される溶融ガラスの粘度や搬送量に応じて適宜選択される。
　なお、攪拌部２０の外縁の最大径Ｄ2との関係で見た場合、縦攪拌翼３０の短辺の幅Ｗは、０．０１×Ｄ2≦Ｗ≦０．２×Ｄ2を満たすことが好ましく、０．０５×Ｄ2≦Ｗ≦０．１５×Ｄ2を満たすことがより好ましく、０．０７×Ｄ2≦Ｗ≦０．１５×Ｄ2を満たすことがさらに好ましい。 The width W of the short side of the vertical stirring blade 30 is the size of the other components of the glass stirring device 1, specifically, the maximum diameter D 2 of the outer edge of the stirring unit 20, the diameter D 3 of the central shaft 10, or the horizontal It is appropriately selected according to the relationship with the length of the stirring blade 40, the viscosity of the molten glass being conveyed, and the conveyance amount.
In addition, when viewed in relation to the maximum diameter D 2 of the outer edge of the stirring unit 20, the width W of the short side of the vertical stirring blade 30 satisfies 0.01 × D 2 ≦ W ≦ 0.2 × D 2. Is more preferable, 0.05 × D 2 ≦ W ≦ 0.15 × D 2 is more preferable, and 0.07 × D 2 ≦ W ≦ 0.15 × D 2 is more preferable.
　縦攪拌翼３０の外側端面および内側端面の幅を縦攪拌翼３０の厚みｔとする。縦攪拌翼３０の厚みｔは、攪拌部２０の外縁の最大径Ｄ2との関係や、縦攪拌翼３０の他の寸法、具体的には、縦攪拌翼３０の長さＬおよび幅Ｗや、縦攪拌翼３０の構成材料、搬送される溶融ガラスの粘度や搬送量に応じて適宜選択される。
　なお、攪拌部２０の外縁の最大径Ｄ2との関係で見た場合、縦攪拌翼３０の厚みｔは、０．０１×Ｄ2≦ｔ≦０．３×Ｄ2を満たすことが好ましく、０．０３×Ｄ2≦ｔ≦０．２×Ｄ2を満たすことがより好ましく、０．０５×Ｄ2≦ｔ≦０．１５×Ｄ2を満たすことがさらに好ましい。
　なお、縦攪拌翼３０の構成材料は、溶融ガラスに対して耐熱性、耐侵食性のある材料であれば、特に限定されず、耐熱性に優れた白金または白金ロジウム合金を使用することが好ましい。また、強度を向上させるために、融点の高いモリブデンを芯材として用い、このモリブデン芯材にアルミナをコーティングし、その上に白金または白金ロジウム合金を被覆した材料なども使用できる。この点については、ガラス攪拌装置の他の構成要素、つまり、中心軸１０および横攪拌翼４０も同様である。 The width of the outer end face and the inner end face of the vertical stirring blade 30 is defined as the thickness t of the vertical stirring blade 30. The thickness t of the vertical stirring blade 30, the relationship and the maximum diameter D 2 of the outer edge of the agitating portion 20, other dimensions of the vertical stirring blade 30, specifically, the length L and width W of the vertical stirring blade 30 Ya Depending on the constituent material of the vertical stirring blade 30, the viscosity of the molten glass to be transported and the transport amount are appropriately selected.
In addition, when viewed in relation to the maximum diameter D 2 of the outer edge of the stirring unit 20, the thickness t of the vertical stirring blade 30 preferably satisfies 0.01 × D 2 ≦ t ≦ 0.3 × D 2 , It is more preferable that 0.03 × D 2 ≦ t ≦ 0.2 × D 2 is satisfied, and it is more preferable that 0.05 × D 2 ≦ t ≦ 0.15 × D 2 is satisfied.
The constituent material of the vertical stirring blade 30 is not particularly limited as long as it is a material having heat resistance and erosion resistance to molten glass, and it is preferable to use platinum or a platinum rhodium alloy having excellent heat resistance. . In addition, in order to improve the strength, it is possible to use a material in which molybdenum having a high melting point is used as a core, alumina is coated on the molybdenum core, and platinum or a platinum rhodium alloy is coated thereon. In this respect, the same applies to the other components of the glass stirring device, that is, the central shaft 10 and the horizontal stirring blade 40.
　板状体からなる横攪拌翼４０は、中心軸１０と、縦攪拌翼３０と、の間に位置している。横攪拌翼４０は、その長辺が中心軸１０に直交し、その短辺が中心軸１０の軸方向に対して傾斜している。以下、本明細書において、板状体からなる横攪拌翼４０が有する二辺のうち、中心軸１０に直交する辺を長辺とし、該長辺に直交する辺を短辺とする。したがって、横攪拌翼の形状によっては、見た目上の長辺－短辺の関係と、本発明における長辺－短辺の関係が逆転する場合もある。また、横攪拌翼４０の短辺が中心軸１０の軸方向に対して傾斜していることを、「横攪拌翼が中心軸に対して傾斜している」という。
　横攪拌翼４０は、縦攪拌翼３０よりも中心軸１０側、特に中心軸１０周辺でのすり抜けを防止すると共に、攪拌部２０が設けられた部位を通過する溶融ガラスの滞留時間を増加させる機能を有する。これにより、縦攪拌翼３０よりも中心軸１０側の溶融ガラスを攪拌する機能が向上する。 The horizontal stirring blade 40 made of a plate-like body is located between the central shaft 10 and the vertical stirring blade 30. The horizontal stirring blade 40 has a long side orthogonal to the central axis 10 and a short side inclined with respect to the axial direction of the central axis 10. Hereinafter, in the present specification, of the two sides of the horizontal stirring blade 40 made of a plate-like body, the side orthogonal to the central axis 10 is the long side, and the side orthogonal to the long side is the short side. Therefore, depending on the shape of the horizontal stirring blade, the apparent long side-short side relationship and the long side-short side relationship in the present invention may be reversed. The fact that the short side of the horizontal stirring blade 40 is inclined with respect to the axial direction of the central axis 10 is referred to as “the horizontal stirring blade is inclined with respect to the central axis”.
The horizontal stirring blade 40 has a function of preventing the slippage on the side of the central shaft 10 relative to the vertical stirring blade 30, particularly around the central shaft 10, and increasing the residence time of the molten glass passing through the portion where the stirring unit 20 is provided. Have Thereby, the function which stirs the molten glass of the center axis | shaft 10 side rather than the vertical stirring blade 30 improves.
　上記した２つの機能を発揮するうえで、中心軸１０に対する横攪拌翼４０の傾斜角αは、１０～７０度であり、３０～６０度であることが好ましく、４０～５０度がより好ましい。 In order to exhibit the above two functions, the inclination angle α of the horizontal stirring blade 40 with respect to the central axis 10 is 10 to 70 degrees, preferably 30 to 60 degrees, and more preferably 40 to 50 degrees.
　図１～３に示すガラス攪拌装置１では、中心軸１０と縦攪拌翼３０との間に上下方向に間隔を開けて４枚の横攪拌翼４０が設けられているが、本発明のガラス攪拌装置１において、中心軸１０と縦攪拌翼３０との間に設ける横攪拌翼の数はこれに限定されず、例えば、中心軸１０と縦攪拌翼３０との間に横攪拌翼４０を１枚のみ設けてもよく、５枚以上の横攪拌翼４０を設けてもよい。但し、中心軸１０と縦攪拌翼３０との間に設ける横攪拌翼が増加すると、それに応じて攪拌部２０を回転させるのに必要なトルクが増加するので、８枚以下であることが好ましい。したがって、中心軸１０と縦攪拌翼３０との間に設ける横攪拌翼の数は１～８枚であることが好ましい。 In the glass stirring apparatus 1 shown in FIGS. 1 to 3, four horizontal stirring blades 40 are provided between the central shaft 10 and the vertical stirring blades 30 with an interval in the vertical direction. In the apparatus 1, the number of horizontal stirring blades provided between the central shaft 10 and the vertical stirring blades 30 is not limited to this. For example, one horizontal stirring blade 40 is provided between the central shaft 10 and the vertical stirring blades 30. Or five or more horizontal stirring blades 40 may be provided. However, when the number of horizontal stirring blades provided between the central shaft 10 and the vertical stirring blades 30 is increased, the torque required to rotate the stirring unit 20 is increased accordingly. Therefore, the number of horizontal stirring blades provided between the central shaft 10 and the vertical stirring blades 30 is preferably 1 to 8.
　攪拌部２０を回転させるのに必要なトルクの増加防止という点では、中心軸１０と縦攪拌翼３０との間に設ける横攪拌翼４０同士の間隔が狭くなりすぎないようにすることに留意する必要がある。図３に示す攪拌部２０の側面形状に着目した場合、中心軸１０、縦攪拌翼３０、および、支持構造３０ａ，３０ｂで囲まれる領域のうち、空隙の部分（つまり、横攪拌翼４０が存在しない部分）の割合が少なくなると、攪拌部２０を回転させるのに必要なトルクが増加するので好ましくない。
　攪拌部２０を回転させるのに必要なトルクの増加防止という点では、中心軸１０、縦攪拌翼３０、および、支持構造３０ａ，３０ｂで囲まれる領域の面積（つまり、横攪拌翼４０が存在する部分の面積Ｓ1（Ｓ1＝ｉ×ｈ）と、空隙の部分の面積Ｓ2（Ｓ2＝ｉ×ｊ）と、の和）に占める横攪拌翼４０が存在する部分の面積Ｓ1の割合（（Ｓ1／（Ｓ1＋Ｓ2）））は８０％以下であることが好ましく、６０％以下であることがより好ましく、２０～６０％であることがさらに好ましい。 It should be noted that the distance between the horizontal stirring blades 40 provided between the central shaft 10 and the vertical stirring blades 30 should not be too narrow in terms of preventing an increase in the torque required to rotate the stirring unit 20. There is a need. When attention is paid to the side surface shape of the stirring unit 20 shown in FIG. 3, there is a space portion (that is, the horizontal stirring blade 40 exists) in the region surrounded by the central shaft 10, the vertical stirring blade 30, and the support structures 30 a and 30 b. If the ratio of the portion not to be used is reduced, the torque required to rotate the stirring unit 20 increases, which is not preferable.
In terms of preventing an increase in the torque required to rotate the stirring unit 20, the area of the region surrounded by the central shaft 10, the vertical stirring blade 30, and the support structures 30a and 30b (that is, the horizontal stirring blade 40 exists). a portion of the area S 1 (S 1 = i × h), and the area S 2 of the portion of the gap (S 2 = i × j) , the area S 1 of the portion lateral agitating blade 40 is present occupy the sum) of The ratio ((S 1 / (S 1 + S 2 ))) is preferably 80% or less, more preferably 60% or less, and further preferably 20 to 60%.
　横攪拌翼４０の長さｉは、ガラス攪拌装置１の他の構成要素の寸法、具体的には、攪拌部２０の外縁の最大径Ｄ2、中心軸１０の直径Ｄ3、縦攪拌翼３０の幅Ｗとの関係に応じて適宜選択される。 The length i of the horizontal stirring blade 40 is the size of the other components of the glass stirring device 1, specifically, the maximum diameter D 2 of the outer edge of the stirring unit 20, the diameter D 3 of the central shaft 10, and the vertical stirring blade 30. It is appropriately selected according to the relationship with the width W.
　横攪拌翼４０の高さｈは、上記した（Ｓ1／（Ｓ1＋Ｓ2））の関係や、横攪拌翼４０の傾斜角α、搬送される溶融ガラスの粘度や搬送量に応じて適宜選択される。 The height h of the horizontal stirring blade 40 is appropriately determined according to the relationship (S 1 / (S 1 + S 2 )) described above, the inclination angle α of the horizontal stirring blade 40, the viscosity of the molten glass being transported, and the transport amount. Selected.

　横攪拌翼４０の厚みは、横攪拌翼４０の他の寸法、具体的には、横攪拌翼４０の長さｉおよび高さｈや、横攪拌翼４０の構成材料、搬送される溶融ガラスの粘度や搬送量に応じて適宜選択される。横攪拌翼４０の長さｉとの関係で見た場合、横攪拌翼４０の構成材料が上述した材料の場合、０．００５×ｉ≦厚み≦０．４×ｉであることが好ましく、０．０１×ｉ≦厚み≦０．２×ｉであることがより好ましく、０．０１５×ｉ≦厚み≦０．１×ｉであることがさらに好ましい。
The thickness of the horizontal agitating blade 40 depends on other dimensions of the horizontal agitating blade 40, specifically, the length i and the height h of the horizontal agitating blade 40, the constituent material of the horizontal agitating blade 40, and the molten glass to be conveyed. It is appropriately selected according to the viscosity and the conveyance amount. When viewed in relation to the length i of the horizontal stirring blade 40, when the constituent material of the horizontal stirring blade 40 is the above-described material, it is preferable that 0.005 × i ≦ thickness ≦ 0.4 × i. More preferably, 0.01 × i ≦ thickness ≦ 0.2 × i, and even more preferably 0.015 × i ≦ thickness ≦ 0.1 × i.
　図１～３に示すガラス攪拌装置１では、溶融ガラスの攪拌作用を向上させるため、中心軸１０の外周に取り付けられる構造物（縦攪拌翼３０、横攪拌翼４０）の支持強度を高めるため等の理由から中心軸１０のうち、攪拌部２０を構成する部分が拡径している。 In the glass stirring device 1 shown in FIGS. 1 to 3, in order to improve the stirring action of the molten glass, in order to increase the support strength of the structures (vertical stirring blades 30 and horizontal stirring blades 40) attached to the outer periphery of the central shaft 10. For this reason, the diameter of the portion of the central shaft 10 constituting the stirring unit 20 is increased.
　但し、中心軸１０の直径が大きくなると、攪拌部２０を回転させるのに必要なトルクが増加する点に留意する必要がある。また、中心軸１０の直径が大きくなると、図３の中心軸１０、縦攪拌翼３０、および、支持構造３０ａ，３０ｂで囲まれる領域が狭くなる。この領域で縦攪拌翼３０よりも中心軸１０側を通過する溶融ガラスを攪拌することから、この領域が狭くなりすぎると、横攪拌翼４０による溶融ガラスの攪拌機能がかえって低下するので好ましくない。
　上記の理由から攪拌部２０の外縁の最大径Ｄ2（ｍｍ）と、中心軸１０の直径（より具体的には、中心軸１０のうち、ガラス攪拌部２０を構成する下端部付近の直径）Ｄ3（ｍｍ）と、がＤ3≦０．６×Ｄ2であることが好ましく、Ｄ3≦０．５×Ｄ2であることがより好ましく、Ｄ3≦０．４５×Ｄ2であることがさらに好ましい。
　但し、中心軸１０の直径が小さすぎると、旋回時の応力によって中心軸が破損するおそれがある。この観点から、中心軸１０の構成材料が上述した材料の場合、攪拌部２０の外縁の最大径Ｄ2（ｍｍ）と、中心軸１０の直径（より具体的には、中心軸１０のうち、ガラス攪拌部２０を構成する下端部付近の直径）Ｄ3と、が、Ｄ3≧０．１×Ｄ2を満たすことが好ましい。 However, it should be noted that the torque required to rotate the stirring unit 20 increases as the diameter of the central shaft 10 increases. Further, when the diameter of the central shaft 10 is increased, a region surrounded by the central shaft 10, the vertical stirring blade 30 and the support structures 30a and 30b in FIG. 3 is narrowed. In this region, the molten glass passing through the central axis 10 side from the vertical stirring blade 30 is stirred. Therefore, if this region is too narrow, the function of stirring the molten glass by the horizontal stirring blade 40 is lowered, which is not preferable.
For the above reason, the maximum diameter D 2 (mm) of the outer edge of the stirring unit 20 and the diameter of the central shaft 10 (more specifically, the diameter of the central shaft 10 near the lower end portion constituting the glass stirring unit 20). D 3 (mm) is preferably D 3 ≦ 0.6 × D 2 , more preferably D 3 ≦ 0.5 × D 2 , and D 3 ≦ 0.45 × D 2 . More preferably.
However, if the diameter of the central shaft 10 is too small, the central shaft may be damaged by stress during turning. From this viewpoint, when the constituent material of the central shaft 10 is the material described above, the maximum diameter D 2 (mm) of the outer edge of the stirring unit 20 and the diameter of the central shaft 10 (more specifically, of the central shaft 10, It is preferable that D 3 ≧ 0.1 × D 2 satisfies the diameter D 3 near the lower end constituting the glass stirring unit 20.
　特許文献３には、回転軸９、第１平板３，４、第３平板７，８、および、回転軸９の軸方向に対して角度θ２にて傾斜している第２平板５，６を有する溶融ガラス攪拌翼１が開示されている（本願図６参照）。
　同文献の溶融ガラス攪拌翼は、小規模連続炉での攪拌を目的とするものであり、流量の少ない、即ち、ある程度の時間溶解槽内に保持される溶融ガラスを攪拌するものである。
　そして、第２平板５，６が回転軸９の軸方向に対して角度θ２にて傾斜しているのは、溶解槽内に保持される溶融ガラスを該溶解槽の上部側に押し上げるためである。
　一方、本発明のガラス攪拌装置は、粘度１００～７０００ｄＰａ・ｓの溶融ガラスを搬送量１～５０ｍ3／時間・Ｓ（Ｓは搬送管の断面積）で搬送する溶融ガラス搬送管内に設置して使用されるため、縦攪拌翼は、搬送管壁面近傍での溶融ガラスのすり抜けを防止し、溶融ガラス搬送管壁面近傍の溶融ガラスを攪拌させるものである。
　したがって、特許文献３に開示の第２平板５，６のように溶融ガラスを上部側に押し上げるものであってはならない。 Patent Document 3 includes a rotary shaft 9, first flat plates 3 and 4, third flat plates 7 and 8, and second flat plates 5 and 6 that are inclined at an angle θ2 with respect to the axial direction of the rotary shaft 9. A molten glass stirring blade 1 is disclosed (see FIG. 6 of the present application).
The molten glass stirring blade of the same document is intended for stirring in a small-scale continuous furnace, and stirs the molten glass having a small flow rate, that is, held in the melting tank for a certain period of time.
The reason why the second flat plates 5 and 6 are inclined at an angle θ2 with respect to the axial direction of the rotating shaft 9 is to push up the molten glass held in the melting tank to the upper side of the melting tank. .
On the other hand, the glass stirrer of the present invention is installed in a molten glass conveyance tube that conveys molten glass having a viscosity of 100 to 7000 dPa · s at a conveyance amount of 1 to 50 m 3 / hour · S (S is a cross-sectional area of the conveyance tube). Since it is used, the vertical stirring blade prevents the molten glass from slipping through in the vicinity of the wall surface of the conveying tube and stirs the molten glass in the vicinity of the wall surface of the molten glass conveying tube.
Therefore, the molten glass should not be pushed upward as in the second flat plates 5 and 6 disclosed in Patent Document 3.
　さらに、特許文献３の溶融ガラス攪拌翼は、攪拌部の外縁位置（同文献の図２に示す幅寸法Ｉ）が溶解槽の内径に対して約２／３程度の寸法が好ましいとされている。幅寸法Ｉを上記好適範囲よりも大きくすると、回転軸９の軸方向に対して傾斜して設けられた第２平板５，６が溶解槽の内壁に接触するおそれがある。 Furthermore, in the molten glass stirring blade of Patent Document 3, the outer edge position of the stirring section (width dimension I shown in FIG. 2 of the same document) is preferably about 2/3 of the inner diameter of the dissolution tank. . If the width dimension I is larger than the above preferred range, the second flat plates 5 and 6 provided to be inclined with respect to the axial direction of the rotary shaft 9 may come into contact with the inner wall of the dissolution tank.
　したがって、特許文献３の溶融ガラス攪拌翼では溶融ガラス搬送管壁面近傍での溶融ガラスのすり抜け防止、及び、溶融ガラスの攪拌効果を得ることができない。 Therefore, with the molten glass stirring blade of Patent Document 3, it is impossible to prevent the molten glass from slipping near the wall surface of the molten glass conveying tube and to obtain the effect of stirring the molten glass.
　次に、本発明の溶融ガラス攪拌方法について説明する。本発明の溶融ガラスの攪拌方法では、図４に示すように、溶融ガラスが搬送される溶融ガラス搬送管内に本発明のガラス攪拌装置１を設置し、該溶融ガラス搬送管内の溶融ガラスを攪拌する。
　本発明の適用対象は特に限定されないが、粘度１００～７０００ｄＰａ・ｓの溶融ガラスを搬送量１～５０ｍ3／時間・Ｓ（Ｓは搬送管の断面積）で搬送する溶融ガラス搬送管に対して適用することが好ましい。
　また、本発明の溶融ガラスの攪拌方法は、攪拌後の溶融ガラスが均質性に優れることから、ＦＰＤ用のガラス基板、光学用レンズ、光通信用ファイバ、光学フィルタ、太陽電池用基板、蛍光管のように、均質性についての要求がきわめて厳しい用途のガラスを製造する過程で実施される溶融ガラスの攪拌に適用することが好ましい。
　本発明の溶融ガラス攪拌方法において、溶融ガラスの攪拌条件は特に限定されず、使用するガラス攪拌装置の構成（縦攪拌翼および横攪拌翼の枚数等）やガラス攪拌装置の各部の寸法、ガラス攪拌装置を設置する溶融ガラス搬送管の寸法、溶融ガラス搬送管内を搬送される溶融ガラスに関する条件（溶融ガラスの粘度、搬送量等）に応じて適宜選択すればよい。 Next, the molten glass stirring method of the present invention will be described. In the molten glass stirring method of the present invention, as shown in FIG. 4, the glass stirring device 1 of the present invention is installed in the molten glass transport tube through which the molten glass is transported, and the molten glass in the molten glass transport tube is stirred. .
The application target of the present invention is not particularly limited, but for a molten glass conveyance tube that conveys a molten glass having a viscosity of 100 to 7000 dPa · s at a conveyance amount of 1 to 50 m 3 / hour · S (S is a cross-sectional area of the conveyance tube). It is preferable to apply.
Moreover, since the molten glass after stirring is excellent in homogeneity, the molten glass stirring method of the present invention has a glass substrate for FPD, an optical lens, an optical communication fiber, an optical filter, a solar cell substrate, and a fluorescent tube. Thus, it is preferable to apply to the stirring of the molten glass carried out in the process of producing the glass for applications in which the requirement for homogeneity is extremely severe.
In the molten glass stirring method of the present invention, the stirring conditions of the molten glass are not particularly limited, and the configuration of the glass stirring device to be used (number of vertical stirring blades and horizontal stirring blades, etc.), dimensions of each part of the glass stirring device, glass stirring What is necessary is just to select suitably according to the conditions (the viscosity of a molten glass, the conveyance amount, etc.) regarding the molten glass conveyed in the dimension of the molten glass conveyance pipe which installs an apparatus, and the inside of a molten glass conveyance pipe.
　次に、本発明の板ガラス製造装置について説明する。板ガラス製造装置は、最小限の構成として、ガラス原料を溶解させて溶融ガラスとするガラス溶解装置、溶融ガラスを成形して板ガラスとする板ガラス成形装置（例えば、フロート法やダウンドロー法による成形装置）、および、該ガラス溶解装置で得られた溶融ガラスを板ガラス成形装置に搬送する目的で、該ガラス溶解装置と該板ガラス成形装置との間に設けられた溶融ガラス搬送管を有する。板ガラス製造装置は、ガラス溶解装置、および、板ガラス成形装置以外の構成要素を通常有している。このような他の構成要素の一例を挙げると、溶融ガラスの清澄を行うための減圧脱泡装置がある。そして、これらの構成要素間で溶融ガラスを搬送するため、板ガラス製造装置は通常複数の溶融ガラス搬送管を有している。本発明の板ガラス製造装置では、これら複数存在する溶融ガラス搬送管のいずれか１つ、あるいは、複数に上述した本発明のガラス攪拌装置が設置されている。本発明の板ガラス製造装置において、本発明のガラス攪拌装置を設置する位置は特に限定されない。したがって、板ガラス製造装置を構成するいずれの溶融ガラス搬送管に本発明のガラス攪拌装置を設置してもよい。また、設置するガラス攪拌装置の数も特に限定されない。但し、板ガラス製造装置は、構成要素として減圧脱泡装置を含む場合、減圧脱泡装置の上流側の溶融ガラス搬送管および減圧脱泡装置の下流側の溶融ガラス搬送管のうち、少なくとも一方に本発明のガラス攪拌装置を設置することが均質性の高い板ガラスを製造するうえで好ましく、減圧脱泡装置の上流側の溶融ガラス搬送管および減圧脱泡装置の下流側の溶融ガラス搬送管の両方に本発明のガラス攪拌装置を設置することがより好ましい。なお、攪拌翼の回転のトルク変動をトルク測定器を設けてモニタリングすることにより、撹拌翼または搬送管の変形や破損等を事前に察知して対処することができるため好ましい。
　本発明の板ガラス製造装置は、様々な用途の板ガラスの製造に適用可能であるが、ＦＰＤ用のガラス基板のように、均質性についての要求がきわめて厳しい用途の板ガラスの製造に適用することが特に好ましい。
　本発明の板ガラス製造装置を用いて板ガラスを製造することにより、未融解原料の混在がなく、透明性が高く、平坦度が高い板ガラスが得られる。 Next, the plate glass manufacturing apparatus of the present invention will be described. The plate glass manufacturing apparatus has, as a minimum configuration, a glass melting apparatus that melts glass raw materials to form molten glass, and a sheet glass forming apparatus that forms molten glass to form sheet glass (for example, a molding apparatus using a float method or a downdraw method). And in order to convey the molten glass obtained with this glass melting apparatus to a sheet glass shaping | molding apparatus, it has the molten glass conveyance pipe provided between this glass melting apparatus and this sheet glass shaping | molding apparatus. The sheet glass manufacturing apparatus usually has components other than the glass melting apparatus and the sheet glass forming apparatus. As an example of such other components, there is a vacuum degassing device for refining molten glass. And in order to convey a molten glass between these components, the plate glass manufacturing apparatus has a some molten glass conveyance tube normally. In the plate glass manufacturing apparatus of the present invention, the above-described glass stirring apparatus of the present invention is installed in any one or a plurality of these molten glass transport pipes. In the plate glass manufacturing apparatus of the present invention, the position where the glass stirring apparatus of the present invention is installed is not particularly limited. Therefore, you may install the glass stirring apparatus of this invention in any molten glass conveyance tube which comprises a plate glass manufacturing apparatus. Moreover, the number of the glass stirring apparatus to install is not specifically limited. However, when the plate glass production apparatus includes a vacuum degassing apparatus as a constituent element, at least one of the molten glass conveyance pipe on the upstream side of the vacuum degassing apparatus and the molten glass conveyance pipe on the downstream side of the vacuum defoaming apparatus is installed in the plate glass manufacturing apparatus. It is preferable to install the glass stirring device of the invention in producing a highly homogenous plate glass, both in the molten glass conveyance tube on the upstream side of the vacuum degassing device and in the molten glass conveyance tube on the downstream side of the vacuum degassing device. It is more preferable to install the glass stirring device of the present invention. It is preferable to monitor the torque fluctuation of the rotation of the stirring blade by providing a torque measuring device so that deformation or breakage of the stirring blade or the conveyance pipe can be detected and dealt with in advance.
The plate glass manufacturing apparatus of the present invention can be applied to the manufacture of plate glass for various uses, but it is particularly applicable to the manufacture of plate glass for uses where the requirements for homogeneity are extremely severe, such as a glass substrate for FPD. preferable.
By producing plate glass using the plate glass production apparatus of the present invention, plate glass having no transparency, high transparency, and high flatness can be obtained.
　以下の実施例および比較例では、溶融ガラス搬送管内を搬送される溶融ガラスの攪拌作用についてモデル試験（溶融ガラスを模擬した流体を使用しての実験）を実施した。図４は、モデル試験で使用した溶融ガラス搬送管の模式図であり、図１～３に示すガラス攪拌装置１が溶融ガラス搬送管内に配置された状態で示されている（但し、模式的に示しているため、図３とは形状が必ずしも一致していない）。モデル試験において、流体は図中矢印方向に移動する。図４に示す溶融ガラス搬送管の寸法は以下の通り。
直径（主管、枝管とも）：４０ｍｍ
主管下面から枝管（左）の上面までの高さ：５０ｍｍ
主管下面から枝管（右）の上面までの高さ：１００ｍｍ
　また、該溶融ガラス搬送管内を搬送される流体に関する条件は以下の通り。
粘度：４００ｄＰａ・ｓ
搬送量３０ｍ3／時間・Ｓ In the following examples and comparative examples, a model test (an experiment using a fluid simulating molten glass) was performed on the stirring action of molten glass conveyed in a molten glass conveyance tube. FIG. 4 is a schematic diagram of the molten glass conveyance tube used in the model test, and shows a state in which the glass stirring device 1 shown in FIGS. 1 to 3 is disposed in the molten glass conveyance tube (however, schematically As shown, the shape does not necessarily match that of FIG. 3). In the model test, the fluid moves in the direction of the arrow in the figure. The dimensions of the molten glass conveyance tube shown in FIG. 4 are as follows.
Diameter (both main and branch pipes): 40mm
Height from the lower surface of the main pipe to the upper surface of the branch pipe (left): 50mm
Height from the lower surface of the main pipe to the upper surface of the branch pipe (right): 100mm
Moreover, the conditions regarding the fluid conveyed in this molten glass conveyance pipe are as follows.
Viscosity: 400dPa · s
Carrying amount 30m 3 / hour ・ S
実施例１
　図１～３に示す本発明のガラス攪拌装置１を搬送管内に挿入して攪拌した際の流体の挙動を評価した。ガラス攪拌装置の各部の寸法は以下の通り。
攪拌部２０の外縁の最大径Ｄ2：３８ｍｍ
中心軸１０の直径（攪拌部２０を構成する部分）Ｄ3：１０ｍｍ
縦攪拌翼３０の長さＬ：６０ｍｍ
縦攪拌翼３０の幅Ｗ：３．８ｍｍ
縦攪拌翼３０の厚みｔ：３．８ｍｍ
中心軸１０に対する横攪拌翼４０の傾斜角α：６０度
横攪拌翼４０の長さｉ１０．２ｍｍ
横攪拌翼４０の高さｈ：８ｍｍ
横攪拌翼４０の厚み：２ｍｍ
中心軸１０、縦攪拌翼３０、および支持構造３０ｂ、３０ｃで囲まれる領域の面積（つまり、横攪拌翼４０が存在する部分の面積Ｓ1と、空隙の部分の面積Ｓ2と、の和）に占める横攪拌翼４０が存在する部分の面積Ｓ1の割合（Ｓ1／（Ｓ1＋Ｓ2））：３０％
　ガラス攪拌装置１は、攪拌部２０の下端部が枝管（左）の中央からの高さが２０ｍｍとなる位置まで挿入し、回転数１０ｒｐｍで回転させた。
　図８は攪拌時の流体の挙動を模式的に示した図である。図８から明らかなように、本発明のガラス攪拌装置によれば、溶融ガラス搬送管壁面近傍および中心軸周辺での流体のすり抜けを効果的に防止することができる。この結果、溶融ガラスを模擬した流体は攪拌作用により切断され（符号１００）、徐々に引き伸ばされて（符号２００）下流へと流れる。 Example 1
The behavior of the fluid when the glass stirrer 1 of the present invention shown in FIGS. 1 to 3 was inserted into the conveying tube and stirred was evaluated. The dimensions of each part of the glass stirrer are as follows.
Maximum diameter D 2 of the outer edge of the stirring unit 20: 38 mm
Diameter of central axis 10 (part constituting stirring unit 20) D 3 : 10 mm
Length L of the vertical stirring blade 30: 60 mm
Width W of the vertical stirring blade 30: 3.8 mm
Thickness t of the vertical stirring blade 30: 3.8 mm
Inclination angle α of the horizontal stirring blade 40 with respect to the central axis 10: 60 ° The length i of the horizontal stirring blade 40 is 10.2 mm.
Horizontal stirring blade height h: 8 mm
Thickness of the horizontal stirring blade 40: 2 mm
Central axis 10, the vertical stirring blade 30, and the supporting structure 30b, the area of the region surrounded by 30c (i.e., the sum of the area S 1 of the portion lateral agitating blade 40 is present, the area S 2 of the portion of the air gap) Of the area S 1 of the portion where the horizontal stirring blades 40 occupy (S 1 / (S 1 + S 2 )): 30%
The glass stirrer 1 was inserted until the lower end of the stirring unit 20 was 20 mm in height from the center of the branch pipe (left), and rotated at a rotation speed of 10 rpm.
FIG. 8 is a diagram schematically showing the behavior of the fluid during stirring. As is apparent from FIG. 8, according to the glass stirring device of the present invention, fluid can be effectively prevented from slipping around the wall surface of the molten glass conveying tube and around the central axis. As a result, the fluid simulating the molten glass is cut by the stirring action (reference numeral 100), gradually stretched (reference numeral 200), and flows downstream.
比較例１
　図５に示すガラス攪拌装置１´ａを使用した。図５に示すガラス攪拌装置１´ａは、横攪拌翼４０が存在しない点を除いて実施例のガラス攪拌装置１と同様である。図９は攪拌時の流体の挙動を模式的に示した図である。図９から明らかなように、比較例１のガラス攪拌装置１´ａによれば、搬送管壁面近傍での流体のすり抜けは防止できるが、搬送管の中心付近（攪拌装置の中心軸周辺）での流体のすり抜けが発生した。この結果、溶融ガラスを模擬した流体は切断されることなくそのまま下流へと流出した。 Comparative Example 1
A glass stirring apparatus 1′a shown in FIG. 5 was used. The glass stirrer 1′a shown in FIG. 5 is the same as the glass stirrer 1 of the embodiment except that the horizontal stirring blade 40 does not exist. FIG. 9 is a diagram schematically showing the behavior of the fluid during stirring. As can be seen from FIG. 9, according to the glass stirring apparatus 1′a of Comparative Example 1, it is possible to prevent fluid from slipping near the wall surface of the transport pipe, but near the center of the transport pipe (around the central axis of the stirring apparatus). The fluid slipped through. As a result, the fluid simulating the molten glass flowed downstream without being cut.
比較例２
　図６に示すガラス攪拌装置１´ｂを使用した。図６に示すガラス攪拌装置１´ｂは、特許文献３の図１に示される溶融ガラス攪拌翼と同様の形状である。図６に示すガラス攪拌装置１´ｂの各部の寸法は以下の通り。
中心軸１０´の直径：１０ｍｍ
攪拌翼３０´（同公報第２平板に相当）の長さ：１０ｍｍ
攪拌翼３０´の幅：１２．５ｍｍ
攪拌翼３０´の厚み：３ｍｍ
中心軸１０´に対する攪拌翼３０´の傾斜角：４５度
攪拌翼４０´（同公報の第１平板、第３平板に相当）の長さ：７ｍｍ
攪拌翼４０´の高さ：３ｍｍ
攪拌翼４０´の厚み：２ｍｍ
中心軸１０に対する攪拌翼４０´の傾斜角：４５度
　図１０は攪拌時の流体の挙動を模式的に示した図である。図１０から明らかなように、比較例２のガラス攪拌装置１´ｂは、搬送管の中心付近（攪拌装置の中心軸周辺）の流体の攪拌作用はあり、溶融ガラスを模擬した流体は切断されて（符号１００）、徐々に引き伸ばされたが（符号２００）、搬送管壁面近傍での流体のすり抜けを防止することができなかった。 Comparative Example 2
A glass stirring apparatus 1′b shown in FIG. 6 was used. The glass stirring apparatus 1′b shown in FIG. 6 has the same shape as the molten glass stirring blade shown in FIG. The dimensions of each part of the glass stirrer 1′b shown in FIG. 6 are as follows.
Diameter of central axis 10 ': 10mm
Length of stirring blade 30 '(corresponding to the second flat plate in the same publication): 10mm
Width of stirring blade 30 ': 12.5mm
Thickness of stirring blade 30 ': 3mm
Inclination angle of stirring blade 30 ′ with respect to central axis 10 ′: 45 ° stirring blade 40 ′ (corresponding to the first flat plate and the third flat plate in the publication) length: 7 mm
Height of stirring blade 40 ': 3mm
Stirring blade 40 'thickness: 2mm
Inclination angle of stirring blade 40 'with respect to central axis 10: 45 degrees FIG. 10 is a diagram schematically showing the behavior of fluid during stirring. As is clear from FIG. 10, the glass stirring apparatus 1′b of Comparative Example 2 has a stirring action of the fluid near the center of the transport pipe (around the central axis of the stirring apparatus), and the fluid simulating the molten glass is cut. (Reference numeral 100), although it was gradually stretched (reference numeral 200), it was not possible to prevent the fluid from slipping near the wall surface of the transfer pipe.
比較例３
　図７に示すガラス攪拌装置１´ｃを使用した。図７に示すガラス攪拌装置１´ｃは、特許文献１の図１に示される均質化装置と同様の形状である。図７に示すガラス攪拌装置１´ｃの各部の寸法は以下の通り。
中心軸１０´の直径：１０ｍｍ
攪拌翼３０´´（同公報の攪拌翼１２に相当）の長さ（縦方向）：６０ｍｍ
攪拌翼３０´´の長さ（横方向）：１９ｍｍ
攪拌翼３０´´の厚み：３．８ｍｍ
傾斜部材４０´´の長さ：１７．６ｍｍ
傾斜部材４０´´の厚み：３．８ｍｍ
中心軸１０´に対する傾斜部材４０´´の傾斜角：６０度
凸部５０の長さ：７ｍｍ
凸部５０の高さ：５ｍｍ
　なお、傾斜部材４０´´はその長手軸は中心軸１０´に対して傾斜しているが、その短軸は中心軸１０´に対して傾斜していない。
　図１１は攪拌時の流体の挙動を模式的に示した図である。図１１から明らかなように、比較例３のガラス攪拌装置１´ｃによれば、搬送管壁面近傍での流体のすり抜けはやや防止されているが、搬送管の中心付近（攪拌装置の中心軸周辺）の流体の攪拌作用に劣っていた。この結果、溶融ガラスを模擬した流体は切断されたが（符号１００）、引き伸ばされることなくそのまま下流へと流出した（符号３００）。 Comparative Example 3
A glass stirring apparatus 1′c shown in FIG. 7 was used. The glass stirring device 1′c shown in FIG. 7 has the same shape as the homogenizing device shown in FIG. The dimensions of each part of the glass stirrer 1′c shown in FIG. 7 are as follows.
Diameter of central axis 10 ': 10mm
Length (longitudinal direction) of stirring blade 30 ″ (corresponding to stirring blade 12 of the same publication): 60 mm
Length of stirring blade 30 ″ (lateral direction): 19 mm
Thickness of stirring blade 30 '': 3.8mm
Length of inclined member 40 ″: 17.6mm
Tilting member 40 ″ thickness: 3.8 mm
Inclination angle of the inclined member 40 ″ with respect to the central axis 10 ′: 60 degrees The length of the convex portion 50: 7 mm
Height of convex part 50: 5 mm
The long axis of the inclined member 40 ″ is inclined with respect to the central axis 10 ′, but the short axis is not inclined with respect to the central axis 10 ′.
FIG. 11 is a diagram schematically showing the behavior of the fluid during stirring. As can be seen from FIG. 11, according to the glass stirring device 1′c of Comparative Example 3, fluid slipping near the wall surface of the transport pipe is somewhat prevented, but the vicinity of the center of the transport pipe (the central axis of the stirring device) The stirring action of the surrounding fluid was inferior. As a result, the fluid simulating the molten glass was cut (reference numeral 100), but flowed downstream without being stretched (reference numeral 300).
実施例２
　板ガラス製造の例として、ガラス溶解装置、第１の溶融ガラス搬送管、減圧脱泡装置、第２の溶融ガラス搬送管、および、フロート成形装置を有する板ガラス製造装置を用いて板ガラスを製造する。第１および第２の溶融ガラス搬送管には、図１～３に示す本発明のガラス攪拌装置１が設置されている。
　ガラス溶解装置でガラス原料を加熱溶融して溶融ガラスを得る。溶融ガラスは、第１の溶融ガラス搬送管、減圧脱泡装置、第２の溶融ガラス搬送管、および、フロート成形装置をこの順に通過して板ガラスに成形される。溶融ガラスは、第１および第２の溶融ガラス搬送管を搬送される過程で本発明のガラス攪拌装置により攪拌されて均質性が向上され、未融解原料の混在がなく、透明性が高く、平坦度が高い板ガラスが得られる。 Example 2
As an example of plate glass production, plate glass is produced using a glass melting device, a first molten glass conveyance tube, a vacuum degassing device, a second molten glass conveyance tube, and a plate glass production device having a float forming device. The first and second molten glass transport pipes are provided with the glass stirring device 1 of the present invention shown in FIGS.
A glass raw material is heated and melted with a glass melting apparatus to obtain molten glass. The molten glass passes through the first molten glass conveyance tube, the vacuum degassing device, the second molten glass conveyance tube, and the float forming device in this order and is formed into a sheet glass. The molten glass is stirred by the glass stirrer of the present invention in the process of being transported through the first and second molten glass transport pipes to improve the homogeneity, has no mixture of unmelted raw materials, has high transparency, and is flat. A plate glass with a high degree is obtained.
　本出願を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。
　本出願は、２００９年２月２７日出願の日本特許出願（特願２００９-０４７２２４）に基づくものであり、その内容はここに参照として取り込まれる。 Although this application has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application filed on Feb. 27, 2009 (Japanese Patent Application No. 2009-047224), the contents of which are incorporated herein by reference.
　１，１´ａ，１´ｂ，１´ｃ：ガラス攪拌装置
　１０，１０´：中心軸
　２０：ガラス攪拌部
　３０：縦攪拌翼
　３０ａ，３０ｂ：支持構造
　４０：横攪拌翼
　３０´，３０´´，４０´：攪拌翼
　４０´´：傾斜部材
　５０：凸部
　１００：搬送管 1, 1'a, 1'b, 1'c: Glass stirrer 10, 10 ': Central axis 20: Glass stirrer 30: Vertical stirring blade 30a, 30b: Support structure 40: Horizontal stirring blade 30', 30 '',40': Stirring blade 40 ": Inclined member 50: Convex part 100: Conveying pipe

Claims (6)

  1. 　粘度１００～７０００ｄＰａ・ｓの溶融ガラスを搬送量１～５０ｍ3／時間・Ｓ（Ｓは搬送管の断面積）で搬送する溶融ガラス搬送管内で該溶融ガラスを攪拌する溶融ガラス攪拌装置であって、該溶融ガラス攪拌装置は、
    　回転可能な中心軸と、
    　該中心軸に設けられた攪拌部とで構成され、
    　前記攪拌部は、各々板状体からなる横攪拌翼及び縦攪拌翼で構成され、
    　前記横攪拌翼は、長辺が前記中心軸に直交し、短辺が前記中心軸の軸方向に１０～７０度傾斜して設けられ、
    　前記縦攪拌翼は、長辺が前記中心軸と平行して、前記攪拌部の外縁を規定する位置に設けられ、
    　前記攪拌部が設置されている部位における前記溶融ガラス搬送管の直径をＤ1（ｍｍ）、前記攪拌部の前記外縁の最大径をＤ2（ｍｍ）とするとき、
    　０．８×Ｄ1　≦　Ｄ2　≦　０．９８×Ｄ1　
    　を満たす溶融ガラス攪拌装置。     A molten glass stirring device for stirring molten glass in a molten glass conveying tube for conveying a molten glass having a viscosity of 100 to 7000 dPa · s at a conveying amount of 1 to 50 m 3 / hour · S (S is a cross-sectional area of the conveying tube). The molten glass stirring device is:
    A rotatable central axis,
    It is composed of a stirring unit provided on the central shaft,
    The stirring unit is composed of a horizontal stirring blade and a vertical stirring blade each made of a plate-like body,
    The horizontal stirring blade is provided such that a long side is perpendicular to the central axis and a short side is inclined by 10 to 70 degrees in the axial direction of the central axis.
    The vertical stirring blade is provided at a position where the long side is parallel to the central axis and defines the outer edge of the stirring unit,
    When the diameter of the molten glass transport tube at the site where the stirring unit is installed is D 1 (mm), and the maximum diameter of the outer edge of the stirring unit is D 2 (mm),
    0.8 × D 1 ≦ D 2 ≦ 0.98 × D 1
    A molten glass stirrer that satisfies the requirements.
  2. 　前記中心軸の直径をＤ3（ｍｍ）とするとき、
    　Ｄ3　≦　０．６×Ｄ2
    　を満たす請求項１に記載の溶融ガラス攪拌装置。     When the diameter of the central axis is D 3 (mm),
    D 3 ≦ 0.6 × D 2
    The molten glass stirring apparatus according to claim 1 satisfying
  3. 　ガラス溶解装置、板ガラス成形装置、および、前記ガラス溶解装置と前記板ガラス成形装置との間に設けられた溶融ガラス搬送管を有する板ガラス製造装置であって、
    　前記溶融ガラス搬送管に請求項１または２に記載の溶融ガラス攪拌装置が少なくとも１つ設けられた板ガラス製造装置。     A glass melting apparatus, a sheet glass forming apparatus, and a sheet glass manufacturing apparatus having a molten glass transport pipe provided between the glass melting apparatus and the sheet glass forming apparatus,
    The plate glass manufacturing apparatus by which the molten glass stirring apparatus of Claim 1 or 2 was provided in the said molten glass conveyance pipe | tube.
  4. 　前記ガラス溶解装置と、前記板ガラス成形装置と、の間に設けられた減圧脱泡装置をさらに有し、前記溶融ガラス搬送管が、前記ガラス溶解装置と前記減圧脱泡装置との間に設けられた第１の溶融ガラス搬送管と、前記減圧脱泡装置と前記板ガラス成形装置との間に設けられた第２の溶融ガラス搬送管と、からなり、前記第１および第２の溶融ガラス搬送管のうち少なくとも一方に、前記溶融ガラス攪拌装置が少なくとも１つ設けられた請求項３に記載の板ガラス製造装置。 The apparatus further includes a vacuum degassing apparatus provided between the glass melting apparatus and the sheet glass forming apparatus, and the molten glass transport pipe is provided between the glass melting apparatus and the vacuum degassing apparatus. A first molten glass transport tube, and a second molten glass transport tube provided between the vacuum degassing device and the sheet glass forming device, the first and second molten glass transport tubes. The plate glass manufacturing apparatus according to claim 3, wherein at least one of the molten glass stirring apparatuses is provided on at least one of the apparatus.
  5. 　請求項１または２に記載の溶融ガラス攪拌装置を用いた溶融ガラス攪拌方法。 A molten glass stirring method using the molten glass stirring device according to claim 1.
  6. 　請求項３または４に記載の板ガラス製造装置を用いた板ガラス製造方法。 The plate glass manufacturing method using the plate glass manufacturing apparatus of Claim 3 or 4.
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