US3376373A - Electric glassmaking furnace - Google Patents
Electric glassmaking furnace Download PDFInfo
- Publication number
- US3376373A US3376373A US438574A US43857465A US3376373A US 3376373 A US3376373 A US 3376373A US 438574 A US438574 A US 438574A US 43857465 A US43857465 A US 43857465A US 3376373 A US3376373 A US 3376373A
- Authority
- US
- United States
- Prior art keywords
- furnace
- glass
- chamber
- bubbles
- electric
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
- C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
- C03B5/027—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
- C03B5/0275—Shaft furnaces
-
- 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
- C03B5/225—Refining
-
- 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 has as its object modifications and improvements applied to this furnace.
- the refining device comprises two horizontal discs with an approximately plane or conical surface, brought nearer towards one another at least at their edges, the spacing between the discs communicating with one or more escape orifices for the bubbles and with an extraction device for the fine glass; the escape orifice for the bubbles communicates with the interior of the trough, and the extraction device for the fine glass communicates with the exterior of the trough; the means which enable the portion of the withdrawn glass to be subjected to a rapid rise of temperature, consist of a source of electric current, the terminals of which are connected respectively to the two discs of said device.
- the furnace according to the present invention differs from this embodiment by modifications which result from studies and experiments aimed at further improving the yield of the furnace and of simplifying its construction.
- a first series of experiments has shown that it was possible to suppress the current circulating between the discs, by varying the voltage at the terminals of the lateral electrodes in a manner such as to bring them nearer to central electrode, in other words, operating with the same power but with a lower voltage and, consequently, with a higher intensity, which has the effect of overheating the central part of the furnace indirectly and of thus obtaining a glass which is sutficiently fluid so that the separation of the bubbles can be effected.
- the furnace is thus considerably simplified, and its parts have a resistance to wear which is particularly beneficial.
- the invention thus provides an electric glassmaking furnace of the type described in American Patent No. 3,147,328 which furnace is characterized especially in that the refining device comprises a single element disposed between the electrodes, this element itself not being connected to any source of voltage.
- this element has the shape of a cup or bowl, its concavity being directed upwards, this bowl being supported by the hollow rod which constitutes the passage for withdrawing the fine glass.
- FIG. 1 is an elevation view, in section, of the refining device according to the invention and of one of the electrodes;
- FIG. 2 is a plan view of the refining device and of the three electrodes.
- the refining device comprises a single refining element 101 supported by the rod 27 pierced by a passage 28 for the extraction of fine glass.
- These parts 101, 27, 28 are preferably of molybdenum. They are centered with respect to the three melting electrodes 11a, 11b, He, supported respectively by conducting rods 9a, 9b, 90.
- These electrodes and rods are like wise of molybdenum; the electrodes 11a, 11b, 110 have concave cylindrical faces 12a, 12b, 12c directed towards the axis of symmetry XX of the device.
- the element 101 has the shape of a cup with an upwardly directed concavity, or preferably, the shape of a bowl with a spherical or, as shown, a conical bottom.
- crushed molybdenum pieces 102 of, for example, of 5 to 10 mm; these regulate the absorption of the glass above the level of the bowl, and enhance the collecting of the bubbles in the numberous battles thus formed, which fact enhances the ascent of these bubbles.
- the electrodes 9a to can be of partially fused pressed molybdenum, such as described in the patent application for Process for Manufacturing Electrodes for Furnaces for the Electric Melting of Glassware and Electrode Obtained by Carrying Out Said Process, Ser. No. 439,391, filed Mar. 12, 1965.
- An electric glassmaking furnace comprising a trough having a chamber, a refining device disposed in the trough in the hottest region of the chamber, said device comprising means for withdrawing in the course of the continuous pouring a portion of the molten glass in said region and thus removing it from the large movements due to the convection currents prevailing in the chamber, means for subjecting said portion to a rapid rise of temperature so as to diminish the viscosity and increase the size of the bubbles which are thus separated from the fine glass, means for discharging the fine glass thus obtained to the exterior as production thereof proceeds, and means for returning to the bath inside the furnace the thus-separated bubbles, said refining device comprising a single element disposed between electrodes, said element being unconnected to any source of voltage.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Furnace Details (AREA)
- Glass Melting And Manufacturing (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Resistance Heating (AREA)
- Manufacture And Refinement Of Metals (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR967754A FR85479E (fr) | 1964-03-17 | 1964-03-17 | Four électrique de verrerie |
Publications (1)
Publication Number | Publication Date |
---|---|
US3376373A true US3376373A (en) | 1968-04-02 |
Family
ID=8825763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US438574A Expired - Lifetime US3376373A (en) | 1964-03-17 | 1965-03-10 | Electric glassmaking furnace |
Country Status (10)
Country | Link |
---|---|
US (1) | US3376373A (cs) |
AT (1) | AT259149B (cs) |
BE (1) | BE660952A (cs) |
CS (1) | CS157010B2 (cs) |
DE (1) | DE1258559B (cs) |
ES (1) | ES310671A2 (cs) |
FR (1) | FR85479E (cs) |
GB (1) | GB1096862A (cs) |
LU (1) | LU48194A1 (cs) |
NL (1) | NL142651B (cs) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4592770A (en) * | 1984-06-15 | 1986-06-03 | Gaf Corporation | Glass melter |
US10570045B2 (en) | 2015-05-22 | 2020-02-25 | John Hart Miller | Glass and other material melting systems |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3147328A (en) * | 1961-05-10 | 1964-09-01 | Verreries Phochet Et Du Courva | Electric glassmaking furnace |
-
1964
- 1964-03-17 FR FR967754A patent/FR85479E/fr not_active Expired
-
1965
- 1965-03-10 US US438574A patent/US3376373A/en not_active Expired - Lifetime
- 1965-03-10 DE DEV28029A patent/DE1258559B/de active Pending
- 1965-03-11 BE BE660952D patent/BE660952A/xx unknown
- 1965-03-12 GB GB10637/65A patent/GB1096862A/en not_active Expired
- 1965-03-12 CS CS167065A patent/CS157010B2/cs unknown
- 1965-03-15 AT AT233765A patent/AT259149B/de active
- 1965-03-15 LU LU48194A patent/LU48194A1/xx unknown
- 1965-03-17 ES ES0310671A patent/ES310671A2/es not_active Expired
- 1965-03-17 NL NL656503401A patent/NL142651B/xx not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3147328A (en) * | 1961-05-10 | 1964-09-01 | Verreries Phochet Et Du Courva | Electric glassmaking furnace |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4592770A (en) * | 1984-06-15 | 1986-06-03 | Gaf Corporation | Glass melter |
US10570045B2 (en) | 2015-05-22 | 2020-02-25 | John Hart Miller | Glass and other material melting systems |
Also Published As
Publication number | Publication date |
---|---|
BE660952A (cs) | 1965-07-01 |
CS157010B2 (cs) | 1974-08-23 |
AT259149B (de) | 1967-12-27 |
NL6503401A (cs) | 1965-09-20 |
DE1258559B (de) | 1968-01-11 |
ES310671A2 (es) | 1965-06-16 |
FR85479E (fr) | 1965-08-20 |
LU48194A1 (cs) | 1965-05-15 |
GB1096862A (en) | 1967-12-29 |
NL142651B (nl) | 1974-07-15 |
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