초록 ▼

The invention relates to a skull pot (1) for melting, crystallizing or refining inorganic substances. Said pot comprises a pot wall (1.1), a pot bottom (1.2), an induction coil (2) which surrounds the pot wall (1.1) and by means of which high-frequency energy can be coupled into the content of the p

The invention relates to a skull pot (1) for melting, crystallizing or refining inorganic substances. Said pot comprises a pot wall (1.1), a pot bottom (1.2), an induction coil (2) which surrounds the pot wall (1.1) and by means of which high-frequency energy can be coupled into the content of the pot. The pot wall (1.1) is formed by a ring of metal pipes which can be connected to a cooling medium. Slits are embodied between adjacent metal pipes. The bottom (1.2) is provided with a discharge for the melt (3). A sleeve (4) is allocated to the discharge. The admission end (4.1) of the sleeve (4) protrudes far into the inner chamber of the skull pot (1) in such a way that, during use, the melt (3) can be withdrawn through the crystallized bottom layer (3.3) in a controlled manner without the danger of impairing quality.

대표청구항 ▼

1. A skull crucible for melting or refining inorganic substances, in particular glass or glass ceramics, the crucible comprising:a crucible wall;a crucible base cooperating with said crucible wall to form an inner chamber;an induction coil surrounding the crucible wall and via which high frequency-e

1. A skull crucible for melting or refining inorganic substances, in particular glass or glass ceramics, the crucible comprising:a crucible wall;a crucible base cooperating with said crucible wall to form an inner chamber;an induction coil surrounding the crucible wall and via which high frequency-energy is coupled to contents of the crucible;wherein the crucible wall is formed from a crown of metal tubes which can be connected to a coolant, with slotted interstices between adjacent metal tubes;the base has a run-off for the melt;a sleeve is assigned to the run-off and defines an inlet end;the inlet end of the sleeve protrudes into the inner chamber of the skull crucible so that the inorganic melt can be removed through a crystallized layer of the inorganic melt formed on the base in a controlled manner without the danger of impairing its quality; anda temperature regulating device assigned to the sleeve and selectively adjusting the temperature of the sleeve such that the temperature of the sleeve is lowered during melting and raised during run-off of the melt.2. A skull crucible as claimed in claim 1, characterized in that the upper edge of the sleeve is at a height of between a tenth to a half of the melt height measured from the base of the crucible.3. A skull crucible as claimed in claim 1, characterized in that an upper area of the sleeve projecting into the melt and forming a cavity is double-walled, and in that the cavity has an inlet and an outlet for a coolant.4. A skull crucible as claimed in claim 3, characterized by the following features:the sleeve has two coaxial sleeves;the outer sleeve is a metal jacket;the inner sleeve is a quartz glass tube.5. A skull crucible as claimed in claim 3, characterized in that the sleeve is height-adjustable.6. A skull crucible as claimed in claim 1, characterized by the following features:the sleeve has two coaxial sleeves including an outer sleeve and an inner sleeve;the outer sleeve is a metal jacket;the inner sleeve is a quartz glass tube.7. A skull crucible as claimed in claim 6, characterized in that the sleeve is height-adjustable.8. A skull crucible as claimed in claim 1, characterized in that the sleeve is height-adjustable.9. A skull crucible as claimed in claim 1, characterized in that the sleeve is made from a noble metal.10. A skull crucible as claimed in claim 9, characterized in that the noble metal of the sleeve is platinum or a platinum alloy.11. A skull crucible for melting or refining inorganic substances, in particular glass or glass ceramics, the crucible comprising:a crucible wall;a crucible base cooperating with said crucible wall to form an inner chamber;an induction coil surrounding the crucible wall and via which high frequency-energy is coupled to contents of the crucible;wherein the crucible wall is formed from a crown of metal tubes which can be connected to a coolant, with slotted interstices between adjacent metal tubes, the base has a run-off for the melt, and a sleeve is assigned to the run-off and defines an inlet end, the inlet end of the sleeve protrudes into the inner chamber of the skull crucible so that the inorganic melt can be removed through a crystallized layer of the inorganic melt formed on the base in a controlled manner without the danger of impairing its quality, the sleeve has two coaxial sleeves including an inner and outer sleeve, the outer sleeve is a metal jacket, and the inner sleeve is a quartz glass tube.12. A skull crucible as claimed in claim 11, characterized in that the sleeve is assigned a temperature regulating device for adjusting the temperature of the sleeve.13. A skull crucible as claimed in claim 11, characterized in that the sleeve is height-adjustable.14. A skull crucible as claimed in claim 11 characterized in that an upper area of the sleeve projecting into the melt and forming a cavity is double-walled, and in that the cavity has an inlet and an outlet for a coolant.15. A skull crucible as claimed in claim 11, characterized in that the sleeve is made from a noble metal.16. A method for melting or refining inorganic substances, in particular glass or glass ceramics, the method comprising:melting the inorganic substances in an inner chamber of a skull crucible having a crucible wall and a crucible base, the crucible base comprising a run-off for the melt to which a sleeve is assigned;cooling the sleeve during melting such that a crystallized layer of the inorganic substances is developed on the sleeve to protect the sleeve from corrosion by the melted inorganic substances; andraising the sleeve to allow removal of the melt.17. The method of claim 16 wherein the sleeve is made from a noble metal.18. The method of claim 16 wherein the noble metal is platinum or a platinum alloy.