Patent DE-102008047123-A1 (DE)
Title: Feeder for portioning a molten glass strand into individual glass gobs with predeterminable weight and/or shape, comprises a dish, which receives receiving liquid glass coming from a melting furnace and has an outlet channel on both sides
Inventor: LINDNER WALTER
IPC: C03B7/086
Filed: 2008-09-15
Abstract: The feeder comprises a dish (1), which receives receiving liquid glass coming from a melting furnace and has an outlet channel on both sides, where the outlet channel opens into an outlet opening (5), a plunger (2) extending itself into the outlet channel and forming a cylindrical flow field (4) for liquid glass together with the outlet channel, and a cylindrical zone enclosing the plunger above the outlet channel with a distance. A lower boundary surface of the cylindrical zone determines a specified passage for the liquid glass together with one of its opposing areas of the dish bottom. The feeder comprises a dish (1), which receives receiving liquid glass coming from a melting furnace and has an outlet channel on both sides, where the outlet channel opens into an outlet opening (5), a plunger (2) extending itself into the outlet channel and forming a cylindrical flow field (4) for the liquid glass together with the outlet channel, a cylindrical zone enclosing the plunger above the outlet channel with a distance, where a lower boundary surface of the cylindrical zone determines a specified passage for the liquid glass together with one of its opposing areas of the bottom of the dish, and paddle elements spatially provided at the outer wall of the plunger or the inner wall of the cylindrical zone in the circumferential direction, where the paddle elements pass under at a peak angle to the horizontal and effect upwardly and/or downwardly directed glass streams in an annular chamber between the cylindrical zone and the plunger. The cylindrical zone assigned to the cyclically drivable lobe plunger for performing upwards and downward movements is formed by a rotating tube (3), whose front surface determines a specifiable passage for the liquid glass related to the free cross-section together with one of its opposing areas of the bottom of the dish. The paddles extend over more than the half of the width of the gap between the rotating tube and the plunger and up to directly adjacent to the opposing wall. The two opposing paddles are diametrically provided to each other. The contour of the free ends of the paddles is adapted to the contour of each opposing wall. The paddles provided at the plunger or rotating tube have a length in the circumferential direction, where the length corresponds to the diameter of the plunger. The paddles are displaceably arranged to each other by overlapping their orbits in the axial direction. The angle of the effective paddle surfaces is located at 10-40[deg] related to the horizontals. The paddles and paddle opposing surfaces are coated with platinum or are made of tin, platinum alloy or molybdenum. The paddles are located in the area of the lower ends of the rotating tube, and are arranged in the annular chamber formed between a plunger shaft present itself above the plunger and the cylindrical zone located above the supply channel during using screw plungers or stirring plungers. The diameter of the plunger shaft present inside the paddles is equal or larger than the total diameter of the plunger area bearing a thread or a stirring lug. A glass bath surface is located in the cylindrical zone above the paddle elements arranged in the cylindrical zone. The paddle elements have first and second active surfaces inversely pointed to each other in the radial direction. The first active surface that is adjacent to the plunger or plunger shaft produces an upwardly pointed flow and the second active surface produces a downwardly pointed flow. The inclination of the first and second active surfaces is directed same related to the horizontals but in opposite direction. Each flat paddle element is wrapped for forming first and second active surfaces. The cylindrical zone and the cylindrical flow field coaxial to the cylindrical zone have same diameter. The plunger shaft has a smaller diameter than the plunger bearing the thread or stirring lug. An independent claim is included for a stirrer cell useful in glass industries.