Device for stirring molten gas

Stirrer (1) for stirring molten glass (16), whereby the stirrer (1) comprises

• a shaft (2) having a tip (4) and having a central longitudinal axis (L), and
• one or more inner stirrer blades (5, 6) which are attached to the shaft (2), and
• one or more outer stirrer blades (7, 8) which are attached to the shaft (2), whereby the one or more inner stirrer blades (5, 6) are attached closer to the shaft (2) than the one or more outer stirrer blades (7, 8),
• whereby, when considering the stirrer in a cylindrical coordinate system (11) with the longitudinal axial coordinate (z) of the cylindrical coordinate system (11) defined to coincide with the central longitudinal axis (L), whereby the cylindrical coordinate system (11) is further defined by a radial coordinate (ρ) and an angular coordinate (φ), both the one or more inner stirrer blades (5,6) as well as the one or more outer stirrer blades (7,8) disposed at an angle (α, β) to the central longitudinal axis (L), whereby said angle (α, β) is between 0° and 90° not including these values, and are disposed having a least a blade section with a normal vector (N, P, Q, R), on the side directed towards the tip (4), with an angular component (NA, PA, QA, RA), and wherein the one or more inner stirrer blades (5,6) are helicoidal blades or a helicoidal blade and wherein the one or more helicoidal inner stirrer blades (5,6) are mounted directly against the shaft (2).

Stirrer (1) for stirring molten glass (16), whereby the stirrer (1) comprises

• a shaft (2) having a tip (4) and having a central longitudinal axis (L), and
• two or more inner stirrer blades (5,6) which are attached to the shaft (2), and
• two or more outer stirrer blades (7,8) which are attached to the shaft (2), whereby the inner stirrer blades (5,6) are attached closer to the shaft (2) than the outer stirrer blades (7,8),
• whereby, when considering the stirrer in a cylindrical coordinate system (11) with the longitudinal axial coordinate (z) of the cylindrical coordinate system (11) defined to coincide with the central longitudinal axis (L), whereby the cylindrical coordinate system (11) is further defined by a radial coordinate (ρ) and an angular coordinate (φ), both the two or more inner stirrer blades (5,6) as well as the one or more outer stirrer blades (7,8) are disposed at an angle (α, β) to the central longitudinal axis (L), whereby said angle (α, β) is between 0° and 90° not including these values, and are disposed having a least a blade section with a normal vector (N, P, Q, R), on the side directed towards the tip (4), with an angular component (NA, PA, QA, RA), and wherein the two or more outer stirrer blades (7,8) each have two ends, whereby each of these ends is mounted on a different one of said rods (9) or tubes, whereby the rods (9) or tubes used for mounting the ends of a specific outer stirrer blade (7,8) have a different angular position and/or axial position on the shaft (2).

A plunger (18) for gobbing molten glass, said plunger comprising a stirrer (1) for stirring molten glass (16), whereby the stirrer (1) comprise

• a shaft (2) having a tip (4) and having a central longitudinal axis (L), and
• one or more inner stirrer blades (5, 6) which are attached to the shaft (2), and
• one or more outer stirrer blades (7, 8) which are attached to the shaft (2), whereby the one or more inner stirrer blades (5, 6) are attached closer to the shaft (2) than the one or more outer stirrer blades (7, 8),
• whereby, when considering the stirrer in a cylindrical coordinate system (11) with longitudinal axial coordinate (z) of the cylindrical coordinate system (11) defined to coincide with the central longitudinal axis (L), whereby the cylindrical coordinate system (11) is further defined by a radial coordinate (ρ) and an angular coordinate (φ), both the one or more inner stirrer blades (5,6) as well as the one or more outer stirrer blades (7,8) are disposed at an angle (α, β) to the central longitudinal axis (L), whereby said angle (α, β) is between 0° and 90° not including these values, and are disposed having a least a blade section with a normal vector (N, P, Q, R), on the side directed towards the tip (4), with an angular component (NA, PA, QA, RA), and wherein the one or more inner stirrer blades (5,6) are helicoidal blades or a helicoidal blade, and said stirrer (1) comprising on its tip (4) a gobbing element (19).

Stirrer (1) for stirring molten glass (16), whereby the stirrer (1) comprises

• a shaft (2) having a tip (4) and having a central longitudinal axis (L), and
• two or more inner stirrer blades (5,6) which are attached to the shaft (2), and
• one or more outer stirrer blades (7,8) which are attached to the shaft (2), whereby the two or more inner stirrer blades (5,6) are attached closer to the shaft (2) than the one or more outer stirrer blades (7,8),
• whereby, when considering the stirrer in a cylindrical coordinate system (11) with the longitudinal axial coordinate (z) of the cylindrical coordinate system (11) defined to coincide with the central longitudinal axis (L), whereby the cylindrical coordinate system (11) is further defined by a radial coordinate (ρ) and an angular coordinate (φ), both the one or more inner stirrer blades (5,6) as well as the one or more outer stirrer blades (7,8) are disposed at an angle (α, β) to the central longitudinal axis (L), whereby said angle (α, β) is between 0° and 90° not including these values, and are disposed having a least a blade section with a normal vector (N, P, Q, R), on the side directed towards the tip (4), with an angular component (NA, PA, QA, RA), and wherein the two or more inner stirrer blades (5,6) include at least two independent, axially spaced inner stirrer blades (5,6) that are configured to promote molten glass flow in an axial direction toward each other.

A stirrer (1) for stirring molten glass (16), whereby the stirrer (1) comprises

• a shaft (2) having a tip (4) and having a central longitudinal axis (L), and
• one or more inner stirrer blades (5, 6) which are attached to the shaft (2), and
• one or more outer stirrer blades (7, 8) which are attached to the shaft (2), whereby the one or more inner stirrer blades (5, 6) are attached closer to the shaft (2) than the one or more outer stirrer blades (7, 8),
• whereby, when considering the stirrer in a cylindrical coordinate system (11) with the longitudinal axial coordinate (z) of the cylindrical coordinate system (11) defined to coincide with the central longitudinal axis (L), whereby the cylindrical coordinate system (11) is further defined by a radial coordinate (ρ) and an angular coordinate (φ), both the one or more inner stirrer blades (5,6) as well as the one or more outer stirrer blades (7,8) are disposed at an angle (α, β) to the central longitudinal axis (L), whereby said angle (α, β) is between 0° and 90° not including these values, and are disposed having a least a blade section with a normal vector (N, P, Q, R), on the side directed towards the tip (4), with an angular component (NA, PA, QA, RA), wherein the one or more inner stirrer blades (5,6) are helicoidal blades or a helicoidal blade, wherein the one or more outer stirrer blades (7,8) are mounted on rods (9) or tubes extending at least partially in a radial direction from the shaft (2), and wherein the one or more outer stirrer blades (7,8) are each mounted on two or more of said rods (9) or tubes, whereby the rods (9) or tubes used for mounting an outer stirrer blade (7,8) are placed at angular positions on the shaft which are mutually different by at least 30°.