Device for stirring molten gas

Patent metadata

Field	Value
Publication number	US-10676385-B2
Application number	US-201615552589-A
Country	US
Kind code	B2
Filing date	Feb 22, 2016
Priority date	Feb 23, 2015
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

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 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 ), 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 (N A , P A , Q A , R A ).

First claim

The invention claimed is:

1. 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 (N A , P A , Q A , R A ), and wherein the one or more inner stirrer blades ( 5 , 6 ) are helicoidal blades or a helicoidal blade, and
wherein the angular component (N A , P A , Q A , R A ) of said normal vector (N, P, Q, R) of at least a blade section of one or more of said inner and outer stirrer blades ( 5 , 6 , 7 , 8 ) is negative and the angular component (N A , P A , Q A , R A ) of said normal vector (N, P, Q, R) of at least a blade section of one or more of the inner and outer stirrer blades ( 5 , 6 , 7 , 8 ) is positive.

2. Stirrer according to claim 1 , 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 ).

3. Stirrer according to claim 2 , 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°.

4. Stirrer according to claim 2 , wherein at least one of the outer stirrer blades ( 7 , 8 ) is an open flat ring-shaped elliptical segment, said at least one open flat ring-shaped elliptical segment being placed following a line formed by the intersection of a cylinder and a plane making an angle (β), between 0° and 90° excluding said values, with the central axis of that cylinder, said central axis of the cylinder being co-linear with the central axis (L) of the shaft ( 2 ) of the stirrer ( 1 ).

5. Stirrer according to claim 2 , wherein the outer edge of at least one of the one or more outer stirrer blades ( 7 , 8 ) is provided with a raised edge ( 10 ).

6. Stirrer according to claim 1 , wherein the stirrer comprises two or more of said inner stirrer blades ( 5 , 6 ), whereby the angular component (N A , P A ) of the normal vector (N, P) of at least one of said inner stirrer blades ( 5 , 6 ) is negative and the angular component (N A , P A ) of the normal vector (N, P) of at least one other of said inner stirrer blades ( 5 , 6 ) is positive and whereby the number and size of said inner stirrer blades ( 5 , 6 ) having a normal vector (N, P) with a negative angular component (N A , P A ) is the same as the number and size of said inner stirrer blades having a normal vector (N, P) with a positive angular component (N A , P A ).

7. Stirrer according to claim 1 , wherein the one or more outer stirrer blades ( 7 , 8 ) in totality comprise two or more blade sections, whereby the angular component (Q A , R A ) of the normal vector (Q, R) of at least one of said blade sections is negative and the angular component (Q A , R A ) of the normal vector (Q, R) of at least one other of said blade sections is positive and whereby the number and size of said blade sections having a normal vector (Q, R) with a negative angular component (Q A , R A ) is the same as the number and size of said blade sections having a normal vector (Q, R) with a positive angular component (Q A , R A ).

8. Stirrer according to claim 1 , wherein at least a blade section of one of said one or more outer stirrer blades ( 7 , 8 ) extends over a certain axial section of the shaft ( 1 ), whereby at least one of said one or more inner stirrer blades ( 5 , 6 ) is placed in the same axial section, whereby the signs of the angular components (N A , P A , Q A , R A ) of the normal vectors (N, P, Q, R) of this inner stirrer blade ( 5 , 6 ) and this blade section of the outer stirrer blade ( 7 , 8 ) are opposite.

9. Stirrer according to claim 1 , wherein at least some of said one or more inner and outer stirrer blades ( 5 , 6 , 7 , 8 ) are disposed at an angle (α, β) to the central longitudinal axis (L) which is between 10° and 80° including said values.

10. Stirrer ( 1 ) according to claim 1 , wherein said stirrer ( 1 ) is made of platinum or a platinum alloy or of molybdenum or a molybdenum-based alloy, or of iridium or an iridium-based alloy.

11. 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 (N A , P A , Q A , R A ), 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 ).

12. 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)

Assignees

• Umicore Ag & Co Kg

Inventors

• Schollmayer Jörg
• Heitzenröther Michael

Classifications

• B01F7/0095

  Operations & Transport · mapped topic

• C03B5/1672

  Use of materials therefor · CPC title

• B01F7/00425

  Operations & Transport · mapped topic

• C03B5/1675

  Platinum group metals · CPC title

• C03B7/086 Primary

  Plunger mechanisms · CPC title