Four wing, non-intermeshing rotors for synchronous drive to provide improved dispersive and distributive mixing in internal batch mixers
AssigneeFarrel Corporation
InventorsLefteris Valsamis, Frank Borzenski, Robert Wagner, Walter Rapetski, Hans Baurmeister
Life of this patent
Estimating the term…
Abstract
Four wing rotors for used in an internal batch mixer. The rotor has two long wings, and these two long wings have different approach angles and helix angles. The rotor has two short wings and these short wings also preferably have different helix angles and approach angles. The rotors provide improved distributive and dispersive mixing allowing for greater productivity in processing materials and producing more homogeneously mixed materials at lower discharge temperatures.
Claims34
A four wing rotor for use in an internal, intensive batch mixing machine, the rotor having an axis and an axial length from a first end of the rotor to an opposite second end of the rotor and having multiple wings of generally helical configuration including first and second long wings and first and second short wings;
- the first long wing originating at the first end of the rotor at about 0° angular position relative to the rotor axis and having a wing tip oriented to the rotor axis at a helix angle of between about 45° and 60° and having an axial length of between about 60% to about 80% of the axial length of the rotor and an approach angle in the range of from about 25° to 60°;
- the second long wing on the rotor originating at the second end of the rotor at about 220° to about 240° angular position relative to the rotor axis and having a wing tip oriented to the rotor axis at a helix angle of between about 20° to 40° and having an axial length of between about 60% to 80% of the axial length of the rotor and an approach angle of between about 15° and 25° with the proviso that the approach angle of the first long wing is greater than the approach angle of the second long wing by at least 5°;
- the wing tips of each of the first and second long wings having a width, as measured normal to the helix angle of the wing, with the width of the first long wing tip being at least 50% wider than the width of the second long wing tip;
- the first short wing on the rotor originating at the first end of the rotor at an angular position in the range of about 170° to about 190° relative to the rotor axis, having a wing tip oriented to the rotor axis at a helix angle in the range of from about 25° to 60°°, and having an axial length of between about 10% and 30% of the axial length of the rotor;
- the second short wing on the rotor originating at the second end of the rotor at an angular position in the range of about 350° to about 20° relative to the rotor axis, having a wing tip oriented to the rotor axis at a helix angle in the range of from about 25° to 60°, and having an axial length of between about 10% and 30% of the axial length of the rotor;
- and
- each of the first and second long wings and first and second short wings having their wing tips an essentially equivalent radial distance from the axis of the rotor.
Dependencies are inferred from the claim text.