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US 4,744,668 AGranted
Internal batch mixing machines with non-intermeshing rotors of increased performance
AssigneeFarrel Corporation
InventorNarku O. Nortey
Life of this patent
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AssigneeFarrel Corporation
InventorNarku O. Nortey
Estimating the term…
Non-intermeshing four-wing and three-wing rotors for use in high intensity mixing machines of the batch type provide new sequences and new characteristics of dynamic interactions for achieving advantageously increased mixing effectiveness and strength of the rotors. These new rotors are adapted for driving at unequal speed (unsynchronized rotation) or at equal speed (synchronized rotation). In the four-wing rotors, long wings and short wings both originate from both ends of the rotor. The new four-wing and three-wing rotors intensify axial mixing action and transverse distributive mixing for causing the mixes (batches) to become more homogeneous. The markedly increased twist angles T in both types of rotors decreases the volume of material "sitting" at the center of the mixer for maximizing the dispersive mixing or high shear occurring between wing tips and wall surface of each rotor cavity. The marked increase in helix angles A enhance distributive (blending) mixing by rolling banks of material in axial directions in the rotor cavities with components of axial movement and axial flow. The larger ratios of axial wing length to rotor length increase the propelling of material from near the originating end of the long wing in an axial direction along the cavity over near to the other end of the cavity and then back again with back-and-forth zig-zag like motions for enhancing distributive mixing and blending. Randomization of blending is advantageously achieved by each rotor by rolling the banks of material back-and-forth with differing velocities in opposite directions. The new interactions of these rotors produce numerous advantages and mixing features.
In an internal mixing machine of the batch type including housing means defining a mixing chamber shaped to accommodate two counter-rotating non-intermeshing winged rotors on parallel horizontal axes in said mixing chamber with a central region of the mixing chamber located generally between said rotors, said housing means having an inlet with associated means for introducing materials into said mixing chamber to be mixed into a homogeneous mass and having a closable outlet for discharging the mixed materials from said mixing chamber and including drive means for rotating said rotors in opposite directions around their respective axes, a pair of non-intermeshing rotors comprising:
In an internal mixing machine of the batch type including housing means defining a mixing chamber having two cavities shaped to accommodate two counter-rotating non-intermeshing winged rotors on parallel horizontal axes in said mixing chamber, said cavities being in communication in a central region of the mixing chamber located generally between said rotors, said housing means having an inlet with associated means for introducing materials into said mixing chamber to be mixed into a homogeneous mass and having a closable outlet for discharging the mixed materials from said mixing chamber and including drive means for rotating said rotors in opposite directions around their respective axes, a pair of non-intermeshing rotors comprising:
In an internal mixing machine of the batch type, including housing means defining a mixing chamer shaped to accomodate two counter-rotating non-intermeshing winged rotors on parallel horizontal axes in said mixing chamer, said housing means having a closable inlet for introducing materials into the mixing chamber and a closable outlet for discharging the mixed materials from said mixing chamber, a pair of improved non-intermeshing four-wing rotors comprising:
In an internal mixing machine including housing means defining a mixing chamber with respective cavities shaped to accommodate first and second counter-rotating non-intermeshing winged rotors on parallel horizontal axes in said respective cavities, said cavities communicating in a central region of the mixing chamber located generally between said rotors, said mixing chamber having an inlet and an outlet, said machine including drive means for rotating said rotors in opposite directions around their respective axes, wherein said first and second rotors each has a driven end and a coolant end and at least three wings with wing tips of generally helical configuration including first and second long wings and at least one short wing, said first and second non-intermeshing rotors comprising:
Dependencies are inferred from the claim text.