Imperforate bowl: centrifugal separators – Including plurality of miniature bowls distrubuted about...
Patent
1987-10-09
1988-11-01
Simone, Timothy F.
Imperforate bowl: centrifugal separators
Including plurality of miniature bowls distrubuted about...
156172, 156175, 494 81, B04B 100, B04B 708
Patent
active
047816694
ABSTRACT:
A composite material centrifuge rotor and process of construction of the rotor is disclosed. A rotor having high stiffness of fibers, preferably carbon, bound together with resin is disclosed. The rotor includes a top disk, a bottom disk and a spacer belt spacing the two disks apart to form a rotor assembly. The top and bottom disks are fabricated by overlying multiple layers of tape, the tape being made from longitudinally extending and parallel fibers held together with resin. The tapes are stacked in multiple layers normal to the spin axis of the rotor so as to lie within the plane of the centrifugal force exerted by the rotor. Successive layers of tape are oriented so as to vary the longitudinal direction of the fiber with respect to a preselected radius vector from the spin axis of the rotor. When the tape is compiled in multiple layers to a thickness of the top and bottom disk, the tape is compressed between two metal plates and cured at a temperature well above the expected autoclave temperature of sterilization of the rotor. Thereafter, a spacer belt consisting of a spirally wound resin impregnated and cured fiber is placed to space the top and bottom disks apart. Thereafter, the entire assembly is wound by a peripheral belt with resin impregnated high stiffness fiber. This fiber is cured and shrinks during curing to exert hoop tension around the periphery of the rotor assembly. This hoop tension in turn radially prestresses the rotor equal and opposite to the radial tension forces of centrifugal force when the rotor is in use.
A hub having a mount only to the lower plate is disclosed which effective cantilevers the rotor on the centrifuge spindle. A system of balancing inserts and interchangeable inserted buckets enables final balance of the rotor for the centrifuging of samples.
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patent: 2974684 (1961-03-01), Ginaven et al.
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patent: 3993243 (1976-11-01), Dietzel et al.
patent: 3997106 (1976-12-01), Baram
patent: 4160521 (1979-07-01), Lindren
patent: 4468269 (1984-08-01), Carey
Beckman Instruments Inc.
Harder Paul R.
May William H.
Simone Timothy F.
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