Rotor-protected evacuation port for centrifugal separation

Details Rotor-protected evacuation port for centrifugal separation Rotor-protected evacuation port for centrifugal separation

1994-07-07

1995-05-16

Scherbel, David A.

Imperforate bowl: centrifugal separators

Including plurality of miniature bowls distrubuted about...

494 61, B04B 502, B04B 1508

Patent

active

054156165

ABSTRACT:
A device for centrifugally separating a sample includes a housing which defines an enclosed chamber from which gas is evacuated via an evacuation port protected by a spinning rotor. The evacuation port is preferably located proximate to the axis of rotation of the rotor and within the interior of the rotor. A drive shaft connects the rotor to a motor positioned outside of the chamber. An annular sleeve having an inside diameter greater than the diameter of the shaft extends coaxially along the drive shaft into the chamber. The outlet of the gap between the drive shaft and the annular sleeve defines the evacuation port. A hub is fixed to the upper end of the drive shaft and includes a downwardly depending skirt that has an inside diameter greater than the outside diameter of the annular sleeve. Gas evacuation from the chamber is initially in an upward direction along the gap between the hub skirt and the sleeve and in a downward direction from the evacuation port to a vacuum pump. Preferably, the vacuum pump is also joined to the drive motor.

REFERENCES:
patent: 2670898 (1954-03-01), Pickels
patent: 3246688 (1966-04-01), Colburn
patent: 3300129 (1967-01-01), Brunati
patent: 3604617 (1971-09-01), Patterson
patent: 4011972 (1977-03-01), Pederson et al.
patent: 4193536 (1980-03-01), Kubota
patent: 4223829 (1980-09-01), Bange
patent: 4435169 (1984-03-01), Romanauskas
patent: 4857811 (1989-08-01), Barrett et al.
patent: 5084133 (1992-01-01), Guy et al.

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