PATENT NUMBERS: 5,511,955 and 4,239,460
ISSUE DATE: 04/30/96
INVENTORS: Robert Crowl, Bruce Brown, Phil Westermann
ASSIGNEE: Cryogenic Group, Inc. Murrieta, CA
FILING DATE: 02/07/95
SERIAL NUMBER; 384970
IPC EDITION: (6)
IPC CLASS: F04B 15/08
U.S. CLASS: 417-259
NUMBER OF CLAIMS: 25
A cryogenic pump capable of operating with a sub-zero net positive suction head includes a reciprocating piston positioned in a cylindrical housing for dividing the interior of the housing into a supercharger chamber and an evacuation chamber on opposite sides of the piston. A supercharger chamber valve, positioned directly behind the reciprocating piston, controls the flow of liquified gas from a gas inlet into the supercharger chamber. A fixed piston, extending into the evacuation chamber, engages a cylindrical skirt carried by the reciprocating piston to form a high pressure chamber between the two pistons. Liquified case from the high pressure chamber is supplied to a gas outlet via a passageway in the fixed piston.
PATENT NUMBER: 5,242,285
INVENTORS: Phil Westermann, Jr.
ASSIGNEE: ACD, Inc. Santa Ana, CA
FILING DATE: 12/12/89
SERIAL NUMBER; 449,535
IPC CLASS: F04B 15/08
U.S. CLASS: 418-111
NUMBER OF CLAIMS: 12
A vane pump for pumping cryogenic liquids, the vane pump
comprising:
a stator housing having an inner surface which defines a stator
chamber including two end plates disposed at opposite ends of the
stator chamber, the stator housing further having fluid inlet and
outlet ports into the chamber.
a rotor rotatably mounted within the chamber for rotation about a
rotor axis which is substantially perpendicular to the end
plates, the rotor having a plurality of slots each of which is
adapted to slidably receive a vane;
a plurality of vanes, each vane mounted into one slot of the
rotor and each vane comprising a plurality of vane plates, each
plate positioned in the slot substantially parallel with the
other plate and the plates being adjacent to one another and
collectively substantially filling the slot, each plate of each
vane comprising at least two parts disposed in substantially
adjacent relationship to one another, biasing means mounted to
each plate of each vane for biasing the parts of each plate away
from one another in a direction substantially parallel with the
rotational axis of the rotor and into contact with the end plates
whereby the biasing means causes the vanes to seal against the
end plates, and whereby during rotation of the rotor, pressure
differential on two sides of each vane causes the plates of each
vane to be pressed towards one another; and the inner surface of
the stator housing which comes into contact with the vanes while
the vanes are traveling under a pumping load of cryogenic liquid
comprising a first surface of substantially circular curvature
extending between said inlet port and said outlet port with the
center of the curvature of said surface being substantially
coincident with the center of rotation of the rotor, whereby
under a pumping load each vane travels only in a substantially
circular arc so that the vanes do not move substantially within
the rotor slots.
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