Rotary expansible chamber devices – Plural working chambers – Axially spaced working chambers
Reexamination Certificate
2006-06-13
2006-06-13
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
Plural working chambers
Axially spaced working chambers
C418S258000, C418S148000
Reexamination Certificate
active
07059843
ABSTRACT:
An improved vane for axial vane rotary devices such as pumps, compressors and expanders comprising at a pair of axially movable inner housing seal pieces defining and upper camming surface and a lower edge. The vanes are provided with spaces for receiving the seal pieces and the spaces have at least one edge corresponding to the camming surface of the seal piece. In one embodiment a median portion of a single piece vane is cut away to define a space in which the seal pieces are received. In another embodiment the vane is divided into two axially slidable sections and a corner portion of each section is cut away to provide a space for receiving a seal piece. During operation the seal pieces are cammed radially downward during axial movement to bring the lower edge of the seal piece into contact with the inner housing of the device rotor to improve sealing and reduce leakage of pressurized fluid between the vane and the inner housing.
REFERENCES:
patent: 1940384 (1933-12-01), Zoller
patent: 2154458 (1939-04-01), Knapp
patent: 3437079 (1969-04-01), Odawara
patent: 4439117 (1984-03-01), Bunger
patent: 5224850 (1993-07-01), Pie
patent: 1315068 (1963-01-01), None
Advanced Technologies, Inc.
Stites & Harbison PLLC
Trieu Theresa
Vanderburgh John E.
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