Pumps – Motor driven – Magnetostrictive chamber
Patent
1982-12-16
1985-05-28
Look, Edward K.
Pumps
Motor driven
Magnetostrictive chamber
F04B 1700
Patent
active
045197512
ABSTRACT:
A piezoelectric pump includes a hollow cylindrical piezoelectric crystal (12) with end bells (22) and (24) on either end defining a pump chamber (14). A resilient diaphram (32) with an offset orifice (34) provides afferent valving action and a resilient diaphram (44) with an offset orifice (46) provides efferent valving action. Connecting leads (52) and (54) allow a voltage source (56) to be periodically connected to the crystal (12) by a switch (62). A resistor (64) is disposed between one pole of the switch (62) and the connecting lead (54) to allow decay of the charge on the crystal (12). By sensing the voltage on the lead (52) during relaxation of the crystal 12, the internal load can be monitored to provide an indication of the pumping operation. Automatic monitoring is provided by a computer (104).
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Beckman John B.
Blickstein Martin J.
Howison Gregory M.
Look Edward K.
Medlock Nina L.
Mills Jerry W.
The Abet Group
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