Pumps – Motor driven – Common pump and motor chamber
Patent
1976-11-19
1982-11-23
Smith, Leonard E.
Pumps
Motor driven
Common pump and motor chamber
417429, 417518, 417539, 91 40, 137 99, F04D 1700, F04D 2306
Patent
active
043603238
ABSTRACT:
A compact and highly reliable proportioning pumping system for supplying a precise and controllable mixture of concentrate and water in a kidney dialysis machine comprises a central body and a pair of oppositely mounted pivotable linkages coupled to the body. A first pivotable linkage is coupled by connecting rods to a water metering piston and a concentrate metering piston respectively, a variable stroke ratio being provided by a signal actuated drive coupled to the linkage mechanism and controlling the relative position of the end of one of the connecting rods. The change of position is advantageously effected so as to maintain a precise proportionality between the flows delivered by each of the pistons throughout their variable stroke lengths. The range of proportioning adjustments can be mechanically limited and alarm conditions can readily be detected. Precise delivery of surge-free flows of liquid for subsequent mixing is enhanced by controlling flow through each piston with a fast-acting metering valve system. A bistable switching valve responsive to the limit positions of the first linkage mechanism controls an actuator piston to operate a second pivotable linkage mechanism to which the metering valves are coupled. The second linkage switches rapidly between two alternate valve positions, so that there is a minimum dead zone and both water and concentrate flows are precisely controlled.
REFERENCES:
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patent: 3556679 (1971-01-01), Middlebusher et al.
patent: 3598727 (1971-08-01), Willock
patent: 3737073 (1973-06-01), Lupert
patent: 3815621 (1974-06-01), Robinson
patent: 3888552 (1975-06-01), Fontaine
Fischel Halbert
Smith Leonard E.
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