Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control
Patent
1996-05-29
1998-10-20
Freay, Charles G.
Pumps
Condition responsive control of drive transmission or pump...
Plural pumps with individual or relative control
210101, B01D 1508
Patent
active
058237470
ABSTRACT:
A serial, dual piston high pressure fluid pumping system that overcomes the difficulties of gas in the fluid stream without the need for added mechanical valves or fluid paths. A bubble detection and recovery mechanism monitors compression and decompression volumes of the serially configured dual pump head pump, and the overall system delivery pressure. Bubble detection is effected by sensing a ratio of compression to decompression volume and determining if the ratio exceeds an empirical threshold that suggests the ratio of gas-to-liquid content of eluent or fluid in the system is beyond the pump's ability to accurately meter a solvent mixture. The magnitude of the ratio of compression to decompression volume indicates that either the intake stroke has a bubble or that the eluent has a higher-than-normal gas content. Once a bubble has been detected, recovery is effected by forcing the pump into a very high stroke volume with the compression and decompression stroke limits constrained to obtain the largest delivery stroke compression ratio that will expel a bubble or solvent that has detrimental quantities of gas.
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Ciavarini Steven J.
Dumas Robert J.
Freay Charles G.
Janiuk Anthony J.
Kim Ted
Michaelis Brian L.
Waters Investments Limited
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