Pumps – Processes
Patent
1998-10-02
2000-08-22
Yuen, Henry C.
Pumps
Processes
417216, F04B 1924
Patent
active
061062383
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.
REFERENCES:
patent: 4624625 (1986-11-01), Schrenker
patent: 4883409 (1989-11-01), Strohmeier et al.
patent: 4919595 (1990-04-01), Linkuski et al.
patent: 5393434 (1995-02-01), Hutchins et al.
patent: 5823747 (1998-10-01), Ciavarini et al.
Ciavarini Steven J.
Dumas Robert J.
Gimie Mahmoud M
Janiuk Anthony J.
Michaelis Brian
Water Investments Limited
Yuen Henry C.
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