Patent ID: 9556029
Date: 2017-01-31
CPC Classifications: B01D,C01B,F25J

Claim:
1. A method of controlling a system for producing liquid oxygen, wherein the system includes an oxygen concentration subsystem and a liquefaction subsystem, the method comprising: determining whether the liquefaction subsystem is active; producing, by the oxygen concentration subsystem, oxygen-enriched gas; providing the oxygen-enriched gas to a user, through a patient valve that fluidly communicates between the oxygen concentration subsystem and the user; providing the oxygen-enriched gas to the liquefaction subsystem, through a liquefaction valve that fluidly communicates between the oxygen concentration subsystem and the liquefaction subsystem; condensing, by the liquefaction subsystem, the oxygen-enriched gas to produce a liquid product; measuring a flow rate from the oxygen concentration subsystem to the liquefaction subsystem, wherein the oxygen concentration subsystem operates based on a cycle timing, wherein the cycle timing includes a feed cycle and a purge cycle; comparing the measured flow rate from the oxygen concentration subsystem to the liquefaction subsystem to a flow rate setpoint; and responsive to a determination that the liquefaction subsystem is active and further responsive to measuring the flow rate from the oxygen concentration subsystem to the liquefaction subsystem, adjusting the cycle timing of the oxygen concentration subsystem based on the measured flow rate from the oxygen concentration. subsystem to the liquefaction subsystem and the comparison of the measured flow rate from the oxygen concentration subsystem to the liquefaction subsystem to the flow rate set point, wherein the adjusting of the cycle timing includes adjusting a duration of a next subsequent feed cycle relative to a duration of an immediately previous feed cycle by a predetermined interval of time.