Patent ID: 9011582
Filing Date: 2015-04-21
Classification: A61M,B01D

Abstract:
1. A pressure swing adsorption-type oxygen enrichment device comprising: first and second adsorption cylinders filled with an adsorbent which selectively adsorbs nitrogen relative to oxygen thereby producing an oxygen-enriched gas; a compressor configured to supply raw material air to the first and second adsorption-cylinders; a flow-channel switching means for switching flow channels between the compressor and the first and second adsorption cylinders and for repeating an adsorption step, a desorption step, a pressure equalization step and a purge step in a specific timing; a flow setting means for supplying the oxygen-enriched gas to a user at a specific flow rate; an oxygen concentration sensor configured to detect an oxygen concentration of the oxygen-enriched gas; a temperature sensor configured to measure a temperature of the device; and a purge step control means for controlling a length of the purge step so as to maximize the oxygen concentration by changing opening/closing timing of the flow-channel switching means, when an output value of the oxygen concentration sensor is lower than a specified value, or the output value of the temperature sensor is out of a specific temperature range, wherein the oxygen enrichment device is configured to perform the following steps: the adsorption step for supplying compressed air to the first and second adsorption cylinders selectively and extracting an oxygen-enriched gas by sequentially switching the flow channels; the desorption step for depressurizing the first and second adsorption cylinders selectively and regenerating the adsorbent; the pressure equalizing step for communicating the first and second adsorption cylinders; and the purge step for introducing highly concentrated oxygen from the first adsorption cylinder in the adsorption step into the second adsorption cylinder in the desorption step.