PROBLEM TO BE SOLVED: To provide a device which compensates for an oxygen concentration decrease involved with a time-dependent change in the concentration of generated oxygen and a time-dependent deterioration of a device and keeps the oxygen concentration constant for downtime deterioration of an oxygen enricher.;SOLUTION: The pressure variation adsorption-type oxygen enricher has at least one adsorption bed filled with an adsorbing agent capable of selectively adsorbing nitrogen rather than oxygen, and an air supplying means to supply air to the adsorption bed, a channel switching means to repeat an adsorption process to supply air from the air supplying means to the adsorption bed and extract enriched oxygen, and a desorption process to decompress the adsorption bed and regenerate the adsorbing agent with a fixed timing. The oxygen enricher is equipped with an operating time measuring means 402 and a control means 401 to control the supply amount of air of the air supply means and/or switching time of the channel switching means on the basis of operating time information of the operating time measuring means.;COPYRIGHT: (C)2008,JPO&INPIT
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