Oxygen enrichment device of the pressure change adsorption type comprising: a plurality of adsorption cylinders (131, 132) filled with an adsorbent that selectively adsorbs nitrogen in relation to oxygen； a compressor (112) for supplying air as a starting material to the adsorption cylinders； means for performing an adsorption stage to supply compressed air to each of the adsorption cylinders and extracting an oxygen enriched gas by sequentially switching flow channels between the compressor and each of the adsorption cylinders； means for performing a desorption stage to depressurize each of the adsorption cylinders and regenerate the adsorbent； means for performing a pressure equalization stage (125) for communicating each of the adsorption cylinders； flow channel switching means (121, 122, 123, 124) to repeat the purge stage in a specific synchronization, in which highly concentrated oxygen is introduced from the adsorption cylinder into the adsorption stage in the adsorption cylinder in the desorption stage； a flow adjustment means (142) for supplying the oxygen enriched gas to a user at a specific flow rate； an oxygen concentration sensor (144) for detecting the oxygen concentration of the oxygen enriched gas produced by the oxygen enrichment device； a temperature sensor to measure the temperature of the device； characterized by a purge stage control means that controls the duration of an output stage and purge stage to maximize oxygen concentration by changing the opening / closing timing of the flow channel switching means (121-124 ) when the output value of the oxygen concentration sensor (144) is less than a specified value, or the output value of the temperature sensor is outside a specific temperature range.Dispositivo de enriquecimiento en oxígeno de tipo adsorción por cambio de presión que comprende: una pluralidad de cilindros de adsorción (131, 132) llenos con un adsorbente que adsorbe selectivamente nitrógeno en relación con oxígeno； un compresor (112
