An oxygen concentration device is provided which, when the number of revolutions of a compressor reaches an upper limit of control, increases an oxygen concentration, and can extend an operating time of the oxygen concentration device, comprising a control means which controls the number of revolutions of the compressor based on a detected value of an oxygen concentration sensor, judges deterioration due to moisture absorption based on the detected value of the oxygen concentration sensor, a detected value of a pressure sensor, and an operating time of an adsorption cylinder and, when criteria for judgment of the deterioration due to moisture absorption are satisfied, makes a purge step time shorter than an initially set time.本發明係提供一種氧濃縮裝置,該裝置係當壓縮機旋轉數調控之上限到達時,則使氧濃度提升以使氧濃縮裝置之使用時間可延長,其特徵係具備一調控手段,其基於氧濃度偵測器之偵測值調控該壓縮機旋轉數,同時基於該氧濃度偵測器之偵測值、該壓力偵測器之偵測值及該吸附筒之使用時間判斷吸濕劣化,並在滿足吸濕劣化之判斷基準時將該清除步驟之時間縮短至較初始設定時間短。
