PROBLEM TO BE SOLVED: To provide an oxygen concentrator capable of not only measuring accurately oxygen concentration but also attempting to perform miniaturization and weight reduction.SOLUTION: The oxygen concentrator of a respiration syntonic type includes: an air intake part an air compressing part a PSA part an oxygen storing part an oxygen supplying part and an oxygen concentration detecting part. In the oxygen concentrator, in a period when a high concentration oxygen is not discharged from the oxygen supplying part, generation of the high concentration oxygen in the PSA part is temporarily stopped, to hold the pressure in the oxygen storing part constant (by the PSA controlling part). When the pressure in the oxygen storing part is held constant by the PSA controlling part, the concentration of the high concentration oxygen is detected by the oxygen concentration detecting part.COPYRIGHT: (C)2012,JPO&INPIT【課題】酸素濃度を正確に計測できるとともに、小型化・軽量化を図ることができる酸素濃縮器を提供する。【解決手段】空気取入部、空気圧縮部、PSA部、酸素貯留部、酸素供給部、及び酸素濃度検出部を備えた呼吸同調式の酸素濃縮器において、酸素供給部から高濃度酸素が放出されていない期間に、PSA部における高濃度酸素の生成を一時的に停止させ、酸素貯留部における圧力を一定に保持する(PSA制御部)。そして、PSA制御部により酸素貯留部の圧力が一定に保持されているときに、酸素濃度検出部が高濃度酸素の濃度を検出する。【選択図】図7
