PROBLEM TO BE SOLVED: To solve the problem that when the flow rate of concentrated oxygen gas taken from a take-out port is low, the flow rate becomes unstable.SOLUTION: In the oxygen concentrator of the present invention, control is carried out differently depending on whether the flow rate of concentrated oxygen gas taken from a take-out port is greater than or not greater than a predetermined value. When the flow rate of the concentrated oxygen gas from the take-out port is not greater than the predetermined value, processes for pressure equalization, simultaneous pressurization, pressurization/depressurization, oxygen supply, and purge are carried out before the adsorption cylinder from which the concentrated oxygen gas is supplied to an oxygen tank is switched from a first adsorption cylinder to a second adsorption cylinder.COPYRIGHT: (C)2014,JPO&INPIT【課題】取出口から取り出される酸素濃縮ガスの流量が少ない場合に、その酸素流量が不安定になる。【解決手段】本発明の酸素濃縮装置では、取出口から取り出される酸素濃縮ガスの流量が所定量より多い場合と所定量以下の場合とで、それぞれ異なる制御を行う。取出口から取り出される酸素濃縮ガスの流量が所定流量以下の場合において、第1吸着筒から酸素タンクに酸素濃縮ガスが供給される状態から、第2吸着筒から酸素タンクに酸素濃縮ガスが供給される状態に切り換わるまでの間に、均圧工程と、同時加圧工程と、加圧減圧工程と、酸素供給工程と、パージ工程とが行われる。【選択図】図3(a)
