Patent ID: 8377180

Claim:
An pressure swing adsorption-type oxygen concentrator provided with an adsorption bed filled with an adsorbent, which selectively adsorbs nitrogen relative to oxygen, and a compressed air supply device, which supplies compressed air to the adsorption bed, to adsorb and eliminate nitrogen in raw material air to produce unadsorbed oxygen and to supply an oxygen gas at a predetermined flow rate by a flow rate setting device, comprising: an oxygen concentration sensor, which detects a concentration of an oxygen gas produced by the oxygen concentrator, a temperature sensor, which measures an environmental temperature, a control device, which performs control by increasing or decreasing a supply airflow volume of the compressed air supply device based on a detected oxygen concentration value to maintain an oxygen concentration at a predetermined concentration, wherein the control device controls a supply airflow volume of the compressed air supply device based on a value detected by the temperature sensor when the value detected by the temperature sensor being outside a predetermined threshold, wherein the control device is a control device, which performs control without allowing the supply airflow volume of the compressed air supply device to decrease when the temperature sensor detects a value lower than a predetermined lower temperature limit of the threshold during running of the oxygen concentrator.