Abstract: An overheating detection unit is attached between an oxygen concentrator and a cannula, making it possible to reliably detect a high-temperature environment to cut the supply of oxygen when a user inhales oxygen using the cannula and is exposed to a fire or an abnormal high-temperature environment. An overheating detection unit includes a main body including a connecting member connected to an oxygen outlet and an oxygen outlet portion connected to a tube and also includes a housing covering the main body. The main body includes a temperature sensor in the oxygen outlet portion to detect the temperature of the oxygen outlet portion and a blocking structure portion that blocks a passage between the connecting member and the oxygen outlet portion to cut the supply of oxygen when the temperature sensor detects a temperature equal to or higher than a predetermined temperature.

Abstract: To provide an oxygen concentrator that can ensure safety by interrupting oxygen in a case where the oxygen concentrator is exposed to fire or an abnormal high-temperature environment when a user thereof is inhaling oxygen with a cannula. The oxygen concentrator includes: a compressor separating compressed air by compressing raw air; an oxygen outlet for discharging oxygen acquired from the compressed air; a coupler mounted on a tube of a cannula and removably connecting the tube to the oxygen outlet, and moreover having a temperature sensor; and a control unit stopping operation of the compressor to interrupt the supply of oxygen when a temperature sensed by the temperature sensor reaches a predetermined temperature or higher.