Patent ID: 7758672

Claim:
An apparatus for concentrating oxygen comprising: an adsorption bed having a first solenoid valve mounted on the outside of a bed housing to supply and/or discharge compressed air; first and second adsorption columns disposed in the adsorption bed to separate nitrogen and oxygen in the compressed air supplied through the first solenoid valve; an oxygen reservoir to store the oxygen concentrated by the first and second adsorption columns; first and second cover assemblies mounted on first and second terminal ends of the adsorption bed; respectively, wherein the first cover assembly includes first and second grooves which are spaced from each other and positioned to correspond to the first and second adsorption columns on the inside surface of the first cover assembly; first and second check valves disposed at the first cover assembly in areas having the first and second grooves, respectively, for allowing the concentrated oxygen to flow through a supplying hole which is disposed in the first cover assembly and communicates with the oxygen reservoir of the adsorption bed; a mounting part incorporated on an upper part of the first cover assembly, the mounting part having first and second communicating holes, first ends of the communicating holes being in fluid communication with the inside of the first and second grooves, respectively, and second ends of the communicating holes extending to the outside of the first cover assembly, respectively; a second solenoid valve mounted on the mounting part and being in fluid communication with the first and second communicating holes so as to obtain an equilibrium in the pressure of the first and second adsorption columns; and a chamber installed on the outside of the first cover assembly such that the gas supplied through the first and second check valves can flow to the supplying hole.