Portable oxygen concentrator

A portable oxygen concentrator for generating a product gas of a predetermined oxygen concentration and delivering it to a user at a relatively high flowrate comprising:

• an electrically energized compressor for receiving filtered air from the atmosphere and compressing it to a low pounds per square inch pressure,
• a heat exchanger for receiving a compressed air product from said compressor for cooling it to a predetermined temperature,
• a gross particle filter means for receiving the cooled compressed air product and transmitting it to a solenoid valve,
• a solenoid valve comprising a plurality of valve means for receiving said cooled compressed air product from said filter means,
• a plurality of molecular sieve beds for receiving said cooled compressed air product from said filter means for selectively adsorbing nitrogen therefrom to increase the oxygen concentration of the oxygen enriched compressed air product recovered therefrom,
• said solenoid valve comprises valving means for selectively directing a portion of said cooled compressed air product from said filter means to one of a plurality of sieve beds for increasing the oxygen content of said portion of said cooled compressed air product to form said enriched compressed air and the remainder of said cooled compressed air being directed through the remainder of said sieve beds to purge them of at least a part of their nitrogen adsorption,
• a reservoir for receiving said enriched compressed air product from said one of said sieve beds,
• flow control means for withdrawing said enriched compressed air product from said reservoir,
• said control means comprises a venturi tube for receiving said enriched compressed air product therethrough, blending it with a predetermined amount of atmospheric air connecting said venturi tube with a user, and
• electrical control means for selectively operating said compressor and said solenoid valve.