Patent ID: 7491264

Claim:
An oxygen concentrating apparatus, comprising: an oxygen concentrating unit, including an adsorption column filed with an adsorbent material which selectively adsorbs nitrogen gas more than oxygen gas; a compressor for supplying compressed air to the oxygen concentrating unit; a compressor housing for accommodating the compressor, the compressor housing including a plurality of air inlet ports for introducing the air into the compressor housing and an air outlet opening for discharging the air from the compressor housing; a cooling fan mounted on the compressor housing at the air outlet opening for drawing the air from the compressor housing; and the air inlet ports being disposed adjacent the side wall of the compressor to direct the air flow induced by the cooling fan perpendicularly to the side wall of the compressor; characterized in that the capacity of the cooling fan and the diameter of the air inlet ports are selected to ensure the velocity of the air flow through the air inlet ports is equal to or lower than 15 m/sec.