| 摘要 |
<p>An oxygen concentration system for generating an oxygen enriched gas, comprising: an oxygen concentration apparatus 102 for generating an oxygen enriched gas; and an ultrasonic apparatus 200 for measuring the concentration of the oxygen in the oxygen enriched gas and flow rate of the oxygen enriched gas, which comprises a conduit 202 for flowing a gas to be measured, the conduit including a straight portion 208 and perpendicular portions 204, 206 perpendicularly connected to the ends of the straight portion 208; first and second ultrasonic transmission-reception devices 218, 222 mounted to the inside of the conduit 202, the second one facing the first one and disposed in the perpendicular portions 204, 206 to face the ends of the straight portion 208; and the distance between devices 218, 222 and the respective ends of the straight portion 208 satisfying a specific relation, wherein the conduit 202 is secured to the oxygen concentration apparatus 102 by means for allowing the longitudinal deformation of the straight portion freely from external force which may be generated when the conduit 202 is thermally deformed.</p> |
