Using molecular sieve pressure swing adsorption principle. After the air source is pressurized by the compressor and the pretreatment system removes solid impurities such as oil, dust and most of the gaseous water, it enters the adsorption tower equipped with zeolite molecular sieve, and the nitrogen, carbon dioxide, and water vapor in the air are selectively adsorbed by the adsorbent , Oxygen passes through the adsorption tower, and oxygen is output as product gas; if the atomization function is required, the compressed gas is used as the driving source to generate and transmit the mist. When the compressed air generated by the compressor is ejected from the nozzle, it passes through The negative pressure generated between the nozzle and the suction pipe causes the liquid medicine to be sucked upwards. The inhaled liquid medicine hits the upper diaphragm and sprays out into a very fine mist.