What is the principle of oxygen machine? Which is better?

The domestic oxygen-making machine of oxygen cooler adopts the high-efficiency molecular sieve technology imported from Switzerland, and purifies, separates, screens and humidifies the air through the physical oxygen-making principle of PSA pressure swing adsorption, and finally obtains high-concentration fresh oxygen, and the oxygen concentration can be freely adjusted between 30% and 90%. This technology has won a number of national and international patents, and passed the relevant testing certification of authoritative organizations at home and abroad. What is the principle of oxygen machine? From official website, who is the deaerator?