The household oxygen concentrator operates using molecular sieve adsorption and desorption technology. Inside, molecular sieves absorb nitrogen from the air when pressurized, allowing unabsorbed oxygen to be collected and purified into high-purity oxygen. During decompression, the molecular sieve releases the absorbed nitrogen back into the air, and in the next pressurization cycle, it again absorbs nitrogen to produce oxygen. This process continues in a dynamic, cyclic manner, with no consumption of the molecular sieve.