Portable oxygen concentrator

A portable oxygen concentrator, comprising at least one separation mechanism, wherein

• the at least one separation mechanism comprises an air bag having an inner space, and a molecular sieve tank filled with a molecular sieve for adsorption;
• the inner space is compressible and expandable;
• the air bag has an air inlet and an air outlet;
• the air inlet of the air bag is provided with a one-way valve;
• the air bag is connected to the molecular sieve tank through a valve group;
• the valve group comprises a first single valve and a second single valve;
• the first single valve is a one-way pressure valve, and the second single valve is a normally-open valve;
• the air outlet of the air bag is connected to the molecular sieve tank through the first single valve;
• two ends of the molecular sieve tank each have at least one gas outlet for discharging a separated gas;
• the gas outlet at one end of the molecular sieve tank connected to the air bag is provided with the second single valve linked with the first single valve;
• and when the first single valve is opened and closed, the second single valve is closed and opened under linkage;
• and
• the inner space of the air bag is compressed and expanded once to form a working cycle, and the molecular sieve in the molecular sieve tank adsorbs and desorbs once to form a working cycle;
• during a compression process of the inner space of the air bag, when a pressure in the air bag increases to a set pressure value, the first single valve is opened, the second single valve is closed, and the molecular sieve in the molecular sieve tank starts an adsorption process;
• and during an expansion process of the inner space of the air bag, the first single valve is closed, the second single valve is opened, and the molecular sieve in the molecular sieve tank starts a desorption process.