Vacuum pressure swing adsorber for VPSA oxygen generator

A vacuum pressure swing adsorber for a VPSA oxygen generator comprises an adsorption tower, the adsorption tower is connected with an air buffer tank and a vacuum pump, a nitrogen and oxygen screening layer is arranged in the adsorption tower, an upper end opening and a lower end opening are formed in the two sides of the nitrogen and oxygen screening layer respectively, an airflow diffuser is further arranged in the adsorption tower, and the airflow diffuser is connected with the air buffer tank. The airflow diffuser comprises a plurality of layers of splitter plates which are arranged at intervals, overflowing holes are formed in the layered splitter plates, the overflowing holes in every two adjacent splitter plates are formed in a staggered mode, and the edges of the splitter plates are distributed in a normal curve mode in the radial direction of the adsorption tower; the airflow diffuser adjusts airflow at the air inlet in a normal distribution mode, the number of layers of splitter plates at the air in