Turbovacuum pumps use the rotation of the turbine to extract gas. A limited working chamber is formed between the turbine and the pump chamber. When the turbine rotates, the gas in the working chamber is discharged and new gas is sucked in. Molecular sieve adsorption vacuum pump utilizes the adsorption effect of molecular sieve on gas to achieve suction. Molecular sieves have a highly porous structure and can selectively adsorb gas molecules. When the molecular sieve is saturated with adsorption, it is released by heating to restore its adsorption capacity.