To make an inquiry into the internal and external mixing aerodynamics, research was made on this kind of mixer-ejector system by a series of experiments and computations.

The solar ejector refrigerant system, at the same time when it makes full use of solar energy, because of its simple structure and stable, reliable operation, has gained much attention.

Base on the main problem of vacuum ejector waste system, this paper set out overhaul flow chart and raise check and overhaul method.