The structure of automatic cascade refrigeration system is simple

and the operation is reliable. Since the non-azeotropic mixed refrigerants are used

whether the condensing separation is complete or not will directly affect the cooling efficiency. A new type of multistage condensing filtration disengaging gear is proposed in the paper. A test-bed of automatic cascade refrigeration system equipping with the device is set up for actual application research. The results show that the device can separate high and low boiling point group efficiently. Because of its simple structure and low cost

the device may have important potential of practical application.