Turbo expander with liquid even-distributing function and refrigerating system

The utility model discloses a turbo expander with the liquid even-distributing function and a refrigerating system, and provides a turbo expander which achieves even liquid supplying of flow ways of an evaporator and can recycle throttling losses in a refrigerating system and the refrigerating system. A liquid supply cavity in the center and an annular distributing cavity in the circumference are formed inside a distributing body of the expander. The annular distributing cavity is divided by partition plates into a plurality of distributing chambers, a liquid distributing pipe is communicated to each distributing chamber, a high-pressure refrigerant supply pipe communicated with the liquid supply cavity is formed in the center of one end face of the distributing body, a rotating shaft is installed inside the liquid supply cavity, and a plurality of rotating impellers are installed at the portion, located inside the liquid supply cavity, of the rotating shaft; an opening facing the liquid supply cavity is formed in the inner side of each distributing chamber; the lengths of the openings in the multiple distributing chambers are equal; the high-pressure refrigerant supply pipe, the rotating shaft, the multiple rotating impellers, the liquid supply cavity and the annular distributing cavity are coaxial. By means of the expander, the heat exchange performance of the evaporator is improved, and the efficiency of the refrigerating system is improved.