Gas-liquid separator and refrigerating system and heat pump system

The invention discloses a gas-liquid separator. A helical pipe is arranged in a housing of the separator, the lower end of the helical pipe extends out of the housing of the separator, the upper end of the helical pipe is opened, and the outer side of the pipe wall of the helical pipe is provided with liquid phase holes. The gas-liquid separator is assembled at the front end of an evaporator and adopts the helical pipe screwing from bottom to top by adopting a double-layer inner barrel, and limit on the flow speed of a conventional gas-liquid separator is overcome. Meanwhile, the gas-liquid separator has the advantages of simple structure, good separation effect and the like.