Liquid injection type compressor or expander component

The utility model relates to liquid injection type compressor component or expander component with the casing, the casing includes the rotor chamber, and at least one rotor rotatably attaches and connects in the rotor chamber, wherein, the component still is provided with the connecting portion that are used for pouring into into the return circuit to pour into liquid into in the component, wherein, be connected to opening that the connecting portion that pour into the return circuit into pass through the casing and realize to the injection location of first compression chamber or expansion chamber, wherein, be connected to the additionally opening through the casing to the extra injection location realization of second or follow -up compression chamber or expansion chamber of connecting portion of pouring into the return circuit into. Through the utility model discloses, liquid is poured into into follow -up compression chamber or expansion chamber for can also provide required sealed and lubrication at foll