PURPOSE: To prevent the outflow quantity of a liquid refrigerant from a refrigerant pump from being reduced by forming a suction port and a discharge port communicated to the compression chamber of a cylinder across a vane groove respectively.

CONSTITUTION: A suction port 14 and a discharge port 15 communicated to the compression chamber 13 of the cylinder 16 of a sealed rotary refrigerant pump 30 are formed across a vane groove 19. A suction hole 23 communicated to the suction port 14 and a discharge hole 24 communicated to the discharge port 15 are formed on bearings 21 and 22. The discharge liquid refrigerant discharged through the discharge hole 24 flows through a discharge pipe 32 without colliding with the inner wall of an end shell 31 and flows into the discharge pipe through a guide pipe 33 without causing a turbulent state. The passage resistance is not increased, and the outflow quantity of the liquid refrigerant from the refrigerant pump is not reduced.