Fluid pump having expansion device and rankine cycle using the same

A complex fluid machine which is applied to a Rankine cycle having a heat generating source, the fluid machine comprising:

• an expansion device for generating rotational driving force by expanding working fluid;
• a pump for circulating the working fluid to supply the same into the expansion device, wherein the working fluid is heated by heat from the heat generating source before being supplied to the expansion device;
• and
• a generator for generating an electric power when the generator is rotated by the driving force generated at the expansion device, wherein the complex fluid machine further comprises;
• a housing for housing therein the expansion device, the generator, and the pump;
• a partitioning wall for dividing a space defined by the housing into a first space for the expansion device and the generator, and a second space for the pump;
• a low pressure port provided at the housing, wherein the low pressure port is in communication with an inside of the first space;
• an outlet side passage formed in the first space, through which the working fluid from the expansion device flows to the low pressure port;
• an outlet opening provided at the housing, wherein the outlet opening is in communication with an inside of the second space;
• and
• a pump outlet-side passage formed in the second space, through which the working fluid from the pump flows to the outlet opening,
• wherein the outlet side passage formed in the first space and the pump outlet-side passage are respectively formed at each side of the partitioning wall, so that heat of the working fluid in the outlet side passage formed in the first space is transferred to the working fluid in the pump outlet-side passage via the partitioning wall to increase the temperature of the working fluid in the pump outlet-side passage.