Fluid machine and rankine cycle

Abstract

A fluid machine includes: a first shaft; a compressor/expander fluid machine; a planetary gear mechanism having a sun gear connected to a second shaft rotating in synchronization with the compressor/expander fluid machine, a ring gear connected to the first shaft, a planetary gear, and a planetary carrier; a first clutch that locks/releases the planetary carrier and one of the ring gear and the sun gear; a second clutch that locks/releases the planetary carrier and the housing; a clutch control unit that controls locking/releasing of the first and second clutches depending on whether the compressor/expander fluid machine operates as an expander or a compressor.

1 .- 8 . (canceled) 
     
     
         9 . A fluid machine comprising:
 a first shaft configured to rotate in synchronization with an engine crankshaft;   a compressor/expander fluid machine configured to operate as an expander rotating by converting energy of a refrigerant into mechanical energy in rotation of one direction, and operate as a compressor by compressing and discharging the refrigerant in rotation of the other direction;   a planetary gear mechanism having
 a sun gear connected to the second shaft rotating in synchronization with the compressor/expander fluid machine, 
 a ring gear connected to the first shaft, 
 a plurality of planetary gears configured to mesh with the ring gear and the sun gear and rotate around the sun gear, and 
 a planetary carrier configured to support a rotation shaft of the planetary gear; 
   a first clutch configured to lock or release the planetary carrier and one of the ring gear and the sun gear;   a second clutch configured to lock or release the planetary carrier and a housing; and   a clutch control unit configured to control locking/releasing of the first and second clutches depending on whether the compressor/expander fluid machine operates as an expander or a compressor.   
     
     
         10 . The fluid machine according to  claim 9 , wherein the clutch control unit is configured to lock the first clutch and release the second clutch when the compressor/expander fluid machine operates as the expander. 
     
     
         11 . The fluid machine according to  claim 9 , wherein the clutch control unit is configured to release the first clutch and lock the second clutch when the compressor/expander fluid machine operates as the compressor. 
     
     
         12 . The fluid machine according to  claim 9 , wherein a ratio of the number of teeth between the ring gear and the sun gear is set to 1.5 to 4. 
     
     
         13 . The fluid machine according to  claim 9 , wherein the ratio of the number of teeth between the ring gear and the sun gear is set to a value corresponding to a ratio between a refrigerant volume flow rate necessary in the expander when the compressor/expander fluid machine operates as the expander and a refrigerant volume flow rate necessary in the compressor when the compressor/expander fluid machine operates as the compressor. 
     
     
         14 . The fluid machine according to  claim 9 , wherein the first clutch is a freewheel clutch configured to fix the planetary carrier and one of the ring gear and the sun gear when the compressor/expander fluid machine operates as an expander. 
     
     
         15 . A Rankine cycle comprising:
 the fluid machine according to  claim 9 ;   a refrigerant pump configured to supply a liquid refrigerant;   a vaporizer configured to heat and vaporize the liquid refrigerant supplied from the refrigerant pump;   an expander configured to rotate by converting energy of the refrigerant vaporized by the vaporizer into mechanical energy; and   a condenser configured to condense the refrigerant discharged from the expander to return the refrigerant to a liquid refrigerant,   wherein the refrigerant pump is configured to be driven by the rotation shaft of the planetary carrier of the fluid machine, and   the expander is the compressor/expander fluid machine of the fluid machine.   
     
     
         16 . A fluid machine comprising:
 a pump/motor fluid machine configured to be rotatable forwardly and reversely and operate as a motor rotating by converting energy of a refrigerant into mechanical energy in rotation of one direction and operate as a pump compressing and discharging the refrigerant in rotation of the other direction;   a transmission mechanism configured to transmit rotation of the pump/motor fluid machine to an engine crankshaft rotating in one direction such that a rotational direction of the pump/motor fluid machine is the same as that of the crankshaft when the pump/motor fluid machine is used as a motor, and the rotational direction of the pump/motor fluid machine is reverse to that of the crankshaft, and a rotational speed of the pump/motor fluid machine is higher than that of the engine crankshaft in the motor operation when the pump/motor fluid machine is used as a pump; and   a plurality of clutches configured to be able to switch whether the transmission mechanism transmits the rotation of the pump/motor fluid machine in the same rotational direction as that of the crankshaft or reversely to that of the crankshaft.