| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a freezing apparatus constituted to make the inlet quantity of a coolant of an expansion mechanism variable while recovering, to the maximum, energy of a high-pressure coolant as power by the expansion mechanism. <P>SOLUTION: The expansion mechanism 50 is equipped with two rotary mechanism units 70 and 80 having displacements made different from each other. These rotary mechanism units are connected in series, and the rotary mechanism unit of the smaller displacement has two inlet ports 55 and 56 formed in a cylinder 71 thereof. Inlet pipes 24 and 27, as connected to the inlet ports 55 and 56, are equipped with a front throttle valve 60 and a switch valve 61. A bypass pipe 65 for bypassing the expansion mechanism 50 is equipped with a bypass valve 66. These valves 60, 61 and 66 are controlled to attain a balance between the coolant circulation rate of the expansion mechanism 50 and the coolant circulation rate of a compression mechanism 40. <P>COPYRIGHT: (C)2008,JPO&INPIT |
