| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a turbo freezing machine that ensures both efficiency and control stability, and is excellent in responsiveness and easy to use. <P>SOLUTION: The turbo freezing machine includes a vaporizer 10 which generates a refrigerant gas by vaporizing a refrigerant liquid to cool a medium to be cooled with latent heat of vaporization, an impeller 23 which sucks and compresses the refrigerant gas; a turbo compressor 20 which is provided to an entrance of the impeller 23 and has a guide vane 25 whose opening is variable, a condenser 30 which absorbs heat from the refrigerant gas compressed by the turbo compressor 20 and condenses the refrigerant gas, a variable speed driving machine 21 which drives the turbo compressor 20, a first control part 71 which controls a freezing capacity by controlling the rotating speed of the variable speed driving machine 21 according to a freezing load processed by the vaporizer 10, and a second control part 72 which controls the rotating speed of the variable speed driving machine 21 to a predetermined set rotating speed SETSP by controlling the opening of the guide vane 25. <P>COPYRIGHT: (C)2012,JPO&INPIT |
