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REFRIGERATING APPARATUS AND CONTROL DEVICE FOR REFRIGERATING MACHINE

  • US 20140260388A1
  • Filed: 03/14/2014
  • Published: 09/18/2014
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A refrigerating apparatus comprising:

  • a centrifugal compressor;

    a suction capacity control mechanism and a discharge capacity control mechanism configured to control a capacity of the compressor by changing opening degrees of the suction capacity control mechanism and the discharge capacity control mechanism; and

    a controller configured to compare a compressor-specific surge curve with an isentropic head to performrotational speed control of the compressor,rotational speed adjustment control of the compressor in order to avoid surge, andemergency shutdown control of the compressor upon detection of surge,the compressor-specific surge curve being stored in the controller in advance, and the compressor-specific surge curve being defined by an actual rotational speed of the compressor, an opening degree of the suction capacity control mechanism, and an opening degree of the discharge capacity control mechanism, andthe isentropic head being calculated based on a suction pressure, a discharge pressure, and a suction temperature during operation.

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