Refrigeration – Automatic control – Refrigeration producer
Reexamination Certificate
2008-01-30
2011-10-18
Jiang, Chen Wen (Department: 3784)
Refrigeration
Automatic control
Refrigeration producer
C062S228300, C062S510000, C417S044200
Reexamination Certificate
active
08037702
ABSTRACT:
To provide a multistage compressor including an injection circuit, which can continue high-efficiency and high-capacity operations even if the injection circuit is turned on/off in accordance with operating conditions. A multistage compressor includes a high stage side compressing mechanism suctioning the intermediate pressure refrigerant gas compressed with a low stage side compressing mechanism to perform two-stage compression, and an injection circuit for injecting an intermediate pressure refrigerant into the intermediate pressure refrigerant gas suctioned to the high stage side compressing mechanism, the high stage side compressing mechanism including a capacity control mechanism for bypassing a refrigerant gas that is being compressed to a suction side, the injection circuit including an on/off mechanism for performing on/off control of refrigerant injection, and the capacity control mechanism and the on/off mechanism being operated in conjunction with each other.
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European Search Report dated May 28, 2008, issued in corresponding European Patent Application No. 08150899.6.
Kimata Yoshiyuki
Sato Hajime
Jiang Chen Wen
Mitsubishi Heavy Industries Ltd.
Westerman Hattori Daniels & Adrian LLP
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