Patent ID: 6619062
Filing Date: 2003-09-16
Classification: F04C,F25B,Y02B

Abstract:
A scroll compressor having a movable scroll and a fixed scroll forming a compression chamber compressing a refrigerant, said scroll compressor comprising:a variable-speed motor driving said movable scroll; capacity control means controlling the capacity of said scroll compressor by supplying said refrigerant into said compression chamber or bypassing said refrigerant from said compression chamber to a low-pressure side; an operating state detection part detecting the operating state of said scroll compressor; and a control part controlling operation of said capacity control means and the rotational frequency of said motor; wherein said operating state detection part includes an operating pressure ratio detection part detecting an operating pressure ratio indicating the value of the ratio of a suction pressure for said refrigerant to a discharge pressure for said refrigerant and a required ability detection part detecting required ability in operation of said scroll compressor, and wherein said control part controls operation of said capacity control means and the rotational frequency of said motor in response to said operating pressure ratio and said required ability.