Patent ID: 6443708
Filing Date: 2002-09-03
Classification: F04B,F25B

Abstract:
A compression volume control apparatus for a refrigeration cycle, comprising:a variable displacement refrigerant compressor having a suction chamber; a low-pressure refrigerant pipe connected to the variable displacement refrigerant compressor; a high-pressure refrigerant pipe; a refrigerant discharge chamber connected to the high-pressure refrigerant pipe; a pressure adjusting chamber; and an electromagnetic control valve operating by electromagnetic force coupled in flow connection between the pressure adjusting chamber and at least one of the refrigerant discharge chamber and the suction chamber, wherein the refrigerant discharge volume is variable by varying a pressure in the pressure adjusting chamber, wherein the electromagnetic control valve controls a differential pressure between at least one of a pressure in the pressure adjusting chamber and a pressure in the suction chamber at one side of the electromagnetic control valve and the electromagnetic control valve controls a pressure in the discharge chamber at another side of the electromagnetic control valve to a predetermined differential pressure value to control a refrigerant discharge volume, and wherein the differential pressure value is variable by varying the electromagnetic force of the electromagnetic control valve.