Variable displacement compressor

A variable displacement compressor (10), comprising an airtight crank chamber (12) and a variable inclination angle swing body (14) installed on an axis (11) of rotation inside said crank chamber (12), at least one piston (17) reciprocally guided in a cylinder (15) and connected to said swing body, said cylinder (15) being selectively connectable to a suction chamber (3) in turn connected to a low-pressure refrigerant pipe conduit (1) or to a discharge chamber (4) in turn connected to a high-pressure refrigerant pipe conduit (2), and means in said variable displacement compressor (10) for varying the amount of discharge of said refrigerant into said discharge chamber (4) between a minimum discharge amount in a minimum operation state of the compressor and a maximum discharge amount by varying the angle of inclination of said swing body corresponding to a change of a pressure (Pc) within said crank chamber, and further comprising a main valve (21, 22) between said low-pressure refrigerant pipe conduit (1) and said suction chamber (3), said main valve being actuable between a fully closed state and a fully opened state, wherein as said main valve a differential-pressure sensing open and close valve (21, 22, 23, 24) is provided which opens and closes respectively when a differential pressure (Pd) minus (Pe) between the pressure (Pd) of the refrigerant in said discharge chamber (4) and the pressure of the refrigerant in said low-pressure refrigerant pipe conduit (1) is larger or smaller than a predetermined differential pressure value.

A variable displacement compressor (10), comprising an airtight crank chamber (12) and a variable inclination angle swing body (14) installed on an axis (11) of rotation inside said crank chamber (12), at least one piston (17) reciprocally guided in a cylinder (15) and connected to said swing body, said cylinder (15) being selectively connectable to a suction chamber (3) in turn connected to a low-pressure refrigerant pipe conduit (1) or to a discharge chamber (4) in turn connected to a high-pressure refrigerant pipe conduit (2), and means in said variable displacement compressor (10) for varying the amount of discharge of said refrigerant into said discharge chamber (4) between a minimum discharge amount in a minimum operation state of the compressor and a maximum discharge amount by varying the angle of inclination of said swing body corresponding to a change of a pressure (Pc) within said crank chamber, and further comprising a main valve (21, 22) between said low-pressure refrigerant pipe conduit (1) and said suction chamber (3), said main valve being actuable between a fully closed state and a fully opened state, wherein as said main valve a temperature sensing open and close valve (21, 22, 23, 24, 32) for low-pressure refrigerant is provided between said low-pressure refrigerant pipe conduit (1) and said suction chamber (3) which opens and closes respectively when the temperature of the refrigerant in said suction chamber (3) and/or said low-pressure pipe conduit (1) is higher or lower than a predetermined temperature value.

A variable displacement compressor (10), comprising an airtight crank chamber (12) and a variable inclination angle swing body (14) installed on an axis (11) of rotation inside said crank chamber (12), at least one piston (17) reciprocally guided in a cylinder (15) and connected to said swing body, said cylinder (15) being selectively connectable to a suction chamber (3) in turn connected to a low-pressure refrigerant pipe conduit (1) or to a discharge chamber (4) in turn connected to a high-pressure refrigerant pipe conduit (2), and means in said variable displacement compressor (10) for varying the amount of discharge of said refrigerant into said discharge chamber (4) between a minimum discharge amount in a minimum operation state of the compressor and a maximum discharge amount by varying the angle of inclination of said swing body corresponding to a change of a pressure (Pc) within said crank chamber, and further comprising a main valve (21, 22) between said low-pressure refrigerant pipe conduit (1) and said suction chamber (3), said main valve being actuable between a fully closed state and a fully opened state, wherein as said main valve a pressure sensing open and close valve (21, 22, 23, 24, 36) for low-pressure refrigerant is provided between said low-pressure refrigerant pipe conduit (1) and said suction chamber (3) which opens and closes respectively when the pressure of the refrigerant in said low-pressure refrigerant pipe conduit (1) is lower or higher than a predetermined pressure value.