Patent ID: 6267562
Filing Date: 2001-07-31
Classification: F04B

Abstract:
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 a main valve actuating structure (23, 24, 32, 36) is provided actuating said main valve by refrigerant pressure into its closed state, said main valve actuating structure being responsive to a relative pressure condition or a relative temperature condition of the refrigerant in the low-pressure pipe conduit (1), which relative pressure condition or relative temperature condition in said minimum operation state of said compressor (10) is representing a small load condition.