SWASH PLATE TYPE VARIABLE DISPLACEMENT COMPRESSOR

摘要

A compressor according to the present invention has a housing including a first and second cylinder bores. The inner diameter of the first cylinder bore is smaller than that of the second cylinder bore. In suction process, refrigerant gas is directly drawn from an inlet port into a first suction chamber. The refrigerant gas is flowed from the first suction chamber into a first compression chamber. In contrast, refrigerant gas is drawn through the inlet port, a first suction passage, the first suction chamber, a first communication passage, a swash plate chamber and a second communication passage and into a second compression chamber. According to the above-described compressor, wherein the inner diameter of the first cylinder bore is smaller than the second cylinder bore, the difference of the amplitude of the intake pulsation between the first compression chamber and the second compression chamber can be suitably reduced.

主权项

1. A swash plate type variable displacement compressor comprising:
a housing having therein a suction chamber into which refrigerant gas is drawn through an inlet port, a discharge chamber, a swash plate chamber and a cylinder bore; a drive shaft rotatably supported by the housing; a swash plate which is rotatable by the rotation of the drive shaft in the swash plate chamber; a link mechanism provided between the drive shaft and the swash plate and allowing the swash plate to change the inclination angle thereof with respect to the direction perpendicular to the axis of rotation of the drive shaft; a piston received to reciprocate in the cylinder bore; a conversion mechanism converting rotation of the swash plate into reciprocating movement of the piston in the cylinder bore for a stroke length that is determined by the inclination angle of the swash plate; a actuator allowing the swash plate to change the inclination angle of the swash plate; and a control mechanism controlling the actuator, wherein the cylinder bore includes a first cylinder bore provided on one side of the swash plate and a second cylinder bore on the other side of the swash plate, wherein the piston includes a first head that reciprocates in the first cylinder bore and forms a first compression chamber in the first cylinder bore and a second head that reciprocates in the second cylinder bore and forms a second compression chamber in the second cylinder bore, wherein the link mechanism is configured so that the top dead center position of the first head moves for a longer distance according to the change of the inclination angle of the swash plate than that of the second head, wherein the actuator includes an actuator body that is connected to the swash plate and partially movable in the direction of the axis of rotation of the drive shaft and a pressure control chamber that moves a part of the actuator body by the pressure in the pressure control chamber that is variable by the control mechanism, wherein the swash plate type variable displacement compressor further includes, a first suction flow passage through which the refrigerant gas drawn through the inlet port flows into the first compression chamber; a second suction flow passage through which the refrigerant gas drawn through the inlet port flows into the second compression chamber; a first suction valve mechanism provided in the first suction flow passage; and a second suction valve mechanism provided in the second suction flow passage, wherein the inner diameter of the first cylinder bore is smaller than that of the second cylinder bore, wherein the compressor has at least either a structure in which the first suction flow passage is different from the second suction flow passage and a structure in which the first suction valve mechanism is different from the second suction valve mechanism so that the refrigerant is drawn easily through the inlet port into the first compression chamber as compared to the case that the refrigerant gas is drawn through the inlet port into the second compression chamber.