Patent ID: 7651321
Filing Date: 2010-01-26
Classification: F04B

Abstract:
1. A variable displacement compressor having a piston accommodated in a cylinder bore, the piston operating to draw from a suction chamber into the cylinder bore refrigerant gas that has been introduced into the suction chamber through a suction line, the piston compressing the refrigerant gas in the cylinder bore and discharging the refrigerant gas into a discharge chamber, the refrigerant gas being allowed to flow from the discharge chamber into a crank chamber through a supply passage, and from the crank chamber into the suction chamber through an outlet line for adjusting the pressure in the crank chamber, a stroke of the piston changing in correspondence with the pressure in the crank chamber, the compressor comprising: an open degree adjustment valve, which has a first valve body for adjusting an open degree of the suction line, a second valve body for adjusting an open degree of the outlet line, and a valve chamber accommodating the first valve body and the second valve body, wherein the first valve body and the second valve body are connected to each other movably in the valve chamber in correspondence with a pressure in the suction chamber and the pressure in the crank chamber, wherein the first valve body moves in such a manner as to increase the open degree of the suction line when the difference between the pressure in the suction chamber and the pressure in the crank chamber decreases, and reduce the open degree of the suction line when the difference between the pressure in the suction chamber and the pressure in the crank chamber increases, wherein the second valve body moves in such a manner as to increase the open degree of the outlet line when the difference between the pressure in the suction chamber and the pressure in the crank chamber decreases, and reduce the open degree of the outlet line when the difference between the pressure in the suction chamber and the pressure in the crank chamber increases, and wherein the first valve body and the second valve body are allowed to move independently from each other.