Patent ID: 7972119
Filing Date: 2011-07-05
Classification: F04B

Abstract:
1. A variable displacement compressor comprising: a housing defining a crank chamber; a rotary shaft rotatably supported by the housing; a swash plate accommodated in the crank chamber, tiltably supported by the rotary shaft and rotating integrally with the rotary shaft; a suction-pressure region including a suction chamber and a suction passage through which refrigerant gas under a pressure lower than a discharge pressure passes to the suction chamber; a suction throttle valve having a valve body for adjusting the opening of the suction passage, the suction throttle valve arranged in the suction passage and defining an upstream suction-pressure region located upstream of the suction throttle valve and a downstream suction-pressure region located downstream of the suction throttle valve in the suction-pressure region; an oil reservoir storing lubricating oil separated from refrigerant gas; a lubricating oil passage connecting the oil reservoir to the upstream suction-pressure region; a gas flow passage connecting the crank chamber to the suction chamber; a communication passage connecting the lubricating oil passage to at least one of the downstream suction-pressure region, the gas flow passage and the crank chamber; and a throttle mechanism provided in the lubricating oil passage between the oil reservoir and a position where the communication passage connects to the lubricating oil passage.