CYLINDER UNLOADING MECHANISM FOR REFRIGERATION COMPRESSOR

摘要

Emanuel Duane Fry Herbert G. Siewert CYLINDER UNLOADING MECHANISM FOR REFRIGERATION COMPRESSOR A cylinder unloading mechanism for a multi-cylinder compressor including a block having a plurality of cylinders. Each cylinder is closed by a valve plate having suction and discharge ports communicating with the cylinder and respectively having spring-biased suction and discharge valves. A cylinder head is secured to the valve plate and has suction and discharge chambers respectively communicating with the suction and discharge ports. Suction and discharge passages respectively communicate with the suction and discharge chambers in the head. A partition in the head divides the suction chamber into first and second sections respectively communicating with the suction port and suction passage, the partition having an unloading port communicating with the two sections of the suction chamber. A valve selectively opens and closes the unloading port and is actuated by a double-acting fluid power cylinder mounted on the head, the cylinder having fluid pressure lines adapted to be connected to an external source of fluid under pressure.