ROTARY-TYPE 2-STAGE COMPRESSOR

摘要

The present invention provides a rotary-type two-stage compressor, comprising: a sealing container; a rotating shaft provided within the sealing container for transferring rotational force; a low-pressure compressing assembly including a low-pressure roller rotating eccentrically with respect to the center of the rotating shaft, a low-pressure cylinder housing the low-pressure roller, and a low-pressure vane partitioning an inner space of the low-pressure cylinder; a high-pressure compressing assembly including a high-pressure roller rotating eccentrically with respect to the center of the rotating shaft, a high-pressure cylinder housing the high-pressure roller, and a high-pressure vane partitioning an inner space of the high-pressure cylinder; a connecting pipe providing a passage for refrigerant compressed in the low-pressure compressing assembly to flow into the high-pressure compressing assembly; and an injection pipe connected to the connecting pipe, wherein an inner diameter at the middle of the connecting pipe is greater than that at either end of the connecting pipe.