Multistage hermetic rotary compressor

摘要

An object is to provide a high inner pressure type multistage compression rotary compressor capable of avoiding beforehand generation of vane fly of a second rotary compression element and realizing a stabilized operation, the rotary compressor includes a communication path which connects an intermediate pressure region to a region having a low pressure as a suction pressure of a first rotary compression element; and a valve device which opens or closes this communication path, the rotary compressor applies a high pressure as a back pressure of an upper vane, and this valve device opens the communication path in a case where a pressure difference between the intermediate pressure and the low pressure increases a predetermined upper limit value before the intermediate pressure reaches the high pressure.