DOUBLE-STAGED ROTARY COMPRESSOR Russian patent published in 2013 - IPC F04C23/00 F04C18/356 F04C28/06 F04C28/26 

FIELD: machine building.

SUBSTANCE: double-staged compressor 100, which is a double-staged rotary compressor with internal high pressure, includes a cover 19 of a low pressure stage, which closes an outlet hole 16 of the low pressure stage and forms inside an outlet space 20 of the low pressure stage. The compressor 100 is made with an intermediate channel 51 in a compression mechanism 3, and this channel connects the outlet space 20 of the low pressure stage and a compression chamber 35 of the high pressure stage. The compressor 100 is equipped with a relief mechanism in the cover 19 of the low pressure stage. The relief mechanism opens, when the load is less than the pre-determined load, and at the same time it connects the outlet space 20 of the low pressure stage and the space 53, in which the outlet pressure is maintained.

EFFECT: provision of suppression of pressure pulsations in an intermediate channel and for prevention of operation efficiency drop during operation under low load.

7 cl, 7 dwg