SPIRAL MACHINE WITH UNLOADING DEVICE Russian patent published in 2001 - IPC

FIELD: air, gas, refrigerating and vacuum spiral machines provided with unloading devices. SUBSTANCE: spiral machine includes fixed spiral member thrown into engagement with movable spiral member, suction and discharge chamber, anti-rotational device, eccentric shaft in bearings supports, thrust bearing, unloading device located on bearing side of movable spiral member including piston forming unloading chamber with sealing members connected with intermediate-pressure chamber by means of passage. Piston provided with upper circular surface and lateral cylindrical surface is located in cylindrical guide surfaces of housing provided with circular grooves for sealing members. Circular surface of piston is made in sliding thrust bearing for contact with bearing side of movable spiral member. EFFECT: possibility of positioning unloading chamber away from delivery area at high thermal loads; enhanced reliability and durability. 3 cl, 3 dwg