PACKING DEVICE OF PISTON Russian patent published in 2011 - IPC F16J9/06 

FIELD: machine building.

SUBSTANCE: device consists of two concentric arranged pistons positioned in groove, of rings and of expander in form of set of spiral springs. A working piston ring has alternate wedge-shaped lugs on internal cylinder surface; the lugs freely enter slots of an additional ring. Cylinder springs are installed between surfaces of the slots in the wedge-shaped lugs. Under effect of the springs the piston ring is moved from the additional ring along inclined surfaces of the lugs and slots and is held down to a mirror of the cylinder thus ensuring a packing effect of the device. The slots are made on external cylinder surface of the additional ring, while the wedge-shaped lugs are made on internal cylinder surface of the piston ring.

EFFECT: increased reliability of piston packing device operation.

3 dwg