ROD COMBINATION SEAL Russian patent published in 2001 - IPC

FIELD: mechanical engineering. SUBSTANCE: rod seal may be used in pumping-over of liquids polluted mechanically with sand, clay and slime. Seal is positioned between body and rod. It has two flexible rings mounted one after another, rectangular in section, each being provided with two dead-end internal cylindrical grooves and fastening flanges. The nearest to sealed cavity grooves contain two or three split scrapers each in the form of split rings, rectangular in shape and section, mounted tightly and fitted on rod with interference. Cuts of adjacent rings are shifted by 180 deg over circle relative to each other. Rings are manufactured from antifriction wear-resistant flexible media. Each of other grooves accommodates two low-friction rings made of fluoropolymer strips jointed by means of lock, type "pin-slot" and set on rod. Locks of rings are shifted by 180 deg over circle relative to each other. Flexible ring, front one relative to sealed cavity is positioned in cavity itself and does not contact body with external cylindrical surface. Rear flexible ring is set tightly with its external cylindrical surface into bushing of body which secures flange of front flexible ring in body and is pressed by threaded journal box along axis. EFFECT: enhanced reliability, extended service life of seal. 4 dwg