SEALING UNIT Russian patent published in 1994 - IPC

FIELD: pumps. SUBSTANCE: floating ring with working and non-working ends embracing the shaft forming the throttling slit is mounted in stator housing. Inserted in the floating ring on the side of non-working end is deformable thin-walled bush forming the circular chamber between inner surface of ring and bush which is brought in communication with the high-pressure chamber. On the low-pressure side, the end of the bush is tightly engageable with ring over cylindrical and end surfaces which are engageable with mating surfaces of bore seat in ring body. Amount of clearance between shaft and cylindrical section of ring with minimum diameter is more than thickness of bush wall in this conjugation. On the side of high-pressure chamber, bush is engageable with ring and is locked in it in the radial and axial coordinates. Circular chamber between inner chamber of ring and bush is brought in communication with high-pressure chamber by means of passages provided in ring body and in bush on side of non-working end. Bush is locked relative to ring by means of permanent joint made in form of welded joint, complete joint or threaded joint. EFFECT: enhanced efficiency. 3 cl, 5 dwg