SEALING UNIT FOR REVOLVING SHAFTS AND SHIP'S STERN TUBES Russian patent published in 2004 - IPC

FIELD: sealing technology. SUBSTANCE: provision is made for compensation of pressure fluctuations in lubricant oil chamber of proposed sealing unit. Change in pressure is indicated by sensor and its magnitude is furnished to comparator gate which controls pressure valve for control of degree of filling of swelling body in form of circular hose. Swelling body acts on volume of lube oil chamber. Minimum pressure fluctuations in lube oil chamber are set due to 180-deg. phase shift of pressure pulse arising at increase of volume of swelling body. EFFECT: enhanced efficiency. 6 cl, 2 dwg