Improvements in shaft seals, particularly for centrifugal pumps

摘要

675,328. Stuffing-box substitutes. WILFLEY & SONS, Inc., A. R. Aug. 2, 1950 [Aug. 11, 1949], No. 19278/50. Class 122(v) The shaft bearing BSP1/SP of a centrifugal pump is protected from contact with the pumped liquid by a centrifugal seal comprising a cylinder C carried by the rotating shaft and having internal helical ribs 54, closely embracing a fixed cylinder D provided with two annular shoulders 22, 23. When stationary the bearing is protected by the packing F pressed by the spring 33 against the ribs 32. Centrifugal weights 37 lift the packing off the rib when the shaft revolves. Specification 432,838 is referred to.