Patent ID: 6224322
Filing Date: 2001-05-01
Classification: F04D

Abstract:
In a centrifugal pump having a seal housing for a stationary seal in outer spaced surrounding relation to a drive shaft, an impeller and an expeller mounted on said drive shaft forwardly of said seal housing wherein said expeller is operative to resist liquid flow into said seal housing when said drive shaft is rotated at a predetermined rate of speed, the improvement comprising:an annular barrier seal member interposed in a gap between said expeller and said seal housing, said gap changing in width in response to axial movement of said seal housing toward and away from said expeller when said drive shaft is being rotated, said seal member including an outer jacket of a flexible material, an annular spring of generally conical configuration secured in said jacket, said seal member extending at an acute angle between confronting surfaces of said expeller and said housing with opposite edges of said jacket maintaining sealing engagement with said expeller and said housing notwithstanding variations in the width of said gap.