LIQUID PUMP FOR CONVEYING DELICATE COMMODITIES; PRIMARY LIQUID SUBJECTED TO COANDA EFFECT WHEN ENTERING SECONDARY LIQUID

摘要

A liquid pump for conveying sensitive materials from a first to a second location through a main duct. The pump has a first segment through which secondary liquid flows with the materials. An inlet orifice receiving primary liquid from a plenum has a convex or Coanda surface and injects primary liquid into the main duct downstream of the first segment. The primary liquid intercepts the convex surface substantially tangentially and is turned through an angle to one more closely resembling the angle of the longitudinal axis of the pump. The first segment has a fustro-conical control surface which diverges outwardly immediately adjacent the outlet end of the first segment. The inside diameter of the outlet end of the first segment immediately before the control surface is substantially identical to the inside diameter of the second segment immediately downstream of the Coanda surface. Liquid directing vanes are positioned in the plenum just prior to the inlet orifice.