Patent ID: 6053500
Filing Date: 2000-04-25
Classification: F04D,F16J

Abstract:
A device at a seal housing for a rotary machine such as a pump for liquids, which comprises:a driving motor;a hydraulic part with rotary propelling means connected to said motor via a shaft which defines a rotational axis;a seal housing between said motor and said hydraulic part, said housing containing at least one mechanical face seal arranged within a cavity in said seal housing, said cavity defined by an annular wall with at least one internal helical groove opening axially towards said propelling means; anda slot between said rotary propelling means and said cavity, wherein said at least one internal helical groove downwardly winds in a rotational direction toward said propelling means and includes at least one substantially planar wall portion, the perpendicular axis of which is directed radially outward with reference to said rotational axis and toward the impeller; whereby said helical groove carries particles by centrifugal force out of said cavity toward said propelling means and through said slot.