DOUBLE MECHANICAL SEAL, A STATIONARY SLIDE RING THEREOF AND A PUMP HOUSING IN A CENTRIFUGAL PUMP

摘要

A double mechanical seal includes a primary stationary seal ring, a primary rotary seal ring, a secondary stationary seal ring and a secondary rotary seal ring. The primary stationary seal ring includes a slide ring and a primary carrier ring, the primary carrier ring having a first axial end with a seat for the slide ring and a second axial end with a rim opposite the first axial end. The secondary stationary seal ring includes a slide ring and a secondary carrier ring, the secondary carrier ring having an inlet recess or opening and an outlet recess or opening for a barrier fluid. The primary carrier ring has a recessed and oblong section or an oblong opening, and the inlet and outlet recesses or openings in the secondary carrier ring are arranged, when in use, in radial flow communication with the recessed and oblong section or the oblong opening.