System for sealing passages in the walls of glandless circulating pumps or the like

摘要

The passage in a wall which separates the interior of the housing of a glandless submersible motor pump from the surrounding atmosphere is normally sealed by an annular seat which is placed against the end face of a muff forming a detachable part of the wall, and by a temperature- and pressure-resistant ceramic sleeve which surrounds an elongated metallic conductor and normally bears against the seat owing to the pressure differential between the interior of the housing and the surrounding atmosphere. If the sleeve is destroyed, a normally confined plunger of the conductor bears directly against the seat to prevent escape of fluid from the pump housing. That end portion of the conductor which extends into the housing is surrounded by one or more layers of insulating tape and by a tubular sheath which is shrunk onto the tape and exhibits at least some thermal-shock-absorbing characteristics. The plunger bears against an O-ring which prevents leakage of fluid into the space between the peripheral surface of the conductor and the internal surface of the sleeve. Additional O-rings and/or layers of temperature-resistant cement are interposed into the path or paths of potential escape of fluid from the interior of the pump housing.