PUMP FOR CRYOGENIC LIQUIDS Russian patent published in 1995 - IPC

FIELD: cryogenic engineering. SUBSTANCE: sealing unit has fixed ring mounted inside the housing of the pump and metal bellows mounted coaxially to the shaft. One face of the bellows is secured to the fixed ring. The other face is secured to the face flange. The heating unit is made up as a metallic (copper) bushing. The bushing is made up as a flange having the one-sided projection. The projection is positioned inside the bellows to define a slot seal between the shaft and bushing. The electric heating unit is positioned on the face of the flange exposed to the atmosphere. The heating member is connected to the bushing and enclosed by the insulating casing. A part of the heating device is outside of the housing and provided with the heat insulating casing. EFFECT: improved design. 1 dwg