Patent ID: 6471214
Filing Date: 2002-10-29
Classification: F04D,F16J

Abstract:
A seal for a driveshaft (1) of a pump for pumping cryogenic liquid, comprising: the seal formed as a tandem axial face seal, a sliding ring (14) with sliding faces (15, 16) on both sides and a spiral-shaped groove terminating at an outer periphery, the sliding ring (14) mounted on the driveshaft (1), the sliding faces (15, 16) each adjoined by a sealing ring (17, 18), one side of each of the sliding faces (15, 16) tightly connected via a metal bellows (19, 20) with a first housing cover (26) on a pump side which is to be sealed and with a second housing cover (27) on a motor side, and a chamber (22) outside of the sliding ring (14) in communication with the cryogenic liquid.