Patent ID: 9206906
Filing Date: 2015-12-08
Classification: F04D,F16C,F16J

Abstract:
1. A mechanical seal comprising: a stationary portion; a rotatable portion; a support assembly mounting the rotatable portion to the stationary portion, the rotatable portion being rotatable relative to the support assembly about a rotation axis; opposed first and second sealing faces, the first sealing face mounted on the rotatable portion and the second sealing face mounted on the support assembly, the first and second sealing faces being arranged to be urged into contact to form a seal therebetween to inhibit ingress of fluid between the rotatable portion and the support assembly; and a joint permitting rotary movement between the support assembly and the stationary portion to allow adjustment of a position of the rotatable portion relative to the stationary portion without affecting an alignment of the first and second sealing faces; wherein the support assembly incorporates a base portion that surrounds the rotatable portion, a moveable portion on which the second sealing face is disposed, and a biasing device disposed between the moveable portion and the base portion and operative to impart a biasing force to move the second sealing face into contact with the first sealing face, the biasing device being fluid impervious and forming part of a fluid barrier of the mechanical seal that extends from the seal formed between the first sealing face and second sealing face to the stationary portion; and wherein the base portion is axially movable relative to the rotatable portion and, in use, a running clearance is provided between the base portion and rotatable portion to permit axial movement between the stationary portion and the rotatable portion.