Automatically positionable mechanical shaft seal
AssigneeNippon Pillar Packing Co., Ltd.
InventorYoshiaki Ohgoshi
Life of this patent
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Abstract
A mechanical seal made in a unit construction in which a seal unit case is fitted into and held by the inner periphery of a seal housing in a non-rotatable but axially slidable manner, the seal housing houses a rotary ring disposed on a rotary shaft in a non-rotatable but axially slidable manner, and a stationary ring in contact with the rotary ring at the sealing end surfaces thereof is securely fixed to the seal housing. The mechanical seal can be automatically moved to a position where a first fluid and a second fluid are balanced in pressure in response to a difference in pressure between these two fluids.
Claims11
A mechanical shaft seal for intercepting a first fluid and a second fluid, comprising:
- a rotary ring disposed on a rotary shaft in a non-rotatable but axially slidable manner;
- a stationary ring;
- a seal unit case for housing said rotary ring and to which said stationary ring is secured;
- a seal housing, said seal unit case being fitted in airtight fashion to and held by the inner periphery of said seal housing in a non-rotatable manner but being automatically axially displaceable to a position on the shaft at which said first and second fluids are balanced in pressure;
- and,
- a spring-load retaining mechanism disposed between said seal unit case and said rotary ring for applying spring-load to said rotary ring to maintain contact between said rotary ring and said stationary ring, regardless of the axial displacement of said unit case and the rotation of said rotary ring.
Dependencies are inferred from the claim text.