Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1983-03-10
1983-12-20
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 67, 277 961, 277133, F16J 1534
Patent
active
044213212
ABSTRACT:
A non-contacting, hydrodynamic end face seal in a machine comprises a disc-shaped rotor (1) attached to the machine shaft (2) and an annular stator (3) concentric with the rotor (1) and facing the rotor surface (11) at a small distance. From the stator surface (31) project a number of radially extending weirs (34) which form wedge-shaped gaps with the rotor surface, so formed that the gaps decrease in width in the direction of the velocity of the rotor surface (11) across the weirs, causing a hydrodynamic pressure to build up between the weir edges a and b. The outer end of each weir (34) is connected to the inner end of the adjacent weir (34), downstream thereof, by a diagonal ridge (35) of a height not exceeding the maximum height of the weirs (34), the ridges and weirs containing between them a high-pressure zone (HP). A rim (36) surrounds the weirs (34) and ridges (35) on their outside and projects from the stator surface (31) towards the rotor surface (11) to a height equal to the maximum height of the weirs (34), and thus forms a dam preventing liquid from escaping to the outside of the seal.
REFERENCES:
patent: 3292847 (1966-12-01), Herrick
patent: 3744805 (1973-07-01), Heinrich
patent: 3937477 (1976-02-01), Gyory ?
patent: 4076259 (1978-02-01), Raimondi
patent: 4099729 (1978-07-01), Mylykke
patent: 4212475 (1980-07-01), Sedy
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