Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1993-01-04
1995-03-07
DePumpo, Daniel G.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 54, 277192, 415229, F16J 1544
Patent
active
053951247
ABSTRACT:
A segmented seal ring and spring system for steam turbines for minimizing leakage between rotating and stationary components, and preventing damage and wear thereto, including a segmented seal ring, with first springs biased against the seal segments to urge the segments radially outward toward a large clearance position of the seal ring with respect to the turbine shaft. The springs urge the seal segments into the large clearance position at low shaft speeds and small turbine loads, whereas at medium to high flows and high working pressure, working fluid will overcome the spring forces and urge the seal segments into a small clearance position. Special gravity springs are provided in the lower half seal ring segments with the lower end of such springs seated against the turbine casing while the upper spring end is biased against the seal segment to produce an upward force which neutralizes the downward force caused by the weight of the segment. The gravity spring provides a spring force in the vertical direction which is equal to the weight of the segment which it supports so that the fluid pressure forces required to close the lower seal segments is the same as the radially outward biasing spring force and the friction forces. The gravity springs, by reducing or eliminating the weight forces of the lower seal segments, avoids the friction and interference which might otherwise interfere with the radial inward movement of the segments to the small clearance position.
REFERENCES:
patent: 1041534 (1912-10-01), Wagner
patent: 2073888 (1937-03-01), Toward
patent: 3594010 (1971-07-01), Warth
patent: 4017088 (1977-04-01), Lerjen
patent: 4436311 (1984-03-01), Brandon
DePumpo Daniel G.
IMO Industries Inc.
Young Philip
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