Retractable segmented packing ring for fluid turbines

Details Retractable segmented packing ring for fluid turbines Retractable segmented packing ring for fluid turbines

F - Mech Eng,Light,Heat,Weapons

16

J

F16J 15/44 (2006.01)

Patent

CA 2130902

A segmented seal ring and spring sys- tem for steam turbines for minimizing leak- age between rotating (11) and stationary (12) components, and preventing damage and wear thereto, including a segmental seal sing (13), with first springs (16) biased against the seal segments (13) to urge the segments radially outward toward a large clearance position of the seal ring with respect to the turbine shaft. The springs (16) rage the seal segments (13) into the large clearance position at low shaft spends and small turbine loads, whereas at medium to high Hows and high working pres- sure, working fluid will overcome the spring forces and urge the seal segments into a small clearance position. Special gravity springs (36) are provided in the lower half seal ring segments (13) with the lower end of such springs seated against the turbine casing (12) while the upper spring end is biased against the seal segment (13).

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