Bell seal and retaining nut for high pressure turbines

Details Bell seal and retaining nut for high pressure turbines Bell seal and retaining nut for high pressure turbines

F - Mech Eng,Light,Heat,Weapons

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60/56, 277/60

F01D 25/26 (2006.01) F01D 9/06 (2006.01)

Patent

CA 1325029

24 ABSTRACT OF THE DISCLOSURE A bell seal unit and retaining nut for use in the nozzle chamber unit of an elastic fluid turbine, such as the steam turbine used to drive electrical utility genera- tors. The bell seal unit includes a radial flange with an end face sealing surface and a skirt portion with a lower skirt margin subdivided into a labryinth seal region and a guiding and wear resisting region. The labryinth seal region includes plural, spaced apart circumferential seal lands and grooves, and the guiding and wear resisting region includes plural axial lands and grooves. The bell seal unit is positioned for free but limited axial movement by a retaining nut which includes a smooth inner cylindri- cal surface, a shoulder surface and a lower flange surface. Plural slots extend between the shoulder and flange surfac- es to facilitate fluid flow to the lower surface of the bell seal radial flange.

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