Borescope plug

Details Borescope plug Borescope plug

1990-09-12

1992-05-26

Bertsch, Richard A.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

415118, F02G 100

Patent

active

051156369

ABSTRACT:
A borescope sealing apparatus and plug includes semi-spherical sealing surfaces on the plug's sealing end and a conical hole sealing seat to receive the sealing end. The invention provides good sealing during engine operation wherein thermal growth causes misalignment of the borescope holes. The borescope plug further includes an axial shaft and a spring loaded end having a spring means which is operable to bias the sealing end into the sealing seat. The spring means suggested are crest to crest wave spring, coiled spring, and a pressurized bellows. The sealing apparatus and borescope plug is particularly useful for sealing borescope holes in double wall casings such as those found in gas turbine engines.

REFERENCES:
patent: 3362160 (1968-01-01), Bourgeois
patent: 3936217 (1976-02-01), Travaglini et al.
patent: 4300774 (1981-11-01), Hollis et al.
patent: 4406580 (1983-09-01), Baran, Jr.
patent: 4470735 (1984-09-01), Salisbury
patent: 4815276 (1989-03-01), Hansel et al.
Dover AGE19009 Proprietary Borescope Plug Proposal Dover Corporation/Cook Airtomic Division By: Luis A. Camacho, Project Engineer, May 16, 1986.

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