Device for sealing inspection apertures

Details Device for sealing inspection apertures Device for sealing inspection apertures

1990-08-07

1992-01-14

Bertsch, Richard A.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

415118, F02G 100

Patent

active

050799100

ABSTRACT:
A device (26) for sealing an inspection aperture in a casing (28) of a gas turbine engine (10) comprises a hollow housing (36) and a sealing plate (54). The housing (36) has an inspection aperture (40A) and a sealing ball (42). The sealing ball (42) moves along an arcuate track (45) formed on the housing (36) between a first position in which the sealing ball (42) seals against a conical seat (44) around the aperture (40A) and a second position in which the sealing ball (42) is displaced radially from the axis (52) of the inspection aperture (40A) to allow a borescope to be inserted therethrough.
Normally the sealing plate (54), which has a cylindrical member (58), is arranged so that the cylindrical member (58) fits coaxially within and seals the aperture (40A). The sealing plate (54) is normally secured to the housing (36). If the sealing plate (54) is incorrectly refitted, the sealing ball (42) is arranged to move under gravity to the first position, and is held in this position in operation of the gas turbine by gas pressure.

REFERENCES:
patent: 3936217 (1976-02-01), Travaglini et al.
patent: 4815276 (1989-03-01), Hansel et al.
patent: 4825642 (1989-05-01), Radtke

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