Air valve assembly including split-shaft and seal arrangement

Details Air valve assembly including split-shaft and seal arrangement Air valve assembly including split-shaft and seal arrangement

1997-07-16

1999-11-23

Fox, John

Valves and valve actuation

Rotary valves

Butterfly

464 84, F61K 122

Patent

active

059885890

ABSTRACT:
An air valve assembly for use with a premixer for a gas turbine engine module. The air valve assembly includes a valve disk and a support plate having a valve aperture in which the valve disk is disposed for rotation, the support plate having aligned first and second shaft apertures through opposing support plate ends that define an axis of rotation of the valve disk. The assembly also has a first shaft having one end section rotatably supported in the first aperture and having another end section connected to the valve disk; a second shaft having one end section rotatably supported in and extending through the second shaft aperture and with a bearing end terminating outside the support plate, and also having another end section connected to the valve disk. The assembly further includes an actuator shaft having an engagement end in axial abutting contact with the second shaft bearing end; and a coupling interconnecting the second shaft and the actuator shaft for transmitting precise rotary motion therebetween, the coupling having high torsional rigidity and low axial rigidity. The assembly still further has a coupling housing surrounding the coupling, the second shaft bearing end, and the actuator shaft engagement end, and having an actuator shaft aperture through which the actuator shaft extends, and a seal disposed between the actuator shaft engagement end and the housing for preventing air flow past the actuator shaft through the actuator shaft aperture.

REFERENCES:
patent: 3606980 (1971-09-01), Simpson et al.
patent: 4373542 (1983-02-01), Scaramucci
patent: 4634094 (1987-01-01), Geiser
patent: 4901979 (1990-02-01), Garrigues et al.

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