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US 3,958,905 AGranted
Centrifugal compressor with indexed inducer section and pads for damping vibrations therein
AssigneeDeere & Company
InventorHomer J. Wood
Life of this patent
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AssigneeDeere & Company
InventorHomer J. Wood
Estimating the term…
A centrifugal compressor assembly for a gas turbine engine includes an inducer section and an impeller section mounted for rotation about an axis. Because leading edges of the impeller blades are cambered, damper pads, extending perpendicular to the low pressure sides thereof also extend axially forward. Blades of the inducer section are indexed rotationally rearward of the impeller blades to improve the distribution of compression gases through the impeller section and high pressure surfaces of the inducer blades mate near their leading edges with outward surfaces of the damper pads. Because the pads and inducer blades vibrate at different frequencies, inducer blade vibrations that might otherwise cause fatigue are attenuated by contact with the damper pads. The damper pad arrangement thus permits the damping of vibrations in the inducer blades notwithstanding the indexed relationship between the inducer section and the impeller section.
A centrifugal compressor for a gas turbine engine comprising:
A centrifugal compressor comprising an inducer section and an impeller section mounted for rotation as a unit about a common central axis, the sections being coaxially disposed in abutting relation, each section including a hub and a plurality of blades extending therefrom, the impeller blades having inlet edges and the inducer blades having outlet edges, the impeller blades being rotationally staggered relative to the inducer blades about the axis forming pairs of adjacent impeller and inducer blades, the outlet edge of each inducer blade defining an opening with the inlet edge of an adjacent impeller blade, and a vibration amplitude limiting means projecting from the impeller blade across the opening and engaging the adjacent inducer blade without being secured thereto to limit vibration therein.
In a centrifugal compressor having a bladed impeller section and an inducer section with blades indexed relative to corresponding blades of the impeller section, a plurality of pads, each being affixed to an impeller blade near a leading edge thereof and extending into vibration suppressing contact with a corresponding blade of the inducer section.
Dependencies are inferred from the claim text.