US 11,773,870 B1
Variable channel diffuser
Craig M. Beers, Wethersfield, CT (US); and Brent J. Merritt, Southwick, MA (US)
Assigned to Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Sep. 12, 2022, as Appl. No. 17/942,963.
Int. Cl. F04D 29/44 (2006.01); B64D 13/06 (2006.01); F01D 17/18 (2006.01); F01D 17/14 (2006.01); F04D 29/46 (2006.01); F01D 17/08 (2006.01); F16K 11/065 (2006.01)
CPC F04D 29/444 (2013.01) [B64D 13/06 (2013.01); F01D 17/08 (2013.01); F01D 17/143 (2013.01); F01D 17/145 (2013.01); F01D 17/18 (2013.01); F04D 29/464 (2013.01); B64D 2013/0603 (2013.01); F16K 11/065 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A variable diffuser comprising:
a backing plate;
a shroud;
a first divider between the backing plate and the shroud;
a first diffuser channel between the backing plate and the first divider, the first diffuser channel comprising:
a first channel inlet; and
a first outlet;
a second diffuser channel between the first divider and the shroud, the second diffuser channel comprising:
a second channel inlet adjacent to the first channel inlet; and
a second outlet adjacent to the first outlet; and
a valve controlling flow through the second diffuser channel, wherein the valve moves between a first position and a second position, wherein the valve is connected to a servo pressure duct which provides servo pressure air to move the valve between the first position and the second position, and wherein the servo pressure air is a mixture of ambient pressure air and compressed pressure air.