Patent ID: 7987872

Claim:
Diaphragm for throttling a volume flow in an air distribution ducting system of an air-conditioning unit of a commercial aircraft, comprising: a plurality of spring-elastic elements effecting the throttling of the volume flow through the diaphragm, the plurality of spring-elastic elements framed in an outer ring and having inner ends that define a central opening and an axial width in the direction of the volume flow, the width being selected depending on the throttling and a reduction of noise to be obtained, the plurality of spring-elastic elements defining a permeable region that includes openings residing between the spring-elastic elements that extend radially outwardly, the permeable region attenuating a formation of turbulence bundles, wherein the plurality of spring-elastic elements deforms to absorb kinetic energy of air particles in the volume flow, thereby causing the volume flow to decrease from the central opening to the outer ring.