Patent ID: 6941973

Claim:
A diaphragm comprising an inflow side and a backside and at least one transdiaphragm flow duct from said inflow side to said backside, wherein said inflow side comprises a flow face and an orifice cross section of an inlet orifice of the transdiaphragm flow duct and has a relatively low area ratio of said orifice cross section compared to said flow face and said backside comprises a backside surface comprising a flow outlet of the transdiaphragm flow duct and a flow duct exit orifice or flow duct outlet, wherein said flow face and said backside are designed to separate two chambers and said flow duct exit orifice or flow duct outlet comprises one or more of the following: a rounding of a flow duct edge in an outflow direction; a geometrical or streamline element for a flow-shaping, wherein said geometrical or streamline element has a low flow resistance coefficient c F ; a continuous cross section widening in the manner of a trumpet or of a Laval nozzle outlet; and/or a diffuser with a curved longitudinal section, wherein the transdiaphragm flow duct comprises: an inflow duct from x 0 to x 2, wherein x 0 is at said flow face and x 2 is at a bifurcation outlet, and an evacuation duct from x 2 to x 3, wherein x 2 is at said bifurcation outlet and x 3 is at said flow duct exit orifice or flow duct outlet, and at least one bifurcation per transdiaphragm flow duct cross-section comprising a flow duct branch from x 1 to x 2 , wherein said flow duct branch comprises a location between said inflow duct and said evacuation duct and x 1 is at a bifurcation inlet and x 2 is at said bifurcation outlet, and a bifurcation backflow duct branching off from the bifurcation, wherein the bifurcation backflow duct leads to a bifurcation backflow outlet in said flow face at x 0 .