Ventilating air intake arrangement

1. A ventilating air intake arrangement comprising:

a structure comprising at least one air passage channel, including an air vent having an air intake edge, to ventilate at least one confined zone in an aircraft with fresh air entering upstream, through said air vent, into said air passage channel and exiting downstream of the air passage channel towards said confined zone to be ventilated, and

a controllable blocking device that is configured to vary the cross section of said air passage channel, wherein:

said controllable blocking device comprises at least one membrane disposed at least partially in said air passage channel, elastically deformable under the action of a fluid control device, to vary the cross section of said air passage channel according to the speed and the altitude of said aircraft, and

said fluid control device comprises a link pipe, having an upstream end, a downstream end, and an open continuous path between said upstream end and said downstream end, said upstream end takes total pressure of the air entering through said air intake edge of the air vent and said downstream end of said link pipe applies said total pressure on said membrane so that said total pressure acts directly on said membrane for varying the cross section of said air passage channel.

2. The arrangement as claimed in claim 1 , wherein the upstream end of said link pipe takes said total pressure at the intake end of said air vent leading to the channel, and said downstream end of said pipe passes, in a sealed manner, through a communicating hole provided in said membrane.

3. The arrangement as claimed in claim 1 , wherein said membrane is attached to a support with which it defines a variable internal volume and which is added in a fixed way to a lateral wall delimiting said channel.

4. The arrangement as claimed in claim 1 , wherein said air passage channel has a rectangular cross section delimited by lateral walls opposing in pairs, one of the major lateral walls of said air passage channel comprising said elastically deformable membrane which, when said cross section is at its maximum, is eliminated from said air passage channel and, when said cross section is at its minimum, partially blocks said air passage channel.

5. The arrangement as claimed in claim 1 , wherein the elastic deformation of said membrane is guided axially and said link pipe serves as a guide for said membrane and fits perpendicularly into the center of said membrane.

6. The arrangement as claimed in claim 1 , wherein said elastically deformable membrane is one of circular or quadrangular.

7. The arrangement as claimed in claim 1 , further comprising a protection element at least partially covering said elastically deformable membrane.