Pressure relief device having a pressure relief flap

Patent metadata

Field	Value
Publication number	US-2020340407-A1
Application number	US-202016845764-A
Country	US
Kind code	A1
Filing date	Apr 10, 2020
Priority date	Apr 25, 2019
Publication date	Oct 29, 2020
Grant date	—

Abstract

A pressure-release device has a pressure-release flap arranged in a delimiting wall of a chamber of an aircraft engine which opens in the presence of a predefined pressure in the chamber. The pressure-release flap includes a flap region and a hinge. The flap region is defined by a perforation formed in the delimiting wall which delimits the flap region with respect to a surrounding region of the delimiting wall. The perforation is formed such that, in the presence of the predefined pressure in the chamber, the flap region pivots open relative to the surrounding region, with the perforation rupturing, and the hinge is fixedly connected to the surrounding region and the flap region, such that the hinge holds the flap region on the surrounding region in the event of a rupture of the perforation and a pivoting-open of the flap region.

First claim

1 . A pressure-release device having a pressure-release flap which is arranged in a delimiting wall of a chamber of an aircraft engine and which is designed to open in the presence of a predefined pressure in the chamber,
wherein the pressure-release flap comprises a flap region and a hinge, wherein
the flap region is defined by a perforation which is formed in the delimiting wall and which delimits the flap region with respect to a surrounding region of the delimiting wall,
the perforation is formed such that, in the presence of the predefined pressure in the chamber, the flap region pivots open relative to the surrounding region of the delimiting wall, with the perforation rupturing, and
the hinge is fixedly connected to the surrounding region of the delimiting wall and the flap region, such that the hinge holds the flap region on the surrounding region of the delimiting wall in the event of a rupture of the perforation and a pivoting-open of the flap region.

2 . The device according to claim 1 , wherein the perforation comprises a multiplicity of holes which are arranged in a line and which extend all the way through the delimiting wall.

3 . The device according to claim 2 , wherein the holes of the perforation have the same size and the same spacing to one another.

4 . The device according to claim 2 , wherein the holes of the perforation have a diameter which lies in the range between 50 μm and 2 mm.

5 . The device according to claim 1 , wherein the delimiting wall comprises multiple material layers, wherein the perforation extends through all of the material layers.

6 . The device according to claim 1 , wherein the hinge is composed of a different material than the delimiting wall.

7 . The device according to claim 1 , wherein the hinge has at least one material ply which is of areal form and which is connected on the one hand to the flap region and on the other hand to the surrounding region.

8 . The device according to claim 7 , wherein the material ply is in the form of an elongate material strip, wherein the material strip is connected, along one longitudinal edge thereof and adjacent thereto, to the flap region and, along the other longitudinal edge thereof and adjacent thereto, to the surrounding region, and wherein the flap region and the surrounding region are rectilinearly adjacent to one another in the portion that is covered by the elongate material strip.

9 . The device according to claim 7 , wherein the hinge has at least one material ply composed of a composite material.

10 . The device according to claim 9 , wherein the hinge has a material ply composed of an aramid-fiber-reinforced composite material.

11 . The device according to claim 1 , wherein the delimiting wall including the flap region is formed by a carbon-fiber-reinforced plastic or a glass-fiber-reinforced plastic.

12 . The device according to claim 9 , wherein the at least one material ply composed of a composite material and the delimiting wall have been cured simultaneously in a plastics matrix.

13 . The device according to claim 9 , wherein the at least one material ply composed of a composite material has been retroactively connected to the flap region and to the surrounding region of the delimiting wall.

14 . The device according to claim 1 , wherein the delimiting wall including the flap region is formed by a metal or a metal alloy.

15 . The device according to claim 1 , wherein the perforation also extends in that region of the delimiting wall in which the hinge is connected to the surrounding region of the delimiting wall and to the flap region, wherein the perforation is covered in this region by the hinge.

16 . The device according to claim 1 , wherein the hinge is formed on the inner side of the delimiting wall.

17 . The device according to claim 1 , wherein the pressure-release flap has the shape of a polygon, wherein the hinge is formed or arranged at one of the sides of the polygon, and the perforation runs along the sides of the polygon.

18 . The device according to claim 1 , wherein the pressure-release flap has a curved delimiting line, wherein the perforation runs in a curved manner.

19 . The device according to claim 1 , wherein the delimiting wall forms an outer surface of the chamber of the aircraft engine.

20 . An engine nacelle having a pressure-release device according to claim 1 , wherein the chamber is formed in the engine nacelle and the delimiting wall in which the pressure-release flap is formed forms an outer surface of the engine nacelle.

Assignees

• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• Todorovic Predrag

Classifications

• Y02T50/60

  Efficient propulsion technologies, e.g. for aircraft · CPC title

• F05D2270/09

  to cope with emergencies · CPC title

• F05D2260/606

  Bypassing the fluid · CPC title

• F02C9/18 Primary

  by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages {(F02C3/113 takes precedence)} · CPC title

• F02C7/18

  the medium being gaseous, e.g. air {(F02C7/125 takes precedence)} · CPC title