| 摘要 |
#CMT# #/CMT# The system has mechanical fingers (11, 21, 31) provided for control valves (1, 2, 3) respectively. The mechanical fingers are displaced from a retracted position to a deployed position, upon the command of respective mechanical control units (51, 52, 53) associated to the valves. The fingers allow the complete opening of the valves in the retracted position. The fingers limit the opening of the valves, in the deployed position, when the units (51 - 53) determine that the pressure difference between the interior and the exterior of an aircraft cabin exceeds a preset value. #CMT#USE : #/CMT# Used for pressuring an aircraft cabin (claimed). #CMT#ADVANTAGE : #/CMT# The mechanical control units spontaneously deploy the mechanical fingers, in case the pressure difference between the interior and the exterior of the aircraft cabin exceeds the preset value, such that the complete opening of the control valves is mechanically impossible, in case of defect of safety units or electric controls and/or engine actuators and hence consequences of the defect are avoided. The system therefore permits to regulate the pressure inside the aircraft cabin and to manage critical conditions by using the control valves secured by the fingers which do not lead to brutal and rapid depressurization of the cabin, while permitting to use functionalities of electric systems. The system permits to eliminate pneumatic safety valves and check valves, without affecting the safety of the aircraft, passengers and crew persons. The system is simple, of lightweight, and limits the number of openings on the structure of the aircraft, while conforming to standards imposed by certifying organizations. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic representation of an aircraft cabin pressurization system. 1 - 3 : Control valves 4 : Main control unit 5, 6 : Security units 10, 20, 30 : Engine actuators 11, 21, 31 : Mechanical fingers 51 - 53 : Mechanical control units. |
