Device for activating a passive ejector valve for pressurising a turbojet engine chamber for an aircraft
AssigneeSnecma
InventorsGiuliana Elisa Rossi, Eddy Stéphane Joël Fontanel, Marie Gentilhomme
Life of this patent
Estimating the term…
Abstract
An apparatus for activating a valve of an ejector in order to adapt the pressurization of a chamber in an aircraft turbojet engine comprising a device constructed and arranged to trigger the opening and/or closing of valve and/or the power of the valve as a function of the altitude at which the valve is located.
Claims14
An activation apparatus for a valve of an ejector of a chamber in an aircraft turbojet engine, which chamber is capable of variable pressurization, the apparatus comprising a first device constructed and arranged to trigger the opening and/or closing of the valve as a function of a triggering threshold that varies according to the altitude at which the valve is located, so that the valve is either at a fully open position or at a fully closed position as a function of a triggering threshold determined by the altitude, the first device including a first inlet to receive ambient air and a second inlet to receive air drawn from a high-pressure compressor so that, in use, the air drawn from the high-pressure compressor is sent through the valve to the ejector to create a Venturi effect in an open position of the valve, and is blocked by the valve in a closed position of the valve, wherein the first device comprises:
- a multiplier element that is configured to receive the ambient air and the air drawn from the high-pressure compressor at its intake, said multiplier element adapted to modify a pressure of the air drawn from the high-pressure compressor;
- and
- an on-off check valve that is configured to receive the air supplied by the multiplier element at the modified pressure and the ambient air at its intake.
An activation apparatus for a valve of an ejector of a chamber in an aircraft turbojet engine, which chamber is capable of variable pressurization, the apparatus comprising a second device constructed and arranged to progressively open the valve as a function of the altitude at which the valve is located so that the valve is movable from a fully open position to a fully closed position, the valve assuming intermediate, partially open positions as a function of altitude, wherein the second device comprises a piston whose movement is controlled by a pressure of the ambient air, the movement of said piston is forming a passage, between the piston and a housing of the second device, having a profile that varies according to the pressure of the ambient air, which passage allows the air drawn from a high-pressure compressor to pass through the valve.
An activation apparatus for a valve of an ejector of a chamber in an aircraft turbojet engine, which chamber is capable of variable pressurization, the apparatus constructed and arranged to trigger the opening and/or closing of the valve as a function of a triggering threshold that varies according to the altitude at which the valve is located, the apparatus comprising:
- a pressure multiplier element that includes a first chamber with an inlet to receive air drawn from a high-pressure compressor, an outlet and a bellows system, said bellows system movable by pressure of ambient air exerted on the bellows system so that a movement of the bellows system in the first chamber modifies a pressure of the air drawn from the high-pressure compressor received by the inlet;
- and
- an on-off check valve constructed and arranged to control a supply of the air drawn from the high-pressure compressor to the ejector, the on-off check valve including a second chamber with an inlet to receive the air drawn from the high-pressure compressor, an outlet in communication with the ejector and a piston that is movable between a first position in which the outlet is blocked by the piston and a second position in which the outlet is in communication with the inlet of the second chamber to permit the air drawn from the high-pressure compressor and receive by the inlet of the second chamber to flow toward the ejector, a movement of the piston between the first and second positions determined by a difference in pressure between the ambient air and the modified pressure of the air drawn from the high-pressure compressor outputted by the pressure multiplier element.
An activation apparatus for a valve of an ejector of a chamber in an aircraft turbojet engine, which chamber is capable of variable pressurization, the apparatus constructed and arranged to progressively open the valve as a function of the altitude at which the valve is located, the apparatus comprising:
- a first chamber with an inlet to receive air drawn from a high-pressure compressor;
- a second chamber with an outlet in communication with the ejector, and
- a piston that is movable at a plurality of positions,
- wherein, in use, a passage is formed between the first and second chamber, said passage having a gradually variable section that is determined by a movement of the piston between a first position in which the passage is blocked and a second position in which the passage is open to permit the air drawn from the high-pressure compressor to flow from the inlet of the first chamber to the outlet of the second chamber.
Dependencies are inferred from the claim text.