The invention relates to an oxygen breathing device for an aircraft, in particular for oxygen supply to crew member in a cockpit of an aircraft, comprising a filter unit having an inflow port and an outflow port, the filter unit being adapted to extract nitrogen from an air flow flowing from the inf
The invention relates to an oxygen breathing device for an aircraft, in particular for oxygen supply to crew member in a cockpit of an aircraft, comprising a filter unit having an inflow port and an outflow port, the filter unit being adapted to extract nitrogen from an air flow flowing from the inflow port to the outflow port through the filter unit, wherein the filter unit is adapted to receive compressed air, preferably, bleed air from a precompressor stage of a turbine driving the aircraft, or directly by a separate electrically driven compressor, via a bleed air supply line connected to the inflow port, a first pressure regulator in the bleed air supply line, a first water separator which is arranged in the bleed air supply line in flow direction of the bleed air before the first pressure regulator and a connection port which can be brought in fluid communication with said outflow port of the filter unit and which is adapted to be coupled to at least one oxygen supply mask via an oxygen supply line. According to the invention, a chemical oxygen generator comprising at least one substance adapted to produce oxygen in a chemical reaction and to provide said oxygen to an outflow port of said oxygen generator is provided. The outflow port of said chemical oxygen generator is connected to an auxiliary oxygen supply line and a control unit is adapted to selectively provide oxygen from the filter unit or the chemical oxygen generator to an oxygen supply mask coupled to the connection port.
대표청구항▼
1. Oxygen breathing device for an aircraft, in particular for oxygen supply to crew member in a cockpit of the aircraft, comprising: a filter unit having an inflow port and an outflow port, the filter unit being adapted to extract nitrogen from an air flow flowing from the inflow port to the outflow
1. Oxygen breathing device for an aircraft, in particular for oxygen supply to crew member in a cockpit of the aircraft, comprising: a filter unit having an inflow port and an outflow port, the filter unit being adapted to extract nitrogen from an air flow flowing from the inflow port to the outflow port through the filter unit,wherein the filter unit is adapted to receive compressed bleed air via a bleed air supply line from a precompressor stage of a turbine driving the aircraft connected to the inflow port, or directly by a separate electrically driven compressor,a first pressure regulator in the bleed air supply linea first water separator which is arranged in the bleed air supply line in flow direction of the bleed air before the first pressure regulator,a connection port which can be brought in fluid communication with said outflow port of the filter unit and which is adapted to be coupled to at least one oxygen supply mask via an oxygen supply line, wherein: a chemical oxygen generator comprising at least one substance adapted to produce oxygen in a chemical reaction and to provide said oxygen to an outflow port of said oxygen generator,a starter adapted to start said chemical reaction upon receipt of a start signal, preferably an electrical start signal, wherein the outflow port of said chemical oxygen generator is connected to an auxiliary oxygen supply line, a control unit adapted to selectively provide oxygen from the filter unit or the chemical oxygen generator to the at least one oxygen supply mask coupled to the connection port. 2. The oxygen breathing device according to claim 1, further comprising a shut off valve to interrupt flow through the bleed air supply line, the shut off valve being preferably arranged in bleed air flow direction between the first water separator and the first pressure regulator. 3. The oxygen breathing device according to claim 2, wherein the shut off valve comprises a first valve unit adapted to interrupt the flow through the bleed air supply line and a second valve unit adapted to interrupt flow through a vent line connecting the filter unit with ambient pressure, wherein the first valve unit is adapted to be switched between a first condition wherein the flow through the bleed air supply line is open and the flow through the vent line is open and a second position wherein the flow through the bleed air supply line is shut and the flow through the vent line is shut. 4. The oxygen breathing device according to claim 1, further comprising a pressure sensor and an oxygen sensor, wherein the pressure sensor and the oxygen sensor are arranged in the oxygen supply line and the control unit is adapted to monitor signals of the pressure sensor and the oxygen sensor and to provide an output signal indicating proper function of the oxygen breathing device, in particular to provide such output signal after a certain predetermined time period has elapsed after the pressure sensor signal had reached a predetermined limit and the oxygen sensor signal has reached a predetermined limit. 5. The oxygen breathing device according to claim 4, further comprising a monitor line connecting the outflow port of the filter unit to a calibrated orifice and allowing a permanent small oxygen flow through the oxygen sensor, wherein the oxygen sensor monitors the oxygen concentration of the permanent small oxygen flow and outputs an oxygen signal to the control unit, said control unit comparing said oxygen signal to a predetermined value and putting out a signal of proper function or malfunction of the oxygen breathing device, wherein the monitor line is connected to the oxygen supply line in flow direction before the pressure sensor and behind the oxygen sensor. 6. The oxygen breathing device according to claim 1, further comprising a second water separator which is arranged in the bleed air supply line between the first pressure regulator and the inflow port of the filter unit. 7. The oxygen breathing device according to claim 1, further comprising an oxygen sensor monitoring the oxygen flow to the connection port of the oxygen breathing device, the oxygen sensor being connected to the control unit, wherein the control unit is adapted to compare an oxygen sensor signal to a predetermined desired minimum oxygen level and to activate the starter of the chemical oxygen generator if the oxygen flow falls below said level. 8. The oxygen breathing device according to claim 1, further comprising and a box for storing the at least one oxygen mask, wherein a switch is arranged at the box the switch being coupled to the control unit to activate oxygen supply if the at least one oxygen mask is taken out of the box. 9. The oxygen breathing device according to claim 1, further comprising an oxygen source select valve, said oxygen source select valve comprising a first input port coupled to said chemical oxygen generator via said auxiliary oxygen supply line, a second input port coupled to said filter unit via said oxygen supply line and an output port in fluid communication with said connection port, wherein the oxygen source select valve is adapted to selectively provide oxygen from the first input port or from the second input port to the output port.
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이 특허에 인용된 특허 (6)
Gupta Alankar (Seattle WA) McGrady Michael B. (Federal Way WA) Tedor John B. (San Antonio TX), Breathing system for high altitude aircraft.
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