JPH0661367B2 - Anti-saution valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a breathing regulator of an oxygen generator mounted on an aircraft.

(Prior art and problems to be solved) Oxygen generator (OBOGS ON BOARD) mounted on an aircraft
OXYGEN GENERATING SYSTEM) often uses compressed air generated in connection with the operation of the engine.

The operation of the oxygen generator that uses air (hereinafter referred to as engine bleed air) that extracts a portion of the compressed air generated by starting the engine depends on the operating state of the engine, and it is possible to maintain a good and constant state at all times. Not necessarily.

In extreme cases, no air is supplied to the mask, so it is possible to remove the mask.

Since a handset or the like may be provided in association with the mask, it is not preferable to take off the mask even before the engine is started.

Therefore, suffocation prevention measures (ANTI SUFFOCATION MEANS) are required to prevent suffocation without removing the mask.

An object of the present invention is to provide an anti-sufficiency valve (ANTI SUFFOCA) of an oxygen generator capable of supplying stable intake air even when the extraction pressure is zero or extremely low.
TION VALVE).

(Means for Solving the Problems) In order to achieve the above-mentioned object, an anti-sufficiency valve of an oxygen generator according to the present invention is configured to connect an extraction pressure to a concentrator to connect oxygen-rich air to a mask to generate oxygen. In the breathing regulator of the device, the intake regulator is provided with a valve for supplying air in the cabin to an air supply path to the mask, and means for detecting pressure supplied to the regulator and pressure inside the cabin,
The valve is configured to open when the pressure supplied to the regulator is below a certain value and the pressure inside the cabin is above a certain value.

(Example) Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of an anti-sufficiency valve of a breathing regulator of an oxygen generator.

FIG. 2 is a block diagram of an oxygen supply system mounted on an aircraft to which the present invention is applied.

The air (hereinafter referred to as engine bleed air) obtained by extracting a part of the compressed air generated by starting the engine is connected to a concentrator 99 that generates air containing abundant oxygen.

The front seat regulator 100 includes the concentrator 99.
Output air and oxygen from the backup oxygen system 98 are connected.

The backup oxygen system 98 is usually formed by an oxygen cylinder, and is automatically or selectively used by the backup oxygen switching unit 104 of the front seat regulator 100 when the concentrator 99 and its series have some inconvenience. Is.

The front seat regulator 100 includes the concentrator 99.
There are provided a concentration controller 101 for controlling the oxygen concentration from the above and an oxygen concentration monitor 102 for measuring the oxygen concentration.

The mode selector 103 uses an operation mode that does not use the backup oxygen (backup off), a mode that automatically selects and uses the backup oxygen and air from the concentrator (auto or normal mode), and a mode that uses only the backup oxygen system 98 ( Manually set the 3 modes of backup on).

The backup oxygen switching unit 104 is the mode selector 103.
The signal from produces the condition of the valve. The breathing regulator 105 is a regulator that adjusts the air from the backup oxygen switching unit 104 to a pressure suitable for supplying the mask 120.

The output of the backup oxygen switching unit 104 is branched to the rear seat regulator 110.

The shut-off valve 111 is installed in the rear seat regulator 110.
A breathing regulator 112 having the same structure as the breathing regulator 105 described above is provided.

The shutoff valve 111 is a valve that is manually opened and closed, and the breathing regulator 112 is a mask for the other mask 12.
1 is connected.

The anti-suction valve of the oxygen generator according to the present invention is provided in each of the breathing regulators 105 and 112.

Respiratory regulator 10 because both have the same structure
The embodiment provided in FIG. 5 will be described with reference to FIG.

The detection and valve container 1 is a chamber A that forms a container for the altitude detection unit in the cabin by the diaphragms 5 and 6 for the rubber partition walls, a chamber B that forms a container for the regulator inlet pressure sensing unit, and a chamber C that forms a valve chamber. It is divided into rooms.

The diaphragm 5 for the partition wall and the diaphragm 6 for the partition wall are hermetically fixed to the shaft 7a and the shaft 7b, respectively.

The chamber A is connected to the inside of the cabin through an opening on the upper surface, and the chamber A is provided with multistage vacuum diaphragms 3, 4 ... Which drive the shaft 7a.

When the pressure in the chamber A drops, the vacuum diaphragms 3, 4
Expands and pushes down the shaft 7a.

A part of the inlet pressure of the breathing regulator 105 is connected to the B chamber. The flange 8b fixed to the upper end of the shaft 7b which is airtightly fixed to the diaphragm 6 for the partition wall faces the flange 8a fixed to the lower end of the shaft 7a in the B chamber.

When the pressure in the chamber B reaches the normal inlet pressure of the breathing regulator 105, the diaphragm 6 for the partition wall moves down and pushes down the shaft 7b.

The chamber C of the detection and valve container is communicated with the breathing gas passage 2 through the opening 2a.

A valve seat 11 is provided in the opening 2a,
The valve 10 is associated with the valve seat 11.

The valve 10 is fixed to the shaft 7b and is biased in the opening direction by a spring 9.

Cabin air intake windows 12 and 13 are provided in the room C, and filters 14 and 15 are provided respectively in the cabin air intake windows 12 and 13.

Before starting the engine of the aircraft on the ground, A
Since the vacuum diaphragms 3 and 4 of the chamber do not extend, the shaft 7
a is not pushed down.

Further, since the extraction pressure has not been generated because the engine has not been started and the regulator inlet pressure is zero (concentrator 99 is not operating), the shaft 7b is not pushed down and the valve 10 is in the open state shown in the drawing.

Therefore, the opening 2a of the breathing gas passage 2 communicates with the cabin, and the mask 120 is supplied with the cabin air.

After the engine is started, the bleed pressure rises, the regulator inlet pressure rises, and the pressure inside the B chamber rises, the shaft 7b and the valve 10 are pushed down integrally and the spring 9 is pushed to open the opening 9a.
Close. The mask 120 is supplied with conditioned oxygen-rich air from the concentrator 99.

Furthermore, the altitude in the cabin is, for example, 7.200 ft (21
94m), the vacuum diaphragms 3 and 4 extend to close the opening 9a. Then, only air from the breathing gas passage 2 is supplied to the mask 120.

(Effects of the Invention) As described in detail above, the anti-sufficiency valve of the oxygen generator according to the present invention includes a valve for supplying cabin air to the respiratory regulator and an air supply path to the mask. A means for detecting the pressure supplied and the pressure inside the cabin is provided, and the valve is opened when the pressure supplied to the regulator is below a certain value and the pressure inside the cabin is above a certain value. It is configured.

Therefore, the valve provided on the breathing regulator
The air in the cabin is supplied until the engine bleed pressure rises to the pressure necessary for the pilot's breathing, and when the air pressure in the cabin is low, it is automatically controlled not to accept the air in the cabin. .

Therefore, the pilot can receive an appropriate intake air supply without removing the mask under any condition.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an anti-sufficiency valve of an oxygen generator according to the present invention. FIG. 2 is a block diagram showing the overall configuration of the oxygen generator. 1 ... Detection and valve container 2 ... Breathing gas passage 3, 4 ... Vacuum diaphragm 5, 6 ... Diaphragm for diaphragm 7a, 7b ... Shaft 8a, 8b ... Shaft flange 9 ... Spring 10 ... Valve 11 ... Valve seat 12,13 ... Cabin air intake window 14,15 ... Filter 98 ... Backup oxygen system 99 ... Concentrator 100 ... Front seat regulator 101 ... Concentration controller 102 ... Oxygen concentration monitor 103 ... … Mode selector 104 …… Backup oxygen switching unit 105 …… Breathing regulator 110 …… Rear seat regulator 111 …… Shut-off valve 112 …… Breathing regulator 120,121 …… Mask

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideto Nakatsuji, C-302 Mitsui Town, Kakamigahara City, Gifu Prefecture C-302 (72) Hiroshi Kawai, 1 Kawasaki Town, Kakamigahara City, Gifu Prefecture Kawasaki Heavy Industries Ltd. Gifu Factory ( 72) Inventor Seiichi Watanabe 1-35-1 Izumihonmachi, Komae City, Tokyo Tokio Aviation Instrument Co., Ltd. (56) Reference JP-A-56-143178 (JP, A) European Patent Application Publication 263677 (EP, A)

Claims (1)

[Claims] 1. A breathing regulator of an oxygen generator for connecting an extraction pressure to a concentrator to connect air rich in oxygen to a mask, wherein the breathing regulator is provided with cabin air in an air supply path to the mask. A valve for supplying and a means for detecting the pressure supplied to the regulator and the pressure inside the cabin are provided, the pressure supplied to the regulator is below a certain value, and the pressure inside the cabin is above a certain value. In this case, the anti-sufficiency valve of the oxygen generator is characterized in that the valve is opened at this time.