JPS6125599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an air mixing device for high pressure air and low pressure air.
Although not particularly limited, it is installed between a jet engine of a marine aircraft and an air conduit for air conditioning, and has a step-like flow path area ratio in order to adjust the mixing of low pressure air and high pressure air taken in from the jet engine. Related to exhaust precooler.

Traditionally, the compressor section of jet engine marine aircraft has been used to supply energy in the form of compressed air to indoor air conditioning systems. This compressed air is usually called “bleed air” (supply air).
Air is supplied from air supply ports provided at various compression stages in the multi-stage compression section of the engine. In order to provide sufficient supply air within the entire operating range of the marine aircraft, high pressure air supply ports are used. Since the temperature of the supply air is very high relative to the indoor air conditioner, some kind of pre-cooling means is required for the supply air. This cooling is typically accomplished using a plate-fin heat exchanger. Cooling supply air is sent out from the low-pressure air supply port of the engine compressor, passes through the heat exchanger, and is discharged from the ship's aircraft. The use of indoor high pressure supply air and the use of low pressure supply air for pre-cooling are
This has an adverse effect on the overall operating conditions of the engine in that it increases the fuel consumption per unit of thrust utilized in the marine aircraft.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air mixing device for high-pressure air and low-pressure air from a jet engine, which can significantly reduce the above-mentioned defects.

The above deficiencies of the prior art can be minimized by removing air from the low pressure stage of the engine or by eliminating the exhaust of the precooled supply air, both of which features are embodied in the present invention.

The conventional pressurization device for the cabin of a ship's aircraft is covered by a U.S. patent no.
No. 3441045, No. 3367256, No. 3367355, No.
It is disclosed in the specifications of No. 3842720 and No. 3711044. None of the environmental control or pressurization systems in these patents disclose the features and advantages of the present invention.

The present invention provides an air mixing device that utilizes a multi-nozzle mixing and exhaust device that is suitable for pre-cooling and flow requirements by mixing low-pressure air with high-pressure air through the suction pump action obtained by the jetting of high-pressure air nozzles. It is something to do. Control of these nozzles provides a suitable mixture of high pressure air and low pressure air to meet the air flow requirements necessary for the air conditioning of the marine aircraft during operation of the marine aircraft.

The exhaust system that mixes high pressure air and low pressure air taken out from the jet engine constitutes an air supply system that takes air from two air sources in the engine compressor section and uses the low pressure air source for takeoff. , pre-cooling the high pressure air sent to the air mixing device during lift and normal cruise operation. High pressure air is utilized to pump low pressure air to the air mixing device at low engine power levels. By utilizing a suitable mixture of high pressure air and low pressure air, the efficiency of use of a jet engine can be increased.

Furthermore, the air mixing device of the present invention has a plurality of nozzles having openings of different cross-sectional areas to provide a stepped flow area ratio between high pressure air and low pressure air. These nozzles can be opened and closed to provide the proper temperature and pressure to the air within the air conditioner.

The air mixing device of the present invention mixes high pressure air and low pressure air from a jet engine and introduces this mixed air into the air conduit of the air conditioning device of a marine aircraft. It has a low pressure air supply pipe connected to it. One end of a high pressure air supply pipe is connected to the high pressure air supply port of the jet engine. An air mixing chamber having an inlet is connected to the other end of the low pressure air supply pipe. This air mixing chamber is
It has an inlet portion with a reduced cross-sectional area forming a bench lily portion on the inside. This vent lily part is connected to an enlarged outlet part whose cross-sectional area expands outwardly, which outlet part is connected to an air conduit. A high pressure air supply bypass pipe is connected to the high pressure air supply pipe and the air conduit. A bypass valve is provided in the high pressure air supply bypass pipe. A plurality of nozzles that eject high pressure air are connected to the nozzle valve. These nozzle valves are connected to high pressure air supply pipes. The ends of these nozzles are arranged inside the inlet of the air mixing chamber. A temperature control device is connected to the nozzle valves to open and close the nozzle valves. This temperature control device is connected to a bypass valve and opens and closes this bypass valve. A temperature sensor is connected to the air conduit, and the temperature sensor is connected to and operates the temperature control device.

The advantages and objects of the present invention will become apparent from the following description, taken in conjunction with the accompanying drawings which illustrate preferred embodiments.

As shown in FIG. 1, an air mixing device 10 for mixing high pressure air and low pressure air according to the present invention is connected to a jet engine 12 of a marine aircraft, and
It is connected to an air conduit 14 that forms part of the air conditioning system of the ship's aircraft.

The air mixing device 10 has a low pressure supply pipe 16 connected to a low pressure air supply 18 of the jet engine. High pressure air supply port 22 of jet engine 12
A high pressure air supply pipe 20 is connected to. In order to prevent the high-pressure air supplied to the high-pressure air supply pipe 20 from flowing back into the low-pressure air supply pipe 16 through the air mixing device 10, the low-pressure air supply pipe 16 is provided with a check valve 24. The low-pressure air supply pipe 16 has an air mixing chamber 28 having a shape in which the cross-sectional area is reduced inward.
It is connected to the inlet section 26 of the. The air mixing chamber 28 has a bench lily portion 30 and an outlet portion 32 whose cross-sectional area expands outward. This outlet 32 is connected to the air conduit 14.

The high-pressure air supply pipe 20 includes a first nozzle valve, a second nozzle valve, and a third nozzle valve, and these nozzle valves 34 are shown as a whole rectangular. These first nozzle valve, second nozzle valve, and third nozzle valve are connected to the first nozzle 36, second nozzle 38, and third nozzle 40, respectively. The ends of the first nozzle 36 , the second nozzle 38 , and the third nozzle 40 are arranged in a bundle, and the center of this bundle arrangement is at the inlet 2 of the mixing chamber 28 .
It coincides with the central axis of 6. High pressure air supply bypass pipe 42 is connected to high pressure air supply pipe 20 and air conduit 14 . The bypass valve 44 is provided in the middle of the bypass pipe 42.

A temperature sensor 46 is attached to the air conduit 14 . This temperature sensor 46 is connected by a tube 48 to a temperature control device 50 . This temperature control device 5
0 is connected to the nozzle valve 34 and the bypass valve 44 by means of pipes 52 and 54 to open and close the nozzle valve 34 and the bypass valve 44.
4 and a bypass valve 44.

In FIG. 2, a cross section of the inlet portion 26 of the air mixing chamber 28 is shown as a cross section taken along line 2--2 in FIG. As shown, the ends of first nozzle 36, second nozzle 38, and third nozzle 40 have different cross-sectional areas. The cross-sectional area of the opening 56 of the first nozzle 36 is the third
It is smaller than the opening 58 of the nozzle 40. Similarly, the cross-sectional area of opening 58 is smaller than opening 60 of second nozzle 38 . By varying the size of these openings, different stepped flow area ratios can be provided for high pressure air mixing with low pressure air, and different stepped flow rate ratios can be obtained for proper temperature control.
The first nozzle 36, second nozzle 38, and third nozzle 40 are opened and closed sequentially or in various combinations to obtain the desired air mixture.

Temperature sensor 4 that senses the temperature inside the air conduit 14
6 operates a temperature control device 50 that increases or decreases the temperature of the mixed air of high pressure air and low pressure air. The temperature control device 50 is operated and controlled by the temperature sensor 46 to open and close the plurality of nozzle valves 34, and controls the first nozzle 36,
The amount of high pressure air in the second nozzle 38 and the third nozzle 40 is adjusted. a nozzle valve 34 and a first nozzle 36;
A bypass pipe 42 connected around the second nozzle 38 and the third nozzle 40 connects directly to the air conduit 14 when precooling of the high pressure air is not required or when the high pressure air is needed to start another jet engine. Used to supply high pressure air. A temperature control device 50 controlled and operated by a temperature sensor 46 is connected to a bypass valve 4.
It also has the function of opening and closing 4.

Although three nozzles are shown in Figures 1 and 2 for mixing high pressure air with low pressure air, if more precise high and low pressure air mixing, temperature control and flow regulation are required, more than two nozzles may be used. Of course, you can use . Also, the first nozzle 36 and the second nozzle 38
The ends of the third nozzle 40 and the third nozzle 40 are bundled together, and their centers are aligned with the central axis of the inlet 26 to achieve good air mixing. It is important to suction air.

The air mixing device 10 is controlled by the air temperature in the air conduit 14, in which a minimum and maximum limit temperature is set for the air conditioning device. When the engine is idling or taxiing onto or off the runway at low power, the temperature of the supply air drops below the minimum limit temperature and the temperature sensor 46 operates to close the bypass valve 44. The open nozzle valve 34 will be closed. If the engine is operating at takeoff power, the high pressure air will reach a temperature above the maximum limit temperature. Therefore, the temperature control device 50 is actuated by the temperature sensor 46, closes the bypass valve 44, and opens all nozzle valves 34, thereby directing high pressure air to the first nozzle 36, the second nozzle 38, and the third nozzle 4.
It will supply all of 0. If temperature sensor 4
6 still senses a temperature above the maximum limit, temperature controller 50 sequentially closes two of the nozzles and allows high pressure air to flow into the low pressure air stream from only one remaining nozzle. The airflow temperature within the air conduit 14 will therefore be between the maximum and minimum limit temperatures.

When the aircraft reaches its normal cruising altitude, the high-pressure and low-pressure air mixture reaches its minimum temperature limit and another nozzle opens to mix the high-pressure air with the low-pressure air. When the marine aircraft ascends from the cruising altitude, the mixed air temperature will again reach the lowest critical temperature due to the low temperature of the surroundings, at which point the third nozzle 40 will be opened.

When the ship aircraft descends, the jet engine will be throttled down to the descending power and will reach the minimum temperature limit again.
The temperature control device 50 therefore closes the nozzle valve 34;
Bypass valve 44 is opened to allow high pressure air to flow directly into air conduit 14 . The above-described continuous operation of opening and closing of bypass valve 44 and nozzle valve 34 operated by temperature control device 50 provides the desired flow rate and pressure within a predetermined temperature limit range.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an air mixing device according to the present invention that mixes high pressure air and low pressure air from a jet engine and introduces this mixed air into the air conditioning system of a marine aircraft; FIG. FIG. 2 is a cross-sectional view of the air mixing chamber taken along line 2-2 of FIG. 1; 12...Jet engine, 14...Air conduit, 16...Low pressure air supply pipe, 18...Low pressure air supply port, 20...High pressure air supply pipe, 22...High pressure air supply port, 24...Return check Valve, 26...inlet part,
28... Air mixing chamber, 30... Bench lily section, 3
2... Outlet part, 34... Nozzle valve, 36, 38,
40... Nozzle, 42... High pressure air supply bypass pipe, 44... Bypass valve, 46... Temperature sensor,
50... Temperature control device, 56, 58, 60... Nozzle opening.

Claims (1)

[Scope of Claims] 1. An air mixing device that mixes high-pressure air and low-pressure air from a jet engine of a marine aircraft and introduces the mixed air into an air conduit of an air conditioning system of a marine aircraft, comprising: A low-pressure air supply pipe whose one end is connected to the low-pressure air supply port of the engine, a high-pressure air supply pipe whose one end is connected to the high-pressure air supply port of the jet engine, and a high-pressure air supply pipe whose other end is connected to the low-pressure air supply pipe. an air mixing chamber having an inlet and an outlet connected to the air conduit; a high pressure air supply bypass pipe connected to the high pressure air supply pipe and the air conduit; and a high pressure air supply bypass pipe provided in the high pressure air supply bypass pipe. a bypass valve; a plurality of nozzles having an end connected to a plurality of nozzle valves connected to the other end of the high pressure air supply pipe and disposed within the air mixing chamber for mixing high pressure air with low pressure air; a temperature control device connected to the nozzle valve to open and close the nozzle valve, and a temperature control device connected to the bypass valve to open and close the bypass valve; and a temperature control device connected to the air conduit to sense the temperature of the mixed air; An air mixing device for high-pressure air and low-pressure air from a jet engine, comprising: a temperature sensor connected to a temperature sensor to operate the temperature control device; 2. The air mixing device according to claim 1, wherein the ends of the plurality of nozzles are arranged in a bundle on the same central axis as the inlet of the air mixing chamber. 3. The air mixing chamber has a bench lily portion provided between an inlet portion and an outlet portion of the mixing chamber, the inlet portion has a cross-sectional area that decreases inwardly toward the bench lily portion, and the outlet portion has a The air mixing device according to claim 1, wherein the cross-sectional area increases from the bench lily portion. 4. The openings at the ends of the plurality of nozzles have different cross-sectional areas, and when the nozzles are opened and closed, the openings at the ends of the plurality of nozzles provide a stepped flow area ratio of high-pressure air mixed with low-pressure air. Air mixing device as described in section. 5. The air mixing chamber has an inlet section connected to the other end of the low-pressure air supply pipe and whose cross section is reduced inward to form a bench lily section, and the bench lily section has an outlet section whose cross section is enlarged outwardly. the plurality of nozzles are connected to a first nozzle valve, a second nozzle valve, and a third nozzle valve, respectively connected to the high-pressure air supply pipe; The air mixing device according to claim 1, comprising a first nozzle, a second nozzle and a third nozzle, the ends of these nozzles being arranged in the air mixing chamber for mixing high pressure air with low pressure air. Device. 6. The air mixing device according to claim 5, wherein the ends of the first nozzle, second nozzle, and third nozzle are arranged in a bundle on the same central axis as the inlet of the air mixing chamber. 7 The openings at each end of the first nozzle, second nozzle, and third nozzle have different cross-sectional areas, and when these nozzles are opened and closed, a stepped flow path of high-pressure air mixed with low-pressure air is formed. An air mixing device according to claim 1, which provides an area ratio.