JP3948067B2 - Afterburner fuel shut-off device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an afterburner system for an aircraft gas turbine engine, and more particularly to an afterburner fuel cutoff device that can easily shut off afterburner fuel.
[0002]
[Prior art]
In aircraft gas turbine engines and jet engines, refuel with an afterburner to temporarily increase thrust, such as sudden acceleration, and shut off the fuel supply from the afterburner fuel supply pump when restoring the thrust. As a result, the outflow of the afterburner fuel to the engine was stopped. In order to realize this, a mechanism for blocking the pump inlet channel has been provided.
[0003]
FIG. 3 is a block diagram of the afterburner system of this aircraft gas turbine engine, which branches from the engine fuel inlet to the afterburner fuel pump 12 via the main fuel pump 10 and the fuel shutoff valve 11. After the fuel is supplied and fuel is metered by the main fuel metering mechanism 13 from the main fuel pump 10, the fuel is supplied to the engine main combustor. The fuel from the afterburner fuel pump 12 is the afterburner / local fuel metering mechanism 14, afterburner / The fuel is branched and supplied to the core fuel metering mechanism 15 and the afterburner / fan fuel metering mechanism 16, where the fuel is metered separately and then supplied to the afterburner combustor.
[0004]
In order to shut off the afterburner fuel, the fuel is not discharged from the afterburner fuel pump 12 and the fuel shutoff valve 11 is closed.
[0005]
[Problems to be solved by the invention]
However, in order to shut off the afterburner fuel, the fuel supplied to the pump must be stopped. Therefore, it was not possible to use other than the independent afterburner fuel pump 12 dedicated to the afterburner. Further, since the fuel is shut off by the fuel shut-off valve 11 at the inlet of the pump 12, the fuel downstream of the pump may flow out.
[0006]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an afterburner fuel shut-off device that solves the above-described problems and can easily supply and shut off afterburner fuel.
[0007]
[Means for Solving the Problems]
To achieve the above object, the invention according to claim 1, in afterburner fuel cutoff apparatus that performs blocking the supply of afterburner fuel, and connect to branch the main combustor line and afterburner combustor line to the fuel pump, the The main fuel metering mechanism is connected to the main combustor line, and the afterburner / local fuel metering mechanism, the afterburner / core fuel metering mechanism, and the afterburner / fan fuel metering mechanism are connected to the afterburner combustor line, respectively. The afterburner fuel shut-off valve is connected to the downstream side of the metering mechanism, the afterburner / core fuel metering mechanism, and the afterburner / fan fuel metering mechanism, and the afterburner fuel shutoff valve is connected to each afterburner fuel shutoff valve. A servo valve having a nozzle flapper that opens and closes by supplying fuel oil for control is connected, and the nozzle flapper includes a nozzle that injects fuel and a flapper that closes the nozzle, and the afterburner fuel supply to the torque motor of the flapper When an electric signal for shutoff is input, the flapper is swung, and the nozzle is converted into a hydraulic signal corresponding to the electric signal to operate the servo valve, and the control fuel oil from each servovalve is used to shut off each afterburner fuel This is an afterburner fuel cutoff device that is supplied to the valve and opens and closes each of the afterburner fuel cutoff valves simultaneously .
[0009]
According to a second aspect of the invention, the servo valve has a spool valve, hydraulic signal at the nozzle flapper, with afterburner fuel cutoff apparatus according to claim 1, wherein by operating the spool valve to open and close the afterburner fuel shutoff valve is there.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0011]
First, an afterburner system for an aircraft gas turbine engine will be described with reference to FIG.
[0012]
The fuel from the engine fuel inlet is branched by the fuel pump 20 into the main combustor line 21 and the afterburner combustor line 22. After the main fuel metering mechanism 23 is connected to the main combustor line 21 and the fuel is metered, It is supplied to the engine main combustor and burned.
[0013]
The fuel supplied from the fuel pump 20 to the afterburner combustor line 22 is supplied to the afterburner / local fuel metering mechanism 24, the afterburner / core fuel metering mechanism 25, and the afterburner / fan fuel metering mechanism 26, and is metered separately. The fuel is supplied to the afterburner combustor via the fuel cutoff valves 27, 28 and 29, respectively.
[0014]
The fuel cutoff valves 27, 28, and 29 are opened and closed by a single servo valve 30, and the fuel cutoff valve is input to the servo valve 30 by inputting an opening / closing electric signal 32. 27, 28, and 29 are opened and closed.
[0015]
Details of the fuel cutoff valves 27, 28, 29 and the servo valve 30 will be described with reference to FIG.
[0016]
FIG. 1 shows a servo valve 30 and a pressure control valve 31 as the fuel cutoff valves 27, 28 and 29.
[0017]
The servo valve 30 converts an electric signal 32 into a hydraulic signal, a nozzle flapper 33 that converts the input electric signal 32 into a hydraulic signal, and a spool valve 34 that switches a circuit with the converted hydraulic signal of the nozzle flapper 33. Consists of
[0018]
The nozzle flapper 33 is connected from a high-pressure line 35 of fuel via an orifice 36, and is swung by a torque motor 38 such as a DC electromagnetic coil, which injects fuel depressurized by the orifice 36. The flapper 39 is located and closes the nozzle opening.
[0019]
In the spool valve 34, a spool 41 is slidably provided in a sleeve 40, a high pressure chamber 42 connected to a high pressure line 35 is formed in one of the spools 41, and the other is a nozzle line on the downstream side of the orifice 36. A pressure regulating chamber 44 connected to 43 is formed. The pressure adjusting chamber 44 is provided with a spool seat 45 that receives the spool 41 and a spring 46 that biases the spool 41 toward the high-pressure chamber 42.
[0020]
The sleeve 40 has a high pressure port h connected to the high pressure line 35, a low pressure port l connected to the low pressure line 47, and an output port o. The output port o and the pressure control valve 31 are connected by a control line 48. The
[0021]
A valve portion 41a that partitions the high pressure port h and the low pressure port 1 is formed at the end of the spool 41 on the high pressure chamber 42 side, and an introduction portion 41b is formed in the middle.
[0022]
The pressure control valve 31 shows only the afterburner local fuel cutoff valve 27 in the figure, but the core and fan fuel cutoff valves 28 and 29 have the same structure. Further, the reason for branching into the three systems is that the fuel measurement amounts are different.
[0023]
The pressure control valve 31 includes a valve sleeve 50 having an introduction port 49 into which fuel from a fuel metering mechanism is introduced, and a fuel outlet port 51 formed in the valve sleeve 50 so as to be slidable. A throttling piston 52 that opens and closes and a reset piston 53 that is inserted into the throttling piston 52 and drives the throttling piston 52, and a coil spring 54 is provided between the throttling piston 52 and the reset piston 53. Further, the reset piston 53 is provided with a coil spring 55 that urges the reset piston 53 toward the throttling piston 52.
[0024]
A control port 57 that introduces fuel oil from the control line 48 into the chamber 56 on the back side of the reset piston 53 and a fuel oil for control that opens and closes the throttle ring piston 52 when the afterburner is operated are introduced into the valve sleeve 50. A port 58 and a high-pressure port 59 for introducing fuel oil having substantially the same pressure as the fuel oil in the high-pressure line 35 are provided. The throttling piston 52 has an introduction port 61 that opens into a pressure chamber 60 formed by the reset piston 53. Is formed.
[0025]
Reference numeral 63 denotes a cap of the valve sleeve 50, and 62 denotes a spring seat provided in the chamber 56 on the back side of the reset piston 53.
[0026]
Next, the operation of the present invention will be described.
[0027]
First, as shown in FIG. 2, the fuel such as JP-4 is boosted by the fuel pump 20 from the engine fuel inlet, and the fuel is metered by the main fuel metering mechanism 23 from the main combustor line 21. It is supplied to the vessel and burned.
[0028]
The remainder is supplied from an afterburner combustor line 22 to an afterburner / local fuel metering mechanism 24, an afterburner / core fuel metering mechanism 25, and an afterburner / fan fuel metering mechanism 26. It is supplied to the afterburner combustor via valves 27, 28 and 29.
[0029]
FIG. 1 shows a state in which afterburner combustion is being performed. In this state, the pressure control valve 31 has its reset piston 53 in the position shown in the figure, and the fuel from the inlet 49 flows to the fuel outlet port 51. Supply to the afterburner combustor.
[0030]
At this time, in the servo valve 30, the high-pressure fuel oil from the high-pressure line 35 is decompressed through the orifice 36, and the fuel oil is injected from the nozzle 37. In the spool valve 34, the high-pressure fuel oil from the high-pressure line 35 is introduced into the high-pressure chamber 42, and the spool 41 is in a position seated on the spool seat 45. In this state, the low-pressure fuel oil from the low-pressure line 47 is low-pressure port. From 1 to the inlet 41 b of the spool 41, flows to the control line 48 through the output port o, and is introduced from the control port 57 of the pressure control valve 31 into the chamber 56 on the back side of the reset piston 53. Since the pressure of the fuel oil introduced into the chamber 56 is sufficiently lower than the pressure of the fuel introduced from the introduction port 58, the reset piston 53 is held at the position shown in the figure, and afterburner combustion is performed.
[0031]
When shutting off the afterburner combustion, the electric signal 32 is sent to the torque motor 38 of the nozzle flapper 33 so that the flapper 39 swings so as to close the nozzle opening of the nozzle 37. As a result, the flow of fuel oil from the high pressure line 35 through the orifice 36 is cut off, the nozzle line 43 on the downstream side of the orifice 36 becomes the same as the pressure in the high pressure line 35, and the pressure acts on the pressure adjusting chamber 44. Since the same high pressure acts on both ends of the spool 41, the spool 41 is moved to the left as viewed in the figure by the force of the spring 46. As a result, the low pressure port l is closed and the high pressure port h and the output port o connected to the high pressure line 35 are closed. Are connected via the introduction part 41 b, and high-pressure fuel oil flows into the control line 48.
[0032]
The high-pressure fuel oil that has flowed into the control line 48 is introduced from the control port 57 into the chamber 56 on the back side of the reset piston 53. As a result, the reset piston 53 moves to the left and moves the throttling piston 52 to the left. Moving. The fuel outlet port 51 is closed by the movement of the throttling piston 52.
[0033]
In this way, the electric signal 32 is input to the torque motor 38, converted into a hydraulic signal, and the spool valve 34 is operated by this hydraulic signal, thereby servoing the pressure control valve 31 downstream of the afterburner fuel metering valve. The fuel supply to the afterburner combustor can be shut off by closing the valve 30 in accordance with the electrical command to the valve 30.
[0034]
In addition, since one of the servo valves 30 shuts off the fuel shut-off valves 27, 28, 29, it is possible to shut off fuel to the local, core, and fan segments at the same time when a malfunction occurs during engine operation. .
[0035]
When the fuel supply to the afterburner combustor is performed again after the fuel is shut off, an electric signal 32 is sent to the servo valve 30, and the flapper 37 is returned so that the fuel oil is again ejected from the nozzle 37, thereby controlling the pressure with the spool valve 34. The valve 31 can return to the state of FIG. 1 again and supply fuel to the afterburner combustor.
[0036]
【The invention's effect】
In short, according to the present invention, an electric signal is input to the servo valve and converted into a hydraulic signal, and the fuel shut-off valve downstream of the afterburner fuel metering valve is shut off with this signal, so that the hydraulic mechanism has high reliability. The mechanism can make full use of In addition, afterburner combustion can be stopped by a fuel pump that also serves as a main, not a pump dedicated to the afterburner, and the degree of freedom in the configuration of the pump system can be increased.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a main part showing an embodiment of the present invention.
FIG. 2 is an overall schematic view of an afterburner system according to the present invention.
FIG. 3 is a schematic diagram of a conventional afterburner system.
[Explanation of symbols]
20 Fuel pump 21 Main combustor line 22 Afterburner combustor line 23 Main fuel supply mechanism 24, 25, 26 Afterburner fuel supply mechanism 27, 28, 29 Afterburner fuel shutoff valve 30 Servo valve 33 Nozzle flapper

Claims (2)

In an afterburner fuel shut-off device that supplies and shuts off afterburner fuel, the main combustor line and the afterburner combustor line are branched and connected to the fuel pump, and the main fuel metering mechanism is connected to the main combustor line, afterburner combustion Afterburner / local fuel metering mechanism, afterburner / core fuel metering mechanism, afterburner / fan fuel metering mechanism, and afterburner / local fuel metering mechanism, afterburner / core fuel metering mechanism, afterburner / fan fuel metering mechanism Afterburner fuel shut-off valves are connected to the downstream of the nozzles, and each of the afterburner fuel shut-off valves is supplied with control fuel oil to the afterburner fuel shut-off valves to open and close the nozzle flats. The nozzle flapper is composed of a nozzle that injects fuel and a flapper that closes the nozzle, and an electric signal for supplying and shutting off the afterburner fuel is input to the torque motor of the flapper to shake the flapper. The servo valve is operated by converting it into a hydraulic signal corresponding to the electrical signal at the nozzle, and the fuel oil for control is supplied from the servo valve to each afterburner fuel shutoff valve for each afterburner fuel shutoff. An afterburner fuel shut-off device characterized by opening and closing valves simultaneously . Servo valve has a spool valve, hydraulic signal at the nozzle flapper, afterburner fuel cutoff apparatus according to claim 1, wherein by operating the spool valve to open and close the afterburner fuel shutoff valve.

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