A fuel control device for an electric main fuel pump

Abstract

The present invention provides a fuel control device for an electric main fuel pump, comprising a first fuel nozzle 2, a boost metering valve 4, a second fuel nozzle 5, a third fuel nozzle 7, a locking valve 9, a fourth fuel nozzle 10, a drain valve 12, a parking valve 13, a solenoid valve 14, an adjustable fuel nozzle assembly 15 and a fuel gear pump 17. Through autonomous speed regulation and electronic controller control, the solenoid valve 14, the adjustable fuel nozzle assembly 15, the parking valve 13, the boost metering valve 4, the locking valve 9 and the drain valve 12 cooperate to realize small flow oil return, real-time on-demand fuel supply and power-off parking protection; the third fuel nozzle 7, the locking valve 9, the fourth fuel nozzle 10, the drain valve 12, the parking valve 13 and the solenoid valve 14 cooperate to realize functions such as rapid response, stable operation, anti-surge and vibration elimination, etc., so as to finally achieve the purpose of effectively utilizing engine power, reducing the temperature rise of the fuel system and ensuring safe and reliable operation of the engine.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical hydraulics, and in particular to a fuel control device for an electric main fuel pump. Background Art

[0002] Existing fuel control devices usually use a gear pump as the main fuel pump and a regulator as the fuel supply adjustment device. Fuel control and adjustment are achieved through the coordinated work of a constant pressure valve, an electro-hydraulic servo valve, an oil return valve, a metering valve and a pressure differential valve. They have many parts, a complex structure, high power consumption and high temperature. Summary of the invention

[0003] The invention provides a fuel control device for an electric main fuel pump, which can realize functions such as fuel pressure boosting, small flow oil return, power failure parking, rapid response, stable operation and the like.

[0004] Technical solution: An electric main fuel pump fuel control device, including a first fuel nozzle 2, a boost metering valve 4, a second fuel nozzle 5, a third fuel nozzle 7, a locking valve 9, a fourth fuel nozzle 10, a drain valve 12, a parking valve 13, a solenoid valve 14, an adjustable fuel nozzle assembly 15 and a fuel gear pump 17, wherein:

[0005] The oil from the engine casing flows into the fuel gear pump 17 through the fuel main inlet 1. After being pressurized by the fuel gear pump 17, the fuel flows into the front chamber of the boost metering valve 4 and the first nozzle 2 in two ways. At the same time, a pre-metering pressure measuring point 16 is set after the fuel gear pump 17 is pressurized; the fuel flows into the rear chamber of the boost metering valve 4 through the first nozzle 2; the fuel in the rear chamber of the boost metering valve 4 is divided into three ways and flows into the spring chamber of the boost metering valve 4, the metering chamber of the locking valve 9 and the metering chamber of the drain valve 12 respectively; wherein, a second nozzle 5 is set between the rear chamber of the boost metering valve 4 and the spring chamber of the boost metering valve 4; at the same time, a temperature sensor 6 is set between the boost metering valve 4 and the locking valve 9; the metering chamber of the locking valve 9 communicates with the fuel main outlet 8, and the metering chamber of the drain valve 12 communicates with the locked oil return port 11; the spring chamber of the locking valve 9 is connected with the oil from the second type hole 19 of the parking valve 13 and the locked oil return port 11, respectively. A fourth nozzle 10 is arranged between the spring cavity of the locking valve 9 and the locking oil return port 11; the spring cavity of the drain valve 12 leads to the fifth type hole 22 from the parking valve 13; the fuel in the front cavity of the boost metering valve 4 is divided into four paths and flows into the comparison cavity of the boost metering valve 4, the adjustable nozzle assembly 15, the solenoid valve 14 and the parking valve 13 respectively, and the fuel in the front cavity of the boost metering valve 4 flows into the third type hole 20 and the fourth type hole 21 of the parking valve 13; a third nozzle 7 is arranged between the boost metering valve 4 and the parking valve 13; the fuel at the outlet of the adjustable nozzle assembly 15 is divided into two paths and flows into the solenoid valve 14 and the locking oil return port 11 respectively; the solenoid valve 14 transfers the fuel at the outlet of the adjustable nozzle assembly 15 or the fuel in the front cavity of the boost metering valve 4 to the comparison cavity of the parking valve 13 through its own switching by electronic control; the locking oil return port 11 communicates with the first type hole 18, the sixth type hole 23 and the spring cavity of the parking valve 13 respectively.

[0006] Specifically, the fuel gear pump 17 is implemented by an external meshing gear.

[0007] Specifically, an oil return hole is provided on the boost metering valve 4, and the flow area of ​​the adjustable oil nozzle is changed by adjusting the adjusting pin in the adjustable oil nozzle assembly 15; finally, the adjustable oil nozzle assembly 15 is adjusted to match the oil return hole opening of the boost metering valve 4 to achieve on-demand oil supply within 8% of the design flow point.

[0008] Specifically, the fuel boosting function: the fuel is boosted from the fuel tank through the pre-stage boost pump, reaches the main fuel pump main inlet 1, and after being boosted by the fuel gear pump 17, it flows to the boost metering valve 4.

[0009] Specifically, the fuel regulation function is: the fuel reaches the meter rear chamber from the meter front chamber through the metering hole of the boost metering valve 4. During normal operation, the solenoid valve 14 is energized, the control oil is cut off, the parking valve 13 compares the chamber to allow low-pressure oil to flow, the locking valve 9 spring chamber communicates with the low-pressure oil, and the locking valve 9 is opened; the drain valve 12 spring chamber communicates with high-pressure oil, and the drain valve 12 is closed. At this time, the fuel flows to the fuel main outlet 8 through the locking valve 9.

[0010] Specifically, the power-off parking function: when the solenoid valve 14 is powered off, the control oil is connected, the high-pressure oil is introduced into the comparison chamber of the parking valve 13, the spring chamber of the locking valve 9 communicates with the high-pressure oil, and the locking valve 9 is closed; the spring chamber of the drain valve 12 communicates with the low-pressure oil, the drain valve 12 is opened, and the fuel is now passed through the drain valve 12 to the locking oil return port 11.

[0011] Specifically, the small flow oil return function is realized by the cooperation of the boost metering valve 4 and the adjustable nozzle assembly 15. The flow rate of the adjustable nozzle is controlled by the adjusting pin in the adjustable nozzle assembly 15, and the matching control with the opening of the return oil type hole of the front cavity of the boost metering valve 4 is realized to realize the precise control requirement of the return oil flow rate. While meeting the small flow oil supply, the surplus flow fuel is realized to flow back to the locked return oil port 11, thereby reducing energy consumption.

[0012] Specifically, the quick response function: through the matching operation of the parking valve 13, the locking valve 9 and the fourth nozzle 10, the solenoid valve 14 is used to control the switching of the parking valve 13 comparison chamber to high-pressure oil when parking, and the low-pressure oil passing through the parking valve 13 to the spring chamber of the locking valve 9 is switched to high-pressure oil. Since the fourth nozzle 10 has a pressure stabilizing function, the fuel oil pressure balancing rate between the locking oil return port 11 and the spring chamber of the locking valve 9 is slowed down, thereby accelerating the response of the locking valve 9.

[0013] Specifically, stable working function: a third oil nozzle 7 and a fourth oil nozzle 10 are respectively provided between the front chamber of the boost metering valve 4 and the parking valve 13, and between the locking valve 9 and the locking oil return port 11, so as to slow down the pressure change rate, stabilize the flow, prevent pressure fluctuations, and improve the stable working performance.

[0014] In summary, the present invention proposes an electric main fuel pump fuel control system to address the shortcomings of existing aircraft engine fuel control systems, such as high power consumption, increased fuel temperature, and poor engine reliability. Through timely and autonomous speed adjustment of the electric main fuel pump, functions such as small flow return, power-off parking protection, and rapid response are realized, achieving the purpose of effectively utilizing engine power, reducing fuel system temperature rise, and ensuring safe and reliable operation of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention provides a structural schematic diagram of a fuel control device for an electric main fuel pump;

[0016] Figure 2 A structural schematic diagram of a parking valve is provided for the present invention;

[0017] Figure 3 A schematic diagram of the parking time at the point where the metered flow rate is 100% of the designed flow rate is provided for the present invention;

[0018] Figure 4 The present invention provides a schematic diagram of the parking time at a metering flow rate of 5% of the designed flow rate;

[0019] Among them, 1- fuel main inlet; 2- first fuel nozzle; 3- pressure measuring point after metering; 4- boost metering valve; 5- second fuel nozzle; 6- temperature sensor; 7- third fuel nozzle; 8- fuel main outlet; 9- locking valve; 10- fourth fuel nozzle; 11- locking oil return port; 12- oil drain valve; 13- parking valve; 14- solenoid valve; 15- adjustable fuel nozzle; 16- pressure measuring point before metering; 17- fuel gear pump; 18- first type hole; 19- second type hole; 20- third type hole; 21- fourth type hole; 22- fifth type hole; 23- sixth type hole DETAILED DESCRIPTION

[0020] like Figure 1-2 As shown, the present invention provides an electric main fuel pump fuel control device, comprising a first fuel nozzle 2, a boost metering valve 4, a second fuel nozzle 5, a third fuel nozzle 7, a locking valve 9, a fourth fuel nozzle 10, a drain valve 12, a parking valve 13, a solenoid valve 14, an adjustable fuel nozzle assembly 15 and a fuel gear pump 17, wherein:

[0021] The oil from the engine casing flows into the fuel gear pump 17 through the fuel main inlet 1. After being pressurized by the fuel gear pump 17, the fuel flows into the front chamber of the boost metering valve 4 and the first nozzle 2 in two ways. At the same time, a pre-metering pressure measuring point 16 is set after the fuel gear pump 17 is pressurized; the fuel flows into the rear chamber of the boost metering valve 4 through the first nozzle 2.

[0022] The fuel in the back chamber of the boost metering valve 4 is divided into three paths and flows into the spring chamber of the boost metering valve 4, the metering chamber of the locking valve 9 and the metering chamber of the drain valve 12. Among them, a second fuel nozzle 5 is arranged between the back chamber of the boost metering valve 4 and the spring chamber of the boost metering valve 4. At the same time, a temperature sensor 6 is arranged between the boost metering valve 4 and the locking valve 9;

[0023] The metering chamber of the locking valve 9 communicates with the fuel main outlet 8, and the metering chamber of the oil drain valve 12 communicates with the locking oil return port 11;

[0024] The spring chamber of the locking valve 9 is connected to the oil from the second hole 19 of the parking valve 13 and the locking oil return port 11, wherein a fourth oil nozzle 10 is arranged between the spring chamber of the locking valve 9 and the locking oil return port 11. The spring chamber of the drain valve 12 is connected to the fifth hole 22 from the parking valve 13;

[0025] The fuel in the front chamber of the boost metering valve 4 is divided into four paths and flows into the comparison chamber of the boost metering valve 4, the adjustable nozzle assembly 15, the solenoid valve 14 and the parking valve 13 respectively. The fuel in the front chamber of the boost metering valve 4 flows into the third type hole 20 and the fourth type hole 21 of the parking valve 13.

[0026] A third fuel nozzle 7 is arranged between the boost metering valve 4 and the parking valve 13 .

[0027] The outlet fuel of the adjustable nozzle assembly 15 is divided into two paths and flows into the solenoid valve 14 and the locking oil return port 11. The solenoid valve 14 delivers the fuel of the locking oil return port 11 or the fuel of the front chamber of the boost metering valve 4 to the comparison chamber of the parking valve 13 through electronic control switching.

[0028] The locking oil return port 11 is communicated with the first type hole 18 , the sixth type hole 23 and the spring chamber of the parking valve 13 respectively.

[0029] Specifically, the fuel gear pump 17 is implemented by an external meshing gear.

[0030] The first nozzle 2 and the second nozzle 5 ensure that the front chamber, the rear chamber and the spring chamber of the boost metering valve 4 communicate with each other, so as to achieve smooth oil passage, prevent the formation of dead chamber and ensure the normal operation of the fuel control device of the electric main fuel pump.

[0031] Specifically, an oil return hole is provided on the boost metering valve 4, and the flow area of ​​the adjustable oil nozzle is changed by adjusting the adjusting pin in the adjustable oil nozzle assembly 15. Finally, the oil supply on demand within 8% of the design flow point is achieved by adjusting the adjustable oil nozzle assembly 15 to match the oil return hole opening of the boost metering valve 4.

[0032] Specifically, the parking valve 13 adopts a two-position four-way structure to achieve rapid switching of high-pressure and low-pressure oil in the spring chambers of the locking valve 9 and the oil drain valve 12, with the high-pressure oil being no less than 10 MPa and the low-pressure oil being no more than 0.4 MPa.

[0033] Specifically, the third oil nozzle 7 is arranged between the solenoid valve 14 and the parking valve 13 ; and the fourth oil nozzle 10 is arranged between the locking valve 9 and the locking oil return port 11 .

[0034] It should be noted that the third oil nozzle 7 and the fourth oil nozzle 10 are provided to prevent the low-pressure oil from the locking oil return port 11 from flowing into the spring chamber of the locking valve 9 when the power is cut off and the vehicle is stopped, thereby delaying the parking response time. At the same time, the shut-off efficiency is improved by introducing high-pressure oil into the spring chamber of the locking valve 9 under the switching action of the parking valve 13, so that the power-off parking response time is not more than 120ms.

[0035] Specifically, the fuel boosting function: the fuel is boosted from the fuel tank through the pre-stage boost pump, reaches the main fuel pump main inlet 1, and after being boosted by the fuel gear pump 17, it flows to the boost metering valve 4.

[0036] Specifically, the fuel regulation function is: the fuel reaches the meter rear chamber from the meter front chamber through the metering hole of the boost metering valve 4. During normal operation, the solenoid valve 14 is energized, the control oil is cut off, the parking valve 13 compares the oil chamber to allow low-pressure oil to enter, the locking valve 9 spring chamber communicates with the low-pressure oil, and the locking valve 9 is opened; the drain valve 12 spring chamber communicates with high-pressure oil, and the drain valve 12 is closed. At this time, the fuel passes through the locking valve 9 to the fuel main outlet 8.

[0037] Specifically, the power-off parking function: when the solenoid valve 14 is powered off, the control oil is connected, the high-pressure oil is introduced into the comparison chamber of the parking valve 13, the spring chamber of the locking valve 9 communicates with the high-pressure oil, and the locking valve 9 is closed; the spring chamber of the drain valve 12 communicates with the low-pressure oil, the drain valve 12 is opened, and the fuel is now passed through the drain valve 12 to the locking oil return port 11.

[0038] Specifically, the small flow oil return function is realized by the cooperation of the boost metering valve 4 and the adjustable nozzle assembly 15. The adjustable nozzle flow rate is controlled by the adjusting pin in the adjustable nozzle assembly 15, and the matching control with the opening of the return oil type hole of the front cavity of the boost metering valve 4 is realized to achieve the precise control requirement of the return oil flow. While meeting the small flow oil supply, the surplus flow fuel is returned to the locked return oil port 11, reducing energy consumption.

[0039] Specifically, the quick response function: through the matching operation of the parking valve 13, the locking valve 9 and the fourth nozzle 10, the solenoid valve 14 is used to control the switching of the parking valve 13 comparison chamber to high-pressure oil when parking, and the low-pressure oil passing through the parking valve 13 to the spring chamber of the locking valve 9 is switched to high-pressure oil. Since the fourth nozzle 10 has a pressure stabilizing function, the fuel oil pressure balancing rate between the locking oil return port 11 and the spring chamber of the locking valve 9 is slowed down, thereby accelerating the response of the locking valve 9.

[0040] Specifically, stable working function: a third oil nozzle 7 and a fourth oil nozzle 10 are respectively provided between the front chamber of the boost metering valve 4 and the parking valve 13, and between the locking valve 9 and the locking oil return port 11, so as to slow down the pressure change rate, stabilize the flow, prevent pressure fluctuations, and improve the stable working performance.

[0041] In practical applications, the present invention provides an electric main fuel pump fuel control device. At maximum flow rate, the time from the solenoid valve 14 being powered off to the pressure of the fuel main outlet 8 changing from high pressure (not less than 10MPa) to low pressure (not greater than 0.4MPa) is no more than 0.2s.

[0042] From the time when the electronic controller sends a stop command to the time when the pressure at the total fuel outlet 8 changes from high pressure (not less than 10MPa) to low pressure (not more than 0.4MPa), the realization of the parking function requires the coordinated work of the solenoid valve 14, the parking valve 13, the locking valve 9, the drain valve 12 and the third fuel nozzle 10.

[0043] Given a metering flow rate of 100% of the design flow rate point, the solenoid valve is powered off after 5s. The simulation results are as follows: Figure 3 As shown. Figure 3 It can be seen that the time from the solenoid valve being powered off to the total fuel outlet pressure changing from high pressure to low pressure is 55ms, which meets the index requirements.

[0044] Given a metering flow rate of 5% of the design flow rate, the solenoid valve is powered off after 5s. The simulation results are as follows: Figure 4 As shown. Figure 4 It can be seen that the time from the solenoid valve being powered off to the total fuel outlet pressure changing from high pressure to low pressure is 120ms.

[0045] The present invention is mainly used in front of the fuel regulator of a certain engine accessory. Through autonomous speed regulation and electronic controller control, it realizes functions such as real-time on-demand fuel supply, parking protection, rapid response, stable operation, anti-surge and vibration elimination, etc., so as to achieve the purpose of effectively utilizing engine power, reducing the temperature rise of the fuel system, and ensuring safe and reliable operation of the engine.

Claims

1. A fuel control device for an electric main fuel pump, characterized in that: The invention comprises a first fuel nozzle (2), a boost metering valve (4), a second fuel nozzle (5), a third fuel nozzle (7), a locking valve (9), a fourth fuel nozzle (10), a drain valve (12), a parking valve (13), a solenoid valve (14), an adjustable fuel nozzle assembly (15) and a fuel gear pump (17), wherein: The fuel oil from the engine casing flows into the fuel gear pump (17) through the fuel main inlet (1). After being pressurized by the fuel gear pump (17), the fuel oil flows into the front meter cavity of the boost metering valve (4) and the first nozzle (2) in two ways. At the same time, a front metering pressure measuring point (16) is set after the fuel gear pump (17) is pressurized. The fuel oil flows into the rear meter cavity of the boost metering valve (4) through the first nozzle (2). The fuel oil in the rear meter cavity of the boost metering valve (4) flows into the spring cavity of the boost metering valve (4), the metering cavity of the locking valve (9) and the oil drain valve (1) in three ways. 2) a metering chamber; wherein a second oil nozzle (5) is arranged between the metering rear chamber of the boost metering valve (4) and the spring chamber of the boost metering valve (4); a temperature sensor (6) is arranged between the boost metering valve (4) and the locking valve (9); the metering chamber of the locking valve (9) communicates with the fuel main outlet (8), and the metering chamber of the drain valve (12) communicates with the locking oil return port (11); the spring chamber of the locking valve (9) is connected to the oil from the second type hole (19) of the parking valve (13) and the locking oil return port (11), wherein the locking valve (9) is connected to the second type hole (19) of the parking valve (13) and the locking oil return port (11), respectively. A fourth oil nozzle (10) is arranged between the spring chamber of the lock valve (9) and the lock oil return port (11); the spring chamber of the oil discharge valve (12) leads to a fifth-shaped hole (22) from the parking valve (13); the fuel in the metering front chamber of the boost metering valve (4) flows into the comparison chamber of the boost metering valve (4), the adjustable oil nozzle assembly (15), the solenoid valve (14) and the parking valve (13) in four ways respectively, and the fuel in the metering front chamber of the boost metering valve (4) flows into the third-shaped hole (20) and the fourth-shaped hole (21) of the parking valve (13); wherein the fuel in the metering front chamber of the boost metering valve (4) flows into the third-shaped hole (20) and the fourth-shaped hole (21) of the parking valve (13); A third oil nozzle (7) is arranged between the valve (4) and the parking valve (13); the outlet fuel of the adjustable oil nozzle assembly (15) is divided into two paths and flows into the solenoid valve (14) and the locking oil return port (11) respectively; wherein the solenoid valve (14) transmits the outlet fuel of the adjustable oil nozzle assembly (15) or the fuel in the metering front chamber of the boost metering valve (4) to the comparison chamber of the parking valve (13) through the electronic control of its own switching; the locking oil return port (11) is communicated with the first type hole (18), the sixth type hole (23) and the spring chamber of the parking valve (13) respectively; The fuel gear pump (17) is implemented by using an external meshing gear; An oil return hole is provided on the boost metering valve (4), and the flow area of ​​the adjustable oil nozzle is changed by adjusting the adjusting pin in the adjustable oil nozzle assembly (15); finally, the oil return hole opening of the adjustable oil nozzle assembly (15) is adjusted to match the design, so as to realize on-demand oil supply within 8% of the design flow point.

2. The electric main fuel pump fuel control device according to claim 1, characterized in that: Fuel boosting function: The fuel is boosted from the fuel tank through the pre-stage boost pump and reaches the fuel main inlet (1). After being boosted by the fuel gear pump (17), the fuel flows to the boost metering valve (4).

3. The fuel control device of the electric main fuel pump according to claim 1, characterized in that: Fuel regulation function: The fuel flows from the meter front chamber to the meter rear chamber through the metering hole of the boost metering valve (4). During normal operation, the solenoid valve (14) is energized, the control oil is cut off, low-pressure oil flows into the comparison chamber of the parking valve (13), the spring chamber of the locking valve (9) communicates with the low-pressure oil, and the locking valve (9) opens; the spring chamber of the drain valve (12) communicates with the high-pressure oil, and the drain valve (12) is closed. At this time, the fuel flows through the locking valve (9) to the fuel main outlet (8).

4. The fuel control device of the electric main fuel pump according to claim 1, characterized in that: Power-off parking function: When the solenoid valve (14) is powered off, the control oil is connected, the comparison chamber of the parking valve (13) is connected to high-pressure oil, the spring chamber of the locking valve (9) communicates with the high-pressure oil, and the locking valve (9) is closed; the spring chamber of the drain valve (12) communicates with low-pressure oil, the drain valve (12) is opened, and the fuel is then passed through the drain valve (12) to the locking oil return port (11).

5. The fuel control device of the electric main fuel pump according to claim 1, characterized in that: The small flow oil return function is realized by the cooperation of the boost metering valve (4) and the adjustable nozzle assembly (15). The adjustable nozzle flow rate is controlled by the adjusting pin in the adjustable nozzle assembly (15), and the matching control with the opening of the oil return hole of the front chamber of the boost metering valve (4) is realized to achieve the precise control requirement of the oil return flow rate. While meeting the small flow oil supply, the surplus flow fuel is realized to flow back to the locked oil return port (11), thereby reducing energy consumption.

6. The fuel control device of the electric main fuel pump according to claim 1, characterized in that: Quick response function: by matching the parking valve (13), the locking valve (9) and the fourth nozzle (10), when the vehicle is parked, the solenoid valve (14) is used to control the switching of the parking valve (13) comparison chamber to high-pressure oil, and the low-pressure oil passing through the parking valve (13) to the locking valve (9) spring chamber is switched to high-pressure oil. Since the fourth nozzle (10) has a pressure stabilizing function, the fuel oil pressure balancing rate between the locking oil return port (11) and the locking valve (9) spring chamber is slowed down, thereby accelerating the response of the locking valve (9).

7. The fuel control device of the electric main fuel pump according to claim 1, characterized in that: Stable working function: A third oil nozzle (7) and a fourth oil nozzle (10) are respectively arranged between the front chamber of the boost metering valve (4) and the parking valve (13), and between the locking valve (9) and the locking oil return port (11), so as to slow down the pressure change rate, stabilize the flow, prevent pressure fluctuations, and improve stable working performance.

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