A heterogeneous dual-redundancy engine fuel metering device

Abstract

The application belongs to the technical field of aero-engine fuel and control system, and relates to a heterogeneous dual-redundancy engine fuel metering device. The device comprises a main control unit, a backup unit and a differential pressure valve. The device realizes the heterogeneous dual-redundancy of the control unit through integration, effectively reduces the complexity of the structure, and realizes the smooth switching of the main control unit and the backup unit at any working state of the engine through the ingenious cooperation and action of the components. The device can realize both the electrical dual-redundancy closed-loop control and the manual mechanical backup control. The main control metering disc, the synchronous metering disc and the backup metering disc have the same structure size, and the main control shielding body and the backup shielding body also have the same structure size. The device has good versatility and excellent machining process, is easy to realize high-precision manufacturing, and ensures the quality consistency of the batch production of the parts. The metering windows are designed to be aligned and installed, which is easy to realize the overlapping requirement of the shielding body, and ensures the fuel metering accuracy of the main control unit and the backup control unit.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine fuel and control system technology, and relates to a fuel metering device for a heterogeneous dual-redundant engine. Background Technology

[0002] Fuel metering devices for aircraft engines typically employ a dual-redundancy design to ensure flight safety and reliability. Currently, fuel metering devices with mechanical backup generally consist of a main control unit comprised of a metering needle, drive element, and feedback element, which achieves closed-loop control with a digital electronic controller. The mechanical backup consists of a metering valve and a control lever, which enables manual open-loop control when the main control unit (failure) locks. The main control and backup units are independent and have good safety, but the manual operation of the mechanical backup has poor control quality, and the mechanical backup components have a complex structure, making design and manufacturing difficult and presenting a high technical threshold. Full-authority digital electronic control systems with electrical dual-redundancy fuel metering devices consist of metering components, drive elements, and feedback elements. The drive and feedback elements are isomorphic dual-redundant designs and serve as hot backups for each other, resulting in high control quality. However, the isomorphic dual-redundancy design means that the electronic controller's hardware and software, as well as the electromechanical and hydraulic components, share the same failure modes, leading to insufficient system fault tolerance. Furthermore, the shared metering component increases the structural complexity of the dual-redundant design of the metering component. Summary of the Invention

[0003] The purpose of this invention is to provide a heterogeneous dual-redundant engine fuel metering device that realizes the electrical dual-redundant heterogeneous design of the main control and backup units, reduces the complexity of the electrical dual-redundant structure, improves the system's fault tolerance, and ensures the quality of dual-redundant closed-loop control.

[0004] The technical solution of this invention is:

[0005] A heterogeneous dual-redundant engine fuel metering device includes a main control unit, a backup unit, and a differential pressure valve 10. The main control unit includes a main control metering disc 1, a synchronous metering disc 2, a main control shielding body 3, a main control gear transmission mechanism 4, and a main control drive feedback mechanism 5. The backup unit includes a backup metering disc 6, a backup shielding body 7, a backup gear transmission mechanism 8, and a backup drive feedback mechanism 9. The main control metering disc 1 and the synchronous metering disc 2 have the same structural dimensions, are arranged in series and aligned, and their windows are both negatively overlapped and covered by the main control shielding body 3. The main control drive feedback mechanism 5... The main control gear transmission mechanism 4 and the active shielding body 3 are connected in sequence; the backup metering disk 6 has the same structural dimensions as the main control metering disk 1 and the synchronous metering disk 2, and is arranged in series with the synchronous metering disk 2 and aligned in the opposite direction; the backup shielding body 7 covers the window of the backup metering disk 6 with zero overlap, and has zero overlap with the window of the synchronous metering disk 2; the backup drive feedback mechanism 9, the backup gear transmission mechanism 8, and the backup shielding body 7 are connected in sequence; the differential pressure valve 10 connects the two ends of the main control metering disk 1 and the synchronous metering disk 2, and connects to the two ends of the backup metering disk 6, and also connects to the low pressure chamber.

[0006] The main control shield 3 and the backup shield 7 have the same structural dimensions.

[0007] The main control shield 3 and the backup shield 7 have the same coverage area, or the coverage area of ​​the main control shield 3 is half that of the backup shield 7.

[0008] The area covered by the backup shield 7 is no less than twice the arc of the backup metering disk 6 window.

[0009] The main control metering disk 1, the synchronous metering disk 2, and the backup metering disk 6 have the same window size and are arranged in series with equal spacing. The windows of the main control metering disk 1 and the synchronous metering disk 2 have the same orientation, while the windows of the backup metering disk 6 have opposite orientations to the windows of the synchronous metering disk 2.

[0010] The main control shield 3 is a double fan-shaped structure. The two fan-shaped pieces have the same structural size, are coaxially connected and have their sides aligned. They are located between the main control metering disk 1 and the synchronous metering disk 2 and are coaxial with the main control metering disk 1 and the synchronous metering disk 2, respectively negatively overlapping and covering the windows of the main control metering disk 1 and the synchronous metering disk 2.

[0011] The backup shield 7 is a double-fan-shaped structure. The two fan-shaped pieces have the same structural size, are coaxially connected and have their sides aligned. They are located between the synchronization metering disk 2 and the backup metering disk 6 and are coaxial with the synchronization metering disk 2 and the backup metering window 6. One fan-shaped piece covers the window of the backup metering 6 with zero overlap, and the other fan-shaped piece has zero overlap with the window of the synchronization metering disk 2.

[0012] The main control gear transmission mechanism 4 is a sector gear meshing structure, and the main control drive feedback mechanism 5 is a stepper motor with angular displacement feedback.

[0013] The backup gear transmission mechanism 8 is a gear and rack meshing structure, and the backup drive feedback mechanism 9 is an electromechanical-hydraulic conversion component or a lever with linear displacement feedback. When the backup drive feedback mechanism 9 is an electromechanical-hydraulic conversion component with linear displacement feedback, it is controlled in a closed loop by a digital electronic controller. When the backup drive feedback mechanism 9 is a lever, it is controlled in an open loop by manual operation.

[0014] The differential pressure valve 10 connects the two ends of the main control metering disc 1 and the synchronous metering disc 2, and connects the two ends of the backup metering disc 6, so that the pressure difference between the fuel before metering and the fuel after metering is constant. At the same time, it connects to the low-pressure chamber and leads the differential pressure return oil to the low-pressure chamber.

[0015] The advantages of this invention are: compared with the prior art, the technical advantage of this invention lies in solving the structural complexity problem caused by the heterogeneous design of the main control and backup units with electrical dual redundancy. The main components of this invention, such as the main control metering disk 1, the synchronization metering disk 2, the backup metering disk 6, the main control shielding body 3, and the backup shielding body 7, adopt a homogeneous design. Through integration, the control unit achieves heterogeneous dual redundancy, effectively reducing structural complexity. At the same time, through the ingenious cooperation and action of the components, the smooth switching between the main control unit and the backup unit can be achieved in any operating state of the engine. It can realize both electrical dual redundancy closed-loop control and manual mechanical backup control.

[0016] The main control metering disk 1, synchronous metering disk 2, and backup metering disk 6 of this invention have the same window structure size, and the main control shielding body 3 and backup shielding body 7 can also have the same structure size. The components have simple structure, good versatility, and excellent processability, making it easy to achieve high-precision manufacturing and ensuring the quality consistency of mass production of parts. The aligned installation design of the metering windows makes the parts assembly process easy to achieve the required overlap of the shielding body, ensuring the fuel metering accuracy of the main and backup control units. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an embodiment of the heterogeneous electrical dual-redundancy fuel metering device of the present invention;

[0018] Figure 2 This is a schematic diagram of an embodiment of the fuel metering device with mechanical backup of the present invention;

[0019] Among them: 1-Main control metering panel, 2-Synchronous metering panel, 3-Main control shielding body, 4-Main control gear transmission mechanism, 5-Main control drive feedback mechanism, 6-Backup metering panel, 7-Backup shielding body, 8-Backup gear transmission mechanism, 9-Backup drive feedback mechanism, 10-Differential pressure valve. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0021] like Figure 1 Figure 2As shown, a heterogeneous dual-redundant engine fuel metering device includes a main control unit, a backup unit, and a differential pressure valve 10. The main control unit includes a main control metering disc 1, a synchronous metering disc 2, a main control shielding body 3, a main control gear transmission mechanism 4, and a main control drive feedback mechanism 5. The backup unit includes a backup metering disc 6, a backup shielding body 7, a backup gear transmission mechanism 8, and a backup drive feedback mechanism 9. The main control metering disc 1 and the synchronous metering disc 2 have the same structural dimensions and are arranged in series and aligned, with their windows negatively overlapped and covered by the main control shielding body 3. The main control drive feedback mechanism 5, the main control metering disc 1, the synchronous metering disc 2, the main control metering disc 1, the main control ...1, the main control metering disc 2, the main control metering disc 1, the main control metering disc 1, the main control metering disc 2, the main control metering disc 1, the main control metering disc 1, the main control metering disc 2, the main control metering disc 1, the main control metering disc 1, the main control metering disc 2, the main control metering disc 1, the main control metering disc 1, the main control metering disc 1, the main control metering disc 2, the main control metering disc 1 The control gear transmission mechanism 4 and the active shielding body 3 are connected in sequence; the window of the backup metering disk 6 has the same structural dimensions as the main control metering disk 1 and the synchronous metering disk 2, and is arranged in series and aligned in opposite directions with the synchronous metering disk 2; the backup shielding body 7 covers the window of the backup metering disk 6 with zero overlap, and has zero overlap with the window of the synchronous metering disk 2; the backup drive feedback mechanism 9, the backup gear transmission mechanism 8, and the backup shielding body 7 are connected in sequence; the differential pressure valve 10 connects the two ends of the main control metering disk 1 and the synchronous metering disk 2, and connects to the two ends of the window of the backup metering disk 6, and also connects to the low pressure chamber.

[0022] The main control shield 3 and the backup shield 7 have the same structural dimensions.

[0023] The main control shield 3 and the backup shield 7 have the same coverage area, or the coverage area of ​​the main control shield 3 is half that of the backup shield 7.

[0024] The area covered by the backup shield 7 is no less than twice the arc of the backup metering disk 6 window.

[0025] The main control metering disk 1, the synchronous metering disk 2, and the backup metering disk 6 have the same structural dimensions and are arranged in series at equal intervals. The window directions of the main control metering disk 1 and the synchronous metering disk 2 are the same, while the window directions of the backup metering disk 6 are opposite to those of the synchronous metering disk 2.

[0026] The main control shield 3 is a double fan-shaped structure. The two fan-shaped pieces have the same structural size, are coaxially connected and have their sides aligned. They are located between the main control metering disk 1 and the synchronous metering disk 2 and are coaxial with the main control metering disk 1 and the synchronous metering disk 2, respectively negatively overlapping and covering the windows of the main control metering disk 1 and the synchronous metering disk 2.

[0027] The backup shield 7 is a double-fan-shaped structure. The two fan-shaped pieces have the same structural size, are coaxially connected and have their sides aligned. They are located between the synchronization metering disk 2 and the backup metering disk 6 and are coaxial with the synchronization metering disk 2 and the backup metering disk 6. One fan-shaped piece covers the window of the backup metering disk 6 with zero overlap, and the other fan-shaped piece has zero overlap with the window of the synchronization metering disk 2.

[0028] The main control gear transmission mechanism 4 is a sector gear meshing structure, and the main control drive feedback mechanism 5 is a stepper motor with angular displacement feedback.

[0029] The backup gear transmission mechanism 8 is a gear and rack meshing structure, and the backup drive feedback mechanism 9 is an electromechanical-hydraulic conversion component or a lever with linear displacement feedback. When the backup drive feedback mechanism 9 is an electromechanical-hydraulic conversion component with linear displacement feedback, it is controlled in a closed loop by a digital electronic controller. When the backup drive feedback mechanism 9 is a lever, it is controlled in an open loop by manual operation.

[0030] Example 1:

[0031] The heterogeneous electrically redundant fuel metering device of the present invention includes a main control unit and a backup unit. The main control unit includes a main control metering disk 1, a synchronous metering disk 2, a main control double-sector-shaped baffle 3, a main control sector gear transmission mechanism 4, a stepper motor 5 with angular displacement feedback, and a differential pressure valve 10. The backup unit includes a backup metering disk 6, a backup double-sector-shaped baffle 7, a backup gear rack transmission mechanism 8, and an electromechanical-hydraulic conversion component 9 with linear displacement feedback. Figure 1 As shown.

[0032] The main control metering disk 1, synchronous metering disk 2, and backup metering disk 6 have the same structural dimensions, and their fan-shaped metering windows also have the same structural dimensions. They are arranged in series with equal spacing, with the windows of the main control metering disk 1 and synchronous metering disk 2 aligned, and the windows of the backup metering disk 6 and synchronous metering disk 2 aligned in opposite directions. Figure 1 As shown.

[0033] The two fan-shaped panels of the main control dual-fan-shaped shield 3 have the same structural dimensions, and the fan-shaped angle is not less than twice the arc of the metering window. The two fan-shaped panels are coaxially connected and their sides are aligned. They are located between the main control metering disk 1 and the synchronous metering disk 2 and are coaxial with both the main control metering disk 1 and the synchronous metering disk 2, respectively negatively overlapping and covering the windows of the main control metering disk 1 and the synchronous metering disk 2. The backup dual-fan-shaped shield 7 has the same structural dimensions as the main control dual-fan-shaped shield 3. It is located between the synchronous metering disk 2 and the backup metering disk 6 and is coaxial with both the synchronous metering disk 2 and the backup metering disk 6. One fan-shaped panel covers the window of the backup metering disk 6 with zero overlap, and the other fan-shaped panel has zero overlap with the window of the synchronous metering disk 2. Figure 1 As shown.

[0034] One sector gear of the main control sector gear transmission mechanism 4 is connected to the shaft of the main control double sector plate shield 3, and the other sector gear is connected to the shaft of the stepper motor 5 with angular displacement feedback; the two sector gears mesh. One sector gear of the backup gear rack transmission mechanism 8 is connected to the shaft of the backup double sector plate shield 7, and the other rack is connected to the electromechanical-hydraulic conversion component 9 with linear displacement feedback; the sector gear meshes with the rack. Figure 1 As shown.

[0035] The differential pressure valve 10 connects to both ends of the main control metering disc 1 and the synchronous metering disc 2, and also connects to both ends of the backup metering disc 6, keeping the pressure difference between the fuel before and after metering constant. Simultaneously, it connects to the low-pressure chamber, directing the differential pressure return oil to the low-pressure chamber. Figure 1 As shown.

[0036] When the main control unit is working, the stepper motor 5 with angular displacement feedback receives commands from the engine electronic controller. When the main control sector gear transmission mechanism 4 drives the main control double sector-shaped baffle 3 to rotate clockwise (facing the motor shaft end), the window openings of the main control metering disk 1 and the synchronous metering disk 2 increase synchronously. Before metering, fuel P1 flows through the main control metering disk 1 and the synchronous metering disk 2 in sequence with an increased flow rate, and after metering, fuel P2 goes to the combustion chamber. When the main control sector gear transmission mechanism 4 drives the main control double sector-shaped baffle 3 to rotate counterclockwise (facing the motor shaft end), the window openings of the main control metering disk 1 and the synchronous metering disk 2 decrease synchronously, reducing the flow rate of fuel P2 after metering. The stepper motor 5 with angular displacement feedback senses the rotation angle of the main control double sector-shaped baffle 3 through the main control sector gear transmission mechanism 4 and feeds it back to the electronic controller, realizing closed-loop control of the main control metered fuel. At this time, the backup metering window of the backup metering disk 6 is completely covered by the backup double sector-shaped baffle 7, and there is no fuel output from the backup metering window.

[0037] When the engine is in any operating state, the stepper motor 5 with angular displacement feedback is locked and switched to the backup unit. The electro-hydraulic conversion component 9 with linear displacement feedback receives instructions from the electronic controller. When it is necessary to increase the metered fuel, the backup gear and rack transmission mechanism 8 is driven to control the backup double-sector-shaped baffle 7 to rotate counterclockwise (facing the motor shaft end). The backup metering window opens, allowing the pre-metered fuel P1 to flow through the backup metering window. The backup metered oil P'2 merges with the metered oil P2 flowing through the main control metering disk 1 and the synchronous metering disk 2 in the locked state and then goes to the combustion chamber. When it is necessary to decrease the metered fuel, the backup gear and rack transmission mechanism 8 is driven to control the backup double-sector-shaped baffle 7 to rotate clockwise (facing the motor shaft end). The backup double-sector-shaped baffle 7 blocks the window of the synchronous metering disk 2 from the other side of the synchronous metering disk 2, thereby reducing the opening of the window of the locked synchronous metering disk 2 to reduce the flow rate of metered oil P2. The electro-hydraulic conversion component 9 with linear displacement feedback senses the rotation angle of the backup double-fan-shaped shield 7 via the backup gear rack transmission mechanism 8 and feeds it back to the electronic controller as a linear displacement signal. The electronic controller converts the linear displacement signal into an angular displacement signal and deducts the rotation angle of the main control double-fan-shaped shield 3 in the locked state, thereby realizing closed-loop control of the backup metering fuel.

[0038] Example 2:

[0039] The fuel metering device with mechanical backup of the present invention, compared with the heterogeneous electrical dual-redundancy fuel metering device, replaces the backup gear transmission mechanism with a backup sector gear transmission mechanism 8, and replaces the backup drive feedback mechanism with a control lever 9. One sector gear of the backup sector gear transmission mechanism 8 is connected to the control lever 9, such as... Figure 2 As shown.

[0040] The main control unit operates in the same way as in Example 1. During the operation of the backup unit, the backup shield 7, which was originally controlled in a closed loop by the electro-hydraulic conversion component with linear displacement feedback in Example 1 according to the electronic controller command, is now manually controlled in an open loop by the lever 9.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fuel metering device for a heterogeneous dual-redundancy engine, characterized in that, It includes a main control unit, a backup unit, and a differential pressure valve (10); the main control unit includes a main control metering disk (1), a synchronous metering disk (2), a main control shielding body (3), a main control gear transmission mechanism (4), and a main control drive feedback mechanism (5); the backup unit includes a backup metering disk (6), a backup shielding body (7), a backup gear transmission mechanism (8), and a backup drive feedback mechanism (9); the main control metering disk (1) and the synchronous metering disk (2) have the same structural dimensions, are arranged in series and aligned, and their windows are covered by the negative overlap of the main control shielding body (3); the main control drive feedback mechanism (5), the main control gear transmission mechanism (4), and the main control shielding body (3) are connected in sequence; the backup metering disk (6) has the same structural dimensions as the main control metering disk (1) and the synchronous metering disk (2), and is arranged in series and aligned in the opposite direction with the synchronous metering disk (2); the backup shielding body (7) covers the window of the backup metering disk (6) with zero overlap, and has zero overlap with the window of the synchronous metering disk (2); The backup drive feedback mechanism (9), the backup gear transmission mechanism (8), and the backup shield (7) are connected in sequence; the differential pressure valve (10) is connected to both ends of the main control metering disk (1) and the synchronous metering disk (2), and is also connected to both ends of the backup metering disk (6), while connecting to the low pressure chamber.

2. The fuel metering device for a heterogeneous dual-redundant engine according to claim 1, characterized in that, The main control shield (3) and the backup shield (7) have the same structural dimensions.

3. The fuel metering device for a heterogeneous dual-redundant engine according to claim 1, characterized in that, The coverage of the main control shield (3) and the backup shield (7) is the same or the coverage of the main control shield (3) is half that of the backup shield (7).

4. The fuel metering device for a heterogeneous dual-redundant engine according to claim 1, characterized in that, The area covered by the backup shield (7) is not less than twice the arc of the backup metering disk (6) window.

5. The fuel metering device for a heterogeneous dual-redundant engine according to claim 1, characterized in that, The main control metering disk (1), the synchronous metering disk (2), and the backup metering disk (6) have the same structural dimensions and are arranged in series at equal intervals. The window directions of the main control metering disk (1) and the synchronous metering disk (2) are the same, and the window directions of the backup metering disk (6) and the synchronous metering disk (2) are opposite.

6. The fuel metering device for a heterogeneous dual-redundant engine according to claim 1, characterized in that, The main control shield (3) is a double fan-shaped plate structure. The two fan-shaped plates have the same structural size, are coaxially connected and have their sides aligned. They are located between the main control metering plate (1) and the synchronous metering plate (2) and are coaxial with the main control metering plate (1) and the synchronous metering plate (2), respectively negatively overlapping and covering the windows of the main control metering plate (1) and the synchronous metering plate (2).

7. The fuel metering device for a heterogeneous dual-redundant engine according to claim 1, characterized in that, The backup shield (7) is a double fan-shaped structure. The two fan-shaped pieces have the same structural size, are coaxially connected and have their sides aligned. They are located between the synchronization metering disk (2) and the backup metering disk (6) and are coaxial with the synchronization metering disk (2) and the backup metering disk (6). One fan-shaped piece covers the window of the backup metering disk (6) with zero overlap, and the other fan-shaped piece has zero overlap with the window of the synchronization metering disk (2).

8. The fuel metering device for a heterogeneous dual-redundant engine according to claim 1, characterized in that, The main control gear transmission mechanism (4) is a sector gear meshing structure, and the main control drive feedback mechanism (5) is a stepper motor with angular displacement feedback.

9. The fuel metering device for a heterogeneous dual-redundancy engine according to claim 1, characterized in that, The backup gear transmission mechanism (8) is a gear and rack meshing structure, and the backup drive feedback mechanism (9) is an electromechanical-hydraulic conversion component or a lever with linear displacement feedback. When the backup drive feedback mechanism (9) is an electromechanical-hydraulic conversion component with linear displacement feedback, it is controlled in a closed loop by a digital electronic controller. When the backup drive feedback mechanism (9) is a lever, it is controlled in an open loop by manual operation.

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