A multi-oil circuit switching device for switching synchronization

Abstract

This invention belongs to the field of structural design technology and discloses a multi-oil circuit switching device for switching synchronization, including: a metering upper chamber switching bushing, a metering upper chamber switching valve, a metering upper chamber spring, a metering upper chamber spring seat, a metering upper chamber end cover, a metering lower chamber bushing, a metering lower chamber valve, a metering lower chamber gasket, and a metering lower chamber end cover; the upper chamber switching valve and the lower chamber switching valve are arranged in a linear layout and mechanically locked together. When the control oil pushes the metering lower chamber valve to move, the metering upper chamber that is mechanically locked together also moves accordingly, ensuring that the two valves are completely synchronized, avoiding the occurrence of multiple failures and ensuring the stability of engine fuel metering.

Description

Technical Field

[0001] This invention belongs to the field of structural design technology, and in particular relates to a multi-oil circuit switching device for switching synchronization. Background Technology

[0002] To meet the thermal management and weight requirements of aero engines, the hot return oil control electro-hydraulic servo valve is generally used as a backup control for the main fuel metering in the engine fuel control design. At this time, a switching structure is required for switching. The input of the switching valve has one switching control oil circuit, one low-pressure oil circuit, and four metering valve position control oil circuits; the output has four metering valve servo oil circuits, for a total of at least 10 oil circuits.

[0003] The multiple oil passages of the switching valve result in an excessively long valve, numerous seals, and a large length-to-diameter ratio, making machining and assembly difficult. To reduce machining and assembly difficulties while ensuring the synchronicity of the two switching valves, the oil passages of the two switching valves are symmetrically distributed to solve the asynchrony problem. However, due to issues such as the housing oil passage design and fuel flow rate, the actual operation of the product cannot guarantee complete synchronization of the two valves, causing a brief dead zone in one chamber of the metering valve, which affects the fuel metering flow rate of the engine. Summary of the Invention

[0004] This invention proposes a multi-oil circuit switching device for switching synchronization, which is convenient for processing and assembly. The multi-oil circuit switching is designed as a double switching valve. In order to ensure the complete synchronization of the two switching valves and avoid multiple failures, the two switching valves are arranged in a straight line in terms of structural layout, with mechanical stop. The control oil uses the same oil circuit to drive the valve action, thus ensuring that the switching of the two valves is completely synchronized from the structure.

[0005] To achieve the above objectives, the present invention employs the following technical solution.

[0006] A multi-oil circuit switching device for switching synchronization, the device comprising: a metering upper chamber switching bushing 1, a metering upper chamber switching valve 2, a metering upper chamber spring 3, a metering upper chamber spring seat 4, a metering upper chamber end cover 5, a metering lower chamber bushing 6, a metering lower chamber valve 7, a metering lower chamber gasket 8, and a metering lower chamber end cover 9.

[0007] The metering upper cavity conversion bushing 1, metering upper cavity conversion valve 2, metering lower cavity bushing 6, and metering lower cavity valve 7 are all cylindrical structures;

[0008] The metering upper cavity conversion bushing 1 contains a metering upper cavity conversion valve 2. The left end of the metering upper cavity conversion valve 2 is connected to the metering upper cavity end cover 5 through the metering upper cavity spring 3 and the metering upper cavity spring seat 4.

[0009] The lower metering chamber bushing 6 contains a lower metering chamber valve 7, and the right end of the lower metering chamber conversion valve 7 is connected to the lower metering chamber end cover 9 through a lower metering chamber gasket 8.

[0010] The features and further improvements of the technical solution of this invention are as follows:

[0011] (1) The metering upper chamber conversion valve 2 and the metering lower chamber valve 7 are linear stop valves, and the stop points are connected to the oil return port.

[0012] (2) The control oil circuit of the metering upper cavity conversion bushing 1 is two inlet and two outlet, including: main valve oil inlet 1, backup valve oil inlet 1, main valve outlet 1, backup valve outlet 1, and return oil 1.

[0013] (3) The metering lower chamber bushing 6 has a four-inlet and two-outlet control oil circuit, including: main valve oil inlet 2, backup valve oil inlet 2, constant pressure oil inlet, control oil inlet, main valve outlet 2, backup valve outlet 2.

[0014] (4) When the main valve is working normally, the control oil inlet is low pressure oil, the metering upper chamber switching valve 2 and the metering lower chamber valve 7 do not operate, the main valve oil inlet 1 and the main valve outlet 1 communicate, the backup valve oil inlet 1 and the backup valve outlet 1 communicate, the main valve oil inlet 2 and the main valve outlet 2 communicate, and the backup valve oil inlet 2 and the backup valve outlet 2 communicate.

[0015] (5) When the main valve fails and needs to be switched, the control oil inlet pressure increases, which pushes the metering lower chamber valve 7 to move. The metering upper chamber switching valve 2 that is attached to it also moves, connecting the backup valve oil inlet 1 with the main valve outlet 1 and the backup valve oil inlet 2 with the main valve outlet 2, thus ensuring the stability of the oil supply to the main valve outlet 1 and the main valve outlet 2.

[0016] (6) The main valve outlet 1 supplies fuel to the main fuel metering valve, and the backup valve outlet 1 supplies hot return oil metering valve.

[0017] (7) The main valve outlet 2 supplies fuel to the main fuel metering valve, and the backup valve outlet 2 supplies hot return oil metering valve.

[0018] To avoid processing and assembly difficulties, two switching valves are used instead when there are multiple switching valve oil circuits. To ensure the synchronization of the two switching valves, the two oil circuits passing through the control chambers of the two switching valves are distributed as symmetrically as possible. The technical solution of this invention breaks the traditional symmetrical oil circuit layout. The two switching valves adopt a linear layout with rigid support and use the same control oil circuit, ensuring that the two switching valves switch simultaneously and completely synchronously, avoiding the occurrence of multiple failures and ensuring the stability of engine fuel metering. Attached Figure Description

[0019] Figure 1This is a schematic diagram of a multi-oil-path switching and synchronization device provided in an embodiment of the present invention;

[0020] Wherein: 1-Metering upper cavity conversion bushing, 2-Metering upper cavity conversion valve, 3-Metering upper cavity spring, 4-Metering upper cavity spring seat, 5-Metering upper cavity end cap, 6-Metering lower cavity bushing, 7-Metering lower cavity valve, 8-Metering lower cavity gasket, 9-Metering lower cavity end cap. Detailed Implementation

[0021] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] The invention addresses the synchronization requirements of the upper and lower chamber switching valves in the main fuel metering conversion of a certain type of engine. It proposes a linear arrangement of the upper and lower chamber switching valves with mechanical locking. When the control oil pushes the lower chamber valve to move, the upper chamber valve, which is mechanically locked to it, also moves accordingly, ensuring complete synchronization of the two valves, avoiding multiple malfunctions and ensuring the stability of engine fuel metering.

[0023] This invention provides a multi-oil-path switching device for switching synchronization, such as... Figure 1 As shown, the system includes an upper metering chamber conversion bushing 1, an upper metering chamber conversion valve 2, an upper metering chamber spring 3, an upper metering chamber spring seat 4, an upper metering chamber end cap 5, a lower metering chamber bushing 6, a lower metering chamber valve 7, a lower metering chamber gasket 8, and a lower metering chamber end cap 9. The upper metering chamber conversion bushing 1, the upper metering chamber conversion valve 2, the lower metering chamber bushing 6, and the lower metering chamber valve 7 are all cylindrical structures. The upper metering chamber conversion valve 2 and the lower metering chamber valve 7 have linear stop mechanisms, and the stop points communicate with the return oil. The upper metering chamber conversion bushing 1 houses the upper metering chamber conversion valve 2. The left end of the upper metering chamber conversion valve 2 is connected to the upper metering chamber end cap 5 via the upper metering chamber spring 3 and the upper metering chamber spring seat 4. The lower metering chamber bushing 6 houses the lower metering chamber valve 7. The right end of the lower metering chamber conversion valve 7 is connected to the lower metering chamber end cap 9 via the lower metering chamber gasket 8.

[0024] The upper metering chamber conversion bushing 1 has a control oil circuit with two inlets and two outlets, namely, main valve oil inlet 1, backup valve oil inlet 1, main valve fuel outlet 1, backup valve fuel outlet 1, and return oil 1. The lower metering chamber bushing 6 has a control oil circuit with four inlets and two outlets, namely, main valve oil inlet 2, backup valve oil inlet 2, constant pressure oil, control oil, main valve outlet 2, and backup valve outlet 2, for a total of 11 oil circuits.

[0025] During normal operation, the control oil is low-pressure oil. Neither the upper metering chamber switching valve 2 nor the lower metering chamber valve 7 operates. The main valve inlet 1 communicates with the main valve fuel outlet 1, the backup valve inlet 1 communicates with the backup valve fuel outlet 1, the main valve inlet 2 communicates with the main valve outlet 2, and the backup valve inlet 2 communicates with the backup valve outlet 2. When a main valve malfunctions and switching is required, the control oil pressure increases, pushing the lower metering chamber valve 7 to move. The upper metering chamber switching valve 2, which is attached to it, also moves, connecting the backup valve inlet 1 with the main valve fuel outlet 1, and the backup valve inlet 2 with the main valve outlet 2, ensuring the stability of the oil supply to the main valve outlets 1 and 2.

[0026] When the main valve and the backup valve are working properly, the oil supplied from the main valve is supplied to the main metering valve, and the oil supplied from the backup valve is supplied to the hot return oil metering valve. When the main valve fails, the control oil pressure increases, and both valves move simultaneously, with the oil supplied from the backup valve being supplied to the main metering valve, thus ensuring the stability of the fuel supply to the main metering valve.

[0027] To meet thermal management requirements, a certain engine fuel system incorporates a hot return fuel metering system. The hot return fuel electro-hydraulic servo valve serves as a backup to the main fuel metering electro-hydraulic servo valve. Under normal operation, fuel from the main electro-hydraulic servo valve supplies fuel to the main fuel metering valve, while fuel from the hot return fuel electro-hydraulic servo valve supplies fuel to the hot return fuel metering valve. When the main fuel electro-hydraulic servo valve malfunctions, the hot return fuel electro-hydraulic servo valve supplies fuel to the main fuel metering valve. To avoid dead zones in fuel metering and ensure the stability of main fuel metering, the two metering switching valves must be fully synchronized. Engine testing has demonstrated that the two metering switching valves switch synchronously, and the main fuel metering flow is stable with no dead zones.

[0028] To avoid processing and assembly difficulties, two switching valves are used instead when there are multiple switching valve oil circuits. To ensure the synchronization of the two switching valves, the two oil circuits passing through the control chambers of the two switching valves are distributed as symmetrically as possible. The technical solution of this invention breaks the traditional symmetrical oil circuit layout. The two switching valves adopt a linear layout with rigid support and use the same control oil circuit, ensuring that the two switching valves switch simultaneously and completely synchronously, avoiding the occurrence of multiple failures and ensuring the stability of engine fuel metering.

Claims

1. A multi-oil circuit switching device for switching synchronization, characterized in that, The device includes: a metering upper chamber conversion bushing (1), a metering upper chamber conversion valve (2), a metering upper chamber spring (3), a metering upper chamber spring seat (4), a metering upper chamber end cap (5), a metering lower chamber bushing (6), a metering lower chamber valve (7), a metering lower chamber gasket (8), and a metering lower chamber end cap (9). The metering upper cavity conversion bushing (1), metering upper cavity conversion valve (2), metering lower cavity bushing (6), and metering lower cavity valve (7) are all cylindrical structures; The metering upper cavity conversion bushing (1) contains a metering upper cavity conversion valve (2). The left end of the metering upper cavity conversion valve (2) is connected to the metering upper cavity end cover (5) through the metering upper cavity spring (3) and the metering upper cavity spring seat (4). The lower metering chamber bushing (6) contains a lower metering chamber valve (7), and the right end of the lower metering chamber switching valve (7) is connected to the lower metering chamber end cap (9) through the lower metering chamber gasket (8); The metering upper chamber conversion valve (2) and the metering lower chamber valve (7) are straight stop valves, and the stop valves are connected to the return oil port. The metering upper cavity conversion bushing (1) has a control oil circuit with two inlets and two outlets, including: main valve oil inlet 1, backup valve oil inlet 1, main valve outlet 1, backup valve outlet 1; The metering lower chamber bushing (6) has a four-inlet and two-outlet control oil circuit, including: main valve oil inlet 2, backup valve oil inlet 2, constant pressure oil inlet, control oil inlet, main valve outlet 2, backup valve outlet 2; When the main valve is working normally, the control oil inlet is low pressure oil, the metering upper chamber switching valve (2) and the metering lower chamber valve (7) do not move, the main valve oil inlet 1 and the main valve outlet 1 communicate, the backup valve oil inlet 1 and the backup valve outlet 1 communicate, the main valve oil inlet 2 and the main valve outlet 2 communicate, and the backup valve oil inlet 2 and the backup valve outlet 2 communicate. When the main valve fails and needs to be switched, the control oil inlet pressure increases, pushing the metering lower chamber valve (7) to move. The metering upper chamber switching valve (2) that is attached to it also moves, connecting the backup valve oil inlet 1 with the main valve outlet 1, and the backup valve oil inlet 2 with the main valve outlet 2, thus ensuring the stability of the oil supply to the main valve outlet 1 and the main valve outlet 2.

2. The multi-oil-path switching device for switching synchronization according to claim 1, characterized in that, The main valve outlet 1 supplies fuel to the main fuel metering valve, and the backup valve outlet 1 supplies fuel to the hot return oil metering valve.

3. The multi-oil-path switching device for switching synchronization according to claim 1, characterized in that, The main valve outlet 2 supplies fuel to the main fuel metering valve, and the backup valve outlet 2 supplies fuel to the hot return oil metering valve.

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