Compact Aircraft Fuel Dosing Device with Single Sealing Member
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Solution Overview
Problem
Conventional dual circuit fuel injectors for aircraft turbomachines are cumbersome, heavy, and prone to detrimental interactions between valves, which can be improved in terms of total mass, encumbrance, and operational efficiency.
Innovation Solution
A fuel dosing device with a single movable sealing member and elastic return means, comprising a hollow outer body and intermediate body, where the sealing member controls both primary and secondary circuits, reducing interactions and mass by using a single spring configuration to adjust fuel flow based on pressure differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dual circuit fuel injector with two valves (shut-off valve and metering valve) is used, then the fuel supply control function is achieved, but the total mass and encumbrance increase
Solution Approach 1:
The patent combines the shut-off valve and metering valve functions into a single movable member that performs both sealing and metering operations. This merging of functions eliminates the need for two separate valves, thereby reducing total mass and encumbrance while maintaining the dual circuit fuel supply control function.
Solution Approach 2:
The movable member is designed to serve multiple functions: it acts as a seal against the seat to close off fuel flow, and simultaneously functions as a metering element that controls fuel distribution to primary and secondary circuits based on its position. This multi-functionality reduces the number of components needed.
2Reliability
If a conventional dual circuit fuel injector with two valves is used, then the fuel supply control function is achieved, but the encumbrance increases
Solution Approach 1:
The patent combines the shut-off valve and metering valve functions into a single movable member that performs both sealing and metering operations. This merging of functions eliminates the need for two separate valves, thereby reducing total mass and encumbrance while maintaining the dual circuit fuel supply control function.
Solution Approach 2:
The movable member is housed within the intermediate body, and the fuel flow paths are nested within the compact structure of the outer body and intermediate body. This nested arrangement allows the dual circuit control functionality to be achieved within a compact volume.
3Reliability
If a conventional dual circuit fuel injector with two valves in series is used, then the fuel supply control is achieved, but detrimental interactions between the two valves occur
Solution Approach 1:
The patent combines the shut-off valve and metering valve functions into a single movable member that performs both sealing and metering operations. This merging of functions eliminates the need for two separate valves, thereby reducing total mass and encumbrance while maintaining the dual circuit fuel supply control function.
Solution Approach 2:
The patent extracts the detrimental interaction element by eliminating one of the two valves from the system. By removing the shut-off valve as a separate component and integrating its function into the movable member, the source of harmful interactions between two separate valves is eliminated.
4Reliability
If a conventional dual circuit fuel injector with two valves is used, then the fuel supply control function is achieved, but the number of parts increases
Solution Approach 1:
The patent combines the shut-off valve and metering valve functions into a single movable member that performs both sealing and metering operations. This merging of functions eliminates the need for two separate valves, thereby reducing total mass and encumbrance while maintaining the dual circuit fuel supply control function.
Solution Approach 2:
The movable member is designed to serve multiple functions: it acts as a seal against the seat to close off fuel flow, and simultaneously functions as a metering element that controls fuel distribution to primary and secondary circuits based on its position. This multi-functionality reduces the number of components needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces the number of parts, friction, and encumbrance, while maintaining efficient fuel supply to both primary and secondary circuits, enhancing operational efficiency and reducing interactions between valves.
Implementation Method 1
elastic return means designed to return the sealing member in the direction of a closed position
Implementation Method 2
said elastic return means comprise at least one first spring and a second spring
Implementation Method 3
the member being designed to be displaced from its closed position under the effect of the fuel pressure that is applied to this member
Data Source
AI summary
A fuel dosing device for a fuel injector of an aircraft turbomachine, including an opening, a movable member for sealing the opening, and elastic return, with the member able to be displaced under the effect of the fuel pressure. The device includes a first outlet communicating with a primary circuit of the injector as well as a second outlet communicating with a secondary circuit. In addition, it is designed such that up to a defined level of displacement of the sealing member, the latter allows the fuel coming from the opening to reach the first outlet and, only beyond the defined level of displacement, the member allows the fuel coming from the opening to reach the second outlet.