Multi-point Aircraft Engine Fuel Injection Device with Integrated Purge
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Solution Overview
Problem
Multi-point fuel injection systems in aircraft engines face issues with desynchronized purge and injection operations, leading to risks of fuel combustion and insufficient engine thrust due to movable element failures, and the additional purge member increases device dimensions and complexity.
Innovation Solution
A multi-point fuel injection device with a movable element having both injection and purge passages, which can move to a safety position to prevent desynchronization, ensuring fuel supply through one injection line while preventing purging and reducing device size by integrating functions into a single distributor controlled by a single actuator and sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional purge member is added to the injection device to enable purging of the second injection line, then the purging function is achieved, but the dimensions and complexity of the device increase
Solution Approach 1:
The patent combines the injection and purging functions into a single distributor component. The movable element within the distributor integrates both the injection passage and purging passage, eliminating the need for a separate purge member. This merging approach achieves the purging function while reducing device complexity and dimensions.
Solution Approach 2:
The distributor is designed as a multi-functional component that performs both fuel injection and line purging operations. The movable element can configure the passages to enable injection into one or both lines, or to purge the second line, making the single component universal for multiple functions.
2Reliability
If the purge member and distributor are controlled in perfect synchronism to prevent fuel combustion, then safety is improved, but the control complexity and number of connection ports increase
Solution Approach 1:
By combining the purging and injection functions into a single distributor with a single movable element, the patent eliminates the need for separate control systems for the purge member and distributor. The single movable element is controlled by a single actuator, reducing control complexity and the number of connection ports required.
Solution Approach 2:
The movable element serves multiple functions: it controls fuel distribution to injection lines and also enables purging of the second line. This multi-functionality reduces the overall control system complexity while maintaining safety through integrated control.
3Device complexity
If a movable element with both injection and purge passages is used to combine functions, then device dimensions are reduced, but the risk of failure blocking the movable element increases
Solution Approach 1:
The patent incorporates a safety position as a fail-safe mechanism. If the movable element becomes blocked or fails, it can be positioned in a predetermined safety configuration that prevents fuel combustion in the event of failure. This beforehand cushioning approach mitigates the reliability risks associated with the integrated movable element.
4Stability of the object's composition
If the injection passage interconnects the intake line and both injection lines for multi-point injection, then fuel distribution uniformity is improved, but the risk of desynchronized purging and injection increases
Solution Approach 1:
The patent merges the control of injection and purging operations into a single movable element within the distributor. This integration ensures that when purging is activated, the injection passage configuration automatically prevents fuel supply to the second line, eliminating desynchronization risks while maintaining fuel distribution uniformity during injection mode.
Data Source
AI summary
A multi-point fuel injection device for an aircraft engine, including an inlet line, at least two injection lines, and a purge line, a fuel distributor member connected to each line and including a moveable element which includes an injection passage, in which the moveable element additionally includes a purge passage, and is configured to adopt a first range of positions in which the injection passage interconnects the inlet line and the injection lines, and a second range of positions in which the injection passage interconnects the inlet line and at least a first injection line while the purge passage interconnects the purge line and at least a second injection line, the device additionally includes an actuator adapted to move the moveable element into a safety position when a failure of the distribution member is detected, the injection passage interconnecting, in this safety position of the moveable element, the inlet line and the first injection line while the purge passage does not interconnect the purge line to any of the injection lines.