Fuel Filter Assembly With Automatic Shutoff Valves
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Solution Overview
Problem
Existing fuel filters lack efficient mechanisms for servicing without fuel leakage and require detachment of fuel lines, leading to complex and costly maintenance, especially in integrated systems like gas turbine engines.
Innovation Solution
A fuel filter design featuring a manifold, connector element, filter bowl, inlet and outlet shutoff valves, and a relief valve, which allows for reversible attachment and detachment without fuel leakage, enabling simplified servicing and integration with existing systems by maintaining fuel flow through the filter element until a predetermined pressure is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the filter bowl is detached from the connector element for servicing, then the filter element can be replaced, but fuel leaks from the inlet and outlet ports
Solution Approach 1:
The shutoff valves are pre-positioned in closed positions with biasing means (springs) that automatically activate them when the filter bowl is detached. This preliminary action of closing the valves before actual disconnection prevents fuel leakage during the servicing operation.
Solution Approach 2:
The biasing means on the shutoff valves create a preliminary counteracting force that opposes fuel pressure and automatically closes the valves when the filter bowl is removed. This preliminary anti-action neutralizes the harmful effect of fuel leakage before it can occur during disconnection.
2Ease of repair
If fuel lines are detached from the manifold for filter servicing, then the filter can be serviced, but the servicing process becomes complex and time-consuming
Solution Approach 1:
The shutoff valves are designed to automatically activate themselves when the filter bowl is detached, without requiring external control or manual operation. The biasing means causes the valves to self-close, enabling the system to service itself without additional steps for the operator.
Solution Approach 2:
The shutoff valves are integrated directly into the manifold structure, combining the valve function with the existing fuel filter assembly. This eliminates the need for separate external valve mechanisms and simplifies the overall servicing procedure.
3Productivity
If the relief valve allows fuel to bypass the filter element at high pressure, then continuous fuel flow is maintained, but the filter element is bypassed
Solution Approach 1:
The relief valve responds to changes in pressure parameters by opening only when the pressure differential across the filter element exceeds a predetermined threshold. This parameter-based control allows the system to maintain filtration under normal conditions while providing bypass capability under extreme conditions.
Solution Approach 2:
The relief valve acts as an intermediary mechanism between the filtered fuel flow path and the bypass path. It mediates the decision of whether fuel should pass through the filter element or bypass it, based on pressure conditions, ensuring continuous fuel supply while protecting the system.
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 design prevents fuel leakage during servicing, reduces maintenance costs, and allows for easy integration with existing fuel filter configurations, ensuring continuous operation and high reliability.
Implementation Method 1
The inlet shutoff valve is biased by a biasing means into a closed configuration and the outlet shutoff valve is biased by a biasing means into a closed configuration
Implementation Method 2
the outlet shutoff valve is configured to move into an open configuration which allows fuel to flow along the outlet passage when fuel immediately upstream of the outlet shutoff valve reaches a predetermined pressure
Data Source
AI summary
A fuel filter is provided which includes a manifold, a connector element, a filter bowl, a filter element, an inlet shutoff valve, an outlet shutoff valve, an inlet port, an inlet passage, an outlet port, an outlet passage and a relief valve in which the connector element is fixed to the manifold, and the filter bowl is reversibly fixed to the connector element. The filter bowl is adapted to reversibly receive the filter element and is so configured that when the filter element is located within the filter bowl and the filter bowl attached to the connection element, the filter element divides the space defined by the connector element and filter bowl into an inlet filter chamber and an outlet filter chamber and the inlet port is incorporated in the manifold, and the inlet port and inlet filter chamber are in fluid communication via the inlet passage.