Fuel Filter Assembly With Self-Actuating Shutoff Valves
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Solution Overview
Problem
Existing fuel filters lack efficient mechanisms for preventing fuel leakage during servicing and do not allow for seamless integration with existing fuel filter manifolds, leading to increased maintenance costs and complexity.
Innovation Solution
A fuel filter design featuring a manifold, connector element, filter bowl, shutoff valves, and a relief valve, where the shutoff valves are biased to closed configurations when not connected, and the relief valve opens at a predetermined pressure to ensure continuous fuel flow, allowing for safe servicing and compatibility with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shutoff valves are added to prevent fuel leakage during servicing, then fuel safety during maintenance is improved, but device complexity increases
Solution Approach 1:
The inlet shutoff valve and outlet shutoff valve are integrated into the filter assembly structure, with both valves controlled by a single biasing mechanism (spring) that automatically actuates them during filter bowl removal. This merging of functions reduces overall system complexity while maintaining fuel safety during servicing operations.
Solution Approach 2:
The biasing means (spring) is pre-loaded to automatically close the shutoff valves before fuel can leak during the servicing process. When the filter bowl begins to disconnect from the connector element, the spring force immediately actuates the valves to closed positions, preventing fuel leakage before it can occur.
2Ease of repair
If automatic shutoff valves are implemented, then maintenance cost is reduced, but device complexity increases
Solution Approach 1:
The shutoff valves are designed to be self-actuating through the biasing spring mechanism. During normal servicing when the filter bowl is removed, the spring automatically closes both inlet and outlet valves without requiring external control or additional components. This self-service capability simplifies the overall system while reducing maintenance costs by eliminating the need for complex control systems.
3Productivity
If relief valve opens at predetermined pressure, then continuous fuel flow is ensured, but fuel pressure control becomes less precise
Solution Approach 1:
The relief valve is designed to open at a predetermined pressure threshold, changing the flow path parameter from filtered to unfiltered bypass. This parameter change ensures continuous fuel flow when the filter element becomes blocked, maintaining productivity while accepting a simplified pressure regulation approach that trades precision for reliability.
4Ease of operation
If filter bowl is designed for reversible connection, then ease of servicing is improved, but risk of fuel leakage during connection increases
Solution Approach 1:
The biasing spring is pre-loaded to automatically close the shutoff valves at the moment the filter bowl begins to disconnect from the connector element. This preliminary action occurs before any fuel leakage can happen, allowing the filter bowl to be easily removed for servicing while preventing fuel spillage throughout the entire disconnection process.
Solution Approach 2:
The shutoff valves are positioned and biased to close before fuel pressure can cause leakage during the disconnection process. This preliminary anti-action counteracts the potential harmful effect of fuel spillage by closing the valves in advance, enabling easy reversible connection while eliminating the fuel leakage risk.
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 manifolds, ensuring reliable and efficient operation by maintaining fuel flow even when the filter element becomes blocked.
Implementation Method 1
The inlet shutoff valve is biased by a biasing means into a closed configuration which prevents fuel flowing along the inlet passage when the filter bowl is not connected to the connector element
Implementation Method 2
the relief valve is caused to move into its open configuration when a predetermined fuel pressure is reached within the inlet passage and inlet chamber
Data Source
AI summary
A fuel filter is provided which comprises 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. The inlet port mouths through a surface of the manifold, and the inlet port and inlet filter chamber are in fluid communication via the inlet passage.