Fuel Filter Assembly With Auto Shutoff for Leak-Free Servicing
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Solution Overview
Problem
Existing fuel filters require complex and time-consuming servicing processes, involving detachment of fuel lines and drainage, which increases maintenance costs and downtime, especially when replacing the filter element.
Innovation Solution
A fuel filter design featuring a manifold, connector element, filter bowl, inlet and outlet shutoff valves, and a relief valve, where the inlet and outlet shutoff valves are biased to close at low pressure, preventing fuel leakage and allowing seamless servicing without line detachment, and the relief valve ensures fuel flow without passing through the filter element when pressure differences exceed a predetermined value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If traditional fuel filter design is used, then fuel filtering function is provided, but servicing requires detachment of fuel lines and drainage which increases maintenance time and complexity
Solution Approach 1:
The shutoff valves are pre-positioned in the fuel lines and automatically close when pressure drops during servicing, preventing fuel leakage before the actual filter element replacement begins. This preliminary protective action eliminates the need for manual line detachment and drainage procedures
Solution Approach 2:
The system uses its own fuel pressure to automatically control the shutoff valves through pressure-sensitive mechanisms. When pressure drops during servicing, the valves self-close without external intervention, and automatically reopen when pressure is restored, making the system self-regulating during maintenance operations
2Ease of repair
If shutoff valves are added to prevent fuel leakage during servicing, then servicing ease is improved, but device complexity increases
Solution Approach 1:
The shutoff valves are actuated automatically by the fuel pressure itself through pressure-sensitive diaphragms or springs. The system uses its own operating pressure to open the valves during normal operation and automatically closes them when pressure drops during servicing, eliminating the need for external actuators, solenoids, or complex control mechanisms
Solution Approach 2:
The shutoff valves utilize hydraulic pressure from the fuel line to control their operation. The fuel pressure acts on a diaphragm or piston mechanism that mechanically opens or closes the valve seats, converting fluid pressure directly into valve actuation without requiring additional pneumatic or hydraulic control systems
3Reliability
If relief valve is added to bypass filter element at high pressure differential, then fuel flow continuity is maintained, but device complexity increases
Solution Approach 1:
The relief valve is automatically actuated by the pressure differential across the filter element itself. When the differential exceeds a predetermined threshold, the higher pressure on the inlet side directly lifts the relief valve to open the bypass passage, and automatically closes when the differential decreases, requiring no external sensors or control systems
Solution Approach 2:
The relief valve bypass mechanism is integrated into the existing valve assembly structure, combining the shutoff valve and relief valve functions in a single compact unit. The bypass passage is formed within the same housing that contains the shutoff valves, merging multiple functions into one integrated component rather than adding separate assemblies
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
Facilitates swift and cost-effective servicing of fuel filters by preventing fuel leakage during element replacement, minimizing maintenance time and costs, and allowing adaptation to existing fuel filter configurations, while maintaining reliability and compactness.
Implementation Method 1
The inlet shutoff valve is biased by a biasing means into a closed configuration which prevents fuel flowing along the inlet conduit when fuel in the inlet conduit has a fuel pressure below a predetermined value
Implementation Method 2
the relief valve is caused to move into its open configuration from its closed configuration when the difference between the fuel pressure in the filter inlet chamber and the filter outlet chamber is equal to or greater than a predetermined value
Data Source
Figure 1~2
Figure 3~5
Figure 4~6
AI summary
A fuel filter (2) comprising a manifold (4), a connector element (6), a filter bowl (8), a filter element (22), an inlet shutoff valve (74), an outlet shutoff valve (92), an inlet port (10), an inlet conduit (72), an outlet port (12), an outlet conduit (90) and a relief valve (45) is disclosed. The connector element (6) is fixed to the manifold (4), and the filter bowl (8) is reversibly fixed to the connector element (6). The connector element (6) is adapted to engage with the filter element (22). The filter bowl (8) is adapted to reversibly receive the filter element (22) and is so configured that when the filter element (22) is located within the filter bowl (8) and the filter bowl (8) is attached to the connection element (6) the filter element (22) divides the space defined by the connector element (6) and filter bowl (8) into an inlet filter chamber (24) and an outlet filter chamber (26). The inlet port (10) is incorporated in the manifold (4), and the inlet port (10) and inlet filter chamber (24) are in fluid communication via the inlet conduit (72). The outlet port (12) is incorporated in the manifold (4) and the outlet port (12) and outlet filter chamber (26) are in fluid communication via the outlet conduit (90). The inlet shutoff valve (74) is biased by a biasing means (86) into a closed configuration which prevents fuel flowing along the inlet conduit (72) when fuel in the inlet conduit (72) has a fuel pressure below a predetermined value, and the outlet shutoff valve (92) is biased by a biasing means (66) into a closed configuration which prevents fuel flowing along the outlet conduit (90) when fuel in the outlet filter chamber (26) has a fuel pressure below a predetermined value. The relief valve (45) is biased by a biasing means (66) into a closed configuration in which fuel flowing between the inlet filter chamber (24) and outlet filter chamber (26) passes through the filter element (22), and movement of the relief valve (45) into an open configuration allows fuel to flow between the inlet filter chamber (24) and the outlet filter chamber (26) via the relief valve (45) without the fuel passing through the filter element (22). The relief valve (45) is caused to move into its open configuration from its closed configuration when the difference between the fuel pressure in the filter inlet chamber (24) and the filter outlet chamber (26) is equal to or greater than a predetermined value.