Fuel Filter Check Valve Layout for Low Pressure Loss
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Solution Overview
Problem
Conventional fuel filter devices face challenges in ensuring arrangement space for check valves without increasing the number of components, leading to difficulties in maintaining efficient fuel flow and pressure.
Innovation Solution
A fuel filter device design featuring a bag-shaped filter member, an inner frame member, and a pipe member that defines a valve chamber, incorporating a flat-plate shaped check valve with a guide member to prevent backflow while minimizing component count and reducing pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the check valve is disposed at a location in the pipe conduit where the fuel filter connects to the fuel pump, then backflow prevention is achieved, but the number of components increases and arrangement space becomes difficult to ensure
Solution Approach 1:
The check valve is integrated into the existing pipe member structure by defining the valve chamber using the inner frame member and pipe member, rather than adding a separate check valve component. This merging approach maintains backflow prevention functionality while reducing the total component count and simplifying the overall device structure
2Reliability
If a conventional ball valve is used, then backflow prevention is achieved, but the fuel passage area is limited causing pressure loss
Solution Approach 1:
The valve body shape is changed from a conventional ball valve geometry to a flat-plate shaped design. This parameter change in the valve body geometry significantly increases the fuel passage area, thereby reducing pressure loss while maintaining the backflow prevention function through the same check valve mechanism
3Ease of operation
If the valve body is allowed to deform freely, then the check valve can close, but sealing performance deteriorates
Solution Approach 1:
The guide member is designed with a guide shaft portion that provides localized guidance and constraint for the valve body during its closing motion. This local quality enhancement in the guide structure ensures the valve body maintains proper orientation and achieves reliable sealing contact, while still allowing the necessary closing movement
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
This design allows for easy arrangement of the check valve without increasing components, enhances fuel passage area, reduces pressure loss, and improves sealing performance by maintaining the valve body in a horizontal state and restricting upward deformation.
Implementation Method 1
the check valve closes due to its own weight when the operation of the fuel pump is stopped
Implementation Method 2
the check valve opens against its own weight when the fuel pump is operated
Implementation Method 3
the valve body can open and close while being maintained in a horizontal state
Implementation Method 4
the deformation restricting portion of the guide member can restrict the deformation of the valve body in the upward direction
Data Source
AI summary
A fuel filter device includes a bag-shaped filter member filtering fuel that is drawn into a fuel pump, an inner frame member retaining the filter member in an expanded state, and a mounting member connected to the inner frame member and serving to communicate an internal space of the filter member with an outside. A valve chamber is defined by the inner frame member and the mounting member, and a check valve serving to prevent backflow of fuel is disposed in the valve chamber. The check valve includes a flat-plate shaped valve body having elasticity. The check valve opens against its weight when the fuel pump is operated, and the check valve closes due to its weight when the operation of the fuel pump is stopped.