Suction Filter Fuel Stoppers Prevent Air Entrainment
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Solution Overview
Problem
In fuel supply devices, the suction efficiency of fuel into the suction port is compromised due to inertial forces causing air to be preferentially suctioned over fuel, leading to drivability deterioration and engine stall.
Innovation Solution
A suction filter with a permeable bottom wall and fuel stoppers arranged along the bottom wall, which filters and directs fuel flow to prevent air from being suctioned preferentially, ensuring fuel is moved towards the suction port despite inertial forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter material is placed to cover the inside space for filtering fuel, then fuel filtration is improved, but air is preferentially suctioned into the suction port when fuel level drops due to inertial forces, deteriorating suction efficiency
Solution Approach 1:
The filter screen is designed as a porous permeable wall that allows both fuel and air to pass through while filtering the fuel. This porous structure enables the selective passage of fluids based on their properties, allowing air to pass through during inertial forces while maintaining fuel filtration capability.
Solution Approach 2:
Air bubbles act as an intermediary substance that mixes with fuel in the inside space. The air bubbles, introduced through the permeable bottom wall, interact with the fuel to prevent preferential suction of air and improve overall suction efficiency by creating a mixed fluid that behaves more favorably under inertial forces.
2Stability of the object's composition
If the filter screen is exposed from the fuel surface due to inertial forces during vehicle acceleration or turning, then fuel displacement is prevented, but air enters the inside space and is suctioned preferentially, reducing fuel suction efficiency
Solution Approach 1:
The permeable bottom wall is designed to allow air to enter the inside space in advance when fuel level drops due to inertial forces. This preliminary air entry prevents the formation of a vacuum or excessive negative pressure that would otherwise cause preferential air suction, thereby maintaining fuel suction efficiency.
Solution Approach 2:
The introduction of air bubbles changes the physical parameters of the fluid mixture in the inside space. The air-fuel mixture has different density and compressibility characteristics compared to pure fuel, which alters how the fluid responds to inertial forces and suction pressure, preventing preferential air suction.
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 solution enhances fuel suction efficiency by mixing air bubbles with fuel, allowing fuel to be effectively suctioned against inertial forces, thereby preventing drivability issues and engine stalls.
Implementation Method 1
the bottom wall, which forms the inside space, filters the fuel that permeates through the bottom wall
Implementation Method 2
when the fuel is forced and is displaced to one side in the fuel tank by an inertial force
Implementation Method 3
the air, which permeates from the outside of the surface of the fuel into the inside space through the bottom wall, is mixed as air bubbles in the fuel that is stopped by the fuel stoppers
Implementation Method 4
the fuel, which is in the air mixed state, receives the negative suction pressure exerted from the suction port and may be thus moved toward the suction port against the inertial force
Data Source
AI summary
A suction filter, through which fuel is suctioned into a suction port of a fuel pump after filtering the fuel in an inside of a fuel tank of a vehicle, includes a filter screen and a plurality of fuel stoppers. The filter screen is placed to cover an inside space, in which a negative suction pressure is exerted from the suction port. The filter screen includes a bottom wall that forms the inside space and is formed as a permeable wall, through which the fuel and air are permeable, and the filter screen filters the fuel permeated through the permeable wall. The fuel stoppers are arranged along the bottom wall from a side, at which the suction port is located, toward an away side, which is away from the suction port. The fuel stoppers extend toward the bottom wall in the inside space.