Fuel Pump Venting Structure to Prevent Siphonage and Overflow

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Solution Overview

Problem

Existing fuel pumps suffer from complex structures leading to fuel leakage, siphonage, and seal failure, which can damage internal components and pollute the environment, and also allow fuel to flow out due to gravity when the outlet is lower than the fuel surface.

Innovation Solution

A double-channel coupling design with an exhaust outlet leading back to the fuel can, incorporating a one-way soft rubber exhaust valve and a dynamic pressure balance cavity, ensuring leaked fuel flows back into the fuel can, preventing siphonage and overflow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a ventilation valve is arranged at the flow channel, then exhaust function is provided, but fuel leakage and siphonage occur due to complex structure and high precision requirements

Engineering Contradiction:

Improveexhaust functionVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the exhaust function from the complex ventilation valve system and implements it through a simplified exhaust channel (44) that directly connects the pump housing interior to the exterior, eliminating the need for precision ventilation valves while maintaining exhaust functionality and preventing fuel leakage

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the flow channel into distinct functional channels: a main flow channel for fuel pumping and a separate exhaust channel for venting. This segmentation allows each channel to perform its specific function independently, simplifying the overall structure while preventing fuel leakage between channels

Inventive Principle:

Principle #1Segmentation

2Reliability

If a one-way exhaust valve is equipped, then exhaust function is provided, but seal failure risks cause liquid to enter controller and pollute environment

Engineering Contradiction:

Improveexhaust functionVSAvoidfuel pollution and control component damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the potential harmful effect of exhaust valve failure into a beneficial design by creating a dedicated exhaust channel (44) that directs any leaked fuel away from the controller and toward the exterior or back to the fuel source, thus preventing pollution and component damage while maintaining exhaust functionality

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The exhaust channel assembly acts as an intermediary between the pump housing interior and the external environment, providing a controlled pathway for exhaust gases and potential fuel leaks, preventing direct contact between leaked fuel and the controller or surrounding environment

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If fuel outlet is lower than fuel surface, then fuel can flow out under gravity, but siphonage occurs causing continuous fuel loss

Engineering Contradiction:

Improvefuel dischargeVSAvoidfuel loss

Core Design Contradiction:

Ease of operationVSLoss of substance

Solution Approach 1:

The patent applies preliminary anti-action by designing the exhaust channel (44) to counteract the siphonage effect before it causes significant fuel loss. The channel provides an alternative pathway that prevents negative pressure buildup, thereby preventing continuous fuel loss through siphonage while still allowing gravity-driven fuel discharge

Inventive Principle:

Principle #9Preliminary anti-action

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

Effectively prevents fuel leakage and siphonage by allowing leaked fuel to return to the fuel can, protecting the control system and ensuring reliable operation.

Implementation Method 1

The exhaust valve is a one-way soft rubber exhaust valve

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

The exhaust valve is a one-way soft rubber exhaust valve

Methodology Applied

Scientific EffectSelective permeability: Filter (physical)

Implementation Method 3

a dynamic pressure balance cavity is formed inside a main flow channel

Methodology Applied

Scientific EffectPressure equalization: Pascal's Law

Implementation Method 4

fuel will still flow out through the fuel outlet under the action of gravity

Methodology Applied

Scientific EffectGravity: Gravitation

Data Source

PatentUS12473192B1Anti-siphonage and anti-overflow fuel pump structure

Publication Date: 2025.11.18 ZHONGSHAN YULITE TECHNOLOGY CO LTD

AI summary

Disclosed is an anti-siphonage and anti-overflow fuel pump structure. The anti-siphonage and anti-overflow fuel pump structure includes a fuel pump, a fuel inlet hose, a main flow channel assembly, a control box, an exhaust and backflow channel assembly, and a fuel outlet hose, where the control box includes a housing, a battery assembly, and a control board; the main flow channel assembly includes an input channel, an output channel, an exhaust port, and a seal port; and the exhaust and backflow channel assembly includes an exhaust valve, a pipeline joint, an exhaust pipe, and an exhaust and backflow channel, the exhaust valve is arranged inside the exhaust port, the pipeline joint is arranged above the exhaust valve, one end of the exhaust pipe is connected to the pipeline joint, and the other end of the exhaust pipe is connected to the exhaust and backflow channel.