Fuel Pump Venturi Choke Degasification
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Solution Overview
Problem
Existing fuel pump systems for small internal combustion engines are complex and costly to manufacture, particularly due to the need for roll-over shut-off and overflow valves to prevent fuel leakage and overfilling, which increases production expenses.
Innovation Solution
The design incorporates a Venturi choke and degasification duct within the high-pressure fuel pump, eliminating the need for these valves by using the Venturi effect to manage fuel vapors and prevent vapor lock, while a filter and one-way valve provide additional protection against impurities and backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If roll-over shut-off valve and overflow valve are installed to prevent fuel leakage and overfilling, then safety and reliability are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the roll-over shut-off valve and overflow valve from the fuel pump system. Instead, it uses the engine's existing suction duct depression to draw fuel vapors through a simplified degasification duct, and relies on the fuel level in the auxiliary tank itself to prevent overfilling, thereby eliminating complex valves while maintaining safety
Solution Approach 2:
The patent makes the auxiliary tank serve multiple functions: it stores fuel for the high-pressure pump, acts as a vapor collection chamber through the degasification duct, and functions as an overflow prevention mechanism through its fixed capacity. This multi-functionality eliminates the need for separate safety valves
2Reliability
If roll-over shut-off valve and overflow valve are installed to prevent fuel leakage and overfilling, then safety and reliability are improved, but manufacturing cost increases
Solution Approach 1:
The patent eliminates expensive roll-over shut-off valves and overflow valves from the bill of materials. The simplified design uses only a degasification duct and relies on the auxiliary tank's inherent properties, significantly reducing manufacturing cost while maintaining safety through alternative mechanisms
Solution Approach 2:
The system uses the engine's own operating conditions (suction duct depression during operation) to automatically manage fuel vapors and prevent overfilling, eliminating the need for externally controlled safety valves and reducing manufacturing complexity
3Reliability
If conventional fuel pump design with multiple valves is used, then safety is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent removes multiple safety valves (roll-over shut-off valve, overflow valve) from the fuel pump assembly, leaving only the essential degasification duct. This extraction of non-essential components dramatically simplifies the manufacturing process while safety is maintained through the tank's inherent design
Solution Approach 2:
The patent combines the vapor management function and overflow prevention function into the auxiliary tank's basic structure and operation. The tank's fixed capacity inherently prevents overfilling, and the degasification duct handles vapor management, merging multiple safety functions into a single integrated solution that is easier to manufacture
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 simplifies and cost-reduces the manufacturing process by eliminating the need for roll-over shut-off and overflow valves, effectively managing fuel vapors and preventing blockages, while ensuring efficient fuel delivery and safety.
Implementation Method 1
The present invention therefore provides a fuel pump for an internal combustion engine as claimed by the appended claims. The design incorporates a Venturi choke and degasification duct within the high-pressure fuel pump, eliminating the need for these valves by using the Venturi effect to manage fuel vapors and prevent vapor lock
Implementation Method 2
In use, the depression generated in the suction duct draws the fuel vapours into the auxiliary tank through the degasification duct, thus avoiding an excessive accumulation of fuel vapours in the auxiliary tank and consequently avoiding the onset of the so-called vapour lock
Data Source
AI summary
Fuel pump for an internal combustion engine, wherein the fuel pump has: an auxiliary tank designed to receive a fuel flow from a low-pressure fuel pump; a pumping device drawing the fuel from the auxiliary tank through a suction duct; a Venturi choke arranged along the suction duct; and a degasification duct, which originates in a ceiling of the auxiliary tank and leads to the middle of the Venturi choke.