Fuel Connector Valve With Orifice Reverse Flow for Pulsation Reduction
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Solution Overview
Problem
The existing fuel supply systems with damper mechanisms and return passages for reducing pulsation in low-pressure pipes are complex and costly, and their manufacturing processes face challenges such as mold durability issues during valve production.
Innovation Solution
A cylindrical connector with a reciprocally movable valve and a tapering through hole forms an orifice flow path, allowing high-pressure fuel to flow reversely while minimizing pulsation in the low-pressure pipe, and is designed to extend mold life by using a tapering protrusion for mold durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a damper mechanism or return passage is arranged to reduce pulsation in the low-pressure pipe, then pulsation reduction is achieved, but the structure becomes complex and manufacturing cost increases
Solution Approach 1:
The connector integrates a valve mechanism directly into its body, combining the connector function with the pulsation reduction function. The valve is housed inside the connector body and disposed reciprocally movable in the flow path direction, eliminating the need for separate damper mechanisms or return passages while achieving pulsation reduction
Solution Approach 2:
The connector serves multiple functions: it connects pipes, allows forward flow of low-pressure fuel, and reduces pulsation when high-pressure fuel flows in reverse. The single component performs both connection and pulsation control functions, reducing overall system complexity
2Object-affected harmful factors
If a damper mechanism or return passage is arranged to reduce pulsation in the low-pressure pipe, then pulsation reduction is achieved, but manufacturing cost increases
Solution Approach 1:
The valve mechanism is integrated into the connector body as a single molded component, reducing the number of parts that need to be manufactured separately. This integration lowers manufacturing costs by eliminating additional components while achieving pulsation reduction
3Ease of manufacture
If a valve is molded using die casting or injection molding to reduce manufacturing cost, then manufacturing cost decreases, but mold life is reduced due to complex valve shapes
Solution Approach 1:
The valve is designed with a spherical shape, which is optimal for injection molding as it allows molten material to flow evenly and eliminates sharp corners that would concentrate stress on the mold. This spherical geometry extends mold life while maintaining manufacturing efficiency
Solution Approach 2:
The valve geometry is optimized for molding by using curved surfaces and avoiding sharp edges. The spherical shape and smooth transitions change the geometric parameters to be more mold-friendly, extending mold life while keeping manufacturing costs low
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 connector effectively reduces pulsation in low-pressure pipes with a simple structure, lowers manufacturing costs, and extends mold life by using a tapering through hole design, ensuring efficient fuel supply and noise reduction.
Implementation Method 1
The tapering through hole is formed farther radially inward than the valve seat contact surface, and forms an orifice flow path having a smaller flow path cross-sectional area than the forward-direction flow path, and allows a reverse flow of the high-pressure fuel when the high-pressure fuel flows in reverse
Implementation Method 2
the valve moves to the high-pressure pump side due to the pressure of the low-pressure fuel. As a result, the valve seat contact surface of the valve is separated from the annular valve seat of the connector body
Data Source
AI summary
A connector that is in a fuel supply system capable of supplying a high-pressure fuel, and may reduce pulsation in a low-pressure pipe with a simple structure and extend the life of a mold is provided. A valve of the connector includes a valve seat contact surface and a tapering through hole. The valve seat contact surface axially separates from an annular valve seat and forms a forward-direction flow path due to pressure of the low-pressure fuel when the high-pressure fuel does not flow in reverse, and may come into contact with the annular valve seat when the high-pressure fuel flows in reverse. The tapering through hole is formed farther radially inward than the valve seat contact surface, forms an orifice flow path having a smaller cross-sectional area than the forward-direction flow path, and allows a reverse flow of the high-pressure fuel when the high-pressure fuel flows in reverse.