Fuel Connector Valve Structure for Low-Pressure Pulsation Damping
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Solution Overview
Problem
Existing fuel supply systems face challenges in reducing pulsation in low-pressure pipes due to the complexity and cost increase associated with damper mechanisms or return paths, which complicate the structure and increase costs.
Innovation Solution
A connector with a tubular shape, featuring a valve housing and valve body that forms a larger forward flow path under normal conditions and a smaller orifice flow path when high-pressure fuel flows back, reducing pulsation by interposing the orifice flow path between the high-pressure and low-pressure pumps, while maintaining a seal structure to prevent unwanted flow paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a damper mechanism or return path is provided to reduce pulsation in the low-pressure pipe, then pulsation reduction is achieved, but the structure becomes complicated and cost increases
Solution Approach 1:
The invention merges the pulsation reduction function with the existing connector structure by integrating a valve body and valve housing into the connector body. The valve body is positioned within the valve housing that is already part of the connector assembly, combining multiple functions (connection, sealing, and pulsation reduction) into a single integrated component rather than adding separate damper mechanisms or return paths.
Solution Approach 2:
The valve body automatically responds to pressure changes from high-pressure fuel flowback by shifting positions based on the applied pressure. When high-pressure fuel flows back, the pressure pushes the valve body to form an orifice flow path that reduces pulsation. This self-activating mechanism eliminates the need for external control systems or complex additional components.
2Object-affected harmful factors
If a damper mechanism or return path is provided to reduce pulsation in the low-pressure pipe, then pulsation reduction is achieved, but cost increases
Solution Approach 1:
The invention merges the pulsation reduction function with the existing connector structure by integrating a valve body and valve housing into the connector body. The valve body is positioned within the valve housing that is already part of the connector assembly, combining multiple functions (connection, sealing, and pulsation reduction) into a single integrated component rather than adding separate damper mechanisms or return paths.
Solution Approach 2:
The valve body automatically responds to pressure changes from high-pressure fuel flowback by shifting positions based on the applied pressure. When high-pressure fuel flows back, the pressure pushes the valve body to form an orifice flow path that reduces pulsation. This self-activating mechanism eliminates the need for external control systems or complex additional components.
3Productivity
If the valve body forms a forward flow path under normal conditions, then fuel supply efficiency is maintained, but pulsation reduction capability is limited
Solution Approach 1:
The valve body is designed to dynamically change its position and the flow path configuration based on operating conditions. Under normal conditions, the valve body forms a forward flow path for efficient fuel supply. When high-pressure fuel flows back, the pressure pushes the valve body to form an orifice flow path with smaller cross-sectional area, enabling pulsation reduction. This dynamic adaptability allows the system to optimize for different operating modes.
Solution Approach 2:
The invention changes the flow path parameters (cross-sectional area, flow resistance) based on operating conditions. The valve body position determines whether a large cross-sectional area forward flow path or a smaller cross-sectional area orifice flow path is formed. This parameter change enables the system to maintain high fuel supply efficiency during normal operation while providing pulsation reduction capability during flowback conditions.
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 without complicating the system structure, ensuring efficient fuel supply and noise reduction, while being cost-effective and easy to assemble and mount.
Implementation Method 1
a forward flow path is formed between the valve body and an inner circumferential surface of the valve housing by a pressure of the low-pressure fuel
Implementation Method 2
Owing to the action of the orifice flow path, pulsation in the low-pressure pipe on the low-pressure pump side with respect to the connector is reduced
Implementation Method 3
a seal structure interposed therebetween, the seal structure being configured to restrict flow of fuel between the valve housing and an inner circumferential surface of the connector body
Data Source
AI summary
A connector includes: a connector body formed in a tubular shape; a valve housing formed in a tubular shape and provided inside the connector body with a seal structure interposed therebetween, the seal structure restricting flow of fuel between the valve housing and an inner circumferential surface of the connector body; and a valve body stored inside the valve housing, the valve body being configured to, when high-pressure fuel does not flow back, come into a first state in which a forward flow path is formed between the valve body and an inner circumferential surface of the valve housing by a pressure of low-pressure fuel, and when the high-pressure fuel flows back, come into a second state in which an orifice flow path having a smaller flow path sectional area than the forward flow path is formed between the valve body and the inner circumferential surface of the valve housing.