Fuel Pressure Pulsation Damping Device with Rotatory Impeller
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Solution Overview
Problem
Conventional fuel pressure pulsation damping devices for diesel engines are expensive and fail to effectively dampen vibrations caused by fuel pressure pulsations in the fuel return line, leading to noise transmission into the vehicle body.
Innovation Solution
A fuel pressure pulsation damping device located in the fuel return line between the high pressure pump and fuel tank, featuring a housing with an inlet, outlet, and intermediate pipe, and a rotatory impeller with vanes positioned in the intermediate pipe, which converts kinetic energy from pressure pulsations into rotatory energy, reducing noise through turbulence and energy dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metallic pulsation damping box is used in the fuel line, then the fuel pressure pulsation can be dampened, but the cost increases significantly
Solution Approach 1:
The patent replaces expensive metallic pulsation damping boxes with a cost-effective plastic housing containing a disposable impeller assembly. The housing is made of inexpensive plastic material, and the impeller is designed as a simple rotatory component that can be easily manufactured and replaced if needed, significantly reducing the overall cost while maintaining pulsation damping functionality.
Solution Approach 2:
The patent substitutes the traditional metallic mechanical damping box with a hydrodynamic damping mechanism using a rotatory impeller with vanes. The impeller converts fuel pressure pulsations into rotational motion, dissipating energy through fluid dynamics rather than relying on metallic structural damping, thereby achieving cost reduction while maintaining effectiveness.
2Object-affected harmful factors
If a conventional metallic pulsation damping box is used, then damping effect is achieved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the essential damping function from complex metallic damping boxes and implements it through a simple impeller-vane mechanism within a basic housing. The core damping action is achieved by the impeller's interaction with fuel flow, eliminating the need for complex metallic structures, multiple components, and assembly procedures associated with conventional damping boxes.
Solution Approach 2:
The patent changes the fundamental operating principle from passive structural damping (metallic box) to active hydrodynamic damping (rotatory impeller). By changing the damping mechanism from structural vibration absorption to fluid-driven rotational energy dissipation, the device achieves effective vibration reduction with simpler construction and lower complexity.
3Object-affected harmful factors
If the intermediate pipe has a larger cross-sectional area, then the pulsation damping effectiveness is improved, but the housing volume increases
Solution Approach 1:
The patent resolves the volume conflict by transitioning from a linear expansion approach to a three-dimensional impeller mechanism. The intermediate pipe maintains a manageable cross-sectional area, while the impeller utilizes the third dimension (rotational motion) to achieve pulsation damping. The larger cross-sectional area mentioned in the patent refers to the impeller's effective area for intercepting pulsations, not the pipe diameter, allowing effective damping within a compact housing volume.
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 effectively reduces fuel pressure pulsations and associated noise by converting pulsation energy into rotatory energy, providing a cost-effective and efficient damping mechanism that minimizes vibration transmission to the vehicle body.
Implementation Method 1
a rotatory impeller positioned in the intermediate pipe... converts kinetic energy from pressure pulsations into rotatory energy
Implementation Method 2
reducing noise through turbulence and energy dissipation
Data Source
AI summary
The present disclosure provides a fuel pressure pulsation damping device in a fuel return line between a high pressure pump and a fuel tank in a fuel system. The fuel pressure pulsation damping device includes a housing having an inlet pipe, an outlet pipe and an intermediate pipe; and a rotatory impeller positioned in the intermediate pipe.