Fuel Connection Unit Integrating Pulsation Damper and Nonreturn Valve
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Solution Overview
Problem
Existing fuel connection units for vehicle heaters lack a compact design and effective means to manage fuel flow fluctuations and pressure, leading to inefficiencies and potential waste gas emissions.
Innovation Solution
Integration of a flow conditioning unit, such as a pulsation damper, fuel valve, or fuel pump within the fuel connection unit to influence fuel flow and manage pressure fluctuations, with features like pressure equalization volumes and nonreturn valves to prevent backflow and optimize fuel delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If functional units are integrated into the fuel connection unit, then fuel flow management and pressure control are improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functional units (pulsation damper, fuel valve, fuel pump) directly into the fuel connection unit body, combining what would traditionally be separate components into a single integrated assembly. This merging approach improves fuel flow management and pressure control while maintaining a manageable device complexity through unified design.
Solution Approach 2:
The fuel connection unit is designed to perform multiple functions simultaneously: connecting fuel lines, dampening pressure pulsations, controlling fuel flow via valve, and pumping fuel if needed. This multi-functionality is achieved within a single integrated unit, improving overall system reliability without requiring multiple separate components.
2Volume of moving object
If functional units are integrated into the fuel connection unit, then installation space is reduced, but manufacturing complexity increases
Solution Approach 1:
By integrating the pulsation damper, fuel valve, and fuel pump into the connection unit body, the patent reduces the total installation space required compared to having separate components. The unified structure allows these functional units to share the same housing and mounting space.
Solution Approach 2:
The functional units are nested within the connection unit body structure. The pulsation damper is arranged in the fuel flow volume, the fuel valve is integrated into the connection unit, and the fuel pump is positioned within the same housing, creating a compact nested arrangement that minimizes installation space.
3Stability of the object's composition
If a pulsation damper is used, then pressure fluctuations are reduced, but device complexity increases
Solution Approach 1:
The pulsation damper is integrated directly into the fuel connection unit body, combining pressure stabilization functionality with the fuel line connection function. This eliminates the need for a separate pulsation damper component, reducing overall system complexity while maintaining pressure stability.
Solution Approach 2:
The pulsation damper uses a pressure equalization volume and flexible separating element to hydraulically dampen pressure fluctuations in the fuel flow. This pneumatic/hydraulic approach provides effective pressure stabilization through the compressibility of gas and elasticity of the membrane.
4Object-generated harmful factors
If a nonreturn valve is integrated, then waste gas emissions are prevented, but device complexity increases
Solution Approach 1:
The nonreturn valve is integrated into the fuel connection unit body, combining the anti-backflow function with the fuel line connection. This prevents waste gas and fuel from flowing back into the fuel reservoir while maintaining a unified, manageable device structure.
Solution Approach 2:
The nonreturn valve automatically prevents backflow of fuel and waste gas without requiring external control mechanisms. The valve element and prestressing element work together to self-regulate the flow direction, preventing harmful emissions without adding complex control systems.
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 enables a compact installation with improved fuel flow management, reducing pressure fluctuations and preventing waste gas emissions, while ensuring efficient fuel delivery to the burner area.
Implementation Method 1
a flexible separating element separating the pressure equalization volume from the fuel flow volume in the connection unit body
Implementation Method 2
the at least one functional unit comprises a pulsation damper. It is thus ensured that such a pulsation damper can smoothen or eliminate fluctuations in the fuel pressure
Implementation Method 3
the fuel valve comprise a nonreturn valve blocking the fuel connection unit against flow in the direction from the fuel release line area to the fuel feed line connection area
Data Source
AI summary
A fuel connection unit (10) for a fuel-operated vehicle heater (18) includes a connection unit body (12), which can be arranged at a heater housing (16). A fuel release line connection area (32) connects a fuel release line leading to a combustion chamber. A fuel feed line connection area (46) projects from the connection unit body (12) for connecting a fuel feed line. At least one functional unit (50), for influencing the flow of fuel in a fuel flow volume (36) formed in the connection unit body (12), is provided in the connection unit body (12).