Fuel Supply Valve Pressure Chamber Segmentation for Flow Control
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Solution Overview
Problem
Fuel supply valves in fuel cell systems face challenges in maintaining airtightness at high pressures and preventing overshoot during valve opening, especially when the cross-sectional area of the pressure chamber is excessively wider than the valve, leading to inefficient hydrogen flow control.
Innovation Solution
A proportional control valve type fuel supply valve is designed with a plunger, core part, and block part to maintain airtightness, featuring a pressure chamber within the plunger, a spring, and a chamber guide to regulate the opening based on input current, minimizing the magnetic force required and reducing the size of the coil, thus ensuring high-pressure airtightness and minimizing overshoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cross-sectional area of the pressure chamber is excessively wider than the valve, then the hydrogen flow rate can be increased, but overshoot occurs at initial opening of the valve
Solution Approach 1:
The pressure chamber is divided into two distinct chambers: a first pressure chamber with larger cross-sectional area for high flow rate, and a second pressure chamber with smaller cross-sectional area matching the valve for stable control. This segmentation allows each chamber to fulfill different functional requirements simultaneously.
Solution Approach 2:
Different regions of the pressure chamber are given different cross-sectional areas according to their specific functional needs. The first pressure chamber has a larger area for flow capacity, while the second pressure chamber has a smaller area for control precision, creating local quality variations that resolve the contradiction.
2Device complexity
If a conventional valve structure is used, then the structure is simple, but airtightness cannot be maintained at high pressure
Solution Approach 1:
The core part is inserted into the plunger, creating a nested structure where the core part resides within the hollow interior of the plunger. This nested configuration allows the block part to effectively seal the interface between the core part and plunger, maintaining airtightness at high pressure while keeping the overall structure compact.
Solution Approach 2:
The block part acts as an intermediary element disposed between the core part and the plunger to maintain airtightness. This intermediary component specifically addresses the sealing requirement at the interface, enabling high-pressure airtightness without significantly increasing structural complexity.
3Productivity
If the pressure chamber cross-sectional area is large, then hydrogen flow rate is high, but the magnetic force required to open the valve increases
Solution Approach 1:
The pressure chamber is segmented into two chambers with different cross-sectional areas. The second pressure chamber has a smaller area that corresponds to the valve opening area, which reduces the total force required to open the valve while the first pressure chamber maintains high flow rate capability.
Solution Approach 2:
The cross-sectional area parameter of the pressure chamber is changed by dividing it into two chambers with different areas. This parameter modification allows the valve to operate with reduced magnetic force requirement while maintaining high hydrogen flow rate capability.
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 maintains airtightness and precise control of hydrogen flow, reducing the size of the fuel supply valve while minimizing overshoot by balancing the forces acting on the plunger, ensuring consistent force relationships before and after valve opening.
Implementation Method 1
the extension part transfers a magnetic force to the plunger
Implementation Method 2
a spring disposed within the pressure chamber to connect the plunger with the chamber guide
Data Source
AI summary
A fuel supply valve for supplying fuel from a fuel tank to a fuel cell stack includes: a plunger having a hollow therein, a core part disposed on the plunger, and a block part disposed within the hollow to maintain airtightness between the core part and the plunger, and a space in which the airtightness of the hollow has been maintained by the plunger, the core part, and the block part is defined as a pressure chamber.