Compact Valve Assembly for Fuel Cell Power Generator
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Solution Overview
Problem
In PEM fuel cell based power generators, the pneumatic valve occupies a substantial portion of the volume and weight, reducing energy density and specific energy.
Innovation Solution
A compact valve assembly with a valve plate and diaphragm assembly is designed to fit within a low height cylindrical container, allowing for a ring-shaped fuel cell with multiple segments and a self-regulating valve mechanism, enabling efficient hydrogen flow control while maintaining a small form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pneumatic valve is used to control hydrogen generating chemical reaction, then the valve can effectively control the reaction, but the valve occupies substantial portion of the power generator volume and weight, reducing energy density and specific energy
Solution Approach 1:
The fuel cell is divided into multiple segments arranged in series, with each segment having its own simplified valve mechanism. This segmentation allows the total valve function to be distributed across multiple smaller components, reducing the volume and weight of any single valve while maintaining overall control capability.
Solution Approach 2:
The valve assembly is nested within the fuel cell structure, with the valve plate and diaphragm assembly integrated into the fuel cell housing. The valve plate is positioned within the fuel cell stack, and the diaphragm is nested within the valve assembly, creating a compact integrated structure that minimizes overall volume.
2Reliability
If a pneumatic valve is used to control hydrogen generating chemical reaction, then the valve can effectively control the reaction, but the valve occupies substantial portion of the power generator weight, reducing specific energy
Solution Approach 1:
The complex pneumatic valve mechanism is extracted and replaced with a simplified valve plate and diaphragm assembly that uses elastic deformation and pressure differential alone, eliminating heavy pneumatic actuators and complex control mechanisms while retaining essential valve control function.
Solution Approach 2:
The valve plate and diaphragm assembly is designed to automatically regulate hydrogen flow based on pressure differential and elastic deformation without external control systems. The diaphragm responds self-service to pressure changes, opening or closing the valve pathway without requiring external pneumatic control, thereby eliminating heavy control mechanisms.
3Length of moving object
If the valve assembly is reduced in height, then the form factor is minimized, but the fuel capacity must be increased to maintain energy density
Solution Approach 1:
The fuel cell is configured in a ring shape around the valve assembly, utilizing the radial dimension instead of only the vertical dimension. This dimensional change allows the fuel cell to wrap around the compact valve, effectively using the horizontal space within the low-height container to maximize fuel capacity without increasing height.
Solution Approach 2:
The valve assembly and fuel cell are merged into a single integrated structure where the valve plate is positioned within the fuel cell stack and the diaphragm is nested within the valve assembly. This merging eliminates separate housing requirements and allows the fuel cell to directly surround the valve components, maximizing space utilization.
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 achieves a reduced height profile and increased fuel capacity, enhancing energy density and specific energy by optimizing the valve assembly and fuel cell configuration.
Implementation Method 1
A valve plate and diaphragm assembly are provided within a low height cylindrical container. The diaphragm is affixed to a valve stem and extends across an opening in the fuel cell. The diaphragm's elastic deformation in response to pressure differential automatically positions the valve plate to control hydrogen flow.
Implementation Method 2
Proton exchange membrane (PEM) fuel cells use a simple chemical reaction to combine hydrogen and oxygen into water, producing electric current in the process. The PEM allows protons to flow through, but not electrons. As a result, hydrogen ions flow through the PEM to a cathode, while electrons flow through an external circuit.
Implementation Method 3
At an anode, hydrogen molecules are ionized by a platinum catalyst, and give up electrons. The platinum catalyst accelerates the ionization reaction of hydrogen molecules without being consumed in the process.
Implementation Method 4
Hydrogen may be produced by a chemical reaction between a fuel, such as lithium aluminum hydride and water vapor.
Data Source
AI summary
A power generator is formed with a container adapted to hold a hydrogen generating fuel. A valve assembly has a valve plate with a border less than a border of the container. A fuel cell is laterally disposed outside and around the valve assembly having a lateral width that fits within the border of the container. A cover is adapted to mate with the container and enclose the valve plate and fuel cell.