Fuel Cell Pump Assembly Segmentation for Cost Reduction
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Solution Overview
Problem
Current fuel cell systems face challenges in efficiently and cost-effectively storing and delivering hydrogen gas due to the limitations of metal hydride canisters and compressed hydrogen tanks, as well as the complexity of managing multiple fluid ports when generating hydrogen from hydrogen-containing fuel precursors.
Innovation Solution
A pump assembly that isolates fluid-contacting components from actuating components, allowing for a cost-effective fuel generator design by separating the pump actuator from the fluid-contacting components and minimizing technical complexities related to multiple fluid ports, using a first subassembly within the fuel generator and a second subassembly within the fuel cell system to manage the liquid reactant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pump is placed within the fuel generator, then the fluid interface is simple, but the cost of the fuel generator increases
Solution Approach 1:
The pump is divided into two separate subassemblies: a first subassembly containing fluid-contacting components (pump chamber, diaphragm, valves) that interfaces with the fuel generator, and a second subassembly containing the actuator that interfaces with the fuel cell system. This segmentation allows the fuel generator to remain simple and low-cost while the actuator can be positioned elsewhere.
Solution Approach 2:
A fluid conduit acts as an intermediary, carrying the liquid reactant from the fuel generator to the reaction site. This allows the pump's fluid-contacting components to remain in the fuel generator while the actuator can be positioned in the fuel cell system, resolving the cost-complexity tradeoff.
2Ease of manufacture
If the pump is placed within the fuel cell system, then the fuel generator cost decreases, but the system complexity increases due to multiple fluid ports
Solution Approach 1:
The pump assembly is segmented into a first subassembly that remains integrated with the fuel generator (simplifying its design) and a second subassembly with the actuator that connects to the fuel cell system. This segmentation reduces the fuel generator's complexity while allowing the actuator to be positioned where it can manage fluid ports efficiently.
Solution Approach 2:
The actuator is extracted from the fuel generator and positioned in the fuel cell system, leaving only the essential fluid-contacting components in the fuel generator. This extraction reduces the fuel generator's complexity while maintaining its low-cost advantage.
3Weight of moving object
If hydrogen is stored in compressed tanks, then energy density to weight ratio is high, but containment cost and complexity increase
Solution Approach 1:
The system changes the state of hydrogen from compressed gas storage to in-situ generation from liquid reactants. This parameter change eliminates the need for high-pressure containment systems, reducing cost and complexity while maintaining efficient hydrogen delivery to the fuel cell.
4Reliability
If hydrogen is stored in metal hydride canisters, then safety is improved, but energy density to weight ratio decreases
Solution Approach 1:
The system transitions from physical hydrogen storage (metal hydrides or compressed gas) to chemical hydrogen generation from liquid reactants. This parameter change enables safe hydrogen production on-demand without the weight penalties of metal hydride canisters, improving energy density while maintaining safety through controlled reaction 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
This design reduces the cost of the fuel generator, minimizes leakage risks, and maintains fluid containment within the fuel generator, ensuring efficient and safe hydrogen production for fuel cells.
Implementation Method 1
flexing of the diaphragm increases a pressure within the pump chamber to force the liquid reactant through the outlet
Implementation Method 2
a pump assembly that isolates fluid-contacting components from actuating components... maintains fluid containment within the fuel generator
Data Source
AI summary
A pump assembly including a first subassembly and a second subassembly. The first subassembly includes a fluid conduit; an inlet fluidly coupled to the liquid reactant dispenser and the fluid conduit; an outlet fluidly coupled to a reaction chamber and the fluid conduit; and a diaphragm, defining a portion of the fluid conduit, that flexes to pump the liquid reactant from the inlet to the outlet. The diaphragm preferably includes an actuation point coupled to the diaphragm, wherein the liquid reactant is substantially contained within the first subassembly during pumping. The second subassembly is couplable to the first subassembly, and is fluidly isolated from the liquid reactant. The second subassembly includes an actuator that couples to the actuation point, wherein operation of the actuator causes pumping action.