Linked Air Valve Assembly for Fuel Cell Bypass Flow Control
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Solution Overview
Problem
The existing fuel cell systems require multiple valves and actuators to manage air supply and bypass passages, leading to increased complexity and size due to the need to control air flow rates to both the fuel cell stack and other components, which complicates the system design.
Innovation Solution
A compact air valve system that integrates a supply valve, a switching valve, and a link mechanism with a cam plate and arm portion to control air flow through both the air supply passage and bypass passage, allowing for simultaneous adjustment of air flow rates with a single actuator, reducing the number of components and system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple valves and actuators are arranged on the air supply passage and bypass passage to control air flow rates, then the flow rate control precision is improved, but the device complexity and system size increase
Solution Approach 1:
The patent combines multiple valve functions into a single integrated air valve assembly. The main valve body includes both a supply valve for the air supply passage and a bypass valve for the bypass passage, actuated by a single actuator. This merging of functions reduces the number of components while maintaining the ability to independently control air flow rates to both the fuel cell stack and other components, thereby resolving the contradiction between control precision and device complexity
Solution Approach 2:
The single air valve assembly performs multiple functions: it controls air supply to the fuel cell stack via the supply valve, controls air supply to other components via the bypass valve, and can operate in multiple modes (supply mode, bypass mode, mixed mode). This multi-functionality allows one device to replace what would traditionally require multiple separate valves and actuators, reducing system complexity while maintaining precise flow rate control
2Measurement precision
If multiple valves and actuators are arranged on the air supply passage and bypass passage to control air flow rates, then the flow rate control precision is improved, but the system size increases
Solution Approach 1:
The patent integrates the supply valve and bypass valve into a single compact valve assembly, reducing the spatial footprint required for multiple separate valves. The shared actuator and integrated body structure eliminate the need for multiple discrete components, thereby reducing the overall system size while maintaining independent control capability for precise flow rate management
Solution Approach 2:
The bypass valve is arranged within the valve body in a nested configuration, with the bypass passage integrated into the overall valve structure. This nesting arrangement allows the bypass valve to occupy space within the existing valve body volume rather than requiring additional external space, effectively reducing the total system size while maintaining both valve functions
Data Source
AI summary
The air valve includes a supply valve configured to open and close an air supply passage through which the air gas to be supplied to the fuel cell stack from outside flows; a switching valve configured to switch between a state in which the air gas supplied from the outside flows through the air supply passage and a state in which the air gas supplied from the outside flows through a bypass passage that branches from the air supply passage; and a link mechanism connected to the supply valve and the switching valve and configured to actuate the supply valve and the switching valve. The link mechanism includes an arm portion fixed at the supply valve; and a cam plate fixed at the switching valve, wherein the cam plate includes a guide portion with which the arm portion is to contact.