Fuel Cell Air Compressor Bearing Durability Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Air foil bearings in fuel cell systems face issues with reduced air supply at low revolutions per minute, leading to abrasion and damage, while excessive air supply can cause dry-out phenomena due to insufficient humidification, affecting system stability and durability.
Innovation Solution
A fuel cell system structure and method incorporating a flow sensor, air compressor with an air foil bearing, and a flow adjuster, such as an exhaust pressure adjusting valve or bypass valve, to regulate air supply and recirculate excessive air, ensuring stable operation by adjusting the air flow based on the required amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the air compressor driving revolutions per minute is reduced to match minimal air requirements, then energy consumption is reduced, but the air foil bearing cannot maintain lift-off condition causing rotor contact and bearing damage
Solution Approach 1:
The control unit continuously monitors the actual air supply amount and compares it with the required air supply amount, adjusting the air compressor driving revolutions per minute based on this feedback to maintain optimal operation while preventing bearing contact
Solution Approach 2:
The system dynamically changes the driving revolutions per minute parameter of the air compressor based on actual air supply requirements, maintaining it above the lift-off threshold when minimal air is needed to prevent bearing contact while reducing energy consumption
2Reliability
If the air compressor driving revolutions per minute is increased to maintain lift-off condition, then bearing durability is improved, but excessive air supply occurs causing dry-out phenomenon in the fuel cell system
Solution Approach 1:
The system adjusts the air compressor driving revolutions per minute parameter dynamically, reducing it when minimal air supply is sufficient to prevent bearing contact, thereby avoiding excessive air supply that would cause dry-out phenomenon
Solution Approach 2:
The control unit uses feedback from air supply amount sensors to adjust the compressor speed, ensuring air supply matches actual requirements and preventing both bearing contact and dry-out phenomenon
3Volume of moving object
If the air compressor size is reduced using air foil bearing, then system compactness is improved, but control precision for maintaining minimum revolutions per minute becomes more difficult
Solution Approach 1:
The control unit continuously monitors the actual driving revolutions per minute of the compact air compressor and adjusts it to maintain the lift-off condition, compensating for the reduced size and enabling precise control despite the compact design
Solution Approach 2:
The system replaces traditional contact bearings with air foil bearings, enabling compact compressor design while using electronic control and feedback mechanisms to maintain precise operating 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
The solution stabilizes the air compressor operation by adjusting air supply and recirculating excess air, preventing damage and dry-out phenomena, thereby enhancing the durability and marketability of the fuel cell system.
Implementation Method 1
an air foil bearing to maintain minimum driving revolutions per minute or greater
Data Source
AI summary
A structure of a fuel cell system and a controlling method thereof are provided. The structure of the fuel cell system includes a flow sensor that is configured to detect a flow of air introduced into the fuel cell system and an air compressor that is configured to compress the introduced air and has an air foil bearing to maintain minimum driving revolutions per minute or greater. Additionally, the system includes a flow adjuster that is connected to the fuel cell system. Accordingly, since an amount of air corresponding to a required amount of air of the fuel cell system is supplied by limiting or recirculating an excessive air supply while securing durability and durability of abrasion of the air compressor to which the air foil bearing is applied, a dry phenomenon of the fuel cell system including a stack due to the excessive supply of air is prevented.