Biomass Furnace Air Regulator Locking Device
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Solution Overview
Problem
Biomass furnaces face issues with air supply interruption due to power failures or control system errors, leading to incomplete combustion, increased pollutants, soot formation, and safety hazards from lack of oxygen, especially in airtight low-energy houses.
Innovation Solution
An air control element safety device is integrated into the biomass furnace to ensure a minimum air supply is maintained by locking the air control device in a position that allows a predetermined amount of air to flow, even during power failures or control malfunctions, using a mechanical fuse mechanism that secures the air flow path and prevents complete closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrically controlled air flaps are used to optimize combustion, then combustion efficiency is improved, but reliability deteriorates due to power failures or control system errors causing air supply interruption
Solution Approach 1:
The patent implements a mechanical backup system (air inlet openings with thermostats) that provides predetermined minimum air supply before electrical control failure occurs. This cushioning mechanism ensures that even when electrical control fails, the combustion process continues with sufficient air supply, preventing complete combustion interruption and maintaining basic operational reliability.
Solution Approach 2:
The patent introduces thermostats as intermediary devices that mechanically sense combustion conditions and automatically regulate air supply through air inlet openings. This intermediary mechanism bridges the gap between combustion needs and air supply, providing a fail-safe that operates independently of electrical control systems, thus resolving the reliability issue while maintaining combustion efficiency.
2Productivity
If air flaps are closed to control air supply, then combustion optimization is improved, but safety deteriorates due to insufficient oxygen supply leading to incomplete combustion and pollutant formation
Solution Approach 1:
The patent provides predetermined minimum air inlet openings that ensure sufficient oxygen supply is always available as a safety cushion. Even when air flaps close for combustion optimization, these openings maintain baseline oxygen flow, preventing complete oxygen deprivation and the associated harmful effects of incomplete combustion and pollutant formation.
Solution Approach 2:
The patent employs thermostats that continuously monitor combustion conditions and provide feedback to automatically adjust air supply through air inlet openings. This feedback mechanism ensures that oxygen supply remains sufficient to prevent incomplete combustion, while still allowing air flap closure for combustion optimization when conditions permit.
3Reliability
If mechanical air control devices are used to ensure minimum air supply, then safety is improved, but device complexity increases compared to simple electrical control
Solution Approach 1:
The patent divides the air control system into distinct functional segments: electrical control for optimization, mechanical thermostats for safety, and predetermined air inlet openings for minimum supply guarantee. This segmentation allows each component to perform its specific function independently, improving overall reliability while maintaining manageable complexity through functional separation.
Solution Approach 2:
The patent designs the air control system where components serve multiple functions: air flaps provide both primary control and safety backup, thermostats offer both automatic regulation and fail-safe operation, and air inlet openings serve both minimum supply and emergency air intake. This multi-functionality reduces the need for separate dedicated safety devices, thereby limiting complexity increase while improving safety.
Data Source
Figure 1
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AI summary
The firewood oven (1) has combustion chamber (2), and and air supply (9) for the combustion chamber. An air control unit (12) is provided in air supply to control the amount of air (10) led by air supply. An air adjusting element fuse is secured to the air control unit, such that it conducts predetermined minimum amount of air through the air supply. An independent claim is included for method for controlling biomass furnace.