Pellet Patio Heater Ventilated Chamber to Prevent Hopper Fires
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Solution Overview
Problem
Wood pellet patio heaters face challenges in keeping the pellet hopper cool to prevent unwanted fires, which complicates manufacturing, increases costs, and affects structural integrity and aesthetics, while traditional propane heaters are expensive, environmentally unfriendly, and inefficient in heat distribution.
Innovation Solution
A patio heater design featuring a combustion chamber with a ventilated chamber between the pellet hopper and combustion chamber, allowing air flow through orifices, a flue for heat dispersal, and a heat deflector to direct heat radially, ensuring the pellet hopper remains cool and heat is efficiently distributed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pellet hopper is positioned adjacent to the combustion chamber to reduce manufacturing complexity and improve structural integrity, then manufacturing complexity and structural integrity are improved, but the risk of unwanted hopper fires increases due to heat exposure
Solution Approach 1:
The interior space of the housing is divided into separate chambers: a combustion chamber for burning pellets and a pellet hopper for storing pellets. These chambers are spatially segmented to allow the hopper to be positioned adjacent to the combustion chamber while maintaining functional separation, thus enabling easy manufacturing without compromising safety.
Solution Approach 2:
A barrier wall with orifices is introduced as an intermediary structure between the combustion chamber and the pellet hopper. This barrier allows controlled air flow through the orifices while physically separating the hot combustion zone from the pellet storage zone, preventing unwanted hopper fires even when the hopper is positioned adjacent to the combustion chamber.
2Object-affected harmful factors
If a ventilated chamber with orifices is introduced to prevent hopper fires, then hopper fire prevention is improved, but device complexity increases
Solution Approach 1:
The barrier wall serving as the combustor is designed with dual functionality: it acts as a physical separator between the combustion chamber and pellet hopper, and simultaneously serves as a ventilation structure with integrated orifices for controlled air flow. This multi-functionality prevents hopper fires without requiring additional separate ventilation components, thus avoiding increased device complexity.
3Power
If propane is used as fuel for outdoor heaters, then heat generation is effective, but cost and environmental impact increase due to expense and non-renewability
Solution Approach 1:
The fuel type is changed from propane to wood pellets, representing a fundamental parameter change in the chemical composition and properties of the fuel. Wood pellets are a renewable, biomass-based fuel that produces less harmful emissions compared to propane, thereby reducing environmental impact and operational costs while maintaining effective heat generation through controlled combustion.
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 design effectively prevents hopper fires, reduces manufacturing complexity and costs, enhances structural integrity and aesthetics, and provides efficient and environmentally friendly heat distribution using wood pellets instead of propane.
Implementation Method 1
a ventilated chamber between the combustion chamber and the pellet hopper, the ventilated chamber being enclosed by: the first barrier; the second barrier; and one or more surfaces comprising one or more orifices allowing air to pass through the ventilated chamber
Implementation Method 2
a flue for carrying heat from the combustion chamber
Implementation Method 3
a heat deflector disposed on the flue to deflect heat in a radial direction
Implementation Method 4
a combustion chamber configured to burn pellets
Data Source
AI summary
A heater may include a combustion chamber configured to burn pellets, the combustion chamber comprising a first barrier; a pellet hopper configured to contain the pellets, the pellet hopper comprising a second barrier; a ventilated chamber between the combustion chamber and the pellet hopper, the ventilated chamber being enclosed by: the first barrier; the second barrier; and one or more surfaces comprising one or more orifices allowing air to pass through the ventilated chamber; a flue for carrying heat from the combustion chamber; and a heat deflector disposed on the flue to deflect heat in a radial direction.