Grateless, back drafted and back fed pellet stove
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Solution Overview
Problem
Conventional wood pellet stoves are complex, difficult to maintain, expensive, and require significant electricity, making them unreliable and less popular during power failures.
Innovation Solution
A simplified pellet stove design that uses gravity to dispense pellets, eliminates the need for a burner basket, and operates on minimal electricity, featuring a pellet tube, insulator, deflector plate, and draft inducer, allowing for efficient combustion and easy assembly from few components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a conventional pellet stove system with pellet feeder and burner basket is used, then automated pellet feeding and combustion control are achieved, but device complexity and maintenance difficulty increase significantly
Solution Approach 1:
The patent removes the pellet feeder mechanism entirely from the system. Instead of automated feeding, pellets are manually loaded into a hopper and then gravity-fed through a simple auger or tube system to the burn pot, eliminating the complex electric motor-driven pellet feeder while maintaining adequate fuel delivery
Solution Approach 2:
The patent inverts the conventional approach by eliminating the automated pellet feeder and instead using a simple gravity-based delivery system combined with manual intervention. This reversal of the automation approach reduces complexity while achieving the essential function of pellet delivery
2Productivity
If a burner basket is used to hold pellets during combustion, then efficient burning is achieved, but the basket corrodes quickly under high temperatures and requires frequent replacement
Solution Approach 1:
The patent completely removes the burner basket from the system. Pellets are burned directly in the burn pot without being contained in a separate basket, eliminating the component that corrodes under high temperatures. The burn pot itself is designed to withstand the thermal environment without requiring frequent replacement
Solution Approach 2:
The patent merges the function of the burner basket with the burn pot structure. Instead of having a separate basket that holds pellets and is exposed to intense heat, the design integrates fuel containment and combustion in a single robust chamber that is designed to handle the thermal load
3Reliability
If exotic refractory materials are used to fabricate the burner basket to slow corrosion, then component durability is improved, but manufacturing cost increases significantly
Solution Approach 1:
By removing the burner basket entirely, the patent eliminates the need for expensive refractory materials. The burn pot is designed to handle the thermal load directly, allowing the use of simpler, more cost-effective materials that are easier to manufacture and replace
4Extent of automation
If multiple electric motors are used to drive the pellet feeder, combustion blower, and room air blower, then automated operation and combustion control are achieved, but electricity consumption increases significantly
Solution Approach 1:
The patent removes the electric motor that drives the pellet feeder. Pellet delivery is achieved through gravity and simple mechanical means that require minimal or no electrical power, dramatically reducing overall electricity consumption while maintaining adequate fuel delivery to the burn pot
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 reduces maintenance costs, minimizes exposure to high temperatures, operates independently of electricity, and provides consistent and efficient heat production, enhancing reliability and scalability.
Implementation Method 1
The draft inducer creates negative pressure inside the combustion chamber to draw combustion air through the pellet tube and across the combustion chamber
Implementation Method 2
pellets fall onto a flat surface... Pellets are dispensed by gravity into combustion zone
Implementation Method 3
Insulator prevents the flame from heating the pellets in pellet tube
Implementation Method 4
combustion is initiated... combustion air flow and the room air flow can be accurately controlled... source of clean heat
Data Source
AI summary
A system for combusting fuel comprising an apparatus that receives fuel that is characterized as comprising interstitial spacing and wherein oxidants pass through the interstitial spacing of the fuel to sustain a combustion reaction at the interface of a reaction chamber while the byproducts of combustion pass into the reaction chamber.