Fire Pit Air Passage Vortices for Hotter Combustion Air
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Solution Overview
Problem
Existing fire pits have low temperature and small flow rate air entering the combustion chamber, which limits the combustion efficiency of fuels like firewood or straw.
Innovation Solution
A fire pit design with a combustion chamber and air passage system where external air enters through inlets and vents, with vortex-generating portions on the inner plate to increase air flow velocity and contact area, enhancing heating and combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air is supplied through air passage from external environment, then combustion efficiency is improved, but air temperature is low and flow rate is small which limits combustion efficiency improvement
Solution Approach 1:
The patent applies preliminary action by pre-heating the air in the air passage using heat from the burning fuel before the air enters the combustion chamber. The air passage is positioned to allow heat transfer from the fuel combustion, thereby warming the incoming air and improving combustion efficiency.
Solution Approach 2:
The air passage acts as an intermediary between the external environment and the combustion chamber. It not only transports air but also serves as a heat exchange medium, absorbing heat from the combustion process to pre-heat the incoming air, thus mediating between cold external air and the high-temperature combustion zone.
2Productivity
If air is supplied through air passage from external environment, then combustion efficiency is improved, but air flow rate is small which limits combustion efficiency improvement
Solution Approach 1:
The air passage is designed to pre-accelerate air flow using the upward movement of hot gases from combustion. The configuration creates natural draft that increases air flow rate before air enters the combustion chamber, eliminating the need for additional fans or blowers.
Solution Approach 2:
The air passage maintains continuous air supply and heat exchange throughout the combustion process. The design ensures that as long as fuel is burning, air is continuously heated and supplied to the combustion chamber, maintaining steady combustion efficiency without interruption.
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 improves combustion efficiency by heating air before it enters the combustion chamber, increasing air flow velocity, and prolonging air stay time, leading to more efficient fuel burning and stable combustion.
Implementation Method 1
the main body inner plate is heated to heat the air entering the air passage
Implementation Method 2
the air in the air passage will form a vortex at the vortex-generating portions to increase the stay time of the air in the air passage
Implementation Method 3
the heated air enters the combustion chamber from the air vents to facilitate the combustion of the fuel
Data Source
AI summary
A fire pit includes a main body. The main body has a combustion chamber and an air passage communicating with the combustion chamber. The surface of the inner side of the air passage, close to the combustion chamber, has a plurality of vortex-generating portions. The fire pit can improve the temperature and the inflow of the air entering the combustion chamber from the air passage, thereby improving the combustion efficiency of the fuel burned in the combustion chamber effectively.