Oven Gas Burner Lattice Structure for Stable High Thermal Output
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Solution Overview
Problem
Existing gas burners for kitchen ovens face limitations in thermal power, flame stability, and noise due to mechanical energy from combustion gases, with previous designs either restricting thermal output or causing vibrations and hot spots.
Innovation Solution
A burner design featuring a lattice structure with a thicker pilot zone and main zone, along with a secondary air flow system, to increase thermal output while maintaining flame stability and preventing hot spots, utilizing a mesh with specific porosity and thickness ratios and a flame-holding device with a pilot ring and main disk to distribute gas mixture uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the flow rate of the air and flammable gas mixture increases to increase thermal output, then the thermal power increases, but the flame may detach from the burner
Solution Approach 1:
The lattice structure is divided into a pilot zone and a main zone with different thicknesses. The pilot zone, being thicker, slows down the gas mixture streams passing through it, creating conditions for stable flame ignition and attachment. The main zone allows higher flow rates for increased thermal output. This segmentation enables the burner to simultaneously achieve high thermal power and flame stability.
Solution Approach 2:
Different zones of the lattice structure have different local properties: the pilot zone has greater thickness to reduce gas flow velocity and ensure flame attachment, while the main zone has optimized porosity (60-90%) and thickness (3-8 mm) to allow high flow rates and thermal output. This local differentiation of properties resolves the contradiction between thermal power and flame stability.
2Power
If the flame is concentrated close to the flame-holding plate to increase thermal power density, then the thermal power per cm2 increases, but hot spots are created
Solution Approach 1:
The invention extends the combustion process in the axial dimension by creating a longer flame path through the lattice structure. The thicker pilot zone and optimized main zone thickness (3-8 mm) allow the flame to propagate further downstream, distributing heat over a larger volume and preventing concentration of thermal energy at a single location, thus eliminating hot spots while maintaining thermal power density.
Solution Approach 2:
The porosity of the lattice structure is optimized to 60-90%, and the thickness is set to 3-8 mm, which changes the flow and combustion parameters to achieve a longer, more distributed flame. This parameter optimization allows thermal energy to be released along the flame path rather than concentrated at the plate, preventing hot spots while maintaining power density.
3Reliability
If the lattice structure is made thicker to improve flame holding, then flame stability increases, but the device complexity and material usage increase
Solution Approach 1:
Instead of uniformly increasing the thickness of the entire lattice structure, the invention applies local quality by making only the pilot zone thicker than the main zone. The main zone maintains an optimized thickness of 3-8 mm with porosity of 60-90%, which provides sufficient flame holding without excessive material usage or complexity. This localized thickening achieves the required reliability while minimizing device complexity.
4Object-affected harmful factors
If the flame is spread out to reduce hot spots, then thermal distribution improves, but the thermal power density decreases
Solution Approach 1:
The porosity of the lattice is optimized to 60-90%, which changes the flow distribution parameters to achieve uniform thermal distribution while maintaining high thermal power density. The specific thickness range of 3-8 mm for the main zone and greater thickness for the pilot zone further optimize these parameters, allowing the flame to spread evenly without sacrificing power density.
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 burner achieves increased thermal power without flame separation, spreads the flame to prevent hot spots, and reduces noise by harmonizing gas flow speeds and using secondary air to regulate combustion conditions, enhancing operational stability and longevity.
Implementation Method 1
The mesh has a porosity of between 60% and 90%
Implementation Method 2
The energy produced by combustion is recovered in the form of heat
Implementation Method 3
the combustion products of the gas pass through, for example, heat exchanger tubes where they are cooled to extract the thermal energy
Implementation Method 4
the combustion products of the gas pass through, for example, heat exchanger tubes where they are cooled to extract the thermal energy
Data Source
Figure 1
Figure 2
AI summary
The burner has a flame holding device (7) separating flame (27) from a mixing chamber receiving flow of main air and gas to constitute a gaseous mixture (26). The device has a lattice (35) with metallic wires, for passing the mixture. The lattice has a control ring (32) with thickness larger than the thickness of a central part (31a) of a main disc (31) based on a flame`s main direction (28) for slowing down the mixture crossing the part with respect to the mixture crossing the ring. Peripheral orifices (24) situated around the device permit an air flow (39) to be guided toward the flame.