Concentric Burner Flame Divider Aperture Layout for Stable Ignition
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Solution Overview
Problem
Existing gas burner systems for cooking tops suffer from 'flame lift' phenomena due to uneven exit velocities of the primary air/gas mixture, leading to incomplete ignition and inefficiencies, particularly in 'double-crown' systems where the mixture impacts the inner wall of the central cup, causing variations in flow rates through the flame divider apertures.
Innovation Solution
The system features concentric burners with flame dividers having apertures oriented parallel to the vertical axis, preventing direct impact of the air/gas mixture on the inner wall of the cup, ensuring uniform exit velocities and adequate secondary air supply through strategically positioned passages, thereby generating a 'carpet flame' for improved combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gas inlet duct is centrally coupled to the outer burner in double-crown systems, then the structure is simplified, but the primary air-gas mixture impacts the inner wall of the central cup causing uneven exit velocities and flame lift phenomena
Solution Approach 1:
The patent extracts the gas inlet duct from the central position and relocates it to the peripheral region of the cup. This removes the source of the problem (central coupling) while preserving the functional requirements. The gas inlet duct is positioned to supply the outer burner without interfering with the inner burner's central cup structure, thereby eliminating the impact on the inner wall and the resulting uneven flow distribution.
Solution Approach 2:
The patent introduces a peripheral gas inlet duct as an intermediary structure that mediates between the gas supply system and the burners. This intermediary positioning allows the gas to be supplied to the outer burner while avoiding direct impact on the inner cup wall, thus resolving the conflict between structural simplicity and ignition stability.
2Ease of manufacture
If the primary air-gas mixture velocity varies significantly through flame divider apertures, then the structure is simple, but incomplete ignition and flame lift occur reducing combustion efficiency
Solution Approach 1:
The patent applies local quality by creating regions of different aperture characteristics within the flame divider. The flame divider includes apertures with varying sizes or distributions in different zones to compensate for the non-uniform flow of primary air-gas mixture. This ensures that each local region delivers the appropriate velocity for complete ignition, thereby improving combustion efficiency while maintaining manufacturing simplicity.
3Volume of moving object
If crown flame is emitted at insufficient height above the cooking top, then the burner structure is compact, but poor secondary air supply causes high CO, NO and CO2 emissions
Solution Approach 1:
The patent addresses the emission problem by introducing secondary air supply passages that deliver air from the vertical dimension (from below the cooking top) to the flame region. This three-dimensional air supply approach allows adequate secondary air mixing without increasing the vertical height of the burner assembly, thus maintaining compactness while reducing harmful emissions through improved 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
This design ensures uniform velocity distribution of the air/gas mixture, preventing 'flame lift' and promoting optimal gas efficiency while reducing manufacturing costs by eliminating the need for complex gas inlet duct configurations.
Implementation Method 1
the amount of heat necessary for cooking food is generated through combustion of a gas appropriately mixed with air
Implementation Method 2
supplying secondary air towards the flames in order to ensure a complete combustion
Data Source
AI summary
A system of gas burners for a cooktop includes a pair of concentric burners made up of an outer burner having a first cup and a first flame divider and an inner burner having a second cup and a second flame divider. The first and second flame dividers having respective first and second apertures to allow an air-gas mixture to escape and positioned to extend parallel to a vertical axis of the burners. The first cup includes a first Venturi element for supplying an air-gas mixture to a first chamber of the first cup. The second cup includes a second Venturi element for supplying an air-gas mixture to a second chamber of the second cup. The first and second Venturi elements are positioned horizontally along respective first and second axes, the first axis being located on an outside of an inner wall of the first cup.