Gas Burner Flame Stability via Segmented Injector Design
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Solution Overview
Problem
Gas burners with multiple flame rings are prone to flame extinguishing due to air movements and pressure changes, especially when the simmering flame ring is fed with a minimum gas flow, leading to instability and difficulty in adapting to different gas types.
Innovation Solution
A gas burner design featuring a cup-shaped support with separate injectors for main and simmering flames, where the simmering flame ring is fed with a minimal gas flow through a smaller outflow hole and protected from air movements by a flame divider and cover, ensuring stability and easy adaptation to various gas types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the simmering flame ring is fed with minimum gas flow, then the burner power delivery is reduced for low temperature cooking, but the flame becomes sensitive to air movements and pressure changes causing flame extinguishing
Solution Approach 1:
The burner is divided into two independent flame rings (main flame ring and simmering flame ring) with separate gas supply systems and injectors. This segmentation allows each ring to operate independently with optimized gas flow rates, enabling the simmering ring to receive minimum gas flow for low power operation while the main ring can compensate to maintain overall flame stability and prevent extinguishing.
Solution Approach 2:
A flame divider element is introduced as an intermediary component between the two flame rings. This element physically separates the flames and creates a protective barrier that shields the sensitive simmering flame from air movements and pressure changes, allowing it to operate stably at minimum gas flow rates without extinguishing.
2Device complexity
If the simmering flame ring is disposed on the circumferential wall, then the structure is compact, but the flame is exposed to air movements and streaming effects from below the cooking hob
Solution Approach 1:
The simmering flame ring is repositioned from the circumferential wall to a horizontal position on the top surface of the burner body, changing its spatial orientation from vertical to horizontal. This dimensional change allows the flame to be fed with primary air from above the cooking hob, placing it in a more stable airflow environment that is less susceptible to streaming effects and air movements from below the hob.
3Productivity
If the primary air feeding the simmering flame ring originates from below the cooking hob, then the air supply is readily available, but the flame is exposed to streaming effects and pressure reduction when doors are opened
Solution Approach 1:
The primary air supply direction is inverted from below the cooking hob to above the cooking hob. The second inlet for primary air is positioned on the top surface of the burner body, allowing air to be drawn from the stable region above the hob. This inversion eliminates exposure to streaming effects and pressure reductions that occur when doors below the hob are opened, while still providing adequate air supply for combustion.
4Adaptability or versatility
If a gas burner is designed with easy part replacement for gas type adaptation, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The injector components are designed as universal, interchangeable parts that can be easily replaced to adapt the burner to different gas types (natural gas, LPG, etc.). The injector assembly includes standardized elements such as the injector body, needle, and seat that work across multiple gas types, requiring only simple replacement rather than complex adjustment mechanisms. This maintains device simplicity while achieving high adaptability.
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 achieves stable flame operation at low power settings, resistant to air movement-induced extinguishing, and allows for easy replacement of parts for gas type adaptation, while maintaining a compact and economical structure suitable for various cooking hob installations.
Implementation Method 1
a first injector (6), which is positioned in the centre of said base and is intended to feed the main flame ring
Implementation Method 2
a flame divider (32) resting on the rim of said cup-shaped support and presenting an axial conduit (34) of frusto-conical shape coaxial to said first injector (6) and having its lower aperture facing said first injector (6)
Implementation Method 3
Gas burners with one or more flame rings are known, in particular gas burners with a ring of main flames positioned at a certain level of the burner
Data Source
Figure 1
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Figure 3
AI summary
A gas burner for cooking appliances, with a ring of main flames and a ring of simmering flames, characterised in that: - two superposed separate chambers (42, 50) are provided containing the gas and primary air mixture for feeding the main flame ring (60) and the simmering flame ring (62), - the chamber (42) containing the mixture for feeding the main flame ring (60) is bounded by a circumferential wall (36) with which a plurality of radial apertures (38) are associated for the outflow of said mixture, - the chamber (50) containing the mixture for feeding the simmering flame ring (62) is positioned above the preceding and closed upperly by a cover (48) which defines in its lower surface at least one passage (52, 54) for the outflow of said mixture and the formation of the simmering flame ring (62), - the edge of said cover (48) extends outwards beyond said passage (52, 54).