Sheet Metal Gas Burner Apertures to Prevent Flashback
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Solution Overview
Problem
Conventional gas burners with thin sheet metal covers experience issues with detonation when switching from maximum to minimum gas flow, particularly with liquefied gas, leading to increased minimum flow rates and reduced operating range due to the design of apertures for flame generation.
Innovation Solution
A gas burner design featuring a sheet metal cover with elongated apertures that generate an upwardly directed flame ring, utilizing a cover made of thicker metal (1.0-1.7 mm) with apertures of 3.0-7.0 mm height and 1.0-1.7 mm width, which directs main flames vertically, reducing the risk of flashback and allowing a wider operational range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thin sheet metal cover is used for the burner, then the manufacturing cost is reduced and the structure is simplified, but detonation occurs when switching from maximum to minimum gas flow with liquefied gas
Solution Approach 1:
The patent changes the geometric parameters of the apertures by making them elongated rather than circular, with specific dimensions (3.0-7.0 mm height and 1.0-1.7 mm width). This parameter modification allows the thin sheet metal cover to prevent detonation while maintaining manufacturing cost advantages, as the elongated shape controls gas flow more effectively during transition between maximum and minimum flow positions.
2Ease of manufacture
If conventional aperture designs are used in thin sheet metal covers, then manufacturing is simpler, but the minimum flow rate must be increased which reduces the operating range
Solution Approach 1:
The patent modifies the aperture parameters by creating elongated openings with controlled dimensions (3.0-7.0 mm height and 1.0-1.7 mm width) rather than using conventional circular holes. This parameter change enables the burner to maintain a low minimum flow rate while preventing detonation, thereby extending the operating range from minimum to maximum flow position without compromising manufacturing simplicity.
3Device complexity
If large holes are used for flame generation, then the structure is simpler, but the appearance is less pleasant and technical limitations occur
Solution Approach 1:
The patent changes the aperture geometry from large circular holes to elongated openings with specific dimensions (3.0-7.0 mm height and 1.0-1.7 mm width). This parameter modification creates a more aesthetically pleasing appearance with a pattern of slender openings while maintaining structural simplicity. The elongated shape also provides technical advantages by controlling gas flow and preventing detonation.
Solution Approach 2:
The patent transitions from circular (isotropic) aperture geometry to elongated (anisotropic) geometry, effectively adding directional dimensionality to the aperture design. This dimensional change creates an aesthetically pleasing pattern of vertical slits while maintaining the simplicity of a single-piece sheet metal construction, resolving the contradiction between structural simplicity and appearance.
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 efficient burner operation with low minimum power and a wide operational range while preventing small explosions and flashback, even with liquefied gas, by directing flames upward and maintaining a thin cover structure.
Implementation Method 1
defining therewith at least one radial venturi effect chamber
Implementation Method 2
elongated apertures... which directs main flames vertically
Data Source
Figure 1~3
AI summary
An improved gas burner, comprising: - an injector holder (2) fixable to the sheet metal (8) of a cooking hob and provided on its base with an injector (10), - a burner body (14) associated with the injector holder (2) and adapted to define with the sheet metal (8) a circumferential passage for the entry of primary air intended to form the combustion mixture with the gas leaving the injector (10), - at least one cover (28), -- formed from a single piece of drawn sheet metal, -- positioned on the burner body (14) and defining therewith at least one radial venturi effect chamber (36), -- comprising a circumferential flange (30) provided with a plurality of elongated apertures (32, 40) of essentially vertical extension, for passage of the combustion mixture to generate a ring of main flames (34).