Sheet-Metal Gas Burner Layout for Flame Return Prevention
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Solution Overview
Problem
Traditional gas burners with sheet metal covers suffer from inefficient flame direction and increased risk of flame return due to small thickness and inclined apertures, leading to reduced cooking efficiency and design issues with small-thickness cooking hobs.
Innovation Solution
A gas burner design featuring a cup-shaped support, a flame divider with a frusto-conical conduit, and a discoidal cover with inclined radial apertures that create a radial venturi effect chamber, allowing for optimal flame direction and prevention of flame return, while being made from enamelable sheet metal for ease of cleaning and low cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sheet metal cover with punched apertures is used to reduce burner height and cost, then manufacturing cost and ease of cleaning are improved, but flame direction control deteriorates and flame return risk increases
Solution Approach 1:
The patent introduces a flame divider as an intermediary component between the gas outlet and the sheet metal cover. This flame divider, made of die-cast aluminium with a frusto-conical conduit, properly directs the flames before they reach the cover apertures, while the sheet metal cover serves as a separate structural element for height reduction and ease of cleaning.
Solution Approach 2:
The burner is segmented into distinct functional components: a die-cast aluminium flame divider with frusto-conical conduit for flame direction, and a separate sheet metal cover with punched apertures for structural support and height reduction. This segmentation allows each component to optimize its specific function without compromise.
2Adaptability or versatility
If the burner height is reduced to match small-thickness cooking hobs, then adaptability to modern cooking hobs is improved, but flame direction control and efficiency deteriorate
Solution Approach 1:
The patent resolves the height contradiction by transitioning to a sheet metal cover construction that enables significant height reduction in the vertical dimension, while the frusto-conical conduit in the flame divider compensates by optimizing flame direction through its geometric shape, maintaining efficiency despite the reduced overall height.
3Ease of operation
If traditional die-cast aluminium covers with radial recesses are used, then flame direction is improved, but manufacturing cost and cleaning difficulty increase
Solution Approach 1:
The patent merges the flame direction function into the die-cast aluminium flame divider component with its frusto-conical conduit and radial slots, while the sheet metal cover provides a simpler, more economical structure with punched apertures. This combination achieves both good flame direction and lower manufacturing cost.
4Ease of manufacture
If apertures with small axial extension are used in the cover, then manufacturing simplicity is improved, but flame return risk increases
Solution Approach 1:
The flame divider acts as an intermediary that prevents flame return by properly directing the flames through its frusto-conical conduit and radial slots, allowing the use of simple punched apertures in the sheet metal cover without creating flame return risks.
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 flame direction, prevents flame return, and allows for a compact, aesthetically pleasing burner with high efficiency and low cost production, suitable for small-thickness cooking hobs.
Implementation Method 1
the radial slots (24) provided in the raised band (22) and the radial apertures (46) provided in the cover (12) being directed such as to face one another, with the axis which perpendicularly traverses said apertures (46) being inclined, so as to create a radial venturi effect chamber
Data Source
AI summary
A gas burner for cooking equipment, such as a cooking hob, includes a supporting cup-shaped injector holder fixable in a position corresponding to an opening in the cooking hob in which the burner is to be installed, a flame divider resting on the cup-shaped support to define, with its outer circumferential rim and with the surface of the cooking hob in which the burner to be installed, a passage for the entry of a flow of primary air, a sheet metal cover removably resting on the flame divider and defining therewith a distribution chamber for the combustion mixture of gas and primary air, wherein the distribution chamber is bounded by a raised band, in which radial slots are provided for passage of the combustion mixture, the cover having apertures facing the radial slots and cooperating therewith to define the inclination of the flames emerging from the apertures.