Compact Fan Unit for Gas Burners with Radial Intake
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Solution Overview
Problem
Existing fan units for gas burners are bulky due to the external structure required for conveying air and gas to the combustion head, which limits space efficiency and pre-mixing functionality.
Innovation Solution
A centrifugal fan unit with an integrated design where the intake section is positioned on the same side as the combustion head, utilizing separate conveying means to direct air and gas flows within the burner body, allowing for efficient pre-mixing and compactness by intersecting flows within the burner's internal space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the intake section of the fan is positioned on the axially opposed side of the combustion head, then the fan can be driven by a motor mounted on the gate, but the structure becomes bulky externally of the combustion chamber
Solution Approach 1:
The patent repositions the intake section from the axial opposite side to the radial side of the combustion head, changing the spatial arrangement from one-dimensional axial alignment to two-dimensional radial positioning. This allows the fan to be mounted on the combustion head itself rather than requiring external gate mounting, thereby reducing the external bulkiness while maintaining operational functionality
2Productivity
If separate conveying means are used to convey air and gas flows, then pre-mixing efficiency is improved, but device complexity increases
Solution Approach 1:
The patent integrates the conveying means for air and gas into a unified structure where the fan housing and combustion head form a combined system. The air inlet and gas inlet are positioned to allow their flows to mix within the same spatial envelope, and the fan blades themselves serve dual purposes of moving air while facilitating gas-air mixing, thereby reducing structural complexity while maintaining pre-mixing efficiency
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 reduces overall dimensions, enhances pre-mixing efficiency, improves quietness, and incorporates multiple functions within each component, resulting in a more compact and cost-effective fan unit with improved performance.
Implementation Method 1
The fan is of the centrifugal type and comprises a bladed impeller 4
Data Source
AI summary
A fan unit for gas burners (3) with pre-mixing is described, of the type comprising a combustion head (2) and first conveying means (13) for conveying a combustible air/gas mixture fed to the delivery side of the fan in the direction of the head (2), the fan unit comprising a radial impeller (4) and a manifold (5) for housing the impeller, the fan being provided with at least one intake section (6) and at least one delivery section (7) for the flow which are defined in the manifold, drive means (8) being provided for rotating the impeller (4) about an axis of rotation (X), wherein the intake section (6) of the fan is disposed on the same side as the combustion head (2) and wherein second conveying means (14) are provided for conveying the flow of air and/or gas between the head (2) and the impeller (4) in the direction of the intake section (6).