Double Vortex Burner Horizontal Venturi Ejectors
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Solution Overview
Problem
Conventional atmospheric gas burners for cooking tops face inefficiencies in producing stoichiometric air-gas mixtures, leading to incomplete combustion, excessive carbon monoxide production, and limited power density, which restricts modulation ratios and increases vertical space requirements.
Innovation Solution
The design incorporates multiple Venturi ejectors with optimized geometries, including a rectilinear axis and spiral diffuser, to create a Double Vortex Burner (DVB) that achieves stoichiometric or leaner mixtures without secondary air, reducing vertical space and enhancing power density and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional atmospheric gas burners use traditional Venturi ejectors, then the device structure is simple, but the combustion efficiency is low and carbon monoxide production is excessive
Solution Approach 1:
The diffuser is divided into multiple sections with different divergence angles. The first section has a smaller divergence angle (5-15 degrees) for stable flow, while the second section has a larger divergence angle (15-30 degrees) for pressure recovery, optimizing both combustion efficiency and structural feasibility
Solution Approach 2:
The patent optimizes key geometric parameters including the nozzle diameter (0.5-2mm), throat length-to-diameter ratio (5-15), and diffuser lengths (L1: 10-50mm, L2: 20-80mm) to achieve stoichiometric mixing while maintaining practical device dimensions
2Loss of energy
If the Venturi throat length is increased to improve mixing efficiency, then combustion efficiency improves, but the vertical space requirement increases
Solution Approach 1:
The patent transitions from a purely vertical Venturi configuration to a horizontal orientation with the diffuser extending radially outward. This allows the throat length to be sufficient for mixing (L20 = 5-15D) while the overall vertical profile remains compact, fitting modern cooking top designs
Solution Approach 2:
The diffuser employs curved, spiral geometry instead of straight linear extensions. The spiral diffuser creates vortex flow that enhances mixing efficiency within a compact space, reducing the required vertical distance while maintaining adequate mixing length
3Loss of energy
If the diffuser opening angle is increased to improve pressure recovery, then ejector efficiency improves, but flow instability and stall occur
Solution Approach 1:
The diffuser is segmented into two sections with different opening angles. The first section uses a smaller angle (5-15 degrees) to maintain attached flow and stability, while the second section uses a larger angle (15-30 degrees) to maximize pressure recovery, preventing stall throughout the entire diffuser
Solution Approach 2:
The patent optimizes the diffuser length-to-diameter ratios (L1/D = 10-50, L2/D = 20-80) and opening angles to achieve the optimal balance between pressure recovery and flow stability, maximizing ejector efficiency without causing stall
4Productivity
If conventional burners use vertical Venturi configuration, then the structure is compact, but the modulation ratio is limited and power density is low
Solution Approach 1:
Multiple Venturi ejectors are combined with their diffusers merging into a common combustion chamber. This allows individual ejectors to be optimized for high power density while the combined system achieves high modulation ratio through coordinated operation of multiple ejectors with different flow rates
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 DVB burner achieves higher efficiency, reduced vertical space, increased power modulation, and stable combustion, eliminating the need for secondary air and minimizing carbon monoxide production, while allowing for modular construction and discrete power adjustment.
Implementation Method 1
the pressure energy of a motor fluid available at a nozzle located at the inlet of a Venturi tube with nozzle flow rate Qm and nozzle pressure Pm, is transformed into kinetic energy; the high-velocity jet coming out from the nozzle induces and drags an induced fluid flow at a lower pressure Pi
Implementation Method 2
both flows are conveyed within a pipe having section Athr (which is the Venturi throat) where they mix and recover part of the pressure
Implementation Method 3
the mixing continues in a diverging section (which is the Venturi diffuser) where additional kinetic energy is recovered in static pressure
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The object of the present invention is an atmospheric gas burner (300) for cooking tops (400), in particular household cooking tops (400), where the air-gas mixture is obtained by the effect of the gas supply pressure using the principle of the tube ejector (10; 310) of Venturi that has a sufficient quantity Z ≥ 1 of ejectors (310) to supply, globally, the maximum power (Wb) provided for the same burner (300). Each of said ejectors (310) develops on a horizontal plane, has the axis of its diffuser (315) which in the first stretch (322) is substantially rectilinear and tangential to a circle with centre on the central axis (324) of said burner (300) while in the second stretch (323) gradually bends substantially as a spiral towards the same central axis (324), leads, downstream of said diffuser (315), to - a converging channel (327) which gradually bends vertically upwards and which, in turn, leads to one or more diffusion chambers (328) to which one or more flame spreading caps (318) act as a cover.