Soot-Exhausting Hood with Deflection Plates to Prevent Vortex Leakage
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Solution Overview
Problem
Conventional soot-exhausting devices suffer from leakage of pollutants due to large recirculation bubbles and three-dimensional vortices, which are not effectively addressed by adding side plates, leading to incomplete prevention of soot dispersion and leakage.
Innovation Solution
The device incorporates left and right deflection plates at the front end of upright plates, along with top plates and air blow grooves, to manage airflow and prevent recirculation bubbles and vortices from reaching the front edge, guiding pollutants away from the original entrance path and into the air-extraction slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If side plates are added to prevent recirculation bubbles, then pollutant leakage is reduced, but three-dimensional vortices and strong turbulences are produced at the cross of the flange and side plate
Solution Approach 1:
The side plates are segmented into multiple parts: the first side plate (b1) extends from the flange, and the second side plate (b2) is positioned further forward, creating distinct flow control zones. This segmentation allows the device to manage different flow patterns (recirculation bubbles and three-dimensional vortices) in separate regions, reducing overall flow complexity while maintaining pollutant containment effectiveness.
Solution Approach 2:
The invention extends the side plates in the forward direction (toward the user) rather than only vertically or horizontally. By adding the second side plate (b2) that protrudes forward from the first side plate (b1), the device controls flow in the forward dimension, effectively suppressing three-dimensional vortices at the flange-side plate cross without creating additional harmful flow patterns.
2Productivity
If extraction force is enhanced to improve extraction capacity, then pollutant capture is improved, but noise increases and energy is wasted
Solution Approach 1:
The side plates (b1 and b2) are positioned to preliminarily guide and organize the airflow before it reaches the air-extraction slot. By pre-controlling the flow patterns and preventing recirculation bubbles and three-dimensional vortices upstream, the extraction device operates more efficiently with reduced energy loss and lower noise, while maintaining high extraction capacity.
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 effectively prevents the leakage of soot pollutants by controlling airflow and vortices, ensuring that pollutants are drawn into the extraction slot and not recirculated or dispersed, thereby enhancing the extraction efficiency and reducing energy waste.
Implementation Method 1
the speed of updraft would increase due to the large buoyant effect resulted from high temperature of fire
Implementation Method 2
the soot and pollutants would disperse out easily from the front, the rear, and the lateral sides of the range hood due to turbulent diffusion and expansion effect caused by the high temperature of fire
Data Source
AI summary
A soot-exhausting device is provided with a left and a right upright plate. A front end of the left upright plate is bended and extended to form a first upright plate and a left deflection plate. The upper part of the free end of the left deflection plate is bended rightwardly to form a left top plate. A front end of the right upright plate is bended and extended to form a second upright plate and a right deflection plate. The upper part of the free end of the right deflection plate is bended leftwardly to form a right top plate. The bottom of the air-extraction hood is provided with a left and a right air blow groove that are respectively in elongate shape and parallel to top side of the left and the right top plate and located at the rear end of each top side.