Air Spreading Device Nozzle Design for Uniform Flow
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Solution Overview
Problem
Existing wind scattering devices for producing grit mats in wood-based panel production face challenges in achieving uniform air flow distribution and efficient particle separation, leading to inconsistencies in panel quality and increased power consumption due to high pressure losses.
Innovation Solution
The design features outlet nozzles with a funnel-shaped transition from a rectangular inlet to a round or oval outlet cross-section for reduced pressure losses and easy cleaning, along with a register unit with height-adjustable register strips to vary air flow distribution across the width and height, and multiple fans at different heights to optimize flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional outlet nozzles with abrupt transitions are used, then manufacturing is simpler, but pressure losses increase and air flow uniformity deteriorates
Solution Approach 1:
The outlet nozzles feature a funnel-shaped design with curved transitions from rectangular inlet to round/oval outlet cross-sections. This curvature eliminates abrupt angular transitions, reducing flow separation and pressure losses while maintaining manufacturing feasibility through standard forming processes.
Solution Approach 2:
The nozzle geometry progressively changes parameters along the flow path: the cross-sectional shape transitions from rectangular to round/oval, and the area gradually increases. These continuous parameter changes optimize flow characteristics and reduce energy losses.
2Adaptability or versatility
If conventional fixed air distribution is used, then device structure is simpler, but adaptability to different production conditions deteriorates
Solution Approach 1:
The register strips are made height-adjustable, transforming the static air distribution system into a dynamic one. This allows the nozzle outlet cross-sections to be varied in height, enabling adaptation to different production conditions and air flow requirements.
Solution Approach 2:
The register unit is divided into multiple height-adjustable register strips that can be independently positioned. This segmentation allows precise control over air distribution characteristics without requiring complete system redesign for different conditions.
3Ease of repair
If complex nozzle geometries are used to improve cleaning access, then ease of cleaning improves, but manufacturing complexity increases
Solution Approach 1:
The funnel-shaped nozzle design with round/oval outlet cross-sections eliminates corners where particles could accumulate. The curved surfaces are inherently easier to clean than angular geometries, and can be manufactured using standard forming processes for metal or plastic materials.
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 solution enables the production of high-quality grit mats with reduced power consumption and improved uniformity in air flow, allowing for targeted adjustment of air distribution and flow conditions, resulting in more economical and efficient operation.
Implementation Method 1
outlet nozzles with a funnel-shaped transition from a rectangular inlet to a round or oval outlet cross-section for reduced pressure losses and easy cleaning
Implementation Method 2
register unit with height-adjustable register strips to vary air flow distribution across the width and height
Implementation Method 3
one or more fans for generating air currents for separating the grit in the wind scattering chamber
Data Source
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AI summary
The invention relates to an air spreading device spreading bulk materials to a bulk material belt type conveying device. The air spreading device at least comprises an air spreading chamber; the air spreading chamber comprises an upper part bulk material opening, one or more than one air flow draught fan for separating bulk materials in the air spreading chamber, an air supply housing and a nozzle unit which is adjacent to an air supply housing in a flow direction. The nozzle unit comprises a plurality of nozzle chambers of the discharge nozzles which are arranged in columns or in rows; and the cross sections of the discharge nozzles are reduced from rectangle input cross sections to elliptical output cross sections along a flow direction in a funnel shape manner. The invention also relates to a bulk material device for manufacturing a bulk pad of a material flat plate. The bulk material device has an air spreading device and has at least one bulk material chamber positioned above the spreading device and a bulk material transmission device arranged under the spreading device.