Aeration Device Venturi Mixing Chamber
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Solution Overview
Problem
Conventional aeration devices in the sewage treatment industry produce low-oxygen-content air-liquid mixed fluids and have relatively low aeration efficiency.
Innovation Solution
The aeration device incorporates a flow mixing chamber with a gradually reducing cross-sectional area, utilizing the Venturi effect to create a suction force that draws air through air inlet holes, mixing with liquid flow to produce high-density small-diameter air bubbles, enhancing oxygen dissolution and aeration efficiency. This design includes a conical pipe structure, multiple air inlet holes, and a porous screen with specific hole configurations to optimize bubble size and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional aeration devices are used, then the structure is simple, but the aeration efficiency is low and oxygen dissolution rate is low
Solution Approach 1:
The air inlet hole is segmented into multiple smaller holes instead of a single large hole. This segmentation creates numerous small air bubbles that increase the total surface area for oxygen transfer, thereby improving aeration efficiency and oxygen dissolution rate without requiring complex external components.
Solution Approach 2:
The cross-sectional area of the flow mixing chamber is gradually reduced along the liquid flow direction, changing the geometric parameter to create a Venturi effect. This parameter change generates suction force that draws air through the air inlet hole, improving mixing efficiency and oxygen dissolution without adding mechanical complexity.
2Quantity of substance
If air inlet hole size is increased, then air flow intake is improved, but air bubble size increases reducing dissolution efficiency
Solution Approach 1:
The air inlet hole is divided into multiple smaller holes, which allows sufficient air flow intake while producing small air bubbles. The small bubble size increases the total surface area for oxygen transfer, thereby maintaining high oxygen dissolution rate despite increased air intake capacity.
3Force
If the flow mixing chamber cross-sectional area is reduced, then suction force is improved, but chamber volume decreases
Solution Approach 1:
The cross-sectional area of the flow mixing chamber is gradually reduced along the liquid flow direction, creating a tapered geometry. This parameter change generates a Venturi effect that produces strong suction force to draw air through the air inlet hole, while the gradual reduction allows the chamber to maintain sufficient volume for effective mixing.
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 device achieves a high oxygen dissolution rate and aeration efficiency by producing small-diameter air bubbles that rapidly mix with liquid flow, ensuring thorough oxygen dissolution and improved mixing across the fluid's entire volume.
Implementation Method 1
due to the Venturi effect, the liquid flow generates a suction force while flowing through the flow mixing chamber
Data Source
AI summary
An aeration device pertaining to the technical field of sewage treatment includes a flow mixing chamber and an air inlet chamber. The flow mixing chamber has a liquid inlet opening, a liquid outlet opening, and an air inlet hole penetrating the chamber wall and located inside the air inlet chamber. The air inlet chamber has an air inlet opening and an interior space whose cross-sectional area is gradually reduced along the liquid flow direction in the flow mixing chamber. The cross-sectional area and number of the air inlet hole can be properly set in order for the mixed fluid produced by the aeration device to have relatively high-density small-diameter air bubbles that contribute to mixing the liquid flow and air flow sufficiently, dissolving oxygen rapidly and sufficiently into the liquid flow, increasing the oxygen dissolution rate of the mixed fluid, and enhancing aeration efficiency.