Bubble Generating Device Throat for Sewage Purification
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Solution Overview
Problem
Conventional bubble mixing devices for sewage purification generate cavitation and bubble collapse due to variations in water pressure, leading to inefficient bubble generation and purification, as they rely on slow spiral water flows rather than accelerated flows.
Innovation Solution
A bubble generating device with a throat portion between the air injection port and microbubble generating means, which narrows the flow path, accelerating the bubble and water flow, causing high-speed collisions that produce microbubbles and strong cavitation, enhancing purification efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spiral water flow is used to mix bubbles into sewage, then mixing is facilitated, but water flow speed decreases and cavitation generation is disturbed
Solution Approach 1:
The device divides the flow path into distinct segments: a lower mixing section with spiral blades for bubble incorporation, and an upper acceleration section with a throat portion for flow velocity increase. This segmentation allows each section to perform its specific function optimally without interfering with the other.
Solution Approach 2:
The device transitions the water flow from a slow spiral motion in the lower section to a high-speed upward flow in the upper section through the throat portion. This dynamic change in flow characteristics enables both effective mixing and cavitation generation at different stages of the purification process.
2Quantity of substance
If air is discharged from injection port to generate bubble flow, then oxygen supply is provided, but power consumption increases
Solution Approach 1:
The system utilizes the natural buoyancy force of rising bubbles and the kinetic energy of upward water flow to draw surrounding water into the throat portion through the Venturi effect. This self-service mechanism reduces the burden on the blower, allowing it to operate at lower power consumption while still achieving effective bubble generation and mixing.
3Speed
If throat portion narrows flow path to accelerate bubble flow, then cavitation is generated, but flow path resistance increases
Solution Approach 1:
The device employs hydraulic principles by utilizing the pressure differential created in the throat portion to accelerate flow and generate cavitation. The narrowing of the flow path converts pressure energy into kinetic energy, achieving high-speed flow necessary for cavitation while the subsequent expansion section recovers some pressure, minimizing overall pressure loss.
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 efficiently generates microbubbles and strong cavitation, effectively disinfecting bacteria and microorganisms by mechanical impact, while reducing power consumption and increasing bubble production, thus improving sewage purification efficiency.
Implementation Method 1
a throat portion for narrowing a flow path of bubble flow and water flow which rises in the outer cylinder is placed between the injection port and the microbubble generating means
Implementation Method 2
bubble flow injected from the injection port flows into the throat portion by buoyancy force and inertia force
Implementation Method 3
bubble flow injected from the injection port flows into the throat portion by buoyancy force and inertia force
Implementation Method 4
it was found that cavitation and the like were generated in the sewage and the like, this was bubble-collapsed by variation in water pressure and according to this, purification of sewage and the like can be carried out more effectively and efficiently
Implementation Method 5
This accelerated bubble group collides against the upper microbubble generating means at high speed, the bubble group finely bursts by this collision, and the finely bursted bubbles further burst by the pressure reduction caused by acceleration and become microbubbles
Implementation Method 6
cell membranes of bacterium and microorganism are crushed by mechanical impact force caused by generation and extinction of the steam bubbles of the cavitation
Data Source
AI summary
A bubble generating device for sewage purification includes: an outer cylinder 6 vertically placed in water; an injection port 2A placed at a lower central portion in the outer cylinder 6 for upwardly injecting air as bubble flow supplied from an air supply source; and microbubble generating device 3 placed higher than the injection port 2A for refining bubbles injected from the injection port 2A. A throat portion 30 for narrowing a flow path of bubble flow and water flow which rises in the outer cylinder 6 is placed between the injection port 2A and the microbubble generating device 3.