Fine bubble generating device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fine bubble generating devices struggle to produce a large amount of fine bubbles with diameters of several tens of micrometers or less, due to limitations in gas-liquid mixing efficiency and pressure differences within the device.
Innovation Solution
A fine bubble generating device is designed with a tubular body featuring reduced diameter portions and contiguous gas-liquid mixing portions, utilizing a compressor to pressurize gas, which is introduced through through holes along the circumferential direction, creating a Venturi effect for efficient gas-liquid mixing and bubble formation, maintaining high hydraulic pressure and producing fine bubbles with diameters of nano-order level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas is suctioned only due to reduced pressure caused by the aspirator and mixed with liquid passing through the flow passage, then the device structure is simple, but the amount of fine bubbles generated is insufficient
Solution Approach 1:
The flow passage is divided into multiple sections with different diameter characteristics: a reduced diameter portion (Venturi section) for pressure reduction and gas suction, and a normal diameter portion for stable liquid flow. This segmentation allows different functional zones within a single tubular body, enabling fine bubble generation without complex additional components.
Solution Approach 2:
The invention utilizes the Venturi effect (pneumatic principle) where liquid flowing through the reduced diameter portion creates a pressure difference that automatically sucks in gas. This pneumatic mechanism replaces complex mechanical mixing devices, achieving efficient gas-liquid mixing and fine bubble generation through fluid dynamics alone.
2Productivity
If the flow passage has uniform diameter, then the liquid flow is stable, but the gas-liquid mixing efficiency is low
Solution Approach 1:
The flow passage is designed with non-uniform diameter: the reduced diameter portion (Venturi section) has a smaller cross-section specifically at the location where gas suction is needed, while other portions maintain normal diameter for stable flow. This local variation in geometry creates the necessary pressure difference for efficient gas-liquid mixing without disrupting overall flow stability.
3Quantity of substance
If the bubble diameter is reduced to several tens of micrometers or less, then the dissolved gas concentration increases, but the device cannot generate a large amount of such fine bubbles
Solution Approach 1:
The Venturi effect creates a strong pressure difference between the reduced diameter portion and the gas introduction port, generating powerful suction that draws in large volumes of gas. The high-velocity liquid flow through the narrow Venturi section atomizes the gas into fine bubbles of several tens of micrometers or less, achieving both high dissolved gas concentration and large bubble quantity.
Solution Approach 2:
The turbulent flow and pressure fluctuations in the reduced diameter portion create mechanical disturbances that break up gas pockets into fine bubbles. The dynamic pressure changes and flow instability in the Venturi section serve to fragment gas into numerous small bubbles, increasing both the number and fineness of bubbles generated.
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 effectively generates a high concentration of fine bubbles with diameters of several tens of micrometers or less, maintaining suitable hydraulic pressure and achieving a high abundance ratio of nano-order level bubbles, enhancing applications in agriculture and beauty fields.
Implementation Method 1
a plurality of reduced diameter portions each having an inner diameter reduced are provided to the flow passage along a direction along which the liquid flows... there is a large pressure difference between a pressure at the reduced diameter portion and a gas pressurized to the atmospheric pressure or more hence, a large amount of gas is suctioned into the flow passage
Implementation Method 2
a gas supply unit including a compressor and a gas supply port, the compressor being configured to pressurize the gas, the gas pressurized by the compressor being supplied to the bubble generator through the gas supply port
Implementation Method 3
the flow velocity of gas introduced into the flow passage is increased, and the gas forcefully introduced into the flow passage from the through holes causes a strong swirling flow to be produced in the gas-liquid mixing portion
Data Source
AI summary
A bubble generating device is disclosed which includes: a bubble generator including a tubular body, a liquid introduction port, a gas introduction port, and a discharge port; and a gas supply unit including a gas supply port, a pressurized gas being supplied to the bubble generator through the gas supply port, wherein the flow passage of the bubble generator extends substantially along a same axis, a plurality of reduced diameter portions each having an inner diameter reduced are provided along a direction along which the liquid flows, and gas-liquid mixing portions are provided downstream of the respective reduced diameter portions in a contiguous manner, each of the gas-liquid mixing portions having an inner diameter larger than a minimum inner diameter of each of the plurality of reduced diameter portions, and the gas introduction port of the bubble generator is formed of a plurality of through holes.