Micro-Nano Bubble Nozzle Using Water Hammering for Pure Water
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Solution Overview
Problem
Conventional methods for generating micro-nano bubbles are inefficient in producing a large amount using pure water without nucleating agents, and they often result in metal contamination, which limits their application in semiconductor washing and food sterilization.
Innovation Solution
A method and apparatus utilizing water hammering power, optimized nozzle structure, and a fluorine resin-based bellows-cylinder pump to generate micro-nano bubbles without nucleating agents, ensuring metal-free operation and increased bubble production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods (gas-liquid two-phase swirl flow, venturi tube, pressure dissolution) are used to generate micro-nano bubbles, then micro-bubble water can be easily produced, but the number of micro-nano bubbles generated is not large enough and requires addition of nucleating agents
Solution Approach 1:
The invention changes the physical parameters of the system by using a bellows-cylinder pump to generate high-pressure liquid flow (0.3-0.6 MPa discharge pressure) and controlling the gas-liquid mixing ratio. This parameter change enables the generation of a large number of micro-nano bubbles without nucleating agents, resolving the contradiction between ease of manufacture and bubble quantity
Solution Approach 2:
The invention employs pneumatic and hydraulic principles through the bellows-cylinder pump system that uses compressed air to drive the bellows, creating high-pressure liquid flow. The gas-liquid mixing chamber utilizes hydraulic pressure differential to achieve efficient mixing and bubble generation, thereby increasing the number of micro-nano bubbles without requiring nucleating agents
2Ease of operation
If rotating type pumps are used to generate micro-nano bubbles, then liquid can be fed, but metal contamination occurs from wetted parts
Solution Approach 1:
The invention replaces the conventional rotating mechanical pump system with a bellows-cylinder pump that uses compressed air to drive reciprocating motion. This substitution eliminates metal-to-metal contact in the wetted parts, preventing metal ion contamination while maintaining liquid feeding capability. The bellows cylinder and piston move reciprocally without rotating components in contact with the liquid
Solution Approach 2:
The invention uses a bellows cylinder made of flexible material that expands and contracts to drive the reciprocating pump mechanism. The flexible bellows shell replaces rigid rotating components, allowing the pump to feed liquid without metal contamination. All wetted parts including the bellows cylinder, piston, and valves are made from non-metallic materials
3Object-generated harmful factors
If all wetted parts are made of fluorine resin to avoid metal contamination, then clean washing is achieved, but the apparatus structure becomes more complex
Solution Approach 1:
The bellows-cylinder pump design integrates multiple functions into a single apparatus: it provides metal-free liquid feeding, generates high-pressure flow for bubble creation, and maintains clean operation throughout. By making all wetted parts fluorine resin, the same structural components serve both the pumping function and the contamination prevention requirement, reducing the need for separate protective measures
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 method achieves stable and efficient generation of a large amount of micro-nano bubbles using pure water, reducing metal contamination and expanding application to semiconductor washing and food sterilization, while minimizing environmental impact.
Implementation Method 1
a liquid jet is issued from a small through-hole to collide, thereby generating a water hammering power
Data Source
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AI summary
A new method for generating micro-nano bubbles that uses water hammering, a bubble generating nozzle, and an apparatus for generating micro-nano bubbles are provided to construct a system. The system is for generating micro-nano bubbles in a large amount using only pure water, which does not include any nucleating agents, and for performing not only a clean washing and sterilization but also generation of uncontaminated micro-nano bubbles. The method defined in the present invention uses water hammering power produced by a mutual collision of jets of dissolved-gas-including solution squirted from two or more spouts. The bubble generating nozzle by the present invention has a configuration, comprising: a hollow cylinder having two or more small through-holes arrayed in the circumferential direction thereof and a micro-nano bubble discharge port provided on the both ends of the hollow cylinder, wherein the small through-holes are arranged so that all of their extension lines passing through respective center of the cross-section of each of the small through-holes intersect each other in the inside of the hollow of the cylinder. The apparatus for generating bubble by the present invention has such bubble generating nozzle and has a configuration that enables generation of micro-nano bubbles in a large amount.