Method, a bubble generating nozzle, and an apparatus for generating micro-nano bubbles
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Solution Overview
Problem
Conventional methods for generating micro-nano bubbles using pure water without nucleating agents are inefficient, and existing systems face challenges in producing a large amount of bubbles without metal contamination, which limits their application in semiconductor washing and food sterilization.
Innovation Solution
A method utilizing water hammering power to generate micro-nano bubbles through the optimized structure and shape of a bubble generating nozzle, combined with a compressed-air driven bellows-cylinder pump made of fluorine resin, to produce a large amount of bubbles without metal contamination.
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 jets (0.3-0.6 MPa discharge pressure) that collide to produce water hammering. This parameter change enables generation of sufficient micro-nano bubbles without nucleating agents, resolving the contradiction between ease of production and bubble quantity
Solution Approach 2:
The bellows-cylinder pump operates with periodic expansion and contraction cycles, creating intermittent high-pressure liquid jets that collide periodically. This periodic action generates continuous water hammering effects, maintaining high micro-nano bubble production without requiring chemical additives
2Productivity
If rotating type pumps are used to generate micro-nano bubbles, then bubble generation is possible, but metal contamination occurs from pump components
Solution Approach 1:
The invention replaces the rotating mechanical pump system with a bellows-cylinder pump that uses compressed air to drive periodic expansion and contraction. This substitution eliminates metal contamination from rotating components while maintaining bubble generation productivity through water hammering
Solution Approach 2:
The bellows-cylinder pump uses a flexible bellows element (made of fluorine resin or other non-metallic materials) to store and release compressed air, creating the pumping action without metal rotating parts. This flexible shell approach enables contamination-free operation while maintaining effective bubble generation
3Object-generated harmful factors
If all wetted parts of pumps are made of fluorine resin to avoid metal contamination, then clean washing is achieved, but application to generating micro-nano bubbles requires further development of plastic materials for nozzles and other components
Solution Approach 1:
The invention makes the bellows-cylinder pump system universally applicable to various clean washing and sterilization applications by extending the use of non-metallic materials (fluorine resin) to all wetted parts including nozzles, piping, and bubble generation components. This universal material application enables the system to be used in semiconductor manufacturing, food sterilization, and other sensitive applications
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 effectively generates a high volume of micro-nano bubbles using pure water, enhancing washing and sterilization efficiency and expanding application possibilities, including semiconductor manufacturing and food sterilization, while maintaining a clean and metal-free process.
Implementation Method 1
generating micro-nano bubbles by the mutual collision of the jets of the gas-including liquid... using water hammering
Data Source
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 the 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, including: 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 which 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.