Ultrasonic Horn Design for Large Output Surface and Low Stress
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Solution Overview
Problem
Converging ultrasonic horns used in industrial liquid processing are limited by their small output surface areas and high-amplitude tip diameters, restricting them to laboratory-scale processing, and existing full-wave and half-wave horn designs require specific section configurations that increase stress and complicate manufacturing, limiting adaptability and longevity.
Innovation Solution
Novel ultrasonic horn designs without the constraints of specific section numbers, lengths, or profiles, allowing for flexible shapes and reduced stress, enabling increased acoustic energy transfer and uniformity, and extending the horns' operational lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If converging horn design is used to increase vibration amplitude, then gain factor is improved, but output surface area becomes too small for industrial-scale processing
Solution Approach 1:
The ultrasonic horn is divided into multiple sections with different functions: a first section for amplitude amplification, a second section for maintaining large surface area, and a third section for additional amplification. This segmentation allows each section to optimize for its specific function rather than compromising overall performance.
Solution Approach 2:
The patent transitions from traditional single-dimension convergence to multi-dimensional design by adding axial length as a critical dimension. The extended axial length of the second section provides the necessary surface area while the first and third sections provide amplitude amplification in the radial dimension.
2Power
If full-wave or half-wave horn designs are used to provide high output vibration amplitudes and large output surface areas, then processing capacity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Each section of the ultrasonic horn is designed with specific local characteristics optimized for its function. The first section has a profile optimized for amplitude amplification, the second section maintains a larger cross-section for surface area, and the third section provides additional amplification. This local optimization reduces overall complexity compared to uniform designs.
3Power
If multiple cylindrical sections and variable-diameter sections are interconnected to achieve high output, then vibration amplitude is improved, but material stress increases and operational life decreases
Solution Approach 1:
The horn design incorporates gradual transitions and stress-distributing geometries in advance to prevent stress concentration. The variable-diameter sections are designed with optimized profiles that gradually change the cross-section, preventing sudden stress spikes that would occur with abrupt transitions.
4Duration of action of stationary object
If specific section lengths and profiles are required to decrease dynamical stress, then operational life is improved, but adaptability to different processes is reduced
Solution Approach 1:
The patent employs adjustable and configurable section parameters that can be optimized for different applications. The variable-diameter sections can be designed with different profiles and lengths depending on the specific process requirements, allowing the same basic horn structure to adapt to various ultrasonic processing needs while maintaining stress management.
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
These designs enhance the capacity and efficiency of acoustic energy distribution, improve the adaptability of ultrasonic horns to specific processes, and extend their longevity by simplifying manufacturing and reducing material stress, enabling industrial-scale processing.
Implementation Method 1
Advantages of using ultrasonically induced acoustic cavitation for liquid processing are well-known
Implementation Method 2
the liquid is in contact with an ultrasonic horn (also known as probe, waveguide radiator and sonotrode), which is connected to an electro-acoustical transducer and used to amplify the transducer's vibration amplitude and deliver the ultrasonic energy to the liquid
Data Source
AI summary
Ultrasonic horns having improved longevity and simplified manufacturing approaches that can be more easily adapted to ultrasonic reactor chambers or batch processing containers. The ultrasonic horn designs increase the uniformity and intensity of acoustic energy radiated into a liquid medium and thus better correspond to the requirements of a particular sonochemical or sonomechanical process. The ultrasonic horns do not require a specific number of cylindrical sections and allow for various lengths and profiles of variable-diameter sections. The ultrasonic horns also reduce stress in the material of the ultrasonic horns and therefore extend longevity.