Ultrasonic energy-gathering crushing method and device

Abstract

The invention relates to the technical field of micronization processing, in particular to an ultrasonic energy-gathering crushing method and device. The device comprises an ultrasonic transducer (1),a coupling liquid cavity (2), an energy-gathering crushing cavity (3), a diaphragm (4) and a diaphragm groove (7). According to the device, the ultrasonic transducer with a concave spherical transduction surface is utilized for producing energy focusing, the cylindrical crushing cavity is utilized for guiding, recovering, reflecting and gathering secondary energy, and a feed liquid carrying particles is controlled to flow through various levels of energy enriching areas. According to the ultrasonic energy-gathering crushing method provided by the invention, energy gathering is favorable for improving the energy density and provides high-magnitude energy supply for crushing. According to the method, the energy magnitude and the energy utilization efficiency can be improved, and the controllability of a particle micronization process and the consistency of product particle size are improved.

Description

technical field [0001] The invention relates to the technical field of miniaturization processing, in particular to an ultrasonic energy-gathering crushing method and device. Background technique [0002] Ultrasonic crushing is the process of crushing solid particles or biological tissues in a liquid medium by using an ultrasonic field in a liquid medium. When the ultrasonic waves propagate in the liquid, a relatively stable sound pressure field with alternating positive and negative changes will be formed, and a certain area of ​​the liquid medium will form a local transient negative pressure area. On the one hand, the alternating positive and negative sound pressure fields can alternately exert pressure on the particles in the area, and when the frequency of the pressure is consistent with the resonance frequency of the particles, it can cause the particles to enter the resonance state and collapse; Negative alternating pressure can also produce fatigue stress and cause p...

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Problems solved by technology

[0006] The use of ultrasonic energy does not consider the coupling effect of the sound source and the sound field of the material liquid cavity, and the energy utilization form is extensive and the efficiency is low; the ultrasonic radiation form of the submerged horn structure is single, and the energy is concentrated near the end, showing an inverted cone shape weakened, it is difficult to gather and utilize in a targeted manner; energy dissipation and heat generation are more serious; the cavitation collapse point is concentrated near the end of the horn, and the distribution has a significant local regionality, and the crushing uniformity is poor, resulting in a particle size after treatment. The distribution range of ultrasonic crushing is relatively wide; the impact crushing energy has not fully realized energy concentration and targeted positioning application; the flow of material liquid, energy distribution and guidance in the process of ultrasonic crushing lack active and effective control

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