Definition
A laboratory ultrasonic cleaner is a device that uses ultrasonic energy to create a physical cleaning effect in a liquid medium. It is usually composed of an ultrasonic generator, transducer and cleaning tank, which is suitable for removing adhesions on the surface or pores of the sample, and is widely used in the pretreatment and maintenance of materials, electronics, optics and other fields.
How it works:
Ultrasonic cleaning is based on the cavitation effect. The ultrasonic generator generates a high-frequency electrical signal that drives the transducer to convert the electrical energy into mechanical vibrations and propagates it in the cleaning solution. When the sound wave pressure changes, tiny bubbles form in the liquid and burst rapidly, creating local high pressure and shock waves that strip away contaminants from the surface of the object to be cleaned. Its intensity can be preliminarily described by the sound intensity formula: I = P²/(2ρc), where I is the sound intensity, P is the sound pressure, ρ is the medium density, and c is the speed of sound.
Measurement and evaluation methods
Cleaning effectiveness is usually evaluated according to relevant industry standards by comparing the surface condition of the sample before and after cleaning. Common methods include gravimetric (measuring the quality of contaminant removal), microscopic observation (checking for surface residue), and contact angle measurement (evaluating changes in surface wettability). The detection of operating parameters involves the monitoring of ultrasonic frequency, power density and cleaning fluid temperature, which can be obtained through calibrated frequency meters, power meters and temperature sensors.
Influencing factors
The cleaning effect is affected by multiple parameters. Ultrasonic frequency affects the size and distribution of cavitation bubbles, low frequency is suitable for larger particulate pollutants, and high frequency is conducive to penetration of fine structures. The chemistry, viscosity and surface tension of the cleaning solution will change the cavitation threshold and wetting ability. Elevated temperatures usually increase cleaning fluid activity, but avoid bubble shielding near the boiling point. In addition, the placement of samples in the cleaning tank is directly related to the uniformity of the sound field.
Scope of application:
The device has a wide range of uses in industrial and scientific research scenarios. In materials science, it is used to remove debris from metal parts after machining; In the electronics industry, flux residue can be removed from circuit boards; It is often used in the field of optics for the coating pretreatment of lenses and prisms; It also plays an important role in the maintenance of auto parts, jewelry and precision machinery. Its non-contact cleaning properties are particularly suitable for items with complex shapes or fragile surfaces.
Selection reference
When choosing equipment, the cleaning object and process requirements should be comprehensively considered. The capacity needs to match the size and batch of the item to be cleaned. The frequency range should be determined based on the type of contaminant, with common equipment frequencies ranging from 20 kHz to 80 kHz. In terms of material, the cleaning tank is usually made of stainless steel, and its corrosion resistance needs to be noted. The adjustable power range and heating function enhance process adaptability. In addition, safety features such as over-temperature protection, ground integrity, and compliance with relevant electrical standards are also necessary considerations.