SK ultrasonic cleaner

ultrasonic cleaner Technology

【The principle of ultrasonic cleaning)】

Ultrasonic cleaning principle: Ultrasonic cleaner by the ultrasonic generator will be higher than 20KHz frequency oscillation signal electric power is amplified by the ultrasonic transducer (Seismic header) is converted into a high-frequency mechanical vibration energy to the inverse piezoelectric effect by the cleaning medium acoustic radiation, the cleaning fluid molecules vibrate and produce numerous tiny bubbles. Bubbles along the acoustic propagation in the negative pressure zone formation, growth, and rapidly closed in the positive zone and thousands of atmospheres of high-voltage transient blasting, the formation of the countless microscopic high-pressure shock wave cleaning the workpiece surface. Namely ultrasonic cleaning cavitation. " Ultrasonic cleaning machine is based on the basic principles of the cavitation work As a result, ultrasonic cleaning workpieces with complex internal and external structure, micro uneven surface, slits, holes, corners, dead ends, component-intensive with excellent The cleaning ability is unmatched by other cleaning methods. The reduced impact force, with the ultrasound frequency increases, the increase in the number of bubbles and blasting equipment, high-frequency ultrasound, particularly applicable to the cleaning of the small particles of dirt without breaking the ring workpiece surface.

【Ultrasonic transducer and generator】

The ultrasonic cleaning system is the most important part of the transducer. Existing two transducer is a magnetic transducer, made of nickel or a nickel alloy; a piezoelectric transducer is made from lead zirconate titanate or other ceramic. When the electric field in the piezoelectric material into voltage changes, it will deform, which is so-called 'piezoelectric effect'. Relatively speaking, a magnetic transducer is made of a deformable material that will occur in a changing magnetic field. Regardless of the transducer, its generated cavitation intensity is usually the most basic factor. Ultrasound and other sonic, is a series of pressure points, i.e., a compression and expansion of alternating waves. If the acoustic energy is strong enough, the liquid in the expansion phase of the wave is open, thereby generating the bubble; while in the compression phase of the wave, these bubbles in the liquid instantly burst or burst, resulting in a very effective impact force, particularly for cleaning. This process is said to be short of a role.

【Ultrasonic cleaning superiority】

High precision: the ultrasonic energy is able to penetrate tiny cracks and holes, it can be applied to clean any parts or assemblies. Be cleaned pieces of precision components or assemblies, ultrasonic cleaning often become the only cleaning method to meet their specific technical requirements; Fast relative to conventional cleaning methods: ultrasonic cleaning in the dust of the workpiece descaling much faster. Assemblies without dismantling can be cleaned. Ultrasonic cleaning can be labor-saving advantages often making it the most economical cleaning method; The consistency: cleaning parts is large or small, simple or complex, single piece or bulk or on the auto assembly line, the use of ultrasonic cleaning manual cleaning unparalleled uniformity Cleanliness.

【Ultrasonic compression and expansion】

From the theoretical analysis, the cavitation bubble will generate a burst pressure of more than 10,000 psi and 20,000 ° F (11,000 ° C), high temperature, and quickly radiate in its burst at the moment when the shock wave. The energy released by a single cavitation bubble is very small, but hundreds of millions of cavitation bubbles per second burst, the cumulative effect will be very strong, the powerful impact of the workpiece surface dirt falling off This is all the ultrasonic cleaning features. Ultrasonic energy is large enough, the cavitation everywhere in the cleaning solution so effective ultrasonic cleaning tiny cracks and holes. The cavitation also contributed to the chemical reaction and accelerated the dissolution of the surface film. However, only in a region of the pressure of the liquid is lower than the gas pressure within the bubble will be generated in the region of cavitation, and therefore the amplitude of the ultrasonic waves generated by the transducer is sufficiently large in order to satisfy this condition. The minimum power required to produce cavitation is said to be short of the critical point. The type of the presence of a liquid type of cavitation critical point, the ultrasonic energy must exceed the critical points in order to achieve the cleaning effect. That is, only the energy exceeds the critical point in order to produce cavitation bubbles for ultrasonic cleaning.

【The importance of the ultrasonic frequency】

When the operating frequency is very low (in the range of human hearing) will produce noise. Frequencies below 20kHz noise becomes large, and may exceed the Occupational Safety and Health Act or other regulations required safety noise limits. Usually selected within the range from 20kHz to 30kHz lower cleaning frequency of the cleaning frequency within the frequency range are often used for cleaning large, heavy parts or high density materials in the high power is required in the application without regard to the damage of the workpiece surface to remove dirt, workpiece. High frequency is usually used for cleaning smaller than the precision of parts, or removal of tiny particles. High frequency is also used in the application is not allowed to damage the surface of the workpiece. Using high frequency in several ways to improve the cleaning performance. As the frequency increases, the number of cavitation bubbles increases linearly, resulting in a more intensive shock waves so that it can enter into a smaller gap. If power is kept constant, the cavitation bubble becomes small, a corresponding reduction of the energy released, and this effectively reduces the damage to the workpiece surface. Another advantage of the high frequency is to reduce the viscous boundary layer (parking Nuri effect), ultrasonic able to 'find' very small particles.

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