Arrangement and power density of ultrasonic transducer used in the ultrasonic cleaner

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Ultrasonic transducer vibration cleaning (generally referred to as vibrators or vibrators in the cleaning industry) currently have ultrasonic cleaning machines in the cleaning tank. The transducers stuck to the bottom or wall of the cleaning tank are too densely , one next to the other. The input transducer has a power intensity of 2-3 watts per square centimeter. This high strength accelerates the cavitation corrosion of the surface of the stainless steel plate (the surface in contact with the cleaning fluid) and shortens the service life. A large number of large bubbles are generated near the surface of the steel sheet, which increases the sound propagation loss and weakens the cleaning action away from the transducer. Generally, the power intensity is preferably 0.75 watts per square centimeter (calculated according to the area of the steel plate to which the transducer is attached). If the cleaning tank is deep, in addition to the transducer at the bottom of the tank, the bonded transducer should also be considered on the wall of the tank, or only on both sides of the tank.

The bonding quality of the transducer and the cleaning tank has a great influence on the quality of the ultrasonic cleaning machine. Not only should it be adhered, but also the glue layer should be uniform, no glue and no cracks allowed, so that the ultrasonic energy can be transmitted to the cleaning liquid to the maximum to improve the efficiency and cleaning effect of the whole machine. Some cleaning equipment is currently used to prevent the transducer from falling off the cleaning tank. The fixing method of the screw and the glue is adopted, and the connection method can well prevent the transducer from falling down. However, which pay attention to the quality of screw welding. If it is not perpendicular to the surface of the stainless steel plate, the rubber layer will be uneven, even if there is crack or lack of glue, the energy transmission will be weakened; If the welding is not good, it will affect the smoothness of the stainless steel surface,which is leading to accelerated cavitation corrosion and shortening the service life, so the welding quality is very important. When bonding, the bonding surface needs to increase the surface roughness. Generally, sandblasting is used. Most domestic manufacturers do not have this process.

One of the methods for judging the quality of the bond is to measure the temperature rise of the transducer after the tank is filled with water and turned on for a period of time. If the temperature has the rising of a transducer in a large number of transducers is particularly fast, it indicates that the transducer may not bond well. Because the sound radiation is not good at this time, most of the electric energy is consumed on the transducer and generates heat. Another method is to measure the impedance of the transducer one by one under small signal conditions to determine the bond quality.