Why the shock head will be damaged if water is not added to the inner groove?

We use in the process of ultrasonic cleaning machine, is often found that the afraid we don't open the heating function, but the ultrasonic cleaning machine work for a long time, will also lead to cleaning tank cleaning medium temperature in slowly heat up, usually work continuously more than 2 hours, the water temperature can reach 30 to 40 degrees or so, if the water in the cleaning tank is less, the temperature is even higher, so, What causes it?

This will be explained from the working principle of ultrasonic cleaning machine. Ultrasonic cleaning machine is the head of the high frequency vibration to generate ultrasonic, ultrasonic wave through the slot of amplification, role in the cleaning tank cleaning medium (cleaning medium, can be water or other liquids, such as using like alcohol, wash water, such as inflammable, explosive liquid need to pay special attention to, when to put commonly in more than half of the trough, and in the place where the air circulation, If you can, it is best not to use, because there will be safety risks) the shock head in a second nearly 40,000 times of high frequency vibration will generate a lot of heat, if there is no cleaning medium to help cool down, the shock head will be because a lot of heat can not be released, and lead to the shock head is burned out. This is why the ultrasonic cleaning machine must be placed in the inner groove of the cleaning medium.