Ultrasonic transducers: The most important part of an ultrasonic cleaner is the transducer. There are two types of transducers, one is a magnetic transducer made of nickel or a nickel alloy, and the other is a piezoelectric transducer made of lead zirconate titanate or other ceramics. When a piezoelectric material is placed in an electric field of varying voltage, it deforms. This is called the 'piezoelectric effect'. Relatively speaking, magnetic transducers are made of materials that deform in a changing magnetic field.
A cleaning machine uses a plurality of transducers, which are bonded to the bottom of the cleaning cylinder via an adhesive and connected in parallel to form a transducer of a cleaning machine. The distance between the transducer elements (usually 5-10mm for the frequency 20kH4 is too large, it is easy to produce bending vibration, and the vibration plate is corroded, and the radiation surface is relatively reduced.
What should I do if there is a problem with the ultrasonic cleaner transducer?
1. The ultrasonic transducer is damp. Generally, the megohmmeter is used to check the plug connected to the transducer, and the insulation resistance between the positive and negative poles of the transducer can be checked. Insulation resistance is generally required to be greater than 30 megohms. If this insulation resistance value is not reached, it is likely that the transducer is wet. The maintenance method is to put the whole transducer (excluding the sprayed plastic case) into the oven setting to about 100 °C, dry for three hours or use a hair dryer to remove moisture until the resistance is normal. The transducer vibrator is fired and the ceramic material is broken. The inspection can be combined with the naked eye and the megohmmeter during maintenance. Generally, as an emergency treatment measure, individual damaged transducers can be disconnected without affecting the normal use of other transducers.
2. The transducer vibrator is fired and the ceramic material is broken. It can be combined with the naked eye and the megohmmeter. Generally, as an emergency treatment measure, the individual damaged vibrators can be disconnected without affecting the normal use of other vibrators.
3. The vibrator is degummed. Generally, the output power of the ultrasonic power supply is normal after the demagnetization occurs, but since the vibrator is not well connected to the vibrating surface, the vibration effect of the vibrating surface is not good, and the vibrator may be burned out due to the inability to release the energy after a long time. The degumming of the vibrator is troublesome for the user to repair, and the general situation can only be sent back to the manufacturer for maintenance. The most effective way to avoid degumming of the vibrator is to pay attention to not hit the vibrating surface during normal use.
4. Stainless steel vibrating surface perforation. Generally, the ultrasonic transducer can be perforated on the vibrating surface after being used for 10 years at full load. This is due to the high-frequency vibration fatigue of the stainless steel plate on the vibrating surface for a long time. The perforation of the vibrating surface indicates that the service life of the transducer has arrived. Generally only replaceable.
High Flow Nasal Cannula
High flow oxygen therapy (HFNC) is a kind of oxygen therapy that directly transports a certain oxygen concentration of air oxygen mixed with high flow gas to patients through a soft nasal cannula. Also known as transnasal high flow oxygen therapy, high flow humidification oxygen therapy. HFNC has unique physiological effects: Constant oxygen concentration, Good effect of temperature and humidity, To flush the dead space of the nasopharynx, Give some positive airway pressure, Good comfort.
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