Knowledge | 2022-10-22
Ultrasonic cleaning of the rotor pump body
The cleanliness of the pump body of the high-pressure common rail pump is an important index in quality inspection, which has an important influence on the movement, wear, and blowhole jam of the parts after the pump assembly. The clearance of the piston in the pump assembly is 1 ~ 1.5 mm, and the small particle impurities enter the clearance with the liquid, which leads to the early wear of the plunger and other precision couplings and affects the service life of the pump assembly, if the impurities into the camshaft and tappet with the clearance, will lead to early wear, stuck, or even no fuel injection.
Ultrasonic cleaning principle
The ultrasonic wave has the characteristics of a high cleaning degree and fast cleaning speed. It has the unique advantage that the general cleaning process can not guarantee the cleanliness control of many parts such as the deep hole, blind hole, and micro-cross hole. Therefore, the study of ultrasonic cleaning technology is of great significance to improve the cleanliness of the pump body. Ultrasonic cleaning is to use the“Cavitation effect” of ultrasound to peel off the dirt and cleaning agent to dissolve the dirt, that is, under the“Cavitation effect” of ultrasound on the surface of the workpiece, after peeling off from the surface of the workpiece, the sloughed dirt is dissolved by the cleaning medium using the principle of“Similar compatibility”.
The ultrasonic cleaning method is as follows. The vibration signal generated by the Ultrasonic transducer is converted by the ultrasonic power through the electrical signal. The vibration signal generated by the ultrasonic power is transmitted to the cleaning fluid through the groove wall. After the parts in the cleaning fluid receive the ultrasonic vibration, the dirt on the inside and outside surfaces of the parts is quickly removed.
The law of influencing factors of ultrasonic cleaning effect
The cavitation and cleaning fluid are the main factors that affect the effect of ultrasonic cleaning, and the frequency and power density of ultrasonic waves are the main factors that affect the cavitation, the main factors affecting the cleaning effect of cleaning agents are temperature, surface tension, steam pressure, viscosity and flow velocity, the effect of ultrasonic cleaning is also affected by operating time, vacuum degree and the position of parts in the sound field
High-pressure common rail pump body cleanliness is not ideal, easy to cause movement parts stuck, wear and affect the pump assembly life. Ultrasonic cleaning technology has unique advantages in ensuring the cleanliness of complex cavity parts.