Several common liquid level controls in vacuum oil filters

The commonly used liquid-level control methods in vacuum oil purifiers are mainly the following:

1. Float-type liquid level control

Float-type liquid level control is a common liquid level control method. Its principle is to sense the height of the liquid level through the change in the buoyancy of the float in the oil. When the oil rises, the float rises accordingly; when the oil falls, the float falls accordingly. The float is connected to the controller through a connecting rod or a transmission mechanism. When the float reaches the preset liquid level, it will trigger the controller to perform corresponding operations, such as closing the oil inlet valve or starting the oil pump. However, traditional float control can generally only detect the height of the liquid level, and cannot directly control the start and stop settings of the oil pump through the solenoid valve. It is not sensitive and the error is relatively large.

2. Tank external float induction liquid level control

Tank external float induction liquid level control is another common liquid level control method. Unlike float-type liquid level control, tank external float induction liquid level control senses liquid level changes by installing a float on the outside of the oil storage tank. The float is connected to the sensor through a connecting rod or cable. When the liquid level rises or falls, the float will drive the connecting rod or cable to move, thereby triggering the sensor to perform corresponding operations. Compared with the float-type liquid level control, this method is more convenient to install and maintain and is not affected by the internal environment of the oil tank.

3. Infrared liquid level control

Infrared liquid level control is a more advanced liquid level control method in vacuum oil purifiers. Its principle is to use infrared sensors to emit infrared beams and receive reflected infrared signals to sense the height of the liquid level. When the oil rises or falls, it will change the reflection path of the infrared beam, thereby triggering the sensor to perform corresponding operations. Infrared liquid level control has the advantages of high sensitivity, small error, and rapid response, which can effectively prevent the occurrence of idling or oil injection events of the oil pump. At the same time, infrared liquid level control is also suitable for liquid level detection and inlet and outlet oil signal control of transparent, translucent, and low-viscosity oils.

Summary

In summary, the commonly used liquid level control methods in vacuum oil purifiers include float-type liquid level control, tank float induction liquid level control and infrared liquid level control. Although float-type liquid level control is simple and intuitive, its sensitivity and accuracy are relatively low; tank float induction liquid level control is easy to install and maintain, but it may produce errors when affected by the external environment; infrared liquid level control has the advantages of high sensitivity, small error and wide application range, and is a more ideal liquid level control method in modern vacuum oil purifiers. In practical applications, the appropriate liquid-level control method should be selected according to the specific needs of the equipment and the working environment.