Dental suction machine and vacuum pump are necessary equipment for clinic. Intelligent frequency conversion adopt sensor to test the vacuum degree in the pipeline, regulate power of pump according to use condition of dental unit, save more electric energy, extend pump's use-life time. Reliable intelligent control technique ensure each pump to control separately, test the moving condition of each pump, let pump working exchange, extend pump's use-life time.It is with colorful touch screen, show working state. These are the following advantages and features. The first one is efficient separation, compact structure, Low use-cost. Let air and liquid separate in the small room. Separation system and vacuum pump is connected in the same central driving shaft, don't need install separation system in the dental unit and don't need any other traditional system's working cost--- as water pump. The second is strong power. Adopt width voltage and double frequency motor with protection leave IP55 (insulation grade F) as drive, accomplish turbine circulation suction power, lower noise, higher pressure, larger flowing. Offer the constant suction power for treatment. The third is regulation and cooling. Built-in air valve, not only regulate suction power of system, but also ensure inside cooling of pump. The fourth is corrosion resistance.  Separation system adopts high grade engineering plastics, corrosion resistance and long use-life time. The last one is two stage separation systems. Innovative two stage separation system has higher foam tolerance, ensure out- air without any water and avoid pump damage.