This creation is that a kind of frequency conversion type vacuum inhales saliva machine,It includes casing,Frequency Drive Control mould group,Ptysma-absorbing tube and filter,In the what casing of Frequency Drive Control mould group position,And include vacuum pump and frequency-changing control system,Vacuum pump drives equipped with inverter motor,And its running power system is controlled by frequency-changing control system,In the filter position what casing and connect the vacuum pump； In order to which the suction for solving existing vacuum suction saliva machine is unstable,And patient can be made to feel more uncomfortable when receiving dental diagnostic,The vacuum pump system of this creation can provide steadily suction with frequency-changing control system control,To solve the problems, such as that patient can not feel good because vacuum suction saliva machine suction is unstable.本創作為一種變頻式真空吸唾機，其包含機殼、變頻驅動控制模組、吸唾管及過濾器，變頻驅動控制模組位於機殼內，且包含真空泵及變頻控制系統，真空泵設有變頻馬達來驅動，且其運轉功率係受變頻控制系統控制，過濾器位於該機殼內且連接該真空泵；為了解決現有的真空吸唾機的吸力不穩定，而會使患者在接受牙科診療時倍感不適，本創作的真空泵係以變頻控制系統控制而能提供穩定地吸力，以解決患者會因真空吸唾機吸力不穩定而感到不適的問題。
