Patent ID: 7726325

Claim:
An ultrasonic cleaning device comprising: an ultrasonic wave generator; a cleaning tank attached with said an ultrasonic wave generator for being filled with cleaning liquid for ultrasonic cleaning of an object to be cleaned by immersing the object to be cleaned in said cleaning tank and irradiating an ultrasonic wave from said ultrasonic wave generator; a cleaning-liquid circulation path formed so that the cleaning liquid in said cleaning tank is circulated through a predetermined path and returned into said cleaning tank; a circulating pump for suctioning the cleaning liquid in said cleaning-liquid circulation path for circulation; and a deaeration device disposed in said cleaning-liquid circulation path, wherein said deaeration device has an obstacle arranged in said cleaning-liquid circulation path to generate turbulence by resisting the flow of the cleaning liquid through said cleaning-liquid circulation path; and wherein dissolved air in the cleaning liquid flowing through said cleaning-liquid circulation path is bubbled by generating cavitation on a downstream side of said obstacle and the bubbled dissolved air flows back into said cleaning tank together with the cleaning liquid so that the bubbled dissolved air is ejected from a liquid surface of the cleaning liquid in said cleaning tank to an outside of said cleaning tank.