YWW water-cooled blower is a kind of volumetric blower, the pressure of which can be adjusted within the permissible range according to the user's requirements. Two kinds of impellers are set up inside the casing to rotate in the opposite direction to each other, and rotate in the state of there is only a very small gap between the impeller and the impeller and the impeller and the casing. When the impeller passes through the suction end, a certain amount of air is captured between the impeller and the casing, and with the rotation of the impeller, the air is shifted side by side, and the pressure is gradually increased and then sent to the outlet end.