Pressure sending blower is a kind of volumetric blower, its pressure can be adjusted within the permissible range according to the user's requirements, there are two sets of impellers set up inside the casing to rotate in the opposite direction to each other, in the state of rotating between the impellers and impellers and impellers and the casing, leaving only a small gap between the state of rotating. When the impeller passes through the suction end, a certain amount of air is captured between the impeller and the casing, and with the impeller rotating, the air is shifted side by side, and the pressure is gradually increased and then sent to the outlet end.