Air intake supressor

A device to limit the amount of air intake into a submersible mixer being mounted on a frame for operating beneath a liquid surface, the mixer including a motor, a propeller mounted on the shaft of said motor, and a shroud surrounding said propeller, the device comprising:

• a cover being mounted on the frame above the mixer, said cover extending forward of the propeller 0.5 to 0.7 times the propeller diameter, and rearward of the propeller about twice the propeller diameter;
• said cover having a width of about twice the diameter of said propeller, and a length 2 to 3 times the diameter of said propeller;
• and
• said cover being mounted at an angle of 5 to 15 degrees and preferably 8 to 12 degrees, with respect to the axis of the propeller, such that the forward extending end of said cover is closer to the propeller axis than the rearward end of said cover.