Self-evacuating vacuum cleaner

A vacuum cleaner comprising:

• a tank for collecting vacuumed material, the tank defining an inlet through which the vacuumed material passes;
• a source of mechanical force for driving a first and a second shaft, wherein the first shaft is essentially collinear with the second shaft;
• an air impeller housing defining an opening in communication with the tank;
• an air impeller disposed in the air impeller housing, secured to the first shaft and driven by the source of mechanical force for creating a low pressure area in the tank to draw material into the tank;
• a pump located in the tank, the pump having a pump impeller which is secured to the second shaft and driven by the source of mechanical force;
• an inlet to the pump disposed within the tank and located near a lower portion of the tank;
• and
• an outlet to the pump exterior to the tank;
• wherein liquid material in the tank is drawn into the pump inlet by the pump impeller and expelled through the pump outlet.