Patent ID: 7771543

Claim:
A dishwasher, comprising: a tub for accommodating dishes for washing; a sump housing receiving water for dishwashing, the sump housing coupled to the bottom of the tub; a wash motor mounted to the outer bottom surface of the sump housing and having a motor shaft extended into the sump housing by passing through the bottom surface of the sump housing from the wash motor; a wash pump located within the sump housing, the wash pump including: a pump case; and an impeller for pumping the water for dishwashing within the pump case, wherein the impeller is connected to an end of the motor shaft; a sealing case upwardly extended from an inner bottom surface of the sump housing; a sealing cover fitted within the sealing case and penetrated by the motor shaft; and an air cap covering the sealing case and the sealing cover and penetrated by the motor shaft, wherein the air cap has a space therein for accommodating air, in order to prevent the water for dishwashing from being drawn into the sealing case, and the air cap includes: an upper plate; a motor shaft through-sleeve extending upward by a predetermined diameter and height from the upper plate, the motor shaft through surrounding the motor shaft to be in close contact with the outer surface of the motor shaft; an outer wall extending downward from an edge of the upper plate; and an inner wall extending down ward from the bottom surface of the upper plate, wherein the inner wall is defined within the outer wall by being a predetermined distance away from the outer wall such that a void space is formed between the inner wall and the outer wall.