Patent ID: 8364029

Claim:
A steam generator, comprising: a body, said body comprising a flow passage, said flow passage having an inlet and an outlet; a heater installed in said body and adapted for heating water guided through the inlet of said flow passage into the inside of said flow passage into steam for enabling the steam to flow out of the outlet of said flow passage; and at least one friction unit mounted in said flow passage and movable by the steam to rub against the inside wall of said flow passage and to remove water scale from said inside wall, wherein each said friction unit comprises: an elastic member having a pressure-receiving end and a pressure-releasing end; and a first friction member mounted on the pressure-receiving end of said elastic member and movable along said flow passage and adapted for rubbing against the inside wall of said flow passage when moving along said flow passage, said first friction member being movable by the steam in direction toward said pressure-releasing end.