LIQUID HEATING DEVICE

PURPOSE: A liquid heating apparatus is provided to run a liquid into a case with a blade, to raise the temperature of the liquid with cavitation with passing the liquid through a space in which a cross section inside the case quickly varies, and to discharge the liquid through an outlet. CONSTITUTION: A liquid heating apparatus includes a cylindrical and hollow case (10), a disc-shaped rotating body (20), and a cover part (30). A rotary shaft (S) protrudes inside the case. One side of the case is opened, and the other side of the case has multiple circular grooves (11) at equal distances. The grooves are concentric to the rotary shaft. The rotating body is coupled to the rotary shaft. The rotating body has a surface facing an internal surface at the other side of the case, and multiple first radial grooves are formed at the surface. The rotating body has the opposite surface of the surface facing the internal surface at the other side of the case, and a blade part (B) having multiple blades (22) is formed at the center of the opposite surface. The cover part closes the opened one side of the case, and a first inlet and an outlet are formed at an inner side thereof. Multiple second radial grooves (25) are formed at the opposite surface of the surface facing the internal surface at the other side of the case.