HEAT EXCHANGER AND CLEANING DEVICE WITH THE SAME

摘要

A heat exchanger is constituted of a substantially circular cylindrical sheathed heater, a substantially circular cylindrical case, and a spiral spring. The sheathed heater is received in the case, and the spring is wound on the outer peripheral surface of the sheathed heater. Thus, a spiral flow path is formed in a space surrounded by the outer peripheral surface, inner peripheral surface of the case, and spring. The spring functions as a flow speed changing mechanism, turbulence producing mechanism, flow direction changing mechanism, and impurity removing mechanism. A water inlet and a water outlet are arranged on a side surface of the case, at positions eccentric from the center axis of the case.