Water passage circulation structure for condensing heat exchanger

The invention relates to a water passage circulation structure for a condensing heat exchanger. The water passage circulation structure comprises a shell, and a left cover plate and a right cover plate which are provided with cavities, wherein the left and right cover plates are arranged on the left and right side walls of the shell. The water passage circulation structure is characterized in that: the left cover plate is provided with a water inlet and a water outlet; the cavity of the left cover plate is divided into a plurality of independent left water circulating areas; one is communicated with the water inlet, and another independent left water circulating area is communicated with the water outlet; the cavity of the right cover plate is divided into a plurality of independent rightwater circulating areas; the plurality of left water circulating areas on the left cover plate and the plurality of right water circulating areas on the right cover plate are connected and matched through asymmetrical layer-staggered radiating straight pipes in the mode; and water spirally circulates in a W-shaped route among the left cover plate, the radiating straight pipes and the right cover plate and flows out of the water outlet on the left cover plate finally. The water passage circulation structure is novel; and the heat exchanger with the water passage circulation structure has a medium volume, longer service life, and higher thermal efficiency, and is energy-saving and durable.