Spiral circulating dryer

The invention relates to a spiral circulating dryer which comprises a shell, an inner container is welded in the shell, a water inlet and a water outlet are connected to the middle space of the inner container, an upper flange is welded to the upper end of the shell, a lower flange is welded to the lower end of the shell, and a spiral groove is formed in the inner container. The inner container of the dryer is spiral and has no dead angles, hot water circulates fully in the spiral groove body, the flow speed is increased, the heat production benefit is increased, and the heat benefit is increased by 30% compared with that of an old-fashioned dryer. 本发明涉及一种螺旋式循环烘干器，包括外壳，外壳内焊接有内胆，内胆向中间空间处连接有进水口和出水口，外壳的上端焊接有上法兰、外壳的下端焊接有下法兰，内胆上设有一呈螺旋型的槽体。本烘干器的内胆采用螺旋式，内胆无死角，热水在螺旋的槽体内充分循环，流量增速增大，增加了产热效益，比老式烘干器增加热效益达到30％。