Heat exchanger with spiral tube banks

The utility model relates to a heat exchanger, in particular to a heat exchanger with spiral tube banks. The heat exchanger comprises a closed cylinder body, seal heads are connected to the upper end and the lower end of the cylinder body respectively, and a vertical middle cylinder is arranged in the center inside the cylinder body. The upper end and the lower end of the middle cylinder are respectively connected with cylinder body in a sealed mode, the middle cylinder is sleeved with the spiral tube banks, and the spiral tube banks comprise multiple spiral tubes which are embedded from inside to outside. The upper end and the lower end of each spiral tube serve as an inlet and an outlet of high-temperature media. A low-temperature medium inlet, a low-temperature medium outlet, a high-temperature medium inlet and a high-temperature medium outlet are formed in the tube body, the inlet ends and the outlet ends of the spiral tube banks are connected in series between the high-temperature medium inlet and the high-temperature medium outlet, and the high-temperature medium inlet and the high-temperature medium outlet connected with the inlet ends and the outlet ends of the spiral tube banks respectively in a sealed mode. The tube banks in parallel are used and ascend in a spiral mode, so that the effect of increasing heat exchange area in a certain space is achieved; the flowing state can be changed through spiral flowing channels to form turbulent flows, and therefore the problems of scaling and blocking are solved.