Shell-and-tube helix flat tube heat exchanger

The utility model relates to a shell-and-tube helix flat tube heat exchanger, which fundamentally solves the problems that the traditional shell-and-tube segmental baffle heat exchanger has shell-sideflowing dead zone and large shell-side pressure decrease, and is characterized in that a heat exchanging tube in a tube bundle is of a plurality of helix flat tubes, the long axis part of two adjacent helix flat tubes can be contacted with each other to form support and blocking, the short axis part correspondently forms a gap, and finally a netted flow passage is formed in the tube bundle; the gap between circular tube parts on two ends of the heat exchanging tube is provided with a cross blocking tube bracket corresponding to a partition plate inside a corresponding tube box, a plurality ofblocking tubes which are lined up in parallel with the heat exchanging tubes are arranged between the blocking tube brackets, the long axis part of the blocking and the heat exchanging tubes is contacted with each other, the short axis part is opposite to each other, a guide tightening cylinder which is provided with a plurality of annular barrier plates is sleeved on the outer part of the heat exchanging tube, and the guide tightening cylinder is welded on a barrier tube bracket. Compared with the prior helix flat tube heat exchanger, the shell-and-tube helix flat tube heat exchanger has theadvantages that the heat exchanging efficiency can be greatly improved, thereby being widely applicable to the industries such as oil refining, petroleum chemical engineering, metallurgy, electric power and the like.