Main structure It is made up of several parallel corrugated pipes in the jacket of a shell pipe, to form a compound pipe. The compound pipes are connected with each as a step, the inner pipe of each step connected by U pattern pipe ,and the outer pipe connected with material apter removing the pipe hole cover. The medium flows in the outer pipe in the anti clean direction, takes heat exchange through the inner pipe. The inner wall of the material pipe adopts advance polish Ra<0.4um,the pipe edge joint adopts imported automatic joint machine jointing, so to ensure the complete clean of the heat-exchanging pipe. Main characteristics 1.hard to burn, long working time; 2.easy to clean, low cost; 3.reliable material, high anti-pressure. Application field 1.high viscosity product; 2.product of fiber containing, and big fruit particles containing; 3.product of high acerbity ,and corrosive to the dead angles; 4.cooling the fermented yoghourt ,and keeping the original flavour;