Floating Head Type Heat Exchanger

New type of floating head type heat exchanger end structure, which comprises a cylinder cover, outside side flange, tube sheet, circle hook, floating head cover and outer cover and screw hole, steel and other components, and is characterized in that the outer cover is provided with a concave inner surface side of the flange or ladder type sealing surface, and the outer sealing surface in the near the side drilling and threading screw or welding a plurality of uniform, floating cancel hook ring and related parts, tube plate sealing groove for the original concave groove and the other to open a center as the center of the tube plate at the same end, trapezoidal grooves is slightly larger than the outer diameter of the tube radius, and the tube plate split grooves only with trapezoidal grooves communicated, but not with the concave groove communicated.