SHELL-AND-TUBE HEAT EXCHANGER AND METHOD FOR ITS ASSEMBLY Russian patent published in 2004 - IPC

FIELD: applicable for manufacture of heat exchangers, mainly for internal combustion engines of transport facilities.

SUBSTANCE: the shell-and-tube heat exchanger has a shell positioned in which is a bank of heat-exchange tubes with cooling ribs fastened by the ends of the tubes in the through holes of the tube plates, the ends of the tubes project outside the limits of the tube plate, and the interplate space is divided by transversal partitions forming the refrigerated cube with inlet and outlet connections of the intertube medium, and the intratube medium feed and discharge connections connected to the shell flanges on both sides of the heat exchanger, one of the tube plates is fixed between the shell flange and the header, and the other is positioned hermetically inside the shell for longitudinal motion at temperature variations of the bank length of the heat-exchange tubes, mounted by the terminal parts of the tubes in the through holes of the tube plates by mandrelling, the through holes in the tube plates are step-shaped, at least on the side of the end of the heat-shaped, at least on the side of the end of the heat-exchange tube, besides, the length of connection of the heat-exchange tube to the tube plate is selected from conduction 0,5d_hole<T<2,0d_hole , where T- the length of connection of the heat-exchange tube to the tube plate, d_hole - the diameter of the through hole of the tube plate. The method for assembly of the shell-and-tube heat exchanger consists in sealing of the terminal parts of the heat-exchange tubes in the through holes of the tube plates, to this end, the tube ends are driven through the tube plate through the through holes of the walls and sealed in the through holes by mandrelling, after which the flexible material of the wall of the through hole squeezes the outside and inside diameters of the heat-exchange tube at the length of engagement with the tube plate by the value of flexible expansion of the through hole, caused by mandrelling of the plastic terminal part of the heat-exchange tube at longitudinal motion of the cylindrical mandrel relative to the tube plate, the through holes in the tube plates are worked with the wall roughness within 6.3 to 25mkμ, and mandrelling of the terminal parts of the heat-exchange tube in the through holes of the tube plates is conducted up to the increase of the outside diameter of the terminal part of the tube to a dimension at least exceeding the diameter of the through hole to the depth of the roughness at a longitudinal motion of the mandrel maximum diameter over a length equal to the thickness of the tube plate.

EFFECT: enhanced reliability of connection of tubes to the tube plate, reduced force of mandrelling during assembly of the heat exchanger.