METHOD OF MAKING MULTILAYER COIL HEAT EXCHANGER Russian patent published in 2020 - IPC F28D7/02 B21D53/06 

FIELD: machine building.

SUBSTANCE: invention relates to power engineering and can be used for winding heat exchangers in nuclear industry, as well as in gas, chemical and other industries. Method of making a multilayer coil-shaped heat exchanger comprises placing a support grid on one end of a central cylindrical mandrel with holes for the ends of the pipes, consecutive coiling of rows of coil pipes, installation of an output reference grid made of a composite of concentric annular elements with arrangement of holes for output ends of pipes on circles of connectors, assembly is performed successively after winding of each row with subsequent fixation of pipe ends in tube plates, at that, the input support grid lodgments are made in the form of a semi-ring, and the input support grid is made of concentric rings, then the pipe is temporarily fixed by means of a detachable fixture, after which is wound on spacer rails installed on central cylindrical mandrel along its axis, after winding end of pipe is removed, is bent by pipe-bending device and is placed into lodgment ring of outlet support grid and lodgments of intermediate arrays, wherein tube is temporarily fixed by means of detachable retainer and at outlet of last intermediate grid end of pipe is bent using pipe-bending device and is placed in coaxially arranged lodgments of detachable multisector plates for fixation of center-to-center distance between pipes, connected by detachable fastening connection with polygons of process mandrel and having fixed pitch between lodgments, then all the pipes of the beam are simultaneously fed into the tube plate, then the next row rings are installed, after completion of winding of all pipes of the tube bundle, pipes are rolled to tube plates with subsequent cutting of pipe ends and welding of pipes to tube plates, after which all removable multi-sector plates are dismantled.

EFFECT: improving manufacturing accuracy.

4 cl, 9 dwg