SPIRAL-TYPE HEAT EXCHANGER AND ITS FABRICATION METHOD Russian patent published in 2009 - IPC F28D9/04 

FIELD: heating.

SUBSTANCE: invention relates to thermotechnics immediately dealing with design of spiral-type heat exchangers and their fabrication methods and is to find application in chemical, food, oil-processing and other industries. The proposed spiral-type heat exchanger is composed of a housing with inlet and outlet nipples, a double-channel spiral fabricated of a sheet material, elements providing for stability of spacing between the spiral sheets, stopper pieces fitted in the channels both sides of the spiral, channel end seals and gasketed caps covering the channel ends. The elements providing for stability of spacing between the spiral sheets are represented by zigzag shaped spacers arranged along the whole of the spiral length. Under the proposed method the spiral-type heat exchanger is fabricated as follows: the zigzag shaped spacers are placed between the sheets during the spiral coiling; then the stopper pieces are laid onto the side edges of the zigzag spacer terminal rows and the channel space between the spiral butt ends and the stopper pieces becomes filled with a sealant material. The heat exchanger housing is pre-fabricated as composed of two semicylinders; after that the pre-coiled spiral is encased with the two semicylinders that become bonded along the whole of the housing length.

EFFECT: heat exchanger structural simplification, simplification of spiral heat exchanger fabrication process and fabrication costs reduction.

7 cl, 6 dwg