Microchannel heat exchanger

Abstract

The present invention provides a microchannel heat exchanger with a simple structure made of parts that can be formed by press working. The present invention is a microchannel heat exchanger 1, which has a cylindrical housing part 2 and a rectangular shaped heat exchange part 3 whose four corners are integrally connected to the inner periphery of the cylindrical housing part 2, the cylindrical housing part 2 being formed by the frame section 31 of the first plate unit 30 and the frame section 41 of the second plate unit 40, and the heat exchange part 3 is formed by the closing plate part 32 of the first plate unit 30 and the heat exchange fluid plate part 42 of the second plate unit 40.

What is claimed is: 
     
         1 . the microchannel heat exchanger of the present invention by comprising a cylindrical housing part; rectangular shaped heat exchange part with four corners integrally connected to an inner surface of the cylindrical housing part, four fluid passages defined between the inner surface of the cylindrical housing part and the heat exchange part; a lid plate that closes one end of the cylindrical housing part and has four fluid inlets and outlets that are connected to each of the four fluid passages; and a bottom plate shielding the other end of the cylindrical housing part,
 wherein the heat exchange part has a first heat exchange passageway connecting two fluid passages arranged opposite each other and a second heat exchange passageway connecting another two fluid passages arranged opposite each other, wherein the first heat exchange passageway and the second heat exchange passageway are arranged alternately orthogonal to each other in the axial direction of the cylindrical housing part,   wherein a first plate unit comprises an annular frame part forming the cylindrical housing part and a square-shaped closing plate part whose four corners are integrally connected with the annular frame part, and has four fluid passage formation spaces between the annular frame part and the closing plate part to form the four fluid passages,   wherein a second plate unit comprises an annular frame part that forms the cylindrical housing part and a rectangular heat exchange channel plate part whose four corners are integrally connected to the annular frame part and whose short side is equal to one side of the closing plate part, wherein the second plate unit has four spaces for forming the four fluid passages between the annular frame part and the heat exchange channel plate part, and wherein the heat exchange channel plate has a plurality of microchannel openings extending along a longitudinal direction thereof, and   wherein the cylindrical housing part and the heat exchange part are composed of alternating layers of first and second plate units, and the second plate units are alternately rotated 90°.