Kim, Yeung-Saeng; Youn, Baek;

Heat exchanger of air conditioner

A heat exchanger includes parallel fins mounted on heat-transfer pipes which project through the fins. Each fin includes groups of slits disposed between the pipes. Each group includes an upper tier of slits, and a lower tier of slits located below the upper tier. Each tier includes four slits arranged in a radiant (radial) relationship with respect to a respective pipe. Each slit has a cross section which becomes larger in a direction away from the respective pipe.

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What is claimed is:

1. A heat exchanger of an air conditioner comprising generally flat fins arranged in parallel to conduct fluid therebetween in a flow direction, and heat transfer pipes extending through the flat fins and arranged in a zig-zag pattern; each fin including a plurality of slits; the slits arranged in groups, each group disposed between first and second adjacent pipes, the adjacent pipes spaced apart in a transverse direction extending transversely of the flow direction; each group of slits including a first tier of slits, each slit of the first tier arranged generally radially with respect to the first pipe and a second tier of slits each slit of which being arranged generally radially with respect to the second pipe; each slit of the first and second tiers including inner and outer ends, the first end disposed proximate the respective pipe and spaced therefrom by a solid non-slit portion of the fin; the outer ends of the slits in the first tier opposing the outer ends of respective slits of the second tier and spaced therefrom in the transverse direction by a solid non-slit portion of the fin; there being only two tiers of slits in each group of slits; a plurality of the slits of each tier protecting from one side of the fin, and another plurality of the slits of each tier projecting from an opposite side of the fin.

2. The heat exchanger according to claim 1, wherein each of the first and second tiers includes four slits; each group of slits further including a pair of transverse slits extending perpendicularly to the flow direction, a first portion of each perpendicular slit disposed between two slits of the first tier, and a second portion of each transverse slit disposed between two slits of the second tier.

3. The heat exchanger according to claim 2, wherein each of said four slits of each tier is formed by a pair of bent-out portions of the fin, one of the bent-out portions of each pair extending farther from a main plane of the fin than the other bent out portion of the pair.

4. The heat exchanger according to claim 2, wherein two of the four slits of each tier are formed by portions of the fin bent-out from one side of the fin, and the other two of the four slits of each tier are formed by portions of the fin bent out from the other side of the fin.

5. The heat exchanger according to claim 2, wherein an upstream-most slit of the first tier is spaced transversely from an upstream-most slit of the second tier by a first distance; and a slit located immediately downstream of the upstream-most slit of the first tier is spaced by a second transverse distance from a slit located immediately downstream of the upstream-most slit of the second tier; the first distance being greater than the second distance.

6. The heat exchanger according to claim 5 wherein a downstream-most slit of the first tier is spaced transversely from a downstream-most slit of the second tier by a first distance; a slit of the first tier located immediately upstream of the downstream-most slit thereof being spaced by a second transverse distance from a slit of the second tier located immediately upstream of the downstream-most slit of the second tier; the first distance being greater than the second distance.