Micro-channel heat exchanger and heat pump system having the same

Abstract

A micro-channel heat exchanger comprises: a first manifold and a second manifold; a plurality of micro-channel flat tubes, sequentially connected from top to bottom between the first manifold and the second manifold; and a plurality of heat exchange fins, spaced at a predetermined distance from each other and formed with tube holes for the plurality of micro-channel flat tubes to pass through. The plurality of heat exchange fins have heat dissipation structures. The heat dissipation structures are located above the micro-channel flat tube, and a drainage groove is arranged vertically at the same side of the plurality of heat exchange fins. A portion of at least one heat exchange fin of the plurality of heat exchange fins below the bottommost micro-channel flat tube has a guiding structure for guiding water droplets condensed on the surface of the heat exchange fin to the drainage groove.

What is claimed is: 
     
         1 . A micro-channel heat exchanger, comprising:
 a first manifold and a second manifold, wherein the first manifold and the second manifold are spaced apart;   a plurality of micro-channel flat tubes, sequentially connected from top to bottom between the first manifold and the second manifold; and   a plurality of heat exchange fins, spaced at a predetermined distance from each other and formed with tube holes for the plurality of micro-channel flat tubes to pass through, wherein the plurality of heat exchange fins are provided with heat dissipation structures for increasing heat exchange area, where the heat dissipation structures are located above the micro-channel flat tube, and a drainage groove is arranged vertically at the same side of the plurality of heat exchange fins,   wherein, a portion of at least one heat exchange fin of the plurality of heat exchange fins below the bottommost micro-channel flat tube is provided with a guiding structure for guiding water droplets condensed on a surface of the at least one heat exchange fin to the drainage groove.   
     
     
         2 . The micro-channel heat exchanger according to  claim 1 , wherein the portion of each of the plurality of heat exchange fins below the bottommost micro-channel flat tube is provided with a guiding structure, and the guiding structure has smooth planes on both sides. 
     
     
         3 . The micro-channel heat exchanger according to  claim 1 , wherein the guiding structure is a lower surface of the bottommost micro-channel flat tube. 
     
     
         4 . The micro-channel heat exchanger according to  claim 2 , wherein an area of the portions of the plurality of heat exchange fins below the bottommost micro-channel flat tube gradually increases towards one side of the drainage groove. 
     
     
         5 . The micro-channel heat exchanger according to  claim 4 , wherein the bottom of the guiding structure has a bent, curved, linear or non-linear contour. 
     
     
         6 . The micro-channel heat exchanger according to  claim 1 , wherein the heat dissipation structure for increasing heat exchange area is at least one of a strip structure, a corrugated structure, a staggered teeth structure, a louver structure, a structure with openings, a structure with protrusions, or a structure with grooves on surface. 
     
     
         7 . The micro-channel heat exchanger according to  claim 1 , wherein the plurality of heat exchange fins are of the same size and shape, and are spaced apart from each other at the same distance. 
     
     
         8 . The micro-channel heat exchanger according to  claim 1 , wherein the plurality of heat exchange fins are made of aluminum alloy. 
     
     
         9 . The micro-channel heat exchanger according to  claim 1 , wherein the micro-channel heat exchanger is a condenser or an evaporator. 
     
     
         10 . A heat pump system, wherein the heat pump system comprises the micro-channel heat exchanger according to  claim 1 .