Flat Tube for Microchannel Heat Exchanger and Microchannel Heat Exchanger

Abstract

The disclosure provides a flat tube for a microchannel heat exchanger and the microchannel heat exchanger, and relates to the field of air conditioners. The flat tube includes a first wallboard ( 1.1 ) and a second wallboard ( 1.2 ) that are formed separately; and the first wallboard ( 1.1 ) and/or the second wallboard ( 1.2 ) have/has a plurality of protrusion portions protruding into a refrigerant circulation cavity, to form multiple refrigerant channels arranged along a length direction of the flat tube. The flat tube for the microchannel heat exchanger uses a stamping method, thus reducing a production cost and a production difficulty.

What is claimed is: 
     
         1 . A flat tube for a microchannel heat exchanger, comprising a first wallboard and a second wallboard that are formed separately, wherein the first wallboard is connected to the second wallboard to form a refrigerant circulation cavity,
 the first wallboard has a plurality of protrusion portions protruding into the refrigerant circulation cavity to form multiple refrigerant channels, arranged along a length direction of the flat tube, in the refrigerant circulation cavity;   or the second wallboard has a plurality of protrusion portions protruding into the refrigerant circulation cavity to form multiple refrigerant channels, arranged along a length direction of the flat tube, in the refrigerant circulation cavity;   or the first wallboard and the second wallboard both have a plurality of protrusion portions protruding into the refrigerant circulation cavity to form multiple refrigerant channels, arranged along a length direction of the flat tube, in the refrigerant circulation cavity.   
     
     
         2 . The flat tube as claimed in  claim 1 , wherein the protrusion portions comprises a first protrusion and a second protrusion, the first protrusion protrudes from the first wallboard to the second wallboard, the second protrusion protrudes from the second wallboard to the first wallboard, and the first protrusion and the second protrusion are abutted against each other and connected; or the protrusion portions comprises a first protrusion and a second protrusion, the first protrusion protrudes from the first wallboard to the second wallboard, the second protrusion protrudes from the second wallboard to the first wallboard, the first protrusion is connected to the second wallboard, the second protrusion is connected to the first wallboard, and the first protrusion and the second protrusion are distributed in a staggered manner. 
     
     
         3 . The flat tube as claimed in  claim 2 , wherein a part of the first wallboard is recessed into the refrigerant circulation cavity to form the first protrusion, a part of the second wallboard is recessed into the refrigerant circulation cavity to form the second protrusion, and the first protrusion and the second protrusion are 0.3 mm-1.0 mm high. 
     
     
         4 . The flat tube as claimed in  claim 3 , wherein the first wallboard and the second wallboard are the same in structure. 
     
     
         5 . The flat tube as claimed in  claim 1 , wherein the protrusion portions protrudes from the first wallboard to the second wallboard, and the protrusion portions is connected to the second wallboard; or the protrusion portions protrudes from the second wallboard to the first wallboard, and the protrusion portions is connected to the first wallboard. 
     
     
         6 . The flat tube as claimed in  claim 5 , wherein the protrusion portions is formed by recessing a part of the first wallboard into the refrigerant circulation cavity; or the protrusion portions is formed by recessing a part of the second wallboard into the refrigerant circulation cavity, and the protrusion portions is 0.5 mm-1.2 mm high. 
     
     
         7 . The flat tube as claimed in  claim 2 , wherein there are multiple first protrusions and multiple second protrusions, any of three adjacent first protrusions of the multiple first protrusions on the first wallboard or any of three adjacent second protrusions of the multiple second protrusions on the second wallboard form an included angle θ=2 arctan Lv/Lh along a refrigerant flowing direction, where the Lv is a distance between two adjacent first protrusions of the multiple first protrusions along a width direction of the first wallboard or two adjacent second protrusions of the multiple second protrusions along a width direction of the second wallboard, and the Lh is a distance between the two adjacent first protrusions along a length direction of the first wallboard or the two adjacent second protrusions along a length direction of the second wallboard. 
     
     
         8 . The flat tube as claimed in  claim 7 , wherein the included angle θ is 60°-150°. 
     
     
         9 . The flat tube as claimed in  claim 1 , wherein when the protrusion portions is of a truncated cone-shaped, a top diameter Di of the protrusion portions and a bottom diameter Do of the protrusion portions meet: Do=Di+2*d*tan α, the α being a draft angle of the protrusion portions. 
     
     
         10 . The flat tube as claimed in  claim 9 , wherein the draft angle is 10°-25°. 
     
     
         11 . The flat tube as claimed in  claim 1 , wherein there are multiple protrusion portions, the multiple protrusion portions are distributed at intervals along a length direction of the flat tube in the refrigerant circulation cavity, so as to form, between adjacent protrusion portions of the multiple protrusion portions, a space for allowing mutual circulation of a refrigerant in adjacent refrigerant channels. 
     
     
         12 . The flat tube as claimed in  claim 1 , wherein the first wallboard has a first groove sinking towards a direction away from the second wallboard, the second wallboard has a second groove sinking towards a direction away from the first wallboard, and a sidewall of the first groove is connected to a sidewall of the second groove to form the refrigerant circulation cavity. 
     
     
         13 . The flat tube as claimed in  claim 12 , wherein the sidewall of the first groove extends out of the first groove to form a first turnup, the sidewall of the second groove extends out of the second groove to form a second turnup, and the first turnup and the second turnup are connected to each other. 
     
     
         14 . The flat tube as claimed in  claim 13 , wherein the sidewall of the first groove and the sidewall of the second groove are at least partially overlapped to each other, and an overlapped portion is fixed by welding. 
     
     
         15 . The flat tube as claimed in  claim 1 , wherein the first wallboard has a groove sinking towards a direction away from the second wallboard, a sidewall of the groove extends out of the groove to form a turnup, and the turnup is connected to the second wallboard; or the second wallboard has a groove sinking towards a direction away from the first wallboard, a sidewall of the groove extends out of the groove to form a turnup, and the turnup is connected to the first wallboard. 
     
     
         16 . The flat tube as claimed in  claim 1 , wherein a thickness of the first wallboard and a thickness of the second wallboard are 0.2 mm-0.8 mm. 
     
     
         17 . A microchannel heat exchanger, comprising the flat tube as claimed in  claim 1 . 
     
     
         18 . The microchannel heat exchanger as claimed in  claim 17 , wherein the microchannel heat exchanger is of a straight panel shape, a circular shape, a square shape, an L shape, a U shape or a V shape.