US 11,807,539 B2
Heat exchanger and manufacturing method thereof
Hai Huang, Zhejiang (CN); Jianhua Tang, Zhejiang (CN); Ming Xue, Zhejiang (CN); Shurui Yu, Zhejiang (CN); and Linjie Huang, Zhejiang (CN)
Assigned to Hangzhou Sanhua Research Institute Co., Ltd., Hangzhou (CN)
Filed by Hangzhou Sanhua Research Institute Co., Ltd., Zhejiang (CN)
Filed on Apr. 27, 2022, as Appl. No. 17/730,842.
Application 17/730,842 is a continuation in part of application No. PCT/CN2021/142552, filed on Dec. 29, 2021.
Claims priority of application No. 202110023747.9 (CN), filed on Jan. 8, 2021.
Prior Publication US 2022/0250921 A1, Aug. 11, 2022
Int. Cl. C01B 33/159 (2006.01); F28F 19/06 (2006.01); C09D 1/00 (2006.01); C01G 23/04 (2006.01); C09D 7/62 (2018.01); B82Y 30/00 (2011.01); F28F 21/00 (2006.01)
CPC C01B 33/159 (2013.01) [C01G 23/04 (2013.01); C09D 1/00 (2013.01); C09D 7/62 (2018.01); F28F 19/06 (2013.01); B82Y 30/00 (2013.01); C01P 2004/64 (2013.01); F28F 21/00 (2013.01); F28F 2245/02 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A heat exchanger, comprising:
a metal substrate having a fluid channel for circulating a heat exchange medium; and
a coating comprising a rare earth conversion coating and a hydrophilic coating;
wherein the rare earth conversion coating is arranged to cover at least part of a surface of the metal substrate, and the rare earth conversion coating comprises a rare earth element-containing compound; at least part of the hydrophilic coating is further away from the metal substrate than the rare earth conversion coating; and
wherein a weight per unit area of the rare earth conversion coating ranges from 0.75 g/m2 to 1.5 g/m2, and a weight per unit area of the hydrophilic coating ranges from 4 g/m2 to 10 g/m2.
 
11. A manufacturing method of a heat exchanger, comprising:
providing a metal substrate, a rare earth conversion coating material and a hydrophilic coating material, wherein the metal substrate has at least one fluid channel for circulating a heat exchange medium;
applying the rare earth conversion coating material to at least part of a surface of the metal substrate, and curing, to obtain a rare earth conversion coating, wherein the rare earth conversion coating material comprising a rare earth element-containing compound; and
applying the hydrophilic coating material to at least part of a surface of the rare earth conversion coating, and curing, to obtain the heat exchanger;
wherein a weight per unit area of the rare earth conversion coating ranges from 0.75 g/m2 to 1.5 g/m2, and a weight per unit area of the hydrophilic coating ranges from 4 g/m2 to 10 g/m2.
 
19. A heat exchanger, comprising:
a first collecting pipe defining a first chamber;
a second collecting pipe defining a second chamber, the second collecting pipe being separated from the first collecting pipe;
a plurality of flat tubes connecting the first collecting pipe to the second collecting pipe, each of the flat tube defining a row of micro-channels, the micro-channels being fluidic communication with the first chamber and the second chamber for flowing refrigerant therebetween;
a plurality of corrugated fins each sandwiched between two adjacent flat tubes, the fin comprising a plurality of crests connecting to one of the two adjacent flat tubes and a plurality of troughs connecting to the other one of the two adjacent flat tubes; and
a coating layer comprising a rare earth conversion coating layer and a hydrophilic coating layer, the rare earth conversion coating layer attached to at least one surface of the corrugated fin, the flat tube, and the collecting pipe;
wherein the hydrophilic coating layer is stacked on the rare earth conversion coating layer, and the rare earth conversion coating layer is sandwiched between the hydrophilic coating and the at least one surface of the corrugated fin, the flat tube, and the collecting pipe; and
wherein a weight per unit area of the rare earth conversion coating ranges from 0.75 g/m2 to 1.5 g/m2, and a weight per unit area of the hydrophilic coating ranges from 4 g/m2 to 10 g/m2.