US 12,313,348 B2
Flat tube, multi-channel heat exchanger, and air conditioning and refrigeration system
Guangfei Wei, Zhejiang (CN); Jianlong Jiang, Zhejiang (CN); Qiang Gao, Zhejiang (CN); and Haobo Jiang, Zhejiang (CN)
Assigned to SANHUA (HANGZHOU) MICRO CHANNEL HEAT EXCHANGER CO., LTD., Zhejiang (CN)
Appl. No. 17/614,867
Filed by SANHUA (HANGZHOU) MICRO CHANNEL HEAT EXCHANGER CO., LTD., Zhejiang (CN)
PCT Filed Jun. 1, 2020, PCT No. PCT/CN2020/093677
§ 371(c)(1), (2) Date Nov. 29, 2021,
PCT Pub. No. WO2020/239120, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 201920819017.8 (CN), filed on May 31, 2019; application No. 201920820825.6 (CN), filed on May 31, 2019; and application No. 201920820935.2 (CN), filed on May 31, 2019.
Prior Publication US 2022/0236015 A1, Jul. 28, 2022
Int. Cl. F28D 7/00 (2006.01); F28D 7/16 (2006.01)
CPC F28D 7/1684 (2013.01) 6 Claims
OG exemplary drawing
 
1. A multi-channel heat exchanger, comprising:
a first header, a second header, and a plurality of flat tubes,
wherein for each of the plurality of flat tubes, the flat tube has a first longitudinal side face and a second longitudinal side face opposite to and parallel to each other in a thickness direction of the flat tube, and a third longitudinal side face and a fourth longitudinal side face opposite to and parallel to each other in a width direction of the flat tube; a distance between the first longitudinal side face and the second longitudinal side face is less than a distance between the third longitudinal side face and the fourth longitudinal side face; the flat tube has n groups of flow channels extending in a length direction of the flat tube, and the n groups of flow channels are distributed to be spaced apart in the width direction of the flat tube; and a flow cross-sectional area of a first group of the flow channels is A1, a flow cross-sectional area of kth group of the flow channels is Ak, a flow cross-sectional area of an nth group of the flow channels is An, 1<k≤n, Ak≥1.2Ak-1 and k is an integer greater than 1;
wherein the plurality of flat tubes are arranged in parallel in a thickness direction of the flat tubes, a first end of each flat tube is connected to the first header, and a second end of each flat tube is connected to the second header, so as to connect the first header and the second header; and
a first group of flow channels, a kth group of flow channels, an nth group of flow channels of the flat tube are sequentially arranged in a direction from an air inlet side to an air outlet side, the first group of flow channels being arranged close to the air inlet side; and
a first to nth group of fins, wherein the first to nth group of fins are all installed between a first longitudinal side face of one of the flat tubes of the plurality of flat tubes and a second longitudinal side face of an adjacent flat tube of the plurality of flat tubes, and the first to nth groups of fins are sequentially arranged in a width direction of the flat tubes, the first group of fins corresponds to the first group of flow channels, the kth group of fins corresponds to the kth group of flow channels, the nth group of fins corresponds to the nth group of flow channels;
wherein each of the first to nth groups of fins is provided with a plurality of slats arranged in the width direction of the flat tube, an louver angle of the slat of the first group of fins is R1, an louver angle of the slat of the kth group of fins is Rk, an louver angle of the slat of the nth group of fin is Rn, and Rk>R(k−1).