US 12,228,350 B2
Heat exchanger and refrigeration cycle apparatus
Yoji Onaka, Tokyo (JP); and Takashi Matsumoto, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/766,735
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 11, 2019, PCT No. PCT/JP2019/044086
§ 371(c)(1), (2) Date Apr. 6, 2022,
PCT Pub. No. WO2021/095087, PCT Pub. Date May 20, 2021.
Prior Publication US 2024/0085122 A1, Mar. 14, 2024
Int. Cl. F28F 17/00 (2006.01); F28D 21/00 (2006.01); F28F 1/12 (2006.01)
CPC F28F 1/128 (2013.01) [F28D 21/00 (2013.01); F28F 17/005 (2013.01); F28D 2021/0068 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A heat exchanger comprising:
a plurality of flat heat exchange tubes each having an elongated cross section and planar outer surfaces that face each other in a horizontal direction, the flat heat exchange tubes each including a fluid flow passage therein; and
a plurality of corrugated fins each formed in the shape of waves and provided between associated adjacent ones of the flat heat exchange tubes, each of the corrugated fins having ridge portions that correspond to ridges of the waves and that are joined to the associated flat heat exchange tubes, the corrugated fin having portions that are located between the ridge portions and formed as fins that are arranged in a height direction,
wherein the fins include respective drain slits each of which allows water on an associated one of the fins to be drained therethrough, and end portions of the drain slits of any adjacent three of the fins are located at different positions in the horizontal direction, the any adjacent three fins being adjacent to each other in the height direction.