US 11,913,729 B2
Heat exchanger
Tooru Andou, Osaka (JP); Tomohiro Nagano, Osaka (JP); Hirokazu Fujino, Osaka (JP); and Yoshiyuki Matsumoto, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Jan. 13, 2023, as Appl. No. 18/154,202.
Application 18/154,202 is a continuation of application No. PCT/JP2021/026070, filed on Jul. 12, 2021.
Claims priority of application No. 2020-123313 (JP), filed on Jul. 17, 2020.
Prior Publication US 2023/0168043 A1, Jun. 1, 2023
Int. Cl. F28D 7/16 (2006.01); B21D 53/06 (2006.01); F28F 1/04 (2006.01); F28F 9/02 (2006.01)
CPC F28D 7/16 (2013.01) [B21D 53/06 (2013.01); F28F 1/04 (2013.01); F28F 9/02 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A heat exchanger comprising:
refrigerant channels that:
extend in a first direction,
are disposed along a second direction intersecting with the first direction, and
are disposed along a third direction intersecting with the first direction and the second direction; and
heat transfer tubes defining the refrigerant channels, wherein
one or both of a size of an outer edge and a size of an inner edge of the heat transfer tubes are different between a first position and a second position in the first direction,
outer surfaces of the heat transfer tubes each comprise a protrusion that:
protrudes in a direction intersecting with the first direction, and
is in contact with an outer surface of one of the heat transfer tubes adjacent thereto in the second direction,
the protrusion comprises a concave portion extending along the third direction.