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US 12,753,336 B2Granted
Heat exchanger
AssigneeDaikin Industries, Ltd.
InventorsMichiru Kagawa, Masamichi Morita, Ryo Inoue, Hiroki Yamaguchi, Tomohiro Nagano, Masatoshi Nose
Life of this patent
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Abstract
A heat exchanger including an aluminum substrate, and a water-repellent coating provided on a surface of the aluminum substrate, wherein the aluminum substrate has an anodized film on the surface, and the water-repellent coating is a film formed of a fluoropolyether group-containing compound.
Claims18
A heat exchanger comprising an aluminum substrate, and a water-repellent coating provided on a surface of the aluminum substrate, wherein
- the aluminum substrate has an anodized film on the surface,
- the water-repellent coating is a film formed of a fluoropolyether group-containing compound,
- wherein the surface of the aluminum substrate having the anodized film has a surface structure containing a plurality of protruding portions, and
- L is taken as an average pitch of the plurality of protruding portions,
- D is taken as an average diameter of the plurality of protruding portions,
- H is taken as an average height of the plurality of protruding portions, and
- θ is taken as a contact angle of water on a smooth plane of the water-repellent coating, all of relationships:
- D
- /
- L
- <
- 0
- .
- 3
-
- 6
- ,
- D
- /
- L
- >
- 0.4
- ×
- (
- L
- /
- H
- )
- ,
- H
- >
- 700
-
- nm
- ,
- 0
- >
- 1.28
- ×
- D
- ×
- 10
- -
- 2
- +
- 2.77
- ×
- (
- L
- -
- D
- )
- ×
- 1
-
- 0
- -
- 3
- -
- 1.1
- ×
- D
- 2
- ×
- 1
-
- 0
- -
- 5
- -
- 5.3
- ×
- (
- L
- -
- D
- )
- 2
- ×
- 10
- -
- 7
- -
- 9.8
- ×
- D
- ×
- (
- L
- -
- D
- )
- ×
- 10
- -
- 6
- -
- 2.
- ,
- and
-
- 90
- ∘
- <
- θ
- <
- 1
-
- 2
-
- 0
- ∘
- are satisfied.
110 more elements
Dependencies are inferred from the claim text.