Heat exchanger

Patent metadata

Field	Value
Publication number	US-9939208-B2
Application number	US-201515126442-A
Country	US
Kind code	B2
Filing date	Mar 23, 2015
Priority date	Mar 24, 2014
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A heat exchanger includes: stacked tubes through which a refrigerant flows; and a fin joined to the tube to increase a heat exchange area with air flowing around the tube. A cross-section of the fin perpendicular to a flow direction of the air is shaped in a wave shape that has: planar sections substantially parallel to the flow direction of the air; and a top for connecting between the adjacent planar sections. A clearance is defined in the planar section of the fin. When a portion of the fin where the shortest distance from a center line between the adjacent planar sections becomes the maximum is set as a furthest section in a cross-section perpendicular to a stacking direction of the tubes, the clearance is defined in one furthest section or at least one of a plurality of furthest sections.

First claim

What is claimed is:

1. A heat exchanger comprising:
a plurality of tubes stacked with each other, through which a first fluid flows; and
a fin joined to the tube to increase a heat exchange area with a second fluid flowing around the tube, wherein
a cross-section of the fin that is perpendicular to a flow direction of the second fluid being shaped in a wave shape that has: a plurality of planar sections substantially parallel to the flow direction of the second fluid; and a top for connecting between the adjacent planar sections,
a surface temperature of at least one of the tube and the fin possibly becoming a freezing point or lower,
a clearance is defined in the planar section of the fin, and
a portion of the fin where the shortest distance from a center line between the adjacent planar sections becomes the maximum is defined as a furthest section in a cross-section that is perpendicular to a stacking direction of the tubes, and
the clearance is located in one furthest section or at least one of a plurality of furthest sections, and
the clearance overlaps the tube when seen from the stacking direction of the tubes.

2. The heat exchanger according to claim 1 , wherein,
when a pitch of the fin is set as a fin pitch Fp and when a length of the clearance in the flow direction of the second fluid is set as a clearance width W, the fin pitch and the clearance width satisfy a relationship of W>0.414×Fp+0.0575.

3. The heat exchanger according to claim 1 , wherein
the planar section integrally has a louver that is cut and raised at a predetermined cutting and raising angle with respect to the planar section when seen from the stacking direction of the tubes,
when an angle defined between the adjacent planar sections connected by the top is defined as α, when a length of the fin in the stacking direction of the tubes is defined as FH,
when the cutting and raising angle of the louver is defined as θ, when an average value of a length of the louver in a flow direction of air flowing on a surface of the louver is defined as Lp, when “a” indicates Equation 2, and when “b” indicates Equation 3, and

W
≥

1.8
⁢

a
2

×
sin
⁢

⁢
α

(

2
⁢
a

+
b

)

-

Lp
×
sin
⁢

⁢
θ

[

Equation
⁢

⁢
1

]

a
=

(

Fp
4

+

FH
2

×
tan
⁢

⁢

α
2

)

2

+

(

FH
2

+

Fp
4

×

1

tan
⁢

⁢

α
2

)

2

[

Equation
⁢

⁢
2

]

b
=

Fp
2

+

FH
×
tan
⁢

⁢

α
2

[

Equation
⁢

⁢
3

]

Assignees

• Denso Corp

Inventors

• Sugimura Ryohei
• Inagaki Mitsuharu
• Saito Mitsuyoshi

Classifications

• F28F1/30

  the means being attachable to the element (F28F1/32 takes precedence) · CPC title

• F28D1/05383

  with multiple rows of conduits or with multi-channel conduits (F28D1/05391 takes precedence) · CPC title

• F28D1/053

  the conduits being straight · CPC title

• B60H1/32

  Cooling devices {(B60H1/00478, B60H1/005 take precedence)} · CPC title

• F28D20/02

  using latent heat · CPC title