Heat transfer fin and heat exchanger using thereof

Patent metadata

Field	Value
Publication number	US-10254053-B2
Application number	US-201615054345-A
Country	US
Kind code	B2
Filing date	Feb 26, 2016
Priority date	Mar 16, 2015
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

A heat transfer fin (31) made of stainless steel-based metal for a heat exchanger, has a plurality of upper stage heat-transfer-tube insertion holes (611), a plurality of lower stage heat-transfer-tube insertion holes formed (612), upper end cut portions (651) formed between the adjacent upper stage heat-transfer-tube insertion holes (611), and lower end cut portions (652) formed between the adjacent lower stage heat-transfer-tube insertion holes (612), wherein the upper end cut portions (651) are formed so as to extend from a fin upper end portion (311) beyond lower ends of the upper stage heat-transfer-tube insertion holes (611) to positions in the vicinity of upper ends of the lower stage heat-transfer-tube insertion holes (612), and the lower end cut portions (652) are formed so as to extend from a fin lower end portion (312) to positions above the lower ends of the lower stage heat-transfer-tube insertion holes (612).

First claim

The invention claimed is:

1. A heat transfer fin made of stainless steel-based metal capable of use in a heat exchanger, wherein
the heat exchanger has a heat exchanger body in which combustion exhaust gas flows from an upper opening toward a lower opening, and a plurality of heat transfer fins disposed between two opposed side walls of the heat exchanger body, wherein
the plurality of heat transfer fins are arranged in parallel with a predetermined clearance therebetween;
the heat transfer fin comprising:
a plurality of upper stage heat-transfer-tube insertion holes each of which has a substantially elliptical shape elongated in a vertical direction, formed in an upper stage;
a plurality of lower stage heat-transfer-tube insertion holes each of which has a substantially elliptical shape elongated in the vertical direction, formed in a lower stage;
upper end cut portions formed between adjacent ones of the plurality of upper stage heat-transfer-tube insertion holes;
lower end cut portions formed between adjacent ones of the plurality of lower stage heat-transfer-tube insertion holes;
upper stage support flanges formed along circumferential edges of the plurality of upper stage heat-transfer-tube insertion holes;
lower stage support flanges formed along circumferential edges of the plurality of lower stage heat-transfer-tube insertion holes;
burring holes formed below the plurality of upper stage heat-transfer-tube insertion holes; and
standing flanges formed along circumferential edges of the burring holes, wherein
centers of the plurality of upper stage heat-transfer-tube insertion holes and the plurality of lower stage heat-transfer-tube insertion holes are displaced from one another in a transverse direction,
the upper end cut portions are formed so as to extend from a fin upper end portion beyond lower ends of the plurality of upper stage heat-transfer-tube insertion holes to positions adjacent to upper ends of the plurality of lower stage heat-transfer-tube insertion holes in the vertical direction,
the lower end cut portions are formed so as to extend from a fin lower end portion to positions above lower ends of the plurality of lower stage heat-transfer-tube insertion holes in the vertical direction,
a width of each of the lower end cut portions in the transverse direction increases downward,
the burring holes are substantially circular holes,
the lower end cut portions have a substantially semicircular shape,
the plurality of upper stage heat-transfer-tube insertion holes, the burring holes, and the lower end cut portions are disposed in the transverse direction in such a manner that a center of each of the burring holes and a center of each of the lower end cut portions are in alignment with a vertical center line of each of the plurality of upper stage heat-transfer-tube insertion holes located thereabove,
the burring holes are disposed in the vertical direction in such a manner that an upper end of each of the burring holes is located above a lower edge of each of the upper end cut portions and a lower end of each of the burring holes is located below the upper end of each of the plurality of lower stage heat-transfer-tube insertion holes, and
an outside diameter of each of the standing flanges is smaller than an outside diameter of each of the upper stage support flanges located thereabove and is equivalent to a minimum distance between adjacent ones of the plurality of lower stage heat-transfer-tube insertion holes.

2. The heat transfer fin according to claim 1 , wherein
an end edge of the fin upper end portion above an outer circumference of each of the plurality of upper stage heat-transfer-tube insertion holes has a substantially identical shape to a side edge of the lower end cut portions located below each of the plurality of upper stage heat-transfer-tube insertion holes.

3. The heat transfer fin according to claim 1 , wherein
each of the upper stage support flanges has an upper notch adjacent to an upper end of a corresponding one of the plurality of upper stage heat-transfer-tube insertion holes, and
an end edge of the fin upper end portion above an outer circumference of each of the upper stage heat-transfer-tube insertion holes has an upper recess above the upper notch of a corresponding one of the plurality of upper stage support flanges.

4. The heat transfer fin according to claim 1 , wherein
each of the lower stage support flanges has a lower notch adjacent to the upper end of a corresponding one of the plurality of lower stage heat-transfer-tube insertion holes, and
a lower edge of the upper end cut portions above the lower notch of each of the lower stage support flanges has a lower recess.

5. A heat exchanger comprising:
a plurality of heat transfer fins according to the heat transfer fin of claim 1 ;
a heat exchanger body; and
a plurality of heat-transfer tubes each of which has a substantially elliptical cross-sectional shape elongated in the vertical direction, wherein each of the plurality of heat-transfer tubes is inserted through a corresponding one of the plurality of upper stage heat-transfer-tube insertion holes or a corresponding one of the plurality of lower stage heat-transfer-tube insertion holes of the plurality of heat transfer fins in a direction perpendicular to the plurality of heat transfer fins between two opposed side walls of the heat exchanger body.

Assignees

• Rinnai Kk

Inventors

• Okamoto Hideo
• Nishino Akifumi

Classifications

• F28F2215/04

  Assemblies of fins having different features, e.g. with different fin densities · CPC title

• F28D7/1692

  with particular pattern of flow of the heat exchange media, e.g. change of flow direction · CPC title

• F28D2021/0024

  for combustion apparatus, e.g. for boilers · CPC title

• F28F1/02

  Tubular elements of cross-section which is non-circular (F28F1/08, F28F1/10 take precedence) · CPC title

• F28F1/32 Primary

  the means having portions engaging further tubular elements · CPC title