Heat transfer fin

Patent metadata

Field	Value
Publication number	US-2020116389-A1
Application number	US-201916567349-A
Country	US
Kind code	A1
Filing date	Sep 11, 2019
Priority date	Oct 15, 2018
Publication date	Apr 16, 2020
Grant date	—

Abstract

A heat transfer fin (1) includes a plurality of heat-transfer-tube insertion holes (10) aligned in a single stage, a downstream cut portion (3) formed so as to be recessed toward an upstream side of a gas flow passage of combustion exhaust gas, a downstream flange (13) formed on a peripheral edge of the downstream cut portion (3) so as to protrude from one surface of the heat transfer fin (1), and a plurality of first protruding pieces (4a) (4b) (4c) formed between the heat-transfer-tube insertion hole (10) and the downstream flange (13) so as to protrude alternately from both surfaces of the heat transfer fin (1).

First claim

What is claimed is:

1 . A heat transfer fin in a flat plate shape arranged in a heat exchanger through which combustion exhaust gas flows, the heat transfer fin comprising:
a plurality of heat-transfer-tube insertion holes aligned in a single stage; a downstream cut portion provided downstream of a gas flow passage of the combustion exhaust gas between adjacent heat-transfer-tube insertion holes, and formed so as to be recessed toward an upstream side of the gas flow passage of the combustion exhaust gas; a downstream flange formed on a peripheral edge of the downstream cut portion so as to protrude from one surface of the heat transfer fin; and a plurality of first protruding pieces formed between the heat-transfer-tube insertion hole and the downstream flange so as to protrude alternately from both surfaces of the heat transfer fin.

2 . The heat transfer fin according to claim 1 , further comprising:
a plurality of second protruding pieces formed between the adjacent heat-transfer-tube insertion holes so as to protrude alternately from both the surfaces of the heat transfer fin.

3 . The heat transfer fin according to claim 2 ,
wherein the first protruding pieces protrude so as to be substantially orthogonal to the gas flow passage of the combustion exhaust gas flowing from the upstream side to a downstream side between the heat-transfer-tube insertion hole and the downstream flange, and the second protruding pieces protrude so as to be substantially orthogonal to the gas flow passage of the combustion exhaust gas flowing from the upstream side to the downstream side between the adjacent heat-transfer-tube insertion holes.

4 . The heat transfer fin according to claim 2 ,
wherein the first protruding piece and the second protruding piece have, respectively, a first cut-and-raised portion and a second cut-and-raised portion each formed by cutting and raising a part of the heat transfer fin, and the downstream flange has a protrusion height higher than protrusion heights of the first cut-and-raised portion and the second cut-and-raised portion on one surface side of the heat transfer fin.

5 . The heat transfer fin according to claim 1 , further comprising:
an upstream protrusion formed between the heat-transfer-tube insertion hole and an upstream edge of the heat transfer fin so as to protrude from the one surface of the heat transfer fin.

6 . The heat transfer fin according to claim 1 , further comprising:
an upstream cut portion provided upstream of the gas flow passage of the combustion exhaust gas between the adjacent the heat-transfer-tube insertion holes, and formed so as to be recessed toward the downstream side of the gas flow passage of the combustion exhaust gas.

Assignees

• Rinnai Kk

Inventors

• Kimura Ai

Classifications

• F28F1/325

  Fins with openings · CPC title

• F28F2240/00

  Spacing means · CPC title

• F24H1/145 Primary

  using fluid fuel · CPC title

• F28F1/42

  the means being both outside and inside the tubular element · CPC title

• Y02B30/00

  Energy efficient heating, ventilation or air conditioning [HVAC] · CPC title