Method for Corrosion Protection of Tubing Braze Joints that Connect Copper and Anodic Alloy Treated Aluminum

Patent metadata

Field	Value
Publication number	US-2016290741-A1
Application number	US-201514674719-A
Country	US
Kind code	A1
Filing date	Mar 31, 2015
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

An apparatus and method for a brazed joint is described. A larger diameter pipe is brazed to a smaller diameter pipe. A flare is provided, extending from the end of the larger pipe toward the smaller pipe and radially outward. Such a flare protects the brazed joint from exposure to water and other elements and protects against corrosion. A sealant may also be added between the flare and the smaller pipe to add increased protection.

First claim

What is claimed is:

1 . A brazed joint comprising:
a first pipe; a second pipe, the second pipe comprising a flare, the flare proximate the brazed joint and extending outward radially and toward the first pipe, the flare extending a distance sufficient to shield the brazed joint from corrosion; and a brazing alloy, the brazing alloy connecting an inner surface area of the second pipe to an outer surface area of the first pipe.

2 . The brazed joint of claim 1 wherein the second pipe comprises aluminum.

3 . The brazed joint of claim 1 wherein the first pipe comprises copper.

4 . The brazed joint of claim 1 wherein the second pipe comprises an anodal treatment on its outer surface.

5 . The brazed joint of claim 1 further comprising a sealant between the inside surface of the flare and the first pipe.

6 . The brazed joint of claim 4 wherein the second pipe has been treated with zinc.

7 . The brazed joint of claim 1 wherein the first pipe comprises an inlet to a heat exchanger coil.

8 . The brazed joint of claim 1 wherein the first pipe comprises an outlet from a heat exchanger coil.

9 . A method of connecting a larger diameter pipe to a smaller diameter pipe, comprising:
brazing the pipes together with a brazing alloy, the brazing connecting an outer surface of the smaller pipe to an inner surface of the larger pipe; and providing a flare, the flare extending from the larger pipe toward the smaller pipe and extending radially outward, wherein the flare extends a sufficient distance to shield the brazed joint from corrosion.

10 . The method of claim 9 further comprising placing a sealant between an inside surface of the flare and an outer surface of the smaller diameter pipe.

11 . The method of claim 9 wherein the larger diameter pipe comprises aluminum.

12 . The method of claim 9 wherein the smaller pipe comprises copper.

13 . In a brazed joint connecting an aluminum pipe of larger diameter to a copper pipe of smaller diameter wherein the aluminum pipe is vertically above the copper pipe, an improvement comprising: the aluminum pipe comprising a flare extending radially outward and toward the copper pipe, the flare extending a sufficient distance to shield the brazed joint from corrosion.

14 . The apparatus of claim 13 further comprising a plurality of flares.

15 . The apparatus of claim 13 wherein the flare extends radially outward and then radially inward.

16 . The apparatus of claim 13 wherein the aluminum pipe comprises an anodal treatment on its outer surface.

17 . The apparatus of claim 13 further comprising a sealant between the inside surface of the flare and the outer surface of the copper pipe.

18 . The apparatus of claim 13 wherein the aluminum pipe comprises a heat exchanger coil and the copper pipe comprises an inlet to the heat exchanger coil.

19 . The apparatus of claim 16 wherein the aluminum pipe has been treated with zinc.

20 . The apparatus of claim 13 wherein the copper pipe comprises an outlet from a heat exchanger coil.

Assignees

• Lennox Ind Inc

Inventors

• Boyd Hermon Alan

Classifications

• B23P15/26

  heat exchangers {or the like (making heat exchangers by methods covered by other subclasses B21D53/02)} · CPC title

• F28F9/0256 Primary

  Arrangements for coupling connectors with flow lines · CPC title

• B23K2101/14

  Heat exchangers · CPC title

• F28F2275/04

  by brazing · CPC title

• B23K1/0012

  Brazing of heat exchangers · CPC title