Aspects of the present invention are directed to an automatic fluxing machine to apply flux to rings used in brazing round tube plate fin (RTPF) heat exchanger coils in, for example, heating, ventilation, air conditioning and refrigeration products.
Currently, commercially available braze rings for automatic brazing of RTPF heat exchanger coils are made of Al-Zn or Al-Si filler material. Some are solid rings, some others pre-fluxed. Tests have shown that none of them performs as well as an Al-Zn-Si ring when a correct amount of flux is applied to the joint. Manual fluxing can ensure the correct amount of flux is applied. With high through-put assemblies, however, manual fluxing cannot keep up with capacity demands.
An automatic fluxing machine is provided and includes a dispensing section including a surface having through holes formed therein through which flux material is dispensable toward a braze joint and a plugging section disposed below the braze joint to prevent downward flow of dispensed flux material.
An automatic fluxing machine for use with an aluminum round tube fin coil with a flange extending above the tube is provided and includes a dispensing section including a surface having through holes formed therein through which flux material is dispensable toward a braze joint at the flange and a plugging section disposed below the braze joint to prevent downward flow of dispensed flux material into the tube.
A method of operating an automatic fluxing machine with an aluminum round tube fin coil with a flange extending above the tube is provided and includes providing the automatic fluxing machine with a dispensing section and a plugging section, inserting the automatic fluxing machine into the round tube fin coil such that the dispensing section is disposed at the flange and the plugging section plugs into the tube, dispensing flux material out of the dispensing section into the flange and preventing flow of the flux material into the tube and removing the automatic fluxing machine from the round tube fin coil.
The subject matter which is regarded as the invention is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
In accordance with aspects of the invention, an automated flux application method and apparatus for return bends and/or hairpins is provided as an automatic fluxing machine. The automatic fluxing machine controls amount of flux to be dispensed to a given braze joint in a repeatable, consistent way. The automatic fluxing machine is therefore capable of providing for high production rates.
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With reference to
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The dispensing section 20 and the plugging section 30 are coupled to one another at mutually complementary ends, which have similar diameters. In addition, a stop gap 25 may be disposed in the plugging section 30 at the complementary end thereof Thus, flux material supplied to the dispensing section can be prevented from leaking out of the dispensing section 20 and into the tube 12 by way of the plugging section 30, which may be, otherwise, empty or hollow.
With particular reference to
A method of operating the machine 10 is shown in the sequence of
While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
Number | Date | Country | |
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61524062 | Aug 2011 | US |