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Title: Aluminum heat exchanger

Abstract

This patent describes a heat exchanger comprising a flat metal tube for conducting fluid having opposite first and second ends, of metal fins fixed onto outer surfaces of the flat metal tube, first and second header pipes fixedly mounted on the opposite ends of the flat metal tube, respectively, so that the flat metal tube communicates with the interior of the header pipes. Each of the header pipes has a first end that is open and a second end that is closed. An inlet tube is connected to the first end of the first header pipe, and an outlet tube is connected to the first end of the second header pipe. The improvement described here comprises one of the inlet and outlet tubes having an end portion inserted into the first end of the corresponding interconnected header pipe. The end portion has a cut-away portion in the form of a first axial slit extending axially inwardly from an open end at the adjacent end of the one tube. The first axial slit has an axial intermediate portion slightly smaller than the thickness of the flat metal tube, and a tapered portion diverging towards the open end of the first axialmore » slit, and the first end of the flat metal tube extends into the corresponding interconnected header pipe and is closely fitted into the first axial slit.« less

Inventors:
;
Publication Date:
OSTI Identifier:
6992989
Patent Number(s):
US 4620590
Assignee:
Sanden Corp., Gunma NOV; NOV-85-032421; EDB-87-004444
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 5 Dec 1984
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; HEAT EXCHANGERS; DESIGN; MATERIALS; ALUMINIUM; FLUID FLOW; PIPES; ELEMENTS; METALS; 421000* - Engineering- Combustion Systems

Citation Formats

Koisuka, M., and Aoki, H. Aluminum heat exchanger. United States: N. p., 1986. Web.
Koisuka, M., & Aoki, H. Aluminum heat exchanger. United States.
Koisuka, M., and Aoki, H. 1986. "Aluminum heat exchanger". United States. doi:.
@article{osti_6992989,
title = {Aluminum heat exchanger},
author = {Koisuka, M. and Aoki, H.},
abstractNote = {This patent describes a heat exchanger comprising a flat metal tube for conducting fluid having opposite first and second ends, of metal fins fixed onto outer surfaces of the flat metal tube, first and second header pipes fixedly mounted on the opposite ends of the flat metal tube, respectively, so that the flat metal tube communicates with the interior of the header pipes. Each of the header pipes has a first end that is open and a second end that is closed. An inlet tube is connected to the first end of the first header pipe, and an outlet tube is connected to the first end of the second header pipe. The improvement described here comprises one of the inlet and outlet tubes having an end portion inserted into the first end of the corresponding interconnected header pipe. The end portion has a cut-away portion in the form of a first axial slit extending axially inwardly from an open end at the adjacent end of the one tube. The first axial slit has an axial intermediate portion slightly smaller than the thickness of the flat metal tube, and a tapered portion diverging towards the open end of the first axial slit, and the first end of the flat metal tube extends into the corresponding interconnected header pipe and is closely fitted into the first axial slit.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1986,
month =
}
  • Process for preparing an aluminum alloy fin material for heat exchangers is described comprising casting an alloy consisting essentially of 0.4 to 1.0% by weight of silicon, 0.45 to 3.0% by weight of iron, 0.01 to 0.3% by weight of zirconium, at least one member of the group consisting of 0.2 to 2.0% by weight of zinc, 0.01 to 0.1% by weight of tin and 0.01 to 0.1% by weight of indium, and the balance being of aluminum and unavoidable impurities; heat treating said cast alloy at 450 C to 600 C for a time sufficient to provide homogenization ofmore » said cast alloy; hot rolling and cold rolling said heat treated alloy with at least one intermediate annealing; and following the final intermediate annealing, cold rolling at a cold roll ratio of 15 to 60% to obtain a final sheet thickness.« less
  • A method is given for manufacturing a long heat exchanger tube with inner and outer walls. The method comprises staggering short lengths of inner and outer tubes so that butt welding of two inner tube ends can be done first, followed by butt welding of the outer tube ends, and subjecting the inner tubes to internal fluid pressure to expand them against the outer tubes. Leak detection means are described. (D.L.C.)
  • This patent describes a tube bundle heat exchanger which includes a multiplicity of open ended heat exchanger tubes and where products of corrosion, oxidation, sedimentation and comparable chemical reactions adhere to the internal wall of the respective heat exchanger tubes. The heat exchanger is further characterized by a chamber which extends into one end of a group of open ends of the multiplicity of heat exchanger tubes. The method is described of removing the products of corrosion, oxidation, sedimentation and comparable chemical reactions which adhere to the internal wall of the respective heat exchanger tubes comprising: a. placing at leastmore » one air-gun type pressure pulse shock wave source into the chamber such that the shock wave producing elements of the at least one air-gun type pressure pulse shock wave source face the open ends of the heat exchanger tubes which go into the chamber; b. filling the heat exchanger tubes with a liquid; and c. activating the at least one air-gun type pressure pulse shock wave source to generate a repetitive series of explosive transient shock waves into the liquid within the heat exchanger tubes and from the liquid against the internal walls and against the adhered products of corrosion, oxidation, sedimentation and comparable chemical reactions.« less
  • nment of the flow passages with the A heat exchanger assembly is disclosed for use with concentrating solar collectors of the type employing an elongated conduit for transporting a heat exchange fluid, the heat exchanger being positioned within an opening in the upper surface of the conduit and operating to transfer heat to the heat exchange fluid. The heat exchanger includes a plurality of stacked heat conducting heat exchanger plates having grooves oriented to form flow passage extending in the direction of fluid flow. The heat direction of heat exchange fluid flow. The grooved heat exchange plates may be fabricatedmore » by stamp from a sheet of heat conducting material to facilitate manufacturing of the heat exchanger. In another embodiment, the plates are positioned normal to the fluid flow direction with openings in the plates serving to form flow channels. The heat exchanger is usuable with collectors employing either photovoltaic cells or a solar radiation absorbing flat plate collector.« less
  • In combination, a heat exchanger core is described having reinforcements extending along opposite sides and headers at opposite ends, a detachable clip for separately fixturing each of the reinforcements to one of the headers during brazing of the core and the reinforcements to the headers at junctures. The reinforcements may be assembled prior to brazing with substantial air space at their junctures with the headers but not exceeding a prescribed limit, characterized by the clip being made of a material having a coefficient of thermal expansion substantially less than the reinforcements so as to draw the reinforcements and headers togethermore » during brazing through a distance at least equal to the prescribed air space limit to thereby assure contact at all the junctures between the reinforcements and headers during the brazing thereof.« less