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Publication numberUS2365670 A
Publication typeGrant
Publication dateDec 26, 1944
Filing dateSep 12, 1942
Priority dateSep 12, 1942
Publication numberUS 2365670 A, US 2365670A, US-A-2365670, US2365670 A, US2365670A
InventorsWallace Edward H
Original AssigneeUs Rubber Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of making heat exchange tubes
US 2365670 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

Filed Sept. 12, 1942 INVENTOR. WV/7K0 66 W41 Z1462 ATTORNEY Patented Dec. 26, 1944 UNITED STATES PATENT OFFICE Edward E. Wallace, Detroit, Mich, asslgnor to United States Rubber Company, New York, N. Y., a corporation of New Jersey Application September '12. 1942, st ains; 458,096

which may be made of wax, metal which melts This invention relates to methods of making heat exchange tubes or conduits which have heat exchange projections on the inside of the tube. Tubes of this character are diflicult to produce in commercial quantities and as far as I am aware tubes having irregular shapes and inside projections or heat exchange elements havenot been made.

The primary object of the present invention is to provide an improved and economical method of making heat exchange conduits or tubes having numerous projections inside the tube which greatly increases the interior surface area so as to cause a high thermal transfer coefllcient to exist between the projections and their tubular container.

Another objectis to provide a method whereby a heat exchange tube having the above mentioned internal projections can be I readily formed of irregular contour.

Other objects and advantages of the present invention will be apparent from the following description and. the accompanying drawing, in

Fig. 1 is a perspective view of a heat exchange tube embodying the invention,

Fig. 2 is a perspective view of a core in an intermediate stage of the manufacture of the tube shown in Fig. 1, according to one method embodying the invention,

Fig. 3 is a longitudinal section of the core shown in Fig. 2 with a completed heat exchange tube formed on it,

Fig. 4 is a perspective view, partly broken away,

showing atube and core made by another methtact of high eiiectiveness. The wires are preferably embedded in the wall of the tube, providin: joints of great mechanical strength.

The invention includes methods of conveniently and economically making such atube. One such method is shown in Figs. 1 and 3. A large number of staples, each including a pair -of pins or filaments I! connected by a connecting end portion ll, are driven into a suitable core ll.

'ical connection.

at a relatively low temperature such as lead, or any other suitable substance which can readily be removed from the completed tube. Prefer- .ably the U-ends l4 project slightly from the electrolytically deposited metal forms an intimate contact with the connecting ends of the pins and adheres firmly to them. If the connecting ends of the pins are not in too close contact with the core, the electrolytically deposited metal forms about them' so that in the completed heat ex change tube the pins are embedded in the wall of the tube and integral withthe metal of the wall. This forms agood thermal and mechan- The filaments themselves, being embedded in the core receive no deposit of metal, and thus do not build up or increase in thickness. After the tube has been formed asdescribed the core is removed. In the case .of

metal or wax cores, this is done simply by melting out the core.

I Fig. 4 illustrates a tube made by another method involving the invention. Card cloth is first formed about any suitable core such as a paper tube 20 of streamlined cross-section. Card cloth i a commercially available article consisting of a fabric backing or support It through which are driven a large number of small staples 22 which provid a large number of closely spaced pins 23 projecting from one face of the fabric. The back of the fabric is then "coated with graphite and immersed in the electrolyte so that the tube 24 is. electrolytically deposited on the fabric and staples. If necessary theprojecting pins are coated with any suitable stop varnish to prevent their receiving a deposit of metal. It is important that the conducting support for the staples be immersed in the electrolyte, as opposed to merely dipping the ends of the staples into the electrolyte, in order that the electrolytically deposited tube may be built up on the conducting support and on the staples at the same time. This produces an intimate thermal and mechanical bond, and a tube which is strong mechanically and capable of withstanding high pressure.

After the tube 24 has been deposited to the desired thickness, the form 20 and backing 2| are removed by any suitable method, such as by burning or dissolving out, leaving the tube with the pins embedded in its wall and projecting from its interior surface.

Having thus described my invention, what I- claim and desire to protect by Letters Patent is: The method of making a heat exchange tube

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3261759 *Jun 27, 1963Jul 19, 1966Commissariat Energie AtomiqueFuel element for nuclear reactor
US3327779 *Dec 16, 1965Jun 27, 1967Hull Jacoby JohnHeat dissipating device and method
US3399444 *Oct 18, 1965Sep 3, 1968John H. JacobyMethod for making a heat dissipator
US3512250 *May 10, 1967May 19, 1970Horst H Lemet Chromium Van DerMethod for mutually connecting workpieces and workpieces mutually connected by said method
US4263966 *Jul 27, 1979Apr 28, 1981Oestbo John D BHeat-exchanger
US4383163 *Nov 10, 1980May 10, 1983Gotaverken Anteknik AbMethod of manufacturing a heat exchange tube with internal surface enlarging elements
US4624302 *Jul 2, 1984Nov 25, 1986At&T Technologies, Inc.Apparatus for preheating printed circuit boards
US4871623 *Feb 19, 1988Oct 3, 1989Minnesota Mining And Manufacturing CompanySheet-member containing a plurality of elongated enclosed electrodeposited channels and method
US5070606 *Oct 4, 1989Dec 10, 1991Minnesota Mining And Manufacturing CompanyMethod for producing a sheet member containing at least one enclosed channel
US5249358 *Apr 28, 1992Oct 5, 1993Minnesota Mining And Manufacturing CompanyJet impingment plate and method of making
US5317805 *Feb 17, 1993Jun 7, 1994Minnesota Mining And Manufacturing CompanyMethod of making microchanneled heat exchangers utilizing sacrificial cores
US6675746May 16, 2001Jan 13, 2004Advanced Mechanical Technology, Inc.Heat exchanger with internal pin elements
US8820224 *Apr 18, 2011Sep 2, 2014Cheese & Whey Systems, Inc.Food processing vat with heat exchangers
US20110252981 *Oct 20, 2011Isenberg Timothy JFood Processing Vat With Heat Exchangers
USRE34651 *May 29, 1990Jun 28, 1994Minnesota Mining And Manufacturing CompanySheet-member containing a plurality of elongated enclosed electrodeposited channels and method
U.S. Classification205/73, 29/890.46, 165/179, 165/185, 29/423
International ClassificationC25D1/00, C25D1/02
Cooperative ClassificationC25D1/02
European ClassificationC25D1/02