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Publication numberUS2434519 A
Publication typeGrant
Publication dateJan 13, 1948
Filing dateApr 18, 1942
Priority dateApr 18, 1942
Publication numberUS 2434519 A, US 2434519A, US-A-2434519, US2434519 A, US2434519A
InventorsRaskin Walter
Original AssigneeRaskin Walter
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Heat exchange conduit with a spiral fin having a capillary groove
US 2434519 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Jan. 13, 1948. w. RASKIN 2,434,519

HEAT EXCHANGE CONDUIT WITH A SPIRAL FIN HAVING A CAPILLARY GROOVE Filed April 18, 1942 INVENTOR. VWJL TEe PAS/(ml BY J/Z Q A T TOR/V673 frigerating Patented Jan. 13, 1948 2,434,519 HEAT EXCHANGE CONDUIT WITH A SPIRAL FIN HAVING A CAPILLARY GROOVE Walter Raskin, New York, N. Y. Application April 18, 1942, Serial No. 439,471 1 Claim. (01. 257-262) This invention relates to a heat exchange device or heat absorption device and to a refrigerant tube used equipment. 4

One of the principal objects of the invention is to increase the heat exchange surface or' the evaporator surface to a maximum.

Another object is to utilize the capillary attraction principle in moistening the evaporator surfaces with the refrigerant.

Still a further object is to increase the turbulence of the refrigerant through the evaporator conduit without loss of energy and without appreciable friction increase.

Still a further object is to provide a heat exchange device or an evaporator conduit with added primary heat exchange or evaporator surfaces.

Other objects and advantages inherent in the invention will become apparent from the following description taken in conjunction with the attached drawing which illustrates, by way of example, various embodiments of the invention.

In the drawing:

Figure 1 is a perspective view of one embodiment of the invention; a

Figure 2 is a fragmentary top plan view of the device shown in Figure l drawn to a somewhat enlarged scale;

Figure 3 is a bodiment;

Figure 4 is a front elevation of a modification;

Figure 5 is a section taken along the line 5-5 of Figure 4;

Figure 6 is a cross-section of another modification; and,

Figure 7 is a cross-sectional view of still another modification.

Throughout the drawing the same reference characters are used to designate the same or analogous parts.

Referring in greater detail to the drawing, the device comprises. a closed tubular portion l0 formed of sheet metal or similar material.

In the modification shown in Figure l, the ends of the sheet defining the tubular portion are bent and pinched together and welded to form a flange or fin l2. The ends are bent outwardly again perspective view of another emin opposite directions to provide lateral extensions, as shown in Figure 1. These lateral extensions are preferably slit to form a series of blades i3 which are turned or twisted in the manner of air foil sections. This arrangement produces turbulence of the air passing over the blades and thus it is brought into more intimate contact with the evaporator surfaces.

In the embodiments shown in Figure 3, the wall of the tubular portion is extruded to form a plurality of fins M. The walls of the fins are spaced to define an intermediate slot l5 which opens into the tube. Thus the fins l4 become part of the primary evaporator surface when the tube is flooded with the refrigerating medium.

However, if the width of the slots I5 is too large, little or no refrigerant will penetrate into the fin, except by forced fiow. Such forced flow will cause a friction drop and require considerably more energy and will thus increase the load upon the operating machinery and decrease the emciency of the device generally.

This objection has been overcome by the invention by making the width of the flow of such dimension that the refrigerant will penetrate into the slot through capillary attraction. It will be understood that a mere wetting or moistening of the interior surfaces of the slot will suffice to cause heat absorption.

In the modification illustrated in Figure 4, the turbulence of the refrigerant is increased by arranging the fins "5 in a spiral or helical fashion about the evaporator tube Ill. The fin I6 is provided with a slot I! in a manner similar to the embodiment shown in Figure 3. The spiral periphery has a relatively great pitch. In addition to the increased turbulence resulting from this construction, which feature is a very important factor in refrigerating equipment, the spiral will also have the effect of a sharply inclined plane of great mechanical advantage. By virtue of this construction, the refrigerant will be brought to the top of the slot and complete wetting of the inner surfaces of the tube as well as of the fins will be assured. This will prevent partial starvation of the tube as well as of the fins.

It will be understood that the invention is not limited to any particular number of fins. The evaporator tube, according to the invention, may have two fins, as shown in Figures 4 and 5, or as shown in the modification illustrated in Figure 7,

or it may have four fins, as shown in Figure 6, or

a greater number, as demonstrated in Figure 3.

It will also be understoodthat the foregoing description is given by way of example only and not byway of limitation. The invention may find expression in a great variety of other modifications within the scope of the following claim.

What is claimed is:

A heat exchange device comprising a tubular portion, a fin portion extending spirally about said tubular portion, said fin portion having a longitudinal slot opening along said conduit, whereby said fin portion will become part of the primary evaporator surface, the width of said slot being of such dimension that capillary attraction will 5 cause the refrigerant to penetrate into said slot. WALTER RASKIN.

REFERENCES CITED The following references are of record in the 10 file of this patent:

Number UNITED STATES PATENTS Name Date Murray June 4, 1929 Morrison Aug. 30, 1932 Heitman Apr. 9, 1935 Higham et a1 June 13, 1939 Gould May 6, 1941 Schoen Apr. 28, 1942 Brown June 23, 1942

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1715378 *May 1, 1924Jun 4, 1929Murray Thomas ERadiator
US1874578 *Apr 9, 1931Aug 30, 1932Sidney A MorrisonHeat exchange device
US1996808 *Oct 19, 1932Apr 9, 1935Kelvinator CorpRefrigerating apparatus
US2162083 *Feb 9, 1938Jun 13, 1939Universal Cooler CorpEvaporator
US2241086 *Jan 28, 1939May 6, 1941Gen Motors CorpRefrigerating apparatus
US2281206 *Jun 17, 1939Apr 28, 1942Bohn Aluminium & Brass CorpHeat exchange device
US2287492 *May 27, 1940Jun 23, 1942Brown Harry A BRefrigerating system
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2646972 *Feb 4, 1950Jul 28, 1953Knapp Monarch CoFin type radiator
US2691281 *Jan 16, 1951Oct 12, 1954Servel IncHeat and material transfer apparatus
US2775433 *Aug 31, 1953Dec 25, 1956Matheny William FFinned tube spacing supports
US2904665 *Jun 18, 1957Sep 15, 1959Applied Radiation CorpVacuum trap
US3041262 *Nov 13, 1956Jun 26, 1962United Nuclear CorpReactor fuel element
US3096264 *Dec 7, 1959Jul 2, 1963Rolls RoyceMethod of producing canned fuel rods for nuclear reactors
US3179570 *Aug 1, 1960Apr 20, 1965Commissariat Energie AtomiqueThermal exchange of the fuel elements in nuclear reactor
US3251410 *Jan 8, 1965May 17, 1966Dean Products IncHeat exchange devices
US3370156 *Mar 29, 1965Feb 20, 1968H W Tuttle & CompanyContact heater construction
US3416600 *Jan 23, 1967Dec 17, 1968Whirlpool CoHeat exchanger having twisted multiple passage tubes
US4003364 *Feb 26, 1975Jan 18, 1977Balkus Jr Carl ESolar heating system
US4214573 *Jul 18, 1978Jul 29, 1980Niedermeyer William PSolar energy collector
US4223094 *Aug 29, 1977Sep 16, 1980Vaseen V AHorizontal rotating drum fermentor
US5403281 *Sep 25, 1992Apr 4, 1995Minnesota Mining And Manufacturing CompanyInline heat exchanger and cardioplegia system
US6681764 *Jun 29, 1999Jan 27, 2004Sequal Technologies, Inc.Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator
US6698423 *Oct 19, 1999Mar 2, 2004Sequal Technologies, Inc.Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator
US20100314092 *Nov 28, 2008Dec 16, 2010Bundy Refreigeration GmbHHeat transfer tube
USRE43398 *Mar 1, 2006May 22, 2012Respironics, Inc.Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator
DE954696C *May 3, 1951Dec 20, 1956Electrolux AbAbsorptionskaelteapparat
EP0005704A1 *Sep 19, 1978Dec 12, 1979Maurice GravierApparatus for producing hot water or hot air
EP2138702A1 *Jun 25, 2008Dec 30, 2009Magneti Marelli Powertrain S.p.A.Intake system for internal combustion engines
U.S. Classification165/110, 62/524, 165/184, 165/183, 165/177, D25/164, 165/DIG.183
International ClassificationF28F1/06
Cooperative ClassificationF28F1/06, F28F1/16, Y10S165/183
European ClassificationF28F1/06, F28F1/16