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Патент USA US3068915

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Dec. 18, 1962
J. H. T. MILLINGTON i-z'rm.
3,068,905
EXTENDED SURFACE mus FOR HEAT nxcmmcz TUBES
Filed March 28,’ 1960
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Dec. 18, 1962
J. H. T. MILLINGTON ETAL
3,068,905
EXTENDED SURFACE FINS FOR HEAT EXCHANGE TUBES
Filed March 28, 1960
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Dec. 18, 1962
.|. H. T. MILLINGTON ETAL
3,068,905
EXTENDED SURFACE FINS FOR HEAT EXCHANGE TUBES _
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Filed March 28, 1960
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United States Patent ()?ice
1
3,068,905.
Patented Dec. 18, 1962
2 .
the circle 13. The cup bottom portion within the circle
13 is then removed although this may be done before the
3,068,905
EXTENDED SURFACE FINS FOR HEAT
remainder of the cup bottom is slitted.
EXCHANGE TUBES
The cup bottom portions at the slits are then bent
John H. T. Millington, Pittsburgh, and Samuel Fein,
along radial lines 16 of FIG. 2, radially inwardly to form
Irwin, Pa., assignors to Westinghouse Electric Corpo
radially extending, inner ?ns 17 of FIG. 3, the remainder
ration, East Pittsburgh, Pa., a corporation of Pennsyl
of the cup bottom portions 18 remaining as shown by
vania
FIG. 3.
Filed Mar. 28, 1960, Ser. No. 17,995
Next, the cup bottom portions 18 are bent along pe
2 Claims. (Cl. 138-38)
10 ripheral lines 19 of IFIG. 3 to form substantially cylindri
cal segments 20 of FIG. 4. This moves the ?ns 17 on
This invention relates to heat-exchange tubes having
the cup bottom portions 18 outwardly as shown by FIG.
internal and external, extended surface ?ns.
5. The ?ange now has at its outer end, spaced-apart,
It has been proposed as disclosed in the US. Patents
circular, peripheral portions, with portions 20 between its
Nos. 1,718,361; 1,810,215; 2,065,515 and 2,212,242 to
form an externally-?nned, heat-exchange tube by provid 15 circular portions, extending outwardly beyond the cup
bottom, and having radially extending ?ns 17.
ing tapered ?anges, circular in section, on ?ns, and to
The ?ns are then assembled as shown by FIG. 5, with
place the small end of the tapered ?ange on each ?n into
the large end of the tapered ?ange on an adjacent ?n, the
contacting ?anges then being joined as by brazing.
This invent-ion adds to an externally-?nned tube so
constructed, internal ?ns. ‘In one embodiment of this in
vention, this is accomplished by ‘forming the tapered
?anges as cups, the bottoms of which have central, circu
lar portions removed, the remaining bottom portions be
the outer ends of tapered ?anges 11 inserted within the
C inner ends of adjacent ?anges 11, and forced together to
20 ?t snugly. An outer ?ange 11 at one end of a formed
tube has a pipe section 22 with a tapered inner end 23
?tted in the outer ?ange at that tube end as shown by
FIG. 5.
The. tapered end 23 of the pipe section 22 is then
ing slit ‘and then bent to form internal ?ns. The external 25 brazed or otherwise suitably secured to the outer ?ange
11 at that tube end, and the inner ?anges 11 are likewise
and internal ?ns increase heat transfer, and enable the
attached to each other for forming a leak proof tube with
~ sizes of heat-exchange coils to be greatly reduced.
good heat exchange contact at its joints, the tube having
While heat-exchange tubes having both external and
external ?ns '10 and internal ?ns 17.
internal ?ns have previously been proposed, the internal
It may be desired to generate turbulence in the ?uid
?ns have been formed by grooving the inner surfaces of 30
?owing through such a tube as for removing insulating
the tubes, or by placing separately formed ?ns within the
?lms of ?uid from inner ?ns. This can be accomplished
hollow tubes. This invention greatly reduces the cost of
by causing the lines 16 of FIG. 2 to depart from radial
manufacturing internally-?nned tubes.
An object of this invention is to increase the heat trans
fer of a heat-exchange tube.
‘
Another object of this invention is to reduce the cost
of manufacturing internally-?nned, heat-exchange tubes.
Another object of
invention is to reduce the sizes
of heat-exchange tubes.
lines, or, ‘as shown by FIG. 6, the inner ?ns 17 which
extend radially on FIGS. 4 and 5, may have portions 24
bent away from the remaining radial portions. FIG. 7
shows a tube assembly having internal ?ns with the non
radial portions 24 of FIG. 6.
FIG. 8 shows an assembled heat exchanger using the
This invention will now be described with reference to 40 tubes of either FIG. 5 or FIG. 7. A pipe 25 at one end
of the heat exchanger forms a ?uid outlet. A pipe 26
,
at the other end of the heat exchanger forms a ?uid inlet,
FIG. 1 is a projected view of a ?n having a tapered
and return bends 27 at both ends of the heat exchanger
?ange formed as a cup ‘according to this invention;
connect adjacent tubes as is conventional.
FIG. 2 is an enlarged, ‘fractional, top plan view of the
?n of FIG. 1, showing a central, circular portion re 45
What is claimed, is:
1. A heat exchange tube comprising a generally cup
moved trom the bottom of the cup, and showing the re
shaped flange having a circular open top and having a
mainder of the bottom of the cup as being slit prepara
the annexed drawings, of which:
circular bottom concentric with said top, said ?ange hav
tory to forming internal ?ns;
ing extending outwardly beyond said bottom, a plurality
FIG. 3 is a view similar to FIG. 2 except that the slit
50 of spaced-apart portions formed substantially as segments
portions are bent inwardly along radial lines;
.
FIG. 4 is a View similar to FIG. 3 except that periph
of -a cylinder concentric with said ?ange and forming ex
eral portions of the cup bottom are bent outwardly so
tensions of said ?ange, said bottom having between said
as to bring the radially bent portions outwardly;
portions peripheral edges only, said spaced-apart portions
FIG. 5 is a fragmentary side view, partially in section,
having inner ?n portions extending radially therefrom
55
of a heat exchange tube formed from the ?ns of FIG. 4;
towards the axis of said ?ange, whereby said bottom ex
FIG. 6 is a view similar to FIG. 4 except that the
cept for said inner ?n portions is open.
radially extending, inner ?ns have outer port-ions turned
2. A heat exchange tube as claimed in claim 1 in which
out of radial lines;
,
said inner ?n portions have portions extending at angles
FIG. 7 is a fragmentary side view, partially in section,
of a heat exchange tube formed from the ?ns of FIG. 60 to radial lines.
6, and
References Cited in the ?le of this patent
FIG. 8 is a projected view of a heat exchanger formed
UNITED STATES PATENTS
from the tubes of FIG. 5 or 7.
At the start of the tube ‘forming operation, the neces
1,689,446
Miller et al. __________ .. Oct. 30, 1928
sary number of ?at, sheet metal, ?n blanks are out from 65 1,705,572
K-armazin ___________ __ Mar. 19, 1929
stock, and then formed, ‘as by drawing, each to have a
1,880,533
Thomas ______________ .._ Oct. 4, 1932
tapered ?ange 11 formed as a cup having a circular bot
tom 12 at the center of a ?at outer portion forming an
external ?n 10 as shown by FIG. 1.
Next, as shown by FIG. 2, each cup bottom 12 around 70
a concentric circle 13, is slitted along equally spaced
lapart lines 14 which depart about 30° from tangents to
2,153,806
2,196,707
2,291,985
2,646,972
Karmazin ____________ __ Apr. 11,
Nelson et a1. __________ .._ Apr. 9,
Powers ______________ __ Aug. 4,
Schmid ______________ __ July 28,
1939
1940
1942
1953
2,717,320
Shoulders et a1 _________ _- Sept. 6, 1955
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