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Патент USA US3022019

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Feb. 20, 1962
Filed July 10. 1959
United States Patent-“O
PatentedpFeb. 20, 1962
strip‘ 5 of sheet stock. In the villustrated embodiment
Roy W. Abbott, Je?'ersontown, Ky., assignor to General
Electric Company, a corporation of New York
Filed July 10, 1959, Ser. No. 826,241
2 Claims. (Cl. 257—262.13)
' of the invention, there are shown three folds 6, 7 and 3
in the tube forming ?ange, but it should be noted that
any number of folds could be provided as long as there
are at least two. The folds 6, 7 and 8 interlock to pre
vent axial movement of the adjacent wraps with respect
to each- other and cooperate to provide a very strong
tubular structure. More speci?cally, the ?rst fold 6, or
The present invention relates to and has for its prin
fold closest to the ?n section 3a, of each wrap ?ts within
cipal object a new and improved heat exchange tubing
having a tubing Wall structure and ?n portion formed 10 the fold 7, or second fold, of the next preceding wrap.
The ?rst fold 6 is made smaller than the second fold 7
integrally of the one and the same strip of material.
in carrying out the present invention there is provided ‘ and is easily seated within the fold 7. In a similar man
ner, the second fold 7 of each wrap ?ts within the third
tubing formed from a thin strip of sheet stock which has
fold 8 of the preceding wrap. The second fold 7 is, like
been preformed along its length into a tube forming
?ange and an angularly disposed longitudinal ?n portion. 15 wise, made smaller than the fold 8 so that it ?ts snugly
within the fold 8 when the tubing is fabricated.
The ?n portion is transversely slit from its outer edge
Still referring to FIG. 2, it can be seen that the folds
toward the tube forming ?ange into a plurality of angular
6, 7 and 8 are spaced apart an equal distance from each
ly disposed slender ?n sections and the tube forming
other. That is, the apexes 9 of the separate folds or
?ange is provided with a plurality of longitudinal folds
spaced apart an equal distance from each other and ar 20 corrugations are all spaced apart an equal distance “x”
from each other in order to cause the folds to interlock’
ranged parallel to the length of the ?ange. The strip
or ?t within one another. In addition, the distance “x,”
is helically wound with successive laps or wraps of the
which is the distance between adjacent folds, must neces
tube forming ?ange overlapping and with the angularly
sarily be equal to the pitch between adjacent wraps and
disposed ?n sections extending outwardly around the
outer periphery thereof. The folds of the tube form 25 therefore determines the helical wrapping angle of the
strip 5. In other words, the tubing must be formed by
ing ?ange are so arranged that they nest or interlock to
helically wrapping the strip 5 of sheet stock so that the
prevent axial movement of the overlapping portions of
pitch between adjacent wraps is equal to the distance
the ?ange. In order to seal the tubing and to secure
“x” between the folds in the tube forming ?ange 4-.
the adjacent wraps of the tube forming ?ange together
a bonding material is provided between the overlapping 30 ' A bonding material 11, such as a brazing material or
an adhesive bonding agent, holds the adjacent wraps of
portions of the ?anges.
the tubing together and seals the air spaces between the
For a better understanding of the invention,.reference
may be had to the accompanying drawing in which:
wraps to provide a sealed tubing capable of conducting
a highly pressurized fluid medium. The bonding ma
FIG. 1 is an elevation view illustrating the helical ?n
35 terial 11 entirely ?lls the spaces formed in the folds
and tube arranged of the present invention;
between adjacent wraps of ‘the strip of sheet stock and
FIG. 2 is a partial cross-sectional view taken along
creats a gas tight bond between the overlapping por
line 2—2 of FIG. 1;. and
tions of the tube forming ?ange 4. The interlocking ac
FIG. 3 is a partial cross-sectional view of the tubing
tion of the folds enhances the seal beween the adjacent
taken along line 3-—3 of FIG. 1.
Referring now to the drawing, there is shown a tubular 40 wraps of the tubing by literally squeezing the bonding
agent between the mating folds and causing it to spread
structure adapted for heat exchange purposes such as
into all spaces between the overlapping portions of the
for use in air conditioning apparatus or in refrigerating
tube forming ?ange 4.
equipment. As shown in‘FlGS. l and 3, the structure
The present invention provides a ?nned tubular struc
comprises a base surface or tubing 2, which carries the
ture in which the tubing itself and the ?n section comprise
cooling medium, and a secondary surface in the form of
a single, integral piece. The structure requires no bond
a plurality of slender ?n sections 3, which radiate out
ing or soldering agent to connect the ?n surfaces or sec
wardly from the tubing. As is clearly shown in the
tions to the tubing and thereby eliminates the barrier to the
cross-sectional view of FIG. 2, the ?n sections and the
?ow of heat from the tubing to the outwardly extending
tubing are formed of one and the same strip of material.
More speci?cally, the structure comprises a continuous 50 ?n surfaces which inherently occurs in those types of heat
exchange structures in which the ?n surfaces must be at
strip 5 of sheet stock that is folded or formed into a
tached to the tubing. For example, when heat is taken or
tube forming ?ange 4 and an angularly disposed ?n
removed from any suitable source, such as an air stream
portion 3a. For ease of description the strip 5 of sheet
which is passed through the ?n section 3, it is transferred
stock is shown in the drawings to be much thicker than
would ordinarily be used for tubing provided for use 55 directly from the ?n to the wall or tube forming ?ange
of the tubing. Since the bonding agent 11 is not in the
direct heat ?ow path from the fin section 3 to the tubing,
it does not present a barrier to the ?ow of heat through
ing a high degree of ductility such as aluminum, copper
the structure. In addition, because of the construction
or steel. The ?n portion 3a of the strip 5 is serrated
from its outer edge toward its junction point with the 60 of the tubing, the inner wall surface contains a helical
ridge or corrugation which promotes a highly turbulent
?ange 4 to provide the individual ?n sections 3 which
in refrigerant carrying apparatus. It is contemplated that
the sheet stock be relatively thin and of a material hav
spread apart at their outer edges, as is best seen in FIG.
?ow in the ?uid medium ?owing through the tubing. The
refrigerant or heat exchange medium is forced to rotate
3, when the strip 5 is helically wrapped into a tubular
as it ?ows through the tubing and the rotation imparted
In order to form the tubing, the strip 5 is spirally or 65 to the heat exchange medium by the helical folds greatly
enhances the heat exchange characteristics of the tubing,
helically wound upon itself with the tube forming ?ange
especially, when it is used as an evaporator. For ex
4 of succeeding wraps overlapping portions of the tube
ample, when cold liquid and gaseous refrigerant is passed
forming ?ange of preceding wraps. The tube forming
?ange 4 is provided with a plurality of spaced-apart lon 70 through tubing, the centrifugal force created by the
swirling or rotating refrigerant forces the heavier liquid
gitudinal folds or corrugations which are arranged paral
refrigerant toward the walls of the tubing thereby “wet
lel to the length of the ?ange 4 and to the length of the
' 3,022,049
ting” the walls entirely around the periphery'thereof.
By forcing the colder liquid refrigerant into contact with
all of the inner wall, surface of the tubing, the heat trans-_ '
fer through the tubing is greatly improved.
_ a v
wraps of said tube forming ?ange in the folds thereof for
securing adjacent wraps of said tube forming ?ange to
gether, and for sealing the space between adjacent wraps
of said ?anges so that a sealed tubular structure is pro
A further feature which increases the heat transfer
characteristics of the tubing of the present invention is the
greatly increased inner surface area available for transfer
of heat to and from the heat exchange medium ?owing
vided having integrally formed with the wall structure
thereof a plurality of ?n sections. extending radially out-_
ward‘ therefrom. '
2. A ?nned tubular structure adapted for heat exchange
purposes comprising? a thin strip of sheet. stock‘ folded
' through the tubing. Because of the corrugationsrorrfold
ed con?guration a greatly increased surface area is avail
able for heat transfer purposes as compared to the normal
along its length'into a tube forming ?ange'fand an an
gularly disposed longitudinal ?n. portion, saidzlongitudinal
type of heat exchange tubing having a comparatively ?at
' been shown what at present is believed to be the preferred,
portion being serrated from its outer edge toward said.
tube forming ?ange into. a plurality of slender ?n sections,
said tube forming ?ange having a ?rst_fold,.disposedthere
in parallel to the length of said strip and second'and third
embodiment of the invention, it will be obvious to those
folds disposed parallel to said ?rst fold between said ?rst
l or smooth inner wall surface.
While in, accordance with the patent statutes there has
skilled in the art that various changes and modi?cations ,
fold and the edge [of said ?ange, all of said’folds being
'may' be made therein without departing vfrom the inven
tion and it is, therefore, the aim of the appended claims ‘
to cover all such changes and modi?cations as fallarwithin' 20'
the true spirit and scope of the invention.
spaced, equal distances apart and increasing invsize from
saidl?rst to said third fold respectively, said, tube forming
?ange. spirally wound into a tubular structure with the
?nned‘ sections extending outwardly therefrom, said ?rst
What I claim asrnew and desire to secure byirLetters; 1 and second folds on said ?ange. of subsequent windings
Patent of the United States is:
:7 ?tting into the second and third folds on said ?ange of
1. A ?nned tubular structure adapted for heat exchange
preceding windings, said folds extending inwardly intosaid
purposes comprising a thin strip of sheet stock folded 25 tubular structure, and adhesive bonding,’ means between
along its length into a tube forming ?ange and an angu
overlapping portions of said tube forming ?ange in said.
lariy disposed longitudinal ?n portion, said longitudinal '
‘folds thereof for securing overlapping portions of said
?n portion being serrated from its outer edge toward said
tube forming ?ange together and sealing the spac'ebetween
' tube forming ?ange into a plurality of, slender ?n sections,_ '
said overlapping portions of said tube- forming ?ange so
said tube forming ?ange having a plurality 0E equally
spaced apart folds formed longitudinally therein'and are
ranged parallel to the length of said strip, said fold closest
to said ?n portion being smallest in size with said remain
ing folds progressively increasing in size, said- tube forming
that a sealed tubular structure is provided having integrally
formed with the wall structure thereof a plurality of ?n
sections. extending radially ‘outward therefrom.
References Cited in the ?leof this patent
?ange spirally wound“ into a tubular structure with sub
sequent wraps overlapping preceding wraps thereofysaid
folds on said ?ange extending inwardly and, said folds’ of
said ?ange of subsequent Wraps ?tting into inwardly ex:
tending folds on said ?ange of preceding, wraps, said ?n
sections extending radially outwardly from said tubular
structure,‘ and adhesive bonding means ‘between adjacent
Kramer _____- ________ __'_ Nov; s; 1929
Kai'mazin- ____ _.'. _______ ...1 July 2, '1940
Great Britain ________ __ May I4, 1925
Germany ____ ____ _...V___-_, Dec. 1'1,v 1952
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