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Патент USA US2044952

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June 23, 1936.
Filed Aug. 11, 1954
Patented June 23, 1936
Frank A. Neveu, Los Angeles, Calif.
Application August 11, 1934, Serial No. 739,453
5 Claims.
The present invention relates to new and use
ful improvements in heat transfer devices, and
more particularly to that type of radiators which
are adapted for use in connection with the cool
5 ing systems of automobile engines or other power
, An object of my invention is to provide an
arrangement effecting an increased expanse of
radiating surface of the radiating ?ns of which a
10 radiator is partially composed, whereby to increase the cooling ef?ciency of the radiator.
It is a further object in this connection to pro
vide such increased radiating surface of the
radiating ?ns without obstructing the air spaces
15 between the passageway-forming tube members,
and thereby permit free passage of air through
the radiator.
Another object of the present invention is to
provide a radiating ?n having increased radiat
ing surface as referred to hereinabove, without,
however, requiring additional material-in fact,
considerably less material is required in a radi
ator of given size and/or cooling capacity, and
consequently the cost of manufacture and weight
25 of the ?nished radiator is reduced by incorporat
ing the principles of my present invention
Yet another object is to provide a radiator ?n
of novel design, one of the advantages of which
30 is that-a radiator core embodying it need not be
dipped in molten solder, as is now usually done,
but instead is subject to being assembled by the
“baking”. process to insure soldering of the sev-.
eral ?ns to their associated tube members,
35 thereby effecting a great reduction in the amount
portion of a modi?ed form of ‘?n, also intended
for use in a radiator of the “cellular” type.
Figure 3 is, a fragmentary, perspective view
showing the radiating ?n of the present inven
tion adapted for use in the “tubular” type of
radiator. Portions of the ?gure illustrating the
front of the radiator are broken away the better
to show the interior construction.
In terms of broad inclusion, my present in
vention contemplates the use of metal fabric, or 10
wire mesh, as the material used in the construc
tion of radiating ?ns for a radiator, instead of
the sheet metal commonly employed for this
More speci?cally described, the improved radi- 15
ator ?n of the present invention comprises a
sheet of wire fabric, preferably copper screen
of suitable size of mesh, and composed of screen
wire of suitable gauge and preferably round in
cross section. The wire fabric is cut to proper 20
size and bent to proper shape to meet the re
quirements of the radiator ?n. This improved
form of ?n is adaptable for use in either the
“cellular” type or the “tubular” type of radiator,
and is susceptible to being formed into any size 25
and/or shape of ?n in order to meet the require
ments of any particular installation.‘ Wire
screen is available commercially in sheet form,
and, on account of the smaller amount of metal
necessary to form a sheet of given size, is con- 30
siderably less expensive than sheet copper,‘ which
‘is the material now commonly employed in the
manufacture of radiator ?ns. Of more import
ance, however, is the superiority of a radiator
?n made of wire mesh from the standpoint of 35 ,
of solder required in the construction of a core. . heat-radiating e?iciency as compared with a
The invention possesses other objects and ad
more conventional sheet metal ?n.
vantageous features, some of which, with the
foregoing, will be set forth in the following de
scription of the embodiments of my invention
which are illustrated in the drawing ‘accompany
ing and forming a part of the speci?cation. It
is understood that I do not limit myself to the
45 showing made by the said drawing and descrip
tion, as I may adopt variations of the described
forms within the scope of my invention‘ as": set
forth in the claims.
Referring to the drawing:
Figure 1 is a fragmentary view in perspective
showing a portion of a radiator core of ‘the
“honey-comb’? or “cellular’? type, having incor
porated therein a ?n embodying the principles
‘of the present invention.
Figure 2 is a perspective view showing a small
This increase in e?iciency is due to the large
number of foramina de?ned by the interwoven
wires of metal fabric such as copper screen, inas~ 40
much as their presence insures much more inti
mate contact of the air ?owing through the air
passages between the tube members of a radia
tor core with the metal of the ?n.
It .is common practice in making ?ns from ‘15
sheet metal to deform the sheet with a large
number of protrusions, corrugations, restrikes,
blades, and the like, and to cut openings of vari
ous size, shape, and position in the sheet in the
attempt to develop a great amount. of turbulence 50
in the stream of air ?owing through the core,
aswell as to cause contact of the flowing‘ air with
the metal of which the core is made. The pur
pose of resorting to such expedients is to remove
as great a quantity of heat-from the metal con-' 55
?ning the heated water as possible, the phe
nomena of conduction, radiation, and convection
all being relied upon to perform this function and
thus to effect the transference of as much heat
as possible from the water or other medium with
in the tube members to the air ?owing through
the air passages. To my knowledge, however, the
use of wire screen as the material from which to
a construct radiator ?ns has never before been
10 resorted to; whereas by its use, the problem of
providing means for insuring the very greatest de
gree of intimate contact with the metal has been
met, and moreover, without interfering with or
impeding the flow of air through the air passages.
The air is caused to pass through a much higher
number of ori?ces than can possibly be formed
in any sheet metal ?n, thereby reducing the blast
of air to a very large number of very ?ne streams
of air, each of which is in very close contact with
an area of material size contacting the associ
ated ?n 8, thereby increasing the efficiency of
heat transference from the tube member to the
wires of the ?n, which, as will readily be under
stood, are very highly ef?cient in transferring the
heat to the air impinging thereagainst.
The preferred form of ?n 8 for use with this
type of tube member, when composed of inter
woven metal wires as hereinabove .disclosed, is
also deformed to present a series of corrugations, 10
but,v instead of extending transversably as has
heretofore been the practice, the corrugations 2|
of each ?n 8 extend longitudinally of the core,
preferably throughout the entire length thereof
from the upper header tank to the lower.
The 15
corrugations 2| serve to increase the e?ective
thickness of each ?n, enabling it to hold the two
adjacent tube members ‘I separated and thus
present an air channel 22 therebetween.
Each \
20 the wires de?ning the ori?ce through which that ' of the side walls of each longitudinally extend
thus causing-the intimacy of contact which can
be ‘developed only by means of a cutting edge
ing corrugation 2| being very porous, practically
no impedance is offered thereby to the ?ow of air
through the channel 22,- in spite of the fact that
very intimate contact of each particle of air with
25 exposed to air ?ow, and also causing turbulence,
the effect of which is to direct the ?ow of air out
of a straight path and into contact with a neigh
boring portion of a water tube, another ?n, or
another section of the same ?n. These facts are
is preferable to use a ?n 8 wherein the corruga
tions 2| .also are ?attened at their crests 24 thus
stream is ?owing.
Each of the many wires forms
a cutting edge against which the air impinges,
so, believed to explain partially the superiority of wire
screen in the manufacture of radiator ?ns over
sheet metal used for that purpose.
Moreover, these advantages and others can be
gained without sacri?ce of any of the advanta
35 geous features of sheet metal. If the design of
any particular make of radiator core calls for
any particular con?guration of ?n, the wire
screen is just as susceptible to being so formed
as is the more conventional sheet metal. Hence 40 any desired size, shape and/or spacing of tube
members may be resorted to, the ?n being cut,
bent, and/or otherwise formed into whatever
size and shape of ?n is desirable with the selected
tube members.
Figure 1, for example, shows a small portion
of a radiator core 6 made up of alternately posi
tioned water tube members 1 and radiating ?ns
8, the latter of which being comprised of inter
,Woven wire 9 of metal, preferably copper, embody
'50 the principles of my present invention. Whereas
the ?n is adaptable to any suitable type of water
tube member, each of the tube members ‘I illus
trated is made up of a pair of elongated strips
II and |2 of copper the width of which coincides
55 'with the thickness of the ?nished core. Alon-g
their edges l3 the two strips are in contact-with
the wires of the ?n is had a number of times equal 25
to twice the number of corrugations 2|.
With the illustrated type of tube member ‘I, it
forming corrugations 2| which are substantially 30
square in cross section, and presenting relatively
large areas of contact between each ?attened
crest ll of each corrugation l6 of- the proximal
tube member ‘I. However, Figure 2 illustrates a
modi?ed form of ?n 3| adaptable for use with 35
various other well known types of tube members
of a “cellular” type core, but also embodying the
present invention inasmuch as it also is con
structed of wire fabric 32. This ?n 3| is also
corrugated, but it di?ers from the previously de 40
scribed ?n 8 in that its corrugations 33 extend.
transversably instead of longitudinally and each
corrugation 33 is of triangular cross section.
In order to facilitate assembly it may in some
instances be advisable to provide slight irregu
larities-in the surface‘of each tube member adapt
ed to be engaged by complementary irregularities
in the surface of the proximal ?n, thus serving as
locators tending to hold the several members
against slipping one on the other prior to and
during the soldering process. Such locators are
illustrated in Figure l as taking the form of a
depression or socket member 36 at each end of
each crest l6 of the tube members, within which
sockets are seated, raised portions or beads 31,
one of which is formed along vthe outeredge of
each other and are bent to zig-zag form, whereas ‘ each outer corrugation 2| of each ?n 8.
Figure 3 illustrates my present invention em- intermediate their edges, the strips are separated
to de?ne a water channel l4 therebetween. -The bodied in a radiator core 4| of the “tubular” type.
Here, instead of extending longitudinally of the 60
60 water channels |4 thus presented establish com
munication between the upper and lower header core parallel to the tube membersand zig-zag
tanks (not shown) in accordance with usual ging back and forth between two adjacent tube
practice, and hence, during operation of the de
members, each ?n 42, while being composed of
vice, each channel M has a stream of heated - woven wire fabric 43, extends transversably of the
65 ‘water to be cooled ?owing through it. In order tubes 44, each tube 44 extending through an ap
to induce turbulence in the stream of water in erture 4B in each ?n, these apertures being suit
each channel l4, and thus cause more of the ably proportioned to insure contact between each
heat of the water to be transmitted to the metal tube 44 and each ?n 42. The extent of such
of the tube member, it is customary to deform contact can be materially increased by extending
70 the metal de?ning the water channels, as, for ?aps 41 of the metal fabric displaced in forming
example, by providing transversely extending
' corrugations IS in any of several arrangements.
Here the crest of each outwardly extending cor
each aperture along the adjacent side wall 48
of the associated tube 44. Moreover, I prefer
to bend the forward edge 5| of each ?n 42 so >
rugation‘is preferably ?attened as indicated at as to form a ?ap 52 lying in a plane perpendicu
76 H. Each of these ?attened crests I1 provides lar to that of the remainder of the ?n and ex 75
tending ‘into contact with'the next adjacent ?n.
In this manner, the front of the radiator pre
sents the appearance of a continuous, ?at wire
' screen, concealing the tubes 44 therebehind" and
2. A radiator construction comprising a plural-J
ity of tube membersdisposed in spaced parallel
relation, and a radiating ?n disposed between
each two adjacent’ tube members, each of said‘
requiring that all the air passing through the ?ns being composed of wire screen and corru 5
air passages between tubes ?ow through the rel
gated to provide corrugations having their crests
atively ?ne apertures presented by such a‘ screen. alternately on oppositefaces of the ?n, said
It is customary commercial practice in assem Acrestsmaking contact with the associated tube
bling cores using ?ns made of sheet metal to. members, and said corrugations extending sub
10 fasten the parts permanently together by dip
stantially parallel to said tube members thereby 10
ping the assembled core in a bath of molten disposing the side walls of the corrugations in
solder, causing the ?ns _to be soldered to the positions extending across the air passages'be
tube members in an integral structure.‘ It is vtween said tube members, said tube members
preferable, however, when using ?ns embodying having irregularities in the surfaces thereof and
15 the present invention, to avoid the dipping proc
said ?ns having irregularities in the surfaces
, ess of soldering, as such method would have the
thereof complementary to and engaging those of
tendency to clog the openings of the screen of said tube ‘members to restrain said tube mem.—
which each ?n is made. Rather, a “baking” bers against movement relatively to said ?ns
process should be used, wherein each tube mem
prior to permanent fastening thereof. '
20 ber is ,“tinned” before assembly, and after as
.3.,In a radiator construction, a core compris 20
sembly the core dipped in a suitable acid or ‘ing a plurality of wire mesh ?ns disposed in
flux, and then the entire core placed in an oven spaced‘ parallel relation, and aplurality of tube
or the like where its temperature is raised high
er than the melting point of the solder. The
25 solder already present on the tube members will
?ow onto the portions of the ?n in contact there- -
with-forming a “sweated” joint fully as e?i
cient from the standpoints of strength and heat
transference as a “dipped” joint and requiring
30 so much less solder as to amount to a saving of
from one to four or more pounds of solder per
members spaced apart, each of said tube members
extending through and making contact with all r
of said ?ns, said ?ns being bent adjacent their
forward edges and each ?n so bent making con
tact with the next adjacent ?n to present a sub
stantially continuous screen extending across the
front of ‘said core.
4. In an automobile radiator, a core compris 30
ing water tube members spaced apart to de?ne
core, depending on the size of the latter. The
passages through which a flow of air in a predew
saving in weight thus attained is material, but
termined direction is induced, said water tubes
extending angularly with respect to the direction
the reduction in cost of the core is of still greater
importance, because the cost of solder is so high
as to represent a very material item in the cost
of the ?nished product. The present invention
contributes in another way toward reduction of
manufacturing cost for the reason that} the
of said air ?ow, and a ?n of foraminous material 35
interposed between each two adjacent water tube
members, and-corrugated to de?ne corrugations
having their crests alternately on opposite ‘faces
of the ?n, said corrugations extending sub
amount of copper screen necessary to construct ‘stantially parallel to said tubes and angularly 40
a ?n of given size costs materially less, because of
the smaller amount of metal present, than the
with respect to the direction of said air ?ow,
amount of sheet copper necessary to form a ?n
associated tube members and the side walls of
the corrugations extending across said air pas
sages, whereby said?ow of air is required to pass 45
through the foramina in said side walls.
5. In a radiator construction, a core compris
of that same size.
I claim:
1. A radiator construction comprising a plural
ity of tube members ‘disposed in spaced parallel
frelation, and a radiating ?n disposed between
' each two adjacent tube members, each of said
?ns being composed of wire screen and corru
‘ gated to provide corrugations having their crests
alternately on opposite faces of the ?n, said
crests making contact with the associated tube
members, and said corrugations extending sub
stantially parallel to the direction of ?ow through
said tube members thereby disposing the side
walls of the corrugations in positions extending
' across the air passages between said tube mem
the crests of said corrugations contacting the
ing a plurality of ?n members of foraminous ma?
terial disposed in spaced, parallel relation, and a
plurality of tube members arranged in contact '
withosaid ?ns for transmission of heat therebe
tween, said ?ns being bent adjacent edges there
'of to present po'rtions lying in the plane of the
associated face of said core and contacting the
next- adjacent member whereby all air going
through the spaces between saidtube members
is required to ?ow through at least one thickness
of said foraminous material.
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