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Патент USA US2136641

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Nov. 15, 1938.
H. F. SMITH
2,136,641
REFRIGERATING APPARATUS
‘ Filed Dec- 21. 1936
a Sheets-Sheet 2
BY
. 1%.“, Mum.
[W8 ATTORNEYS.
Nov. 15, 1938.
'
H. F‘. SMITH
2,136,641
REFRIGERATING APPARATUS
Filed Dec. 21, 1936
3 Sheets-Sheet 3
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Patented Nov. 15, 1938 u
2,136,641
. UNITED STATES
PATENT OFFICE '
2,136,641
REFRIGERATING APPARATUS
Harry F. Smith, Dayton, Ohio, assignor to General
Motors Corporation, Dayton, Ohio, at corpora
tion of Delaware
Application December 21, 1936, Serial No. 116,944
2 Claims.
(Cl. 257-263)‘ ‘
This invention relates to heat transfer de
vices and particularly to condenser constructions
for'refrigerating systems.
' An object of my invention is to provide a heat
5 exchanger‘ of the type having a closed ?uid con
veying passage extending therethrough and
which exchanger is of improved construction
and increased eiiiciency.
'
Another object of my invention is to provide a__
10 heat exchanger comprising a plurality of ‘parts,
adapted to be assembled together and bonded to
one another by present-day economical copper
hydrogen brazing methods to form a unitary
- device of improved structural strength.
15
A further object of my. invention is to provide
an improved heat exchanger ‘structure having
separate heat transfer ?ns disposed between and
contacting closed ?uid conveying ducts thereof
and having the ?ns interlocking and contacting
one another to provide a continuous fin surface
extending entirely across portions of, the struc
' _ture to reduce the temperature gradient between‘
‘certain portions of the heat exchanger.
A still further object of my invention is to in
crease the heat transfer efficiency of a heat ex
‘ Fig. 5 is a fragmentary sectional view similar
to Fig. 4 and taken on the line 5—5 of Fig. 6
showing a modi?ed end construction of the heat
exchanger;
‘ Fig. 6 is a fragmentary sectionaliview of the a
modi?ed end construction of the heat exchanger
taken on the line 6-6 of Fig. 5;
_
Fig. 7 is a plan view of a metal strip adapted
to be stamped‘and formed to‘ provide a fin ele
ment for the heat exchanger;
'
of Fig. 7 through the metal strip after having
apertures stamped therein; and
Fig. 9 is a fragmentary sectional view through
a ?n element formed from the metal strip dis 15
closed in Fig. 8 in accordance with‘the invention.
Referring to the drawings, for illustrating my
invention, I have shown in Fig. 1 thereof a uni
tary heat exchanger generally represented by
the reference character I ll, such for example as
a condenser for the refrigerating system. The
heat exchanger Ill comprises a plurality of su
perimposed and horizontally extending parallelly
arranged closed refrigerant conveying conduits
I l.
The conduits ll extend beyond the ex
changer to‘thereby obtain greater capacity from
changer proper and have pressed sheetgmetal
an exchanger of given size or to decrease the
overall dimensions of an exchanger of a pre
cap members l2 secured to the ends thereof. A
plurality of pipes or conduits l3 secured to cer
tain of the cap members I2 connect the refrig
determined capacity.
In carrying out the foregoing objects it is a
still further and more speci?c object of the in
vention to form certain portions of the ?uid con
veying conduits ofmy improved heat exchanger
from strips of sheet metal that‘are bent or folded
into the desired shape and have certain portions
thereof secured together to provide parts of the
?uid conduits with a plurality of closed passages.
Further objects and advantages of the present
invention will be apparent from the following
40 description, reference being had to the accom
panying drawings, wherein a preferred form of
the present'invention is clearly shown.
erant conveying conduits H ‘in communicative
relation to‘provide a series ?ow for refrigerating
?uid through the condenser or exchanger Ill.
The condenser l0 may be provided with inlet and
outlet pipe connections l4 and I5 respectively at
one end thereof. The heat exchanger 10 also
comprises a ?n arrangement for augmenting the
transfer of heat from ?uid in conduits II to the
air or other cooling medium for the ?uid and this -
arrangement includesa plurality of ?ns IS. A
metal plate I‘! is secured to the fins l6 at the top ‘
and bottom of the exchanger l0 and these plates
have flanges l8 extending outwardly therefrom
In the drawings:
Fig. 1 is‘a front elevational view of a heat ex
changer constructed in accordance with my in
‘which serve as mounting means for the ex
vention;
which is mounted an air circulating fan or
‘
Fig. 2 is an enlarged fragmentary end view of
the heat exchanger taken'in the direction of the
arrow 2 in Fig. 1 and showing the end portion
50 partly in elevation and partly in section;
Fig. 3 is a fragmentary view of the heat ex
changer partly in elevation and partly in section‘
and taken on the line 3—3 of Fig. 2;
_
‘Fig. 4 is a- fragmentary horizontal view of the
heat exchanger taken on the line 4—4 of ‘Fig. 2;
10
Fig. 8 is a sectional view taken on the line 8-8
changer orfor connecting same in an enclosed
path of air such as to a shroud or the like in
blower.
‘
Referring now to Fig. 2 of the drawings it
will be noted that the ?uid conduits ll extend
ing through the heat exchanger III are ?attened
as at 2| to provide a relatively ?at elongated
passage for the flow of refrigerant therein.
After the tubes or conduits I l have been ?attened
a strip of metal 22 corrugated ‘as at 23 is in
serted in each. of the conduits.
The corruga 65
2
2,130,1341
tions is formed in metal strip 22 provide ?at
portions 23 which lie against or abut the walls
of conduit ll. Metal strip 22 thus serves to d1-v
vide the refrigerating ?uid ?owing through con
duit ll into a plurality of paths of ?ow to there
by awment the transfer of heatbetween the
fluid and the conduit walls and consequently to
the ?n arrangement Ii of the heat exchanger.
The cap members I: of conduits ii have an
10 elongated portion 25 which is ?attened to cor
respond to the ?attened conduits II‘ and this
portion" ?ts over and is secured to the ends
mined size“ is assembled.‘ The cap members I2
I with the conduits l3 secured thereto are then as
sembled upon the heat exchanger with the ends
26 of conduits Ii ?tting into the elongated por
tion 25 of cap members i2 and the outwardly
?ared parts 21 in abutting relation with the end
of the ?n elements 3i employed to provide the
fin arrangement for the structure.
It will be
noted that, during the superimposing assembly
operation of the parts, the extending portions 31
of the ?n elements 3| overlap or straddle the
conduits II._ This straddling of fin members or
23 of the conduits H (see Figs. 3 and 4). The elements 3| on conduits I i is an essential feature
ends of the elongated portions 23 of cap mem , of this invention in order to permit the sub
.15 hers I! are ?aredoutwardly as at 21 adjacent the stantially continuous ?at portions formed by legs
exclmnger llandthese?angesaresecuredtothe 35 and 36 to abut against the ?attened portions
2| of the conduits. The extending portions 31 on
end portions of the fin arrangement It.
>
The ?n arrangement It of the heat exchanger ?n members 3i are of su?lcient length to interdhclosed comprises a plurality of corrugated or _fere with the extending portions 31 on other sup
folded metal strips generaly represented by the erimposed ?n members 3i during the assembly
reference character 3i. There is a corrugated operation. The extending portions 31 of mem
bers 3| which straddle the conduits ii are there
strip 3| interpowd between each of the superim
posed-conduits II and it will be noted that each fore telescoped together so as to be disposed in‘
corrmated strip provides a plurality of relatively contacting relation as shown in Fig. 3. The
tall thin
s through the exchanger Ill for smooth rounded end portions of the extensions
the ?ow of air or other cooling ?uid therethrough. 31 permits the telescoping or interlocking thereof to be readily carried out during the operation
The blank strip of metal- from which a corru
gated ?n element 3i is formed is disclosed at 32 of assembling parts of the structure together.
inl"lg.7. Theblank32is?rstpunchedoutas This telescoping or interlocking relation of the
15
.
20
25
Y~
at 33 to provide a plurality of spaced apart elon- , extensions 31 with one another thus provides a 30
continuous contacting ?n surface across the
gated apertures or openings. The material ad
iacent the lengthwise opposed walls 34 of the
openings formed by the punched out portions 33
are then bent in opposite directions to one an
otherasshownat? and" inFig. 7 to provide
legs or ?anges extending at right angles to the
extension of the strip 32. Alternate apertures in
the blank strip 32 have the opposed walls thereof
bent in opposite directions to the walls of adja
cent apertures as disclosed in Fig. 8 of the draw
ings for a purpose to be presently described. The
punched and preformed thin metal strip 32 shown
in Fig. 8 is then folded or bent on lines passing
through the center of an extending parallel
with the ‘extension of each aperture formed in
strip 32 to produce a length of corrugated strip
form 3|, a fragmentary portion of which is shown
in Fig. 9 of the drawings. By referring to Fig. 9
it will be seen that the folding operation per
formed on the preformed ?at strip 32 causes the
strip to assume a rig-sag form with the legs or
?anges 3| and 33 thereof extending in the same
direction and disposed closely adjacent one an
other. It will also be observed that the material
between the ends of the apertures in blank‘, 32
and the lengthwise edges of the blank extend be
yond the end walls ofthe apertures as at‘31 to
provide the corrugated structure II with raised
plurality of spaced apart conduits ii on each
side of the exchanger. This arrangement pro
vides a heat exchanger or condenser structure
wherein the temperature gradient between cer 35
tain portions-and relative to other portions there
of is greatly reduced to increase the efficiency
of the structure. It is obvious that the ?n ele
ments 3| afford a maximum amount of heat
transfer ?n surface for the exchanger l0 and 40
provide a plurality of narrow air passages through
the exchanger to thus cause substantially all air
circulated through the exchanger to contact
either the ?ns or the closed ?uid conduits there
of or both.
‘
After assembling all of the parts of the ex
changer structure it in the manner described
these plurality of parts may be secured or bonded
together in any conventional manner well-known
to those skilled in the art and now practiced in
the manufacture of such devices. For example,
the various assembled parts of the structure Ill
may bevbrazed together with the aid of copper
brazing material in a hydrogen furnace by insert
ing the structure therein or by passing same
therethrough. This brazing of the structure will
seal the plurality of ?uid conduit connections and
will provide a metal-to-m'etal contact of the fin
portions on each side of a ?at substantially con
elements 3i with one another and with the con
tinuom surface formed by the legs or ?anges 35
and 33. The ?at substantially continuous sur
faces formed by the legs 35 and 3t inwardly of
the extensions 31 are adapted to be placed in
abutting relation with and secured to the ?at
duits, II. The brazing of the structure will also 60
bond the leg portions 35 and 38 of the fin elements
3i to the ?at lengthwise extending portion of the
plate l1 to thereby provide a unitary heat ex
changer of increased structural strength.
Referring now to Figs. 5 and 6 of the drawings 65
it will be noted that I have disclosed a modi?ed
closed conduit structure for the heat exchanger
iii. In this modi?ed structure a pair of metal
strips II and 42 having their edges bent over to
provide legs are placed together in opposed rela
tion upon a corrugated strip 45. This strip 45
tenedsurface II of conduits ll.
'
In assembling the parts of the exchanger de
scribed a corrugated ?n strip element 3| is placed
upon a plate l1 and a conduit II is. then placed
upon the fin element 3| with the ?attened wall
10 3i thereof in intimate contact with the substan
tially continuous ?at surface of the fin formed
by the legs 33 and 3'. Another ?n element or
is constructed or formed in a fashion similar to
structure 3| is then placed over the conduit ll - the corrugated strip 22 to provide, when brazed
and the superimposing operations described are within strips ti and 42, a closed ?uid conduit
36. Since the edges 43 and 44 of metal strips 75
contimied until a heat exchanger of a predeter
2,186,641
3.
II and 42 are bent or disposed at right angles
What is claimed is as follows:
'
to the ?at longitudinally extending portions
1. A unitary heat exchanger comprising in com
thereof a~plug or the like element 41 must be bination, a closed ?uid conveying conduit having
placed between the elongated portion 25 of the a plurality of spaced apart portions, an element
cap members l2 at the point where the conduit ‘ interposed between each of the spaced apart por-l
46 is secured to the cap members. This plug 41 . tions of said conduit, each of said elements com
closes the space between the straight sided con
prising a single strip 01’ metal bent or folded in .
duit 4B and the semi-cylindrical inner ‘surface of zig-zag form to provide a plurality of fins ex
the portion 25 of cap members I2.
tending between said spaced apart portions of
10
From the foregoing it will be seen that I have said conduit and disposed in intimate thermal 10
provided an improved heat exchanger such as a
condenser for a refrigerating system and that the
contact therewith,v each of said elements being ‘
apertured inwardly of an edge portion thereof at
improved construction materially increases the the point of said bends or folds to position an
ve'tllciency of such devices and provides a device of ‘end portion of said ?ns in straddling‘relation to
is increased structural strength. By increasing the said conduit portions, and the straddling end por 15
e?lciency of a heat exchanger by incorporating tions of said ?ns of one element being telescoped
therein the maximum amount of ?n surface such a substantial distance into the straddling end por
structures can be made small and compact and a ' tions of another of said elements to provide an‘
structure of predetermined size will have greater
20 capacity than heretofore obtainable.
'1‘he_tele-
scoping or interlocking of the separate ?n ele
extended contacting surface. between the ?ns
along at least one side of said heat exchanger.
20
2. A heat exchanger including a closed fluid
conveying conduit having a pair of elements asso
ments with one another in my improved heat ex
changer construction provides or forms a con
ciated therewith, each of said elements compris
tinuous contacting ?n surface extending entirely ' ing a strip of metal folded back and forth to pro
across both sides of the exchanger and thereby vide a plurality of ?ns extending laterally from 25
decreases the temperature gradient between por
tions of the exchanger. It is thus seen that the
increased eillciency of my ‘improved heat ex
changer'is due partly to the placing of a maxi
mum amount of ?n surface extending across the
sides of the structure. The improved heat ex
changer is simple in construction and the meth
ods of assembling and manufacturing the same
can be carried out at low cost.
of said elements to provide an extended contact
While the form of embodiment of- the invention
as herein disclosed, constitutes a preferred form,
it is to be understood that other forms might be
adopted, all coming within the scope of the claims
which follow.
said conduit and disposed in intimate thermal
contact therewith, each of said elements being
apertured inwardly of an edge portion thereof at
the point of said folds to position an end portion
of said ?ns in straddling relation to said conduit, 80
and the straddling end portions of \said ?ns of
one element being telescoped a substantial dis
tance into the straddling end portions of the other
"
ing surface between the ?ns along a side of said 35
conduit.
-
HARRY 1". SMITH.
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