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Патент USA US2137861

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Nov.‘ 22, 1938.
‘
c. STEENSTRUP
‘
2,137,861
REFRIGERATOR EVAPORATOR AND METHOD OF MAKING SAME
Filed Aug. 28, 1929
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Patented Nov. 22, 1938
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2,137,351.
UNITED STATES PATENT OFFICE
2,137,861
REFRIGERATOR EVAPORATOR AND
METHOD OF MAKING SAME
Christian Steenstrup, Schenectady, N. Y., assign
or to General Electric Company, a corporation
of New York
Application August 28, 1929, 'Serial No. 389,050
20 Claims. (Cl.62--126‘)
My invention relates to refrigerator evaporators or expansion chambers and the method
of making them and has for its object the provision of .an improved evaporator construction of‘
5 simple form which can‘be readily fabricated
passages I9 extending throughout the continuous I
wall and Opening at both ends thereof .into the
header I0 thereby providing a sharp freezing
chamber completely surrounded by the wall. By
this arrangement refrigerant ‘from the header 5
from metal plates. This evaporator includes a 4 can freely circulate through the passages I9
header and a continuous curved wall having the which communicate therewith so as to freeze
edges thereof integral with the header and pro_
vided with a plurality of passages for the circula‘tion of refrigerant therethrough from the header,
a‘ portion of the curved wall depending from the
header constituting a shelf for receiving and supporting articles such as receptacles containing
?uids to be frozen, and the entire evaporator
being adapted to cool a refrigerator cabinet Or
the like; In accordance with my improved meth0d of making this evaporator I join together two
plates or sheet metal walls, one of which is corrugated, and form them to constitute a shelf with
the edges of the plates extending upwardly, and
‘utilize the edges of the plates to form a header
from which refrigerant can circulate between
the plates, so as to freeze articles placed on the
shelf and provide the evaporator with the required heat absorbing surface.
My invention will be more ‘fully set forth in the
following description referring to the accompanying drawing, and the features of novelty
which characterize my invention will be pointed
out with particularity in the claims annexed to
10
15
' 20
25
30
and forming a part of this specification.
‘
_
In the drawing, Fig. 1 15a perspective view of
an evaporator embodying my invention, partly
‘broken away; Figs. 2 to 5 inclusive show the
35 evaporator in several stages of‘ its manufacture
when it is made in accordance with my 1111proved method, and Fig. 6 is a. front elevation
' 'of a refrigerator having my improved evaporator
therein.
‘40
>
Referring to the drawing, the evaporator construction which I have shown as illustrative of
one manner of carrying out my invention, in~
cludes a cylindrical header Hi, the ends of which
are closed by caps II and I2, the caps being
45 provided with lugs l3 and II for supporting the
evaporator in the refrigerator cabinet, as shown
in Fig. 6. These lugs are made hollow and of
small cross section to reduce the heat leakage
from the box top‘to the evaporator. A 001150 tinuous wall I5 is formed with a ?attened porI tionu l6, and upwardly curved ends II which are
integral with the header In as indicated at I8 and
constitute laterally and downwardly depending
side walls for supporting the shelf from the
55 header. This wall is provided with a plurality of
articles placed on the shelf l6 and absorb su?i
cient heat from the interior of the refrigerator
cabinet, or the like, in which the evaporator is
placed, to maintain the same at the desired low
temperature. I prefer to form or fabricate the
continuous wall l5 of a one-piece corrugated or
embossed plate 2|] and a one-piece flat plate 2|
which is folded over the‘ edge of the corrugated
plate and secured thereto as indicated, at 22.
The wall portions of the two plates cooperate
so that the corrugations of ‘the plate 20 ,form a
series of separate parallel passages l9 in the wall
I5. These plates constitute inner and outer shells
of the evaporator- Liquid refrigerant is supplied
to‘ the header of the evaporator by the supply
pipe 23 and vaporized‘ refrigerant is Withdrawn
therefrom through the, Pipe 24 which is turned
upwardly at 25 in the header and is provided with
a baffle plate 25 which Prevents liquid refriger
ant from being withdrawn from the header, it
being understood that the level of the refriger
ant in the header I0 is slightly below the baffle 25
In accordance with- my improved method of
10
16
20
25
30
making the above described evaporator construc
tion, I form the corrugated plate 20 with up
turned portions 21 and embossed arcuate ends
or header portions 28, and the ?at plate 2| with
upturned portions 29 adapted to conform to the 35 '
upturned portions of the plate 20 and arcuate
ends or header portions 30 embossed oppositely
to the end portions 28 of the plate 20, the edges
of the plate 2| being turned downwardly as in
dicated at 3|.
I then place or superpose the 40
plate 2| on the plate 20 so that the complemen
tary header portions register and fold the edges
3| thereof Over the edges of the plate 20 and bend
the ‘plates thus joined together approximately
into the form shown in Fig. 4.
45
In order to prevent the plates 2|] and 2| of the
evaporator being spread apart by the pressure of
the refrigerant therein, I prefer to securely braze
the plates together and in order to do this most
effectively it is desirable to bring the plates into 50
as close mechanical contact as possible.
I do
this by spot Welding the plates 20 and ‘2| together
between the corrugations Where the corrugations
terminate near the opposite edges of the sheet 20
as indicated at 32 in Fig. 3 when the plates are 65
in the form shown in Fig. 4, and while the plates
plates being formed and secured together to con
are in this form I place copper wires 33 in each
of the passages formed between the corruga
tions of the plate 20 and the plate 2| of such
length as to extend entirely through the passages.
stitute a header.
including a curved corrugated plate and another
curved plate secured thereto to form passages
After the plates are spot welded together in the
form shown in Fig. 4 I bend them into the form
for the ?ow of refrigerant between said plates,
the opposite ends of both of said plates being
shown in Fig. 5 and weld the arcuate portions 28
and 30 of the plates together where they come in
10 contact at 34 to form the cylindrical header III;
formed and secured together at the ends of said
corrugations to constitute a header.
3. The method of making an evaporator for
refrigerating machines which includes forming
each of the sheets or shells 20 and 2| thus has
its ends welded together in-a single seam extend
ing along the vertical median plane of the as
sembled evaporator. It will be noted that when
the shells 20 and 2| are welded together at points
such as those indicated at 32 in Fig. 3, there is a
substantial distance between the welded por
tions of the plates. When the plates are bent,
there is a tendency for the inner plate to be
20 compressed and the outer plate to be stretched,
and it is evident, therefore, that the bending of
the plates will stretch the outer plate over the
inner plate and securely bind them together
without the necessity of providing welded ‘con
nections over their entire area.
This binding
action produced during bending thus provides
the close mechanical contact desired for the‘
brazing operation. I then press the caps H and
I2 in the ends of the header"), weld them there
30 to, and place the evaporator in a suitable brazing
furnace so as to melt the copper wires 33 and
securely braze the plates 20 and 2| together and
the caps II and [2 in‘ the cylindrical header
thereby completely uniting the sheets and sealing
all the edges thereof. By brazing the plates 20
and 2| together in this manner the portions of
the corrugations formed in the plate 20 in con
tact with the plate 2| are brazed thereto through
2. An evaporator i'or refrigerating machines
semi-cylindrical portions at the opposite ends of
smooth and corrugated plates, joining said plates
together to form passages for the circulation of
refrigerant between them, and joining the oppo
site ends of said semi-cylindrical portions to
gether to form a header for the evaporator.
4. The method of making an evaporator for
refrigerating machines which includes attach
ing the end of a corrugated plate and another
plate together, and pressing said plates together
by bending said plates to the form required in
the completed evaporator.
5. The method of making an evaporator for
refrigerating machines which includes forming 25
the opposite ends of a corrugated plate and an
other plate so that they can be joined together
to form a header, attaching said plates to each
other adjacent the ends thereof to form passages
between them, bending said plates to the form 30
required in the completed evaporator, and joining
the opposite ends of said plates together to form
a header.
6. The method of making an evaporator for
refrigerating machines which includes forming 35
the ends of a corrugated plate and another plate
so that they can be joined together to form a
header, attaching said plates to each other adja
out their length and closely adjacent the wall
cent the ends thereof to form passages between
of the header l0 so that the evaporator will
effectively withstand high pressure without any
bulging of the walls. As the header I0 is cylin
drical, the sheet metal used in constructing the
them, bending said plates to the approximate
form required in the completed evaporator, join
evaporator can ‘be made quite thin as this form
of header provides for the most economical use
40
ing the ends of said plates together to form a
header, and uniting the ridges of said corruga
tions with said other plate.
-
'7. A sheet metal evaporator comprising an 45
outer one-piece shell having an arcuate portion
of sheet metal to withstand the desired pressure
and, as the portions of the corrugations in the ' and laterally extending side walls bent to form
plate 20 are brazed or united to the plate 2|, the a sharp freezing chamber or chambers, an inner
sheet metal is also utilized to the best advantage one-piece shell having an oppositely formed ar
cuate portion, and laterally extending walls coop
to withstand pressure so that high pressure in
the evaporator will not cause any separation of erating with the side walls of the outer shell, said
the plates 20 and 2|. By this arrangement the two arcuate portions registering complementally
entire evaporator construction can be made of to form a substantially cylindrical header, one
thinner metal than the constructions heretofore of said laterally extending walls being embossed
to provide passageways leading from said header.
55 proposed so that a substantial economy in the
8. A sheet metal evaporator comprising an
_manufacture of the evaporator is attained. The
outer one-piece shell having an arcuate portion
evaporator may then be ?nished in any manner
and side walls extending outwardly and down
desired, but‘ I prefer to coat the same with a
wardly, said side walls being bent to form a
suitable vitreous enamel.
chamber or chambers, an inner
Modifications of the construction which I have sharp freezing
shell having an oppositely formed ar
disclosed and the particular method described one-piece
cuate depression, and outwardly and downwardly
will occur to those skilled in the art so that I extending side walls cooperating with the side
desire my invention not to be limited to the par
walls of the outer shell, said two arcuate portions
ticular construction shown, or the particular registering complementally to form a substan
65
method set forth, and I desire in the appended tially cylindrical header and said cooperating
claims to cover all modi?cations which do not walls providing means for the passage of refrig
depart from the spirit and scope of my inven
erant from said header, said two 'shells being se
tion.
'
'
cured together by welding, each of said shells hav
WhatI claim as new and desire to secure by ing a single‘ welded seam extending longitudinally
70
Letters Patent of the United States is:
‘
along the vertical median plane of the assembled
1. An evaporator for refrigerating machines in
evaporator.
_
.
cluding two curved plates secured together to
9. A sheet metal evaporator comprising outer
form a passage for the ?ow of refrigerant be
and inner shells fabricated to each form a portion
75 tween- them, the opposite ends of both of said of a cylindrical header and laterally and down-
50
55
60
as
75
9,187,881
3
wardly depending sidewalls, one of said side walls
15. A sheet metal evaporator comprising. an
outer one-piece shell having an arcuate portion
gether in the'spaces between the corrugations be
and side walls extending outwardly and down
fore bending, said. welded side walls ‘being bent‘ wardly, said side walls being bent to form a sharp
to form the sides‘ and bottom of a sharp freezing freezing chamber, an inner one-piece shell hav 5
chambers V
r
.
ing an oppositely formed arcuate portion, out
10. A process of making an evaporator for a wardly and downwardly extending side walls co
refrigerator from two sheets of metal, which com
operating with the side walls of the outer shell,
prises forming vcomplementary header depressions said two arcuate portions registering comple
10. " in a portion of each sheet and laterally extending
mentally to form a substantially cylindrical head 10
' parallel corrugations in one sheet opening at one er, one of said laterally extending side walls being
end into said header portion, superposing said embossed to provide passageways extending from
sheets so “that the ‘header portions register, weld
one side to the other of said header, the embossed
ing the sheets together between the corrugations, portions of one of said walls in contact with the
15 andthen ‘bending the sheets thus secured to
other‘ wall being united therewith closely adjacent 15
gather in the form of an evaporator, the sheets the wall of said header.
being sealed by limiting the edges thereof.
16. The method of manufacturing an expan
11'. A process of making an ‘evaporator for a sion chamber for a mechanical refrigerating ma
refrigerator from two sheets of metal, which con
chine, comprising, ?rst corrugating one of two
20 sists in forming complementary header depres
walls, then welding the two walls together be 20v
sions in a portion-of each sheet and laterally ex
tween the corrugations and at or near their pe
'- jtendingv parallel corrugations inv one sheet, said ripheries, and then bending the integral con
corrugations‘ opening at one end into said header struction to form’ a plurality of walls of a sharp
portion and terminating near the opposite edge' freezing chamber adapted to receive a receptacle.
25 of said sheet, superimposing said sheets so that
17. The method of manufacturing an expan
‘.the' header portions register, welding the sheets , sion chamber for a refrigerating machine, com 25
together between the corrugations, and then prising, flrst corrugating one of two walls, then
bending the sheets thus secured together into the welding the two walls together between the cor
. formlof an evaporator, the sheets being sealed
rugations, and then bending the‘integral con
‘
30. by uniting the edges thereof.
struction to form a plurality of walls of a sharp 30
12.‘ A process of making an evaporatorfor a freezing chamberadapted to receive a receptacle.
frefrigerator from two sheets of metal, which
18. The ‘method of manufacturing an expan
being. corrugate_d,e-'said shells being welded. to
\
.
' consists in forming complementary header de
pressions in, each sheet and laterally extending
parallel corrugations in one sheet, said. corruga-‘
tions opening at one end into said header portion 20f, passages communicating therewith, then weld
ing the two walls together between the embossed
, '
and terminating near- the opposite edge of said
'‘ sheet, superimposing said sheets so that the head
er portions register, welding the sheets together,
betweenthe corrugations and then bending the
sheets‘ thussecured together into the form of
i
‘4..
an evaporator.
,
-
.13; A sheetv metal evaporator comprising an
~ outer one-‘piece shell having an arcuate portion
.45 and-:‘side walls extending outwardly and down
wardl'y,said side walls being bent to form a sharp
_ freezing chamber or chambers, an inner one
piece ‘shell'having an oppositely formed arcuate
depression,‘ and ‘outwardly and downwardly ex
50 tending side walls cooperating with the side walls
of the outer shell, said two arcuate portions reg
' istering complementally to form a substantially
_ cylindrical header and said cooperating walls
5 providing means for the passage of refrigerant
55 from said header, said two shells being secured
‘
-.
_ together.
14. A sheet metal evaporator comprising an
1' outer‘ one-piece shell having an arcuate portion
and side walls extending outwardly and down
60 wardly, said side walls being bent to form a sharp
freezing chamber or chambers,‘ an inner one
__
sion chamber for a refrigerating machine com
prising, ?rst embossing at least one of two walls
to provide portions of a header and a plurality 85
portions thereof, then bending the integral con
struction until portions thereof come into contact
toiform walls completely surrounding a freezing
chamber, and securing together the walls of said
freezing‘chamber along their line of contact.
19. The method of‘ manufacturing an expan
sion chamber for a refrigerating machine which
comprises providing two sheet metal walls,v em
bossing at least one of the walls to provide a
header portion, corrugating at least one of the
walls to provide passages adapted to communi
cate with said header portion, then welding the
walls together between the ‘corrugations, and 50
then bending the integral construction to form
a plurality of walls of a sharp freezing chamber.
20.‘ A sheet metal evaporator comprising an
outer one-piece shell having an arcuate portion
and side walls extending outwardly and down 55
wardly, said side walls being bent to form a sharp
freezing chamber, an inner one-piece shell hav
ing an oppositely formed arcuate portion, out
wardly and downwardly extending side walls co
operating with the side walls of the outer shell, 60
said two arcuate portions registering comple
piece shell‘ having an oppositely formed arcuate
depression, and outwardly and downwardly ex ‘ mentally to form a substantially cylindrical
tending side walls cooperating with the side walls ‘ header, one of said side walls being embossed to
provide passageways extending from said header,
65 of the outer shell, said two arcuate portions reg
istering complementall'y to form a substantially the embossed portions of one of said walls in
cylindrical header and said cooperating walls contact withthe other wall being united there
providing means for the passage‘ of'refrigerant with closely adiacent the wall of said header.
from said header, said two shells being secured
.‘
' .
70 together by welding.
CHRISTIAN B‘I'EENS'I'RUP. 10
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