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Патент USA US2410360

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Patented Oct. 29, 1946
2,410,360
UNITED STATES PATENT OFFICE
2,410,360
REFRIGERATIN G APPARATUS
Lawrence A. Philipp, Detroit, Mich, assignor to
Nash-Kelvinator Corporation, Detroit, Mich, a
corporation of Maryland
Application J annary 25, 1945, Serial No. 574,479
8 Claims.
(01. 62-126)
1
This invention relates to refrigerating appara
tus and, more particularly, to refrigerant evap
In the drawing, numeral 20 designates, in gen
eral, a refrigerator cabinet having an inner lining
orating units used in connection with such ap
paratus.
One of the objects of my invention is to pro
member 22 which forms the walls of a food com
vide an improved refrigerant evaporating unit
which is adapted to maintain different tempera
tures in a plurality of zones.
Another object of my invention is to provide an
partment 213. A door 25 is provided for affording
access to the food- compartment. Disposed with
in the food compartment is my improved refrig
erant evaporating unit designated, in general, by
the numeral 30.
‘
I
The refrigerant evaporating unit 3% comprises
improved refrigerant evaporating unit which in 10
two
C-shaped sections 32‘ and 313, respectively.
cludes a refrigerant evaporating section adapted
The section 32 consists of an inner metal sheet
to cool a zone to below freezing temperatures and
36 and an outer metal sheet 38 secured together
a second refrigerant evaporating section adapted
in face to face relationship and formed to pro
to maintain a second zone at fast freezing tem~
peratures, said sections together being adapted to 15 vide refrigerant passages therebetween. Aser
pentine corrugation is formed in the inner sheet
maintain a third zone at above freezing tempera
36 to provide a single refrigerant passage 40 which
tures.
lies within the top wall, designated by the nu
Another object of my invention is to provide an
meral 42, of the section 32. A plurality of parallel
improved refrigerant evaporating unit ‘which
comprises a non-?ooded section arranged to pro
vide a below freezing zone and a ?ooded section
arranged in conjunction with a second non
?ooded section to provide a fast freezing zone.
corrugations are formed‘ in the outer metal sheet
38 to provide refrigerant passages 44 which are
joined at their inlets by a manifold 56 formed in
thev outer sheet and at their outlets by a header
48 formed in both the inner and outer sheets.
Another object of my invention is to provide
The parallel passages it are arranged on the bot
an improved refrigerant evaporating unit which
tom wall and rear wall, designated 50 and 52,
comprises a C-shaped section having a single re
respectively, of the C-shaped section 32. The ser
frigerant passage and a second C-shaped section
pentine passage 40 is connected to the inlet mani
separated from the ?rst section by a partition and
fold 46 by means of a passage 54 and a number
having a single refrigerant passage connected in
of restricted passages 56 which are all formed
series to a plurality of parallel refrigerant pas
in the outer sheet 36. An inlet connection 58 is
sages joined at their outlet by a header.»
formed in the outer sheet 38 and arranged in
Further object and advantages of the present
open communication with the open end of the
invention will be apparent from the following
serpentine passage 40 while an outlet connection
description, reference being had to the accom
panying drawing, wherein a preferred form of 35 60 is also formed in the‘ outer sheet and arranged
in open communication ‘with the header 48. The
the present invention is clearly shown.
two sheets 36 and 38 are preferably welded around
In the drawing:
their peripheral edges and between the corru
, Fig. 1 is a fragmentary vertical front view in.
gations formed therein to provide the refrigerant
elevation and partly broken away of a refriger
ator showing my improved rerigerant evaporat 40 passages. The C-shaped section 32 is supported
within a U-shaped metal sheet 52 having side
ing unit;
»
walls 64 and 66 and a rear wall 68. The rear wall
Fig. 2 is a View shown partly in elevation and.
68 is partially cut away in order to expose the
partly diagrammatically of my improved refrig
,
rear
wall 52 of section 32 to circulating air within
erant evaporating unit and a refrigerating sys
the food compartment. Brackets ‘it are attached
tem associated therewith;
45 to the top of the U-shaped sheet 62 for fastening
Fig. 3 is a view in cross-section of a portion
same to the top wall of the inner lining member
of my improved refrigerant evaporating unit;
22 with the aid of bolts 12. The walls of the U
Fig. 4 is a view taken along the'lines 4-—4 of
shaped member 62 extend above the section 32
Fig. 1;
’
enclose in conjunction with the rear wall
Fig. 5 is a plan view of the sheet metal portions 50 and
52 and bottom wall 50 of section 32 and the top
of one section of my improved evaporating unit
wall of the inner liner 22 a fast freezing zone ‘it.
prior to bending; and
.
The C-shaped section 34 consists of an inner and
Fig. 6 is a plan view of the sheet metal portions
outer
metal sheet designated by numerals 8!} and
of another section of my evaporating unit prior
82, respectively, which are secured together in
to bending.
55 face to face relationship and formed to provide
2,410,360
3
refrigerant passages. A serpentine corrugation
crating unit 30, fast freezing temperatures will
be maintained in zone 74 during the on-cycle
and off-cycle periods of the condensing unit, be~
frigerant passage 85 which is arranged to extend
low freezing but higher temperatures will be main
substantially over the entire surface of the top,
tained in zone Ill! by section 35 and above freez~
bottom and rear walls, designated by numerals
ing temperatures will be maintained in the food
88, 9B and 92, respectively, of the section 34. An
compartment 2d by sections 32 and 34 ‘together.
inlet connection 94 and an outlet connection 96
Fast freezing temperatures are maintained by
are formed in the outer sheet 82 at the extremities
section 32 during both off and on cycles because
of the serpentine passage 85. A conduit 9'! con
hosts the outlet 96 of the serpentine passage 35 10 the ?ooded portions contain enough liquid re
frigerant at the expiration of the on-cycle to
to, the inlet 58 of the serpentine passage 48 of
maintain the heat absorbing effectiveness of the
section 32. The section 34 is attached to the side
section throughout the off-cycle. Section 34 is
wall 66 of the U-shaped sheet 62 by means of elon
maintained at a below freezing ‘temperature since
gated L-shaped members 98. Holes I05! are pro
it is supplied with the same low temperature re
vided in the top wall of section 34 to enable it to
frigerant as section 32 during the on-cycle but
be suspended from the inner liner 22 by means of
its temperature is somewhat higher than that of
bolts I02. A sheet metal wall. IE4 is attached
section 32 since during the off~cycle any liquid
to the open side of section 34 to provide in con
refrigerant it contains passes into the ?ooded
junction with the walls of section 34 and the
wall 66 a below freezing zone H0. Preferably, 20 portion of section 32. The temperature main
tained in compartment 24 is above freezing since
a door I I2 is provided at the front of the evap
substantially all the cooling of the circulating air
orating unit for preventing air from the food
is accomplished by only the refrigerated bottom
compartment 2!! from circulating into the interior
and back Walls of the evaporating unit, the side
of the zones ‘M and H0. An inverted U-shaped
shelf H4 is disposed intermediate the top and 25 walls not being refrigerated. Accordingly, it will
be clear from the foregoing that I have provided
bottom Walls of section 32 to provide a support
a refrigerant evaporating unit which is adapted
for receptacles. This shelf is supported on the
to maintain different temperatures in a plurality
bottom wall of the section 32 and is preferably re
of zones, and, more particularly, I have provided
movable therefrom, as shown in my Patent No.
a refrigerant evaporating unit which is adapted
2,325,705 issued August 3, 1943.
Liquid refrigerant is supplied to the refriger
to provide a frozen food storage zone, a fast
is formed in the outer sheet 82 to provide a re
ant evaporating unit 30 by means of a condens
ing unit I20 disposed in a machine compartment
freezing zone and an above freezing food storage
(notshown) provided in the cabinet 28. The
Although only a preferred form of the inven
condensing unit comprises a sealed motor com
tion has been illustrated, and that form described
in detail, it will be apparent to those skilled in
pressor unit I22 and a condenser I24. Evaporated
refrigerant is returned from the outlet Bil of the
zone.
.
the art that various modi?cations may be made
therein without departing from the spirit of the
header. 48 through a conduit I26 to the com
invention or from the scope of the appended
pressor 122. It is there compressed and delivered
to the condenser I24 through a conduit I28. The 40 claims.
condenser liquefies the compressed refrigerant
I claim:
1. A refrigerant evaporating unit comprising a
and then delivers it to a small diameter tube I39
which conveys the lique?ed refrigerant to the
inlet 94 of the serpentine passage 86. This small
diameter tube I39 serves to meter the ?ow of v.
liquid refrigerant in a. manner well understood
in the art. Preferably, the small diameter tube
I30 and the returned conduit I25 are arranged
in heat exchange relation, as indicated at $32.
The liquid refrigerant entering the serpentine ;
passage 86 is circulated therethrough to the in
terconnecting conduit 97, some evaporation of the
c-shaped section having a single refrigerant flow
passage and a second C-shaped section having a
plurality of parallel passages and a single refrig
erant flow passage communicating at one end with
said parallel passages and at the other end with
said ?rst mentioned single refrigerant flow pas
sage.
2. A refrigerant evaporating unit comprising a
non-?ooded refrigerant evaporating element hav
ing parallel refrigerated walls arranged to provide
liquid refrigerant taking place in the serpentine
a low temperature zone ,therebetween, a second
non-?ooded refrigerant evaporating element and
passage; The mixture of evaporated and un
evaporated refrigerant is then conducted through ; 1, a ?ooded refrigerant evaporating element ar
ranged to provide a fast freezing zone therebe
the serpentine passage 40 in the top wall 42 of
tween, said ?rst mentioned non-?ooded evaporat
section 32. It is then conveyed from this s_er~
ing element and said ?ooded evaporating element
pentine passage 48 through the conduit 54 and
being arranged to cool circulating air in a third
restricted passages 56 to the distributing mani
'
fold 48 of the parallel passages Ml. These re 60 zone.
3. A refrigerant evaporating unit comprising a
stricted passages 48 aid in promoting uniform
non-?ooded refrigerant evaporating element hav
circulation of refrigerant through the parallel
ing parallel refrigerated walls arranged to pro
passages 44. These parallel passages All are main-_
tained in a flooded condition during normal op ‘,_. vide a low temperature zone therebetween, a sec
0nd non-?ooded refrigerant evaporating element
erations of the system. Evaporated refrigeran
is withdrawn from the header t8 connecting these
parallel passages back to the compressor through
the conduit I26 to repeat the cycle just described.
and a ?ooded refrigerant evaporating element
having a portion arranged in parallel with said
second non-?ooded evaporating element to pro
The system is preferably intermittently oper~
.vide a fast freezing zone therebetween, said ?rst
mentioned non-?ooded evaporating element and
ated under the control of a thermostat (not
said ?ooded evaporating element being arranged
shown) so as to maintain the (‘s-shaped section
to cool circulating air in a third zone.
;
32 at a sufficiently low temperature during one
4. A refrigerant evaporating unit comprising a
oration of ‘the condensing unit to provide fast
freezing temperatures within the zone 14. Then _ non-?ooded refrigerant evaporating element hav
because of the improved construction of the evap 75 ing parallel refrigerated walls arranged to provide
5
2,410,360
6
a low temperature zone therebe'tween, a second
said other compartment, said evaporating means
being connected in refrigerant ?ow relationship
non-?ooded refrigerant evaporating element and
a ?ooded refrigerant evaporating element having
in sequence in the order named.
'7. Heat absorbing means comprising three ver
a portion arranged in parallel with said second
non-?ooded evaporating element to provide a
fast freezing zone therebetween, said refrigerant
evaporating elements being connected in refrig
erant ?ow relationship in the order named.
5. A refrigerant evaporating unit comprising
sheet material arranged to pro'vide two compart
ments, a serpentine refrigerant passage associated
with one of said compartments only, a second
serpentine refrigerant passage associated in heat
exchange relation with a Wall of the other com
partment only and a plurality of parallel refrig
erant passages associated in heat exchange rela
tion with the opposite wall of said other com
partment, said refrigerant passages being con
nected in refrigerant ?ow relationship in sequence
in the order named.
6. A refrigerant evaporating unit comprising
sheet material arranged to provide two adjacent
compartments, non-?ooded refrigerant evaporat
ing means associated with the walls of one of said
compartments only, non-flooded refrigerant
evaporating means associated in heat exchange
relation with a wall of the other compartment
only and ?ooded evaporating means associated in
heat exchange relation with an opposite wall of
CH
tically extending single ply sheets of ‘metal in
spaced apart relationship, refrigerant conveying
means extending between the uppermost edges
of only two of said sheets, refrigerant conveying
means extending between one of said two sheets
10
and the third substantially midway between the
upper and lower portions thereof, and refrig
erant conveying means extending across the
spaces between the lower portions of all three of
said sheets.
8. Heat absorbing means comprising three ver
tically extending single ply sheets of metal in
spaced apart relationship, refrigerant conveying
means extending between the uppermost edges of
only two of said sheets, refrigerant conveying
means extending between one of said two sheets
and the third substantially midway between the
upper and lower portions thereof, vertically ex
tending refrigerant ccnveying means extending
between the vertical edges at one-end of each of
said three sheets, and refrigerant conveying
means extending across the spaces between the
lower portions of all three of said sheets.
LAWRENCE A. PHILIPP.
'
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