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Патент USA US2134089

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Oct. 25, 1938
Original Filed April 22, 1935
W. J,1
|i \Rmm
Patented Oct. 21"‘, 1938
Lawrence A. Philipp, Detroit, Mich., assignor, by
mesne ' assignments, to Nash-Kelvinator Cor
poration, Detroit, Mich., a corporation of Mary
Application April 22, 1935. Serial No. 17,692
Renewed March 3, 1938
2 Claims.
(Cl. 62-102)
My invention pertains ' to refrigerators and
particularly to a forced convection refrigerator
for household use.
It is an object of my invention to provide a
5 forced convection nonfrosting refrigerator com
prising means forming a concentrated cooling
zone including a refrigerated freezing section, a
?nned cooling unit and a motor driven fan'
5, which is mounted in the upper portion there
of. The cooling unit comprises an enclosure 1
having freezing plates 9 which are mounted
therein in vertically spaced relation for support
ing trays for freezing ice cubes or any desired 5
material therein. The freezing shelves 9 are
mounted spaced from the side walls of the en
closure 1 ‘and they may comprise either serpen
mounted above the cooling unit for circulating tine coils of refrigerant receiving conduit secured
10 the air in the compartment over the cooling unit .to the shelf plates in intimate heat exchange re- 10
around the freezing section in the cooling zone. lation therewith or they may comprise ?at re
It is also an object of my invention to provide frigerant receiving housings which in either form
such a refrigerator having a combined freezing are arranged for receiving vaporizable refriger
chamber and cooling unit mounted in spaced re
ant in series parallel relationin a well known
l5 lation adjacent the top wall and one of the side manner.
15 '
'walls of the cabinet having vertically disposed
heat conductive ?ns projecting from the side of v preferably comprises a cold compartment con
the cooling unit adjacent the side wall of the sisting of a separate enclosure II for freezing
cabinet and a, motor driven fan .for circulating
desserts or other -material requiring a lower
:0 the air from the upper central portion of the freezing
temperature.- The side wall of the com-- 20
compartment to ?ow over the cooling unit to
bined cooling unit freezing chamber adjacent the
ward and between the side wall of the compart
side wall of the cabinet is provided with coils l3
ment and the adjacent ?ns of the cooling unit. of refrigerant receiving conduit which are at
It is a further object of my invention to pro
tached thereto in close coupled thermal relation
;5 vide a refrigerator 'of the above type comprising -
as by welding or soldering. The outer surface of 25
the same freezing chamber wall supporting coils
relation adjacent the top wall of the compart
I3 is provided with vertically disposed heat con
ment and having a separate cooling unit ductive ?ns I5 which are secured thereto in
mounted behind the freezing chamber with an spaced relation as by welding or soldering. The
0 associated motor driven fan for circulating the. refrigerant receiving conduit means within the 30
air in the compartment in heat exchange rela
cooling unit 5 are operatively connected to re
tion through the cooling unit toward the upper ceive vaporizable liquid refrigerant in series or
wall of the compartment for de?ection around parallel series arrangement, from any suitable
the freezing chamber and uniform distribution 7 source, as will ‘be readily understood by those
5 around the compartment.
skilled in the art.
a freezing chamber which is mounted in spaced
The invention itself,'h.owever, both as to its‘
organization and its method of operation, to
gether with additional objects and advantages
thereof, will best be understood from the follow
) ing description of speci?c embodiments, when
read in conjunction with the accompanying
drawing, in which:
Fig. 1 is a front elevational view showing a
section taken transversely through a forced con
L vection refrigerator arranged in accordance with
my invention;
Fig. 2 is a plan sectional view, taken on line
-II-II of Fig. 3, showing a modi?ed embodiment .
of my invention; and
Fig. 3 is a vertical sectional view thereof, taken
on line III-III of Fig. 2.
Referring more particularly to Fig. 1 of the
drawing, the refrigerator consists of a food stor
age compartment I enclosed by a suitable heat
insulated cabinet 3 and cooled by a cooling unit
A small electric motor I ‘I is mounted on the
top wall of the cooling unit 5 in the space between
the freezing chamber and the top wall of the
cabinet with an air de?ecing fan [9 secured on '
the end of its shaft. The motor I‘! may be con- 40
nected for energization simultaneously with the
refrigerant compressor motor or cooling unit or
it may be connected directly to the line for con
tinuous operation if desired. The motor drives
the fan in a suitable direction for circulating the 45
air from the upper central portion of the com
partment over the cooling unit 5. The air is
then de?ected from the adjacent side wall 20
and ‘is forced downwardly, as indicated by the
arrows, and passes through the vertically disposed 50
heat conductive ?ns l5 projecting from the side
wall of the cooling'unit. If desired a drip pan
2| may be disposed under the cooling unit.
In accordance with my invention' the air in
the compartment is thusv 'circulatedat a high 65
velocity through the heat conductive ?ns around
the cooling unit, either continuously or while the _
refrigerant supply compressor is operated.
this manner the temperature of the air within
the food storage compartment is maintained sub
stantiallyv uniform in all positions in the com
partment, and the desired degree of refrigera
tion is obtained from the cooling unit which may
be operated at a su?iciently high temperature
to avoid freezing the moisture which condenses
thereon from the circulating air. Since the mois
ture is not frozen out of the air in the form of
frost, a portion of it returns to the circulating
air and its humidity is substantially maintained.
The optimum condition for preserving food in
the storage compartment is thus substantially
maintained and the severe dehydration of the
food products is avoided.
In accordance with the embodiment of my in-'
20 vention disclosed in Figs. 2 and 3, a freezing
chamber 25 is mounted in spaced relation from
the rear wall 21 of the cabinet providing suffi
cient space for mounting an open finned cooling
unit 29 therebetween. The cooling unit 29 may
25. be supported by brackets ill on the freezing
chamber or any other suitable manner, and it
comprises a well known construction of coiled
conduit having heat conductive ?ns. In this
embodiment, the air in the compartment is cooled
30 by circulating it through the independent cool
ing unit, and for the purpose of moving the air
therethrough at high velocity a motor driven fan
33 is suspended thereabove from the upper wall
of the cabinet. The electric motor 35 may be
35 of any type suitable for driving a fan and it is
removably secured to the upper wall 31 of the
cabinet by an extension 39 which is inserted
above a bracket 4| in the side wall, and a screw
clamp 42 which engages a laterally projecting
arm 43 extending from the opposite side of the
40 motor frame. The screw clamp projects down
wardly from the top wall 31 of the compartment
and carries a threaded wing nut 45 by which
the motor may be readily clamped in position.
In order to complete the energizating connec
tion for the motor'35, two prongs 41 on the
motor assembly are plugged into two female
sockets 49 in the upper wall 31 of the cabinet.
The electric connections may be extended from
the sockets through conductors 5| in the cabi
net walls to a suitable source of electrical energy.
The motor 35 may be energized either continu
ously, or in parallel with the compressor motor
(not shown) for operation simultaneously there
with, as desired. After the air is drawn upward
ly through the cooling coils 29 it impinges against
the upper wall of the cabinet thus distributing it.
In the embodiment shown in Figs. 2 and 3,
the freezing chamber 25 may be of any conven
tional construction for supporting trays to freeze
ice cubes or desserts, and the ?nned cooling unit
may be operatively interconnected with'refrig
erant expansion coils' in the freezing chamber
for receiving liquid refrigerant from any suit
able source.
It will be seen that vI have provided an im
proved forced convection refrigerator wherein the 1O
desired degree of refrigeration is obtained by
moving a large volume of air over the cooling
surfaces provided in a concentrated cooling zone
formed by mounting freezing and cooling means
in adjacent spaced relation from the top wall 15
and a side wall or corner of the compartment
to be cooled whereby frosting and defrosting
are eliminated, and the cooled air is distributed
to maintain uniform temperatures throughout
the food storage compartment.
Aside from the speci?c embodiments of the
invention herein shown and described, it will be
understood that numerous details of the con
struction may be altered or omitted without de
parting from the spirit and scope of the inven 25
tion as disclosed and claimed, and that I do not
desire to limit the invention to the exact con
structions herein set forth.
I claim as my invention:
1. Refrigerating apparatus comprising a cabi 30
net, an enclosure within said cabinet enclosing a
low temperature zone and having a wall exposed
to the circulating air in said cabinet for cooling
said circulating air, heat absorbing means with
in the space enclosed by said enclosure and 35
shielded from the direct contact from said cir
culating air including a portion thermally asso
ciated with said wall for cooling the circulating
air to the desired temperature and above the
prevailing temperature existing within said en 40
closure, and means for directing the flow of air
toward said wall.
2. Refrigerating apparatus comprising a cabi
net, an enclosure within said cabinet enclosing a
low temperature zone, including a wall posi 45
tioned in close proximity to a wall of the cabi
net to provide an air cooling zone, and heat ab
sorbing means including a portion positioned in
said low temperature zone for maintaining low
temperatures in said low temperature zone and
a portion positioned for cooling the circulating
air as it passes through said air cooling zone,
and a fan for directing the flow of air through
said air cooling zone.
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