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Патент USA US3050965

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Aug. 28, 1962
1.. J.‘ MANN ETAL
3,050,961
SINGLE EVAPORATOR TWO-COMPARTMENT REFRIGERATOR
Original Filed. July 8‘, 1960
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INVENTORS
LEONARD J. MANN
JOHN J. o‘comusu
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Aug. 28, 1962
L. J. MANN ETAL
3,050,961
SINGLE EVAPORATOR TWO-COMPARTMENT REFRIGERATOR
Original Filed July 8, 1960
6 Sheets-Sheet 2
INVENTOR5
LEONARD J. MANN
JOHN J. O'CONNELL
BY / // Z5555
THEIR ATTORNEY
Aug. 28, 1962
|_. J. MANN ETAL
3,050,961
SINGLE EVAFORATOR TWO-COMPARTMENT REFRIGERATOR
Original Filed July 8, 1960
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INVENTORS
LEONARD J. MANN
JOHN J.- ‘c u. L
THEIR ATTORNEY
Aug. 28, 1962
|_. J. MANN ETAL.
3,050,961
SINGLE EVAPORATOR TWQ-COMPARTMENT REFRIGERATOR
Original Filed July 8, 1960
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INVENTOR?m
LEONARD J. MANN
JOHN J. o'cnmm I
BY . //;,wp
THEIR ATTORNEY
Aug. 28, 1962
|_. J. MANN ETAL
3,050,961
SINGLE EVAPORATOR TWO-COMPARTMENT REFRIGERATOR
Original Filed July 8, 1960
6 Sheets-Sheet 6
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INVEN-TOR5
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LEONARD J. MANN
JOHN J. O'CONNELL
/ // 7/?’ ,
: BY
THEIR ATTORNEY
United States Patent O?ice
‘l
3,050,961
Patented Aug. 28, 1952
2
the front edge of its false bottom wall into the evaporator
3,tl50,96l
SINGLE EVAPG‘RA'I‘GR TWO-QGMPARTMENT
REFRIGERATGR
Leonard J. Mann and John .I. U’Connell, Dayton, Ohio,
assignors to General Motors Corporation, Detroit,
Mich, a corporation of Delaware
Continuation of application Ser. No. 41,614, July 8,
1960. This application May 9, I961, Ser. No. 116,224
18 Claims. (Cl. 62-419)
This application is a continuation of our copending ap
plication Serial No. 41,614, ?led July 8, 1960, now aban
doned.
compartment. The air from the side passages as well as
the air drawn from the front of the below freezing com
' partment is drawn through the center passage between the
evaporator plates to the inlet of the fan at the rear. The
moist air from the above freezing compartment ?rst con
tacts the side edges of the evaporator and deposits the
most of its moisture thereon in the form of frost. The air
from the below freezing compartment contains much less
.moisture and joins the dehumidi?ed air from the above
freezing compartment at the front where, in the rearward
?ow of air, much of the remainder of the moisture from
the air in both compartments is deposited in the form of
This invention relates to refrigerating apparatus and
frost in the center passage. The blower at the rear has an
more particularly to household refrigerators with above
upwardly extending outlet which discharges into the upper
and below freezing compartments in which frost will not
portion of the below freezing compartment and a down
collect.
wardly extending outlet which discharges through a ther
Refrigerators that are free of frost are popular. Because
mostatically controlled valve into the above freezing com
of the high sale price, they are limited to those having
partment. The operation of the system is normally con
larger incomes. This is partially caused by the fact that
trolled by a thermostat in the inlet to the below freezing
these frost-free refrigerators have been built with separate
compartment duct of the fan and controls the cycling of
evaporators for each compartment. Attempts have been
the refrigerating system as well as the operation of the
made to cool both compartments with a single evaporator.
fan. Periodically, refrigeration is discontinued and the
However, the rapid accumulation of frost from the air
fan is stopped while an electric heater in contact with the
received from the above freezing compartment caused the 25 evaporator heats the evaporator rapidly to defrost it and
evaporator air spaces to become rapidly clogged with frost
to remove the frost therefrom before the compartments
so as to prevent the proper circulation of air between the
are permitted to warm up any substantial amount. There
compartments and the evaporator. This required very fre
quent defrosting. Furthermore, because of the relatively
large accumulation of frost where the circulating air ?rst
after, refrigeration ‘and the operation of the fan are re
sumed.
contacted the evaporator, it was dif?cult to defrost the
partment is passed directly into contact with the bottom of
evaporator rapidly enough to prevent the below freezing
compartment temperature from rising an undesirable
amount.
In a second form, the air from the above freezing com
the evaporator while the air from the below freezing com
partment initially contacts the evaporator at the front.
This also distributes the frost during the refrigerating cycle
It is an object of this invention to provide an arrange 35 so that clogging is reduced and defrosting the evaporator
ment in which a single evaporator cools the below and
is made more rapid, uniform and complete.
above freezing compartments by circulating the air in
such a way that the air from the below and the above
freezing compartments each initially contact the evap
orator at different places to distribute the frost formation
Further objects and advantages of the present invention
will be apparent from the following ‘description, reference
being had to the accompanying drawings wherein preferred
embodiments of the present invention are clearly shown.
In the drawings:
possible rapid and complete defrosting.
FIGURE 1 is a vertical front sectional view taken sub
It is another object of this invention to provide a refrig
stantially along the line 1—1 of FIGURE 2 of a two-com
erator arrangement in which a single evaporator cools the
partment household refrigerator embodying one form of
below ‘and above freezing compartments in which the air 45 my invention;
is circulated in such a way that the air from the above
FIGURE 2 is a fragmentary side vertical section taken
freezing compartment is passed along one side of the evap
substantially along the line 2--2 of FIGURE 1;
orator to remove the greater portion of the moisture from
FIGURE 3 is a horizontal sectional view taken substan
it before it joins the below freezing compartment circu
tially along the line 3—3 of FIGURE 2;
lating air in heat transfer with the remainder of the evap 50
FIGURE 4 is a fragmentary vertical sectional view
orator to prevent the obstruction of the air ?ow and to
taken substantially along the line 4-—-4 of FIGURE 3
and to prevent obstruction to the air flow and to make
make possible rapid and complete defrosting.
These and other objects are illustrated in the two forms
showing the louvers in section;
FIGURE 5 is a fragmentary side vertical sectional
shown in the drawings in which the upper below freezing
view taken substantially along the line 5-5 of FIG
compartment is provided with a false bottom wall ex 55 URE 3;
tending over the evaporator compartment which contains
FIGURE 6 is a plan view of the plate type evaporator
a folded plate type evaporator provided with louvers be
shown in FIGURES 1 to 5;
tween the refrigerant passages so as to allow air flow
FIGURE 7 is a wiring diagram for the refrigerator
through it. This evaporator compartment is divided by
shown in FIGURES 1 to 6;
dividing members into a central passage and two side pas 60
FIGURE 8 is a diagrammatic view of the refrigerating
sages extending from the front to the rear. The above
system shown in FIGURES 1 to 6;
freezing compartment is provided ‘with a false top wall
FIGURE 9 is a front vertical sectional view of a modi
having ?ve apertures adjacent its front end through which
?ed form of the invention taken substantially along the
air ?ows from the compartment into a duct immediately
above the false top wall so that the air is conveyed to the 65 line 9—9 of FIGURE 10; and
FIGURE 10‘ is a side vertical sectional view of the form
two rear corners. At the rear corners, the air passes up
shown in FIGURE 9 taken along the line 10—10 thereof.
wardly through the insulation and the drain pan to the side
Referring now more particularly to FIGURES 1 to 4,
passages of the evaporator compartment. The air ?ows
there is shown a refrigerator cabinet 20 having insulated
forwardly in these side passages in contact with the plate
evaporator until it reaches the front end of the dividing 70 top, side and rear walls 22, 2.4 and Z6 enclosing an upper
below freezing compartment 28 and a lower above freez
members.
ing compartment 3t) separated by a horizontal dividing
Air from the below freezing compartment passes around
3,0 50,9)31
o)
A
to the passages 88 on the outer sides of the dividers along
wall 32. The front of these compartments 28 and 30
the side edges of the evaporator 54. These passages 88
are closed by separate doors 34 and 35 suitably insulated.
are located between the dividers 80 and 86 and the up
These doors seal against the metal covered insulating
mullion 37 at the front of the horizontal dividing wall 32.
turned sides of the drain pan 50.
The ?ow of air from the above freezing compartment
The above freezing compartment 38 is provided with a
341 through the side passages 88 is relatively slow. The
false top wall 34 which is spaced beneath an insulating
air from the openings 48 therefore has ample contact
member 36 extending rearwardly from the mullion 37
with the adjacent surfaces of the evaporator 54 so that it
within the horizontal dividing wall 32. This insulating
is cooled and its moisture largely removed and deposited
member 36 of foamed plastic resin has a projecting por
tion 38 at the front which rests upon the false 'top wall 10 in the form of frost on the adjacent edge portions of the
evaporator 54. Therefore, when the air reaches the front
34 land a front pointing triangular-shaped projection 48
of the evaporator compartment, it is cooled and dried.
at the rear which likewise rests upon the false wall 34.
At the front of the evaporator compartment, this air
Between these projections 38 and 48 is a recessed portion
which has ?owed through the side passages 88 meets the
42 forming two passages which become wider as they
extend forwardly from the rear corners until they join 15 air which ?ows from the below freezing compartment
around the front edge of the false bottom plate 90 which
at the center. The false top ‘wall 34 is provided with a
. rests upon the heater section 72 directly beneath it. This
series of ?ve elongated apertures 44 extending across the
air ?ows between the front edge of the false bottom wall
front providing inlet openings by which air from the above
90 and the front edge of the drain pan 50. All this air
freezing compartment 30 ?ows into the passage 42.- The
then comingles as it ?ows through the central passage 92
false top wall 34 slopes downwardly to the'rear center
located between the dividers 80 and rearwardly ‘between
providing a drain passage 46 in the central portion for
the dividers 86 to the central rear opening 94 provided
the draining of any moisture which may condense on its
upper face. Two passage portions 42 extend to and con
in the false bottom wall 98 as shown in FIGURE 2.
The ?anged opening 94 connects directly with the
wall 26 and thence turn upwardly through the insulating 25 trapezoidal-shaped truncated duct 96 formed of a plastic
verge to the rear corners substantially adjacent the rear
member 36 and connect directly with the two rear corner
openings 48 provided in a drain pan 50 resting upon the
insulating member 36.
The evaporator assembly 52 rests upon the drain pan.
This evaporator assembly includes a folded plate type 30
member which surrounds the scroll 98 of the fan wheel
121 driven by the electric motor 123 lodged within the
recess 125 formed in the rear wall 26.
The scroll 98
evaporator 54 which is shown in development in FIG
includes an inlet 127 providing communication with the
duct 96 and interior of the fan wheel or blower 121.
The scroll 98 includes an upwardly extending discharge
URE 6.
outlet 129 and a downwardly extending discharge out
It includes a narrow entrance passage 56 ex
let 131. The upper discharge outlet 129 is provided with
tending from the center along the rear edge to the right
a semicircular de?ecting collar 133 having a central
end which connects to serpentine passages 58 formed in
the plate terminating in three parallel passages 60 pro 35 opening 135 discharging the central portion of the air
against the bottom. surface of the top wall 22 of the
viding a connection with the opposite side. These three
below freezing compartment 28. The interior passage
parallel passages 60‘ connect with the serpentine passages
137 ‘directs the air downwardly onto the sides and cen
62 which in turn discharge into an accumulator passage
tral portion of the false bottom wall 98‘. This insures
64. A narrow slot 66‘ is cut out between the accumulator
passage 64 and the serpentine passages 62 so that the 40 even distribution of the cold air throughout the below
freezing compartment 28.
accumulator passage may be bent upwardly at a slight
The evaporator 54 is maintained at a temperature of
angle so as to serve as a liquid trap and gas disengage
about -15° C. under the control of a thermostat or
ment chamber. Between the serpentine passages are pro
thermostat bulb 139 located in the fan outlet opening 129
vided openings and louvers 68 extending in the direction
of air ?ow for providing the free passage of air and good 45 so that it is responsive to the temperature of the air
after it has been cooled and dried by passage through
heat transfer between the air and the plate evaporator
the side passages 88 and the central passage 92 in contact
54. These openings and louvers 68 are closely spaced
with the surfaces of the evaporator 54 and the perforated
and extend substantially between the refrigerant passages
ba?le plate 82. This thermostat 139 is preferably set to
so as to provide good air ?ow and good heat transfer
between the air and the louvers providing maximum 50 start operation of the refrigerating system at +2° F.
and a stop operation at —1‘0° F. air temperature. The
turbulence, maximum air flow and maximum heat trans
fan motor 123 and the compressor motor are connected
fer between the air and the refrigerant in the passages 58
in parallel and operate‘simultaneously.
and 62. Retaining tabs or clips 70 are also provided
The downwardly extending outlet 131 connects direct
throughout the evaporator 54 for holding thereon the
serpentine sheathed tubular electric heater 72 extending 55 ly with a discharge connection 141 at the rear of the
evaporator compartment 143 and passes through an open
in serpentine fashion transverse to the serpentine refrig
ing 145 in the insulation member 36 connecting with an
erant passages 58 and 62 throughout the evaporator in
elbow 147 which is connected to the inner sheet metal
cluding a portion extending around the accumulator 64.
member 149 on the front face of the rear wall 26 in
The plate evaporator 54 is bent crosswise substantially
along the line 74 with a rounded bend as is shown in 60 the above freezing compartment 30. This elbow is pro
FIGURE 1 to provide two spaced evaporator portions,
namely, an upper portion 76 and a lower portion 78.
Between the upper and lower portions 76 and 78 are
vided with a threaded connection with a valve seat 151
provided on the opposite side of the face 149 of the rear
wall. This valve seat member cooperates with a valve
element 153 connected by a valve stem to a metal bellows
provided two vertical dividers 88 extending from a point
about one-fourth the distance back of the front edge of 65 155 supported within a plastic housing 157 having a
closed rear wall and perforated side and front walls.
the plate evaporator to the rear. These dividers 80 are
This thermostatic bellows 155 therefore measures the
spaced inwardly from the sides of the plate about one
temperature of the'air in the upper portion of the above
sixth of the folded width of the plate as viewed in FIG
freezing compartment 30 and controls the ?ow of cold air
URE 1. These dividers 80 are held in spaced relation by
‘an intervening central perforated plate 82 located between 70 from the elbow 147 into the compartment 30 so as to
maintain the compartment 38 between 34° and 38° F.
the upper and lower portions 76 and 78 and supported
The bellows 155 is calibrated and is charged with a
by spacers 84. The dividers 80 between the evaporator
sections 76 and 78 are supplemented by the dividers or
suitable volatile liquid so that the valve member 153 will
partitions 86 at the bottom and rear. These dividers 80
close against the seat member 151 at 34° F. and will
and 86 con?ne the air ?owing out of the openings 48 75 move to the fully open position at 38° F. In between
3,050,961
5
6
these temperatures, it will assume intermediate positions
to maintain the above freezing compartment 30 at desired
freezing compartment 30. The plate type of evaporator
provides su?icient turbulence of the air to obtain good
refrigerating temperatures, such as 35° F., for example.
heat transfer between the air and its surfaces. Con
The housing 157 for the bellows 155 is fastened to the
siderable amount of frost can collect on its surfaces with
false top wall 34. A de?ector 158 is located above the 5 out materially affecting the flow of air. The accumula
valve seat 151 to de?ect the air for flow beneath the
tion of frost on its surfaces is substantially uniform and
false top wall 34. As shown in FIGURE 7, the motor
this prevents obstructions to air ?ow and makes the de
compressor unit 159 pumps evaporated refrigerant from
frosting rapid and uniform. This refrigerator is ef?cient
the accumulator as of the evaporator plate 54- and forces
and yet relatively inexpensive to manufacture and also
this compressed refrigerant into the condenser 161 which
prevents any formation of frost in the below freezing
is connected by the capillary restrictor tube 163 with the
compartment 28. The defrosting system automatically
restricted inlet passage as of the plate evaporator 54.
removes frost without any attention of the owner.
Referring now more particularly to FIGURE 7, there
In the form shown in FIGURES 9 and 10, similar
is shown the wiring diagram provided with a supply con
parts to those found in FlGURES 1 to 8 are given the
ductor 165 connecting through a starting relay 167 with 15 same reference characters and the description thereof will
the compresosr motor 169 of a motor-compressor unit.
not be repeated. This form shown in FIGURES 9 and
The starting relay 167 controls the ?ow of current through
10 differs primarily in that the partitions or dividers 80
the phase winding 171 of the motor 169. Also con
and fit’: are omitted and a different air circulating system
nected to the supply conductor T65 is the motor 123
within the evaporator compartment 243 is provided. The
of the fan 121 which is connected in parallel with the 20 false top wall 234 of the above freezing compartment is
motor 169 and in series with the thermostat 139. The
provided with a series of four rows of distributed inlets
thermostat 139 is connected to the contact 173 of a
which extend from side to side across the false top
double throw switch 375 controlled by a defrost timer
wall
They communicate with a recess 242 provided
177. Periodically, such as once a day, the double throw
in the insulation member 236 above the false top wall
switch 175 is moved to its upper position into contact 25 234*. The insulation member 236 is provided with four
with the stationary contact 179. The switch 175 as well
rows of vertically extending passages 245 directly over
as the defrost timer 177 are connected to the second
the openings 244 in the false bottom wall 234 and ex~
tending upwardly from the recess 242 to a recess adjacent
When the defrost timer 177 operates to move the
the apertures Z45. Directly above these holes or pas
switch 175 away from the contact 173 into contact with 30 sages 245 are located the large apertures 248 in the drain
the contact 179, a defrost cycle is initiated. This de
pan 259;. The drain pan 25%)‘ is generally similar to the
energizes the motors 169 and 123 to stop refrigeration
drain pan 5% with the exception of the difference in
supply conductor 131.
and air circulation. It energizes the heater 72 through
a normally closed defrost limiter thermostat 183 located
on the right rear portion of the drain pan as shown in
FIGURES 3 and 5.
The heater 72 rapidly heats the
location of holes. Within the evaporator compartment
21113 is the folded plate type evaporator 254 which is
similar to the evaporator shown in development in FIG
URE 6. However, the plate 82 is omitted but the
evaporator is provided with serpentine sheathed tubular
evaporator 54 and the evaporator compartment 143 so
that the frost is melted and collected by the drain pan for
electric heaters 272 above and below in a manner similar
disposal through a frost Water discharge duct 185 shown
to the first embodiment. The lower section of heaters
in FIGURE 3. The heating continues a sufficient length 40 rest directly on the drain pan 250 while the false bottom
of time to melt the frost. The heating is terminated
wall 50 rests directly on the upper series of the sheathed
when the defrost limiter thermostat 183 reaches a suf?
electric heater 272.
ciently high temperature, such as 40° or 415 °, which in
In this form, operation of the blower or fan 121 causes
dicates the condition insuring completion of the defrost
air to be drawn from the below freezing compartment 28
ing. When this temperature is reached, the limiter ther 45 around the front end of the false bottom wall 90 into
mostat 183 is opened. This, then effectively energizes
the evaporator space 243 where it contacts the front edge
the electromagnet 187 in a shunt circuit around the limiter
of the evaporator 254 initially. Air is also drawn from
thermostat 183. This electromagnet 187 then operates
the above freezint7 compartment 3t} through the holes
the double throw switch T175 back to its normal position
244 in the false top wall 234, through the passages 245
in contact with the contact 173 so that refrigeration can
in the insulation member 236 and through the apertures
be resumed since the switch 139 will be closed by the
in the drain pan 25d to initially contact the bottom
warmer conditions prevailing during the defrost operation.
surface of the lower section of the plate evaporator 254
In the event that the defrost limiter switch 183 fails to
at a point directly above the opening 248. The initial
operate, the switch 175 will be returned to its normal
contact therefore is considerably different and spaced
position by the defrost timer l7 7 .
55 rearwardly from the initial contact of the air from the
Thus, in this form, air is drawn through passages be
tween the insulation member 36 and the false top wall
34 of the above freezing compartment keeping this false
wall 34 at substantially the highest temperature in the
above freezing compartment so that no moisture will col
lect on it. This air ?rst contacts the edges of the evapora
tor so that a substantial portion of its moisture is de
posited in the form of frost as it is cooled by these sur
faces before this air merges with the colder, drier air
below freezing compartment 23. Since the plate evap~
orator 254- is louvered as shown in FIGURES 3 and 6,
the air ?ows freely in contact with the evaporator 254
and is drawn rearwardly, transferring heat and moisture
to the plate evaporator 254 in its passage to the opening
‘1% in the false bottom wall 9t).
The cold air flows up
wardly into the fan or blower 121 in a manner similar
to the first embodiment. The controls of air ?ow and
temperature are similar.
coming from the below freezing compartment 28. The 65 In this form, the warmer moist air from the above
merged air is cool and dry and is further cooled and
freezing compartment 36‘ ?rst contacts the bottom of the
further dried in its rearward movement through the
evaporator 254 at a point behind the front edge of the
central passage 9?. for distribution to the two compart
evaporator and generally in the front half of the evap
ments by the fan and ductwork. This keeps the below
orator 254. This air moves rearwardly and distributes
freezing compartment 23 at a temperature between about 70 its moisture to the rear part of the evaporator 254 so as
0° and 5“ F. and sufficiently dry to prevent substantially
to provide a relatively uniform distribution of frost upon
the formation of any frost therein. The above freezing
the surfaces of the evaporator. The colder, drier air
compartment 30 is kept at a temperature of about 35°
from the below freezing compartment 28 first contacts
by the thermostatically controlled valve 153 which con
the front edge of the upper section of the evaporator 254
trols the rate of air ?ow into and through the above 75 and then the lower front edge and distributes its moisture
8,050,961
'in the form of frost to a greater extent upon the upper
section of the evaporator 254. This type of air move
means extending from said below and above freezing
compartments to said evaporator portion for conducting
air from the below and above freezing compartments to
ment also serves to distribute the frost more uniformly
said evaporator portion, said fan means drawing air from
‘on the surfaces of the evaporator 254 so that clogging
said compartments through said passage means and evap~
of the air passages by frost is diminished and defrosting
orator compartment in heat transfer with said evaporator
can take place rapidly and uniformly. A similar system
portion, and cooling means maintained at temperatures
of control shown in FIGURES 7 and 8 may be used for
substantially as low as the temperature of the air from
this form of the invention. Thus, in both forms of the
said below freezing compartment extending into heat
invention, the air from the two di?erent compartments
contact initially the evaporator in different areas so that 10 transfer with said air passing through said separate inlet
passage means from said above freezing compartment for
the frost is relatively uniformly distributed and the clog
precooiing the air from said above freezing compartment
ging of the air passages is minimized.
prior to joining said below freezing compartment air.
While the embodiments of the present invention as
5. A refrigerator including insulating means enclosing
herein disclosed constitute preferred forms, it is to be
understood that other forms might be adopted.
15 a below freezing compartment and an above freezing
What is claimed is as follows:
compartment, means forming an evaporator compartment
1. A refrigerator including insulating means enclosing
separated from said compartments containing an evap
a below freezing compartment and an above freezing
compartment, means forming an evaporator compartment
separated from said compartments containing an evap
orator portion, means for circulating air from said below
orator portion and having an outlet, fan means having
an inlet connected to said outlet and having discharge
outlet means discharging into said below and above
freezing compartments, separate inlet passage means ex
and above freezing compartments through said evaporator
tenning from said below and above freezing compart
ments to said evaporator portion for conducting air from
tion and in commingling relationship and returning the
the below and above freezing compartments to said
cooled air to said above and below freezing compart 25 evaporator portion, said fan means drawing air from
ments, said circulating means including means for pro
said compartments through said passage means and evap
portioning the circulation of the air to maintain said
orator compartment in heat transfer with said evaporator
below and above freezing compartments at temperatures
portion, and cooling means normally maintained at tem
below and above freezing respectively, and cooling means
peratures substanti l"ly as low as the temperature of said
for precooling said air circulating from said above freez 30 evaporator portion extending into heat transfer with and
ing compartment prior to its commingling with said below
cooling and removing moisture from said air passing
freezing compartment air.
through said inlet passage means from said above freez
compartment in heat transfer with said evaporator por
2. A refrigerator including insulating means enclosing
at below freezing compartment and an above freezing
compartment, means forming an evaporator compart
ment separated from said compartments containing an
evaporator portion, means for circulating air from said
below and above freezing compartments through said
ing compartment by the deposit of frost prior to joining
said below freezing compartment air, and means for
defrosting said cooling means.
'
6. A refrigerator including insulating means enclosing
9. below freezinCT compartment and an above freezing
compartment and door means for access to said compart
evaporator compartment in heat transfer contact with
ments, means associated with said insulating means form
said evaporator portion and in commingling relationship
ing evaporator compartment means separated from said
and returning the cooled air to said above and below
below and above freezing compartments, means for cir
freezing compartments, said circulating means including
culating air from said below and above freezing com
partments through said evaporator compartment means
and returning the air to said above and below freezing
means for proportioning the circulation of the air to
maintain said below and above freezing compartments at
temperatures below and abovefreezing respectively, and 45 compartments, said evaporator compartment means hav
means for removing moisture from said air circulating
from said above freezing compartment while separated
from said below freezing compartment air prior to its
contact with said evaporator portion.
3. A refrigerator including insulating means enclosing
a below freezing compartment and an above freezing
compartment, means forming an evaporator compart
ing separating means arranged to provide a second zone
for air from the above freezing compartment and a ?rst
zone connected with the second to mix the air from said
below and above freezing compartments, an evaporating
means including a ?rst evaporator portion located in
said ?rst zone of said evaporator compartment in heat
transfer with said mixed air from said below and above
freezing compartments and a second evaporator portion
located in said second zone in heat transfer with the air
ment separated from said compartments containing an
evaporator portion and having an outlet, fan means hav
ing an inlet connected to said outlet and having dis
circulating from said above freezing compartment prior
charge outlet means discharging into said below and
to its mixing with said below freezing compartment air.
above freezing compartments, separate inlet passage
7. A refrigerator including insulating means enclosing
means extending from said below and above freezing
a below freezing compartment and an above freezing
compartments to said evaporator portion for conducting
compartment and door means for access to said com
air from the below and above freezing compartments to 60 partments, means associated with said insulating means
said evaporator portion, said fan means drawing air
formmg evaporator compartment means separated from
from said compartments through said passage means and
said below and above freezing compartments, said evap
evaporator compartment in heat transfer with said evap
orator compartment means including a ?rst part contain
orator portion, and means for removing moisture from
mg a ?rst evaporator portion and a second part contain
said air passing through said separate inlet passage means 65 mg a second evaporator portion, means for circulating
from said above freezing compartment prior to joining
air separately from said above freezing compartment
said below freezing compartment air.
7
separately to said ?rst part in heat transfer with said ?rst
4. A refrigerator including insulating means enclosing
evaporator portion and then circulating this precooled
a below freezing compartment and an above freezing
air together with air from the below freezing compart
compartment, means forming an evaporator compart 70 ment through said second part in heat transfer with said
ment separated from said compartments containing an
second evaporator portion and returning the combined
evaporator portion and having an outlet, fan means
air to said compartments, said circulating means includ
having an inlet connected to said outlet and having dis
mg means for proportioning the circulation of the air to
charge outlet means discharging into said below and
maintain said above and below freezing compartments
above freezing compartments, separate inlet passage 75 respectively at above and below freezing temperatures.
3,050,961
10
8. A refrigerator including insulating means enclosing
evaporator compartment between said below and above
freezing compartments, an evaporator extending within
said evaporator compartment, said evaporator compart
a below freezing compartment and an above freezing
compartment and door means for access to said com
partments, means associated with said insulating means
ment having an outlet, fan means having an inlet con
nected to said outlet ‘and having outlet means discharging
forming evaporator compartment means separated from
said below and above freezing compartments, said evap—
into the below freezing compartment and the above freez
ing compartment, said means forming the evaporator com
partment being provided with a portion of said insulating
orator compartment means including a ?rst part contain
ing a ?rst evaporator portion and a second part contain
ing a second evaporator portion, means for circulating
means and a thin wall separating the evaporator and the
air separately from said above freezing compartment 10 evaporator compartment from said above freezing com
separately to said ?rst part in heat transfer with said ?rst
partment with passage means extending between said por
evaporator portion and then circulating this precooled
tion and said thin wall and connecting with and providing
air together with air from the below freezing compart
communication between said above freezing compartment
ment through said second part in heat transfer with said
and said evaporator compartment for conducting air from
second evaporator portion and returning the combined
said above freezing compartment to said evaporator com
air to said compartments, said circulating means includ
partment.
ing means for proportioning the circulation of the air to
12. A refrigerator including insulating means enclos
maintain said above and below freezing compartments
ing ‘a below freezing compartment and an above freez
respectively at above and below freezing temperatures,
ing compartment and door means for access to said on and means for simultaneously defrosting said ?rst and
partments, means‘ associated with said insulating means
second evaporator portions.
forming an evaporator compartment, an evaporator ex
9. A refrigerator including insulating means enclosing
tending within said evaporator compartment, means di
a below freezing compartment and an above freezing
compartment, means associated with said insulating
viding said evaporator compartment into a ?rst common
passage having an inlet for mixed air from the below and
means forming an extensive evaporator compartment, an 25 above freezing compartments extending into contact with
evaporator extending within said evaporator compart
ment, said evaporator compartment having an outlet
adjacent one edge of the evaporator, fan means having
and embracing a ‘first section constituting the greater por
tion of the evaporator and also having an outlet and a
an inlet connected to said outlet and having two outlets
air extending into contact with a second section of the
second passage solely for above freezing compartment
with one of the outlets discharging into the below freez 30 evaporator and embracing one edge of the evaporator and
ing compartment and the second outlet extending to the
connecting at one end with the above freezing compart
above freezing compartment, said means forming the
ment and connecting at the opposite end with said inlet of
evaporator compartment being provided with ?rst pas- '
sage means located to conduct air from said above freez
ing compartment ?rst into contact with one portion of
the evaporator and provided with a second passage means
located in another portion to conduct air from said below
freezing compartment into contact with another portion
of said evaporator and connecting with the ?rst passage
means.
10. A refrigerator including insulating means enclos
ing a below freezing compartment and an above freez
ing compartment, means associated with said insulating
means forming an extensive thin evaporator compartment,
an evaporator extending within said evaporator compart
ment, said evaporator compartment having an outlet ad
jacent one edge of the evaporator, fan means having an
inlet connected to said outlet and 'having outlet means,
discharge means extending ‘from said outlet means to
said below freezing compartment, and conduit means ex
tending from said outlet means to said above freezing
compartment, said means forming the evaporator compart
ment being provided with ?rst passage means located be
yond the edge opposite said‘ one edge of said evaporator
providing communication between said below freezing
compartment and said evaporator compartment for de
livering said below freezing compartment air to said edge
opposite of said evaporator, said means forming the evap~
orator compartment being also provided with separate
said ?rst passage,'said inlet of said first passage also com
municating with the below freezing compartment for re
ceiving
therefrom, and fan means having its inlet con
nected to said outlet of said first passage and having out
let means connected to said above and below freezing
compartments.
13. A refnigerator including insulating means enclos
40 ing a below freezing compartment and an above freezing
‘compartment and door means for access to said compart
ments, means associated with said insulating means form
ing an extensive generally rectangular evaporator com
partment, a generally rectangular evaporator extending
within said evaporator compartment, means dividing said
evaporator compartment into a central common passage
embracing the central portion of the evaporator and hav
ing an inlet and an outlet adjacent opposite edges of the
evaporator and side passages embracing the other edges
of said evaporator and each connected at one end to the
inlet of said central portion and extending at the other
end to one of two corners of said evaporator compart
ment, said insulating means including passages extending
from said above freezing compartment to said two cor
ners of said evaporator compartment, and means for
drawing air from said outlet of said central passage and
‘discharging the air into‘ said below and above freezing
compartments.
_
14. A refrigerator including insulating means enclosing
second passage means located adjacent to and in heat 60 an upper below freezing compartment and a lower above
transfer with the evaporator between said one and said
freezing compartment, a wall separating‘ said compart—
opposite edges and extending therefrom to said edge op
ments including ‘a lower layer of insulation and a laterally
posite, said insulating means being provided with third
passage means extending from said above freezing com—
partment to said second passage means providing in com~
bination with the second passage means for the ?ow of
extending evaporator compartment above the insulation
and a thin laterally extending divider separating the evap
orator compartment and the below freezing compartment,
‘a laterally extending evaporator within said evaporator
compartment, said divider being provided with an inlet
opening and an outlet opening on opposite sides of said
evaporator and communicating with said evaporator com
above freezing compartment air from said above freez
ing compartment through said second passage means into
heat tnansfer with the evaporator between said one and
said opposite edges prior to mixing with said below freez 70 partment, said layer of insulation being provided with
ing compartment air in said ?rst passage means.
passage means extending from said above freezing com
11. A refrigerator including insulating means enclos
partment to said evaporator compartment immediately
ing a below freezing compartment and an above freezing
adjacent to an intermediate portion of said evaporator,
compartment below said below freezing compartment,
fan means having an inlet connected to said outlet and
means associated with said insulating means forming an 75 having outlet means, discharge means extending from said
3,050,961
11
outlet means to said below freezing compartment, and
12
extending evaporator compartment above the insulation
and a thin laterally extending divider separating the evapo
rator compartment and the below freezing compartment,
8. laterally extending evaporator within said evaporator
compartment, said divider being provided with an open
an upper below freezing compartment and a lower above
ing at the front in front of the evaporator providing for
freezing compartment, a wall separating said compart
the flow of air from the below freezing compartment to
ments including a lower layer of insulation and a laterally
the front of the evaporator compartment, said layer of
extending evaporator compartment above the insulation
insulation being provided with passage means rearwardly
and a thin laterally extending divider separating the evapo
rator compartment and the below freezing compartment, 10 of the front of the evaporator extending from the above
freezing compartment to a portion of said evaporator
a. laterally extending evaporator within said evaporator
compartment rearwardly of the front of the evaporator
compartment, said evaporator compartment being pro
conduit means extending ‘from said outlet means to said
above freezing compartment.
15. A refrigerator including insulating means enclosing
vided with an inlet adjacent the front of the below freez
ing compartment and an outlet adjacent the rear of the
so as to contact ?rst a different portion of the evaporator
than is contacted ?rst by the air from the below freezing
below freezing compartment, said layer of insulation 15 compartment, fan means having an inlet connected to
the rear of said evaporator compartment behind said
being provided with passage means extending from said
evaporator and having two outlets with one of the outlets
above freezing compartment to said evaporator compart
discharging into the below freezing compartment and the
ment immediately adjacent to an intermediate portion of
second outlet discharging into the above freezing com
said evaporator, fan means having an inlet connected to
said outlet and having two outlets with one of the outlets 20 partment.
18. A refrigerator including insulating means enclosing
discharging into ‘the below freezing compartment and
a below freezing compartment and an above freezing
the second outlet discharging into the above freezing
compartment, means associated with said insulating means
compartment.
forming an extensive thin evaporator compartment, an
16. A refrigerator including insulating means enclosing
evaporator extending within said evaporator compartment,
at below freezing compartment and an above freezing
said evaporator compartment having an outlet adjacent
compartment, means associated with said insulating means
forming an extensive thin evaporator compartment, an
evaporator extending within said evaporator compartment,
one edge of the evaporator, fan means having an inlet
connected to said outlet and having two outlets with one
one edge of the evaporator, fan means havingan inlet
of the outlets discharging into the below freezing com
partment and the second outlet extending to the above
connected to said outlet and having two outlets with one
freezing compartment, means dividing said evaporator
of the outlets discharging into the below freezing corm
partment and the second outlet extending to‘the above
freezing compartment, said means forming the evaporator
compartment into a common passage for both below and
compartment being provided with ?rst passage means at
the front extending from the front of the below freez
ing compartment to the front of the evaporator compart
ment in front of the evaporator, said means forming the
of the fan means and a second separate passage solely for
said evaporator compartment having an outlet adjacent
above freezing compartment air extending into heat trans
fer with a major portion of said evaporator to the inlet
above freezing compartment air extending‘ into heat trans—
fer with another portion of said evaporator to said
common passage for cooling and drying the above freezing
compartment air prior to its joining with said below
evaporator compartment being provided with bottom pas
sage means extending from the top of the above freezing 40 freezing compartment air in said common passage, said
means forming said evaporator compartment being pro
compartment to the bottom of said evaporator compart
vided with passage means extending from said below
ment rearwardly of the front of the evaporator, said means
freezing compartment to said common passage prior to
forming the evaporator compartment also including a
third passage ‘means extending from said ?rst passage 45 the heat transfer with said evaporator.
means rearwardly in contact with said evaporator to said
References Cited in the ?le of this patent
outlet.
UNITED STATES PATENTS
17. A refrigerator including insulating means enclosing
an upper below freezing compartment and a lower above
freezing compartment, a wall separating said compart
ments including a lower layer of insulation and a laterally
2,180,974
2,730,867
2,907,180
Atchison ____________ __ Nov. 21, 1939
Salisbury ___________ __ Jan. 17, 1956
Mann _______________ .. Oct. 6, I959
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