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Патент USA US3023599

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March 6, 1962
3,023,589
J. w. JACOBS
REFRIGERATING APPARATUS
Filed NOV. 16, 1959
“Fig.1;l,
IO
40
3O
IN VEN TOR.
101W wagMW.s.
w
H
S.
[m
3,923,589
Patented Mar. 6, 1962
1
2
3,023,589
compressor 10 whenever the temperature of the evaporator
16 falls below —6° F.
A defrost control thermostat assembly 24, which in
cludes a temperature sensing bulb 26 is arranged to sense
the temperature of the accumulator 18. The thermostat
REFRIGERATING APPARATUS
James W. Jacobs, Dayton, Ohio, assignor to General Mo
tors Corporation, Detroit, Mich., a corporation of
Delaware
Filed Nov. 16, 1959, Ser. No. 853,084
7 Claims. (Cl. 62-156)
assembly serves to actuate the switch 28 so as to deener
gize the compressor 10 when the temperature of the ac
cumulator drops below —6‘’ F. At this temperature, the
switch 28 moves from its full line position, shown in
more particularly to a household refrigerator having an 10 FIGURE 3, to the dotted line position, in which latter
improved defrost control system.
position a circuit is closed to an electric heater 30 ar
It is an object of this invention to provide a defrost con
ranged in thermal exchange relationship with the evapo
trol which eliminates the need for a time clock or the like
rator 16 so as to cause defrosting of the evaporator. The
for periodically initiating the defrost cycle.
switch 28 remains in its dotted line position until the tem
This invention relates to refrigerating apparatus and
More particularly, it is an object of this invention to 15 perature of the accumulator 18 reaches 50° F., at which
provide a refrigerating system which is so designed that
time, the circuit to the electric heater is opened by the
changes in the temperature of an accumulator located at
switch 28 and the circuit to the motor compressor unit 10
the outlet of the evaporator can be utilized for initiating
is reestablished.
a defrost cycle.
Reference numeral '40 designates an electric motor
Further objects and advantages of the present inven 20 which serves to operate a condenser fan 42 and an evapo
tion will be apparent from the following description, '
reference being had to the accompanying drawing wherein
rater fan or blower 44. As indicated in FIGURE 3 of
the drawing, the motor 40 is connected in parallel with
a preferred embodiment of the present invention is clearly
the compressor motor 10 so as to operate in unison with
shown.
the compressor 10.
In the drawing:
25
As indicated in FIGURE 1 of the drawing, the evapo
FIGURE ‘1 schematically shows a household refriger
rator 16 serves to refrigerate air for both the frozen food
ator embodying my invention.
storage compartment 7 and the above freezing food stor
FIGURE 2 is a schematic view of the refrigerant cir
age'compartment 6. The quantity of air circulated and
cuit shown in FIGURE 1.
the temperature of the air leaving the evaporator 16 is
FIGURE 3 shows a circuit diagram for the electrical 30 su?icient to maintain the contents of the frozen food
controls.
storage compartment 7 free of frost at all times. Any
Referring now to the drawing wherein a preferred em
‘frost which might form momentarily in the food storage
bodiment of the invention has been shown, reference num
compartment is removed by the process of sublimation in
eral 5 designates the cabinet of a household refrigerator
accordance with well known principles.
35
having anabove freezing temperature food storage com
Whenever the compressor 16] is deenergized either by
partment 6, at below freezing food storage compartment 7,
a machinery compartment 8, and an evaporator compart
ment 9.
I
virtue of opening of the switch 28 or switch 32, the
fan 44 will stop operation so as to avoid circulation of
warm air through the frozen food compartment 7.
The refrigerating system includes a conventional sealed
For purposes of illustration there is shown a cabinet
motor compressor unit 10' which is adapted to compress 40
in which the refrigerated air is circulated upwardly from
the refrigerant vapor and to discharge the compressed
the evaporator compartment 9 through an air duct located
,vapor into a condenser 12 wherein the refrigerant is con
adjacent the rear of the compartments 6 and 7 and a
,verted into a liquid before entering a capillary tube re
corresponding amount of air is returned to the inlet of
strictor 14. The outlet of the capillary tube 14 is con
the evaporator blower 44 through the return air duct
nected to an evaporator 16 which serves to cool the air 45
Which is provided with return air inlets 64» and 66 which
for the compartments 6 and 7 in a manner to be ex
for purposes of illustration have been shown as located
plained more fully hereinafter.
in the sidewalls of the compartments 6 and 7, respec
The design of the refrigerating system and the quantity
tively.
of refrigerant placed in the system is such that during
The temperature of the compartment 6 can be closely
normal operating conditions, all of the liquid refrigerant 50 ,regulated
by means of a damper 52, which is arranged
becomes vaporized in the evaporator 16 before returning
at the outlet of the refrigreated air supply duct, as shown.
to the compressor 10. It has been found that an excessive
This damper is controlled in response to changes in tem
accumulation of frost on the evaporator 16 causes its
perature of the thermostatic bulb 54 located in the com
heat absorbing characteristics to be altered so that it op
partment 6 through the action of the damper actuator
erates at a lower temperature than normal. When the 55 bellows 56. The thermostat 54 is preferably designed to
evaporator temperature is thus lowered, the quantity of
maintain the temperature in the compartment 6 approxi
liquid refrigerant in the evaporator increases to a point
mately between 35° F. and 40° F. The quantity of air
where some of the liquid refrigerant spills over into the
and the temperature of the air admitted into the frozen
food compartment 7 is preferably such that the tempera
accumulator 18 located at the outlet of the evaporator.
60 ture in this latter compartment is maintained between
When this takes place, the temperature of the accumulator
approximately —5° F. and +5 ° ‘F. The temperature
18 drops in temperature and this drop in temperature is
values given herein are given for purposes of illustration
used to initiate a defrost cycle.
and may be varied to suit speci?c requirements.
Under normal operating conditions the compressor 10
While the embodiment of the present invention as here
is cycled by means of a thermostat assembly 261 which in 65
in disclosed constitutes a preferred form, it is to be under
cludes a temperature sensing bulb 22 arranged in thermal
exchange relationship with the evaporator 16.
This
stood that other forms might be adopted.
What is claimed is as follows:
thermostat assembly is adapted to close the switch 32 so
1. In a refrigerator, the combination, a cabinet having
as to energize the compressor 10 whenever the temperature
a
pair of refrigerated food storage compartments, a
of the evaporator 16 exceeds a temperature of 12° F. and 70
refrigeration system for cooling said compartments, said
is adapted to open the switch 32 so as to deenergize the
refrigerating system comprising an evaporator, a com
3,023,589
3
pressor, a condenser, and refrigerant ?ow connections be
tween said evaporator, compressor and condenser, said
refrigerant flow connections including an accumulator at
the outlet of said evaporator, circuit means controlling
the operation of said compressor, a blower circulating air
for at least one of said compartments in thermal exchange
relationship with said evaporator, said circuit means in~
cluding a first thermostatically operated switch means re
SpOnsiVe to refrigeration requirements for starting and
4
operation of said compressor and said blower; said circuit
means including a ?rst thermostatically operated switch
means responsive to refrigeration requirements for start
ing and stopping said compressor and said blower and a
second thermostatically operated switch means responsive
to the temperature of said accumulator for deener'gizing
said compressor in response to a predetermined decrease
in temperature of said accumulator; means for defrosting
said evaporator; said second thermostatically operated
stopping said compressor, a second thermostatically 10 means including means for initiating operation of said
defrosting means in response to a predetermined decrease
operated switch means responsive to the temperature of
in temperature of said accumulator; damper means for
said accumulator for deenergizing said compressor in re
varying the ratio of air circulated by said blower to each
sponse to a predetermined decrease in temperature of said
of said compartments.
accumulator, means for defrosting said evaporator, said
5. In combination; a cabinet having a pair of refrig
second thermostatically operated switch means including 15
erated
food storage compartments, an evaporator com
means for initiating operation of said defrosting means in
partment and a condensing compartment; a refrigeration
response to a predetermined decrease in temperature of
system comprising ‘an evaporator in said evaporator com
said accumulator.
partment, a compressor and a condenser in said con
2. In a refrigerator, the combination; a cabinet having
densing compartment, and refrigerant flow connections
a refrigerated food storage compartment; a refrigeration
between said evaporator, compressor, and condenser; said
system comprising an evaporator, a compressor, a con
refrigerant ?ow connections including an accumulator at
denser, and refrigerant ?ow connections between said
the outlet of said evaporator; means including a blower
evaporator, compressor and condenser; and refrigerant
‘for circulating air in thermal exchange relations-hip with
?ow connections including an accumulator at the outlet
said evaporator and for discharging said air into said food
of said evaporator; circuit means controlling the operation 25 storage
compartments; circuit means for controlling the
of said compressor; said circuit means including a ?rst
operation of said compressor and said blower; said cir
thermostatically operated switch means responsive to
cuit means including a ?rst thermostatically operated
refrigeration requirements for starting and stopping said
means responsive to refrigeration requirements for
compressor and a second thermostatically operated switch 30 switch
starting and stopping said compressor and said blower
means responsive to the temperature of said accumulator
and a second thermostatically operated switch means re
for deenergizing said ‘compressor in response to a pre
sponsive to the temperature of said accumulator for de
determined decrease in temperature of said accumulator;
energizing said compressor in response to a predetermined
and means for defrosting said evaporator; said second
in temperature of said accumulator; means ‘for
thermostatically operated switch means including means 35 decrease
defrosting said evaporator; said second thermostatically
for initiating operation of said defrosting means in re
operated means included'means for initiating operation of
sponse to a predetermined decrease in temperature of said
said‘ defrosting means in response to a predetermined de
accumulator and for reenergizing said compressor in re
crease in temperature of said accumulator; damper means
sponse to a predetermined increase in temperature of said
for varying the ratio of air circulated by said blower ‘to
accumulator.
’
each of said compartments; ‘and’ a thermostat responsive
' 3. In combination; a cabinet having a pair of refrig
to the temperature in one of said compartments con
erated food storage compartments, an evaporator com
trolling said damper means.
partment and a condensing compartment; a refrigeration
6. In a refrigerator, the combination, a cabinet having
system comprising an evaporator in said evaporator dom
a pair of refrigerated food storage compartments, a ‘re
partment, a compressor and a condenser in said condens
frigeration system for cooling said compartments, said re
ing compartment, and refrigerant flow connections be
frigerating system comprising an evaporator, a compres
tween said evaporator, compressor, and condensor; said
sor, a condenser, and refrigerant ?ow connections be
refrigerant flow connections including an accumulator at
tween‘ said evaporator, compressor ‘and condenser, said
the outlet of said evaporator; a blower for circulating air
refrigerant flow connections [including a conduit leading
to be refrigerated in thermal exchange relationship with
50 from the outlet of said evaporator to said compressor,
said evaporator; circuit means for controlling the opera
circuit means controlling the operation of said compres
tion of said compressor and said blower; said circuit
sor, a blower’ circulating air for‘ at least one of said
means including a ?rst thermostatically operated switch
compartments in thermal exchange relationship with said
means responsive to refrigeration requirements for start
ing and stopping said compressor and said blower and a 55 evaporator, said circuit means including a ?rst thermo
statically operated switch means responsive to the tem
second thermostatically operated switch means responsive
‘to the temperature of said accumulator for deenergizing
perature produced by said evaporator for starting and
said compressor in response to a predetermined decrease
in temperature of said accumulator; means for defrosting
stopping said compressor, a second thermostatically oper
ated switch means responsive to the temperature of said
said evaporator; said second thermostatically operated
conduit for deenergizing said compressor in response to a
means including means for initiating operation of said de—
frosting means in response to a predetermined decrease in
predetermined decrease in temperature of said conduit,
means for defrosting said evaporator, said second thermo
temperature of said accumulator.
4. In combination; a cabinet having a pair of refrig
statically operated switch means including means for ini
tiating operation of said defrosting means in response to
erated food storage compartments, an evaporator com 65 a predetermined decrease in temperature of said conduit.
partment and a condensing compartment; a refrigeration
7. In a refrigerator, the combination; a cabinet hav
system comprising an evaporator in said evaporator com
ing a refrigerated food storage compartment; a refrigera
partment, a compressor and a condenser in said condens
tion system comprising an evaporator, a compressor, a
ing compartment, and refrigerant ?ow connections be
tween said evaporator, compressor, and condenser; said 70 condenser, and refrigerant ?ow connections between said
evaporator, compressor and condenser; said refrigerant
refrigerant ?ow connections including an accumulator at
the outlet of said evaporator; means including‘ a blower
?ow connections including an accumulator at the outlet
of‘said evaporator; circuit means controlling the opera
‘for circulating air in thermal exchange relationship with
tion
of said compressor; said circuit means including a
said evaporator and for discharging said air into said food
storage compartments; circuit means for controlling the 75 ?rst thermostatically operated switch means responsive to
5
3,023,589
refrigeration ‘requirements for starting and stopping said
compressor and a second thermostatically operated switch
means responsive to the temperature of said accumulator
for deenergizing said compressor in response to a prede
termined decrease in temperature of said accumulator; 5
and means energized by said second thermostat for de
frosting said evaporator; said second thermostatically op
erated switch means including means for initiating oper
ation of said defrosting means in response to a predeter
mined decrease in temperature of said accumulator.
10
6
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,595,967
2,687,620‘
2,792,691
2,847,190‘
2,863,303
2,907,180
2,912,834
McCloy ______________ __ May 6,
R-aney ______________ __ Aug. 31,
Murphy et a1. ________ __ May 21,
Slattery _____________ __ Aug. 12,
1952
1954
1957
1958
Wurtz _______________ __ Dec. 9, 1958
Mann ________________ __ Oct. 6, 1959
Mann ______________ __ Nov. 17, 1959
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