close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2133954

код для вставки
Oct. 25, 1938.~
|_. B. M. BUCHANAN
2,133,954
REFRIGERATING APPARATUS
Filed June 26, 1936 -
WIT ESSES:
'
F IG’ 4"
.
'
F'a'a'
INVENTOR
Lssu: B.M.BucHn~/a~.
BY 7/ "
'
ATTORNIéY
Patented Oct. 25, ‘1938 _
_- . ‘2,133,954
UNITED STATES PATENT, orrlcs
2.133.954
'
BEFBIGEBATING ‘APPARATUS
Leslie B. M. Buchanan, Spring?eld, Mala, as‘
slgnor to Westinghouse Electric & Manufac
turing Company, East Pittsburgh, Pa., a- cor
poration of Pennsylvania
Application June 2c, 1936, Serial _No. 81,424
19 Claims.‘ ‘(Cl- lit-4)
My invention relates to refrigerating ‘appa
ratus of the type employing a plurality of'evapo
rator elements operated at dl?erent mean tem
peratures and has for an object to provide im
5 proved apparatus of this character.‘
'
A further object of the invention is to'provide
I an improved domestic type ‘refrigerator and
method of refrigeration wherein ?uids may be
more rapidly congealed than in prior apparatus
10. of this kind.
‘
-
'
A still further object of the invention is to
effect quick freezing of water or other ?uids in a
conventional refrigerator cabinet without depres
sing the temperature of the food storage com
16 partment to an undesirable degree and without
excessively dehydrating the air therein.
A further object of my invention is to refriger
ate one element of. a refrigerating system to a
relatively low temperature, prior to the refrigera
20 tion of a second element at a higher temperature
during each cycle of the system.
These and other objects are eifected by my in
~ :vention, as will be apparent from the following
description and claims taken in connection with
'25 the accompanying drawing, forming a part of
this application, in which:
tion, while effective, is expensive. My invention
may be applied to-a cabinet construction such as
this, but may'a'lso be applied to the less expen
sive type of construction wherein a single insu
lated food storage compartment is employed 5
with a unitary refrigerating element for effecting
the refrigeration of both the food products‘ and
the ?uid to be congealed.
-
_
In practicing my invention, an evaporator
structure may be disposed in a single compart- 10
ment of the refrigerator which structure may
take the outward appearance of a conventional,
evaporator. The walls of the evaporator struc
ture and freezing trays de?ne relatively high and
low temperature evaporator elements. The walls 15
are arranged in heat exchanging relation with
the air in the compartment and the shelves are ' '
disposed within the walls and are shielded there
by from the air within the compartment.
'
.
In accordance with my invention, a conven- 20
tional refrigerant condensing unit circulates re- .
frigerant through the evaporating elements, pref
erably in series, so that refrigerant flows through
the shelves and thence through the walls. Va
porized refrlgerantiis withdrawn from the walls. 25 _
A reservoir for the storage of condensed refriger
Fig. 1 is a sectional view of a portion of a do- ,' ant is connected to the shelves and walls,'pref
mestic refrigerator having my improved refrig
erating apparatus applied thereto;
30
Fig. 2 is a- view of a detail of Fig. 1 shown in a
diii'erent operating position;
‘erably between these elements. The purpose of
the ‘reservoir is to store more or less condensed
refrigerant‘, so that it may or may not be deliv- so ,
ered to the. wall members for vaporization there- _
Fig. 3 is a section of the detail shown in Fig.2 in. A thermostatically operated device respon
and is taken along the line III--III of Fig. 1; and, - sive to the temperature of the refrigerant d'eliv~‘
Fig. 4 is a modified view of some of the details ered to the reservoir by the shelves or low tem
35 shown in Fig. 1.
'
evaporator element, controls the storage 35
In prior refrigerating machines of the domestic perature'
of refrigerant in the reservoir. .
type having a food storagecompartment and a ‘ The circulation of refrigerant is preferably
common evaporator therein for cooling the air controlled
in response to the temperature of the
in the compartment and for freezing ?uids, quick walls or high
temperature element. When the
40 freezing of the latter without excessively dehu
walls
attain
a
predetermined high temperature, 40
midifying and cooling the air in the compartment refrigerant is delivered
to the shelves and thence
has been di?lcult. If the temperature of the to the reservoir. At this
time, refrigerant is
evaporator is maintained at a desirable value for stored in the reservoir due to the relatively high
cooling the food in the compartment. then con
temperature of the refrigerant ‘therein. so that no
45 gealing'of ?uids is slow and, if the temperature ‘refrigerant is delivered for vaporization in the 45
of the evaporator is lowered to eii'ect quick‘ con
members.v when the shelves are depressed
gelatlon, then excessive cooling of the food and' wall
to
a
low temperature. the, thermostatic control
dehydration of the same is experienced.
in the reservoir discharges the stored refrigerant,
To obviate this undesirable condition, it has to the walls for vaporization‘ therein. As the
50 been proposed ‘to supply different compartments temperature of the latter is depressedfto the de- 50
I for food cooling and for congealing of fluids or sired value, the’condensin'g unit is stopped and
freezing of water. Separate evaporator elements ‘refrigeration of both elements is terminated.
are provided for the respective compartments‘,
During the inactive periods of the condensing
which evaporators operate at different tempera
unit,
the thermostatic device in the reservoir
55 tures suitable for these purposes.
construc- .
operates at a predetermined temperature to con- “
2,183,954
dition the reservoir for storage of refrigerant pressor mechanism 3|. The mechanism 3| with
therein. Thereafter, when the condensing unit draws vaporized refrigerant from the header l9
through a conduit 32 and compresses it to a rel
is started at a predetermined higher tempera
ture, the cycle is repeated. Accordingly, when ‘ atively high value for delivery through a con
the condensing unit starts, the shelves are ?rst duit 33 to a condenser shown diagrammatically
refrigerated to a relatively low temperature and, at 34. Cooling of the condenser 34 is effected in
thereafter, the walls are refrigerated to a rela
tively higher temperature.
'
Reference will now be had to Fig. 1 of the
10 drawing which discloses refrigerating apparatus
constructed in accordance with one form of my
invention applied to a conventional cabinet ||l
having a compartment | | for the storage of arti
any suitable manner for lique'fying the com
pressed vapor. Condensed refrigerant is deliv
ered to the conduit 21 through a suitable pres
sure reducing device such as a conventional high 10
side ?oat valve 35. The operation of a system of
the compressor-condenser-expander cycle is well
known and no'description thereof is deemed nec
cles to be refrigerated. A refrigerant evaporat
15 ing structure, generally indicated at I2, is dis
posed within the compartment “ for cooling the
air‘ therein and for ?uid congealing purposes
such as, for example, the freezing of water. The
structure |2 includes side walls l3 and I4 that
20 are provided with spaces l5 and I6, respectively,
for refrigerant. A bottom wall |1 connects the
bottoms of the side walls l3 and I4 and may or
may not be refrigerated. A passage IB is dis
closed in the bottom wall H for conducting re
25 frigerant from the wall |3 to the wall M. The
upper portion of the wall |4 includes a header l9
from which refrigerant vaporized in the struc
ture I2 is withdrawn.
The evaporating structure |2 may be sus
30 pended in the compartment ||, preferably by ex
tensions 20 of the Walls l3 and H. The side and
essary.
e
The motor compressor mechanism 3| is ener
gized by electrical line conductors L1 and La con
trolled by a thermostatic switch 36 preferably re
sponsive to the temperature of the wall I4. I dis
close a thermostatic switch 36 of the expansible
gas type, but it will be understood any suitable
thermostatically operated switch may be em
ployed. As shown, the switch 36 includes a tem
perature-responsive element 31 secured to the
wall |4 adjacent the header [9. As the operation
of gas type thermostatic switches is well known, 25
no detailed description of the operation will be
given other than to state that the switch is closed
at a relatively high temperature of the wall l4
and is opened at a relatively low temperature’
30
thereof.
bottom walls de?ne ‘a chamber 2| therebetween
which may be closed at the back by a rear wall
22. The rear wall 22-is connected to the side
35 walls l3 and I4 and preferably extends from the
_ bottom wall H to the top of the extensions 20.
The front of the chamber 2| may be closed by a
door (not shown) in a well understood manner.
Arranged within the chamber 2| are shelves 23
In accordance with my invention, means are
provided for reducing the temperature of the
shelves 23 and 24 to a relatively low degree each
time the compressor mechanism 3| is operated to
effect cooling of the walls I3 and I4 and, there 35
fore, the air within the compartment II. This
operation is effected by, first, evaporating re
frigerant in the shelves and. subsequently, ef
fecting evaporation in the walls.
_
'
The means for accomplishing this operation in
40 and 24 having respective passages 25 and 26
formed therein for refrigerant. A conduit 21 is
employed for conducting condensed refrigerant
cludes a structure 40 that de?nes a reservoir 4|
to the shelf passage 25 and a conduit 28 provides
communication between the shelf passages 25
45 and 26. These connections provide for series
?ow of refrigerant through the shelves 23 and
24, but it will be understood that other methods
refrigerant from the shelf passage 28 to the res
ervoir 4| and a second conduit 43 provides com
of conducting refrigerant through the shelves
may be employed. Trays 29 may be supported
‘by the shelves for the fluid to be congealed or
50
frozen.
The walls l3 and I4 de?ne an evaporating ele
ment that is maintained at a mean temperature
suitable for refrigerating the air within the com
55 partment | | to a temperature value that is opti
mum for the storage of food. This value is sum
ciently low for proper cooling of the air and high
enough to prevent excessive dehydration there
of. The shelves 23 and 24 de?ne an evaporating
60 element that is maintained at a lower mean tem
perature than the walls l3 and I4, so that faster
freezing of ?uid in the'trays 29 is obtained than
would be obtained at the higher mean wall tem
.
perature.
,The air within the compartment II is shielded,
substantially, by. the various walls of the struc
ture |2 from the relatively low temperature pre
vailing in the chamber 2| so that its temperature
or vapor content is not affected to any mate
70 rial degree by the relatively cold air in the cham
ber 2|.
‘
Refrigerant is circulated through the shelves
and walls of the evaporating structure |2 by any‘
suitable refrigerating machine such as, for exam
75 ple, a hermetically sealed motor driven com
40
for storing variable quantities of condensed re
frigerant (Figs. 1 to 3, inclusive). A conduit 42 is
provided for conducting condensed and vaporous
45
munication between the reservoir 4| and the pas
sage |5 of the wall l3. The latter conduit 43 de
?nes an over?ow device and‘ may extend up
wardly in the reservoir a predetermined distance 50
for determining the maximum depth and quan
tity of refrigerant to be stored therein, as shown
in Fig. 1.
An inverted cup 44 is disposed coaxially with
the conduit in» telescopic relation and is support 55
ed by a thermostatic member or disc 45._ The
latter may be of bi-metal construction with the
high expansive metal on top, so that, when it is
relatively warm, it is in the position shown in
Fig. 1, and, when cooled, it snaps to a position in 60
which it is curved in the opposite direction to
that shown. Accordingly, the cup 44 is lowered
into the refrigerant as shown in Fig. 2, whereby
the depth and quantity of the refrigerant in the
reservoir 4| is reduced as described hereinafter. 65
The disc 45 may be supported in any suitable
manner as by lugs 45 formed within the reservoir
structure 40.
"‘
The discharge end of the conduit 42 is disposed
adjacent the thermostatic disc 45 whereby refrig 70
erant entering the reservoir structure 4|! ?ows in
heat-exchanging relation over the disc 45 and
then drops to the reservoir 4 | . The disc 45, there
fore,lis operated in response-to the temperature
of the refrigerant entering the reservoir. 4|. 75
2,133,954
When this temperature is at a relatively high
value, the disc 45' is in its upper position and the
maximum quantity of refrigerant, as determined
by the elevation of the open end‘ of the over?ow
conduit 43, is stored in the reservoir 4|. When
the temperature of the refrigerant entering the
reservoir 4| is at a relatively‘ low value, the disc
45 snaps downwardly to the position shown in
Fig. 2 and the cup assumes a lowered position in
10 which it is telescoped with the conduit 43.
As
the cup 44 is of larger inside diameter than the
outside diameter of the conduit 43, an annular
passage is de?ned therebetween, which passage
provides communication between the reservoir 4|
..
15
and the conduit 43.
The conduit 43 is connected to the suction of
the compressor unit 3| through the walls l3 and
I4, so that a lower-pressure prevails in the con
duit 43 than in the reservoir 4|. Condensed re
20 frigerant will, therefore, rise in the annular pas-_
sage between the cup 44 and the conduit 43 and
over?ow into the latter until the level of the
3
‘
the structure with heat insulation (not shown). I
In any event, the cooling e?ect of the evaporation .
in the reservoir 4| is confined to the air in the
chamber 2| containing the trays 29.
-
I
During this operation, the temperature of the
shelves 23 and 25 is depressed with little reduc
tion in temperature of the walls‘ l3 and I4. As
the temperature of the refrigerant contacting the
bimetal disc 45 reaches a. low value of 10 degrees,
for example, the disc 45 and cup 44 snap down
wardly, as shown in Fig. 2, the refrigerant level in
1'0
the reservoir descends; ‘the out?owing condensed
refrigerant ?lling the wall passages l5 and IE
to a level shown in dotted lines in the header
l9. Evaporation is immediately effected in the
wall passages l5 and I6 for cooling the air in the
food compartment ||. _
15 '
>
As refrigeration of the walls _is initiated, the
pressure-and temperature of the refrigerant in
the low side of the system rises due to the rapid 20
evaporation obtaining in the wall passages; Ac-' '
cordingly, as the walls are cooled, the tempera
condensed refrigerant in the reservoir 4| is de ‘ture of the refrigerant in the shelves rises to a
pressed slightly below the bottom of~the cup. 'value of 18 degrees, for example. As operation
25 This level determines the minimum depth and
of the compressor unit 3| continues, both the 25
quantity of refrigerant stored in the reservoir 4|.
At this time, the walls l3 and H are ?lled with
refrigerant, the level of which is indicated by the
‘dot and dash line in the headersIS. _(Fig. 1.) , -
30
When the maximum quantity of refrigerant
is stored in the reservoir (Fig. 1) the walls l3
shelves and wall are depressed in temperature to
a value of say 16 degrees at which the thermo
static switch 36 operates to terminate operation
of the unit 3|. The inactive portion of the cycle
then follows.
'
I
'
. As the temperature of the refrigerant in the
are devoid, substantially, of condensed refrigerant , reservoir 4| increases to 25 degrees, the disc,“
so that evaporation is e?ected only within the ‘snaps upwardly to condition the reservoir‘ for I
shelves 23 and 24. When the reservoir contains storage _of refrigerant when operation of ‘the
35 its minimum quantity of refrigerant, the walls l3
compressor unit 3| is started, which operation is
and I4 contain ‘condensed refrigerant in an
amount represented by the difference in quantities
of refrigerant stored by the reservoir and evapo
ration at this time is eifected in the wall mem
bers l3 and I4.
‘
Operation
.
The position of the apparatus, as shown in the
drawing, is that which prevails during the inac
tive period of the condensing unit and just prior
45 to the starting thereof. At such times, the cup 44
effected when the temperature; of the wall |4
rises to 29 degrees.
1
-
_ From the foregoing, it will be apparent that
the shelves are operated at a lower mean tem
'_perature than the wall members; the former op
erating in the example recited between 29 de
grees and 10 degrees and the wall members‘be-g
tween 29 degrees and 16 degrees. By reducing
the shelves .to-the relative low temperature of 10'
degrees each time the system is cycled, fast
freezing or congelation of substances in the trays
and disc 45 are raised, as the temperature of the
refrigerant in the reservoir 4| is above the value - is effected. As the walls are operated at a higher
minimum temperature or 16 degrees, and since.
at which the disc snaps upwardly, said value be
ing, for example, 25° F. When the temperature of , the walls shield ‘the shelves, it will be apparent
50 the wall |4 rises to a predetermined value of less dehydration of 'the air in the compartment
29° F.,'for example, the thermostatic switch 35 “is obtained in my system than in conventional
closes for initiating operation of the motor com- . systems wherein the walls and shelves 'are op
pressor unit 3|.
erated at substantially the same lower tempera
_
Condensed refrigerant from the condenser
55 passes to the shelves?23 and 24 through the ?oat
valve .35 and is vaporized in the shelves for ab
stracting heat from the material in the trays 29
in a well understood manner. Excess condensed
refrigerant passed to the shelves, of course, passes
60 through conduit 42 and, after contacting the disc.
45, collects in the reservoir 4|. Vaporous refrig-_
erant from the shelf passages 25 and 26” passes
through the conduit 42, the reservoir structure 40,
“conduit 43, passages |3_.|8 and I6 of the walls
to the header I9 and thence to the compressor
unit 3| through conduit 32. Refrigeration is
now effected in the shelf passages .25 and 26 by,
_ evaporation and no cooling is‘eifected by-evapora
tion in the wall passages l5 and I8. Some cooling
70 of the walls l3 and I4 will be?e?ected but it isirela
tures.
'
\
'.
'
-
=
'
Fig. 4 discloses a-second embodimentof the
arrangement of the reservoir in the evaporator
structure.“ In this embodiment, the separate res- ‘
ervoir structure 4.0 of Fig. 1 is replaced’by a struc
tum-5t formed at the top of the wall |3.- The
operation ofv the two embodiments is similar so
that no further description is necessary and parts
which may be common to both are indicated by
like numerals in bothi?gures of the -drawing._
In Fig. 4, however, -I have shown heat insula
tion 5| disposed on the side of the reservoir 5,.
ythat is exposed to the air in. the compartment H.
The ‘insulation is employed forvrestrictingithe
flow of heat to the reservoir structure 50 from the ‘
air in the compartment | I during periods when
the shelves onlyare refrigerated, at which time 70'
I tively small, the amount of heat abstracted from‘ ‘the reservoir structure 50 would assume, substan- >
the walls being only that added to therei'riger
ant vapor as superheat.
~
j
'
tially, the relatively ' low temperature of the
she was
I
.
Some evaporation is effected in‘ the reservoir
lie I have disclosed, my improved apparatus
structure 40, but this may be reduced by covering including a structure wherein the low -_tempera
>
'
v75 -
2,188,954
4
ture evaporating element is within and shielded
by the higher, temperature element,- it is tobe
understood that these elements may be sepa
rated or disposed in separated compartments
without departing from the spirit and scope of my
invention.
,
reservoir for condensed refrigerant; thermostatic
means responsive-to the temperature of the re~
frigerant in the reservoir for controlling the stor-_
age of condensed refrigerant therein, said ther
mostatic means being movable to a ?rst posi
tion wherein condensed refrigerant collects in
'7
the reservoir and substantially no condensed re- 1
While I have shown my invention in but two frigerant is delivered to the second evaporating
forms, it will be obvious to those skilled in the element, said thermostatic means being movable
art that it is not so limited, but is susceptible to a second position‘ wherein condensed refrig
10 of various other changes and modi?cations with > erant is passed through the reservoir to the sec-_
out departing from the spirit thereof, and I de
ond element for vaporization therein, and means
‘sire, therefore, that only such limitations shall I responsive to the temperature of the second eled
be plaeedthereupon as are imposed by the prior ment for controlling the operation of the re
art or as are speci?cally set forth in the ap
frigerant condensing means.
15 pended claims.
5. In a refrigerating system, the combination
What I claim is:
of refrigerant condensing means, first and second
1. In refrigerating apparatus, the combination \ refrigerant evaporating elements, means for con
of ?rst and second evaporating elements, means .veying condensed refrigerant serially through
for condensing refrigerant vaporized in said ele
said ?rst-and second elements, a reservoir for
20 ments, means for conveying liquid refrigerant,
from the condensing means to said elements in
such.v manner that liquid refrigerant normally
?ows into the ?rst‘ element in preference to the
second element, and means responsive to a rela
tively low temperature of the refrigerant dis
charged from the ?rst evaporating element for
'
20
and second elements, and a thermostatic vdevice
responsive to the temperature of the refrig
erant entering the reservoir for .controlling the
storage of refrigerant therein, said device beingv 25
movable to a ?rst position in response to a rela
tively high temperature for effecting storage of
condensed refrigerant in the reservoir with sub
stantially nocondensed refrigerant being deliv
ered to the second evaporating element and mov 30
able to a second positionin response to a rela
tively lowatemperature for. passing condensed re
frigerant through the reservoir to said second ele
, of refrigerant condensing means, an ‘evaporator
structure having ?rst and second evaporating ele
ments, means for conveying the condensed re
ment for vaporization therein. ‘
.
_
6. In. a refrigerating system, thebcombination 35
of refrigerant condensing means, an evaporator
structure including side wall members and shelves
disposed therebetween, said sidewalls and shelves
, de?ning a pair of evaporating elements, a reser
atively large amount of condensed-refrigerant
is‘stored in the reservoir and substantially no
condensed. refrigerant is delivered to the second
evaporating element and movable, to a second
position, wherein a relatively small vamount of
refrigerant is stored, in the reservoir andv con
densed refrigerant is delivered to both of said ‘
,
15
condensed refrigerant disposed between said ?rst
admitting liquid refrigerant to said second ele
ment and being responsive to a relatively high
temperature for passing only refrigerant vapor
30' ized in the ?rst element to said second element.
2. In a refrigerating system, the combination
frigerant to said evaporator structure, a reser
voir for condensed refrigerant, and a thermostat
ically operated device arranged within the res
ervoir for varying the supply of refrigerant there
in and movable, to a ?rst position, wherein a rel
10
voir for condensed refrigerant, means for con
veying condensed refrigerantserially through the
shelves, the reservoir and the sidewalls in the
order named, a thermostatically operated device
arranged within the reservoir for controlling the
storage ofv refrigerant therein, said device being 45
disposed in heat exchanging relation with the re
frigerant entering‘ the reservoir fromthe shelves
and movable to a ?rstposition in-response to a
3. In a refrigerating systempthe combination ' ‘relatively high temperature of the'refrigerant for
evaporating elements.
'
‘
of refrigerant-condensing means, an evaporator
structure having ?rst and second evaporating ele
ments, means for conveying the condensed refrig
effecting storage of refrigerant in the reservoir
with substantially no condensed refrigerant being
delivered to the sidewalls, and being movable to
erant to said evaporator structure, a reservoir
a second position in response to a relatively low
- carried by said evaporator structure for storing
condensed refrigerant therein, a device disposed
within the, reservoir for controlling the storage
of’ refrigerant therein, thermostatically-operated
means responsive to the temperature of the re
frigerant in the reservoir for actuating said de
temperature
so
of the refrigerant for passing , con-‘ ‘Y
densed refrigerant to the sidewalls for vaporiza 55
tion therein.
'7. In a refrigerating system, the combination '
of refrigerant condensing means, an evaporator
structure having ?rst and second evaporating ele
vice to a ?rst position, wherein condensed refrig- I ments and a reservoir for the storage of condensed 60
erant is, stored in the reservoir and substantially
no condensed refrigerant is delivered to said sec
' 0nd evaporating element, and movable to a second
' I position,- wherein condensed refrigerant is dis
to
refrigerant, means for conveying condensed re-_
frigerantlfrom the condensing means through
said ?rst evaporating element, the reservoir, and
the second evaporating elementin the order
charged from the reservoir and is delivered to
both of said evaporating elements, and means
responsive to the temperature of the- second
evaporating element for-controlling the opera
tion of the refrigerant condensing means.
4.,In a refrigerating system, the combination
of refrigerant condensing‘mesns, ?rst and sec
ond refrigerant evaporating elements, means for
named, a thermostatically-operated device ar
ranged within the reservoir for controlling the
storage of condensed refrigerant therein and dis
posed in heat exchanging relation with the re
, conveying condensed refrigerant from the con
densed refrigerant in the reservoir with substan
densing means to said evaporating elements so
that it ?ows to the ?rst evaporating element in
preference to the second evaporating element, a
frigerant entering the reservoir from the first
evaporating element, said device being movable to 70
a ?rst-position in response to a relatively high
temperature for effecting the storage of con
tially no condensed refrigerant being delivered -
to the second evaporating element and movable to
a second position in response to a relatively/low"
.
5
2,188,964
temperature for passing condensed refrigerant
through the reservoir to said second evaporating
element for vaporization therein.
8. In refrigerating apparatus, the combination
of refrigerant condensing means, ?rst and second
refrigerant evaporating elements, a reservoir for
condensed refrigerant, means for conveying con
densed refrigerant in series through said ?rst ele
ment, the reservoir and said second element in
10 the order named, means for conveying vaporized
refrigerant from the second evaporating element
to the condensing means, a thermostatically oper
11. The method of cycling a refrigerating ma
chine having relatively high and low tempera
ture evaporating elements which comprises lique
fying refrigerant for the'evaporating elements in‘
response to a predetermined high temperature of
the high temperature element, effecting refrigera
tion of the low temperature element each time the .
high temperature element ‘calls for refrigeration,
substantially reducing refrigeration of the low
temperature element and effecting refrigeration 10
of the _> high temperature element when the low
temperature element issatis?ed in response to a
ated device responsive to the temperature of the ' predetermined low temperature of the low tem
refrigerant within the “reservoir for controlling perature element, and stopping liquefaction of
15 the storage of refrigerant therein, said device
refrigerant when the high temperature element is
being responsive to a predetermined relatively . satis?ed in response to a predetermined low tem 15
high temperature for effecting storage of con \ perature of the high temperature element.
densed refrigerantrln'the reservoir with substan
12. The method of cycling a refrigerating ma
tially no condensed refrigerant being delivered to chine having relatively high and low tempera
20 the second evaporating-element and being re
sponsive to a predetermined relatively low tem
perature for effecting passage of condensed re
frigerant through the reservoir to the second evap
ture evaporating elements which compriseslique 2,0
' fying refrigerant for the evaporating elements-in
response to a predetermined high temperature of
the high temperature element, effecting refrigera- ‘
crating element forvvaporization therein.
tion of the low temperature element each time
25 "9. In refrigerating apparatus, the combination the high ‘temperature element calls for refrigera
of a cabinet structure having a compartment tion, 'substantially‘reducing refrigeration of the 25
therein, a plurality of wall members de?ning a
refrigerant evaporating element and disposed in
heat exchanging relation with the air in said com
30 partment, a shelf disposed within said. wall mem
bers and de?ning a second evaporating element
disposed within said wall members for con
gealing ?uids, means de?ning a chamber for
low temperature element-and effecting refrigera
tion of the high‘ temperature element when the
low temperature element is satis?ed in response to
a predetermined low temperature of the lowytem 30
perature element, and stopping liquefaction of
refrigerant, when the high temperature element is
satis?ed in response to a predetermined low tem
storing condensed refrigerant, ‘means for with
perature of thehigh temperature element, which
35 drawing vaporized refrigerant from said wall latter low temperature is of a highenvalue than
members, means for condensing the withdrawn the low temperature in response to which re-' 35
refrigerant and for translating it in series through frigeration of. o the low temperature element is
said shelf, the chamber and said‘ wall mem
bers in the order named, thermostatically oper
13'. The method of-cycling a refrigerating ma
40 ated means disposed within said chamber in heat Ehine having ?rst and second evaporating ele
exchanging relation with the refrigerant con
ments which comprises. periodically circulating 40
tained therein for controlling the storage of liquid refrigerant to the elements, delivering a
refrigerant in the chamber, said thermostatically portion. of the circulated refrigerant to one of
stopped.
operated means being responsive to a_.predeter
45
mined relative1y~high temperature for effecting
storage of liquid refrigerant so. that substantially
no liquid refrigerant is delivered to the wall mem- '
bers and being responsive to a relatively low tem
perature for passing liquid refri‘gerantthrough
the chamber to‘ said wall members for evapora
tion therein, and means responsive to ‘the tem
> perature of the wall members for controlling the
operation of the condensing means. ,
,
10. In refrigerating apparatus, the combina
tion of a refrigerant circulating system in which
variable quantities of’ refrigerant are to be cir
, culated, a structure connected in said system and
de?ning a reservoir for storing variable quantities
of liquid refrigerant, means for admitting re
‘
.
_
.
-
1‘
said elementsfor vaporizationand withholding
a second portion of the refrigerant from circula
tion each time the machine is started, and sub
45
sequently releasingsaid withheld'refrigerant to
the second evaporating element for vaporization
therein when the temperature of the ?rst evapo
rating element has been depressed to a predeter
mined value.
_
50
14. The method of cycling‘ a refrigerating ma
chine having relatively high and low tempera
ture evaporating elements which comprises lique
fying, refrigerant for the evaporating elements in
response to a~ predetermined high temperature of 55
the high temperature element, delivering a por
tion of the lique?ed refrigerant for vaporization
in the low temperature element and withhold
frigerant to the reservoir, an outlet conduit ex ’ing from circulation.' a ‘second portion of the 60
tending upwardly in the reservoir and open at its . lique?ed refrigerant each ‘time the machine is
cycled, subsequently releasing said portion of‘ '
top for de?ning the maximum depth of refrig
erant to be stored, an inverted cup telescopically withheld refrigerant to'the high temperature ele
ment when the temperature of the low tempera
' arranged with respect" to the conduit, a thermo
static member responsive to the temperature of ture element has been depressed to a‘ predeter 65
the refrigerant in the reservoir for‘ supporting ' mined low value and terminating the liquefaction
said cup and having upper and lower positions, and delivery of refrigerant to both of said e1e-'
said member, in its upper position, maintaining ments'in response to a predetermined low tem
of the high temperature element, which
the cup elevated with ‘respect to the‘ conduit ' - perature
low temperature is of a higher .value than
whereby the maximum quantity of refrigerant, as’ latter
said temperature at which the withheld reirig_ 70
determined by the open top conduit, is stored in erant
is released.
_
"
~‘ _
the reservoir and,in its lower position, maintain
1_5. In refrigerating apparatus, the combina
ing 'the cup telescoped oh the conduit so that the _ tion of a c'abinetstructure, an evaporator dis
lower edge‘ of the cup de?nes a. lower level of posed within the cabinet structure and embody
~76 refrigerant in the reservoir.
ing wall members and a shelf enclosed therebygz?/
10
6 -_ -
areas“
said wall members and‘ shelf de?ning separate
refrigerant. evaporating elements, a refrigerant
condensing unit, means for periodically operat
ing the condensing unit, and means for auto
matically e?ecting, during each operation of the
condensing unit, vaporization of refrigerant in
said shelf at relatively vlow temperature and,
thereafter, in the wall members at a relatively
higher temperature. ,
10
16. In ‘refrigerating apparatus,‘ the combina
tion of a cabinet having a cooling compartment
therein, an evaporator structure disposed with
in said compartment and including a pair of
spaced wall members and a shelf disposed there
15 between, said wall members de?ning a relatively '
high temperature evaporating element for cooling
ization of refrigerant in the low temperature ele
ment ?rst and, thereafter, vaporization of re->v
frigerant in the high temperature element.
18. In a refrigerating system the combination
of ?rst and second evaporating elements, means
for supplying liquid refrigerant preferentially
to the ?rst element and secondarily to the sec
ond element, and means responsive to a rela
tively low temperature of the refrigerant dls- -
charged from the ?rst evaporating element for
admitting liquid refrigerant to said second evap
orating element and responsive to a relatively
high temperature for‘ passing refrigerant vapor
ized in the ?rst element to said second element.
19. In a refrigerating system, the combination 15'
of ?rst and second evaporating elements, means
for condensing refrigerant vaporized in said ele
the air in said compartment and said shelf de
?ning a relatively low temperature evaporating . ment, means for supplying the condensed refrig
erant to the evaporating elements so that it
element for congealing ?uids, a refrigerant con
?ows into the ?rst evaporating element until a 2,0
densing
unit,
means
for
periodically
effectingop
20
predetermined amount is ‘contained therein and
eration of the condensing unit, and means auto
matically actuated each time the condensing unit thence into the second evaporating element,
is operated, for effecting vaporization of refrig
erant ?rst in the shelf and, subsequently, in \the
25 wall members.
17. In refrigerating apparatus, the combina
tion of a cabinet structure, an evaporator dis
posed within the cabinet structure, said evapora
tor structure embodying wall'members de?ning
30 a relatively high temperature evaporating ele
ment and a shelf enclosed by the wall members
and de?ning a relatively low‘temperature evap
orating element, a ’mechanism for condensing
refrigerant evaporated in the high and low tem
35 perature evaporating elements, means responsive
to the temperature of the high temperature evap
means for storing a predetermined quantity of
condensed refrigerant in a portion of the system
other than the second element, and a thermo
25
static device exposed to the refrigerant dis
charged from the ?rst element for controlling
the storage of refrigerant in said storing means,
said device‘ being responsive to a relatively high
temperature of the refrigerant for effecting stor
age of refrigerant whereby condensed refrigerant
is delivered to the ?rst evaporator elementfor
vaporization and being responsive to a relatively
low temperature of the refrigerant for rendering
the storing means ineffective to store said quan
35'
tity of refrigerant whereby condensed refrigerant
orating element ‘for effecting periodic operation - is delivered to the second’ evaporating element
of the refrigerant condensing mechanism, and I for vaporization.
means for automatically effecting, during each
-- operation of the condensing mechanism, vapor- >
LESLIE
M. BUCHANAN.
40
CERTIFICATE OF CORRECTION.
Patent No“ 2,I55,95b,._
.
October 25, 1958;
'
LESLIE B. M. BUCHANANO
It is hereby certified that error appears in the printed specification
of the above numbered patent requiring correction as follows: Page 5, second
column, line 11, after the'syllable "wardly" and before the comma insert
the word. and; and that the said Letters Patent should be read with this
correction therein that the same may conform to the record of the case. in I
the Patent Office.
Signed and sealed this 6th day of December, Aa D, 1958.
Henry Van Arsdale
(Seal)
_
>
Acting Comniissioher of Patents._
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 051 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа