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Патент USA US2133964

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0d. 25, 1938.
|__ B, M, BUCHANAN
2,133,964
REFRIGERATING APPARATUS
Filed April 1, 1937
14
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mvENToR
Lzsuz B.M.BucHANAN.
BY
ATToR
2,133,964
Patented Oct. 25, 1938
UNITED STATES PATENT OFFICE
2,133,964
BEFRIGERATING APPARATUS
Leslie B. M. Buchanan, Springfield, Mass., as
signor to Westinghouse Electric & Manufac
turing Company, East Pittsburgh, Pa., a. corpo
ration of Pennsylvania
Application April 1, 1937, Serial No. 134,230
12 Claims. (Cl. 62-116)
My invention relates to refrigerating-a-ppßratus inet structure I4, and for freezing or congealing
and has for an objeci-I to provide improved ap
paratus of this kind.
A further object of the invention is to provide
improved refrigerating apparatus employing ex
pansion devices having elongated passages, com
monly referred to as “capillary tubes”.
A further object of the invention is to selec
liquids which may be contained in trays at I5.
The evaporator III may be formed with refrig
erated shelf portions I6 for supporting the trays
I5. A manifold I1 for refrigerant is disposed
adjacent the top of the evaporator I0, as shown.
The evaporator II, which preferably is pro
vided with fins I9, functions to cool the air in a
tively vary the amount of refrigerant passed by
relatively high temperature refrigerated chamber
10 an expansion device of the capillary tube type
in accordance with the requirements of the evap
orating means.
'
A still further object of the invention is to
provide an improved two temperature refrlgerat~
ing system having evaporators operating at dif
ferent temperatures and supplied with refriger»
ant by expansion devices of the capillary tube
type.
Another object of the invention is to prevent
20 passage of gas through the capillary tubes from
the condenser to the evaporators of a multi
evaporator refrigerating system during inactive
periods of the refrigerant circulating means.
These and other objects are effected by my
2GI invention as will be apparent from the following
description and claims taken in connection with
the accompanying drawing forming a part of this
application, in which:
Fig. 1 is a diagrammatic view of a refrigerat
30 ing system constructed and arranged ln accord
ance with my invention ;
Fig. 2 shows a second embodiment of the re
frigerant connections between the _evaporators
of systems constructed in accordance with the
35 invention; and,
_
Fig. 3 shows a, modified form of the thermo
static control apparatus of Fig. 1.
While my invention is applicable to various
forms of refrigerating systems having one or
more evaporators-supplied with condensed re
frigerant by expansion devices of the capillary
tube type, I have chosen to disclose it applied to
two temperature systems of the type shown and
claimed in my copending application, Serial No.
l 15,003, filed April 6, 1935 and assigned to the as
signee of the present application.
Referring now to Fig. l of the drawing, I have
shown low and high temperature evaporators Ill
and II, respectively, connected in the manner
disclosed in the aforementioned application and
described in detail hereinafter, which evapo
rators are supplied with refrigerant by a con
densing unit. generally indicated Vat I2. The
evaporator I0 is employed for cooling the air in
a low. temperature chamber I3, formed in a cab
I8 in which food products are stored. The evap
orator II is so proportioned that it is operated
at a relatively high temperature, whereby ex»
cessive dehydration of the air in the food storage
chamber I8 is prevented. The evaporator III is
operated at a, temperature below freezing for
facilitating the congelation of the fluid in the
trays I5 and for preserving frozen food products
stored in the chamber I3. Inlet and outlet mani
folds 2I and 22 are formed in the evaporator II,
the former being connected by a conduit 23 to
the manifold I ‘I of the low temperature evapo
rator I0.
The condensing unit I2 includes, preferably, a
compressor 24, driven by an electric motor 25,
and a condenser 2B. Refrigerant vapor-ized in
the evaporators I0 and II is Withdrawn by the
compressor through a suction conduit 2l and is
compressed to a relatively high pressure. ‘I'he
high pressure vapor is delivered through a con
duit 28 to the condenser 26 in which the vapor
is cooled and condensed. The condenser may be
cooled in any well known manner such as, for
example, by a fan 29.
Condensed refrigerant is conveyed from the
condenser 26 to the manifold I'I in a manner to
be described hereinafter. The condensed refrig
erant entering the manifold Il passes prefer
entially to the evaporator I0 and will enter the
connecting conduit 23 and evaporator II only
after the evaporator III Is full. The charge of
refrigerant in the system is such that the evapo
rators I0 and II are ñlled when all of the charge
is circulated and, therefore, vaporization is ei’
fected, primarily, in the higher temperature
evaporator II. As the evaporator IU is normally
maintained at a lower temperature, substantially
no vaporization is effected therein and, as it is
filled with liquid refrigerant, vapor generated in
the higher temperature evaporator Il is pre
vented from entering the low temperature evapo
rator I0 and condensing therein.
Vaporization of refrigerant in the low tempera
ture evaporator IIJ is effected by reducing the
amount of refrigerant in the low side of the sys
tem so that condensed refrigerant is present in 55
2
2,138,964
only the low temperature evaporator I0. This
operation is effected by wlthholdng from circula
tion a quantity of condensed refrigerant equiva
lent to the quantity present in the high tempera
ture evaporator when itis active plus the quantity
required to i'lll the vapor space in the low tem
perature evaporator when it is active. The with
held refrigerant is stored in the high side of the
system in a suitable reservoir or in the condenser.
10 At this time, vaporation is effected at low pres
sure in the evaporator I3 and substantially no
cooling is effected by the evaporator || as it con
tains only gaseous refrigerant discharged by the
evaporator ||l.
'I‘he connections between the evaporators in
Fig- l for conveying refrigerant is shown by way
of example and it will be understood that they
may be connected in other suitable manners.
For example, the low and high temperature evap
20 orators may be connected in series, as shown in
Fig. 2. The low temperature evaporator is shown
in this figure at Illa and receives refrigerant
from the capillary tube 35, the latter being con
nected to the bottom of the evaporator Iûa, as
25 shown at 35a, so that refrigerant passes through
the evaporators l|la and || in series. The other
portions of the system may be similar to those
shown in Fig. 1 and elements shown in both
ñgures which are common thereto are indicated
30 by similar numerals.
The apparatus described in the foregoing is
disclosed and claimed in my aforementioned oo
pending application. It will be apparent to those
skilled in the art that the system operates on the
35 well known compressor-condenser-expander cycle
so that further detailed description of the op~
eration is not necessary.
In accordance with my invention, improved
means including expansion devices of the capil
40 lary tube type are employed for conveying the
condensed refrigerant to the evaporators |0 and
Il. A reservoir 3| is provided for storing con
densed refrigerant during periods when the low
temperature evaporator ||l is active and receives
45 refrigerant from the condenser 26 through a
conduit 32. A capillary tube 33 having serially
connected portions 34 and 35 provides communi
cation between the reservoir 3| and the manifold
| 1. Preferably the capillary tube 33 connects
50 with an open topped conduit 36 that communi
cates with an upper portion of the reservoir 3|
and determines the amount of refrigerant that is
stored therein.
`
A second tube 31 provides communication be
55 tween the bottom of the reservoir 3l and the por
tion of the capillary tube 33 intermediate its por
tions 34 and 35. Flow of refrigerant from the
reservoir 3| through the tube 31 is controlled,
preferably, by a valve 38 actuated in any suitable
60 manner as by a solenoid 39.
The valve 3B is nor
mally biased by a spring 4| to its open position,
as shown, and it is closed upon energization of
the solenoid 33.
The tube portions 34 and 35 define a high re
66 sistance expansion device for the liquid refrig
erant .passed to the evaporator |0 during its
active periods. At this time, the pressure dif
ference prevailing between the high and low
sides of the system is high so that a tube having
70 high resistance is necessary for conveying sub
stantially the same amount of refrigerant to the
evaporator asis condensed. When vaporization
is effected at relatively high pressure in the evap
orator ||, the pressure dliïerential between the
75 high and low sides of the system is relatively low
and, therefore, the resistance of the expansion
tube must be relatively low, otherwise refrigerant
will be condensed faster than it is delivered by
the expansion device with consequent backing up
of liquid in the reservoir, and, therefore, starving
the high temperature evaporator. Accordingly,
the tube 31 is formed to offer less resistance to
the passage of refrigerant than the tube portion
34 so that the total resistance of the tube 31
and tube portion 35 is less than the total resist 10
ance of the tube portions 34 and 35.
During periods when the solenoid 39 is de
energized, and the valve 38 is open, condensed re
frigerant entering the reservoir 3| passes through
the tube 31 and the portion 35 oi’ the capillary 15
tube 33 to the evaporators I0 and Il. Accord
ingly, both evaporators Ill and || contain liquid
refrigerant and vaporization at relatively high
pressure and temperature is effected in the evap
orator Il during operation of the compressor 24 20
as described heretofore. At this time, some gas
may escape from the resorvoir 3| through the
portion 34 of the tube 33 but this will be negligible
as the pressure prevailing between the ends of
the tube portion 34 will be substantially equalized 25
by the tube 31 and the portion 34, furthermore.
offers very high restriction to the flow of gas.
Energization of the solenoid 39 closes the valve
38 whereby condensed refrigerant collects in the
reservoir 3| to a depth determined by the eleva 30
tion of the tube 36 and this quantity of refrig
erant is withheld from circulation. Accordingly,
the amount of refrigerant in the low yside is suin
cient to fill only the evaporator |0 and vaporiza
tion therein is effected at low pressure during op 35
eration of the compressor 24.
The thermostatic control apparatus will „now
be described. The source of electric power for
the motor 25 and the solenoid 39 is represented
by line conductors L1 and Lz, one terminal of the 40
motor 25 and the solenoid 39 being connected to
the conductor Li, as shown. Low and high tem
perature thermostats 42 and 43 may be suitably
disposed within the chambers I3 and I3, respec
tively, for controlling the operation of the motor 45
25 and the solenoid 39. The thermostat 42 in
cludes switches 44 and 45 that are closed When
a predetermined high temperature prevails in the
chamber |3 and are opened in response to a. pre
determined low temperature therein. The ther 50
mostat 43 includes a switch 45 that is opened
and closed in response to predetermined low and
>high temperatures Within the chamber, IB, re
spectively.
The opposite terminal of the motor 25 is con 55
nected by a conductor 41, having the switch 46
connected therein to the line conductor L2. A
branch conductor 48, controlled by the switch 45
connects the conductor 41 to the line conductor
L2, so that the switches 45 and 46 control ener
gization of the motor 25 in parallel. The oppo
60
site terminal of the solenoid is connected by
a conductor 49 having the switch 44 connected
therein, to the line conductor La.
Operation
65
As shown in Fig. l, the thermostat switches
44, 45, and 46 are open as the temperatures
prevailing in the chambers I3 and i8 are below
values at which the thermostats 42 and 43 effect 70
closing thereof. 'I'he valve 38 is therefore open,
the solenoid 39 being deenergized and the com
pressor 24 and its motor 25 are idle.
As no
refrigerant is stored in the reservoir 3|, both
evaporators I0 and || contain liquid refrigerant. 75
@183,964
Assume now that the « temperature in the
chamber i8 rises sumciently to close the switch
45 for energizing the motor 25. Operation of the
compressor 2l is initiated and vaporization of
refrigerant within the evaporator Il is effected.
Substantially no vaporization is effected at this
time in the evaporator Ilias its temperature is
lower than the temperature of vaporization cor
responding to the pressure of the refrigerant in
both evaporators IB and Il. Refrigerant con
densed in the condenser 25 flows through the
conduit 32, the reservoir 3|, the conduit 31 and
the tube portion 35 to the manifold I1, conduit
23 and the evaporator Il as fast as it is con
15 densed. The conduit 31 and the tube portion 35
define a relatively low resistance expansion ele
ment for the refrigerant, the prevailing pressure
differential between the high and low sides at
this time being relatively low. Operation of the
compressor 2l continues until the temperature
of the air in the chamber I8 is depressed to the
value at which the thermostat switch 65 opens.
As the temperature within the chamber i3 rises
to the value at which the thermostat l2 is
adjusted to close the switches 44 and I5, the
motor 25 and the solenoid 39 are energized, the
latter effecting closure of the valve 38. Opera
tion of the compressor first effects vaporization
of refrigerant in the evaporator Il until it is
exhausted, the vapor being condensed and col
lected in the reservoir 3| to a depth determined
by the conduit 3B. This produces some cooling
of the air in the chamber I8 but the amount of
refrigerant in the evaporator | I is soon exhausted
and vaporization is initiated in the evaporator IIJ.
The compressor 2| operates to depress the pres
sure and temperature of the refrigerant within
3
may be given preference if desired by connecting
the various elements as showrf'in Fig. 3.
In this embodiment, the low and high tem
perature thermostats are shown at 52 and 53,
respectively. The low temperature thermostat 52
closes and opens a switch 5I in response to pre
determined high and low temperatures and the
thermostat 53 actuates a pair of switches 55 and
56, one of the latter being closed as the other is
open. The switches 55 and 54 contol energize. 10
tion of the compressor motor 25 and close when
their respective thermostats respond to prede
termined high temperatures in their associated
chambers. The switch 55 permits energizatlon
of the solenoid 39 when the temperature reflected 15
by the high temperature thermostat 53 ,is below
the value at which it effects closure of the switch
55 and operation of the motor 25. At this time,
energization of the solenoid 33 and motor 25 is
effected by closure of the switch 54 in response to 20
a predetermined high temperature obtaining
within the low temperature chamber.
From the foregoing, it will be apparent that
the connections shown in Fig. 3 give preference
to the higher temperature thermostat 53 when
both thermostats demand operation of the com
pressor 24. At this time, the switches 54 and 55
are closed whereby the motor 25 is energized but
the solenoid 39 is deenergìzed as the switch 56
is open. Accordingly, the valve 38 is open and 30
both evaporators IIJ and || contain refrigerant.
As described heretofore, vaporization is effected
in the higher temperature evaporator || in this
position of the apparatus.
I have referred throughout this specification 35
to expansion devices of the capillary tube type.
In defining a capillary tube, I desire it to be un
derstood that it includes all forms of expansion
devices having a passage that is relatively long
with respect to its diameter or its flow area.
40
the suction conduit 21. The pressure differen
I have disclosed a form of refrigerating sys
tial between the high and low sides at this time
is high and the high resistance expansion tube tem to which my invention may be applied, but
33, including its portions 3| and 35, is effective it will be understood that it is not so limited and
to convey and expand the refrigerant. As the may be applied to other systems of either the
temperature Within the chamber I3 is depressed single or the multiple temperature type wherein 45
to the value at which the thermostat 42 opens capillary tubes are employed and where it is de
its switches M and I5, the motor 25 and solenoid sired that refrigerant is delivered from the high
39 are deenergized. Operation of the compressor to the low sides at different selected rates.
While I have shown my invention in several
24 is, therefore, terminated and the valve 38 is
forms, it will be obvious to those skilled in the 50
opened by the tension spring 4|.
The purpose of opening the valve 38 at this art that it is not so limited, but is susceptible
time is to pass the stored liquid in the reservoir of various other changes and modifications with
3| to the low side of the system, otherwise it out departing from the spirit thereof, and I de
would vaporize in the reservoir 3| and pass to theì sire, therefore, that only such limitations shall
low side as gas, resulting as a loss, extending be placed thereupon as are imposed by the prior
the time for pressure equalization between the art or as are speciñcally set forth in the appended
high and low sides and causing sweating of the . claims.
What I claim is:
reservoir structure. As the valve 38 opens, the
1. In refrigerating apparatus, the combination
stored liquid passes through the low resistance
conduits 31 and tube portion 35, the manifold of an evaporator structure, means for withdraw 60
I1, conduit 23 to the evaporator Il. Some of ing refrigerant vaporized in the evaporator
this liquid is vaporized in the evaporator Il, structure, means for condensing the withdrawn
refrigerant, means for conveying the condensed
which vaporization ceases as the pressure ín
creases to a value determined by the temperature refrigerant to the evaporator structure, said
of the evaporator ||. During this increase in conveying means including first and second cap 65
pressure in the low side, it will be apparent that illary expansion means having different resist
substantially no heating of the low temperature ances to refrigerant flow and means for selecting
evaporator is eiîected as it is filled with liquid the expansion means that is effective to convey
the refrigerant to the evaporator structure and
which prevents gas from entering and condens
means for storing and withholding from the evap 70
ing therein.
In the event that both thermostats close their orator structure a predetermined quantity of con
respective switches at the same time, the low densed refrigerant when the capillary expansion
temperature thermostat 42 takes preference as means of greater resistance is rendered effective
the evaporator Il), the vaporized refrigerant pass
ing through the conduit 23 and evaporator Il to
40
50
55
65
70
the solenoid 39 is energized and storage of liquid
75 on the high side is effected. The thermostat I3
and releasing said predetermined quantity of said
condensed refrigerant to the evaporator structure
4
2,133,964
when the capillary expansion means of lesser re
sistance is rendered effective.
the evaporators during periods when refrigerant
2. 1n refrigerating apparatus, the combination
of an evaporator structure, means for withdraw
ing vaporous refrigerant from the evaporator
structure, means for condensing the withdrawn
refrigerant, and means for conveying the con
densed refrigerant to the evaporator structure,
said conveying means defining a pair of elon
10 gated passages having different resistances to the
flow of refrigerant, and means for selectively
rendering one or the other of the passages effec
tive to convey the refrigerant and means for
withholding from the evaporator structure a pre
16 determined quantity of condensed refrigerant
when the elongated passage oi' greater resistance
is rendered effective and releasing said predeter
mined quantity of condensed refrigerant to the
evaporator structure when the elongated passage
20 of lesser resistance is rendered effective.
3. In refrigerating apparatus, the combination
with relatively low and high temperature evapo
rators and means for condensing refrigerant va
porized in the evaporators, of means for convey
ing the condensed refrigerant to the evaporators
in such manner that it ñows into the low tem
perature evaporator by preference and thence
into the higher temperature evaporator; said
conveying means including a pair of elongated
80 conduits having different reslstances to the flow
of refrigerant and means for selecting the con
duit that is effective for conveying the refrigerant.
4. In refrigerating apparatus, the combination
with relatively low and high temperature evapo
porlzed in the evaporators. of means for convey
is delivered for vaporization in the higher tem
perature evaporator, a first expansion device for
50 conveying the condensed refrigerant to the evap
orators during periods when refrigerant is stored
in the refrigerant storage means and a second
expansion device for conveying refrigerant to the
evaporators during periods when storage of re
55 frigerant is not effected in the refrigerant stor
age means and means for selecting the expan
sion device that is effective for conveying the re
frigerant to the evaporators.
5. In refrigerating apparatus. the combination
60 with relatively high and low temperature evapo
rators, and means for condensing refrigerant va
porized in the evaporators. of means for convey~
ing the condensed refrigerant to the evaporators
in such manner that the refrigerant flows by
preference into the low temperature evaporator
until it is ñlled and thence into the higher tem
perature evaporator. said refrigerant conveying
means including a container in which a prede
termined quantity of condensed refrigerant may
be stored and withheld from circulation at which
time the low temperature evaporator only con
tains condensed refrigerant, means for control
ling the storage of refrigerant in the container,
conduit means having relatively high resistance
75 for conveying refrigerant from the container to
6. In refrigerating apparatus, the combination
of relatively high and low temperature evapo
rators so connected that condensed refrigerant
admitted thereto flows by preference into the 10
low temperature evaporator and thence into the
higher temperature evaporator, means for con
densing refrigerant vaporized in the evaporators.
a container for receiving condensed refrigerant
from the condensing means, a relatively high 1B
resistance expansion conduit communicating
with an upper portion of the container for con
veying refrigerant therefrom to the evaporators,
a relatively low resistance expansion conduit
communicating with a lower portion of the con
tainer for conveying refrigerant therefrom to the
evaporator,` a valve biased to its open position
controlling the passage of refrigerant through
said low resistance conduit, and thermostats as
sociated with each evaporator and being respon
for effecting operation of the condensing means
and being responsive to predetermined low tem
peratures thereof for terminating operation of
the condensing means, said thermostat assocl~
ated with the low temperature evaporator being
eifective to close said biased valve during peri
ods when it effects operation of the condensing
7. The combination as claimed in claim 6 hav
ing the condensed refrigerant to the evaporators
in such manner that it flows into the low tem
veying refrigerant from the container to the
evaporators when storage of refrigerant in the
container is not effected.
means.
35 rators and means for condensing refrigerant va
perature evaporator by preference and thence
40 into the higher temperature evaporator; said
conveying means including means for storing and
withholding from circulation a predetermined
amount of condensed refrigerant at which time
condensed refrigerant is delivered for vaporiza
45 tion in the low temperature evaporator only,
means for releasing the withheld refrigerant in
the storing means whereby condensed refrigerant
is stored in the container, and a second conduit
means having relatively low resistance for con
ing means for rendering the thermostat associ
ated with the low temperature evaporator inef
fective to control the compressor and the valve
during periods when the thermostat associated
with the high temperature evaporator effects
operation of the condensing means.
8. In refrigeratlng apparatus, the combination
of an evaporator structure, means for condensing
refrigerant vaporized in said structur , a con
duit having relatively high resistance for con
ducting the condensed refrigerant from the con 45.
densing means to the evaporator structure, a
second conduit having relatively low resistance
for conveying condensed refrigerant and con~
nected to said ñrst conduit intermediate its ends
whereby a by-pass is defined in parallel with a 50
portion of the high resistance conduit, and means
for controlling the passage of refrigerant through
Said low resistance conduit and means for stor
ing and withholding from the evaporator struc
ture a predetermined quantity of condensed re- 55
frigerant during periods when the refrigerant is
conveyed by the high resistance conduit and re
leasing said predetermined quantity of said con
densed refrigerant to the evaporator structure
during periods when passage of refrigerant is ef 60
fected through the low resistance conduit.
9. The combination as claimed in claim 8
wherein said refrigerant controlling means is
thermostatically actuated.
10. In refrigeration apparatus, the combina
tion of relatively high and low temperature evapo
65
rators so connected that condensed refrigerant
admitted thereto flows by preference into the low
temperature evaporator and thence into the
higher temperature evaporator, means for con 70
densing the refrigerant vaporized in the evapo
rators, a conduit having relatively high resistance
for conducting the condensed refrigerant from
the condensing means to the evaporators, a second 75
amasar
12. In refrigeration apparatus, the combination
conduit for conveying condensed refrigerant and
of relatively high and low temperature evapo
rators so connected that condensed refrigerant
admitted thereto flows by preference into the low
temperature evaporator and thence into the Cil
having an end thereof connected to an inter
mediate portion of said first conduit and deilning
a by-pass around a portion of the ñrst conduit,
and valve means controlling the passage of re
higher temperature evaporator, means for con
frigerant in said second conduit.
11. In refrigeration apparatus, the combina
tion of relatively high and low temperature evapo
rators so connected that condensed refrigerant
admitted thereto flows by preference into the low
temperature evaporator and thence into the
higher temperature evaporator, means for con
densing the refrigerant vaporized in the evapo
rators, a conduit having relatively high resistance
for conducting the condensed refrigerant from
densing the refrigerant vaporized in the evapo
rators, a conduit having relatively high resistance
for conducting the condensed refrigerant from
the condensing means to the evaporators, a
duit and iirst and second thermostats responsive
to the temperatures of the respective low and high
temperature evaporators for controlling the oper
ation of the refrigerant condensing means, said 20
thermostat associated with the low temperature
evaporator being effective to close said valve dur
ing periods when it effects operation of the re
frigerant condensing means, said valve being open
at all other times, and means for rendering said
thermostat associated with the low temperature
evaporator inactive to control the valve during
periods when the thermostat associated with the
the condensing means to the evaporators, a
second conduit for conveying condensed refrig
erant and having an end portion thereof con
nected to an intermediate portion of said first
conduit and defining a by-pass around a por
tion of the first conduit, a valve for controlling
the passage of refrigerant in said second con
second conduit for conveying condensed refrig
erant and having an end portion thereof con
nected to an intermediate portion of said first
conduit and deiining a by-pass around a por
tion of the i'lrst conduit, a valve for controlling
the passage of refrigerant in said second con
duit and ñrst and second thermostats responsive
to the temperatures of the respective low and high
temperature evaporators for controlling the oper
ation of the refrigerant condensing means, said
thermostat associated with the low temperature
being eñective to close said valve during periods
when it eilects operation of the refrigerant con
higher temperature evaporator eifects operation
of the refrigerant condensing means.
densing means and said valve being open at all
other times.
LESLIE B. M. BUCHANAN.
CERTIFICATE 0F CORRECTION.
October 25„ 1938.
Patent No. 2,135,961»
‘
`
LESLIE s.
r1.
BUCHANAN.
It is hereby certified that error appears in the printed specification
of the above numbered patent~ requiring c orrection as follows: .Page 5, second
column, line 67, claim l , strike out the word "and" and insert instead a
comma; page h., first column, line 1l, claim 2, and second column, line 52,
claim B, strike out "and" ; and that the said Lettera> Patent should be read
with this correction therein that the same may conform to the record of
the case in the Patent Office.
signed and sealed this 6th ,dayef December, A. D. 1958.
Henry Van Arsdale
(Seal)
Acting Commissioner of, Patents.
30
amasar
12. In refrigeration apparatus, the combination
conduit for conveying condensed refrigerant and
of relatively high and low temperature evapo
rators so connected that condensed refrigerant
admitted thereto flows by preference into the low
temperature evaporator and thence into the Cil
having an end thereof connected to an inter
mediate portion of said first conduit and deilning
a by-pass around a portion of the ñrst conduit,
and valve means controlling the passage of re
higher temperature evaporator, means for con
frigerant in said second conduit.
11. In refrigeration apparatus, the combina
tion of relatively high and low temperature evapo
rators so connected that condensed refrigerant
admitted thereto flows by preference into the low
temperature evaporator and thence into the
higher temperature evaporator, means for con
densing the refrigerant vaporized in the evapo
rators, a conduit having relatively high resistance
for conducting the condensed refrigerant from
densing the refrigerant vaporized in the evapo
rators, a conduit having relatively high resistance
for conducting the condensed refrigerant from
the condensing means to the evaporators, a
duit and iirst and second thermostats responsive
to the temperatures of the respective low and high
temperature evaporators for controlling the oper
ation of the refrigerant condensing means, said 20
thermostat associated with the low temperature
evaporator being effective to close said valve dur
ing periods when it effects operation of the re
frigerant condensing means, said valve being open
at all other times, and means for rendering said
thermostat associated with the low temperature
evaporator inactive to control the valve during
periods when the thermostat associated with the
the condensing means to the evaporators, a
second conduit for conveying condensed refrig
erant and having an end portion thereof con
nected to an intermediate portion of said first
conduit and defining a by-pass around a por
tion of the first conduit, a valve for controlling
the passage of refrigerant in said second con
second conduit for conveying condensed refrig
erant and having an end portion thereof con
nected to an intermediate portion of said first
conduit and deiining a by-pass around a por
tion of the i'lrst conduit, a valve for controlling
the passage of refrigerant in said second con
duit and ñrst and second thermostats responsive
to the temperatures of the respective low and high
temperature evaporators for controlling the oper
ation of the refrigerant condensing means, said
thermostat associated with the low temperature
being eñective to close said valve during periods
when it eilects operation of the refrigerant con
higher temperature evaporator eifects operation
of the refrigerant condensing means.
densing means and said valve being open at all
other times.
LESLIE B. M. BUCHANAN.
CERTIFICATE 0F CORRECTION.
October 25„ 1938.
Patent No. 2,135,961»
‘
`
LESLIE s.
r1.
BUCHANAN.
It is hereby certified that error appears in the printed specification
of the above numbered patent~ requiring c orrection as follows: .Page 5, second
column, line 67, claim l , strike out the word "and" and insert instead a
comma; page h., first column, line 1l, claim 2, and second column, line 52,
claim B, strike out "and" ; and that the said Lettera> Patent should be read
with this correction therein that the same may conform to the record of
the case in the Patent Office.
signed and sealed this 6th ,dayef December, A. D. 1958.
Henry Van Arsdale
(Seal)
Acting Commissioner of, Patents.
30
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