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Патент USA US2133962

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Oct. 25,‘ 1938.
M. G. SHOEMAKER
2,133,962
REFRIGERATYING APPARATUS
Filed Oct. 30, 1956
22'
. Fig.2,
WI TN ESSES:
INVENTOR
'MnLccLM G. S‘HOEMRKER
'
BY
ATTORNEY
Patented Oct. 25, 1938 .
, 2,133,962
UNITED STATES PATENT‘OFFAICE ~
nnrmonna'mvc APPARATUS
Malcolm G. Shoemaker, Spring?eld, Mass, as
. signor to Westinghouse Electric & Manufac
turing Company,-East Pittsburgh, 2a., a cor
poration of Pennsylvania
-
.
Application October 30, 1936, Serial No. 108,361
7 Claims. (CL 62-415)
My invention relates to refrigerating appa- 28. The valve plate 25 closes the ports '25 and
'ratus having a plurality of evaporator elements
and ‘has for an object to provide improved appa
ratus of this kind.
5
A further object of the invention is to provide
an improved multi-evaporator refrigerating sys
tem having a high side ?oat valve mechanism
commonto the evaporators with means for se
lecting the evaporator to receiverefrigerant from
10 the valve mechanism.
7
'
,
These and other objects are effected by my in-_
vention as will be apparent from the.‘ following
description and claims taken in connection with
the accompanying drawing, forming a part of this
15 application in which:
. .
Fig. 1 is a diagrammatic view of a refrigerating
system constructed in accordance with my in
21, successively, as the level of the refrigerant _ .
in the vcasing 25 falls..
The position of the ?oat 22 and valve plate 29 _
shown in the drawing, indicates that the solenoid .16
valve 24 is closed so that liquid cannot pass
through the port 21. Accordingly, the ?oat 52
controls'the ?ow of refrigerant passing through
the port 28 in response to the level of refrigerant ,
in the casing 25. when the solenoid valve 24 is 10
opened, refrigerant passesimmediately through
theport 21 and conduit 22 to the evaporator i5.
As the level of refrigerant in the casing ‘25 drops,
the valve plate 29 closes the port 25 and controls ‘
the ?ow of refrigerant through the port 2'! in re‘- 15
spouse to the level of refrigerant in’the casing 25.
The operation of the evaporator: 12 and l5 ‘
' is selectively controlled by the solenoid valve“.
vention; and
Fig. 2 is an enlarged sectional view of the ?oat when solenoid 25 is energized, the valve 24 is
' open and flow of condensed refrigerant to the 20.
20 valve employed in the system shown in Fig. l.
’ Referring now to the drawing, the numerals i0 evaporator I2 is e?ected under control of the
?oat 32. At this time, the valve plate ,28-closes
and II indicate relatively high and low tempera
the port 28 so that the conduit 22 and evaporator
- ture chambers which are. refrigerated by evapo
l2 receive no condensed refrigerant.
rators l2 and i3, respectively. Refrigerant va
Operation of the evaporator I2 ‘is effected by 25
2'5 porized in the evaporators i2 and I3 is withdrawn
therefrom by a compressor l4 through a conduit
l5 common vto both evaporators. The compres
sor I4 is driven, preferably, by a motor l5 and
operates to ‘compress the vapor withdrawn from
30.12116 evaporators l2 and I3 to a relatively high
'
pressure in a condenser H.
The condenser I1
is cooled in‘ any suitable manner, such as, for
7 example,‘ by a fan l8, ‘whereby the high pressure
vapor is condensed. A reservoir l9 maybe pro
35 vided for collecting refrigerant lique?ed in the‘
condenser H.
Y
Condensed refrigerant is conveyed through a
conduit 20 from the reservoir 19 to a ?oat valve
[ structure, shown generally at 2!, and connected
40 to the evaporators l2 and i3 by conduits 22 and
'23. A valve 24 actuated by a solenoid 25 is dis
posed in the conduit 22 for controlling the ?ow
of refrigerant therethrough. The construction
deenergizing the solenoid 25, whereby the valve 24‘
closes. Flow of refrigerant through the port'2'l
and conduit 22 to the evaporator .I2 is then termi
nated. Accordingly, the level of refrigerant in
the ?oat valve' structure 2| rises 'as the com- 30
pressor I4‘ is operated and refrigerant is supplied ‘
to the evaporator vl3 through the port .25. and
conduit 23 in response to the level of refrigerant
-in the casing 25.
- Automatic control of the operation of the evap- 35
orators l2 and i2 may be e?ected by thermostats
35 and 36 that respond'to temperatures within
the respective chambers HIV and II and which
control the energization of the motor l6 and
solenoid 25. The source of electric power for 40
the motor l6 and solenoid 25 is represented by 7
line conductors Li and In.
.
_
when closed, the thermostat 25 energizes the
and operation of solenoid operated valves is well motor l5 for operating the compressor I4 where
45 known in the art and will not be described, other by refrigerant is supplied to the evaporator I3, 45
than to say that the valve 24 is open when the the solenoid valve 24 beingclosed. ' The energiz
solenoid 25 is energized and is closed when the ing circuit‘includes the line conductorLi, motor
l6, a conductor 51, thermostat 25, and line con
solenoid 25 is deenergized.
The ?oat valve structure 2| includes a casing ductor’La when the thermostat 35 is closed,
50 26 that receives condensed refrigerant‘from the the motor l5 and solenoid 25 are'energized and 50
‘
conduit 20.
The conduits 22 and 23 terminate
in ports 21 and 28 communicating with them
terior of the casing 26. A valve plate 29, pivoted
at 3|, is actuated by a ?oat 32 that rises and falls
' withthe level of liquid refrigerant ‘in the casing
the compressor operates to circulate refrigerant
throughr the evaporator i2. I have shown the
solenoid-25 arranged in series with the motor i5
when the latter is energized by the thermostat
55, but it will be understood that it may be con- 55
2
2,188,902
nected otherwise for energization at this time.
The energizing circuit for the motor I6 .and
solenoid 25 includes the line conductor Laimotor
I6, a conductor 33 having the solenoid 25 con
nected therein, 'the thermostat 35, a conductor
33, and the line conductor La.
The electric connections disclosed give pref
erence to the thermostat 36 when both thermo
stats 35 and 36 are closed, as the-thermostat 36
10 forms a shunt across the circuit including the
the low temperature evaporator I3, the, higher I
temperature evaporator is substantially devoid‘,
of liquid refrigerant and when evaporation is
effected in the high temperature evaporator l2,
the low temperature evaporator is substantially
?lled with liquid refrigerant. It will be apparent
that there is a larger amount of liquid refrigerant
in the high side of the system when vaporization
is effected in the low temperature evaporator I3
than when vaporization is effected in the high 10
conductor 38, solenoid 25, thermostat 35 and temperature evaporator I2. The added amount
conductor 39. Accordingly, the solenoid 25 is of refrigerant in the high side during refrigera-_
deenergized under this condition and refrigerant tion of the low temperature evaporator I3 col
is, therefore, passed to the low temperature ' lects in the ?oat valve casing 26 and effects rais
evaporator I3 associated with the thermostat 36. ing of the ?oat 32 su?lciently to open the port 15
It will be understood that the thermostat 35 and
its associated higher temperature evaporator I2
may be given preference, if desired.
20
Operation
. As shown in Fig. 1, the temperatures of the‘
air in the chambers I 0 and It are below values
at which their respective thermostats close and,
therefore, the motor I6 and compressor I4 are
inactive. Assume a rise in temperature in the
chamber III to the value at which the thermostat
35 closes. The motor I6 and solenoid 25 are
energized by the aforementioned circuit so that '
28. The volume of the casing 26 and the re
frigerant charge may be so proportioned that
the level of refrigerant in the casing 26 is at
proper elevations for the different amounts of
refrigerant present in the high side of the system. 20
When both chambers I0 and II require cooling,
their respective thermostats 35 and 36 are closed.
The low temperature chamber II is given pref
erence as the thermostat 36 shunts the thermo- .
stats 35 and solenoid 25, as described heretofore. 2.5
Accordingly, the solenoid 25 is deenergized and
the valve 24 is closed, whereby condensed refrig
erant is supplied to the ' evaporator I3 only.
operation of the compressor I4 and opening of When the temperature of the air in chamber II
the valve 24 are effected.
is depressed to the desired value, the thermostat
Condensed refrigerant in the casing 26 of the 36 opens the shunt across the solenoid 25, which 30
valve structure 2I is passed through the port is energized and transfers the ?ow of refrigerant‘
21 and conduit 22 to the evaporator I2 under from the evaporator I3 to the evaporator I2, The
control of the ?oat 32. As the valve plate 23 compressor I4 continues to operate as the motor
35 covers the port 28, no condensed refrigerant. ' [I6 is energized by the closed thermostat 35.
35
is passed to the evaporator I3. Operation of the
compressor I4 continues‘ until the temperature
of the air in the chamber I0 is depressed to the
‘value at which the thermostat 35 opens whereby
,40 the compressor I4 is stopped and the solenoid 25
is deenergired. During periods when vaporiza
tion is effected in the evaporator I2, the evapo
rator I3 is ?lled, substantially, with refrigerant
but vaporization is not effected therein-as its
temperature is lower than the temperature of
vaporization in the higher temperaturev evapo
rator I2. Vapor from the evaporator I2 is pre
vented from condensing in the low temperature
evaporator I3 as the latter is substantially ?lled
50
,with liquid refrigerant.
Assume a .rise in temperature within the low
From the foregoing, it will be apparent that I
have provided an improved two temperature
refrigerating system having a novel ?oat valve
structure for controlling the ?ow of refrigerant
to the high and low temperature evaporators 40
with means for selecting the evaporator to re
ceive refrigerant.
'
It will be understood that other forms of re
frigerant condensing units niay be' employed
without departing from‘ the ‘spirit of the inven
tion. The various control instrumentalities are
shown byway of example and in their simplest
form for the sake of clearness andi it will be
understood that other forms or types. of control
devices may be employed. The speci?c construc 50
tion of the ?oat valve mechanism disclosed may .
be considered as the preferred form but it is
temperature chamber II to the value at which
the thermostat 36 closes the aforementioned cir - apparent that other forms may be adopted.
cuit for energizing the motor I6. Operationof
While I have shown my invention in but one
the compressor I4 is initiated and withdraws
' vaporous refrigerant which is present in the
evaporators l2 and I3. As the solenoid 25 is de
energized and the valve 24 closed, no condensed
refrigerant is- passed to the evaporator I2. Con
densed refrigerant delivered to ‘the casing 28
raises the ?oat 32 sufficiently to open the port 23
so that refrigerant is delivered to the evaporator
I 3 through theconduit 23 under control of the
?oat 32. As the evaporator I2 operates at a
higher temperature than the evaporator I3, va
porization of the refrigerant therein is effected
form, it will be obvious to those skilled in the
art that it is not so limited, but is susceptible of
various changes and modi?cations without de
parting from the spirit thereof, and I desire,
therefore, that only such limitations shall be
placed thereupon as are imposed by the prior art 60
or as are speci?cally set forth in the appended
claims.--
-
'What I claim is:
‘
'
1. In refrigerating apparatus, the combina
tion of ?rst and second evaporators, means for ' 65
supplying condensed refrigerant to the evapora
tors, a valve structure for controlling the sup
orator I3.» When all refrigerant is vaporized in ply of condensed refrigerant to the. evaporators
the evaporator I2, evaporation is effected at rela
and including ?rst and second discharge ports
70 tively low pressure in the evaporator I3 and con for respectively passing refrigerant‘to the ?rst 70
tinues until the-temperature within thev cham
and second evaporators, means responsive to the'
ber II is depressed to a predetermined value at level of the liquid in the valve structure for suc
which the thermostat 36 operates to deenergize cessively opening the ?rst and second ports as
the motor l6;
'
the‘ level vof refrigerant in the structure rises,
prior to vaporization of refrigerant in the evap
Accordingly, when evaporation is ellected in and means for controlling the passage of re
3
2,133,962
frigerant through said- ?rst port, said control
4. In refrigerating apparatus, the combination
of ?rst and second evaporators, means for 'con
ling means being operative to terminate passage
of refrigerant through the ?rst port, whereby
the level responsive means operates to control
the discharge of refrigerant through the second
densing refrigerant vaporized in the evaporators,
of ?rst and second evaporators, means for con
a ?oat valve, structure for receiving the refrig->
erant condensed by said condensing means, said
?oat structure having ?rst and second outlets for
passing refrigerant to the ?rstand second evap
orators, respectively, and means for selecting the
densing refrigerant vaporized in the evaporators,
outlet of the ?oatv structure which is effective to ‘ '
port to the second evaporator.
,
2. In refrigerating apparatus,-the combination
pass refrigerant.
_
a container for receiving the condensed refrig
5. In refrigerating apparatus; the combination
erant and having ?rst and second outlets con
nected to the ?rst and second evaporators, ‘re
of ?rst and second evaporators, means for .con
spectively, a valve cooperating with the outlets densing refrigerant vaporized in the evaporators,
and movable in response to the level of liquid _a float valve structure for receiving the refrig
erant condensed by said means, said ?oat struc- 1,
15 in the container, said valve opening the ?rst
and second outlets successively as the level in ,ture having ?rst and second outlets for passing
the container rises, and means for controlling refrigerant to the ?rst andisecond evaporators,
the passage of refrigerant through the ?rst out
respectively, and means responsive to tempera
tures produced by the respective evaporators
let and movable to a position wherein the pas
20 sage of refrigerant throughthe ?rst outlet is
for selecting the outlet which is effective to passv “ ‘
prevented, whereby the valve cooperates with
refrigerant.
the second outlet to supply refrigerant to the
6. In refrigerating apparatus, the combination
of ?rst and second evaporators, a compressor for
second evaporator.
‘
3. In refrigerating apparatus, the combina
_
\
circulating refrigerant through the evaporators,‘
25 tion of ?rst and second evaporators, means for
and means including ?rst and second passages '1.
connected to the respective evaporators for con
trolling the ?ow of refrigerant through the evap
orators, said means being responsive to a con
dition of the refrigerant for selectively effecting
condensing refrigerant vaporized in the evapora
tors, a container for receiving the condensed re
frigerant and having ?rst- and second outlets
connected to the ?rst and second evaporators,
80 respectively, a ?oat positioned in response to .the
level of liquid in the container, a movable valve
?ow'of refrigerant in the evaporators.‘
2
7. In refrigerating apparatus, the combination
member associated with the outlets and actuated
by the ?oat in such manner that the ?ow of re-.
of ?rst and second evaporators, a refrigerant’
condensing unit for circulating refrigerant
through the evaporators, and means including
?rst and second refrigerant passages respectively 35
means for controlling the passage of refrigerant connected to the first, and second evaporators
through the ?rst port and adjustable for pre
for selectively controlling the ?ow of refriger
venting the passage of refrigerant therethrough, - ant to they evaporators, said means being actu
whereby the level of liquid in the container rises ated in response to variable levels of refrigerant ,
condensed by said condensing unit.
40 and the valve member cooperates with the sec
40
ond port for controlling the‘ ?ow of refrigerant
frigerant through the ?rst port is controlled
thereby while the second. port is closed, and
therethrough.
-
.
MALCOLM G.. SEOEMAKER.
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