close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2133960

код для вставки
0a.v 25-, 1938.
G; s. MCCLOY
REFRIGERATING APPARATUS
v 2,133,960’
Filed Dec. 16, 1936.
Z3
’ INVENTOR
GRAHAM EMS C LOY :_
BY 2% <'
~ ‘ATTORNEZ?
f 2,133,960
Patented Oct. 25-, 1938 -
, ~ UNITED STATES PATENT OFFICE
'
REFRIGEBATING APPARATUS
Graham S. McCloy, East Longmeadow, Masa,‘ as
signor to Westinghouse Electric & Manufactur
ing Company, East Pittsburgh, Pa, a corpora
tion of Pennsylvania
Application December 16, 1936, Serial No» 116,102
r 12 Claims.
(Cl. 62-115)
My invention relates to refrigerating apparatus condensed refrigerant from the float valve struc~
wherein the quantity of refrigerant available for ture 21 to the evaporators i3 and i4 and ‘is pref
erably connected to the evaporator 13, as shown.
Further reference to the admission of refrig
A further object of my invention is to provide erant to the evaporators will be made hereinafter.‘
GI
improved means for varying the amount of
The structure 24 will now be described in detail.
The upper portion of the casing 25 which is
refrigerant present in one or more evaporators.
A further object of the invention is to provide preferably of cylindrical form, de?nes the reser
an improved unitary structure for varying the voir 26 for» storing refrigerant during certain
10 amount of refrigerant available for circulation in periods of operation of the apparatus. The con 10
densed refrigerant conveyed by the conduit 23 is
a refrigerating system and for controlling the ad
mission of refrigerant to one or more evaporators.v discharged into the reservoir 26. The chamber‘
29 at the bottom of the casing 25 receives con
While not so limited, my invention is particu
larly applicable‘ to two-temperature refrigerating densed refrigerant from the reservoir 26 through
circulation is varied and has for an objectto
provide improved apparatus of this kind.
15 systems of the type disclosed and claimed in the
copending application of, Leslie B. M. Buchanan,
Serial No. 15,003, ?led'April 6, 1935, and assigned
to Westinghouse Electric 8; Manufacturing Com
pany.
The embodiment of my invention dis—
20 closed hereinafter relates to a two-temperature
system of the type shown in this application.
The foregoing and other objects are eifected by
my invention as will be apparent from the fol
lowing description and claims taken in connec
tion with the accompanying drawing forminga
part of this application, in which: .
Fig. 1 diagrammatically shows a two-tempera
ture refrigerating system constructed and
arranged ‘in accordance with my invention, cer
30 tain portions of which are ‘shown enlarged; and,
a conduit 32 or, through a passage 33 under con
trol of a valve 34.
15
The conduit<32 includes a
portion 35 ?xed preferably in the wall 28 and a
movable portion 35 that is adjustable vertically
with respect to the‘fixed portion 35. _ Preferably,
the conduit portion 36 is threaded on the ?xed 20
portion 35 and is rotatable with a stem 31 extend
ing through the casing 25. The upper or mov
able conduit portion 36 is provided with one or
more inlets 38 for the passage of refrigerant from
the reservoir 26.
25
I As shown best in Fig. 2, the stem 31 is prefer
ably of hexagonal formation where it engages the
conduit‘ portion 36, so that rotation of the stem
31'. effects rotation of the conduit portion 36.
The conduit portion 36 is slidably mounted ‘on 30
Fig. 2 is a section taken along the line 11-11 of ‘ the stem 31 so that movement thereof axially of
Fig. 1.
»
.
~ the stem 31 is permitted.
.
Referring to the drawing, a two-temperature
refrigerator structure is shown generally at it]
35 and includes relatively low and high tempera
ture zones or chambers H and 92, respectively.
The chambers H and 52 are refrigerated by re
The stem 31 includes
an upper circular portion 39 rotatably mounted‘
within a fitting M that isvsecured to the casing
25. An end d2 of the stem 31 is suitably formed
for‘ engagemenVwith an adjusting tool or wrench
whereby the stem 31 may’ be- rotated. Packing
35
spective low and higher temperature evaporators ‘ shown at £13 may be employed between the
l3 and‘ i4. Refrigerant vaporized in the evapo
40 rators l3 and I4 is withdrawn through a conduit
l5 by means of a compressor 16 driven by a.
motor H, which de?ne elements of a condensing
rounded portion 39 of the stem and the ?tting 4|
for preventing escape of refrigerant fr‘om‘the' cas 40
ing 25. r A cap 44 is threaded on the ?tting 4|
unit, generally indicated at l8. The condensing.
for further preventing escape of refrigerant and
is removable so that the end‘42 of the stem 31
unit I8 includes a condenser 19 cooled in any
is accessible ‘for adjustment.
I
‘
The passage 33 is preferably formed in a cyline 45
45 suitable manner such as, for example, by a fan .
drical valve cage 45 secured in the wall 28. The
- 2|.- The condenser I9 is connected’to the com
pressor It for the reception of the compressed
.gas by means of a conduit 22.
. _
Liquid refrigerant is conveyed from the con
50 denser ll9 through a conduit 23 to a structure
‘valve cage includes inlet ports 46 for the passage
of refrigerant/from the reservoir 26 when the
valve 34 is raised and seat 41 is formed in the
valve cage 45 for the ‘valve member 34.. ‘Means
is provided for actuating the valve 34 and pref
24 shown in enlarged scale and including a cas
ing 25 which de?nes a reservoir 26 and a ?oat erably. includes a solenoid winding 48 arranged
" valve structure 21. A partition 28 separates the ~ exteriorly of the casing 25 and a core 49 disposed
?oat valve structure 21 into the reservoir 26 and
55 a chamber 29.
A conduit 3| serves' to convey
50
within the casing and subjected to the ?eld pro
duced by the winding 48. Energization of the 55
2 ’,
2,188,960
winding, 49 effects upward movement of the core
49 and‘ deenergization of the winding permits the
core 49 to drop by gravity. The core 49 and valve
temperatures in both chambers are below values '
at which their respective thermostatic switches
close and, therefore, the motor l1‘ and compres
34 are secured together by a rod 5| so that the sor l6 are inactive. The reservoir 26 is empty
vvalve 34 is opened and closed as ;the core is raised which indicates that both evaporators l3 and I4
and loweredby the action of the winding 48. contain liquid refrigerant and that. the previous
It will be understood that other suitable means cycle of operation eifected refrigeration, of the‘
may be provided for actuating the valve 34 and high temperature chamber l2.
_
that the means disclosed is shown by way of
Assume a rise in the low temperature chamber
10 example. However, by providing a solenoid in
II to the value at which the thermostatic switch 10
which the core is disposed inside the casing,'it is ‘58 is closed. The motor I‘! is energized thereby '
not necessary to have'any moving actuating mem
and the‘solenoid winding 49 remains deenergized.
, ber pass through the casing with the possibility Accordingly the valve 34 is in its closed position
of gas- leakage. The embodiment disclosed is. and operation of the compressor I6 is initiated.
Refrigerant present ‘in the evaporator ‘I4 is va 15
~15 therefore, desirable in this respect.
~ The ?oat valve structure 21 of which the cham
poriz'ed and condensed in the condenser l9. The
ber 29 is a part includes a valve member 52 that lique?ed refrigerant is delivered for storage in
is actuated by a ?oat 53. The valve 52 cooper ~the reservoir 26 until the level of the liquid rises
ates with a seat 54 preferably formed in an out
to the over?ow inlets 38 in the conduit 32. Some
20 let member 55 that is ?xed in the casing 25. cooling of the high temperature evaporator I4
As shown, the conduit 3| is secured to the outlet is effected at this time by the refrigerant va
member 55. The valve 52 is moved in opening porized therein but it is of short duration as the
and closing directions as the level of the liquid A refrigerant is soon vaporized.
refrigerant in the chamber 29 rises and falls,
The pressure ofthe refrigerant in the evapora
tor i3 is reduced by the compressor l6 and the
25 respectively.
vaporized refrigerant is'conveyed through the
It will be understood that the charge of refrig
erant in the system is such that when the reser
evaporator l4 to the condenser l9 by the com
voir 26 is empty, the evaporator I3 is substan
pressor l6. The liquid refrigerant delivered to
o
tially ?lled with refrigerant, and liquid refriger
ant occupies a portion of the evaporator l4.
so When~refrigerant
is stored in the reservoir 26,
‘ the evaporator l3 contains a substantial amount
of liquid refrigerant and the evaporator i4 is
dry. As shown, the liquid supply conduit 3| ad
35 mits refrigerant to the evaporators l3 and I4 in
such manner that refrigerant ?ows into the evap
orator IS in preference to the evaporator [4.
When the evaporator I3 is ?lled, over?ow of re
frigerant into the evaporator vI4 is effected.
The amount of refrigerant present 'in the low
'40 temperature
evaporator l3 during periods when
it .is operated may be varied by varying the
structure 2‘! and is admitted to the evaporator
I3 under control of the ?oat operated valve 54.
Operation of the compressor [6 progressively
‘decreases the pressure and temperature of the
refrigerant in the evaporator 13 to the value at 35
which thermostatic switch 56 opens to terminate
operation of the compressor l6.
» Assume a rise in temperature in the chamber
l2 to the value at which the thermostaticswitch
adjusting the movable conduit member 36 up
wardly, more refrigerant is stored in the reservoir
26 and less is present in the evaporator l3. The
total charge of refrigerant in the system is cir
culated during periods when the valve 34 is in
29 and effects full opening of the valve 54. Re
frigerant ?lls the evaporator l3 and over?ows
into the evaporator l4 and is rapidly vaporized
45
due to the relatively high temperature thereof.
>_
. its open position and ?lls the evaporator l3 and
50
structure 32 to the chamber 29 of the ?oat valve 30
59 is closed. The motor I1. and the-solenoid 49 40
are energized by a circuit including the conductor
62. Accordingly, operation of the compressor l6
v‘is initiated and the valve 34v is raisedlfrom its
seat 41. Refrigerant present in the reservoir 26
passes through the passage 33 to the chamber
amount of‘refrigerant in the reservoir 26. By
45
' the reservoir '26 over?ows through the conduit
a .substantial portion of the evaporator l4.’
Automatic control of the system may be ef
> fected by thermostats 56 and 51 disposed in the
low and high temperature chambers II and I2
respectively. The thermostats 56 and 51 open
and close their contacts in response to predeter
55
mined) low and high temperatures in their re
spective chambers. The thermostat switches are
shown at 59 and 59. It will be understood that
the thermostat 51 is set to maintain a higher
mean temperature in the chamber [2 than that
60
maintained in the chamber II by the thermo
stat 56.
’
‘
At this time the entire charge of refrigerant
is available for circulation so that both evapora- '_50
tor l3 and ‘f4' contain liquid refrigerant. As the
evaporator I3 is substantially ?lled with con
densed refrigerant, a seal is. de?ned for prevent- ,
ing refrigerant vaporized in the high tempera
ture evaporator l4 from condensing in‘ the low
temperature evaporator l3. vaporization in the
low temperature evaporator I3 is not effected
at this time as the temperature of the evapora
tor I3 is lower than the temperature of vaporiza
tion corresponding to the pressure of the con
tained refrigerant.
‘
'
.
'
The source of power for the solenoid winding
The compressor l6 operates to decrease the
48 and the motor I‘! is represented by the line pressure and temperature of the refrigerant in
conductors L1 and L1. The motorv I1 is energized the evaporator l4 until the thermostat 51 opens
65
65 by the thermostat switch 58 whenclosed in re
' its switch 59 in response to a predetermined low
sponse to a predetermined high temperature in temperature within the chamber l2,- at- which
the chamber II, the circuit for the motor I‘! in
time the compressor 16 is stopped and the valve _
cluding a conductor 6|. when the thermostatic 34 is moved to its closed position due to the de
switch 59 is closed, the motor I ‘I is energized by energization of the winding 49. Theapparatus
v70 acircuit including a conductor 62 and the sole-1 is now in the position shown in the drawing. 70
noid winding 49.
’
Operation
The positions of the various elements of the
75 system as shown in the drawing indicate that the
One or the other of the thermostats v5|; and
51 may be given preferance when both call for
cooling. As shown, the thermostat 56 is the pre
ferred thermostat due to the fact that the con 75
3
2,138,960’
" ductor 6| de?nes a shunt across .the winding
48 when both thermostatic switches 58 "and 59 are
closed, and, therefore, the winding 48 is deener
10
zation and means for withholding a predeter
mined quantity of condensed refrigerant from
circulation whereby the amount of refrigerant
gized and the valve 34> is in its closed position.
Accordingly, refrigerant is stored in the reser
voir 26 and condensed refrigerant is present for
vaporization in the low temperature evaporator
l3 only. It will be understood that preference '
present in the evaporator is reduced and substan
may be given to the high temperature thermostat
neath the reservoir for receiving. condensed re
frigerant therefrom and an adjusting device for 10
varying the storing capacity of the reservoir and
57 if desired.
’
'
-
I have shown my improved system applied for
tially ?lls the ?rst evaporator portion; said means
including a casing structure for de?ning ares
ervoir for the withheld refrigerant, an expansion
device for the condensed refrigerant disposed be
refrigerating two zones of a refrigerator and in
extending exteriorly of the‘reservoir
cluding two evaporating elements but it is to be
4. In refrigerating apparatus, the combination
understood that it may be applied to single evap
of an evaporator, means for condensing refrig
15 orator systems in which the amount of liquid re
erant vaporized in the evaporator, a casing de?n 15
frigerant present in the low side thereof is to be ing a. reservoir for- receiving condensed refrig
varied.
erant from the condensing means and an ex;
From the foregoing, it will be apparent that I pansion device disposed at a lower level than the
have provided an improved refrigerating system reservoir for controlling the admission of refrig
having means for withholding condensed‘ refrig
erant to the evaporator, a’ conduit communicat 20
erant from circulation, wherein the amount of ing with the reservoir and the expansion de
refrigerant withheld may be readily varied and vice, said .conduit having its inlet disposed at v
wherein a compact unitary structure is provided. variable elevations within the reservoir, means
for varying the quantity of refrigerant available for adjusting the elevation of the conduit inlet, ,
forcirculation and for controlling its admission ',valve means controlling communication between‘ 25
to the evaporator or evaporators. While I have the reservoir and the expansion device and
shown'a refrigerating system of the compressor
opened .and closed for respectively releasing re
condenser-expander cycle, it will be understood frigerant from the reservoir and for storing the
that my invention is applicable to other types same therein, and means for actuating said valve.
of refrigerating systems;
‘
'
5. The combination as claimed in claim 4 30
While I have shown my invention in but one wherein the valve actuating means is disposed at
‘form, it will be obvious to those skilled in the least in part exteriorly of theeasing.
,
art that it is notv so limited, but is susceptible
6-. The combination as claimed in claim ,4
of various changes and modi?cations» without wherein the valve actuating means is electrically
departing from the spirit thereof, and I desire,
35
therefore, that ‘only such limitations shall be
. 7. In‘two temperature refrigerating apparatus,
\placed thereupon as are imposed by the prior art the-combination of low and high temperature
or as are speci?cally set forth in the appended evaporators, means for condensing refrigerant
claims.
,
vaporized in the evaporators and means for con
What I claim is:
,
'
_
veying the condensed refrigerant to the evapora
L In a two-temperature refrigerating system, tors and comprising means for decreasing or in- ,
they combination of a pair of evaporator elements, creasing the effective charge _ ‘of refrigerant
means for- condensing refrigerant vaporized inv whereby condensed refrigerant is supplied to the
the evaporator elements, means for conveying the .low temperature evaporator only for. vaporiza
condensed refrigerant to the evaporator elements tion at low pressure or is supplied to both evap 45
operated.
.
>
_
predetermined quantity of condensed refrigerant
orators for vaporization primarily in the high
temperature evaporator at relatively high pres
from circulation at certain times during the o -
sure, said charge varying means including a res
for vaporization and means for withholding a -
- eration of the system, whereby condensed refrigl
50 erant is delivered to only one of ‘the 'evaporatoif
elements at that time, said refrigerant withhold;
ervoir for condensed refrigerant, any expansion
device for receiving condensed‘ refrigerant from 50
the reservoir and for controlling its admission
to the evaporators, a conduit {providing com
the amount of refrigerant that may be withheld ' munication between-an upper portion of the'res- .
from said one evaporator element.
ervoir and the expansion device.and having at
55 2. In a refrigerating system, the combination least a portion thereof adjustable, means for ad
of an evaporator having ?rst and second .por-i justing said conduit portion upwardly and down
7 ing means including an adjustment for varying
tions, means for condensing refrigerantvapor
ized in the evaporator, means for conveying the.
condensed refrigerant to the evaporator for
vaporization and means for withholding a pre
determined quantity of condensed refrigerant
from circulation whereby the effective charge of:
refrigerant in the system' is reduced and con
densed refrigerant is delivered to the ?rst evap
orator portion only, said refrigerant withhold ‘
ing means including a casing structure for de
?ning a reservoir for the withheld refrigerant
and an adjusting device for- varying the storing
wardly in the- reservoir, means providing com
munication between a lower portion of the reser-'
voir'and the expansion device, a valve associ
ated with the last-named means,_and means for 60
opening and closing said valve.
_
8. In a refrigerating system, the combination
of ?rst and second evaporators, means for con
densing refrigerant vaporized in the evaporators,
a casing de?ning a reservoir and‘ a ?oat valve 65
structure therebeneath, said ?oat valve control
.ling‘ the admission of refrigerant to the evapo
rator, means for conveying‘ the condensed re
capacity of the reservoir and readily accessible frigerant to ‘the reservoir, an over?ow conduit
exteriorly of‘ the casing.
’
_
'
communicating with an elevated portion of the 70
3. In‘ a refrigerating system, the combination reservoir for conveying refrigerant *to‘the ?oat
of an evaporator having ?rst and second portions, valve structure, said over?ow conduit including
means for condensing refrigerant vaporized in an adjustable portion, ‘means for adjusting the ‘
1."
the evaporator, means for conveying the con-
conduit portion upwardly and downwardly where
densed refrigerant to the evaporator for vapori
by the storage capacity of the reservoir is varied,
as
4
9,183,980
means de?ning a passage for providing com
munication between a bottom portion of the res-_
frigerant to the reservoir and means for convey
ing condensed refrigerant from the ?oat cham
ervoir and the ?oat valve structure, a valve con
ber for vaporization.
trolling the passage, and means responsive to de
mands for refrigeration by thei'evaporators for
opening and ‘closing the valve, whereby as the
valve is closed refrigerant is stored in thereser
voir and condensed refrigerant is supplied to the?
?rst evaporator only and when ‘the valve is open
10 the stored refrigerant is released and substan
tially ?lls the ?rst evaporator and at least a por
tion of the second evaporator.
'
9. In refrigerating apparatus, the combination
of a unitary casing structure de?ning a ?oat
valve chamber and a reservoir thereabove, avcon
duit providing communication between the ?oat
. valve chamber and an upper portion of the reser
voir, said casing structure including a passage
providing communication between a bottom por
20 tion of the reservoir and the ?oat valvechamber,
a valve controlling said ‘passage, means for actu
ating the valve, means for admitting condensed
refrigerant to the reservoir and means for con
veying ‘condensed refrigerant from the ?oat
chamber for vaporization.
\
x.
10. -In refrigerating apparatus, the-combination
of a unitary casing structure de?ning a ?oat
valve chamber and a reservoir thereabove, a con
duit providing communication between the ?oat
30 valve chamber and an upper portion of- the reser
voir, means for adjusting said conduit upwardly
and downwardly with respect to the reservoir,
said casing structure including a passage pro
viding communication between a bottom portion
35 of the reservoir and the ?oat valve chamber, a
valve controlling said passage, means for actuat
ing the valve, ineans for admitting condensed re
-
-
, 11. In refrigerating apparatus,‘ the combina- '
tion of ' an evaporator, means for condensing
refrigerant vaporized in the evaporator, a casing
de?ning a reservoir for receiving condensed re
frigerant from the condensing means, means for
conveying therefrigerant from said casing to the
evaporator and including a conduit, said conduit
having its inlet disposed at variable elevations
within the reservoir, means for adjusting the ele
vation of the conduit inlet, valve means con- >
trolling communication between the reservoir and
said conveying means, and opened and closed for 15
respectively releasing refrigerant from the res
ervoir and for storing the same therein, and
means for actuating said valve.
a
12. In refrigerating apparatus, the combina
tion of an evaporator, means for condensing
refrigerant vaporized in the evaporator, a casing
de?ning-a reservoir for receiving condensed re
frigerant from the condensing means, means for
conveying refrigerant‘ from the casing to the
evaporator and including a conduit structure, 25
said structure having a conduit portion secured '
to the casing, and a rotatable conduit portion
threaded to the ?xed conduit portion and having
an upper portion thereof in communication with
the reservoir, a rotatable stem extending exte
riorly of the casing and splined to the rotatable
conduit portion, means de?ning a passage for
providing communication between a bottom por
tion of the reservoir and said vconveying means, _
a valve controlling the passage and means for
actuating said valve.
.
.
GRAHAM‘ S. McCLOY.
-
Документ
Категория
Без категории
Просмотров
0
Размер файла
676 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа