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Патент USA US2407795

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Sept;4 17, 1946.
original Filed Nov. 8,- 1933
2 Sheets-Sheet 1
Original Filed Nov. 8, 1953
2 Sheets-Sheet 2
Patented Sept. 17, 1946
Glenn Muñiy, Springfield, Ohio '
` Original application November 8, 1933, Serial No.
697,124. Divided and this application January
23, 1939, Serial No. 252,291
2‘Claims. (Cl. 62,--,2)
The invention relates to mechanical refriger
ation, and this application is a _division of the
one which matured into U. S. Patent No. 2,145,773
cause at least a portion of the water from the
tank 86, -which fills them to be frozen. Such
means may comprise an evaporating unit V94
January 31, 1939. ,
which is supported by hangers 88. The evapo
rator 94 is made out of two sheets of metal 98
and Iûll having downwardly tapered openings |02
in which cups 92 seat and the sheets `98 and
An important object of this invention is to
provide 1 for control of refrigeration systems
wherein certain heat exchange elements are re
|08 are suitably formed and secured as by weld
ing to form an annular chamber íû‘l of material
, quired to act sometimes to absorb heat and some
times to give 01T heat.
depth around each of the openings H32. Between
the chambers Iü4’the sheets 98 and |80 are
formed to provide passages Hi8 which connect
A further` object is to improve and simplifythe
means for controlling now of refrigerant liquid in
The above being among »the objects of the
the chambers in series.
Actually the cups 92 are arranged in two series
present invention, the same consists in certain
novel features of construction, combinations of 15 and, as indicated in Figs. 1 and 5, the chambers
parts and steps of operation that will hereinafter ,
184 for the cups 92 are likewise arranged in two
series and indicated in the ñgures referred to,
be described with reference to the accompanying
as 22 `and 26, respectively.` The series 22 and
drawings, and` then claimed, -having the above
26 are connected together at one end by a flow
and other objects in view.
In the accompanying drawings which illustrate 20 restricting device, here shown more or less di
agrammatically as a capillary tube 24. The op
suitable embodiments of the present invention
posite ends of the series 22 and 26 are connected
and in which like numerals refer to like parts
by tubes 20 and 28, respectively, to a valve I8,
throughout the several different views,
. Fig. 1 is a diagrammatic view of a refrigerator
which will hereinafter be fully described. These
system embodying the invention and showing the 25 tubes serve in one position of the Valve I8 to
connect the corresponding end of the series' 22
reversing valve in section for clearnessu of illus
with the condenser I6 and the corresponding end
v- Fig. 2 illustrates an alternative means for oper
of the series> 2B with the suction side of the com
ating a valve mechanism equivalent to that shown
pressor I2, and in the'opposite position of the
in Fig. 1,
Fig. 3 is a vertical sectional View through a
refrigerator cabinet in which parts of the re
frigerating system are mounted,
Fig. 4 is an enlarged sectional View of the
30 valve to reverse this connection.
Thus, the capil
lary tube 24 serves alternately to control the eX
pansion of the refrigerant iirst from one of the
series 22 or 26 into the other, and then .to con
trol its expansion in the opposite direction.
portion of Fig. 3 enclosed by the circle 4, and
Fig. 5 is a fragmentary, diagrammatic view
Any type of refrigerating mechanism having
- suitable cyclic Voperation may be adapted for use
showing a modified form of control.
The apparatus embodying the present invention
in connection with the present invention. The
particular mechanism shown more or less di
agrammatically at lû, Fig. 1, includes a com
is shownin connection with ice makers for pur
pose of illustration. Referring ñrst to Fig. 3, a 40 pressor I2 driven by a suitable electric motor
I4 and discharging refrigerant therefrom to a
refrigerator cabinet is indicated generally at 88
condenser >I6 from which it is conveyed to the
and as having wall sections including the top 82 '
reversing valve I8, which, in the position shown,
suitablyfinsulated as in conventional construc
discharges liquid refrigerant therefrom into the
tions to reduce the amount of> heat transfer
through them. As in conventional constructions, 45 tube 28. The refrigerant, after having passed
through the series 22 of heat exchanger passages
the cabinet 80 is provided with a swingable door
iû4 and |86, ñows through the capillary tube 24
84;` A water tank 86 is supported from the top
and thencethrough the series 28 of the heat ex
82 throughbrackets 88 and heat exchanger as
changer passages. In the latter passages the
sembly ‘94 and has a removable top S0. Formed
infor ñxed to the lower surface of the water tank 50 refrigerant is gasiñed and then returns through
the tube 28, valve I8, and tube 3U to the suction
86A and open at their top to the interior thereof
are two parallel rowsV 0f downwardly projecting f side of the compressori 2.
Any suitable or conventional type of control
cups 92.
,_ .
mechanism may be provided for controlling the
Means are provided to refrigerate at least a
portion of the surface ofA the cups 92 so as to 55 operation of the motor I4. 'I'he particular con
,Y trol indicated `diagrammatically is of the thermo- y ' frigerant already in series 22 of the heat eX
static type including a control bulb 32 secured
in Contact with the suction tube E@ so as to
prevent frosting of the suction line. A control
switch indicated diagrammatically at Sil is con
nected in series with the motor i4 and a suitable
changer chambers |64 and around cup 48 is now
ters the valve through tube ¿52, passes through>
ice is being Vformed in cups Q2 served by series
free to evaporate and pass through tube B6 and
port S2 to the suction tube 30, thus starting the
refrigeration of the cups 92 in the series 22, and
cup «118,> which is continued with refrigerant which
source of electrical energy 3%». Breferably the
passes throughthe capillary tube
switch 35i is of the adjustable type.
The result is the melting free of' the ice in cups
In Fig. l the valve mechanism is shown with
S2. served by series 26 of the heat-exchanger
parts in position for refrigerant flow as indicated* io chambers HB4, and ofice in cup 5B, and a drop of
by the solid arrows. The liquid refrigerant en
pressure inthe tube 68 and chamber l0, while
valve port Affi, and thence through tube -20- to the Y' ‘ 22, andî in cup 48, preparatory to the next re
upper series 22 of the heat-exchanger chambers Y
versal` ofV the valve mechanism, which will bring
the operation. backk to the starting point of this
Hifi, which is at the momentinthe heat-dissipatlf
ing `portion'of the cycle. The liquid refrigerant; »_ ' description.. Theice 5I in cup 5!) will free itself
nowv passes through the capillary tube 24,. whichV ï
and Yfloat upwardly out of the cup like the other
retards its flow enough to cause evaporationin Y ice, or will remain in the cup and melt enough
the lower series 2B of the heat-exchanger cham
Vto reduce the pressure, according to whether the
bers led-_ The vapor then goes. through the tube 20 cup. is connected with thebottom of a tan-kof
2‘3‘, the Valve port 46, and the tube 30 to the eon-~A
water, or closed.
densing unit l0'.
The tube 3l)Í may include> an additional-wapo# '
This assembly includes two temperature re
rator 3| for the' purpose of cooling cabinet air,
sponsive control- elements, in the form shown in. - in which> case no damage will result from? a slight
Fig. l, as special ice cups 45 and 50~ which may 25 leakage of the valves whichA might allow refrig-be attached to and open into the waterv tank 86,
erant to. “short-circuit” and pass from tube` 42’
and around the cups 4B and 5o are coils 23 and 2l,
through the closed valve port 46er 64, to-tube 30:. Y
Coil 23 is connected with` the re`
frigerant passage‘that'serves the upper series 22
of the heat-exchanger- chambers IM, while thek
VlAs an alternative arrangement, tubes] 68fV and
î 'l2 can be crossed» and providedïwithbulbs 6-9« and
13 which contact tubes 20 and-‘2B 'respectively-así
coil ‘êî’is‘connected in the circuit'for the lower
shown in Fig. 5. Bulbs 69 and 13 _are Huidétig-ht
and ilìlled with carboni-dioxide orothe?ïveì‘y--vola
tile» duid-ï which- then-` operates the diaphragms-ïü
' Thel cups @il and 5e are relatively deep and
small in diameter, withfeach coil 23V and 2l' ar-V
ranged'to- cause, during its active period of re-` ~
è' and 68V tore?fect operation» or the valve I8» in the»
same gene-ral- manner- asl inlthe Vfirstv dèscri-bedí
frigerationfreezing in the upperpart of the cor-»
responding cup first. Thus, while rings of ice are
forming» in the set of cups 92 served by series 25
ice formed in cup 5b will become a solid plug or 40
cone of ice 5l as shown, and the further, down
ward freezing of' ice belowthis plug will pro
trolledy electrical circuit supplied through con
duetors isV andi is of Fig. 2- tornei vai-ve 'meeh
anism i3». In eitherr ñg-ure,b liquid» refrigerant re
ceived _through the tube 42 is deliveredfthrougïh
the tube 2e while suction'vaporreceived through
duce pressure> on the water in the bottom of the
cup and in thev tube [§23v and chamber'fïß, as well
Y i
be actuated by other means, ¿such as
of the’heat-exchanger chambers IM, the ring of
as upon the diaphragm 52.
>The valve mechanism ofïlïï'iïg. Lmay- optionally
the tube 28v is delivered-'through the tube»` 30, as
indicated by solid arrows. Then, when thevalve
VAs the formation of ice 5I progressesy in cup
50‘ the pressure upon diaphragm 52 will increase,
finally causingthe diaphragm 52 to snap into po
sition 52', pushing the valve stern 55 and Vits
mechanism is reversed,l liquid refrigerant re
ceived through- the tube- 42; is delivered through
the tube 28, and suctionA vapor received through
the tube 2U is delivered through the tubeg30.A
valves 56 and 58~ along- their common axis until 50
FromI the foregoingit will be- readily'V apparent
'the valve 5E closes the port 4S and the valve 5S
that when the cups 92 associated with either'fthe
closes the port ed. At the same time, the stem 5t
series 22 or 26 are subjected- to refrigerati-ng@
engaging the diaphragm {il}` will cause it to snap
fect, the water‘in such cups will-befrozen' over
into position Eli’. It will be seen that the high
the area of contact between such? cups and the
pressure of liquid refrigerant acting upon dia 55 evaporator 94. VSuch water frozen in the` cups
phragm of!! has been urging it in vthisl direction
will build up as a ring'ofice` m8-, vandfsl-iould the
constantly before this movement occurred, but
refrigerating> effect: exist for a suiñcieritly‘long
the diaphragms are so designed that they will not
time, it will be apparent that the ring L08- will
snap into reversed position under the highest
eventually become a disk. Preferably, however;
possible pressure of the liquid refrigerant. The 60 the relative size of. the chambers IMÍ and'ltlie
higher pressure of the expanding ice is, however,l
diameters of the cups`are so proportioned? that
ample to snap both of the diaphragms and to
the ring Hi8 will notbuild up into. a completedisk
move the valve 58 against the pressure of the
liquid refrigerant, aided by the liquid pressure '
that is already exerted upon diaphragm 60.
This movement of the valve stem and its valves
has now opened the ports 62 and 64, simultane
ously closing ports M and 46, which provides new
' paths for both liquid andl gaseous refrigerant, as
indicated by the broken line arrows. The inrush
of warm liquid refrigerant through port 64 and
'tube 28 warms up the cup 50 and the series 26 of
heat exchanger chambers |04. Its flow is retarded
by the capillary tube 24, through which refriger
' ant now iiows in a reversed direction.
The re
during the active period of one. cycleof operation
of` the refrigerating unit for one series of cups.
When the; valve mechanism I-8 ori-8 is ac
tuated to discontinue. the active period ofrefrig
eration of one series ofv cups- 92v and begin _acti-ve
refrigerationof the other series of' cups; warm ref
frigerant will be circulated through-,the cham
bers YHill associated'v with thatseri-es of cups 92
in which ice has just previously been frozen„ and
active~ refrigeration of which. has nourr been
stopped, thuswarming thi-elast series of: cups and
75 releasing the ice therein to float free and up
wardly in the Water in tank 86. Thus, the last
mentioned series of cups is conditioned to freeze
a new batch of ice as soon as the valve I8 is
again reversed.
2. In a refrigerating system, a pair of heat ex
changers, means including a capillary passage of
small cross section and considerable length con
necting said heat exchangers in series, said capil
Ul lary passage acting as a refrigerant flow con
What is claimed is:
trolling means, and means for causing refrig
1. In a refrigerating system, a pair of heat ex
erant to reverse its direction of flow through said
changers, means including a capillary passage
heat exchangers and capillary passage in re
connecting said heat exchanger in series, said
sponse to energy resulting from a thermal effect
capillary passage acting as a refrigerant ñovv
controlling means, and means for causing re 10 associated With one of said heat exchangers.
frigerant to reverse its direction of flow through
said heat exchangers and capillary passage.
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