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Патент USA US2115120

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I April 26, 19384.
> 1.. A. PH-I.LlPP
v 7
Original Filed April 5, 1935
Patented Apr. 26, 1938 ‘
' 2,115,120‘
nnrmoana'rmo arraaa'ros
Lawrence A. Philipp, Detroit. Mich, assignor, by
Nash-Kelvinator Cor
mesne assignments,
poration, Detroit, Mich” _: corporation of Mary
riginal application April 5, 1933, ‘Serial No.
664,523. Divided and this application March
11, 1935, Serial No. 10,467
1 Claim. ,(cl. 62-126)
Fig. 4 is a view in cross section of a refrigerant ‘j
accumulator embodying features of my invention.
This invention relates to refrigerating appara
tus, and more particularly to refrigerating sys
terns of the ?ooded type.
Referring to the drawing, a refrigerant evap
orating element 22 is shown to which is opera
tively connected a refrigerant condensing ele- 5
This application is a division of my copend
5 ing application, Serial No. 664,523, ?led April 5,
1933, for Refrigerating apparatus, and issued as
' ment 24.
Patent No. 2,021,924, Nov. 26, 1935.
One of the objects of my invention is to pro
vide a refrigerating system of the type includ
ing a condensing element and a ?ooded evaporat-‘
ing element with a refrigerant accumulator,
which serves at all times to prevent the'?ow of
liquid refrigerant from the evaporating element
to the condensing element.
Another object of my invention is to provide a
refrigerating system of the type including a con
densing element and a ?ooded evaporating ele
ment with a refrigerant accumulator of sufilcient
size to permit variations in the charge of refrig
erant admitted to the system without the pos
2O sibilities of circulating liquid refrigerant from the
evaporating element to the condensing element.
Another object of my invention is to provide
a refrigerating system of the type including a
condensing element, evaporating element, and a
high side ?oat mechanism, with a refrigerant ac
cumulator at the outlet of said evaporating ele
ment, which accumulator is of su?icient size to
accommodate any liquid refrigerant which may
be circulated through the evaporating element
30 either during normal operation of the system or
all of the liquid refrigerant contained in the sys
The evaporating element 22 comprises, in gen
eral, a sleeve 26 arranged for receiving a plural
ity of ice making receptacles (not shown). A re- ;
frigerant expansion coil 28_ is sinuously wound 10
around three sides of the sleeve 26. Liquid re’
frigerant issupplied to the refrigerant "evapora
tor 28 through a liquid supply conduit 30.
An -
elongated refrigerant accumulator 32 is horizon
tally disposed along the top wall of the sleeve 26. 15
An outlet portion 36 of the coil 28 is ‘connected
to the accumulator 32.
The refrigerant condensing element 24 com
prises, in general, a compressor“, motor 43 for
operating the compressor, condenser 45, and a
combination liquid refrigerant receiver and high
side ?oat mechanism 46. The compressor with
draws evaporated refrigerant from the element
22 through a vapor return conduit 48, compresses
the gaseous refrigerant and delivers it to the con
denser, wherein it is lique?ed and from which it
is delivered into the housing of the receiver-?oat
valve mechanism. Liquid refrigerant is delivered
to the element 22 through the liquid conduit 30
under the control of the ?oat mechanism 46.
In the refrigerating system hereinbefore de
scribed, I provide a chargeof liquid refrigerant
which is sumcient to permit the delivery of liquid
tem which may be circulated through the evap
refrigerant through the coil 28 and to the outlet
orating element in they event said ?oat mecha- end 36 of coil 28 during normal operation of the
nism becomes faulty in operation, or any other system. Thus, refrigeration is insured through
03 L1
condition causing abnormal operation of said sys
out the entire length of coil 28.
‘tem, to thereby provide for refrigeration through
In order to prevent the slop-over of liquid re
out the entire surface of the evaporating element - frigerant from the outlet 36 of coil 28 into the
by insuring delivery of liquid refrigerant through vapor return conduit 48, I have provided the re
frigerant accumulator-32. Thus, it will be noted
40 said evaporating element to the outlet end there
of without the possibility of passinglliquid re
that any variations in the charge of liquid re
frigerant into said condensing element.
frigerant admitted to the system is immaterial,
Other objects and advantages will be apparent since it would be necessary to rise in the ac
from the following description reference being cumulator to a point above the outlet 50 before
the liquid would be delivered to the vapor con
45 had to the accompanying ‘drawing.
In the drawing:
duit. Thus, it will be noted that the accumula
Fig. 1 is afront view in elevation of a refrig
tor takes care of variations in the charge of re
erant evaporating element embodying features of
my invention.
Fig. 2 is a rear view 'in elevation of the evap
crating element shown in Fig. 5; -
Fig. 3 is an enlarged side view in elevation,
partly broken away, of the evaporating element
shown in Figs. 1 and 2, and showing diagram
matically a refrigerant condensing element; and
frigerant introduced into the system.
In order to prevent the slop-over of liquid re
frigerant into the vapor conduit during any ab
normal operation of the system, such, for ex
ample, as a leaky ?oat valve mechanism, 1 have
constructed the accumulator of su?icient size as
to accommodate all of the liquid refrigerant in 55
the system which is not contained in the coil 2..
Thus, the possibility of frost ‘back of the vapor
conduit or destruction to parts of the compressor
is‘; eliminated, since no liquid refrigerant passes
sure responsive valve 85. This valve intercon
nects conduit Ill and coil 28. The valve 85 main- .
tains the pressures in the supply-conduit 30 sum- '
ciently high enough to prevent refrigeration in
into the vapor conduit ll, Another form of ab
conduit 30 to the extent of collection of frost
normal operation of'the system may include the thereon.
This prevents loss of refrigeration and
continuous insertion of warm substances in the increases the capacity of the apparatus. Any
evaporator to be frozen. When this occurs, the suitable pressure responsive valve may be used
system operates more than normal and evapora- f
for this purpose such, for example, as a weighted
10 tion'takes place in coil 28 much faster than nor
valve proper (not shown) responsive to changes
mally, thus causing more liquid to pass through in
pressures in‘ conduit 30.
said coil.
In a system of the type herein dis
closed, it is usual to place the outlet of the com
bination liquid‘refrigerant receiver at the lower
15 most part thereof. Thus, any leakage of the float
valve mechanism results in passage of all of the
liquid in said receiver into the coil 28. Thus, an
accumulator of suiflcient size to accommodate all
of the liquid in the system not contained in the
20 coil 28 readily serves at all times to prevent the
?ow of liquid into the condensing element or
conduit 48. Preferably, the accumulator is dis
posed on the upper surface of element 22.
Preferably, the system is intermittently oper
25 ated. In order to control the operation of the
system, I provide an automatic switch 10 which
controls the motor circuit to the power mains
‘H. Preferably, the switch is thermostatically
controlled by means of a thermostatic ?uid con
30 taining bulb 13, which is disposed in metallic
contact with the fittingv 8|, which is disposed in
thermal contact with the top wall of sleeve 26
and partially in the path of the circulating air
in the .cabinet in which the evaporator is located.»
In order to prevent refrigeration taking place
immediately upon entrance of the liquid refrig
erant into the supply conduit 30 after leaving
the ?oat mechanism 46, I have provided a pres
Although only a preferred form of the inven
tion has been illustrated, and that form described
in detail, it will be apparent to those skilled in the
art that various modifications may be made
therein without departing from the spirit of the 15
invention or from the scope of the appended
WhatI claim is:
Refrigerating apparatus, comprising a refrig
erant evaporating element of the ?ooded type in
cluding a box-like sleeve providing ‘a'freezing
zone, a refrigerant evaporating conduit in the
form of a serpentine coil associated with three
sides of said sleeve for freezing substances in said.
zone‘and for cooling circulating air exteriorly of
2.5. 5
said zone, a longitudinally extending refrigerant v
vessel extending along the top‘ wall of said sleeve, means for introducing liquid refrigerant into one
end of said serpentine coil and causing same to
flow in one direction only to the terminating end 30
thereof in said vessel and for withdrawing vapor
ized refrigerant from. the gas space in said vessel
and means responsive ‘to changes in tempera
tures in said sleeve for controlling said latter
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