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Патент USA US2127101

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Aug. 16, 1938. ~
,1 2,127,101
Filed March 29, 1937
61 E/VN F. 251. 4 ?ail-‘ER
Patented Aug. is, 193.8
.wwi'i -
, 2,127,101
n, 111., assignor to
Glenn F. QZellhoefer, 8100
Williams Oil-‘O-Matic H ting Corporation,
Bloomington, Ill.-, a corporation of Illinois
Application March 29, 1937, Serial No. 133,510.;
1 Claim. ‘(01. 02-119)
This invention relates to improvements in thev ' even thoughv there is a considerable rise between
absorption type of refrigerating apparatus in the point at which vaporization starts in the
which a solvent such as dimethyl ether of tetra _ evaporator and the point of inlet to the absorber. \
The purpose of, this‘ invention is to‘ provide
ethylene glycol, or a- similar type of chemical
5 forms a solution with a refrigerant such as di
chloromono?uoromethaneror a similar type of .
chemical in an absorber, the solution passed into
a heater or still wherein the refrigerant is re
means-cf returning the solvent from the ?ooded
evaporator rapidly enough to maintain satisfacé
tory concentration of refrigerant in the ‘evapora
Referring to the above example, wherethe
leasedror boiled off the solution and delivered to '
10 - a condenser, collected as a liquid in a receiver, and liquid dichloromonofluoromethane in the con 10
delivered to an. evaporator from which the‘gas
eous refrigerant is returned to the absorber while
the solvent of the solution from which the re
frigerant has been separated in‘ the heater re
15 turns to the absorber. This invention relates
more particularly to the method and means,
when the evaporator ‘employed is of' the ?ooded
type, of returning from‘ the evaporator such
particles of the solvent which invariably are car
ried over with the gaseous refrigerant into the
The single ?gure of the drawing is a'diagram
denser of this type of absorption refrigeration
unit is 95° F. and the saturated refrigerant tem
perature in the evaporator is 40°, F., the refrig
eration required to cool the liqu'idrefrigerant
from the temperature in the condenser to the 15
evaporator temperature of 40° F. is approxi
mately. 14 B. t‘. u.’s per pound, or approximately
13.6% of the total refrigeration effect produced
in ‘the evaporator by the vaporization of one
pound of refrigerant.
This cooling of the refrigerant may be effected
within the evaporator or may be effected by pre
[ cooling ‘the refrigerant before it enters the evapo
rator of-the ?ooded type with the connections to ._ rator. ‘ In ‘pre-coollng the liquid refrigerant from
the condenser or receiver and absorber such as the condenser by the vaporization of refrigerant 25
employed in an absorption type of refrigerating‘ 'taken‘from the‘ evaporaton'it is possible to have »
apparatus as described above. Other elements of a fiow'of refrigerant from the evaporator equiv
alent to approximately 10% of the ?ow of refrig
such a system do not form a part of this inven
tion and, therefore, it is not thought necessary erant from the’ condenser tov the evaporator.
30 to illustratethem. The evaporator illustrated is Consequently, if the refrigerant from the‘ vcon
employed for the purpose of cooling water or ‘ denser has 0.1% solvent and the refrigerant tak
brine, ,as-less- heat transfer surface is ‘required en from the evaporator for pre-cooling theliq'uid
in this method of, cooling than in the method refrigerant has 1% ‘solvent, the amount of sol-v
vent taken with the refrigerant for pre-cooling is
using a dry expansion type of evaporator.
In an absorption refrigeration apparatus or equivalent to the amount of solvent carried into 35
. unit using dimethyl ether of tetraethylene glycol . the evaporator with the refrigerant from the con
' matical representation in elevation of an evapo
as a solvent, and dichloromono?uoromethane as , denser when the rate of flow of refrigerant from
the refrigerant‘, for an example, which operates the evaporator“ to the pre-cooler is 10% of the
at a temperature of 235° F. in the heater,_and, ‘ rate of ?ow from the condenser to the. evapora
40 with a pressure of twenty-eight pounds gauge 11 ' tor. Since concentrationsof solvent in the re 40
the heater, the solvent carried woverwith the frigerant of as ‘much as 3% or.4% is not objec
tionable for operation of the ?oodedlow side, it
gaseous refrigerant as it leaves the heater is ap
proximately 0.1%. This" solvent is then carried follows that it is not necessary to'use more than
over in .solution with the refrigerant from the , one-third to one-fourth of the refrigerant nec- ‘
to the low side. When the refrigerant . essary’ to pre-cool the liquid refrigerant to the 45
vaporizes in a flooded type of evaporator, essen;
. tially all the solvent carried over remains in the
evaporator. In due time, the unit becomes inop
erative due to this accumulation of solvent, unless
evaporator temperature. It is, therefore, con
templated in accordance with this invention to
feed the refrigerant from the evaporator through
a ?xed ori?ce into a pipe connected to the ab
50 provision is made forthe return of thesolvent I sorberand around which is a/concentric pipe
through which flows the liquid refrigerant from
from, the evaporator to the absorber.
the condenser to the evaporator, in a counterflow _'
This difl‘lculty is notv encountered in a dry ex
pansion type of evaporator because the velocity _ to the gaseous refrigerant in the inner pipe.
with these‘ and other objects in view, reference
of the refrigerant vapors carries the solvent
made to the accompanying drawing which il
lustra'tes a preferred embodiment of this inven
tion, with the understanding that-detail changes
The size of semi-?ooded pipe must be small >
enough tocarry proper velocities of gaseous re
may be made without departing from the scope
frigerant sons‘ to sweep, the solvent liberated
i in pipe 2| back to the absorber; also su?lciently
The evaporator. E indicated in longitudinal'
vertical. central section is preferably in the form
of a cylinder provided with ,convex end, closures
' 2 and 3.
large to provide for the delivery of the required >
amount of the refrigerant-solvent mixture to
maintain satisfactory equilibrium of solvent andv
A vertical partition 4 separates the
end closure 2 from the body of the evaporator.
10 A ?oat valve'chamber I is supported on the op
posite end closure 3 with a float-operated valve
to maintain the liquid level, as-shown by the dot
ted lines, in the evaporator and is connected by
pipes 8 and ‘I to the upper and lower sides of
the evaporator respectively.
The pipe Heads the ?uid to be cooled into the
top of the space between the end closure 2 and
partition 4.
The partition 4 supports the ends
of a row of horizontal ‘pipes 9 which extend to
a point adJacent the opposite end closure 3 and
are then bent to return in parallel spaced-apart
relation to the partition‘. The pipes 9,, are ar
ranged to extend normally above the level of
refrigerant in evaporator.
Su?lcient head must be maintained between
low point of the goose neck of the semi-?ooded 10
pipe andv liquid refrigerant level in the evaporator
to insure adequate ‘?ow of refrigerant-solvent
mixture from the evaporator to semi-?ooded pipe
against back pressure built up by frictional re
sistance of gaseous refrigerant in the semi-?ooded 15
The warm liquid refrigerant from the con
denser e?'ects vaporization of the refrigerant in
pipe 20 affording a quite definite and controlled
amount of heat for this purpose and at the same 20
time conserving the refrigeration effect.
This invention contemplates. providing an en- -
largement 22 oi.’ the pipe I‘! through which the
the liquid refrigerant in the evaporator, as sho
pipe 20 passes from a point adjacent the bottom
by the dotted lines, with the respective ends of the evaporator, a sufficient distance to pro
“opening through the partition 4 into the spacev duce the desired effect. The liquid refrigerant
between the end closure 2 and the partition I is conducted from the enlarged portion 22 of‘
and each is preferably provided with thin equally-' the pipe. I‘! adjacent the evaporator by a pipe
spaeed-apart radiation‘plates or ?ns l 0, as shown. 23 leading to the ?oat chamber 5, and the re
'30 A horizontal partition II is arranged between frigerant is conducted from the ?oat chamber
the end closure i‘and the partition?‘ between to evaporator E by pipe ‘I.
the openings of‘ the upper and lower rows of
_ This same type of ‘device may be used in con
the pipes 9, whereby the liquid from the pipe 8 junction with a compressor to-return oil from
is caused to- circulatethrough the pipes l in’ a ?ooded lo_w side'to the crank case of a com-~
the gaseousv refrigerant.‘ It is preferable to ar
range two similar rows of pipes l2 and 'Il below ' ‘What I claim is:
the pipes 9 with partitions I4 and II similar
to partition ll between their_respective open
inas irito the chamber between the end closure
2 and the partition 4, whereby the ?uid is caused
to circulate through the liquid refrigerant wi in.the evaporator E. .The space below the pa
tition I5 is connected to a pipe IQ for conduct
ing the cooled ?uid to‘its destination.
A pipe I‘! leads the liquid refrigerant from the
receiver or condenser of the .apparatus, not
shown, to the ?oat chamber 5 and a pipe l8 leads
the gaseous refrigerant evaporated at the liquid
level in the evaporator to the absorber of th
50 apparatus, not shown._.
This inventio'mcontemplates the prevention of
such solvent as is invariably carried over from
the heater or still with the refrigerant into the
evaporator from collectingthere'in and eventu
ally rendering the evaporator inoperative by‘
providing ,at-the bottom of -the evaporator a}
small ori?ce' or bleeder lsvpreferably of adjust
able size, which opens into a pipe 20 leading
to the absorber ofthe apparatus, not shown.
The pipe 20 is arranged in the formjof a‘goose
neck It ,below the under-side of the evaporator
and may be termed a ‘semi-?ooded container, as
_ the refrigerant with particles of solvent enters
this portion through the orifices".
In an absorption refrigerating apparatus in
cluding a horizontal cylindrical evaporator of the
flooded type provided with a ?oat valve, for
controlling the level of the liquid refrigerant 40
therein, within a chamber, a pipe for leading the
liquid refrigerant from the condenser to the ?oat
valve chamber, a pipe for leading the gaseous
, refrigerant from the evaporator .to the absorber, _. .
and a bleeder ori?ce opening through the bottom 45
of the evaporator into a pipe depending there
from to form a liquid trap and that‘ is‘to then
lead to the absorber, said latter pipe on leaving
the ‘evaporator
through an enlarged sub
stantial section 017 the pipe leading the liquid
refrigerant to the ?oat valve chamber, the size
of the bleeder and the length of said enlarged
section so related that the solvent carried over
from the heater‘ with the gaseous refrigerant and
passing through the ?oat valve is removed from 55
the bottom of the evaporator with a su?lcient
portion of the liquid refrigerant to be volatilized
in passing through the said enlarged section and
the solvent separated therefrom swept into the
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