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Патент USA US2117861

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May 17, 1938.
2,117,861
c. sTEl-:NsTRUP
EVAPORATOR FOR REFRIGERATING MACHINES
Filed Aug. 29, 1956
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lnventor‘ :
Chrîstîan Steenstrup,
by/Í‘íâ
M6.
Attorney.
Patented May i1, 193s
'
`
‘ 2,112,861
AUNITED STATES PATENT OFFICE
cin-nnen Steenstrup, Schenectady, N. y., ae
slgnor to General Electric Company, a corpo
ration of New York
- 'Application August 29, 1936, Serial No. 98,456
3 Claims.
My invention relates to evaporators or cooling
, units for refrigerating machines.
It is an object of my invention to provide an
improved evaporator of the flooded type for re5 frigerating machines, having a header and a plu-
rality of U-shaped depending refrigerant clrcu-
(Cl. 62-126)
a cylindrical header 20 from which it is with
drawn through a suction conduit 2l and is re
turned to the casing I4. 'I'his cycle of operation
continues as long as thecompressor Within the
casing is operating. The temperature within the 5
compartment II is regulated thermostatically in
lating passages and having an improved arrange- the usual manner by controlling the operation
ment for providing a rapid and efficient positive of the motor which drives the compressor Within
circulation of liquid refrigerant through the pas- the casing I4.
10 sages thereof.
In evaporators of the flooded type it is desir- 10
Another object of my invention is to provide an able to provide some arrangement for producing
improved evaporator of the flooded type for re- a rapid circulation of liquid refrigerant and a
frigerating machines which shall provide a posi- recirculation of liquid refrigerant from the header
tive and eñicient circulation of liquid refrigerant through the refrigerant circulating passages. An
15 with a minimum of turbulence within the header. , increased rate of circulation of liquid refrigerant 15
Further objects and advantages of my inven- increases the rate of absorption of heat and, con
tion will become apparent as the following de- sequently, provides an evaporator which will cool
scription proceeds, and the features of novelty the surrounding air more lrapidly and will also
which characterize my invention will be point- provide for rapid freezing of water, desserts and
zo ed out with partioularity in the ciaims annexed to the like. I attain these advantages by construct- 20
and forming a part of this specification.
ing the evaporator of two sheets of metal having
For a better understanding of my invention, indentations formed therein to provide a header
reference may be had to the accompanying draw- and a plurality of depending U-shaped refrig
ing in which Fig. 1 shows a household refrigerator
25 utilizing an evaporator embodying my invention;
Fig. 2 is an enlarged perspective view of the
evaporator shown in Fig. 1; and Fig. 3 is a plan
view of the sheet metal portions of the evaporator
shown in Fig. 1 prior to bending.
so
Referring now to the drawing, in Fig. 1 I have
shown a household refrigerator comprising a
erant circulating passages or conduits and an ar--
rangement whereby the refrigerant supplied to 25
the evaporator is utilized to produce a positive
circulation of liquid refrigerant to the header and
a recirculation from the header in a predeter
mined direction. Portions of the U-shaped re
frigerant passages are preferably arranged in 3o
a horizontal plane to provide a surface for Sup- '
cabinet iu having a food compartment Il and a
door I2 for closing the compartment. The compartment II is cooled by an evaporator or cooling
35 unit I3 arranged in the upper portion thereof and
supplied with refrigerant from a refrigerating
machine mounted on the top of the cabinet. The
porting freezing trays which afford rapid freez
ing 0f Water, desserts and the like.
Referring 110W t0 Fig. 2, the evaporator I3 iS
made of inner and outer sheet metal portions 22 35
and 23 respectively. The Sheets 22 and 23 are
made of stainless steel or other suitable material
refrigerating machine comprises a closed casing I4 in which is arranged a motor and a re40 frigerant compressor, an air cooled refrigerant
condenser I5 comprising a conduit I6 and a float
valve chamber I'I. During the operation of the
motor and compressor within the casing I I
and are provided With indentatìOnS 01’ Corruga
tions forming the cylindrical header 20 adjacent
the upper endS 0f the Sheets, a plurality 0f 40
gaseous refrigerant is compressed and discharged
45 into the conduit I6 of the condenser I5 where
it is cooled by air circulating over the condenser
due to the natural drafts, and is liquefied. The
liquefied refrigerant then ñows through a connection I8 to the float valve chamber I'I. When
50 a. predetermined amount of liquid refrigerant has
collected in the chamber I1 a float arranged
therein rises and admits refrigerant to the evaporator I3 through a conduit I9. The liquid refrigerant is vaporized by the absorption of heat
55 from the chamber II , and the vapor collects in
separate U-shaped depending conduits 25, a
sinuous conduit 26, a mallìfOld 2l and a plurality
of ducts 28 connected to the manifold 2l and the
lower portions of the U-shaped passages 25. The
upper ends of the U-shaped passages all com- 45
municate with the lower portions of the header
20 and are all arranged Substantially in 10I1gi
tudinal allnement. The sheets 22 and 23 are
bent to form side walls 29 and 30 and top and
bottom Walls 3l and 32 respectively, providing 50
upper and lower surfaces Bla and 32a for sup
porting freezing trays and the like. Depending
U-shaped refrigerant circulating passages 25 ex
tend downwardly from the header 20 within the
side wall 29 and across the bottom wall 32, and 55
2
2,117,ee1
the sinuous conduit 26 extends in part across the
top wall 3| and in part within the side wall 30.
The sheets 22 and 23 are secured together-
around their edges and between the indentations
by welding, brazing or any other _suitable man
ner; the front and rear edges of the sheet 22
being folded over the respective edges of the sheet
23 in the manner indicated at 24. A flange _33
formed on the sheet 22 at the end thereof remote
10 from the header 20 fits against the side wall 29
and is welded or otherwise »secured thereto. A
metal sheet 34 is welded to the upper end of the
side wall 30 and constitutes a side wall for an
upper freezing chamber.
The wall 29 and the
15 wall 3l are provided with flanges 35 and 36 re
spectively, for securing the evaporator to a re
movable top wall of a refrigerator cabinet. The
,general arrangement of the header and the
passages within the wall of the evaporator is not
20 my invention but is the invention of Leonard W.
Atchison, and is disclosed and claimed in his co
pending application, Serial No. 51,846, ñled
November 27, 1935, and assigned to General Elec
tric Company, the assignee of my present inven
25 tion, I do not, therefore, herein claim any in
vention claimed in the said Atchison application.
Referring now to Figs. 2 and 3, liquid refrig
erant is admitted to the evaporator I3 through
the conduit I9 and enters a passage 31 formed
30 in the side wall 29 and the bottom wall 32. 'I‘he
passage 31 communicates directly with the sinu
ous passage 26 and the refrigerant therefore
flows into the sinuous passage, circulates there
through and ñows to the manifold 21.
35
The ducts 28 which convey the refrigerant
uniformly from the manifold 21 to the several
U-shaped passages 25 are arranged .in such
manner as to induce a positive circulation of
40
45
50
55
liquid refrigerant in a predetermined direction
through each of the U-shaped passages. In
order to accomplish this mode of circulation each
of the ducts 28 is arranged to inject refrigerant
directly and longitudinally into one leg of a
U-shaped passage, to produce a flow through
that leg of the passage and upwardly to the
header 20. 'I'he resultant injector action pro
duces a positive flow of liquid refrigerant through
each of the U-shaped passages, liquid refriger
ant recirculating from the header downwardly
through the other leg of the passage; a rapid
circulation and recirculation in all U-shaped
passages is thereby provided. In order to mini
mize the turbulence of the liquid refrigerant
within the header 20 which results from the
rapid circulation of refrigerant, I arrange the
injectors 28 so that the same direction of flow
of liquid refrigerant obtains in adjacent legs of
adjacent U-shaped conduits. It is evident that
when the refrigerant is thus caused to circulate
60 in the same direction in the pairs of adjacent
legs of the U-shaped passages, there will be a
less frequent reversal of the direction of flow
of refrigerant along the header. If the direc
tion of flow were made thev same in al1 the
65 U-shaped passages, each passage would have re
frigerant flowing therein in a direction opposite
the direction of flow in the adjacent passage
and there would be increased turbulence and
consequently increased resistance to the circu
70 lation of liquid refrigerant.- In the evaporator,
as described above, there will be larger areas of
upward and downward flow, since each, area will
correspond to the portion of the header above
two of the legs of the U-shaped passages.
Dun'ng the operation of the evaporator de
»
-
scribed above, refrigerant is admitted to the pas
sage 31 from the passage I9 and ñows from the '
passage 31 through the sinuous conduit 26 and
thence to the manifold 21. Some of the refrig
erant flowing through the conduit 26 is -vapor
ized by the absorption of heat from the air With
in the chamber Il and from articles placed on `
the freezing shelf 31a; The vaporized and liquid
refrigerant flows fromf the manifold 21 in sub
stantially equal amounts through the ducts 23
and into the several U-shaped passages 25.
Since each of the ducts 28 directs refrigerant
upwardly into only one leg of the U-shaped
passage with which it communicates, the direc
tion of flow of refrigerant in each U-shaped 15
passage is definitely predetermined and minimum
turbulence of liquid ~refrigerant in the header
is assured at all times. Liquid refrigerant vapor
ized within the passages 25 by the absorption
of heat from articles resting on the shelf 32a
and from the air within the chamber Il, collects
in the header and is withdrawn therefrom
through suction conduit 2l.
It will be apparent from the foregoing that
I have provided a flooded evaporator of simple 25
construction having an improved arrangement
for predetermining the direction of ñow of re
frigerant in the circulating passages thereof and
for assuring a minimum of turbulence and,
therefore, a minimum resistance to circulation 30
of the liquid refrigerant.
While I have described my invention in con
nection with a household refrigerator, other ap
plications will readily be apparent to those skilled
in the art. Ido not, therefore, desire my in 35
vention to be limited to the particular construc
tion shown and described, and I intend in the
appended _claims to cover all modifications with
in the spirit and scope of my invention.
What I claim as new and desire to secure 40
by Letters Patent of the United States is:
1. A flooded evaporator for refrigerating ma
chines comprising a header and a plurality of
separate depending U-shaped refrigerant circu
lating passages, both of the ends of each of 45
said passages communicating with said header
and all of the ends of said passages being sub
stantially in longitudinal alinement along said
header, means including a plurality of ducts one
communicating with the lower portion of each
of said U-shaped passages and injecting liquid 50
refrigerant longitudinally into said U-shaped
passages for producing a circulation of liquid
refrigerant toward said header in one leg of
each of said passages and away from said header
in the other leg of each of said passages and
for determining the direction of circulation of
liquid refrigerant in each of said passages, and
means for withdrawing gaseous refrigerant from
said header.
60
2. A flooded evaporator for refrigerating ma
chines comprising a header and a plurality of
separate depending U-shaped refrigerant circu
lating passages, both of the ends of each of said
U-shaped passages communicating with said 65
header and all of the ends of said U-shaped pas
sages being substantially in longitudinal aline
ment along said header, means including a plu
rality of ducts of relatively small cross-sectional
area as compared with the cross-sectional area 70
of said passages and injecting liquid refrigerant
longitudinally into one leg of each of said pas
sages for producing a circulation of liquid re
frigerant toward said header through said one
leg and away from said header in the other of 75
2,117,861
3
said legs, and means for withdrawing gaseous
refrigerant from said header.
3. A flooded evaporator for refrigerating ma
lation of liquid refrigerant toward said header
chines comprising a header and a plurality of
tion of circulation of liquid refrigerant in each
of said passages, said circulation producing
means being arranged to circulate the liquid
refrigerant in the same direction in adjacent
separate depending U-shaped refrigerant circu
lating passages, both of the ends of each of said
passages communicating with said header and
all of the ends of said passages being substan
tially in longitudinal alinement along said
header, means communicating with the lower
portion of each of said U-shaped passages and
injecting liquid refrigerant longitudinally into
said U-shaped passages for producing a circu
in one of the legs of each of said passages and
away from said header in the other leg of each
of said passages and for determining the direc
legs of adjacent ones of said U-shaped passages,
and means for withdrawing gaseous refrigerant 10
from said header.
CHRIS'I'IAN S'I'EENS'I'RUP.
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