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Патент USA US2134542

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0d. 25, ‘1938. ,
2,134,542
C. F. ALSING
FLOW RESTRICTOR
Filed Aug. v31, 1955
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WITNESSES: '
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INVENTOR
‘
CARL. E ALSLNG.
MW
ATTORN
2,134,542
Patented Oct. 25, 1938
UNITED STATES PATENT- OFFICE
2,134,542
FLOW RE STRICTOR
Carl F. Alsing, Spring?eld, Mass, assignor to
Westinghouse Electric & Manufacturing Conn
pany, East Pittsburgh, Pa., a corporation of
Pennsylvania
Application August 31, 1936, Serial No. 98,754
3 Claims. (Cl. 62—1)
My invention relates to a- ?ow restrictor for
restricting the ?ow of ?uid from a high to a low
pressure region, and particularly to a ?ow re
strictor for restricting and lowering the pres
i sure ‘of liquid refrigerant passing from the con
denser to the evaporator of a refrigerating sys
tem.
It is an object of my invention to provide an
improved flow restrictor of the capillary passage
0 type in which clogging of the passage by lint and
dirt is practically eliminated.
,
It is another object of my invention to provide
an improved ?ow restrictor of the capillary tube
type for use in a refrigerating system in which
iii refrigerant and lubricant are in contact with the
windings of the motor driving the compressor.
These and other objects are effected by my in
Such devices are referred to by some in the re
frigerator art as capillary tubes. One end 26
of the tube 24 extends into the evaporator 2|,
and the inlet end 21 of the tube extends into a
?tting 28 having a chamber 29 into which liquid 5
refrigerant from the condenser i6 is conveyed
through the conduit Hi.
In refrigerating systems employing capillary
tube type ?ow restricting devices, the inlet end
of the small passageway in the tube may clog
because small shreds of lint from the insulation
on the motor, pieces of dirt and the like catch
on the sharp edges of the tube, crosswise of the
opening of the passage 25. After a few such par
ticles adhere to the inlet of the tube, other par- 35
ticles add rapidly to those already caught and
eventually bridge and clog the passage, necessi
vention-as will be apparent from the following tating opening the system to clean the tube, which
description and claims taken in connection with is obviously very expensive and troublesome.
In order to obviate these difllculties, I have 20
20 the accompanying drawing and forming apart
rounded
the inlet edge of the tube 245, as shown
of this application, in which:
Fig. i is a diagrammatic view of 'a compressor at 35. I have, furthermore, tapered the outer
refrigerating system embodying my invention; surface of the tube at the inlet end as shown at
32. By so forming the capillary tube 2t, shreds
and,
25
Fig. 2 is an enlarged view of the inlet end of of lint, dirt and the like, when they contact the
the flow restrictor shown in Fig. 1 as a capillary rounded edge and tapered sides 32, slide ed the
edge and either pass through the passage 25
tube.
lengthwise, as shown at 33, or pass to the out
Referring to the drawing for a detailed descrip
tion of my invention, numeral l l designates a side of the tube 2d along the tapered sides 32.
Furthermore, by rounding the edge of the tube
sealed casing containing a motor l2 and a re
frigerant compressor i3. Refrigerant is drawn 24, its flow characteristics are improved because
turbulence at the inlet thereof is reduced.
' from the interior of the casing H through a com
From the foregoing it will be apparent that I
pressor inlet ill and compressed refrigerant is
have provided an improved ?ow-restricting de
forced through an outlet conduit IE to a con
vice which will not clog up with lint and dirt, and 35
35 denser lt wherein it is condensed by the air driv
en over the condenser by a fan IT.
Liquid re
frigerant is conveyed from the condenser l6
through a conduit i8 to a flow restricting and
pressure reducing device generally indicated at
Refrigerant is admitted through
40 l9 (Fig. 1).
the flow restricting device M to an evaporator
2|, wherein liquid refrigerant at low pressure va
porizes and absorbs heat. Refrigerant vapor is
withdrawn from the evaporator 2| through a con
duit 22 by the action of the compressor l3 and
enters the interior of the sealed casing H, where
it comesin contact with windings 23 of the mo
tor l2. The motor windings are usually insu
lated with cloth or paper and shreds of the in
sulation may be present in the refrigerant.
The flow restricting device l9 preferably com
prises a helically coiled tube 24 of considerable
length and having a passage 25 therein of rela
tively small bore so as to restrict the ?ow of
liquid from the condenser to the evaporator 2!.
which is designed for use with a hermetically
sealed motor-compressor unit wherein the refrig
erant is in contact with the insulated windings
of the motor. ‘
While I have shown my invention in but one 40
form, it will be obvious to those skilled in the
art that it is not so limited, but is susceptible
of various changes and modi?cations without de_
parting from the spirit thereof, and I desire,
therefore, that only such limitations shall be
placed thereupon as are imposed by the prior
art or as are specifically set forth in the appended
claims.
What I claim is:
.
v
1. In a refrigerating system, the combination 50
of a condenser and an evaporator in which re
frigerant is successively condensed and evaporat
ed, said condenser forming a part of the high
pressure region of the system, and a device for
restricting the ?ow of refrigerant between the M
2
9, 184,542
‘
condenser and the evaporator, said device com
end of the tube extending into the portion
prising a tube having a restricted flow passage inlet
of the relatively larger flow area.
therein, the inner edge of the tube at the inlet
3. In a refrigerating system, the combination
end having inwardly converging walls, forming
WI an entrance to said passage, and the material _of an evaporator and a condenser in which re-'
frigerant is successively evaporated and conbetween the wall of the passage and the outer
densed, said condenser formin a portion of the
wall of the tube at the inlet end being rounded, high
pressure region of the refrigerating system,
whereby a smooth surface is provided at the inlet a motor
and a compressor for circulating refrig
end, said high pressure region of the refrigerat
erant to the evaporator and condenser, a sealed
10 ing system having a portion of larger flow area
casing for enclosing the motor and compressor 2
than 'said tube, said inlet end of the tube ex
and containing some of said refrigerant in con
tending into said portion of larger‘?ow area.
2. A capillary tube for a refrigerator system,
‘which system includes an evaporator and a con
‘ denser in which refrigerant is successively evap
orated and condensed, said condenser forming
a portion of a high pressure region of the re
frigerating system, said capillary tube having a
relatively restricted bore of uniform diameter
for controlling the ?ow of liquid refrigerant from
the condenser to the evaporator, the walls of the
bore being curved outwardly adjacent the ex
‘ tremity of the tube, said curved walls meeting
at a point adjacent the entrance of the tube,
whereby a smooth surface is provided at said
inlet end, said high pressure region of’ the re
frigerating system having a portion of larger
cross sectional area than the area de?ned by
the outer circumference of said tube, and said
tact with both the motor‘ and compressor, and
means including a capillary tube having a rela
tively restricted bore of uniform diameter for
controlling the ?ow of liquid refrigerant from
the condenser to the evaporator, the walls of the
bore being curved outwardly adjacent the ex
tremity of the tube, and the outer walls of the
tube being curved inwardly adjacent the extrem
ity of the tube, said curved walls meeting at a
point adjacent the entrance of the tube, whereby
a smooth surface is provided at said inlet end,
said high pressure region of the refrigerating
system having a portion of larger cross sectional
area than the area defined by the outer circum
ference of said tube, and said inlet end of the
tube extending into the portion of the relatively
larger flow area.
CARL F. AISING.
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