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Патент USA US2133875

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' Oct.f 1s, 1938.
c. H.s'rE-Elusj-R'UP4
2,133,875
REFRIGERATING MACHINE
Fi1_ed Feb. 17, 1957
l"
94 .
`
" :
96
vh‘u/evfcov‘: y
Cen-'l H. Steenstr‘up,
'
by )Vm/'yé'
His f ‘Attorney .
Patented Oct. 18, 1938 `
A 2,133,875
« UNITED STATES
~
2,133,875
Y
REFmcEnATmG MAcnnvE
Carl H. Steenstrup, Schenectady, N. Y., assignor
toGeneral Electric Company, a corporation oi' „
‘ New York
Application February 17, 1937, Serial No. 126,206
5 Claims. (Cl. 2311-232)
My invention relates'to compression type re
l frigerating machines, and >incre particularly to
an improved construction and arrangement of
n
an intake muilier therefor.
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Compression type refrigerating machines are
frequently provided with a compressor and a driv
ing motor enclosed in a casing which'is prefer
ably hermetically sealed, thus obviating the ne
cessity of using connections with packing glands
10 or the like between the motor land compressor,
gaining entrance intovthe intake muiller 'and the '
cylinder ofthe compressor. '
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Another object of my invention is- to provide
‘ an improved intake muiiier construction for com-'
pression type `ïefrigerating machines which em- 5
bodies an arrangement providing for the escape
from the intake muiiler of any lubricant accumu
lated therein.
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Further «objects and advantages of my inven
tion will \become apparent as the following de- 10
and minimizing leakage of refrigerant from the. scription proceeds, and the features of novelty »
machine, as any gaseous refrigerant which es
which characterize my invention will be pointed _ '
capes from the compressor is confined in the out with particularity in theclaims annexed to
enclosing casing. It is desirable that the‘enclos
and forming a part of this speciflcation.`
_
15
ing casing be provided with a lubricant reservoir For a better understanding of my invention m
for containing a body of lubricant which is re
reference may be .had to the accompanying draw- . »
circulated to the bearings and moving parts of ing, in which Fig. 1 is a side elevation, partly in~
the motor and compressor during operation of section, of a refrigerating machine embodying
the machine without the necessity of variation
20 and replenishment, thus simplifying the main
tenance of the machine. In order to minimize
the transmission of operating noises of the com
my invention; Fig. 2 is a vertical sectional view ,
or tne'mtake mumer shown in Fig. 1; F1g:3 is a 2° sectional view of the intakemuiiler alongthe line ' '
3,-3 of Fig. 2; Fig. 4 is a vertical sectional view "
pressor through the enclosing casing to a refrig
of a modified form of the intake muffler4 shown in .
erator cabinet it is desirable 'that an, intake muf
Fig. _2; Fig. 5 is a plan view óf the intake muilier
25 fier be associated with the -intake port of the . shown in Fig. 4; and Fig.'6 is a fragmentary side 25.
elevational view taken in the direction of the'
During the operation of a- refrigerating ma
arrow 6 in Fig. 1 of the refrigerating machine.
chine of this type it is very important that no
Referring to the drawing,A in Fig'. 1 I have.
appreciable quantity of Íthe body of lubricant shown a refrigerating machine ofthe household
30 contained in the> lubricant reservoir formed in type provided with a. hermetica'lly rsealed casing
the enclosing casing be dr'awn into the cylinder I0 made of an upper casing section II and a
of the compressor through the intake muiller, asV lower casing section vI2, the adjacent edges of
the presence of lubricant >in the compressor cyl .these casing sections being welded together at
inder would give rise to excessive pressures in I3 over-a reinforcing ring I4. `The casing sec- o.
B5 the cylinder resulting in damage to the valves tions II and I2 are preferably made of steel and 35
of the compressorylubricant being a non-com
-are mounted on a removable cabinet _top I 5. 'A" ,
pressible fluid. In actual practice, it is diil‘icult to refrigerant compressor I6 and an electric driving
prevent lubricant from being drawn into the cyl-- motor I1 therefor are enclosed within `the her- -'
inder of the -compressor as the body of lubricant' metically sealed casing Iß. v 'I'he compi-'essorv I6
i0 contained in the lubricant reservoir formed in is secured to the top of the driving -motorv I'I by'40 „
compressor.
.
,
the enclosing casing often becomes `frothy'and
a series of bolts I8, thus formingacompact uni
»
rises considerably above its `normal operating
tary structure. This unitary structure is mount- _ n y
level in the enclosing casing into the intake zone
edin the casing I 0 onthree vertical springs I9,"V
of the intake muilier. Furthermore, >during- the
i5 assembly >and shipment of -such a refrigerating
machine the enclosing casing oftenlbecomes tilt
ed from its normally upright. position allowing a
portion of the body of lubricant contained .in the
20 and 2|. 'The upper'ends of the springs I9, .20
and 2| are` secured to feetv22, 23 and 2l, respec- 45
tively, these feet being welded to the periphery
of the frame ofy the motor I'I- _at equally spaced
intervals'. A lubricant reservoir I2a _is formed in ` 1 '
lubricant-reservoir to spill into the intake muilier, -the lower casing section v12 and >contain'zfiïa body
i0 from which it is drawn into the cylinder of the of lubricant therein which is recirculated from 50
compressor when the machine is started. -»
the lubricant reservoir tó the bearings and mov
It is -an object ofmy invention to provide an ~ ing parts of the motor and the compressor-dur
improvedarrangement of the intake muiiler in ing operation ‘of the machine. _ .v-Also gaseous re
an enclosed compression type refrlg rating ma- `< _ frigerant
i5 chine in order to prevent frothy lu riçant from
is conñned in the upper portion of-_th‘e
enclosing casing Il.
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2
2,188,875
lAs best shown in Fig. 6, the driving motor I1
retracted on lits suction stroke the pressure with- '
has _a substantially vertically disposed shaft 25 i in the cylinder is reduced and gaseous refrigerant
which extends above the upper end shield of the is drawn into the cylinder from .the upper portion
driving motoí- and reciprocates a compressor pis
of the enclosing casing I 0 through the intake
t0n 23 in a substantially horizontal cylinder of i muiller 33, the muille box 3| and the intake valve
the compressor i3 through a suitable driving of the cylinder. ~When the piston 23 in the com
>connection 21. Preferably,.the driving connec - pressor cylinder is moved in the opposite direc
tion on its ‘compression stroke the gaseous refrig
tion is of the Scotch yoke mechanism type in
erant within the cylinder is compressed and dis
cluding a crank‘pin 28 and a cross-head 23 slid
10 'ably carried by the end of the piston 23. A coun
charged through the exhaust valve of the cylinder
terweight 30 is disposed eccentric with respect and the muille box 3| into the exhaust muiller 35.
en.
'I'he compressed gaseous refrigerant passes from
the exhaust mutller 35 through a conduit 33 _to a
condenser 40 which is cooled by natural draft and
which surrounds the enclosing casing I0, the con
denser having a passage 4|. therein, preferably
divided into upper and lower portions which are
to the center line of the vertical shaft 25 and
counteracts the dynamic unbalancing affect of
the crank-pin 23 and the reciprocating piston 23
upon the. u'nitary structure comprising the com
pressor I3 and the driving motor _|1, during op
eration of the machine. .Intake and exhaust
vports are provided in the compressor cylinder in
connected in series by a conduit 42.
The com
pressed gaseous refrigerant is liquefied in the con-4
denser 4|)A and flows therefrom through a conduit 20
43 to a suitable ñow controlling ñoat valve 44.
Liquid refrigerant is supplied from the flow con
trolling fioat val‘ve 44 through a liquid line 45 to
a sheet -metal flooded type evaporator 43.v 'I'he
evaporator 43V is supported in the food storage
compartment of the refrigerator cabinet by the
_heat insulated removable cabinet ,top l5. The
liquid refrigerant contained in the evaporator 43
communication with a muflle box 3| secured to
20 the compressor I3 adjacent the outer end of the
horizontal cylinder by a series of bolts 32. A
cylindrical intake muffler 33 is secured to the
lower end of a depending intake conduit 34. the
upper end of which is secured to the muille box ‘
25 3| in communication with the intake. port of the
cylinder of the compressor I3. A cylindrical ex
haust muiller 35 is secured to the lower end of a
depending exhaust conduit 33. the upper end of
is vaporized by the absorption o_f heat from arti
which is secured to the muille box 3| in com
30 munication with the exhaust port of the cylinder
of the compressor I3. A plurality of relatively
long restricted tubes 31 havine` return-bend por
» tions secured in openings provided inthe intake
cles contained in the-food storage compartment
in which‘the evaporator is located and the vapor
ized refrigerant is collected in a cylindrical header
muffler 33 provides communication between the .
41' which _is normally maintained about half full
of liquid refrigerant. The vaporized refrigerant
upper portion of the enclosing casing I3 and the ` which is accumulated above the level of the liquid 35
refrigerant in the header 41 is returned to the in
interior of the intake muiller 33.
-'
When the refrieerating machine is first started terior of the enclosing casing l0 throughv a suc- l
the bndv of lubricant contained in. the lubricant - ~tion conduit 48 which communicates with the
reservoir I 2a formed in the enclosing casing I0 'header 41 above the normal liquid level therein.
becomes frothy and rises above its normal level inl ` It will be noted that the discharge end 48a of the
the enclosing casing due to the reduction of the
pressure within the enclosing casing. causing the'
gaseous refrigerant absorbed in the body of lubri
suction conduit 48 is located above the normal
level of the body of lubricant contained in the
cant to separate therefrom. Even though .the
bodv of .lubricant contained in the lubricant res
ing section- I2 of the enclosingicasing I0. The
vaporized gaseous refrigerant thus discharged in 45
lubricant reservoir |2a formed in the lower cas- ~
the enclosing; casing I3 is again drawn into the ervoir |2a becomes frothy and rises in the enclos
ing casing II! when the machine is started or any intake muii'ier 33 through the tubes 31 communi
time during the- operation of the machine‘, it can-` cating with the zone substantially free of frothy
not completely ñll the enclosing casing as it will y lubricant in the upper portion of the enclosing
be broken up when its upper> level reaches the casingrlil, and the cycle above described is re -50
horizontal plane of movement of the eccentrically peated until the compartment in which the. evap
disposed counterweight 30, indicated b_y the‘
broken line 38 in the ùpper portion of the enclos
ing casing. 'I'he frothy lubricant coming into
55 contact with the counterweight 33 is thrown out
wardly in a radial direction in a thin sheet sub
stantially in the plane' indicated by the broken
line 38 due to centrifugal force, which further
prevents the frothy lubricant in the lower portion
60 of the enclosing casing I3 from rising above this
plane. The movement of the counterwei'ght 30
. orator 43 is located is cooled to the desired tem- ._
perature. It will be noted that the upper portion
of the enclosing'casing I3, above the level of the
body of lubricant in the lubricant reservoir |2a 55
L therein, is normally filled with low pressure gase
ous refrigerant. Any gaseous refrigerant which
may have been trapped in the body of lubricant
while the machine is at rest will be released from
this body of lubricant after the machine has run 60
^ a short time and will _again be mingled with the
in the plane substantially normal Ytothe vertical
shaft 25 thus suppresses frothing of the lubricant
in the upper portion of the enclosing casing and
low pressuregaseous refrigerant thereabove.
establishes a zone substantially free of frothy
and 3, and comprises a series of similar casing
lubricant in the upper portion of the enclosing
casing above the plane indicated by the broken
line 33. The inlet ends of the tubes 31 communi
form of the intake-muffler only an upper casing
section 33 and a similar lower casing 3| are shown
cate with this zone in the upper portion of the
70 enclosing casing II! above the >plane indicated by
the broken line 38, thereby positively insuring that
no frothy lubricant will be drawn into the intake
mumer 33 along with the gaseous'refrigerant dur
ing the operation of the machine.
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As'the piston 23 in the compressor.. cylinderis
Preferably, the intake munler 33 is formed of
sheet metal, one formvof which is shown in Figs. 2 '
sections secured together. -In the illustratedl
in series, although it will be understood that any
desired'number of casing sections may be em 70
ployed kin'seri‘es to obtain the muiliing affect de- '
sired. Each of the casing sections is of cup
shaped configuration comprising an end wall, a
cylindrical side wall and an outwardly flared
open end. The outwardlyñaredeopen‘ eñd 32 of 75
2,183,875
1
the upper casing section 88 receives the end wall then flows from-the lower- chamber 66 through
i 63 and ñrmly grips the cylindrical side wall of the >the restricted passage 64 formed in the end wall
lower casing section 6|. The_upper and lower 63 of the lower-casing section 6| into the upper
casingsection may be soldered or otherwise rig chamber 66 of the muiller casing. 'I‘he gaseous
idly secured together. However, I prefer that the refrigerant is then drawn from> the upper
ñt between the outwardly flared open end of the _chamber 65 through the depending intake con
upper casing section and the cylindrical side wall duit 34 into the muiile box 3| and the intake of
of the lower casing section' be sufficiently tight `to r» the compressor I6. Any lubricant gaining en
hold the munler casing in assembled relation by trance into-‘the muiiler casing 33 will escape
10 friction. The end wall 63l of the lower casing 6|
through Ythe restrl ted aperture 14 provided in l0
constitutes a transverse partition in the mumer the plate 61 and Vdrained back into the lubri
' casing and is provided witha restricted passage
_64 therein affording communication between up
per and lower chambers 65 and 66, respectively,
15 in the muiiier casing.’ A plate 61 is rigidly se
cured in _the outwardly flared open end 68 of the
lower casing section 6I by _brazing- or the-like.
Thefend of the return-’bend portion of each o‘f the
tubes 31 is secured by brazing in openings 63 pro
vided in the plate 61.
e lower end of the de
pending intake conduit 341 secured by brazing in
cant reservoir |2a.
.
_
In an intake mumer vsuch as I have illustrated
in Figs. 2 and 3, designed for use in conjunction
with a sulphur dioxide refrigerant compressor, 15
d two tubes 31 should be employed to conduct
_ gaseous refrigerant into the muiller casing 33.
Each of the tubes should have a return-,bend por
tion and an overall length approximately 50
times the internal diameter thereof so that an 20
extended reverse-flow muiiling path of restricted
a restricted passage 10 'formed in the end 'wall 1|
cross-section is formed between the inlet and
of the upper casing section 60. The intake con
òutlet'ends of the tube. The columns of gaseous
duit 34 has an external diameter such that it ` refrigerant in these tubes have a sufliciently high
may be. snugly received in either of the restricted inertia that the energy of the wave motion set up 25
passages 10 or 64 in the upper or lower casing' in the gaseous refrigerant within the depending
^ _ section 60 or 6I, respectively, so that when che
intake conduit 34 and the chambers 65 and 66
'intake'mufiler is assembled any _of a large number in the muiiler casing is substantially all dissipated
of similarly formed casini lsections may be placed in moving such columns of gaseous refrigerant.
in any order'in the series. Preferably, each of The volume of the muliierchambers 65Vand 66 30
the tubes 31 is provided with an inlet end or open
should be relatively‘large as compared to that.
ing 12 disposed at a relatively sharp angle with of- the tubes 31, both the internal diameter ‘and
" »- respect to the axis of the extended portion of
the héightof each of the chambers being of the
the tube invorder to minimize the whistling noises _. order of 9 times the internal diameter of the
produced by the entrance of the gaseous refriger
tubes 31. Also, the' volume of the muffler casing
ant into the tube. Also, the endof the return
should be somewhat larger than the volumetric
bend portion of each Vof the tubes 31 received in displacement of the piston in the cylinder of
the opening 63 formed in the plate 61 is provided the compressor in order to provide a reserve sup
with an outlet end ory opening 13. disposed ata ply> of .gaseous refrigerant in the munier casing
relatively sharp angle with respect to the axis of ' thereby lminimizing the surges _of gaseous re»
40
the return-bend portion of the tube >in order toV frigerantw into the compressor on the 4suction
further minimize the whistling noises produced 'stroke and the accompanying vibratory ' dis
by the gaseous refrigerant emerging from the
tube-into the lower chamber 66 in the muiiier
casing.
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_
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A restricted aperture 14 is provided _in the
plate 61 which añords communication between
turbances.
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_
In Figs. 4 and 5 I have shown a modified form
of the intake muffler 33 comprising comple
mentary upper and lower casing sections 80 and
8|, respectively, _of substantially cup-shaped con
the lower chamber- 66 lin the muilier casing and ' ñguration. The upper casing section 80 is pro
the interiorof the enclosing casing lilto provide
' vided with an outwardly‘flared open end-82 and
for the escape from the lower chamber 66 of any, _' the lower casing section 8|v is provided with an
lubricant accumulating therein, and to allow this inwardly flared open end 83, the inwardly flared 50
e lubricant to be drained back into thelubricant open end -83 being received and ñrmly gripped
reservoirA I2a formed in the lower casing section within the outwardly flared open end 82. vThese
ȏ I2. The area of the restricted aperture 14 is casing sections may be brazed or otherwise _rigid
55
small asïcompared to theareaof the tubes’31'in -ly secured together. However, I prefer that the
order to insure that- the pressure drop through
`the restricted aperture 14 is relatively great as.
compared to the pressure drop through the tubes
3l. This arrangement insures that substantially
no gaseous refrigerant will be> drawn into the
lower chamber 66 of the mui'iler casing-„through
‘the restrictive aperture .14, yet lubricant ac
cumulating therein will be permitted to escape.
The arrangement and construction of the
iit between the outwardly flared` op'en end’82 and
the inwardly flared open end 83 be suiilciently
sa
tight to hold the muiller casing in assembled re--_
‘lation by -friction. A transverse partition. 84 is
arranged in the upper casing section’80 in abut 00
ting relationship with the inwardly flared open
end 83 of the lower casing section 8i. The par
tition 84 is provided with a restricted passage 85
therein forming communicating upper and lower
chambers 86 and_81 in the muiller casing. The
- intake muffler as above described is described
>and claimed in my copending application, Serial ‘ end wall 88 of the upper casing section 88 is pro
No. 161,075, ñled August 26, 1937, which is a vided with twg spaced apart openings 83 in I
division of the present case.
vertical alignment with two spaced apart open- `
Í During the operation of the refrigerating ma-A ings 90 providedy in the transverse .partition 84
chine gaseous refrigerant is drawn into the lower through which two relatively long restricted
‘"jchamber 66 of the `intake mufller 33 from the tubes 3| are inserted in‘to the muffler casing.' 70
zone'substantially free of frothy lubricant in the Each of the tubes 9| extends through the endv
_ upper portion of the enclosing casing I8 -through wall 88 _of the upper casing section 88, the upper
' the relatively long restricted tubes 31 having chamber 86, and the transverse partition 84,_into
return-bend portions. The gaseous refrigerant the lower chamber 81. 'The tubesßI/are of suf
l
4..
2,138,875
iicient length so as to communicate _with the.
serves as a baille for the gaseous refrigerant
zone substantially free of frothy lubricant in the
upper portion of the enclosing casing Ill, when
the intake muilier illustrated in Figs.v 4 and 5
is employed in the refrigerating machine. Pref
emerging from the tubes to reverse the direction
of flow thereof. The columns of gaseous re
frigerant in these tubes have a sufficiently high
inertia that the energy of the wave motion set
up in the gaseous refrigerant within the depend
erably, each of thetubes 9\| is provided with an
inlet end or opening 92 disposed ata relatively . ing intake conduit 34 and the chambers 86 and
'y ' sharp angle with respect to the axis of the tube 81 in the mui‘iier casing is substantially all dissi
and an outlet end 93 disposed adjacent the end pated in moving- such columns of gaseous re
frigerant. The volume of the muiiler chambers
10 wall 94 of the lower casing section 8|. The
lower end of the depending intake conduit 34 86 and 81 should be relatively large as compared
is secured in an opening 95 provided in the end to that of the tubes 9|, the internal diameter of
each of the chambers being of the order of 9
wall 88 of the upper casing section 80. I
The end wall 94 of the lower casing section 8| times` the internal diameter of the tubes 9| and
the overall height of the two chambers being 15
is provided with a centrally disposed and in
wardly extending indentation 96 which defines approximately twice the diameter of the cham
an annular reservoir 91 in the end wall 94. A bers.- Also, the volume 'of the mui'iier casing
restricted aperture 98 is provided in the'inwardly should be somewhat larger than the volumetric
displacement of the piston in the cylinder of _the
extending indentation 96 which aiîo‘rds com
20 munication between the lower chamber 81 and 4compressor in, order to provide a‘reserve supply 20
of gaseous refrigerant in the muil'ier casing
the interior of the enclosing casing I8 to pro
vide -for the .escape from the lower chamber 81 thereby minimizing the surges of -gaseous refrig
`of any lubricant accumulated therein, and to erant into the compressor on the suction stroke
permit this lubricant to be drained back into and the accompanying vibratory disturbances.
the lubricant reservoir |2a formed in the lower
casing section I2. It will be observed that the
lower ends 93 of the tubes 9| are arranged out
- ‘ of alignment with the restricted aperture 98 pro
` vided in the inwardly extending indentation 96
V'to prevent >the gaseous refrigerant emerging
from’the outlet ends 93 of the tubes 9| from
interfering with the escape of lubricant accumu
lating in the annular reservoir 91 throughthe
restricted
aperture
98.
'I‘he
area l of 'the
restricted aperture 98 is small as compared to
_ the area'of the tubes 9| in order to insure that-
the pressure drop through the restricted Vaper
_ ture 98 is relatively great as compared to the
pressure drop through the tubes 9|. 'I'his ar'
rangement insures that substantially no gaseous
refrigerant will be drawn into the lower chamber
81 of the muiller casing through "the restricted
aperture 98, yet lubricant accumulating therein
will be permitted to escape.' `
' \,
During the operation -of the refrigerating ma
chine gaseous refrigerant is drawn into the lower-
While I have shown a particularl embodiment
of my invention in connection with a house
hold type of refrigerating machine, I do not de
sire my invention to be limited to the. particular
construction shown and described, and I intend
in the appended claims to cover all modiñcations 80
within the spirit and> scope of my invention.
What .I claim as newl and desire to secure
by Letters Patent of the United States is:
l. A refrigerating machine comprising a com
pressor, a motor for driving said compressor, an
enclosing casing for said compressor having a
lubricant reservoir in the lower portion thereof
containing a body of -lubricant and gaseous re
frigerant in the upper portion thereof, means
>for establishing a zone inthe upper. portion of 40
said enclosing casing substantially free of any
' frothy lubricant present' in said enclosing cas- 4 ‘
ing, an intake muiiler for said compressor, meansl
including an inlet opening arranged in said zone
for conducting gaseous refrigerant from said
zone to said muiller, 'and means for conducting
chamber 81 of the intake muiller from the zone
gaseous refrigerant from said muiller to said
substantially free >of frothy lubricant in the
compressor..-
-
upper portion of the enclosing casing I8 through
2. A refrigerating machine comprising a com-_
pressor, a motor for driving said compressor, an
.the relatively long restricted tubes 9|. The gase
ous refrigerant flows from the lower chamber 81 enclosing casing for'said compressor having a
through the restricted passage 85 formed in the lubricant reservoir in the lower portion thereof
`transverse partition 84 into the upper chamber containing a body of .lubricantvand gaseous re
86 of the muffler casing.` The gaseous refrigerant frigerant in the upper portion thereof, means
is then drawn from the upper'A chamber 88 operated by said motor for establishing a zone
through the depending intake conduit 34 into the in the upper portion of said enclosing casing sub
stantially free of any frothy lubricant present in
mufile box 3| and the compressor I6. Any lubri
cant gaining entrance into the muiilèr casing 8| said enclosing casing, an intake muiiier for -said
escapes through the 'restricted aperture 98 pro ~compressor, means including an inlet opening
vided in the inwardly extending indentation 86
arranged in said zone for conducting gaseous re
and 'is .drained back into the'lubrlcant reser
frigerant from said zone to said munier. `and
means for conducting gaseous refrigerant from’
voir
|2a.
l
In an intake
’
mumer sucnas :t have inustraœdï’
in Figs; 4 and 5, designed for use in conjunction
said muiiier to said compressor.
`
3. A‘refrigerating machine comprising a ver
with a sulphur -dioxide refrigerant compressor, - tical shaft motor, ajcompress'or having a cylin
' two tubes 9| should be employed to conduct gase
ous refrigerant into the muiiler casing. Each of
' the tubes should have an overall length approxi
mately 40 times the internal diameter thereof
.70 so that an extended muiiling path of restricted
cross-section is formed between the inlet and
-, outlet -ends of the tube. Also, the outlet ends of
the tubes should extend into the muilier casing
der .supported on top of said motor. an enclosing
casing for said motorand said compressor having '
a lubricant reservoir in the lower portion thereof e :
containing .a body of lubricant and gaseous refrigerant in the upper portion thereof, means in 70
cluding an eccentric counter-weight carried by
the upperportion of said shaft for counteracting
dynamic unbalance of said compressor and for
in close proximity to the end wall 94 of the establishing a zone in the upper portion of said
75. lower casing section 8| so that the end wall _ enclosing casing substantially free ofany frothy 75
_ver
V V l
1
5
251334,876
lubricant present in said enclosing casingf, an ì I l5'. `A refrigerating- machine comprising a com
intake _muilier for said comp?essor,_ means in
pressor; a-motor for driving said compressor, an
cluding a relatively long- restricted tube having
enclosing casing-forlsaid vcompressor and said
an inlet opening arranged in said zone for con
'motor havirigva.v lubricant reservoir formed inv
ducting gaseous refrigerant'fro'mv said zone to?l the lower portion .-thereof_containing a body of
said muiiler, and means including "a conduitfor' ~- '- lubricant and gaseous refrigerant in the upper
- conducting gaseous refrigerant from said mu?‘lerA portion thereof, '.meansoperated -by said motor
to said compressor cylinder.
`
z -:for establishingäa -zone in the upper portion of
4. A refrigerating machine.comprisingaxcom-l
said enclosing- casing substantially free of any
10 pressor, a motor for ,driving
c said compressor, >an >1 .frothylubricant‘ present> in said enclosing cas
enclosing casing for said compressor -havin'g‘j'av
' lubricant reservoir inv the lowerp'ortion"tlae?cof-
conta'imng a'body 0f lubricantì and. gáseous'ré;
`
frigerant in the upper- portionnthereof',.means
operated by said motor for establishing -a zone
l0
"ing,- an intake muiiier for said compressor ar- ' '
ranged in said enclosing lcasing», said muiiier hav- . ing a casing, means constituting a transverse
partition in.' said mumer casing and provided with
a'restricted passage -therein forming a plurality
in' the upper portion of said enclosing -casing„sub-_` ' cfl communicatingchambers in said muiiier cas
„ stantially free of any frothy lubricant> present in Qing, a relatively lon‘g restricted tube having an Y
7 said enclosing casing, an intake vmuiiier‘for saidv @inlet opening arranged» in said zone` for con
i compressor >arranged in said enclosing casing, " ducting gaseous refrigerant from said zone to
20 means including an inlet opening arrangedl in one of said chambers in said muilier; a restricted
said zone for conducting gaseous refrigerant ,from f aperture >in -said muiiler casing and arranged to 20
said zone to said muiiler, a- restricted-'aperture in" provide for the escape from said muffler casing
said muilier and arranged to provide for .the- ,' óf any lubricant accumulating therein, and a ,
25
escape from said muiiler of any lubricant acci'x-l f conduit for conducting gaseous refrigerant from
mulating therein, and means for* conducting gas'
another o'f- said chambers in said muiiler casing> 25
. eous refrigerar'rt from said mumer to saidlcòm- f to said compressor.
presser.
»
- J
‘
,
CARL H. STEENSTRUP.
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