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Патент USA US2096297

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Oct. 19; 1937.
H. GCLDN ER ET AL
REFRlA'GERATING MACHINE
Filed Dec. 16, 1956
2,096,297
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'Oct. 19, 1937;
H. GOLDNER |-_-r AL‘
2,096,297
REFRIGERATING MACHINE
Filed Dec. 16,‘ 1936
1'
2 Sheets-Sheet 2
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.
2,096,297
Patented Oct. 19, 1937
UNITED STATES PATENT OFFICE
REFRIGERATING MACHINE
Hans Giildner and Wilhelm Bock, Stuttgart,
Germany
Application December 16, 1936, Serial No. 116,225
In Germany December 20, 1935
6 Claims. (Cl. 62-115)
This invention relates to a compression refrig
machine becoming materially greater, a ribbed
erating machine, driven by an electric motor, for
cooling ring.
»
-
‘
pantry refrigerators, which is characterized by,
Furthermore the bottom of the pot-shaped
the provision of a pot-shaped evaporator, project
evaporator may be drawn inwards, and in the re
U! ing into the cooling chamber, with a closure cover. » cess thus formed a freezing pan may be lodged.
at. the top, upon which is mounted the driving
motor, together with the condenser or lique?er ar
The possibility is thus provided, in a simple man
ner and without taking up additional room, of
~ ranged around it, and on the under side of which . making ice when required.
are suspended the compressor and the regulator
Two embodiments of the invention are illus
10 of the refrigerating medium within the evapora
tor, an extension of the motor shaft, for the pur
pose of driving the compressor, passing through
trated by way of example in Figs. 1 and 2 and in 10
Figs. 3, 4 and 5 respectively of the accompanying.
the evaporator pot cover in a gas-tight manner.
There is hereby obtained a structure which is
15 cheap and simple to manufacture and which oc
Fig. 1 is a sectional elevation through the ?rst
embodiment of the refrigerating machine;
drawings, in which
,
.
.
Fig. 2 is a horizontal section on the line 2--2 in 15
cuDies very ‘little space. The pot-shaped evapora
tor may be produced seamlessly in a simple man
ner by drawing from sheet metal, and requires for
,Fig. 3 shows in central sectional elevation a~
pantry cooling cupboard adapted for the recep
tion of the refrigerating machine, with the refrig
the connection of tubes or the like no sort of dis
continuity requiring to be sealed by soldering or . erating machine itself shown in elevation;
2O
Fig. 4 shows the refrigerating machine of Fig. 20
welding. It cannot therefore become leaky, and
the gaseous or liquid refrigerating agent con
3 on a larger scale, partly. in outside elevation and
partly in central section; and
.
tained therein, for instance sulphurous acid, can
Fig. 5 shows a cross section on the line 3-3 in
not therefore escape into the cooling chamber,
25 thereby endangering food or the like that is_ to Fig. 4.
,
v
25
In Figures 1 and 2, l denotes the pot-shaped
be cooled, The motor and condenser mounted
upon the cover of the evaporator are readily ac
cessible for repairs or the like, and the motor
also for any changing of its windings for the pur
30 pose of enabling the machine to be used for a dif
ferent kind of current or for a different voltage.
Owing to the fact that the compressorand the
regulator for the refrigerating agent are suspend
ed from the evaporator cover inside the evapo
35 rator, there is the possibility, in addition to the
simple and compact assemblage of these mem
bers, of rendering the members suspended from
the cover quickly and conveniently accessible for
repairs and the like by removing the said cover.
'40 ‘The mounting of the compressor in the evapora
tor yields a particularly noiseless working of the
compressor. The motor arranged outside the
evaporator is not exposed to any injury from the
gases of the refrigerating agent.
evaporator, closed at the top by a lid or cover 2.
The cover is secured by means of screws 35 to an.
annular ?ange 4, forming the upper end of the
evaporator pot. This ?ange 4 bears upon the 30
cover ‘I of the cooling chamber by means of an
India rubber ring 5. The evaporator thus pro
jects through an aperture 36 in the cooling cham
ber cover into the cooling chamber itself, and is
sealed from the atmosphere by the India rubber 35
ring 5. Above, upon the cover, is ‘mounted loose
an electric motor l6 for driving the compressor,
with a magnet casing 23, the evaporator cover
forming at the same time'the lower bearing plate
of the motor. Around the motor is arranged the 40
condenser l5. On the under side of the cover 8
and inside the evaporator are suspended the com
pressor 2 and the regulator 3 for the refrigerating
agent, the former owing to the fact that its cas
45
The compressor is preferably in a layer ‘of lubri- I ing is made in one piece with the cover, and the 45
latter by means of its supply pipe I8. The com
eating oil provided above the ‘surface of the lique
pressor and the refrigerating agent regulator are
fled refrigerating agent, as a result of which a located in a layer of oil 34 provided above the
very simple and reliable lubrication of the moving surface 33 of the liquid refrigerating agent accu
5 o. parts of the compressor and its driving shaft, not mulating in the evaporator. An extension 29 of .50
requiring special‘ attention, is rendered possible, the motor shaft passes through the cover 8 by
and the durability of the machine is ensured. The means of a packing 25 for the purpose of driving
pot-shaped evaporator. renders it possible to slip
on to it, for the purpose of enhancing thecool
55 log effect, and without the space required for the
the compressor.
-
The armaturel?of the motor is carried by a
sleeve 31, which is mounted upon a step 38 on the 55
2
2,090,297
motor shaft, and is iournalled at its upper end
in the magnet casing 23. Upon the upper end
of the shaft 29 is secured by means of a nut 39
a fan. 22, which is located in an aperture 48 at
the top of a hood 2|, which surrounds‘ the con
denser l5, and is completely open at its lower
end. This hood is preferably carried by a few
arms secured to the cover 8 and distributed round
ring 46, bent out into the ribs 45, for the purpose
of reinforcing the cooling action.
The bottom 9 of the evaporator is drawn in
wards, and in the recess 49 thus formed is lodged
a freezing pan III.
This is carried by a dish or
cup || made of insulating material, which is
slipped into the recess from below. By means of
radial upper attached ribs 41 of the dish carrier
its periphery, and the condenser I5 is preferably II, the bottom of the freezing pan I0 is located
10 carried by its supply pipe I1 and its discharge
at a distance from the bottom of the pan carrier,
‘pipe I8‘, which are to be secured to the cover 8. ' and is supported in the latter. Furthermore the
The cover 8 is preferably so shaped that the pipes pan carrier has on its periphery notches I3,
I1 and I8 can pass through it outside the mag
through which the. cold air arising above the
net casing 23. At its lower and upper ends the freezing pan can pass underneath the bottom of
15 magnet casing is provided with holes 24. For the freezing pan and flow away through the
repairing work. or the like, the hood 2|, the nut aperture H. For the purpose of holding the pan
39 and the wind vane 22, the magnet 23 and the carrier fast in the recess of the evaporator, there
armature l6 can be conveniently removed from may be soldered to the latteran ‘inwardly pro
the cover 8. Similarly by unscrewing the evapo-v jecting pin l2, which can be lodged in a notch 48
rator cover 8, the machine parts suspended from in the wall of the freezing, pan carrier when the 20
the under side of the latter can be quickly and latter is inserted.
conveniently made accessible. The entire ma
The main portions of ‘the machine illustrated
chine can be quickly and conveniently suspended in Figures 3 to 5 are the pot-shaped evaporator,
in the pantry or cooling chamber or removed |, its upper closure cover 8, upon which is mount
therefrom.
'
ed the motor 23, and the compressor 2, ?tted
The‘ regulator 3 for the refrigerating medium to the under side of this cover, this compressor
encloses in the usual manner a float with'a nee
dipping into the layer of oil 34. The latter, how
. dle valve secured thereto below, which co-oper
ates with a discharge pipe 32 connected with the
30 regulator and extending down to about the bot
tom 9 of the evaporator. A crank pin 4| pro
vided at the lower end of the shaft 29 drives the
compressor piston 44 through the medium of a
connecting rod 42 and a pivot bolt43, and is sup
ported by means of a footstep bearing, which con
sists of a ball 28, which rests upon a‘ spring 21,
which in its turn rests in a cup-shaped extension
26 of the compressor casing 2. All the movable
parts of the compressor, even the suitably con
40 structed bearing of the driving shaft 29 in the
cover 8,_ undergo ample lubrication by the oil
surrounding them. To an inner annular groove
38 in the compressor cylinder is connected a suc
tion plpe 3| opening freely near the cover 8, and
45 to the ?oor i9 of the compressor casing, equipped
_ with a non-return valve 29, is connected 9. pres
'sure pipe l1.
‘
ever, now rests in a. special oil. pan‘ 50, the gas
suction space 5| above the layer of oil being placed
in communication, by a pipe 52 passing through 30
the bottom of the oil pan in an oiletight manner,
with a gas space 53 located below the oil pan and
above the surface 33 of the condensed refrigerat
ing medium.
.
'
The oil pan 50 is formed at its upperv edge with 35
an annular ?ange 54, by means of which it is
lodged in a gas-tight manner between the cover
8 and the ?ange 4 at the top of the evaporator.
The evaporator ?ange 4 rests by means of the
India rubber packing ring 5 upon the top wall ‘I 40
of the cooling chamber 55 of the cooling cup
board 62, in such a way that the evaporator pro
jects into the cooling chamber through an apera
ture 36 in the said wall. By means of’ a coupling
56 the shaft 29 of the motor is secured to a shaft
extension 51 serving for driving the compressor.
The ‘cover l9 of the compressor cylinder is pro
vided in a manner not shown in the drawings,
.with a suction aperture opening into the gas space
Through the pipe 3| the compressor draws in‘ 5|. Furthermore there is connected to it a pres 50
gaseous refrigerating medium by suction when sure or delivery pipe H, which leads to the con
the motor is working and forces it through the ‘ denser |5 encircling the motor. The discharge
pipe |'| into the condenser l5. In the latter the - tube | 8. of the condenser leads to the refrigerating
compressed gas, with the co-operation of the medium regulator 3 suspended from the cover 8
55 cooling which the condenser undergoes owing tov in the gasspace 53. At the top of the motor
the fact that the wind vane 22 sucks air through shaft 29 is mounted a fan 22. There is slid up
the hood 2l'in the direction of the arrows,-is from below on to ‘the evaporator, for the purpose
The refrigerating machine as so far described
works in the following manner:—
lique?ed, while at the same time, through the
holes 24 in the motor casing, air is sucked for
60 the purpose of cooling the motor. The regulator
3 for the refrigerating medium allows a quantity
of enhancing the cooling action, a sheet metal
ring 46, which carries convexities projecting out
wards like ribs. The bottom 9 of the evaporator 60
of the liquid refrigerating medium ?owing to it
through the pipe l8 to ?ow away through the
pipe‘ 32, this quantity corresponding to the quan
65 tity of gas sucked in through the pipe 3|. The
cavity 49, into which can be frictionally inserted
a metal freezing
it, when is provided un
liquid refrigerating amedium accumulating in the.
‘evaporator now evaporates, and in'so doing with
drawsheat from the wall of the evaporator,
thereby cooling the air' surrounding the latter.
70 The bubbles of gas ascend through the layer of
lubricating oil 34, into the gas chamber located
above the latter, out of which they are icon
tinually sucked away again through the pipe 3|
in the manner hereinbefore described.
Onto
_v the pot-shaped evaporator | is slipped a cooling
is drawn inwards, in such a way as to produce a
derneath with a bottom cove ' g 58 of insulating
material. The motor 23, and with it the con
, denser I5 and the fan 22, are enclosed by a sheet‘
metal hood 59, mounted upon the top wall ‘I of the
cooling chamber. This hood has a removable‘
cover 60, and lateralair inlet and outlet aper~
tures 6|.
»
I
..
70
The action of therefrigerating machine ‘illus
trated in Figures 3 to 5 is fundamentally the same
as that of the machine shown in Figures 1 and 2,
only a better cooling effect is obtained. ‘This is
primarily because the gas evolved by thelayer of 75
aoeaac'r
refrigerating medium 33 in the space 53 now
passes through the tube 52 directly into the gas
suction space 5|, that is to say, it no longer has
to bubble through the oil layer 34. The gas
therefore takes up to a far smaller extent the‘
heat absorbed by the layer of oil 34 from the
compressor. The gas in the gas space 5| is
therefore cooler than the gas that accumulates
above the-layer of oil 34 in the embodiment
10 shown in Figures 1 and 2, and can there transmit
its heat directly to the evaporator pot l, diminish
3
extending downwards through the evaporator
cover in a gas-tight manner to drive the com
pressor, a regulator for the refrigerating medium,
likewise suspended in the evaporator from the
under side of the cover, a ribbed cooling ring
surrounding the evaporator.
4. A compression refrigerating machine for
pantry refrigerators, comprising a pot-shaped
evaporator projecting into a chamber to be cooled,
a cover closing the top of the evaporator, an 10
electric driving motor mounted upon the said
ing the cooling action of the latter. This direct cover, a condenser encircling the motor, a com- '
transmission of heatfand likewise the direct pressor suspended in the evaporator from the
transmission of heat from the oil layer 34 to the 1 under side of- the cover, the shaft of the motor
15 evaporator pot, is now prevented by arranging the
layer of oil 34 in the special oil pan 50.
extending downwards through the evaporator 15
' cover in a gas-tight manner to drive the com
The small quantities of oil which are carried ' pressor, a regulator for the refrigerating medium,
along by the compressor piston, and pass through
the condenser I5 and the refrigerating medium
20 regulator 3 into the layer of refrigerating medium
33 and ?oat upon the latter, are sucked away,
so far as the 011 surface 62 formed thereby rises
above the lower end of the tube 52, in consequence
of the partial vacuum in the gas suction space
25 5 i, through the pipe 52 into the oil pan 50. There
is thereby obtained an automatic regulating of
the oil level in the pan, so that ample lubrication
~ of the compressor and its driving members is
always ensured.
30
,
What we claim is:—
1. A compression refrigerating machine for
pantry refrigerators, comprising. a pot-shaped
evaporator projecting into a chamber to be cooled,
a cover closing the top of the evaporator, an elec
35 tric driving motor mounted upon the said cover,
likewise suspended in the evaporator from the
under side of the cover, the bottom of the evap- orator being drawn inwards to form a recess, 20
and a freezing pan lodged in the said recess.
5. A compression refrigerating machine for '
pantry refrigerators, comprising a pot-shaped
evaporator projecting into a chamber to be cooled,
a cover closing the top of the evaporator, an elec
25'
tric driving motor mounted upon the said cover,
a condenser encircling the motor, an oil pan con
taining a layer of lubricating oil provided inside
the evaporator and above the surface of the lique
?ed refrigerating medium in the evaporator, leav 30
ing intercommunioating gas spaces above and be
low the said oil pan, a compressor suspended in
the evaporator from the under side of the cover
and immersed in the said lubricating oil, the shaft 1 -
of the motor extending downwards through the 35
a ‘condenser, encircling the motor, a compressor * evaporator cover in a gas-tight manner to drive
suspended in the evaporator from the under side
of the cover, the shaft of the motor extending
downwards through the evaporator cover in a
40 gas-tight manner to drive the compressor, and
the compressor, and a regulator for the refriger- ,
ating medium, likewise suspended in the evap
orator from the under side of the cover.
6. A compression refrigerating machine for 40
a regulator for the refrigerating medium, like
wise suspended in the evaporator from the under
pantry‘ refrigerators, comprising a pot-shaped
side of the cover.
a cover closing the top of the evaporator, an elec
tric driving motor mounted upon the said cover,
a condenser encircling the motor, an oil pan con 45
'
2. A compression refrigerating machine for
45 pantry refrigerators, comprising a pot-shaped
evaporator projecting into a chamber to be cooled,
a cover closing the top of the evaporator, an
i electric driving motor mounted upon the said
cover, a condenser encircling the motor, a layer
50 of lubricating oil above the surface of the lique
?ed refrigerating medium in the evaporator, a
compressor suspended in the evaporator from
the under side of the cover and immersed in the
said lubricating oil, the shaft of the motor extend
55 ing downwards through the evaporator cover in
a gas-tight manner to drive the compressor, and
a regulator for, the refrigerating medium, like
wise suspended in the evaporator from the under
side of the cover.
'
g
3. A compression refrigerating machine for
pantry refrigerators, comprising a pot-shaped
evaporator projecting into achamber to be cooled,
a cover closing the top of the evaporator, an
electric driving motor mounted upon the said
cover,‘a condenser encircling the motor, a com
pressor suspended in the evaporator from the
under side of the cover, the shaft of the motor
evaporator projecting into a chamber to be cooled,
taining a layer of lubricating oil provided inside
the evaporator and above the surface of the lique
?ed refrigerating medium in the evaporator, a
?ange round the upper margin of the oil 'pan,
this ?ange being lodged in a gas-tight manner 50
between the upper edge of the evaporator and
the ‘edge of its cover, a tube passing in a. ?uid
tight manner through the bottom of the oil pan
to establish communication between a gas space
above the surface of the oil and a gas space be. 56
tween the bottom of the oil pan and the surface
of the lique?ed refrigerating medium in the evap
orator, a compressor suspended in the evaporator
from the under side of the cover and immersed
in the said lubricating oil, the shaft of the motor
extending downwards through the evaporator
cover in a gas-tight manner to drive the com
pressor, and a regulator for the refrigerating .
medium, likewise suspended in the evaporator
from the under side of the cover.
HANS GéLDNER.
WILHEIM BOCK.
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