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Патент USA US2411929

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Dm.~ 3, 194s; _
s, MALKE
RQTARY COMPRESSOR
Filed June 24, 1944
2,411,529
~ `
’ I.
l2 Sheets-Sheet
_
Sven Malke
IN VEN TOR.
ATTORNEY
‘i ~ K
v
Dec. 3, 1946.
'
s. MALKE
“
ROTARY
ì
COMPRESSOR
Filed June 24, 1944
2,411,929
Y
y
2 Sheets-Sheet-Z
` Sven Malke
INVEN TOR.
' @affßq
AT TORNEY.
Patented Dec. 3,1946
2,411,929 -
UNITED s'rA'rEs PATENT omer.
ROTARY COMPRESSOR
Sven Maike, Milwaukee, Wis., asllg'nor to A. 0.
Smith Corporation, Milwaukee, Wis., a corpo
ration of New York
Application June 24, 1944, Serial No. 541,915
14
(Cl. 23d-177)
.
l
i
The invention relates to a rotary compressor
is preferably disposed on the shaft at 180° to the -
and more particularly to a compressor that may
other eccentric. The rotation of the eccentrica
be employed with refrigeration units and the like.
One object. of the present invention is t0 pro-4
by shaft 3 reciprocates the pistons I0 within
vide a rotary compressor in which lubrication
is simplified and friction and vibration is sub-l
stantially eliminated.
_
- Another object is to provide a lighter weight
their respective cylinders 4 and l. .
The arrangement whereby the axes of ‘eccen
l tries II are offset from the axis oi’ shaft l and
-the axis of rotation oi’ cylinders 4 and l is also
odset from that ofthe shaft, effects rotation of
rotary compressor unit that is readily fabricated
cylinders 4 and I .by the eccentrica at one-half
10 the speed of the shaft 3, and also the recipro-v
and assembled.
cation of pistons I0 in their respective cylinders.
A further object is to provide a rotary com
pressor of improved volumetric efficiency perunit ’
The cylinders 4 and l are provided'with inlet
delivery oi' tluid for piston displacement.
ports‘ I2 at their inner ends for the intake of
Other objects and advantages of the invention
fluid, and the’diagonal -ports I2 `at their outer
ends for the discharge of iluid. The inlet ports
will be set forth in the following description of_
an embodiment of the invention illustrated in
I2 constitute recesses in the walls of the cylinders
the accompanying drawings.
by-passing the pistons I0 _when the latter are
In the drawings:
_
at the extreme inward positions of their re
Figure l is a longitudinal sectional view of
spective strokes.
the rotary compressor of‘the invention designed 20 The ports vI2 communicate lwith the central
for refrigeration units;
fluid intake chamber around the shaft 3 and
Figure 2 is a section taken on line 2-2 of
Figure 1 looking ln the‘direction of the arrows;
Figure 3 is a section taken on line 2--3 of
extend in registered relation on a circumfer
ential line whereby they are closed by the piston
I0 after the commencement of the reversal of v
Figure 1 looking from the left- and showing in 25 the piston stroke and open to receive duid when
particular the left hand collector end ring with
the piston of the respective cylinder is in the
a part of the ring broken away; '
extreme retracted position.
, Figure 4 is la section taken on line 4-4 of
The ports I3 are disposed only in the outer
Figure 1 showing a topv plan view of one of the
wall of each cylinder 4 and I and extend di
cylinders and
.
'
agonally through the cylinder wall to the outer
Figure 5 is a section similar to Figure 1 show
ing a modiiled construction utilizing theprinf
ciples of the invention.
'
The rotary compressor of the invention com
prises in general an outer casing having a cupped
shaped cylindrical member I sealed and closedy
at its open end by a relatively natmember ,2
secured thereto in any. suitable way, as by bolting
the members together.
.
.
A shaft 3 is journaled .in the opposite ends of
the casing, axially thereof. and extends through
the head 2 for connection to a motor shaft or
the like.
The cylinders 4 and i are secured together at
right angles to each other by'bolts l, the shaft I
passing transversely therethrough offset from the
center of each cylinder. The cylinders are
mounted for rotation on end bearings ‘I- extending
inwardly from the ends of the casing, the axis
of rotation of the cylinders -being offset from the
axis of the shaft I. The cylinders 4 and 5 are
closed at their outer ends by removable caps
l and. each cylinder has its outer wall iianged '
to provide a fiat circularplate 9 integralthere
with and lying in a piane at right angles to
the axis of-rotation of the cylinder.
The pistons I0 are reciprocably disposed with- l
' in each of the cylinders 4 and B and the central
bore of each piston houses a cylindrical eccentric
II which is formed intesral with the shaft
most area of the piston displacement space or
cylinder chamber I4.
The closure member 2 of the compressor casing
which is shown at the right side of Figure 1 is -
_formed with a ring shaped collector shoe IB
adapted to engage the lplate l formed integral
with the wal1 of the adjacent cylinder 4.
’ The collector shoe of member 2 is provided
with a passage I8 the inner end of which alter
'nately registers‘with one of the diagonal ports
Il extending through the sidewall of cylinder
4 and the outer portion of which is fabricated
for receiving any suitable connection to carryoff `
the compressed fluid.
At the left side of Figure 1, the collector shoe
I‘I there shown, which is similar to shoe II, is
mounted and held against rotation on casing
member I by a plurality of studs Il but is per
mitted limited axial movement. A plurality of
springs I9 are seated within suitable apertures
in collector shoe» Il and bear against the casing
wall. This gives a floating support to the entire
compressor assembly in service and eliminates
tolerance problems, since the springs I9 serve to
bias the ‘collector shoe Il against plate 9 formed
integral with cylinder 5 and to bias all of the
moving parts to the right to also maintain a tight
` seal between cylinder 4 and collector shoe I5.
The springs I 8 thereby compensate for manufac
2,41 1,929
friction is substantially eliminated by the parf
turing tolerances in the construction of the com
pressor.
_
ticular t`ype of construction employed.
_
'
The sealing surface for the fluid passages
A passage 20 is provided through the outer por
the end of the unit where there is no chance for
tion of the collector shoe I1 and through the cas
binding. The floating support of the assembled
ing member I to carry off discharge fluid from
parts of the unit compensates for tolerances and
diagonal ports I3 in the wall of cylinder 5 when
clearances and maintains the required seals.
each port registers with passage 20 in the course
Various embodiments of the invention may be
of rotation of the cylinder. The passage 20 is
employed within the scope4 of the accompanying
connected by a short bellows coupling 2I to the
10 claims.
'
outlet 22 for the pump.
I claim:
The shaft 3 may have a longitudinal port 23
1. A rotary compressor comprising a cylinder
and suitable transverse ports 24 communicating
rotatably disposed on a fixed bearing to rotate
therewith for the purpose of distributing lu
on a vtransverse axis, reciprocating means for
bricants to the desired bearing surfaces.
compressing fluid in said cylinder, a transverse
'I'he actual operation of the compressor of the
shaft supporting said means and extending
invention may be confined to describing they op
through said bearing to rotate said means on an
eration of cylinder 4 and its associated parts since
axis offset from the transverse axis of the cylin
the description with respect to cylinder 5 would
der to effect rotation of the latter and recipro
be similar.
.
cation'of said means therein, passages through
Referring now to Figure l, the piston -III is
a
side wall of said cylinder to supply fluid thereto
_ shown at the end of the stroke. At this time the
during a portion of the rotation cycle of the
fluid enters through inlet ports I2 into chamber
cylinder and to discharge compressed fluid from
I4 of cylinder.4. Upon entry of fluid into cham
the cylinder during another portion of the rota
ber I4 piston I0 begins to advance on its reverse
tion cycle of the cylinder, and valve means op
stroke by action of eccentric I I rotated by shaft 3.
erable in response to the rotation of said cylinder
The collector ring I5 closes the outlet port I3
to
open _and close said passages in synchronism
during the time when the piston I0 is in its com
with the reciprocation of said first named means.
pression stroke and is being advanced in chamber
2. A compressor comprising a cylinderrotat
I4 toward the head of the cylinder by eccentric
ably disposed on a fixed bearing to rotate on a
30
II to compress the fluid contained within thev
transverse axis, a reciprocating piston for com
chamber and until the piston I0 is substantially
pressing fluid in said cylinder, a transverse shaft
in the extreme outward stroke position.
supporting said piston and extending through
In the final stages of compression of the fluid
said bearing to rotate the piston on an axis offset
the rotation of cylinder 4 registers port I3 with
from the transverse axis of yrotation of the cylin
passage I3 in collector ring I5 and the compressed 35 der to effect rotation of »the latter and Vrecipro
fluid is discharged through the registering port
cation of the piston therein, a passage through
and passage by the'flnal stroke movement of the
the side wall of ’said cylinder to supply fluid
piston in chamber I4. The cycle of inflow of
thereto and discharge compressed fluid therefrom,
-fluid into chamber I4 and compression of the 40 and a collector 'plate disposed against the side
same in the manner described is then commenced
wall of said cylinder to close the said passage dur- °
again to provide for a continuous pumping of
compressed fluid.
l
While at one end of _cylinder 4 the piston I0
is compressing and discharging ñuid through port
I3, at'the' other end the piston III is beingfree‘
tracted and effects the entrance of iiuid through
ports .I2 at that end.
Since cylinder 5 is preferably disposed at a 90°
angle to cylinder 4 there are four discharges 'of
compressed fluid for each complete revolution of
the cylinders, and for every two revolutions of
the shaft.
'
,
In the embodiment of Figs. 1 to 4, the outer
casing need not be sealed and can be eliminated.
The inlet of :duid is provided through conduit 25
and passage 26 in the end bearing 'I to ports-I2
ing the compression cycle and to open said pas
sage for supply and discharge of fluid there
through.
3. A compressor comprising a cylinder rotat
ably disposed on a transverse-axis, reciprocating
means for compressing fluid in said cylinder, a
passage through the side wall of said cylinder to
discharge compressed fluid therefrom, a collector
plate disposed in said compressor- to close ‘said
passage during the compression cycle, and float
. ing support means to support said collector plate
and bias the same against said cylinder wall to
substantially eliminate clearance problems in the
assembled parts.
_
`
‘
4. A compressor comprising a cylinder rotat
ably disposed on a transverse axis, reciprocating
means for compressing iluid in said cylinder, a
radially spaced around each cylinder.
In the modified construction illustrated in Fig. - passage through the side wall of said cylinder
5, there is no outer casing and air enters the cyl 60 to discharge Icompressed fluid therefrom, a col-,
inders directly through the ports I2' in the cylin
lector plate disposed in said compressor to -close
said passage during the Acompression cycle, a
der walls from the outside. In this construction
passage in said collector- plate registering with
the ports I 3’ may also-be used for inlet of ñuid
to the cylinders by uncovering the same during
the passage in said cylinder during the discharge
the intake stroke of the pistons. This is readily 6.5 cycle to provide means to carry olf the discharged
compressed fluid, and floating support means to
accomplished by slotting the collector ring I5' in
support said collector plate and bias the same
the sector representing the intake cycle of the
respective cylinders. In Fig. 5 collector ring I5'
` against said cylinder wall to substantially elimi
is sectioned at the top where the discharge cycle
nate clearance problems in the assembled parts.
5. _A rotary compressor comprisinga casing
is shown but atlthe bottom-of the figure where 70
having a cupped s_hapedmemberclosed at the
the inlet is shown the' ring I5" is not sectioned but
is in full, representing a slot therein through
open end by a substantially flat closure member,
a shaft journaled for rotation in said casing,
which _air may pass to port I3’.
The invention provides a rotary compressor
eccentrics disposed-on said shaft at substantially
in which lubrication is held at a minimum since 75 180° to each other. a pair of cylinders mounted
2,411,929
I in said casing eccentric to said shaft and secured
together at substantially right angles to each
other, pistons provided in each of said cylinders
- and disposed on> the shaft for reciprocation by
said eccentrics, passages disposed in the wall of
each of said cylinders for inlet and outlet of
fluid, and a collector plate disposed at each end
of the casing to close the discharge passage in
each said cylinder during the compression cycle
thereof and to open- the same for discharge there
„ after.
6. A rotary compressor comprising a casing
having a cupped shaped member closed at the
open end by a substantially ilat closure member,
a shaft journaled for rotation in said casing,
eccentrics disposed on said shaft at substantially
180° to yeach other, a pair of cylindersmounted in
said casing eccentricto said shaft and secured
together at substantially right angles to each
v other, pistons provided in each of said cylinders
and disposed on the shaft for reciprocation by
said eccentrics, passages disposed in the wall of
each of said cylinders for inlet and outlet of
_ A
discharge from the ends` of the cylinders as the
latter rotate.
~_
.
10. In acompressor of the class described, a
cylinder, a collector plate against which one side
wall of the cylinder rotates, said cylinder side
wall having an outer port disposed to be closed j
by the collector plate during the compression
portion of the compressor cycle, said collector
plate having a port for transmitting compressed
fluid discharged through said cylinder port dur
ing the discharge portion of the compressor cycle,
and said collector plate uncovering said cylinder
port to provide for inlet of fluid to the cylinder '
during the intake portion of the compressor cycle. 11. In a compressor of _the class described, a
cylinder, a collector plate against which one side
_wail of the cylinder rotates, said cylinder side
wall having an outer port disposed to be closed by
the collector plate during the compression por
tion of theV compressor cycle, said collector plate
having a port for transmitting compressed fluid
discharged through-said cylinder port during the
discharge portion of the compressor cycle, said
collector plate uncovering said cylinder port to
of the casing to close the discharge passage in 25 provide for inlet of fluid to the cylinder during
the intake portion of the compressor cycle, and
each said cylinder during the compression cycle
an auxiliary intake port for said cylinder adapted
thereof and to open the same for discharge there
to be opened' and cut off by a reciprocating piston
after, one of said collector plates being ?oatingly
in the cylinder.
v
supported on'the casing and biased against its
fluid, and a collector plate disposed at each end l
12. In a compressor of the >class described. a
respective cylinder to eifect a constant seal of 30
cylinder, bearings for rotatably supporting said
the collector plates against the rotary cylinders.
' cylinder on a transverse a‘xis, a rotary shaft ex
7. In a compressor of the class described hav-tending through and eccentrically of said bear
ing a pair of angularly disposed cylinders secured
ings, a piston in said cylinder, an eccentric on
together and mounted for rotation eccentric to
a shaft passing transversely therethrough, a pair 85 said shaft for operating said piston a“d for ro
tating said cylinder on its bearings, an inlet port
of. opposed collector plates spring biased _toward
in the side of the cylinder adapted to be covered ì
each other and between which said cylinders ro
and uncovered by the piston in said cylinder,
tate with a side wall of each cylinder engaging the
and an outlet port in said cylinder disposed to be
face of a collector plate, and inlet and discharge
ports in the cylinder walls adapted to be closed 40' opened at predetermined cycles in response to
rotation of said cylinder for discharge of com
by said collector plates duringv the compression
cycle of the respective cylinders and to register
with passages in the collector plates to providel
' for the control of fluid discharge from the ends
of the cylinders.
.
8. In a compressor of the class described hav
ing a pair of angularly disposed cylinders se
cured together and mounted for rotation eccen
tric to a shaft passing transversely therethrough, _
pressed iluid.
»
13. In a compressor of the class described, a ~
cylinder, bearings for rotatably supporting said
cylinder on a transverse axis, a piston in said
cylinder operative to compress fluid therein, a
rotary shaft extending eccentrically through one
of said bearings and supporting said piston to op
erate the same, an. inlet port in the side of saidv
a pair of opposed collector plates facing toward 60 cylinder adapted to be covered _and uncovered
by the piston during operation thereof, a pas-'
each other and between which said cylinders
sage through one of lsaid hearings for con
rotatewith a side wall of each cylinder engaging
ducting fiuid to said inlet port, and an outlet '
the face of a collector plate, and _inlet and dis
port in said cylinder disposed to be opened at
charge ports in the cylinder walls adapted to be
closed by said collector plates during the com 56 predetermined cycles in response to rotation of
said cylinder for discharge of compressed fluid.
pression cycle of the respective cylinders and to
' register with passages in the collector plates to '
provide for the control of fluid discharge from
the ends of the cylinders.
9. In a compressor of the class described hav
ing a pair of angularly disposed cylinders se
cured together and mounted for rotation eccen
tric to a shaft passing transversely therethrough,
a pair of opposed collector plates facing‘toward
each other and between which said. cylinders
rotate with a side wall of each cylinder engaging
the face of a collector plate, inlet ports in said
14. In a compressor of the lclass described, a
cylinder, bearings for rotatably supporting said
cylinder on a transverse axis, a rotary shaft ex
tending through and eccentrically of said bear
ings, agpiston in_said cylinder, an eccentric on '
said shaft for operating said piston and for rotat
ing said cylinder on its bearings,.an inlet port
in the side of the cylinder adaptedto be covered
and uncovered by the pisto'n in said cylinder. a
`*passage through one of said bearings for con
ducting fiuid to said inlet port, and an outlet
port in >said cylinder disposed to be opened at
cylinder walls adapted to be controlled by pistons
predetermined cycles in response to rotation of
in the cylinders, and discharge ports in said cyl
inder walls adapted to be closed by said collector 76 saidcylinder fordischarge of compressed ñuid.
plates and to register with passages in the col
SVENMALKE.
lector plates to provide for the control'of fluid
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