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Патент USA US3088679

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May 7, 1963
3,088,660
R. F. voGGENTHALx-:R
ROTARY AIR COMPRESSOR
Filed Aug. 25. 19Go
_
.INVE'NTOR
RALPH Í'.- VOGGE'NTHÁLER
B
‘NRQRÑ
ms
TTORNEY
Unite States arent
1
3,088,660
ROTARY AIR COMPRESSOR
Ralph F. Voggenthaier, Painted Post, N.Y., assignor to
îngersoll-Rand Company, New York, NX., a corpora
tion of New Jersey
Filed Aug. 23, 1960, Ser. No. 51,370
S Claims. (Cl. 230-207)
hee
Y
assassin
Patented May 7, 1963
2
at the left in the drawing, head 30 includes a cover mem
ber 34 with a flange 36 that encircles the adjacent plate
v32. Rotor 14 is provided with a cylindrical end 3S that
extends through plate 32 and into head 30. Head 30
has a bore 40 within which is disposed an anti-friction
»bearing 42 for rotor end 38.
Likewise, the opposite end head 31 is provided with a
cover member 44 having a bore 46 to receive anti-friction
bearing 48- for the cylindrical end 50 of rotor 14 that
more particularly, to a compressor having vanes mov 10 reads into head 31. The bearings 42 and 48 support
rotor 14 which is freely rotatable, and longitudinally
able in cylinders of the compressor rotor to produce
slidable to the extent permitted by plates 32 and 33.
positive displacement Within the cylinders.
The compressor is provided with a drive shaft 52
in this type of compressor, sealing of the end faces
This invention relates to rotary type compressors and,
that extends through plate 32, into member 34, and is
of the rotor is a problem inasmuch as there is very little
clearance permissible and end thrust on the rotor neces 15 carried by suitable thrust and radial bearings 54 disposed
in «bore 40 for rotation coaxially with rotor 14. Suitable
keepers 56 on shaft 52 prevent axial shaft movement
with respect to bearings 54. A retainer 58 bolted to the
end of member 34 holds bearings 54 in place and also
Another object of this invention is to provide a com 20 houses a suitable mechanical type seal 60 for shaft 52
that cooperates with a seal plate 62 screwed to retainer
pressor having means for preventing transmission of
518 and through which the end of shaft 52 projects. Drive
thrust from a drive and/ or a driven shaft to the rotor.
shaft 52 has a spline connection with rotor end 38 of
Another object of this invention is to provide a lubri
rotor 14, and to this end, rotor end 3S is hollow and
cating and cooling system in a compressor that has thrust
sitates a very finely adjustable thrust bearing.
it is an object of this invention to eliminate thrust by
permitting the rotor `to ñoat freely endwise between the
compressor face plates.
isolating means for the rotor.
Another object of the invention is to provide a com
provided with splines 64 for engaging corresponding
pressor simple to ldesign and to manufacture and having
rotor 14 inasmuch as those two elements are individually
long life.
Other objects and advantages of the invention will be
68 of shaft 52 may ñt the bore 70 of rotor 14 to act
splines 66 on shaft 52.
Shaft 52 needs no bearing Within
and coaxially supported to rotate together, but the end
in part obvious and in part pointed out Áin the following 30 as a pilot.
At the end opposite drive shaft 52 the compressor
description of a preferred embodiment.
is provided with a driven shaft 72 having a piloted Splined
The drawing is a longitudinal section of a vane type
connection indicated at 74 with rotor end 50 that extends
air compressor embodying the features of the invention.
into member 44. Splined connection of shaft 72 with
Referring to the drawing the compressor has a casing
10 with a cylindrical bore or compressor chamber 12 35 rotor 14 is entirely similar to that of shaft 52. Shaft 72
is adapted to drive a fan (not shown) or other similar
within which is disposed a rotary element or rotor 14
`accessory and, therefore, extends outwardly of the com
with longitudinal radial slots or cylinders 16. Varies 18,
pressor. ln this instance, shaft 72 is adapted to operate
which may be of a conventional type well known in
a lubricating and cooling oil pump consisting of a gear
the art, are disposed in slots 16.
As is usual with such single stage compressors, casing 40 76 mounted directly on shaft 72 and a gear 78 mounted
on a shaft 80 which is disposed parallel to shaft '72.
10 has an inlet passage 20 and a discharge passage 22
Oil discharged by gears 76 and 7S, that provides lubri
preferably diametrically oppoed to each other. The inlet
cation and cooling for the compressor, passes into a dis
passage 20 is provided with a series of perforations 24
charge chamber 82 and thence into a passage 84 in
which extend into gouges 26 to extend the period of
admission of incoming gas into -bore 12. At discharge - member 444. Since passage 84 communicates with bore
46, there is a restricted oil flow through the bearing 48,
passage 22 similar perforations 2S are provided to con
through the clearance between rotor end 50 and the
duct compressed gas from bore 12.
opening in plate 33 through which end 50 passes, and
Casing 10 is provided with heads 30 and 31 to enclose
into the bore 12. A port 112 connects the discharge
the ends of bore 12 as well as to seal the ends of rotor
Heads 30 and 31 have end or face
chamber 82 to the interior of a retainer 114 to provide oil
plates 32 and 33, respectively, closely ñtting the end
which lubricates a shaft seal 116 constructed preferably
14 against leakage.
faces of casing 10 as well as the end faces of vanes 18»
like seal 60, as Well as a bearing 118 that supports shaft
and rotor 14 with only enough clearance being provided
for lubrication and slight temperature expansion. To»
72. Lubricating oil from bearing 48 flows through the
provide gas ñow into and out of the slots or cylinders
16, face plate 32 has radial passages 100 that communi
cate with the bore 12 through ports 102 adjacent the
rotor slots 16 and through ports 98 disposed near orradially outward of the periphery of rotor 14. Face:
plate 33 has passages 90, similar to passages 10d, thai 60
correspondingly communicate with bore 12 through ports
92 and 93 that correspond to ports 102 and 98, respec-l
tively. Thus, gas from the inlet 20l passes through ports
93 and 98 to respective radial passages 90 and 100„
thence escapes through respective ports 92 and 102 to‘y `
the bases of vane slots 16 at the inlet side of the com
pressor. Such ports and passages on the discharge side
of the compressor permit escape of gas in the slots 16
below the inwardly moving vanes to the compressor
`Splined connection '74 of shaft 72 and rotor end 50', a
passage 65 in rotor 14, and the splines 64 and 66` to bear
ings 42 and 54 in head 30. To prevent possible blockage
of this oil iiow, the piloted ends of shafts 52 and 72 can be
ported as at 53 and 73, respectively. The oil in head
30 flows through bearing 42, through the clearance be
tween the rotor end 318 and the opening in plate 32
through which end 38 passes, and into -bore 12. This
oil also flows through bearings 54 to lubricate seal 60.
To insure adequate lubrication of the vanes 18 and
vane slots :16, face plates 32 and 33 have ports 69 which
connect bore 40 to port 102 and bore 46 to port 92,
respectively, on only the inlet side of the compressor.
Thus, as air enters slots 16 from passages 100 and 90,
discharge 22.
oil in the respective bearings 42 and 4S flows through
ports 69 and 102, and 69 and 92, respectively, to the
slots 16 with the incoming gas. To provide additional
Rotor 14 is mounted in heads 30 and 31, and is eccen
trically disposed in bore 12. At the `driving end shown ~-
passages 94 and '96 are provided in casing 10.
oil to head 30 and bore 12, cross-over or transverse
If only
3,088,660
3.
4
one such passage is required, only passage 96 would be
retained. As shown, one `suph cross-over iiow path from
bearing 48 in head 31 to head 3@ is provided by a
passage 85 in head >3l that is connected to passage 96
by a port 88 in plateââ of head 3l. ~Passage 96 is con
having a plurality of ports between the cross-over passage
and the casing bore to provide :an oil spray in-to the corn
pressor chamber.
'
3. A rotary compressor comprising a casing having a
bore and an inlet and discharge in communication with
nected by a port «87 in plate 32 of head 3d to ka series
of interconnected passages 1016, 1108 and 11@ which com
ing the `boreto form la compressor chamber, 4a rotor eccen
municate with bore All of head 30 adjacent to the seal
trioally disposed in the chamber «and movable endwise
60'. The other or second cross-over llow path is pro
vided by a passage S6 in head ‘31 that connects passage
84 to cross-over passage 94 through a port 83 in face
plate 33 of head 31. Cross-over passage 9d» is con
nected to bore 4t) between bearings Se by a port 67 in
face plate 32 of head 30 and a passage 104.
between the heads, said rotor having a central bore and
cylindrical ends at the ends of the bore that project into
the heads and provide a flow path through the rotor, bear
ings in the heads for rotatively supporting the rotor ends
and »for permitting axial movement, a drive shaft inde
pendently supported in one 0f heads and having a con
nection to the rotor that transmits rotary movement and
isolates axial movement, -a driven shaft independent-ly
supported in the other head `and having a connection to the
rotor that Vtransmits rotary movement and isolates axial
movement, bearings in the heads for independently sup,
the bore, a pair >of heads connected to thecasing for clos
Temperature d-ue Vto compression within the compressor
is kept low by providing an oil spray in the compressor
and to this end lare provided perforations `120 into that
section of the cylinder bore from the cross-over oil pas
sage I96. Likewise for aftercooling purposes perforations
122 may ibe provided Ileading into bore `12 near dis-charge 20 porting the driving and «driven shafts, the heads having
passage 22 Vfrom cross-over passage 94. Lubricating oil
thus passing into the compressor lfrom heads 30 and 31,
and by way of the spraying perforations 1120 and i122
passes into Vthe discharge line and is removed therefrom
for re-use.
»
Drive shaft S2 is adapted to be provided with a pulley
which may lbe conveniently removed 4for connection of
that shaft with Ia direct drive. For this purpose, the end
of shaft `52 projecting from head 3i) is tapered as at 412d
passages in communica-tion with the »flow path through
the »rotor land providing a llow path `for lubricating and
cooling oil to the shaft connections and to the bearings,
said casing having atleast one cross-over passage in com
25 munication with the passages in the heads to provide a
,flow path -for oil from one of the heads to the other and
a pump housed in the head supporting the driven shaft
and driven by such shaft to supply the lubricating and
cooling oil.
and provided with la coupling flange 126 to which is -fast 30
4. The compressor according to claim 3, and lthe casing
ened by suitable cap screws 128 a pulley `130 of the mul
having a plurality of ports between the cross-over passage
tiple groove type that extends inwardly toward the com
and the casing bore to provide an oil spray into the com
pressor so that the pull normally applied thereto will be
pressor chamber.
A»substantially in line with bearings `54. Removal of cap
5. A rotary compressor comprising a casing having a
screws 128 permitsrready remova-l of pulley 130 and con
bore `and »an inlet and discharge in communication With
nection of flange 126 to la suitable direct drive coupling
the bore, la pair of heads connected to the casing, face
plates in the heads for closing the :bore to form a corn
(not shown).
As described above, it will be noted that rotor `14
pressor chamber, a rotor with -a plurality of spaced radial
mounted on bearings 42 and í48 independent of the shafts
vane slots disposed eccentrically in the chamber and being
52 and 72, exerts no bending forces in those shafts and is 40 movable endwise between the face plates, said face plates
self-centering. Pressures applied thereto at the end faces
having radially disposed passages providing ilow paths
of the rotor «by oil pressure from the pump -gears 76 and
7S have a centering effect which provides end sealing.
Similarly, `axial forces that may be exerted on shaft 52 or
between the base of the slots and the inlet and discharge
portions of the chamber, vanes in the slots movable ra
dially as the rotor turns, said rotor having a central bore
72 are not transmitted to rotor 14. Furthermore, a great 45 land cylindrical ends at the ends of the bore that project
advantage of lthis construction is that when the slots 16
through the -?ace plates into the heads Íto provide a flow
containing varies 18 wear, the rotor 14 may be reversed
path through the rotor, bearings in the heads for rotatably
end for end, and i-ts .life thus doubled. Likewise, the
splined connections of shafts 52 and 72, when reversed,
supporting the rotor ends and for permitting axial move
ment, a drive shaft independently supported in one of the
will have double the life of a rotor non-reversible.
50 heads 'and having a connection to the rotor that transmits
Thus, by the above construction ‘are accomplished,
rotary movement and isolates axial movement, a driven
among others, the objects hereinbefore set forth.
shaft independently supported in the other head and hav
I claim:
ing -a connection to the rotor that transmits rotary move
l. A rotary compressor comprising la casing having a
ment and isolates axial movement, bearings in the heads
bore and an inlet land discharge in communication with 55 for independently supporting the drive and driven shafts,
the bore, a pair of heads connected to the casing for clos
passages in the heads in communication with the ilow path
through the rotor 4and providing lubricating and cooling
trica-lly disposed in the chamber and movable endwise be
oil to the bea-rings and the sha-ft connections, and said
tween the heads, said rotor having a central bore and cylin
face plates having ports connecting the passages in the
drical ends at the ends of the bore that project into the 60 heads to the radially disposed passages in communication
heads and are Asupported therein for rotational and axial
with the inlet side of the chamber to provide oil to the
movement, a drive shaft independently supported in one
inlet iiow for lubricating the vanes and vane slots.
ing the bore to form a compressor chamber, a rotor eccen
of the heads iand having a connection to the rotor that
transmits rotary movement and isolates axial movement,
a driven shaft independently supported in the other head
yand having a connection to the rotor ’that transmits rotary
movement and isolates axial movement, said heads hav
ing passages that are interconnected ‘by the bore in the
rotor and provide a flow path for lubricating and cooling
6. The compressor `according to claim 5, and a pump
disposed in the head supporting the driven shaft, and
drliven lby such shaft .to supply the lubricating 'and cooling
o1 .
7. The compressor according to claim 5, and the casing
having a-t least one cross-over passage in communication
with the passages in the heads to provide a flow path from
oil to the shaft connections and to the supports for the 70 one head to the other for the oil.
shafts and the rotor, rand the [casing having at least one
8. The compressor according t-o claim 7, and the casing
having a plurality of ports between the cross-over pas
cross-over passage in communication with the passages in
sage and the casing bore to provide an oil spray into the
both heads to provide a flow path for oil -from one of the
compressor chamber.
heads to the other.
2. The compressor according to claim l, and the casing 75
(References on following page)
3,088,660
5
References Cited in the ñle of this patent
UNITED STATES PATENTS
2,498,972
Whiteley _____________ __ Feb. 28, 1950
2,862,655
2,937,807
Dickson ________ __- ____ _.- Dec. 2, `1958
Lorenz ______________ __ May 24, `1960
6
2,961,151
2,975,964
Fob‘i'an _____________ __ Nov. 22, 1960
853 204
’
Fmance ______________ __ Nov. 28, 1939
O‘sfnerkamp __________ __ Mau'. 21, 1961
FOREIGN PATENTS
5
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