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Патент USA US3069081

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DeC- 18, 1962
R. 1.. CARLSON
3,069,071
FANS HAVING RADIAL FLOW ROTORS IN AXIAL FLOW CASINGS
Filed March a, 1961
'
F19. 1.
4-4
.51 .
2 Sheets-Sheet 1
Dec. 18, 1962
R. L. CARLSON
3,069,071
FANS HAVING RADIAL FLOW ROTORS IN AXIAL FLOW CASINGS
Filed March 3, 1961
2 Sheets-Sheet 2
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United States Patent 0 Mce
1
3,069,071
’ FANS HAVING RADIAL FLOW ROTORS IN AXIAL
FLOW CASINGS
Raymond L. Carlson, Canton, Mass, assignor to Westing
house Electric Corporation, East Pittsburgh, Pa., a cor
poration of Pennsylvania
Filed Mar. 3, 1961, Ser. No. 93,202
3 Claims. (Cl. 230-417)
3,059,071
Patented Dec. 18, 1962v
2
zontally extending struts 27, the ends of which are se
cured to ‘an inner casing 30.
Auxiliary, radially-extending fan blades 32 are secured
to the outer side of the back plate 21, and their inner
ends are secured to the hub 20‘.
'
The inner casing 30 is cylindrical except that it has an
inner wall portion 34 shaped as a frustrum of a cone.
The casing 30 has a closed outer end wall 35, and has
an inner end wall 36 with a central clearance opening
‘ This invention relates to fans having centrifugal fan 10 37 around the hub 20. The wall portions 11 ‘and 34 have
rotors in axial ?ow casings, ‘and has as objects to reduce
extending through their upper portions a cylindrical fair
the sizes of, to reduce the noises of operation of, and to
ing 40 through which extend belts 41 on the pulley 26,
improve the performances of such fans.
and on pulley 43‘ of electric motor 44 supported on the
It has previously been proposed as shown vby the US.
top of the outer casing 10. The inner casing 30 is sup
Patents Nos. 928,624 and 1,604,328, to place centrifugal 15 ported trom the outer casing 10 by spin removing vanes
rotors in the axial flow casings of fans, the air discharged
45.
radially by the rotors being turned axially by the casings.
This invention provides an outer casing that is cylindri
cal except at its air outlet, where it is formed as a
The cylindrical portion of the inner casing 30 has the
same outer diameter as that of the fan rotor 18. There
is an ‘annular passage 46 between the rotor 18 and the
frustrum of a cone which converges in the direction of 20 outer casing 10, and between the inner casing 30‘ and the
air how, and provides a concentric inner easing that is
cylindrical and has the same diameter as the fan rotor
except at the outlet of the inner casing, where it is formed
as a r?rustrum of a cone which converges in the direction
outer casing 10.
The spin removing vanes 45 extend
across the downstream end of this passage.
There is a diverging outlet passage 50‘ between the wall
portions 34 and 11. This passage diverges so as to more
of air ?ow. The inner casing is closed at its outlet end, 25 completely ?ll the duct 12.
,
and encloses the shaft of the fan rotor which extends
In operation, the rotor 18 is rotated through the shaft
through its opposite end, and encloses the bearings of
25, the pulleys 26 and 43 and the belts 41 of the motor
the shaft. In one embodiment of this invention, the inner
44, and draws air or other gas to be moved, from the
casing also encloses a pulley on the fan shaft which is
duct 17, and through the inlet passage :16, and discharges
connected to a belt which extends through a fairing which 30 the air radially into the lannular passage 46 around the
extends through the inner ‘and outer casings, to a pulley
rotor 18. The outer casing 10 turns this
axially so
on the shaft of an electricmotor mounted on the outer
casing. The air inlet end of the outer casing is shaped
to provide a convergent, axial
inlet passage, formed
as a frustrum of a cone, to the fan rotor that has a diam
eter at the rotor, equal to that of the outlet end of the
that it passes through the passage '46, and through di
verging ‘discharge passage 50 into the duct 12.
The air entering the passage 46 from the rotor '18 is
35 spinning as a result of the rotation of the rotor, and flows
in .a horizontal spiral through the passage 46 without oh
struction or change in general direction until it has its
outlet passages around the rotor and the cylindrical por
spin removed by the vanes 45 at which time its spin
tion of the inner casing, reducing discontinuities of flow
velocity is ‘converted into pressure.
40
and resulting noise and ine?iciency.
The auxiliary fan blades 32 are rotated with the rotor
Fans of this type are often used for moving hot air
18, and draw air ‘from the space around the fan, through
and other gases, the heat from which might damage the
the fairing 40, and through the inner casing 30‘ around
bearings of the fans.
the bearings 27, and through the opening 37 in the inner
Another object of this invention is to cool the bearings
end wall 36 of the casing, and discharge this air into the
of such fans.
45 annular passage 46. Such a fan is frequently used to
This invention will now be described with reference to
move air or other gases having very high temperatures
the annexed drawings, of which:
which would damage the bearings 28 unless they were
FIG. 1 is a side view, partially in section, of a fan em
cooled hy the relatively cool air drawn over them by the
bodying this invention;
blades 32.
FIG. 2 is a section along the lines 2—2 of FIG. 1;
50
The auxiliary fan system also serves as a dynamic seal
FIG. 3 is a section along the lines 3—3 of FIG. 1, and
tor preventing possibly contaminated gas passing through
FIG. 4 is a plan View looking down on one of the spin
the main rotor from passing through the inner casing and
removing vanes of the fan.
fairing into the space within which the fan is located.
An outer casing 10 is cylindrical except that it has a
What is claimed is:
diverging outlet wall 11 formed as a frustrum of a cone. 55
l. A fan comprising a centrifugal rotor having a circu
A cylindrical outlet duct 12 has its inlet end connected
lar back plate, means forming an axial gas inlet passage
to the outlet end of the wall 11.
into said rotor, an inner casing having a cylindrical por
The casing 10 has its inlet end portion turned in to
tion downstream ‘with respect to gas ?ow through said
form a diverging inlet wall 14 shaped, except at its inner
fan of said back plate and concentric with said back
end where it has a short cylindrical portion 15, as a 60 plate,‘means including a shaft on the axis of said casing
inner casing. This construction provides aligned, annular
frustrum of a cone.
The ‘wall 14 forms a converging,
within said casing ‘for rotating said rotor, a ‘bearing in
said casing around ‘said shaft, said casing having one end
wall adjacent to and parallel to said back plate but spaced
ing 10 is supported on a base 24.
therefrom, said wall having a central clearance opening
A centrifugal tan rotor 18 has a diverging side plate 65 around said shaft, the opposite end wall of said casing
19 with its outer end around the wall portion 15. The
being closed, an outer casing having a cylindrical por
fan has a conventional hub 20 to which is attached a
tion around, spaced ‘from and concentric with said cylin
back plate 21. The usual fan blades 23 are supported
drical portion of said inner casing and said rotor, means
between the side plate 19 and the back plate 21. Shaft
extending through the downstream portion of said outer
25 of the rotor 18 has its outer end within and secured 70 easing into said inner casing and providing an air passage
to the hub 20, and has on its inner end a pulley 26. The
from the atmosphere around said outer easing into said
shaft 25 is supported in bearings 28 attached to hori
inner casing, and auxiliary air moving means on said shaft
axial, air inlet passage 16. A cylindrical inlet duct 17
extends around the inlet end of the passage 15. The cas
3,069,071
4
3
between said one end wall and said back plate for draw
ing air through said last mentioned passage into said inner
casing, over said bearing and through said clearance
opening, and for discharging said air into the space be
into said rotor, an inner casing having a cylindrical por
tion downstream with respect to gas flow through said
fan of said back plate and concentric with said back plate,
means including a shaft on the axis of said casing within
said casing ‘for rotating said rotor, a bearing in said cas‘
tween said inner and outer casings.
ing around said shaft, said casing having one end wall
2. A ‘fan comprising a centrifugal rotor having a circu
adjacent to and parallel to said back plate but spaced
lar back plate, means forming an axial gas inlet passage
therefrom, said wall having a central clearance opening
into said rotor, an inner casing having a cylindrical por
around said shaft, the opposite end wall of said casing
tion downstream with respect to gas flow through said
fan of said back plate and adjacent to and concentric with 10 being closed, an outer casing having a cylindrical por
tion around, spaced ‘from and concentric with said cylin
said back plate, a shaft on the axis of said casing within
drical portion of said inner casing and said rotor, means
said casing connected at one end to said rotor, a bearing
extending through the downstream portion of said outer
in said casing around said shaft, a pulley in said casing
easing into said inner casing and providing an air passage
on the other end of said shaft, said casing having one
end Wall adjacent to and parallel to said back plate but 15 from the atmosphere around said outer easing into said
inner casing, and auxiliary air moving means on said shaft
spaced therefrom, said wall having a central clearance
for drawing air through said last mentioned passage into
opening around said shaft, the opposite end wall of said
said inner casing, over said bearing and through said
casing being closed, an outer casing having a cylindrical
clearance opening into the space between said inner and
portion around and spaced from and concentric with said
inner casing and said rotor, a hollow [fairing extending 20 outer casings.
through the downstream end portion of said outer easing
References Cited in the ?le of this patent
into the downstream portion of said inner casing in align
ment ‘with said pulley, an electric motor on said outer
UNITED STATES PATENTS
casing having a pulley aligned with said pulley, a belt
around said pulleys and extending through said fairing, 25
and auxiliary fan means on said shaft between said one
Wall and said back plate for drawing air through said
fairing into said inner casing, over said bearing ‘and
through said clearance opening, and for discharging said
air into the space between said inner and outer casings. 30
3. A ‘fan comprising a centrifugal rotor having a circu
lar back plate, means forming an axial gas inlet passage
2,093,748
Becker ______________ __ Sept. 21, 1937
2,187,164
2,245,989
2,309,583
2,335,508
Leathers _____________ __ Jan.
Leathers ____________ __ June
Frantz ______________ -_ Jan.
Gustafsson et al _______ __ Nov.
16,
17,
26,
30,
1940
1941
1943
1943
FOREIGN PATENTS
1,031,705
France ______________ __ Mar. 25, 1953
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