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Патент USA US2130146

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Sept. 13, 1938..
'
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G.
W..MCKEEl
'
2,130,146
CENTRIFUGAL BLOWER ROTOR
Filed Oct. 20, 1957
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wir@
Patented Sept. 13, 1938
UNITED STATES PATENT OFFlE
2,130,146'
CENTRIFUGAL BLOWER ROTOR
Garnet W. McKee, Rockford, Ill.
Application October 20, 1937, Serial No. 169,971
5 Claims. (Cl. 230--134)
The present invention relates generally to blade sideration which is especially adapted or designed
for- use in connection with a small high speed
equipped rotors. More particularly the inven
tion relates to that type of rotor which together blower and may be produced at a lower cost than
With a conventional surrounding casing having that which forms the subject matter of an appli
cation for United States Letters patent filed by ci
ñ an inlet opening in the side thereof and a pe
ripheral outlet forms a centrifugal blower, con
sists of a cylindrical hub with a shaft opening
therethrough and an annular series or set of equi
distantly spaced radial plate metal blades around
the hub, and is adapted for high speed drive and
Other objects of the invention and the various
advantages and characteristics of the present
blade equipped rotor will be apparent from a
consideration of the following detailed descrip
to draw gas or air at either normal or high tem
tion.
perature through the inlet opening in the side of
The invention consists in the several novel
features which are hereinafter set forth and are
more particularly defined by claims at the con
15
clusion hereof.
VIn the drawing which accompanies and forms
a part of this specification or disclosure and in
which like numerals of reference denote corre
the casing and to discharge the gas or air under
pressure from the casing via the peripheral out
let thereof.
Y
One object of the invention is to provide a rotor
of this type which is an improvement upon and
embodies certain inherent advantages over pre
viously designed rotors of the same general de
l25
of the speed of rotation or the temperature to
which they are subjected they maintain the
tively prevent the setting up of strains or stresses
30 which would cause vibration and resultant crys
tallization of parts.
Another object of the invention is to provide
a blade-equipped rotor of the type under con
sideration in which the baldes are formed or
3
01 arranged in pairs and each pair of blades is in
the form of a one piece stamping and embodies
a hub-engaging cross piece which extends between
the inner or root portions of the blades and is
joined to such portions by uniformly rounded or
40
'
sponding parts throughout the several views:
Figure 1 is a transverse sectional View of a
sign and for the same purpose and is char
acterized by the fact that the blades thereof are- centrifugal blow-er rotor embodying the invention,
illustrating in detail the arrangement and design
so arranged and anchored that they are free dur
ing drive of the rotor to swing or move into truly Aof the equidistantly spaced radial plate metal
radial relation with the hub in response to the blades and the manner in which the blades are
_action of centrifugal force and hence regardless held in anchored or connected relation with the
rotor as a whole in balanced relation and effec
'
me of even date herewith Serial No. 169,970.
curved bends.
'
A further object of the invention is to provide
a centrifugal blower rotor of the type and char
acter last mentioned in which the cross pieces
between the inner or root portions of the pairs
45 of blades are curved conformably to the outer
periphery of the hub and the latter embodies out
wardly extending annular members at its ends
and also longitudinally extending pins which ex
tend between and are connected to the members
50 and ñt within the bends between the cross pieces
and the root portions of the blades in such man
ner that they serve to hold the blades in connected
relation with the hub.
A still further object of the invention is to pro
55 vide a blade-equipped rotor of the type under con
hub;
Figure 2 is a longitudinal sectional view taken
on the line 2_2 of Figure 1 and showing the
design and construction of the hub of the rotor
and also the manner in which the pins are car- u
ried by the outwardly extending annular members
at the ends of the hub; and
Figure 3 is a perspective of one of the unit type
pairs of blades around the hub of the rotor.
The rotor which is shown in the drawing con- .
stîtutes the preferred embodiment of the inven
tion. «It is designed in connection with a con
ventional or standard casing (not shown) hav
ing an inlet opening in the side thereof >and a
peripheral outlet to form a centrifugal blower
and is adapted to be driven at a comparatively
high speed and to draw gas or air at either
normal or high temperature inwardly through
the inlet opening in the side of the casing and to
discharge the gas or air under> pressure via the
peripheral outlet. As its main parts the rotor
comprises a substantially'cylindrical hub 4 and
an annular series or set of blades 5 around the
hub.
‘
'
The hub 4 is formed of steel or any suitable
alloy and has a centrally disposed longitudinally
Iextending opening 6 therethrough. This opening
is adapted to receive a drive shaft (not shown)
and is machined or formed so that it is truly con
centric With respect tothe outer periphery of the
,
2
2,130,146
I3 are free to swing or move into truly radial rela
tion with the hub in response to the action of
hub. 'I‘he hub is adapted to be keyed or otherwise
ñxedly secured to the drive shaft and embodies
a pair of outwardly extending annular members
‘I and an annular series of longitudinally extend
ing pins 8. The members 'I are in the form of
integral annular flanges at the ends of the hub
centrifugal force during high speed drive of the
rotor and hence regardless of the rotational speed
and are each provided with an annular series or
whole or set up any strains or stresses which
would result in vibration and cause crystallization
set of circular holes 9. As shown in Figure 2 the
holes 9 in one outwardly extending annular mem
ber -I correspond in number to and are yaligned
with the holes in the other member. The pins 8
are formed of steel or any other suitable mate
rial and are slightly longer than the hub 4. They
are externally positioned with respect .to thehub
and serve as hereinafter described, to hold the
blades 5 in connected or anchored relation With
the hub. The ends of the pins extend through
the holes 9 in the members 'I and have enlarged
polygonal heads I0 in engagement with the inner
face of one member and cotter pins I I in opposed
relation with the outer face of the other member
and serving with the heads to hold the- pins
against axial displacement with respect to the
hub.
The blades 5 are formed of plate metal or llike
comparatively stiff material and are of uniform
thickness throughout. They are spaced equi
distantly apart and extend radially from the
outer periphery of the hub 4. The outer and
Til) central portions 'of the blades are flat and operate
thereof or the temperature to which they are
submitted they do not unbalance the rotor as a -
of parts. During starting of the rotor the blades
due to their inertia tend to tilt rearwardly. Such l()
action does not, however, impose any strain or
stress upon the cross pieces I 2 between the inner
or root ends of the blades for the reason that the
tendency of the leading blades of the pairs to
urge inwards the front or leading portions of the
cross pieces is counteracted by the tendency of
the trailing blades of the pairs to move the trail
ing portions of the cross pieces away from the
hub.
'
.
The rotor is assembled by first arranging the
blades‘5 Yin radial relation with the hub so that
the integral connecting cross pieces I2 abut
against the outer periphery of the hub and the
bends I3 are disposed in registering relation with
the holes 'I in the outwardly extending annular 25
members 9 at the ends of the hub. Thereafter
the screws I4 are ‘inserted through the central
portions of the cross-pieces I2 and into threaded
engagement with the internally threaded sockets
i5. At ythe conclusion of this step or operation 30
during drive of the rotor to impel and Aplace under
the pins 8 are brought into their proper position
pressure the .gas or air which is sucked or drawn
by driving them through the holes 9 and into
seated relation with the outer curved faces of
inwardly through the inlet opening in the side
of the casing with which the rotor is associated.
As shown in Figures 1 and 3 the blades are formed
or arranged in pairs and each pair of blades is in
the form of a one-piece stamping and embodies
a hub engaging cross piece I2 which extends be
tween the inner or root portions ofthe blades and
is joined to such portions by uniformly rounded
or curved integral bends I3. The cross pieces I2
are curved or bent conformably to the outer pe
riphery of the hub 4. The bends I3 and the cross
pieces are of the same width as the blades and
fit directly against said outer periphery of the
hub. The pins 8 correspond in number to -the
blades 5 and are arranged so that there are two
of them for each pair of integrally formed unit
type blades. They ñt within the yuniformly
rounded- or curved Abends I3 ‘between the cross
pieces I2 and the inner or root ‘portions o‘f the
blades and are spaced from the outer periphery
of the hub a distance equal to the thickness of
the bends with the result that they serve to hold
the latter together with the cross pieces in' abut
ting and angular relation with the hub. By rea
son of the fact that the bends extend around the
outer side portions of the pins the blades or cross
pieces are held against circumferential movement
with respect to the hub. The outer faces of the
bends are curve-d conformably to the periphery
of the pins and hence there is no looseness be
tween the bends and the pins. The side edges of
the inner or root portions of the blades abut
against the inner faces of the outwardly extend
ing annular members "I at the ends of vthe vhub
with the result that the blades are held against
longitudinal movement relatively to the hub.
Screws I4 extend through the central portions
of the cross pieces I2 into internally threaded
radially extending sockets I5 in the hub and
serve additionally to hold the blades and-cross
pieces in place. The blades in View of the spe
ciñc manner in which they are connected or an
chored to the hub by the pins 8 and the bends
the bends I3.
'
_
The herein described centrifugal blower rotor
due to the `design and arrangement of the blades
maintains automatically its proper balance re
gardless of rotational speed or the temperature to
which it is subjected. It has special utility in
connection with a high speed blower for hot gas
or air and may be manufactured at a low and
reasonable cost since it consists of but a small
number of parts. Due to the general design and
arrangement of parts the rotor may be balanced
tc a nicety and contemplates true radial rela
tionship of the blades with respect to the hub at
all times.
The invention is not to be restricted to the spe
cific details set forth, since these may be modiñed
within the scope of the appended claims, without "50
departing from the spirit and scope of the inven
tion.
`
Having thus described the invention, what I
claim as new and desire to secure by `Letters
Patent is:
:55
l.. A centrifugal blower `rotor comprising a hub
adapted to be connected to and driven by a shaft
and having outwardly extending members at
its ends, pairs of radially extending blades yar
ranged in an annular series around the hub and i60
each embodying a hub engaging cross piece be
tween and connected by bends to the inner or
root portions of the blades thereof, and pins ex
tending between and carried by said members
and arranged so that they ñt in the 'bends .65
respectively and serve to hold the cross pieces in
place against the hub.
2. A centrifugal blower rotor comprising a hub
adapted to be connected to and driven by a
shaft and having outwardly extending members 70
at its ends, pairs of radially extending blades
arranged in an annular series around the hub
and each embodying a hub engaging cross piece
between and connected by uniformly rounded
hub engaging bends to the inner or root portions
3
2,130,146
of the blades thereof, and cylindrical pins ex
ends, substantially equidistantly spaced blades'
tending parallel to and spaced slightly outwardly
extending radially outwards from the hub and
of the hub and having their ends extending
through holes in said members and their central
having cross pieces at the inner ends thereof to
gether with uniformly rounded bends between
them and said cross pieces, and means for secur
ing said cross pieces in attached relation with
the hub comprising individually removable cy
portions thereof fitting in the bends respectively
and serving to hold the cross pieces in place
against the hub.
3. A centrifugal blower rotor comprising a
cylindrical hub adapted to be connected to and
driven by a shaft and having outwardly extend
ing annular members at the ends thereof, equi
distantly spaced pairs of radially extending blades
arranged in an annular series around the hub
and each embodying a cross piece curved con
formably to and ñtting against the outer periph
ery of the hub and extending between and con
nected by integral uniformly rounded bends to
the inner or root portions of the blades thereof,
and means for holding the cross-pieces in place
against the hub consisting of screws extending
through the central portions of the cross-pieces
and into the hub and removable cylindrical pins
extending parallel to and spaced slightly out
wardly of the hub and having their ends extend
ing through holes in said members and the cen
tral portions thereof fitting in the bends respec
tively.
4. A centrifugal blower rotor comprising a hub
adapted to be connected to and driven by a shaft
and having outwardly extending members at its
lindrical pins extending parallel to and spaced
slightly outwardly of the hub and having the
ends thereof extending through aligned holes in 10
said members the central portions thereof fitting
in the bends respectively.
5. A centrifugal blower rotor comprising a cy
lindrical hub adapted to be connected to and
driven by a shaft and having outwardly extend 15
ing annular members at its ends, substantially
equidistantly spaced blades extending radially
outwards from the hub and having cross pieces
at the inner ends thereof ñtting against and
curved conformably to the outer periphery of 20
the hub and joined to said inner ends of the
blades by uniformly rounded or curved bends,
and means for securing said cross pieces in
place against the hub comprising removable cy
lindrical pins extending Vparallel to and spaced 25
slightly outwardly of the hub and having the
ends thereof extending through aligned holes in
said members and the central portions thereof
fitting in the bends respectively.
GARNET W. MCKEE.
30
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