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Патент USA US2130910

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‘1 ‘Sept. 20, 1938.
Filed Feb. 9, 1935
3' Sheets-Sheet l
4_ :v_ _
Sept. 20, 1938.
v 2,130,910
Filed Feb. 9,» 1935
3, Sheets-Sheet 2
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Sept. 20, 1938.
Filed Feb. 9, 19:55
3 Sheets-Sheet 3
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Application February 9, 1”}, Serial No. 5,691
2 Claims. . (cl. sat-m)
tion II of the ?ange 22. A bladed fan 28 is
This invention relates to fans, and more partic
' ularly to‘ ventilating fans.v
received over the projection ll of the hub i4, and
- ' The object of the invention is to increasethe v is fixedto the ?ange 22 by any suitable means
. emciency, and to decrease the manufacturing cost
such as the rivets 2L
5 of ventilating fans by the use of certain novel
constructional features hereinafter more fully de
The blades of the fan 20 are designed-to de- 5
liver air uniformly across their working length.
The peripheral velocity of the portions of the
' Accordingto a preferred embodiment of the in
blade closer to the hub is less than the peripheral
vention, a Venturi-shaped air intake ring formed velocity of points more distantly removed from
' 10 in ‘a unique manner is employed to'produce the hub. It is therefore necessary to progres 10
smooth air?ow past a novel fan designed to pro
sively increase either the angle of incidence or
duce uniform air?ow over its entire working area. / the effective width of the blade as the hub is ap
Other important features of the invention re
proached in order to deliver a uniform quantity
side in the novel means employed to fix the driv
of air: ,It has been found that better results can
1‘ ing motor to the air intake ring, and to the con
be accomplished by progressively increasing both
\ nection between the fan and the driving. shaft of [the effective width, and-the angle of incidence of ,
the motor.
_ the blade as the peripheral velocity of the blade
Other'important' features of the invention will" decreases as the hub is approached. In view of
be apparent from the followingdetailed descrip ‘the fact that the peripheral velocity of the por20 tion together ‘with the accompanying drawings
tions of the blade adjacent to the hub, commonly
calledrthe root of the blade, is very low, it has
been found impractical to attempt to employ this
submitted for purposes of illustration only, and
not intended to de?ne the scope of the invention,
reference being had for that purpose to the sub
section of the blade to drive air.
The portion of the blade having the highest
In the drawings, wh’erein similar reference ‘angle of incidence is the portion of the working 25
\ characters refer to similar parts throughout the length closest to the hub. The root of the blade
J'oined claims.
_ must be su?lciently strong to withstand consid
Figure 1 is a front elevation of_ a fan embody
erable bending in order that'the section of the
working length of the blade closest to the hub
30 Figure 2 is a side'elevati‘on, partly‘ in section. can be carried at the necessary high angle of 80
ofthefanshowninlligure 1;
incidence. The root section of the blade is there
'Figure 3 is a side elevation partly in section, of fore made of uniform cross section in order to
" the hub employed to fix, the fan‘ to the driving produce uniform torsional strength so.that the
blade maybe easily bent or formed to the high
35 Figure} isa front elevation similar toFig'm-e 1 angles necessary at the beginning of the working
ing the present invention:
but showing a‘ different embodiment of the in
. - Figure 51s a side elevation of the fan shown in
Figure. 3;
Figure 6 isa rear elevation, similar to Figure 3,
but showing a different embodiment of ,the in
section, without danger of overstressing the ma
‘The fan 28 is surrounded by a Venturi-shaped
air intake ring 30 designed to produce smooth air
?ow and to prevent eddies in the air before it is 40
acted upon by the propeller 28.
The ring it is formed in a novel manner by
t Figure 'l is a side elevation of. the fan shown in
butt-welding a strip of material to form a hollow
cylinder of proper diameter to form the desired
Flgure 8,is an enlarged view, taken on. the line , ring, The cylinder is then passed between a pair 45
. Figure 6; and
Referring to the drawings, andmore particularly to Figure 1, there is shown a ventilating fan
having a driving motor [I and a driving shaft I2.
50 A hub is having two sections of reduced‘ outer
diameter l6 and i8 is ?xed to the driving shaft l2
by any suitable means such as the ‘screws 20. A
?ange 22 is received over the section, II of the
hub-l4. and is ?xed.) thereto by shear-riveting a
' 166 portion of‘the section it into a countersunk sec
. of rolls‘ which deform it to give it ‘the proper
‘ Venturi shape. The cylinder is then removed
' from~the forming rolls and placed in a squeezer.
The squeezer is so designed as to place equal pres
v sure on all points about the periphery of the cyl- 50
inder. The squeezing operation is continued‘ un
til the material of the cylinder is stressed beyond
‘in elastic limit, and when so stressed it will re
tain its shape permanently. '
Two Venturi-shaped rings may be formed to- 55
gether channel-shaped and then split to separate
members 38. The members 38 may if desired
them after the squeezing operation, or one may be
formed at a time, as desired. The rings may be
formed of any desired material such as aluminum
formedlof a single strip. bent to form a triangle
having ?at ‘apexes suitable to be welded to ‘the
support struts 32. In this embodiment the rein
or steel.
forcing members 38 form the'counterpart of the
Hi to the ring 30. Motor support struts 32 formed
motor retaining ring 33.
‘The design of the fan is such that the ma
of seamless tubing or rectangular strip metal‘of
jority of the Joints may if desired be spot welded,
Means are provided to ?x, the driving motor
very thin cross section, (having the dimension
10 parallel to air ?ow many times greater than the
dimension perpendicular to air ?ow) are spot
-weided to a retaining ring 33, ?xed tothe driv
ing motor ill by the screws 35, and extend to
the ring 30. The motor support struts 32 are
15 preferably spot-welded to a T-shaped member
although other means may be employedto ?x
the members together.
Although the invention has been described with .
particular reference to certain speci?c embodi
ments,’ it is not intended to limit the scope of the
invention to the embodiments shown, nor other
wise than by the terms of the following claims.
34 ?xed to the ring 30 in any suitable manner, as
by rivets 36. The support struts 32 are so pro
portioned that the dimension parallel to air ?ow
is many times greater than the dimension per
20 pendicular to air ?ow.
In the smaller type fans illustrated in Figures
1 and 2, four motor support struts arranged as
shown in Figure 1 may be sufficient to support the
driving motor l0 and the fan 26. In the larger
25 types of fans it has been found desirable to em
ploy six motor support struts 32 arranged as
shown in Figure 4.
_ To support ‘the largest types of fans it has been
found advisable to use a triangulated structure
30 as shown in Figure 6. In this structure the motor
support struts 32 welded to the T-shaped mem
bers. 34 form a‘ triangular-shaped framework
across‘ the ring 30.‘
Reinforcing members 38
strengthen the framework and form a support to _
which the feet 40 of the motor in maybe fas
I .1. A ventilating fan comprising a driving motor
including a shaft and a housing, a bladed fan
having a working area designed to deliver air at _
uniform velocity, a generally conical shaped air 20
?ow directing ring and an an outlet passage of
substantially the same diameter as the fan, and
means including a plurality of thin relatively wide
brace members ?xed to the ?anged section of the ,
air ?ow directing ring and extending across said 25
ring to form a generally triangular shaped frame
work to receive the housing of the‘v’driving motor
to hold‘ the ends of the. blades of the fan adja
cent and rearwardly of the section of the ring
of substantially the same diameter as the fan.
2. In a ventilating fan, a ‘driving motor includ,
ing a housing and a driving shaft, a hub ?xed to
the driving shaft, a flange riveted to the hub, a
bladed fan ?xed to the ?ange, said blades having
working sections designed to deliver air at uni 35
tened by any suitable means, such'as the bolts form velocity over the working area of said blades
42. If desired' resilient washers 44 formed of and a root section of uniform cross section to
resist the concentration of bending stresses derubber or other sultable'material may be inter
posed between the feet'40 of the motor and the veloped in the fan, a Venturi-shaped ring sur
rounding the. fan, and means including thin rel 40
40 motor support, to damp out vibration.
In the devices shown in Figures 1-5 the thrust atively long supports extending across the Ven
and torque of the fan 23 are transmitted through turi-shaped ring ?xed to the housing of the driv
the motor retaining ring 33 to the motor support ing motor to hold the outer ends of the fan blades
adjacent the restricted section of the Venturi
struts 32.
In the device shown in Figures 6 and 7 the shaped ring. '
thrust and torque of the fan 26 are transmitted
through the feet 40 bolted to the reinforcing
' MARSHALL a 5mm, JR.
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