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Патент USA US2136688

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Nov. 15, 1938.
Filed April 2, 1936
30’ 33 34
Patented Nov. 15, 1938
George E. Houghton, Cedar Rapids, Iowa
Application April 2, 1936, Serial No. 72,323
2 Claims. (Cl. 110-104)
This invention relates to‘ fuel feeding devices for positively controlling the amount of fuel fed
and has particular relation to devices for feeding
pulverized fuel into a furnace for combustion -
Many automatic fuel feeding devices of this
character, adapted for use with small heating
plants and the like, employ liquid fuel'such as
various grades of oil. The devices employing
\ liquid fuel are satisfactory in operation but it is
10 a well known fact that the cost of the liquid fuel
per heat unit is much greater than the cost of
coal per heat unit. It is accordingly of substan
tial economical advantage to use coal in the ?ring
of ‘a heating plant.‘
There have been, consequently, various meth
ods and devices employed to provide for the auto
matic feeding of coal to a furnace. These devices
comprise stokers andpulverized coal burners and
the like. However, stoking devices do not readily
20 lend themselves to quick and positive control of
combustion of the fuel in a furnace. In addi
tion the residue of combustion in a stoker ?red
furnace usually takes the form of clinkers which
are diflicult to remove from the ?re box.
The use of pulverized coal does away with
many‘ of these di?iculties encountered in the use
of stokers and approaches liquid fuel in ease of
handling and in other advantages with the added
advantage of lower fuel cost as compared to
30 liquid fuels.
into a heating plant.
A further object of my invention is to provide a
pulverized fuel feeding mechanism which will
insure the fuel being suspended in air in ?nely ‘5
divided particles.
According to my invention I provide a device
that comprises a mechanism for withdrawing
pulverized fuel from a hopper in fixed measur
able quantities. The fuel is then led into a sys- l0
tem of blowers and from there directed into the
fire box of a. furnace where it is burned. An
electric motor is employed to actuate the various
mechanisms of the device.
The novel features that I consider character- {15
istic of my device are set forth with particularity
in the appended claims. The invention itself,
however, both as to its organization and its
method of operation together with additional
objects and advantages thereof, will best be un- 20
derstood from the following description of a
specific embodiment of the invention when read
in connection with the accompanying drawing,
in which:
Figure l is a view in side elevation and as- ,25
sembled relation of a device constructed in ac
cordance with the principles of my invention.
Various parts are broken away to better illustrate
the device.
Devices adapted to feed pulverized coal con
structed according to the teachings of the prior
‘Figure 2 is a top sectional view, taken along '30
line II of Figure 1, of a paddle mechanism em
ployed in my device for distributing the fuel into
art and with which I am familiar, have had cer
the rest of the device.
tain defects. In the ?rst place many of. the de
35 vices were designed primarily to be used with
large furnaces and were consequently intricate
and expensive and not applicable to the small
heating plant. Others designed‘ for use with
small heating plants were unsatisfactory in many
ways. Some did not provide for proper metering
Figure 3 is a detailed view in side elevation of
the mechanism for controlling the amount of ,35
pulverized fuel fed into the blower of the device.
Figure 4 is a detailed perspective view on larger
scale of the gate-like device of the fuel discharg
ing mechanism.
The device shown, in Figure 1 comprises a 40
. of the fuel and so did not provide for positive
motor or actuating means Ill and a fuel feeding
action for controlling the combustion of the fuel.
In others proper provision was not madefor in
suring that the pulverized fuel be ?nely divided
45 before being injected into the fuel box of the fur
assembly indicated generally at H. The motor
Ill and assembly l l. are mounted in close cooper
It is accordingly an object of my invention to
provide a simple, compact and comparatively in
. expensive device for feeding pulverized fuel into
50 a furnace.
Another object of my invention is to provide a
v pulverized fuel feeding device in which the feed
ing action is positive.
Another object of my invention is to provide a
55 control means in a pulverized fuel feeding device
ative relationship on a base l2.
A housing l3 is secured on the base l2 and 45
the housing is designed to furnish bearing sup
ports for a drive shaft M having a worm‘ l6
integral therewith. The shaft is adapted to be
driven by the motorv l3 through the agency of a
universal joint I5.
A second housing and supporting member I‘! is
secured to the upper face of the housing 53. The
upper portion of the support ll comprises a cas~
ing 18 which serves to house a fuel distributing
device as hereinafter described.
The center of the support I1 comprises a bush
ing like member 2I which serves to enclose and to
act as a bearing support for a shaft 22, indicated
by dotted lines. The shaft 22 has a worm gear 20
at its lower end which is adapted to be driven
by the worm IE on the shaft I4. A circular disk
23, illustrated in Figure 2, is suitably mounted on
the upper extremity of the shaft 22 for rotation
therewith. The disk 23 has paddle-like mem
10 bers 24 on its periphery and integral therewith.
The paddle members 24 are set at an angle with
the vertical axis of the disk 23 and serve as fuel
distributing and metering means as hereinafter
A hopper 26 is provided and this hopper is
mounted on and directly above the casing IS in
which disk 23 is located. The topper is an in
tegral part of a fuel supply bin which provides a
supply of pulverized fuel immediately accessible
20 to‘the distributing mechanism of the device.
The bottom of the hopper 26 is arranged with
an opening therethrough (not shown). This
opening corresponds in dimensions and location
with the space enclosed between the paddles ‘24
25 on the periphery of the disk 23.
As the disk rotates with the shaft 22 the pad
dles 24 sweep by the above-mentioned opening
and receive a de?nite amount of fuel from the
hopper‘ 26. The fuel is retained between the
30 paddles 24 by the casing I8 and is swept by the
paddles to an opening 21 in the lower face of the
casing I8. At this point the charges of fuel
carried between adjacent paddles 24 are dis
charged into the blower mechanism, the action
of the paddles pressing a certain amount of
fuel into the-blower mechanism each time a pad
dle passes over the opening 21.
Adjacent the opening 21 and immediately there
below is a mechanism for controlling the amount
40 of fuel discharged from the distributing disk
23 through the opening 21. This mechanism,
better illustrated in Figures 3 and 4, comprises a
gate-like device having cooperating plates 28
and 29. The plate 29, curved upwardly at the
45 inner extremity as indicated at 3|, is secured in
?xed relationship immediately below the opening
21 with the ear 3| extending within the opening
and immediately adjacent one side thereof. The
other plate 28 is designed to work cooperatively
'50 with plate 29 to permit increasing or decreasing
the extent of the discharge opening and thus
to regulate the amount of fuel passing there
through. The plate 28 is slidably secured be
neath the opening 21 at one portion and in a
hanger 30 on the under surface of easing I8 and
has an ear 32 at one extremity adapted to be
closely engaged with ear 3| on plate 29. The
other extremity of the plate is also formed in a
lip 33 immediately adjacent the hanger 30 and a
60 set screw 34 engages the lip 33 and is threadedly
inserted in the hanger 3!]. Obviously, rotation
of the screw 34 provides for adjustment of the
plate 28 to bring the plate 28 in close engagement
with plate 29 or to space the plates apart‘. The
mechanism thus described provides an efficient
means for controlling the flow of pulverized fuel
into the blower mechanism hereinafter described.
Immediately below the gate and continuous
therewith is a passage 36 forming a connection
between the fuel distributing or metering mech
anism and a housing 31.
The housing 31 is secured with and adjacent to
housing I3 and is also secured to base I2.
housing 31 serves to enclose a fan 38 which is
mounted on a portion of the through shaft I4
extending beyond the housing I3.
This fan 33
may be termed an auxiliary fan as it serves to
feed the main blower fan indicated at 39.
The main fan or blower 39 is also mounted on
the shaft I4 at the outer extremity thereof. The
main blower fan 39 is enclosed in a casing M
which is secured to the outer face of the housing
31. A portion of the casing M is formed to
provide a blower outlet indicated at 42. This
outlet is adapted to communicate with the ?re 10
box of a furnace. The casing may be secured on
the housing 31 in several positions, preferably
five, to enable the blower outlet to be located in
as many positions. This is accomplished by spac
ing the bolts by which the blower casing is se
cured to the housing at equal intervals about
the periphery of the joint between these parts.
The blower outlet may then be directed in any
of ?ve directions to thus provide a flexible ar
rangement for use with different type furnaces.
The auxiliary fan 38 has comparatively few
blades and in the particular embodiment here
shown comprises a four bladed fan. The main
or blower fan 39 has a larger number of blades
than the auxiliary fan 33, so arranged that the
blades will not be in synchronous relation with
the blades of the auxiliary fan. This arrange
ment insures that the pulverized fuel will be
divided into ?ne particles well mixed with or sus
pended in air before injection into the ?re box of
the furnace thus assuring a proper combustible
The operation of the above described device
may be set forth as follows. The motor 13 is en
gaged on base I2 in the usual manner and 35
sets the rotating mechanism in operation through
the agency of the universal joint I5 and the drive
shaft l4. The worm IS on the drive shaft actu
ates the shaft 22 and in turn the fuel distributing
disk 23 and paddles 24. The paddles 24 serve to 40
meter the pulverized fuel fan hopper 26 with the
blower mechanism of the device. The amount
of fuel discharged into the blower mechanism
may be regulated by the control gate formed by
plates 28 and 29. This adjustment permits regu
lation of the rate of combustion in the ?re box
of the furnace.
The fuel is fed from the distributing device
23 through the air entering the furnace in the
auxiliary fan 38 which is actuated by the shaft
I4. The pulverized fuel is then discharged from
the auxiliary fan through the main fan or blower
39 from which it is discharged into the furnace
through outlet 42. The use of the auxiliary fan
in addition to the main fan insures that the I"
fuel will be mixed into the air entering the fur—
nace in ?ne particles.
It is obvious that the fuel feeding device here
described is simple and positive in action and
will thus insure good results in the use of pul
verized fuel for all types of heating plants and
the like.
Although I have shown and described a cer
tain speci?c embodiment of my invention, I am
fully aware that many modi?cations thereof are i
My invention, therefore, is not to be
restricted except insofar as is necessitated by
the prior art and the spirit of the appended
' possible.
I claim as my invention:
1. In a device for feeding pulverized fuel into
a furnace, a hopper for retaining a fuel supply,
a housing below the hopper, a fuel distributing
disk enclosed in the housing and having paddles
at the periphery thereof adapted to take fuel from -T Ci
the hopper, a blower mechanism, means for con
trolling the discharge of the fuel from the dis‘
tributing disk and housing into said blower mech
anism comprising a gate-like device having a
?xed plate curved upwardly at its inner extremity,
and a movable plate slidably secured with rela
tion to the ?xed plate, a hanger for supporting
the movable plate, the ?xed and movable plates
having ears on adjacent ends of the plates, said
ears being curved upwardly toward each other
with one ear higher than the other, aforesaid
blower mechanism comprising an auxiliary fan
and a main fan, and means for actuating the fuel
distributing disk and the blower mechanism com
if) prising a motor, a shaft adapted to be driven by
the motor and having a worm integral therewith
and the said shaft also having the main fan and
the auxiliary fan mounted thereon, and a sec
ond shaft having the fuel distributing disk‘ mount
ed thereon and adapt-ed to be driven by the ?rst
named shaft through the agency of the worm
integral therewith, and a worm gear secured to
the second named shaft.
2. In a pulverizing fuel feeding device, a fuel
distributing and metering means comprising ‘a
disk having paddle-like members about the pe
riphery thereof, a housing in which the disk is
housed, the housing having an opening in the
bottom thereof, below the paddles in an arc of
their movement, a gate-like means for controlling
the ?ow of fuel from the disk and including 5
a plate having an upwardly curved ear at the
inner extremity thereof and with the ear extend
ing into the opening and immediately adjacent
thereof, a second plate adapted to work co-opera
tively with the ?rst named plate to permit in
creasing and decreasing at the extent of the dis
charge opening, the second plate being slidably
secured beneath the opening and a hanger for
supporting the second named plate, the inner
end of the second named plate having an up 15
wardly curved ear disposed in opposed relation to
the ear on the ?rst named plate, and the ears
being arranged with one higher than the other
to positively scrape fuel from beneath the pad
dles and discharge it through the opening, and 20
a blower for discharging fuel from the fuel dis
tributing means into the ?re box of the furnace
and means for actuating the fuel distributing
means and the blower means.
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