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Патент USA US2130329

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sept. 13,l 193s.
Filed May 6, 1935
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22 _
./N//EA/ TER
Patented Sept. 13, 1938
Edward C. Sammons, Portland, Oreg., assignor
to Iron Fireman Manufacturing Company,
Portland, Oreg.
Application May 6, 1935, Serial No. 20,063
4 Claims. (e1. 11o-_104) '
This invention relates generally to coal burn
into which projects the nozzle |8, which is
ing stokers and particularly to stok'ers of the mounted on the pivot bolts I9 on the arcuate por
overfeed type.
tion 20 of the nozzle holder 2|, which is secured
to the front I2 by means of the bolts 22.. The
a new form of overfeed Stoker in which fuel is portion 20 forms a part of a cylinder and has 5
pneumatically fed from a remote storage point an opening 23 formed therein through which fuel
into a furnace and runiformly distributed over thev can enter the nozzle I8. The nozzle holder 2|
entire grate surface.
is provided with a flanged end 24, which is con
The second object is to construct the Stoker nected to a tube 25 forming a part of the pneu
10 so that it may be operated satisfactorily without matic conveyor. It is not necessary that the noz- 10
regard to the kind of fuel being used, or the pro
zle I8 fit closely to the curved portion 20 since
portions of the various sizes and regardless of the air is actually drawn into the nozzle I8 through
moisture content of the coal and the rate of burn
the clearance space it is desirableto provide at
v ing, as well .as the particular type of furnace this point.
The main object of this invention is- to provide
i0 with which the stoker is used.
The third object is to tilt the discharge nozzle
in a vertical plane for the purpose of varying
the trajectory of the fuel discharged therefrom
>in order to make it possible to deliver fuel to
every part of the grate surface, lateral distribu
tion being obtained mainly by the shape of the
nozzle, while longitudinal distribution may be
_varied and controlled by the elevation of the noz
zle itself, or by a rocking movement thereof, sep
25 arately or in combination with variations in the
velocity of the air stream.
The fourth object is to combine a mechanical
fuel feeder which will discharge fuel at approxi
» mately the level at which it is to enter a fur
30 nace, and to convey the discharged fuel pneu
matically to said furnace.
I accomplish these objects in the manner set
forth in the following specification as illustrated
-in the accompanying drawing, in which:
Fig. 1 is an elevation showing my device at
tached to a common form of furnace showing the
furnace Walls in vertical section.
Fig. 2 is a vertical section through the coal feed
Fig. 3 is a horizontal section taken along the
line 3-3 in' Fig. 4 showing the tiltable burner
nozzle in section.
Fig. 4 is a vertical section taken along the line
4-4 in Fig. 3.
Similar reference numerals refer to similar
parts throughout the several views.
Referring in detail to the drawing, there is
shown a common form of grate l0. A bridge
walll || extends across the rearward end of the
o0 grate Ill, and a furnace front I2 is indicated, with
a secondary air duct I3 projecting therethrough.
Air is supplied to the duct I3 by means of a fan
I4 which is driven from. a motor I5,v which also
rotates a crank shaft |6.
l'n the front I2 is formed a tapering recess I1
On the side of the nozzle holder- 2| is formed 1_5
a segment 26 provided with a series of holes 21
along an arc struck from the axis of the pivot
bolts I9.
The nozzle I8 has secured thereto an arm 28
which may be adjustably positioned with regard 20
to the segment 26 by means of the removable pin
29, which is preferably secured on a chain 30.
The arm 28 is attached at one of the holes 3|
in the connecting rod 32, which is connected to
a crank 33 on the crank shaft IB.
It will be 25
understood that the connecting pin 33A is made
easily removable.
Air is supplied to the tube 25 by means of a
fan 34 which is operated-by a motor 35, which
for the purpose of illustration, is shown as sepa- 30
rate from the motor 36, which drives the fuel
feeding worm 3l disposed within the worm cas
ing 38, which is connected to a transfer box 39
interposed between the tube 25 and the fan 34.
In the connecting pipe 40 between the fan 34 35
and the transfer box 39 is a damper 4|, which
is rocked by means of an arm 42 and the con
necting rod 43 from the crank 44, which is d_is
posed on the crank shaft I6.
It is desirable to provide the fan 34 with a form 40
of control similar to that shown in the Banfield
Patent No. 1,938,241, wherein the size of the fan
inlet is controlled by the position of an operating
lever which is referred to later as` a control
lever 45.
It is desirable to provide the >connections be
tween the crank 44 and the damper 4| with some
means for rendering the damper 4| inoperative,
preferably by means of a loose pin at either end
of the rod 43.
The operation of the Stoker is as follows:
Assuming'that the damper 4| is being rocked
and that the nozzle I8 is also being rocked
through the operation of the cranks 33 and 44,A
which means that fuel is sprayed upon the grates 65
I0, it is evident that not only is the trajectory
of the fuel stream varied in a manner to cause
it to discharge fuel along the entire length of the
grates I0, but there is also maintained a surging
cl action in the force of the conveying air which
brings about a complete and uniform distribution
>of the fuel over the entire surface of the grates IU.
It is also desirable to provide the fan 34 with
some form of damper control lever 45 so that it
10 will not only be possible to cause the air in the
tube 25 to surge, but that the quantity of air flow
ing therethrough can also be varied, giving there
by an almost unlimited control in the delivery
and distribution of the fuel by the nozzle I8.
It will, of course, be understood that the motor
36 and its intervening drive to the worm 31 in,
cludes a variable speed arrangement not shown.
These are in common use in stokers of all kinds,
and their purpose is to vary the rate of coal feed
20 mg.
It is desirable to make the nozzle I8 removable
and this may be accomplished in any convenient
manner, preferably by means of a flange IBA.
It is also desirable to provide openings 2 IA in the
nozzle holder 2| through which air may be drawn
for the protection of the nozzle itself.
I claim:
l. In an overfeed stoker for continuously feed
ing mixed ñne coal and lump coal to a furnace
30 grate, a laterally widened adjustable nozzle
mounted above the grate level and pivoted so as
to throw the lump coal on the grate through
different trajectories depending upon the angle
to which the nozzle is set, a motor driven Ian, a
pneumatic conveyor tube delivering air from said
fan to said nozzle, means for feeding mixed fine
and lump coal laterally into the air stream in the
pneumatic conveyor tube, thereby insuring the
mixture of the coal with the air, means for al
40 tering at will the quantity of the air delivered
by the fan, and automatic means for independ
ently causing a regularly timed, constant increasev
and decrease in the velocity of air delivered by
the fan, so that the lumps will be distributed over
. the entire grate surface.
2. In an overfeed stoker for a grate furnace, a
pneumatic fuel conveyor duct, a motor driven
fan for discharging air through said fuel conveyor
duct at a high velocity, a feed worm for feedingcoal into the high velocity air stream whereby the
rapidly moving air will convey the coal from the
point of discharge of the feed worm, a nozzle
at the end of the fuel conveyor duct for distribut
ing the lump coal on the grate and for discharg
ing the fines into the burning space above the 10
grate, an air duct for delivering air to a space
beneath the grate of the furnace, and a second
motor driven fan for discharging the main air
supply for combustion through said air duct, said
motor driven fans being entirely independent of 16
each other, whereby the ñrst fan may be of high
speed, high velocity type and the second fan may
be of low pressure type, and either air supply
may be changed in volume without affecting the
volume delivered by the other fan.
3. The device of claim 2 in which there is also
provided means for altering at will the quantity
of the air through the pneumatic conveyor duct
so that the coal will be discharged on a chosen
area of the grate.
4. In an overfeed stoker for a grate furnace, a
conveyor tube for feeding air, fine coal, and lump
coal to said furnace, a fan for discharging a con
tinuous stream of air at high velocity through
said tube, a nozzle at the end of said tube for dis
charging the lump coal to the grate and the fine
coal into the burning space above the grate, and
automatic means for constantly varying the ve
locity of the continuous high velocity air stream
so that the fuel is constantly fed but due to the
surging of the air stream the lumps of coal are
delivered to the far side of the grate when the
velocity is greatest and to the near side of the
grate when the velocity of the air stream is least, 40
whereby the constant change in the trajectories
of the lumps of coal will tend to insure a uniform
bed of coal on the grate.
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