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Патент USA US2116774

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May 1_0, 1938.
2,116,774
J.> H. WALTER
MECHANICAL ST‘OKER
Filed Nov. 25, 1932
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May 10, 1938,
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J. H. WALTER '
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2,1169774
MECHANICAL sToKER
A Filed Nov.. 2S, less
5 sheets-.sheet 2
May 10, 1938>.'
2,1 176,774
J. H. WALTER
ME‘òHANIcAL sToKER
Filed N'ov. 25, i932
È Sheets-»Sheet 3
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J. H. WALTER
MECHANICAL sToKER
Filed Nov. 25; 1952
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'5 Sheets-Sheet 4
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May 10,1938.
J. H. WALTER
2,116,774
MECHANICAL STOKER
FiledNov. 25, 110,32
Il:
a.
5 Sheets~$heet 5
Pnienied Mey 1o, 193s
» 2,116,174
' UNITED s'i‘iiTEsA PATENTl oEFiCE
MECHANICAL _STOKEE
Joseph Henry Walter, Springfield, Ohio, assignor,
by mesne assignments to The Steel Products
Engineering Company, Springfield, Ohio, a cor
poration of Ohio
Application November 25, 1932, Serial No. 644,247
-1Claim.
The present invention relates to improvements
in mechanical stokers.v
'
'
.
021e of the important objects of the invention
` is to provide a new and improved mechanical
5 s_toker of the underfeedtype having a burner re
tort in which air under pressure is supplied in
such a manner that the‘unburned fuel in the
bed is evenly distributed.
l
‘
`
closed, but intend to cover all modiñcations and
alternative constructions falling within the spirit
and scope of the invention as expressed in the
appended claims'.
e
Referring more `particularly to the drawings, 5
the specific stoker selected for illustration of the
invention is of the underfeed type, and comprises
in general a burner retort I0 opening upwardly
and adapted to be suitably located in a combus
tion chamber (not shown), a vertical hopper Il 10
. a burner retort with air and’fïelìîipply-«ducts~mmounted externally of the combustion chamber
oœning to one side and with air inlet openings and adapted Vto be supplied with the fuel to be relatively small in size and in aggregate area in burned, a fuel passage preferably in. the form of
a cylindrical duct I2 connecting the base of the
the side located adjacent the ducts and relative
i5 ly large in size and°in _aggregate area in the side hopper to the underside of the retort, and power- 15
. «WA more specific object is to provide a novel
m mechanical'stokerm?theeunderfeed type having
located remotely of the ducts', whereby increased
driven fuel feeding means, preferably in the
form of a rotary screw conveyor I3, for advanc~ '
combustion tends to occur in the region of the
last mentioned openings to compensate for any ing the fuel from the hopper through the duct v
into the retort as required. Air of combustion
excess distribution of fuel otherwise tendingo to under
pressure is adapted to be supplied to the
retort
through a conduit Il from any suitable
Further’ objects and advantages vwill become source,i0 such
for example las a power-driven
apparent as the description proceeds.
centrifugal blower I5. Ashes and other residual
In the accompanying drawings,
Figure 1 is a plan view of a stoker embodying matter of combustion from the retort- I0 are _
adapted to. be removed automatically as quickly 25
features of the invention.
2 theFig.
2 is a longitudinal vertical sectional view as produced by means of a power-_driven ash re
mover, preferably in the form of a rotary screw
taken substantially along line` 2-2 of Fig. 1.
Fig. 3'is a longitudinal> vertical sectional view conveyor I6 operating in a conveyor duct I1.
While in some aspects of the invention the `
taken substantially along line 3-3 of Fig. 1.
30
Fig. 4 is a perspective view of a shear plate burner retort i0 (see Figs. 9 to 12) may be pro- 30
vided in any desired form.` preferably it is gener
' forming a closure for the hopper base.
.
Fig. 5 is a .horizontal sectional view of the ally circular in shape, and adapted to be mount
in a combustion chamber of- similar shape ,
transmissionin the stoker drive taken along line ed
(not shown in detail, but represented diagram
5-5 of» Fig. 2.
‘
in Fig. 3 by thewall 18).
-35 Fig. 6 isle ien end eieveiicnni view of the matically
riphery of the retort i 0 is separated from the wall
stoker.
Fig. '7 is a fragmentary horizontal sectional view I8 to provide an annular space i9 which consti
tutes a pit adapted to receive ashes and any other
looking upwardly along line '|--1- of Fig. 9.
Fig. 8 is a fragmentary'detail sectional-view residual products of combustion overflowing from
20
occur.
`
,
.
40 taken substantially along line Hof Fig. 2l.
Fig. 9 is al vertical sectional view ofthe burner
retort taken along line 9-9 of Fig. 1.
Fig. 10 is a fragmentary plan view of the „retort
partiallybroken `away and sectioned along line
the t'op.
'
In its preferred form, the retort I0 comprises
a hollow generally cylindrical base wall 20 closedv
Vat the bottom by a cover plate 2l. An upwardly
opening fuel chamber 22 vis Iocated‘within the
wall 20, and has a circular o_utlet coaxial with 45
and inv the same plane as- the >upper edge of`
the wall. The fuel chamber 22 converges in size
' line il-ii of Iilg. 10.
and curves downwardly and laterally and is inte
` Fig.' 12 is ‘n transverse vertical sectional view.
gral with the inner end of a horizontal sleeve' 23
5c wniie ine invention is eiacepiibie of various ~ formed with and opening through one- side of 50
base wall 2li. The sleeve 23 is formed inward- ' -‘
modiñcations and alternative constructions, I the
ly from its outer end with- a counterbore 24 ter
have shown in the drawings and will herein de
445 Io--I'o' ci Fig.
l. Fig. 11 is a. vertical sectional view taken along
in a square annular shoulder 25 inside
scribe in detail the preferred embodiment. but it, l.minatingV
of
the'
wan
zo, end is adapted snugly :c receive
is to be understood that I do not thereby intend"
55 toiimit the invention to the specific form dis- 'the discharge endcf the mervduct 1,2 with the 1st- „5
2
> ter secured tightly against the shoulder.
2, 1 1 6,774
The fuel
conveyor I3 terminates in the horizontal inlet of
the chamber 22, and in operation causes the
entering. fuel as fed to force the bed of fuel 1n the
chamber gradually upwardly.
Mounted on the fuel chamber 22 is a tuyère
structure, the interior of which constitutes an
upward continuation of the fuel chamber 22. The
tuyère structure comprises a bottom tuyère ring
10 26, a plurality of intermediate tuyère rings 21
nested on the bottom ring, and a top tuyère ring
28 resting on the uppermost of the intermediate
rings, the rings being of gradually increasing
diameter upwardly. Preferably, the rings 26, 21
and 28 are flat in form, with the bottom ring 26
resting squarely on an outer marginal ñange 29
on the upper end of the fuel chamber 22, and
with each of the other rings 21 and 28 resting re
spectively upon the ring next below.
20
A plurality of spaced radial slots 30 defining
intervening seating pads 3| are formed in the
underside of each of >the rings 26, 21 and 28, and
preferably each has vertical radial sides and a
root surface flared upwardly at both ends so as
28 to define air inlet passages of varying cross-sec
tion when the rings are in nested' relation. The
slots 30 may be of -any suitable width and spaced
drical in form. vTwo inner peripheral grooves
44 and 45, defining an annular inner rib 46, are
formed in the end 43~of the Wall 40. The groove
44 receives an outer peripheral flange 41 on the
upper end of a base ring 48 which is mounted on 5
and bolted to an inwardly extending annular
flange 49 on the upper edge‘of the base wall 20. ,
The tuyère structure defines an annular air
space 50 for supplying air under pressure through
the'inlet passages 30 into the fuel chamber 22.
The bottom of the annular space 50 opens be
tween the flanges 29 and 49 into a large plenum
chamber 5I defined by the base wall 20. One
side of the wall 20 is formed with a tangentially
extending duct 52 alongside the sleeve 23, and
in communication at its inner end with the
plenum chamber 5I. The duct 52 is preferably
rectangular in form, and is connected tothe
discharge end of the air supply conduit I4.
Ashes and other residual matter of combustion -
are forced outwardly over the edge of the tuyère
back 38 into the ash- pit I9 between the retort I0
and the furnace wall I8. To provide means for
automatically removing the ashes, the 4side of the
sleeve 23 opposite the duct 52, and the base wall
26 are formed integral with an upwardly open
ing ash collecting chamber 53, preferably in the
in any desired manner. In the present instance, ' form of a trough having front and rear end walls
the slots 30 in each ring are relatively small but
30 equal in width in the half located forwardly or
adjacent the duct I2, and relatively large but
equal in widthl in the half located rearwardly or
remotely of the duct, and are arranged in uni
formly angular spaced relation about vthe periph
35 ery.
I have found that by this difference in
size of the vport areas of the‘slots 30, a superior
fuel bed is obtained in that the unburned fuel is
evenly distributed, by reason of the fact that
the increased combustion at the rear due to the
presence of more air compensates for any excess
distribution otherwise tending to occur. Prefer
ably, all of the rings 26 to 28 are provided with
slots 30 having the same angular spacing, and
with the widths of the pads 3| increasing pro
gressively upwardlyv so that the corresponding
1 slots of the respective rings are of equal widths,
and are nested in such a manner that the slots
vand pads are located „in generally vertical tiers.
54 and _55.
The front end wall 54 has an out
51 receiving the ‘iletlënd of the4 ash duct I1.
The receiving end of the ash conveyor I 6 extends
from the duct I 'I into the trough 53, and the base
of the latter conforms generally to the cylindrical
contour of the conveyor.
35
To direct the ashes into the trough 53, an ash
ring 58 is mounted on the upper edge of the wall
28 for rotation about the base ring 48. `While the
ring 58 hasa fairly close fit with the base ring'
48, it can be turned with very little power since 40
the rest of the retort is stationary, and since in
the event of any temperature increase the tol
erance is correspondingly 1increased through ex
pansion. The ash ring 58 has an annular iiange
59 along its inner periphery extending upwardly
into the groove 45 into overlapping relation with
the lower end of the wall 46 of the tuyère Vbaci:
38, and a second annular flange 6I! at its outer
periphery depending about the base wall 20 so
Each of the tuyère‘rings28 and 21 is formed
with a plurality of peripherally spaced upstand ’ as-to guard the bearing surfaces against the entry r
ing lugs on the outer edgev -which snugly receive of ashes or other foreign matter. Formed on the
and center the tuyère ring next above. In 4the outer
periphery of the ring 58. are a plurality
present instance, three. uniformly spaced lugs 32, 'of uniformly
'spaced radial vanes 6I `for moving
' 32 and 33 are provided, with the intermediate ashes lcollecting» about the retort III into the
lugs 33 of -successive rings being located alterf trough 63. .
‘
nately at diametrically opposed points. Thabot
'I'he
ash
ring
58
may
be driven vbyany suitable
tom ring 28 has two spaced depending lugs 34 means, and in the present
is adapted
extending into notches 36 formed in the flange -to be driven continuously in instance
one direction from
29. Formed on each >of the rings 21 and 28 be
the ash conveyor I6. Thus, the flange 60 is
tween the lugs 32 and diametrically opposite the formed with an internal gear 62 which is con
lug 33, -and adapted to interfit with the lug 33 stantly in mesh with a «pinion 63 fixed on the
of the ring 26 or 21 immediately vunderneath vso
as 'to lock all of the rings against rotation are two
closely spaced laterally extending lugs 31. .
Mounted on the upper tuyère ringk 28 is a hol
low tuyère back 38 having inner and outer walls.
39 and 40. Preferably, the tuyère back 38 is split
into two ring sections which arebolted together
`.when assembled. The inner wall 39 has a pe
70 ripheral flange. 4I fitting into an annular groove
42 inthe outer periphery of the ring 28, and
iiares sharply, upwardly and outwardly, toward
the >furnace wall I8. The outer wall 40 extends
substantially below the wall 39, and converges
75 uniformly toward its lower end 43 which is cy1iri_-.
upper end of a shaft 64. This shaft 64 is jour
naled in a transmission/casing 65 (see Figs. 11
and l2) bolted to one side of the base wall 28
which togetherwith the bottom tuyère ring `26 is
flattened to locate the pinion 63 inside the ash
ring 58. Fixed on the'shaftl 64 is a bevel gear
66 which meshes with a. bevel gear 81 integral
with a .shaft 68 extending through a bearing
sleeve 68 on one end of the easing 65. A packing 70
collar 18 secured to the end of the sleeve 68 pre
vents the -entry of foreign matter along the shaft
68 into the casing 65, and is located in an open
ing 1I in the rear end wall 55 of the ltrough 5,3.
The Shaft 68 has a square end 14 fitting in and 75
3
2,116,774
front wall, and vertical sides 98 and 89 with
upper inclined edges. While the hopper walls
may be joined in any suitable manner, preferably,
having- a driving connection with a socket 15 in
the end of the ash conveyor I8.
The casing E5 is fully sealed at all points
against the entry of foreign matter, and may be
the front and rear walls 98 and 91 have vertical
side flanges |00 overlying the side walls 98 and 8l,
and the latter have side flanges |0| in the upper
filled with a suitable lubricant through a supply
tube 65“ normally extending to the exterior of the
furnace. One wall of the casing il comprises
portion of their rear edges engaging the inside
of the rear wail. The top of the hopper || con
a circular disk 65h which is provided with a pres
'stitutes the _supply opening |02, and is inclined,
sure relief valve 85C for preventing overloading v with one edge lower as at the front wall 88, for 10
with the lubricant or grease.
the convenience of the attendant in throwing
in the fuel.
Stokers are installed under widely varying con
Means is provided for breaking olf clinkers at
the edge of the retort I0 without spilling un
burned coal into the ash pit I8. This means com
prises two sweep arms 16 which are mounted in
diametrically opposedV relation on the ash ring
15
58 for rotary movement therewith, and which ex
dltions. In some instances, it might be extremely ^
inconvenient to charge fuel into the hopper || 15
from the frontend of the stoker. One of the
tend upwardly almost to the edge of the tuyère
back 38 and then rearwardly relatively to the
direction of rotation and'upwardiy at a slight an
ieatures'of the invention therefore resides in so
break off the clinkers bylifting them, thereby re
turning unburned coal into the ñre pot instead
of cascading same into the ash pit I9.
The fuel hopper || (see Figs. 1 to 3) comprises
in shape so that the upper portion of the hopper
may be orientated thereon as desired in any one
constructing the hopper || that in lassembling
the upper porton with ‘the base 11, the top open
ing |02 and particularly the lower edge thereof
gie to above the retort l0. While two sweep arms
20
16 are shown, it will be understood that only one may be orientated to best adapt it to the 'installa
for which the stoker is intended.
may be used if desired. 'I‘he arms 10 thus act to` tion
illus, the top of the hopper base 11 is square
a base 11 having a vertical rear wall 18, an in
of four different positions. The upper edge _of
' the base 11 is formed on all sides with a marginal
external flange |03.~ Each of the upper walls 98
to 88 of the hopper ,|| is formed along its lower
clined forward wall 19, and.oppositely inclined
side walls 00 _and 8| deñning an upwardly open
ing generally V-shaped trough 82. Two depend
edge with an inwardly facing g‘i'oove |04 adapted
base 11, rest on a foundation 85 to support the
Preferably, the groove l|04 is defined by
striking the lower marginal portion of each wall
to receiveV the contiguous section of the flange
30 ing brackets 03 and 84, on opposite ends of the
hopper Vil andlits attachments. The front brack
iìrst outwardly, then downwardly and then in
wardly. In assembling the hopper il,> three of
the upper walls, namely the walls 01, 88 and 88,
are joined together into an integral structure, and
are then positioned on the base 11 by sliding the4
grooves |04 of the two extreme walls Q8 and 99
longitudinally onto two spaced sections of the 40
flange |03 until the intermediate section of the
et t3 is integral with and extends forwardly of
the front wall 19, and is formed with an elon
gated cylindrical bearing 88 in alignment with
the apex of the trough 02.
An external hori
zontal sleeve t1 formed on the rear wall 'll and
towhich the fuel. duct l2 is connected defines
' an outlet opening 88 also in alignmentl with the
40 trough 02. , The fuel conveyor i8 extends along
the hopper trough 02 through the outlet opening
t0 into thev duct l2, and the apex of the trough
conforms generally to the cylindrical contour
oí the conveyor vane. The' forward end ofthe
. ñange interiits with
conveyor il extends into and is guided and sup
ported in the bearing 80.
To secure the hopper base 11 in rigid assembly
with the retortlll, the fuel duct l2 extends at its
inlet end into a counterbcre I9 against a periph
the groove of the interme
diate wall 01. Then, the remaining wall, namely
the wall 96, is secured to the-walls 88 and @9, with
its groove |05 receiving the remaining section of
the flange |08. The hopper top may thus be lo
'cated in any one of four different positions. In
the position shown, the lowest wall 96 constitutes
a straight continuation of the inclined base
Iwall 19.
A
50 eral end shoulder 90 in the -sleeve 01, and is
vThe fuel and ash conveyors i8 and lo are
adapted to be driven from a common source of
i power, such as an electric motor |05, through a
engaging with ears 02 on the ends of the sleeves
transmission mechanism |06. In its preferred
form, the mechanism |08 comprises a closed cas
clamped between the shoulders 25 and 90 by
means of‘three peripherally spaced tie rods 0|
tt and el.
'
_ «
To afford convenient and ready access'to the
55
` interior of the hopper base 11 where the conveyor
ing .|01‘havìng a removable rear .cover sccticn |00.
As a means of support, the cover section |08 is
it enters the outlet opening 88, an opening $3 is
formed' partly‘in the top of the sleeve 81 and
partly in the wall 18 at the juncture. That part
60 of the opening 93 in the wall 18 may he viewed
as an enlargement of thel outlet .opening 8l. An
angular ‘plate` 08 is removably secured against
provided externally with a generally circular
flange |09 which constitutes a ‘clutch housing,
and which is removably mounted at its outer
peripheral margin on the supporting bracket 83
coaxially with the fuel conveyor I0 and bearing
86. A mounting plate ||0 is interposed between
the ilange |09 and the bracket 03, and the parts
are securely bolted together.
The mounting plate ||0 extends substantially
above the casing |01, and constitutes a primary
the wall 10 and the top of the sleeve 81 toA close
the opening 93, and- preferably vhas, an inward
projection 95 to preserve the cylindrical contour
of the outlet opening 88 and to denne an upper
shearing edge coasting with the vane of the
support for the’motor |05. ' Thus, the motor |0|i-
conveyor i3. It will-be evident that'any obstruc
tions coming between the shearing edge and the
_is mounted directly on a horizontal supporting
base plate |||, of which one end is pivotally se 70
conveyor vane and tending to stall the conveyor
cured to the plate H0, and the-other end is con
Y can quickly be removed through the opening Il v nected through a depending adjusting screw ||2 without emptying the hopper.
l with an ear ||3 on the top of the casing |01. A
The superstructure of the hopper |I
an outwardly _inclined front wall II. a vertical
rear wall ‘81 extending substantially above the
75
cover ||I for the motor |05 is mounted on the
plate H0. VIt will be evident that through angu- u
4
9,1 16,774
lar adjustment of the plate III, the motor |05
movement on the rear end of the shaft I2I,
can be located accurately in position to place the ‘ and is formed with a peripheral groove I 48-and
proper tension on the drive belt.
The transmission mechanism |06 comprises a
$1 power inlet shaft |I5 which extends through and
is journaled in a tubular enlargement I I6 on the
front of the casing |01. One end of the shaft I I5
extends externally of the casing |01 for operative
connection to the motor |05.
In the present ln
10 stance, two sheaves ||1 and IIB, each with two
V-grooves of diiferent diameters, are secured re
spectively to the motor shaft |I9 and the shaft
II5, and are connected by a V-belt |20 with side
with two diametrically opposed clutch dogs or
elements |49 on its rear face. A coupling |50
having a square end |5| in driving engagement
in a socket |52 on the forward end of thefuel _
conveyor I3, is provided on its forward end with
two diametrìeally opposed clutch dogs or‘ ele
ments |53 adapted to coact with the elements |49.
'I‘he side faces of the coacting elements |49 and 10
|53 are undercut as shown so that the rotative
force will tend to hold the elements tightly in
engagement when in use. It will be evident that
driving surfaces and interchangeably related to_ upon engagement of the clutch elements |49 and
one or the other of the sets of aligned grooves
to provide two selective speeds.
» .
An outlet or driven shaft I 2| (See Fig. 5) ex
tends below and transversely of' the inlet shaft
||5 through the casing |01. Of the shaft I2I,
20 the rear end is rotatably journaled in a bearing
|22 in the rear cover section |06, and extends to
the exterior for -operative connection with the
I 53, the drive connection from the inlet shaft I I5 15
to the outlet shaft I 2| will be completed.l
The means for actuating the clutch sleeve |41
comprises a yoke |54 ñxed to a vertical rock'
shaft |55 rotatably mounted in spaced lugs |56 «
in the housing |09, and operatively engaging in 20
the groove |40. A hand lever |51 is pivotally
secured to the upper end of theshaft |55, and
fuel conveyor I3, and the front end is journaled ' is adapted to rock the shaft selectively to engage
in a bearing`|23 in the front wall of the casing
25 |01. 'I'he front end of the shaft I2I normally is or disengage the clutch elements |49 and I 53.
The free end of the lever |51 is adapted to be
enclosed in acap |24 removably secured to the _ pivotally lowered to one side or the other of a
Vfront of the casing |01, and engages an end
thrust bearing |25 disposed against the front wall
of the cap. Upon removal of the cap |24, a hand
30 tool (not shown) may be applied to a squared sec
tion |26 of the exposed end of the shaft I 2| to
turn it and the fuel conveyor I3 manually as may
be necessitated on occasion.
A second outlet or driven shaft |21 parallel to
535 the shaft I2I extends through the casing |01.
Of the shaft |21, the rear end is journaled in a
lug |58 on a horizontal plate |59 integral with
the cover section |‘08 so as to lock the clutch
sleeve |41 in either position of adjustment.
By reason of the gear reduction between the 30
outlet shaft |21 and the shaft I2I, the ash con
veyor I6 is always driven at a greater speed
than the coal conveyor I3. Hence, the immedi
ate and complete removal of ashes Without any
likelihood of clogging and regardless of the rate
of fuel supply ‘is assured. Upon opening the
|49, |53 in the drive for the fuel conveyor
to the exterior .thereof for operative connection clutch
I3, the ash conveyor I6 and the' blower I5 still
with the ash conveyor I6, andthe front end ex- '
can be driven to complete combustion of the fuel
bearing |28 in the cover section |08, and extends
40 tends through and has a driving connection with
a sleeve I29journaled 'in a bearing |30 in the
front wall of the casing |01. "The rear end of
the outlet shaft |21 is formed with a transverse
_ bore |3I, and extends into a socket |32 in one end
.45 of an extension shaft |33, wherein it is secured for
a driving connection by means of a pin |34 ex
tending loosely through the bore. Similarly, the
other end of the extension shaft |33 has a trans
' verse bore I 35, and extends into. a socket |36 in
the forward end of the shaft lof the ash conveyor
‘ I6 to which it is operatively connected by means
of a pin |31 extending loosely through the bore.
The front end of the shaft |21 and sleeve |29
assembly also extends to the exterior of the cas
55 ing |01, but normally is enclosed by a removable
cap |30.
_
Rigid with the inlet shaft |I5 is a worm |39
in the retortv I0 even though the supply of addi~ , 40
tional fuel is discontinued.
Preferably, the drive connection between the
sleeve |29 and the shaft |21 is automatically
separable upon the'application of an excessive
force. In the present instance, this connection 45
is _shown as a shear pin |60. Since both conveyors
I3 and I6 are driven from the shaft |21, it will
be evident that the single shear pin |60 serves
to protect the gear transmission mechanism
|06 and also the motor |05 in the event that 50
either or. both of the fuel and ash conveyors
become obstructed.
.
'
The blower I6, which constitutes the source of
air under pressure for supporting combustion,
is not disclosed in detail since per se it forms 55
no part of .the invention, and generally comprises
which meshes with a worm wheel |40 keyed to an _ a housing |62 -which is mounted on a bracket
elongated sleeve |4| rotatable on the outlet shaft .
60 I2I. A gear, |42 also keyed to the sleeve I4I
meshes with a gear |43 keyed tothe sleeve |29,
thus completing the drive connection from the
inlet shaft I|5 to the outlet shaft |21. The gear
lng just described affords two substantial speed
05 reductions. Preferably the outlet shaft |21 alsoconstitutes a countershaft in the drive for the
outlet shaft I2I. To this end. aysmall gear I 44
keyed to the shaft |21 meshes with a, relatively
larger gear' |45 keyed to the shaft I2I. An anti-`
friction bearing |46 is interposed between. the
.cover section |06 _and the .gear |44 to take the
end thrust ofthe shaft I 21'.
To provide means for connecting the shaft I2I
to the fuel conveyor I3, a clutch sleeve |41 in
.75 the housing |09 is non-rotatably splined for axial
|63 bolted to one end of the transmission casing
|01, a rotor |64 driven directly from the shaft
_of the motor |05, and a damper I 65 adjustable
to vary the supply of air. A suitable blower is
shown in the patent to May No. 1,834,959. A
suitable guard |66 for the drives from the motor
|05 to the transmission |06 and the rotor |64
is mounted on one side of the housing |62. The
air conduit I4 (see Fig. 1) opens tangentially
from the lower portion of the housing |62. Pref~
erably. the conduit I4 is substantially straight,
rectangular in cross-section, and in the same
horizontal plane as the fuel and ash ducts I2
and I1.- >A clean-out cover |61 may be provided
in one side of the conduit I4,
' Since the air of combustion from the blower
Il is supplied to the retort I0 under pressure, 75,
5
2,1 16,774
it is possible in the event of a poor draft that
the pressure in the combustion chamber may
build up very substantially `and tend to force
obnoxious gases through the ñre pot 22, the fuel
duct I2 and the fuel hopper || into the atmos
phere. The pressure may also tend to force
such gases outwardly through the ash duct |1.
To obviate this serious difficulty, particularly
where there is a poor or inadequate furnace
stack (not shown), air pressure is maintained
in the Vfuel and ash ducts I2 and |1, by con
nesting same through by-passes with the air
supply, sufliciently high to resist the internal
furnace pressure. In the case of the fuel duct
15 |2, the by-pass comprises an opening |88 formed Y
in the top of the sleeve 28 inside ‘the wall 28.
A slot |88 is formed in the top of the discharge ,
end of the fuel duct I2 in communication with>
the opening |88 so asyto connect the interior of
.the duct with the plenum chamber 8|. The slot
|88 is inclined inwardly toward the _nre pot-22
soasto directthejet of airtowardthclatter
to build up kinetic as well as static resistance
to the furnace pressure. -The by-pass-for` the
ash remover comprises a by-pass line |18 com
the ring |8| is formed with a counterbore |82 re
ceiving the end of the duct |1 so that the duct
is held in place by the endwise lock applied by
the tie rods 9|. As an additional means of sup
port, the duct> |1 may be strapped to the fuel duct `5
I2 by a metal band- |83. The second receptacle
|15 is located at one side of the hopper base 11,
and is ,secured thereto and to a flange |84 joining -
the brackets 83 and 84, Connecting the adjacent
end walls |19 and |18 ofthe receptacles is a short 10
duct |85 which is formed on one side of a bracket
- |86 secured to the hopper base 11. The ash con
veyor I8 extends from the duct |1 through the
first> receptacle |14 and the duct» |88 into the
second receptacle |18 where the screw vane ter- 15
minates. `The «shaft extension `|88 extends
through the forward wall |18 of the receptacle
|15 for connection to the conveyor I8 as described.
A cap |81 on the wall-‘|18~about the shaft |88
and filled with mineral-wool serves to prevent the 20
escape of ashes.
y
'I'he outer sides of both ash receptacles are
open to receive removable ‘ash cans |88 and |88 l
of similar shape. It will be evident that `when ,
the ash can |88 becomes iìlled, the ashes ,therein> 25 '
municating‘at one end with the plenum cham; form a passage above the conveyor |8 through .
ber 8|, and connected at the other end to the _ which additional ashesare carried into the second
'ash duct |1. In the preferred form, the discharge receptacle ns. „Upon removing the asn san m
to empty same, the second ash can |88 which
end of the line |18 is connected to a
e
|1| formed in a bracket |12 secured to the ash may. be partially filled can be substituted there- 30
lduct |1. A slot |18 formed in the duct I1 at -fore in the receptacle |18..
If desired, each ash receptacle may have a
an angleinwardly and toward the fire pot 22
hinged
cover |88 secured »to the outer edge of the
communicates with the inner end of the passage `
top ~wall |11-to facilitate removal or insertion
|1| to complete the connection.
.
.
„
.
The ash duct I1 is connected at its discharge of the ash can.
end to- ash receiving means comprising one or
I claim as my invention:
`
In a~s|;oker_,inv combinationl a ilrepot, a base
more receptacles.4 Preferably, two receptacles |14
and |18,_ arranged in series, with the second wall deñning a .plenum chamber about said tire
adapted to receive the overflow from the ñrst, are -.pot, a fuel supply duct opening through one side
of' said wall to said me pot. an air supply duct `40
40 provided, and constitute in eilect a continuation ` opening to the same side of said plenum chamber.
of the ash duct |1.
i
,
Y
Each of the ash receptacles |14 and |18 is a nest ‘of tuyère rings mounted on said p_ot, said
rectangular in fo , and comprises a iioor |18, tuyère rings defining a plurality of peripherally
air ports in communication with said
a top wall |11, end walls |18 and'_|18 and an spaced
inner side wall |88. Of the ñrst receptacle |14, chamber and opening to said ñre pot„the ports 45
lone end wall |18 is secured to the rear of the in the. side of said rings adjacent said ducts be
bracket 84 under the hoppervbase 11, andthe ' ing smaller in eil‘ective area. than the ports Vin the
other end wall |18 is connected to the- ash duct ' vother side of said rings.
I1 by means of a flanged ring |8l. Preferably,
~
JosEPH HENRY WALTER.
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