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Патент USA US2137844

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Nov. 22, 1938.
P. A. KETCHPEL
2,137,844
BLAST FEED STOKER
Original Filed April 22, 1933
3 Sheets-Sheet 1
INVENTOR.
ATTORNEY‘.
Nov. 22, 1938.
2,137,844
P. A. KETCHPEL
BLAST FEED STOKER
Original Filed ‘April 22, 1933
R96
[7.
5 Sheets~Sheet 2
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[$9.8
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ZNVENTOR.
Paub Affefchpet
ATTORNEY.
Nov. 22, 1938.
p, A_ KETCHPEL
2,137,844 >
BLAST FEED STOKER
Original Filed April 22, 1933
5 Sheets-Sheet 5‘
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INVENTOR.
'Puid/ A. Ke’bc hp 91/
BY
,
'
ATTORNEY.
l’atented Nov.
1938’
2,137,844
,Nl'l‘ED STATES PATENT OFFICE’,
2,137.3“
BLAST FEED STOKEB
Paul A. Ketchpel, West Englewood, N._J., alsignor,
by mesne assignments, to The Standard Stoker
Company, Inc., (1922), a corporation of Dela
ware
Application April 22, 1933, Serial No. 887,356
Renewed April 20, 1938
‘
5 Claims. _ (Cl. 110-104)
My invention which relates to blast feed stokers
for locomotive or similar boilers has for its prin
cipal object the provision of a stoker of the type
speci?ed wherein a pressure ?uid blast propels the
5 fuel through a delivery conduit in communication
with the ?rebox, the fuel being propelled through
the delivery conduit in a manner so that the bulk
of fuel is discharged from the conduit along the
top wall thereof and a ,portion- of this fuel is
de?ected laterally by an abutment which crosses
the stratum of fuel.
-
.
It is also an object of this invention to provide
in a stoker of the blast feed type, a fuel discharge
conduit consisting of a substantially horizontal
Figure 9 is a transverse section taken on the
line 9-8 of Figure 1;
Figure 10 is a view partly in elevation and partly
in section showing a modi?ed form of the inven
tion illustrated in Figure 1;
Figure 11 is a central vertical longitudinal sec
tion of the locomotive tender showing a portion of
the stoker illustrated in" Figure 10 in section; and
Figure 12 is a detailed longitudinal section of
the front end of the locomotive, showing the
smokebox and a portion of the cinder return tube.
In Figures 1 to 9 inclusive, which illustrate one.
form of this invention, the locomotive A is pro
videdwith a ?rebox l0 having a rear wall I I which
fuel receiving portion, a horizontal fuel discharge a is provided with a ?ring opening l2 disposed above 15
portion above the plane of said receiving portion
and in advance thereof, and a feed section con
necting said portions, the fuel discharge conduit
being of a shape and con?guration such that the
20 fuel is passed therethrough without any undue
friction which would otherwise reduce its velocity.
A still further object of the present invention
resides in the provision of a blast feed stoker for
locomotives in which a trough is mounted rigidly~
25 onrthe tender beneath the fuel bin, the fuel dis
charge conduit is mounted on the locomotive and
an intermediate conduit section is‘disposed be
tween the trough and the discharge conduit, the
intermediate section, comprising a plurality of
30 ?exibly jointed elements which afford lateral and
vertical displacement of the intermediate section,
the longitudinal movement between the locomo
tive and tender being compensated by telescoping
the rearward end of the intermediate section wit
'
35 the forward end of said trough.
Another object of this invention consists in the
method and means of introducing cinders and
other partly consumed products of combustion
into the stream of coal as it is propelled through
40 the stoker whereby the partly consumed cinders,
while in a hot state, are thoroughly mixed with
the coal and thus projected into the ?rebox and
upon thelgrate thereof, which has the effect of
promoting combustion.
More speci?c objects and advantages will be
45
apparent as the description of ‘the invention is
read in connection with the accompanying draw
ings, in which
Figure 1 is a central vertical longitudinal sec
50 tion of the improved blast feed stoker, showing its‘
application to a locomotive andits tender;
Figure 2 is a partial view of the stoker as seen
from within the locomotive ?rebox;
. Figure 3 is a sectional view taken on the line
55 3-3 of Figure 2;
Figure 4 is a view taken on the irregular line
H of' Figure 1;
.
Figures 5, 6, 7 and 8 are cross sections of the
stoker discharge conduit taken on the correspond
60 ing lines of Figure 1;
"
the grates 9. The tender B is connected to the
locomotive A by a coupler C and includes the ?oor
l3 above which is disposed a coal bin‘ I4. The
floor I3 is apertured as at l5 and slidable plates
I6 cover this aperture entirely or they may be 20
moved to partially uncover the aperture so that
coal may drop into the trough l'l. This trough
or transfer conduit preferably, is rigidly mounted
beneath the ?oor l3 and houses a conveyor screw
l8 which urges the fuel forwardly toward the fire 25
box for propulsion thereinto as will presently
appear. The motive power for operatingvthe con
veyor screw it is generated by a prime mover such
as I! and is transmitted to the conveyor screw by
the gearing 20 at the rear of the trough II.
30
The forward end of the trough ll terminates in
a tubular extension 2| and the conveyor screw l8
may protrude into this extension for a short dis
tance. "A pressure ?uid head 22 is positioned in
the tubular extension 2| immediately forward of 35
the conveyor screw l8 and discharges a relatively
powerful fan-shaped blast of pressure ?uid for
propelling coal forwardly into the ?rebox through
the intermediate conduit 23 and the discharge
conduit 24.
,
40
This discharge conduit 24 consists of a for
wardly directed approximately horizontal por
tion 25 which passes through the lower portion
of the firing opening [2, a downwardly and rear
wardly extending section 26 which terminates at 45
a point below the cab deck 21 in a rearwardly
and horizontally extending fuel receiving portion
28. Secured in any suitable manner to this por
tion 28, as by the bolts 29, is an end. member 30
of the intermediate conduit 23. A plurality ‘of 50
such members are utilized to form the intermedi
ate conduit and they are joined together by
pintles such as 3| and have their coacting sur
faces of a form which permits relative angular
movement between them. At its end remote from 55
the discharge conduit 24, the intermediate con
duit 23 is secured to a sleeve 32 which ?ts freely
over the tubular extension 2i and telescopes
thereover when the locomotive and tender are
negotiating curves. If desired, a. bar such as 33 60
2
2,187,844
may be used to prevent sagging of the intermedi
ate conduit 23. This bar is loosely attached be
tween the discharge conduit 24 and the sleeve
32 in a manner which will permit a slight angular
displacement of the intermediate conduit 23
when the locomotive and tender are passing over
switches, frogs or turntables.
The discharge conduit 24 is of novel construc
tion and permits coal to be passed therethrough
10 in an ei?cient manner. At its rearmost end, the
horizontal portion 28 of the discharge conduit
. is circular in cross section in order to receive the
end member 30 of the intermediate conduit 23.
. It is desirable that the coalv be discharged from
15 the conduit 24 in a ?at sheet of uniform cross
within the sleeve member 41 and as the conveyor
screw i8 drops the coal into the sleeve member
41, .the coal is propelled through the intermedi
ate conduit 45, the discharge conduit 24 and
hence, into the ?rebox ||. A ?exible hose 49
supplies steam or compressed air to the pressure
?uid head 48.
When burning coal in furnaces, and especially
in locomotive ?reboxes, approximately twenty
per cent (20%) of the coal is unconsumed, the 10
greater portion of this unconsumed coal being
in the form of cinders. It is an object of this
invention to re-introduce such unconsumed fuel
particles into the stoker conduit, there to be
mixed with the fuel which is being propelled to 15
sectional area throughout, and hence, as the dis
ward the furnace; this is accomplished by a novel
charge conduit 24 extends upwardly and for
relation which is now to be described.
wardly toward the ?ring opening l2, its cross‘
In locomotives, the products of combustion
sectional configuration varies as will presently
pass from the ?rebox || through the lines 50
appear.
'
and into the smokebox 5| at the front end of the 20
From its circular rearward end, the conduit 24
locomotive. The smokebox 5| is supported on
expands laterally into a section as illustrated in
the cylinder saddle casting 52 in the customary
Figure 8, having a substantially ?at bottom, and manner and is divided into the compartments 53
arcuate sides and top, from which the cross sec
25 tional con?guration of the conduit changes to
that illustrated in Figure 7, having the ?at bottom
wall 35, the vertical sides 36, 31 and the arcuate
roof 36. As the conduit 24 continues upwardly
its cross sectional shape changes in a manner
30 as illustrated by Figures 5 and 6, wherein the
roof 38 is flat and the bottom wall 35 is arcuate
and curves away from the normal path of the coal
passing through the conduit so that frictional re
sistance may be reduced to a minimum.
35
By the particular construction of the discharge
conduit 24, the fuel, as it is propelled through the
conduit, passes along the flat bottom wall 35 at
the lower end of the conduit and then the direc
tion of the fuel is changed so that it passes along
40 the flat roof 38 at the upper end of the conduit.
Since the lower portion of the ?at bottom wall
35 and the upper portion of the ?at roof 36 are
formed by arcs of relatively large circles, the
velocity of the fuel in its passages through the
45 discharge conduit is not diminished by tortuous
bends and curves. Propelling the fuel along the
flat walls 35 and 38 permits the fuel to be dis
charged in a thin, wide sheet which insures even
delivery of fuel to the firebed on the grates 9.
50
The forwardly directed portion 25 of the dis
charge conduit 24 is preferably in the form of a
separate casting which is secured to the discharge
conduit 24 by the bolts 39 passing through lugs
such as 390.. Its transverse cross sectional shape
55 conforms substantially to the upper portion of the
discharge conduit as shown in Figures 5 and 6.
, At its upper forward end, the forwardly directed
portion 25 is provided at each side with a lateral
ly curved fuel deflecting channel such as 40 for
60 diverting a portion of the fuel to the sides of the
firebed. A plate 4| is disposed beneath the upper
wall of the portion 25 and is provided with abut
ments such as 42 which stop the forward ad
vance of a portion of the fuel stream and de?ect
it to the rear corners of the ?rebed. Preferably,
the vertical height of the forwardly directed por
tion 25 is slightly greater than the thickness of
the fuel stream.
'
In the form of the invention illustrated in
70 Figures 10 to 12 inclusive, the discharge conduit
24 and the trough I‘! are connected by an inter
mediate conduit 45 which consists of a flexible
tube 46 and a sleeve member 41 telescopically
.mounted on the tubular extension 2| of the
75 trough. IT. A pressure ?uid head 48 is secured
and 54 by a diaphragm or wall that comprises a
rear imperforate portion 55, and a foraminous 25
portion or screen 56. The compartment 54 com
municates directly with the lines 50, and the
compartment 53 communicates directly with the
inside stack or petticoat pipe 51 and the smoke
stack 58, through which the waste gases of com 30
bustion are discharged to the atmosphere. The
waste gases of combustion carry a relatively large
amount of cinders and unconsumed fuel particles
which pass through the ?ues 50 into the compart
ment 54. Fine particles of unconsumed fuel pass 35
through the foraminous portion 56 while the
larger particles drop from the screen onto a chute
or wall 59 which extends downwardly and are
deposited in the lower portion thereof.
The
cinders are thus deposited into a trough-like 40
structure 60, of which there may be two, one at
each side of the exhaust nozzle 6|.
_
These. solid particles of fuel are discharged
from the smokebox by a pressure ?uid blast is
suing from the jet head‘62, disposed within each
trough 60. If desired, a blower fan may be uti
lized to generate swiftly'moving currents of pre
heated air for returning the hot cinders to the
fuel steam, and the same or a similar fan may be
used to propel the coal into the ?rebox. To pre 50
vent the dissipation of‘the pressure ?uid blast
through the smokebox, a hood 63 is provided over
each trough and as the cinders drop into the zone
of action of the jet head 62, they are blown rear
wardly through tubes such as 64 to a point ad 55
jacent the intermediate conduit 45. At this
point, the tubes 64 are each provided with the
'return bend 65 which reverses the direction of
?ow of the cinders and causes them to be deliv
ered into the intermediate conduit 45 immedi 60
ately ahead of the jet head 48.
Thus, the hot
cinders are introduced into the path of ‘the coal
as it passes through the stoker conduits and in
this manner an intimate mixture of coal and hot
cinders is spread over the grates 9. This assures
the positive delivery of the cinders onto the fire
bed and the presence of the hot cinders in the
coal stream has the effect of heating the coal
to a point such that its ignition in the ?rebox is
accelerated.
70
From the foregoing, it will be apparent that '
I have produced a stoking device which is e?l
cient in operation, consists of but a few parts
and one which will realize a marked fuel saving
in practice. Various'changes and modi?cations
2,137,844
3
of my invention may be made within the scope
charge section, pressure ?uid blast emitting
of the following claims.
I claim:
means in said conduit located to discharge a
blast of ?uid under pressure so directed as to
propel the fuel through said ?exible section and
1. In combination with a ?rebox having a
grate and a ?ring opening in one of its walls
above said grate, a source of fuel supply, a fuel
conduit extending from such source to said ?r
ing opening, said conduit including a discharge
said discharge section and onto the grates, and
means for conveying fuel from said trough to
said pressure ?uid blast emitting means, said
pressure ?uid blast emitting means constituting
the sole means for projecting the fuel onto the
section in communication with said ?ring open
ing, pressure ?uid blast emitting means in said‘
conduit located to discharge a blast of ?uid under
pressure so directed as to propel the fuel through
said conduit and onto the grate and means ‘for
conveying fuel from the source of supply to said
pressure ?uid blast emitting means, said pres
sure ?uid blast emitting means constituting the
sole means for projecting the fuel onto the grate,
ends offset with respect to each other and open
ing in opposed directions, the receiving end por
tion of said discharge section being formed as a
curved elbow and the discharge end of said dis
charge section being formed as a curved elbow, 15
the outer portion of the curve of each of said
said discharge section having its opposite ends
offsetwith respect to each other and opening in
20 opposed directions, the receiving end portion of
elbows being so arranged that the tangent to the
outer portion of the curve of said ?rst named
elbow at its forward end intersects the outer 20
portion of the curve of said second named elbow.
said discharge section being formed as a curved
elbow and the discharge end of said discharge
section being formed as a curved elbow, the outer
portion of the curve of each of said elbows being
25 straight in transverse section. said elbows being
so arranged that the tangent to the outer por
tion of the curve of said ?rst named elbow at its
forward end intersects the outer portion of the
curve of said second named elbow.
30
2. In combination with a ?rebox having a grate
and a ?ring opening in one of its walls above
said grate, a source of fuel supply, a fuel <'
iduit
extending from such source to said ?ring open
ing, said conduit including a discharge section in
communication with said ?ring opening, pres
sure ?uid blast emitting means in said conduit
located to discharge a blast of ?uid under pres‘
sure so directed as to propel the fuel through
said conduit and onto the grate and means for
conveying fuel from the source of supply to said
pressure ?uid blast emitting means, said pressure
?uid blast emitting means constituting the sole
means for projecting the fuel onto the grate, said
discharge section having its opposite ends offset
with respect to each other and opening in op
posed directions, the receiving end portion of
said discharge section being formed as a curved
elbow and'the discharge end of said discharge
section being formed as a curved elbow, the outer
50 portion of the curve of each of said elbows being
straight in transverse section, said elbows being
so arranged that the tangent to the outer por
tion of the curve of said ?rst ‘named elbow at
its forward‘ end intersects the outer portion of
55 the curve of said second named elbow, a fuel
de?ector within the ?rebox at the forward end
of the roof of said second named elbow and an
abutment member beneath said de?ector, said
abutment member extending transversely of the
60 direction of projection of the fuel within the
lower stratum of projected fuel.
3. In combination with a locomotive and its
tender, the former having a ?rebox provided with
a backwall having a ?ring opening therein above
85 the ?rebox grate and the latter having a fuel bin
disposed above the tender deck, a fuel conduit
extending from the tender to the locomotive and
communicating with the ?rebox through said
?ring opening, said conduit including a trough
rigidly disposed beneath said bin and receiving
fuel therefrom, a discharge section on said loco
motive arranged to discharge fuel into the firebox through said firing- opening, and a ?exible
section connecting said trough and said dis
grate, said discharge section having its opposite 10
elbows being straight in transverse section, said
4. In combination with a ?rebox having a ?r
ing opening in an upright wall thereof, a source
of fuel supply, a fuel conduit extending from such
source to said ?ring opening, said conduit in 25
cluding a discharge section in communication
with said ?ring opening, means for generating a
?uid stream in said conduit so directed as to
propel the fuel through said conduit and said
?ring opening into the ?rebox and means for 30
introducing fuel into the path of said ?uid
stream, said ?uid stream generating means con
stituting the sole means for projecting the fuel
into the ?rebox, said discharge section having
its opposite ends offset with respect to each other
and opening in opposed directions, the receiving
end portion of said discharge section being
formed as a curved elbow and the discharge end
portion of said discharge section being formed
as a curved elbow, the outer portion of the curve 40
of the elbow at the discharge end of said dis
charge section being straight in transverse sec
tion, said elbows being so arranged that the
tangent to the outer portion of the curve of said
?rst-named elbow at its forward end intersects
the outer portion of the curve of said second
named elbow.
'5. In combination with a ?rebox having a ?r
ing opening in an upright wall thereof, a source
of fuel supply, a fuel conduit extending from 50
such source to said ?ring opening, said conduit
‘including a discharge section in communication
with said ?ring opening, means for generating
a ?uid stream in said conduits so directed as to
propel the fuel through said conduit and said 55
?ring opening into the ?rebox and means for in
troducing fuel into the path of said ?uid stream,
said ?uid stream generating means constituting
the sole means for projecting the fuel into the
?rebox, said discharge section having its oppo 60
site ends ofiset with respect to each other and
opening in opposed directions, the receiving end
portion of said discharge section being formed
as a curved elbow and the discharge end por
tion of said discharge section being formed as a 65
curved elbow, the outer portion of the curve of
each of said elbows being straight in transverse
section, said elbows being so arranged that the
tangent to the outer portion of the curve of said
?rst-named elbow at its forward end intersects 70
the outer portion of the curve of said second
named elbow.
PAUL A. KETCHPEL,
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