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Патент USA US2404848

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July 30, 1%‘,
‘
W. KEssLER
2,404,848 '
SPREADER STOKER APPARATUS
Original Filed July 25, 1943
FIG 3.
111
FIG. 2. E
WITNESSES:
INVENTOR
WILBU R KESSLER
. 41. MW,
y?/Www’
BY
ATTORNEY
2,404,848
Patented July 30, 1946
UNITED STATES PATENT OFFICE
2,404,848
SPREADER STOKER APPARATUS >
Wilbur Kessler, Newtown Square, Pa., assignor to
Westinghouse Electric Corporation, East Pitts
burgh, Pa., a corporation of Pennsylvania
Original application July 23, 1943, Serial No.
495,807, now Patent No. 2,390,155, dated Decem
her 4, 1945. Divided and this application May
5, 1945, Serial No. 592,112
2 Claims. (Cl. 110-415)
1
‘This invention relates to stokers, more particu
larly to stokers of the spreader or sprinkler type,
andfhas for an object to provide improved ap
2
.
'
Y
having. a pair of openings [4 therein, through
which fuel is fed by the spreader units Hi to
the grate structure 16 forming the bottom of the
furnace combustion chamber. In this ?gure, the
paratus of this character.
.
numeral l8 indicates the fuel bed as normally de
To the best of applicant’s knowledge, most in
posited upon the grate surface by the conven
dustrial spreader-feed stokers on the market fail
tional industrial spreader stoker units now on
to provide uniform distribution of fuel laterally of
the
market. The lateral areas of relatively thin
the grate surface. The bed of fuel deposited
fuel deposits are indicated by the reference char
thereon is generally thin along the lateral edges
of the area of distribution of each feeder unit; 10 acter [9, while 26] indicates the portions of the
grate surface which are nearly empty of fuel and
and, where a plurality of such units are employed
through which large quantities of excess air pass
in a furnace, the space on the grates between the
from the plenum chamber below the grate struc
feeders is nearly empty of fuel adjacent the fur
ture
to the combustion chamber thereabove.
nace front wall, this nearly empty area being tri
angular in shape with its base at the front wall 15 In order to make up for the de?ciency of
fuel along the lateral portions of the fuel de-.
and having an altitude longitudinally of the grate
posits upon the grate surface, it is proposed to
of from 2 to 3 feet.
feed to the edge or end portions of the impellers
Large quantities of excess air 'are admitted to
of the spreader units, a greater quantity of fuel
the combustion chamber through the nearly
empty spaces on the grates and the thin portions 20 per unit area of ram face than is delivered to the
intermediate portions of the impellers, and Figs. 2,
of the fuel bed at the lateral edges. 'As a result,
either a high furnace or a high degree of tur
bulence is necessary to make this excess air use
ful for combustion.
Therefore, another object of the invention is to
provide a spreader fuel feeder for stokers which
will provide more uniform lateral distribution of
the fuel laterally of the furnace than has been
obtainable heretofore.
A further object of the invention is the provi
sion of a fuel-feeding mechanism for delivering
a greater quantity of fuel to the end portions of a
fuel-impelling device, than is delivered to the in
termediate portion thereof.
These and other objects are effected by the in
vention as will be apparent from the following
description and claims taken in connection with
the accompanying drawing, forming a part of this
application, in which:
Fig. 1 is a plan view of a furnace fed by a pair
of conventional spreader units, and illustrating
the problem which applicant is solving;
Fig. 2 is a plan view of a construction of the in
vention, taken along the line 11-11 of Fig. 4, look
ing in the direction indicated by the arrows;
3 and 4 illustrate one form of apparatus for pro
viding this additional supply of fuel.
Referring now more particularly to Figs. 2, 3
25 and 4, fuel is fed from the hopper 22 by rams 23‘
and 24 rearwardly over the spill plate 26 to the
rotary impeller 21 disposed therebeneath, the
blades of the rotary impeller projecting the fuel
fed thereto rearwardly through the furnace front
30 wall opening M to the grate 16 in the bottom of
the furnace.
Reciprocatory motion is adapted to be imparted
to the rams 23 and 24 of each spreader unit l5
by a single oscillating shaft 30, carrying crank
arms 3| and 32, the former being connected to
35
the central ram 23 by links 33 and the crank
arms 32 being connected to the side rams .24 by
links 34.
As best shown in Fig. 4, the links 33, providing
the driving connection for the central ram 23,
40
include a lost-motion connection 36 between the
links 33 and the crankarms 31, by which the
stroke of the central ram 23 may be varied by
adjustment of the handwheel 31. Inasmuch as
45 the links 34 providing the driving connection for
the side rams 24 are of ?xed length, it will be
Fig. 3 is a sectional View taken along the line
apparent that it is possible to vary the relative
III—III of Fig. 2, looking in the direction indi
lengths of the feeding strokes of the rams 23
cated by the arrows; and
and 24. Inasmuch as the three rams are driven
Fig. 4 is a sectional view taken along the line
IV—IV of Fig. 2, looking in the direction indi 60 from the common shaft 30, it will be apparent
that, if the central ram 23 has a shorter stroke.
cated by the arrows.
than the side rams 24, the latter will deliver a
Referring now to the drawing more in detail,
greater quantity of fuel to the corresponding side
with particular reference to Fig. 1, there is shown
or end portions of the rotary impeller 21, thereby
a furnace l0, comprising a front wall ll, side
walls l2, and. a rear wall l3, the front wall ll 55 providing excess fuel at these locations tending
2,404,848
,'
3
to minimize thinness of fuel bed at the edges of
the areas fed by the spreader units.
This application is a division of my copending
application Serial No. 495,807, ?led July 23, 1943,
now Patent‘ No.;2,390,155, granted December 4,
1945.
t
While the invention has been shown in but one
'7
4 ,
’ ing a longer working stroke of the end rams than
of the intermediate ram, whereby said end rams
deliver more fuel per unit area of ram face than
does said intermediate ram.
.Y 2. In a stoker, fuel-‘feeding mechanism com
prising a hopper; an impeller; a reciprocal ram
structure having an effective width transverse
form, it will be obvious to those skilled in the ‘ to the direction of its reciprocation substantially
art that it is not so limited, but is susceptible of
equal to the length of the impeller in the same’
various changes and modi?cations ‘without de 10 direction, said ram structure comprising a spaced
parting from the spirit thereof.
What is claimed is:
1. In a stoker, fuel-feeding mechanism com
prising a hopper; an impeller; areciprocal ram
structure for pushing fuel from the hopper to
the impeller, said ram structure comprising an'
intermediate ram and an end ram at each side
of said intermediate ram; means for imparting _
reciprocatory motion to the intermediate ram to
cause it to deliver fuel to the corresponding in
termediate portion of the impeller at a predeter
mined rate; and means for imparting reciproca
tory motion to the end rams to cause them to
deliver fuel to the correspondinglend portions of
the impeller, said last-mentioned means provid 25
‘pair of end rams and one or more intermediate
rams therebetween; means for imparting recip
rocatory motion to the intermediate ram or rams
to cause them to push fuel from the hopper to
the intermediate portion of the impeller; and
means for imparting reciprocatory motion to the
‘end rams to cause them to push fuel from the
hopper to the corresponding end portions of the
impeller, said last-mentionedmeans providing a
longer working stroke of the end rams whereby
said end rams deliver more fuel per unit area of
ram face to the corresponding end portions of the
impeller than the intermediate ram or rams de
liver to the intermediate portion of the impeller.
"
WILBUR KESSLER;
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