close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2403787

код для вставки
July 9, 1946.
C. V. CARROLL
2,403,787
GRATE
Filed Aug. '7, 1944
_"v,
NN
2.
N`«n
E.
Nm
\
.VëNÓWL
Patented July 9, i946VV
2,403,787
(STATES
»omcß ` ,
2,403,737
`~GRATE
VV,Charles
Carroll, -Minneapolis,A Minn., assigner
to. Wm. Bros.l Boiler & Manufacturing Co.,
Minneapolis, Minn., a corporation of Minne
Sota
Application August‘7, 1944, SerialNo. 548,398
9 Claims. ' (Cl.V 1261-163) Y
1 ,
2,
4This `invention relates to the design of lgrate
Figure 3 isa topplan view of a grate element
`and a portion of two Vadjacent grate elements,
-surfaces'used for supporting and/or furnishing
air to a solid fuel bed for combustion on the grate `
surface, the-grate surface design being applicable
one on each side;
_
f
~
i
Figure ‘lis an enlarged fragmentary sectional
View taken along the >lines 4-4 of Figure 2;
Figure 5 lis an enlarged fragmentary isometric
`to any type `of «grate structure such as a shaker
grate, dumping grate, chain grate .or rotating
grate. It is known that for efficient combustion
View of a grate element of Figure 1'; and
Figure 6 is a fragmentary sectional view of
fof solid fuels without an undue excess air loss it `
is necessary to supply air uniformly to the under
.adjacent portions »of two grate elements.
side of the solid fuel bed. This function of »uni .l0
The- grate surface vof the present invent-ion'is
‘form air-supply has been accomplished in the
illustrated -as applied to `a shaker .or dumping
`
past, with. only partía-l success. It isan object
`
type of grate but it will .be understood to be
-ofvthis invention vto provide a more satisfactory
applicable `to-‘other types of grates. .Referring
design `-of gratesurface capable of delivering air
to the drawing there is illustratedY a grate bar
uniformly- to `the under sideof» a solid fuel bed. I
generally designated I-IJl of the-type used in hand
havefound- that foreflicient combustion of thin _or stoker fired, Vstationary or -movable lboilers
wherein the grate `bars are mounting upon a
-solidà fuel beds particularly, itis desirable tosupl- a
îply the> air ina manner so as to produce. a swirl
Ying action. and divergent air .flow so that the solid
carrier bar generally designated-I I which is trun- `
`nioned about pivots t2 so 'as to allow the carrier
fuel bed is vprovided with combustion air uni
formly throughout'its, entire'Y area.
20 barY IIand _the Igratebar IU thereon toY be ro
tated in the direction of arrow I3 for grate shak
- »
It. is an object -of ther vinvention Yto provide a
ing anddumping operation. yThe ñre surface of
grate surface of improved design capablerof ac
the grate bar |70, to thedesign of `which the
complishing these functions and yet of a design
.invention is particularlyA directed, is illustrated
such that grate elements may be replaced easily 25 generally at l5 and maybe considered as `con
Without disturbing other elements. k'It is ak further
'objectv of the invention to provide an exceed
sisting of a thickened head portion having a top
surface I-S` and side surfaces I:8 and I9, the »side
ingly rugged grate element capable of withstand
surfaces being parallel with each other and ver
ing rough‘usage and extreme temperature vari-~
Along the upper corner formed at the
tical.`
ations. It is a.v further and especial object of 30 `junction of the top surface IS- and the side sur
the invention to provide an improved grate sur.
face I9 there are provided a plurality of notches
face capable Yof delivering air flow uniformly in>
2B of identical configuration and along the junc
a plurality of divergent swirling paths to a solid
[fuel bed without at ïthe same time presenting any
tion ofthe top I6l and-side surface I8, there are
a plurality of notches V2|, likewise identical with
those at 29. The notchesk 20 on thefsidev surface
I9 .are staggered with relation to the notches 2.I
on -the side surface I8, as shown in the drawing.
The intervening spaces between the notchesv 20
straight-through vertical passages over the grate ,
area, and to provide a grate lsurface wherein the
combustionv air supply is .metered-through ori
ñces and then expanded so as to reduce the air
lvelocity and' thereby reduce fly-ash difliculties.
and 2i are chamfered off slightly, as illustrated
It is also> an object of the invention to provide> a 40 at 22 and 2.3, though the chamfering is not so
grate surface of non-sifting character.U It is a
extensive as to- reach the level of the notches 20
and 2|. The intervening spaces between the »
'further object of the invention to provide an
improved design of grate surfaces capable of
notches 20 and 2|y are approximately equal in
being manufactured at 10W cost without the ne
width to the width `of the notches and each inter
cessity of coring or other expensive molding .
vening space is providedl with an air chute in'
procedures.
>taglio- recess 24 formed into'the side Wall.` Thus,
as shown in Figure 5, the side wall I9 is pro
vided with air chutes 24 having parallel walls 24a
and 24h and a uniform intaglio depth illustrated
Other and further objects of the inventionare
those inherent in the apparatus herein illus
trated, described` and claimed.
'
y
The -invention is illustrated. with reference to
the drawing whereinV
„
by the bracket 24e.
Figure 1 is a top plan view of ka single grate
elemente;
-
`
i
Figure 2 is a side elevational view of a
element illustrated in .Figure l;
_
.
The air chutes 24 terminate at the level of line
.
grate
-
.5.5
25-25, illustrated by the dimension Aof Figures
2 and 5, it being-noted that the air chute is tapered
out as illustrated at :24e so as to causethe air
moving upwardly in the-air chute to be forced out
2,403,787
3
-4
more uniform distribution of combustion air in
accordance with the design here presented.
In the grate design of the present invention the
side of each grate lies in contact with the side of
the adjacent grates, the air passage portion ex
in the direction of the side wall I9; The notches
20 and 2| terminate at the level of line 28-2B,
Figure 2, which is lower than the line 2li-_25, as
illustrated by the dimension B. The notches 20
and 2| are of gradually increasing width from
bottom to top, as illustrated by the dimension C
cepted. No space is therefore available` through
which sifting may occur, ¿forïtheupward draft and
at the bottom of the notch, and the dimension D
bent configuration of the air passages (see Figure
.4) serves to prevent downward movement of ash
walls 2 la and 2 Ib of the notches 2| are preferably'l 104 at these places. Sifting is therefore substantially
at the top of the notch, Figure`2. The walls 20a
and 20D of the notches 20 and the corresponding
not quite vertical and are filleted into the surfaces
20c and 2 Ic of their corresponding notches.
Referring to Figure 1, it will be observed that
the notches 20 terminate at a line 30-30 sepa
rated by the dimension E from the centerline of-
' i eliminated.
As there are no interior areas in the grate de
' sign the entire grate surface may be cast by
ordinary green sand molding and does not re
15
the grate bar, the notches 2| being similarly ter
minated at the line 3|--3|, likewise separated
quire any coring.
`
It is to be understood that the grate surface of
the present invention is applicable to grate bars,
chain grates, dumping or rocker grates and other
from the center line by the dimension F. Dimen
forms of grates wherein air is delivered to the
sions E and F are preferably equal.
Referring to Figure 3 the grate bar 10 is 20 solid fuel bed. The form of support for the grate
bar is adapted to the mechanical under-construc
mounted with its side surf aces in contact with the
tion of the grate, and to the fuel and air feeding
side surfaces of grate bars Illf and I0". Thus
systems> employed.Y
the surface I8 of grate bar IU is in contact with
As many apparently widely different embodi
the surface I9' of grate bar Ill’ and the surface
|,9 of grate bar l0 is in contact with Ythe surface 25 ments of this invention may be made withoutïde
parting from the spirit and scope thereof, it is to
I8" of grate bar I0”. Since the air chutes 24
be lunderstood that I do not limit myself to the
and the notches 20 and 2| on opposite sides of
specific embodiments herein except as defined
each grate bar are staggered with respect to each
by the appended claims.
other, the mounting of a plurality of grate bars
'
I0, l0’ and l0” side by side serves to locate the 30 `Whatl I claim is:
1. A grate bar having a head portion composed
notches 20 and 2| of one grate bar, for exampler
of topl and bottomY surfaces and parallel flat side
I0, opposite the air chute of the adjacent grate
surfacesv forming the extreme lateral surfaces of
bars I0’ and I0". Referring to Figure 6 it will
the bar, said surfaces being spaced apart a dis
be observed that the air chute 24 of grate bar IB
is thus adjacent the notch 2|" of the grate bar 35 tance at least equal to the width dimensionof the
bar, the edges at the junction of the top land side
surfaces being inwardly notched at evenly spaced
intervals along each side, air-passage grooves in
said sides, said grooves extending only part way
HJ”, and since the air chute 24 extends upward to
a dimension A, which is greater than the lower
mostedge of the air chute 2|", the air chute
and notch thus overlap slightly, and air may
accordingly move- upwardly, as illustrated by the 40 up the side from the bottom of the side surfaces,
each said air-passage groove being located in the
arrows 32 of Figure 4. The air is deflected out
wardly by the outwardly slanted surface at the
side surface spaces between the notches, and a
upper part of the air chute 24 and upon reaching
downwardly extending support below said head
the notch 2| which also converges upwardly, the
portion.
'
.
air is distributed to a larger area of the grate than 45
2. A grate bar having a head portion composed
is represented merely by the cross section of the
of top and bottom surfaces and parallel flat side
air chute 24. It will thus be observed that notches
surfaces forming the extreme lateral surfaces of
24 and 24" serve as metering orifices through
the bar, said surfaces being spaced apart a dis
which the volume of combustion air may be care
tance equal to the width dimension of the bar,
fully'controlled by suitable regulation of the draft
5.o
'on the grate. At the same time, the expanding
-notches 2Q and 2l reduce the velocity of the air
before it reaches the fuel bed and consequently
diminishes fly-ash trouble.
Referring again to Figure 6, it will be observed
that air chutes 24" of grate bar I0" lie opposite
notches 2|-2I of grate bar l0, and Serve to
deliver air to them in the same way as air chutes
the edges at the junction of the top and side sur
faces being inwardly notched atevenly spaced
intervals along each side, the notches along one
Iof the flat sides being staggered with respect to
v55
the notches along the opposite side,_air-rpassage
grooves in the sides, said grooves extending only
part way up the side from the bottom of the side
surfaces, each said air-passage groove being an
indentation located in the side surface in the
spaces between the notches, and a downwardly
24 delivei- air to notches 2|”. It may also be
noted that there is no vertical passage through 60 extending support below said head portion.
the grate assembly of` a plurality of grate bars.
3. A grate bar having a head portion bounded
by a top surface and parallel nat side surfaces,
The staggered 'relationship of the notches on
said side surfaces forming the extreme lateral
opposite sides of the grate cause a definite swirl
surfaces of the bar, said surfaces being spaced
ing action 0f the air, as illustrated by the arrows 65 apart a distance at least equal to the Width di
rnension of the bar, the edges formed at the junc
35 in Figure 3, thus causing the «air to be distrib
tion of the top and side surfaces being inwardly
uted over a large portion of the solid fuel bed
See Figure 4.
immediately in contact with the grate surface.
notched at regularly lspaced intervals along each
side, the notches along one side being staggered
It has been observed that with a grate surface of
the design herein illustrated that there is a uni 70 with respect to the notches'on the other side, the
surface of each said notch extending along an
form distribution of air in a solid fuel bed, even
angularly disposed plane from near its bottom at
the junction with the side surface in which it is
inch, whereas grate surfaces of prior design
located to near the middle of the ‘top surface,
showed definite points of intense burning with a
fuel bed of corresponding depth.- This proves the 75 said notches'being of increased width from bot
Where the fuel bed has a depth of as little as one
2,403,787
5
6
tom to top, and air passage grooves in the sides,
tersection near but spaced above the lower edge
said grooves being recessed into the side sur
faces and reaching only part way up the side from
the bottom of the side surfaces to a position above
the bottom of the notch, each said air-passage
` of the side wall, said notches being of increas
, ing width from bottom to top and terminated in
line of intersection on `the top surface, said line
of intersection being between the centerline of
groove being located in the side surface between
the grate bar and the side surface, air-chute re
cesses indented into each of the side walls, each
said recess extending only part way up the side
the notches.,
4. The apparatus of claim 3 further charac
wall from the lower edge of the side Wall and
width in the direction along the side of the grate 10 tapered out and terminated at a level above the
line of intersection of the notch near the lower
bar, approximately equal to the bottom width of
edge of the side wall, said air-chute recesses being
the notches.
'
.
in the intervening spaces between the notches on
5. A grate bar of the type set forth in claim 3
further characterized in that the junction of the
each side.
8. A grate bar of the type set forth in claim ’I
top and side surfaces is slightly charnfered be
further characterized in that the edges between
tween notches.
the notches, formed by the junction of the top
6. A grate surface comprising a carrier support
and side surfaces, is chamfered slightly.
and a plurality of grate bars, the fire element of
9. A grate surface comprising a carrier support
each grate bar being composed of a solid member
and a plurality of grate bars, the ñre element of
having a flat top surface and parallel flat vertical
each »grate bar being composed of a solid mem
side surfaces, said side surfaces each including
ber having a, flat top surface and parallel nat
ñat continuous similarly shaped areas extending
vertical side surfaces, said side surfaces each
from one end of the grate bar to the other end,
including flat continuous similarly shaped areas
said areas each being a uniform distance from a
vertical central -plane through the bar, the oppo 25 extending from lone end of the grate bar to the
other end, said areas each being a uniform dis
site edges formed by the junction of said top and
tance from a vertical central plane through the
both side surfaces being notched at regular in
bar, the opposite edges formed by the junction
tervals, the width of notches and intervening
spaces being approximately equal, the notches
of said top and both side surfaces being notched
along one side being staggered so as to- be opposite 30 at regular intervals, «the width of notches and
terized in that the air-passage grooves have Ya
the spaces on the other side, air-chute recesses
v indented into the side walls and extending only
intervening spaces being approximately equal,
each side, said grate bars being mounted side by
notches being of increasing Width from bottom
the notches along one side being staggered so as
to be opposite the spaces on the other side, each
lpart way up the sidewall from the lower edge of
said notch being a ñat chamfered surface ex
the side wall to a level above the lowermost part
of the notches, said air-chute recesses being in 35 tending from a line of intersection near, but
the intervening spaces between the notches on
spaced above, the lower edge of the side wall, said
side on the carrier support with the side surface
to top and terminated in line of intersection on
of adjacent bars in contact so as to locate the air
the top surface, said line of intersection being
chute recesses of one bar with the upper part of 40 between the center line of the grate bar and the
each air chute overlapping the lower part of the
side surface, air-chute recesses indented into the
corresponding notchesof adj acent grate bars, and
flat surface of each of the side walls, each said
recess extending only part way up the sidewall
with the flat continuous side area of one bar in-y
contact with the similar area of the adjacent bar.
from the lower edge of the side wall and up
45 wardly, being then tapered out and terminated
7. A grate bar wherein the fire element is com
at a level above the line of intersection of the
posed Of a solid member havin-g a iiat top sur
face and parallel flat vertica1 side surfaces, said n notch near the lower edge of the side wall, said
air-chute recesses being in the intervening spaces
side surfaces each including ñat continuous simi
larly shaped areas extending from one end of 50 between the notches on each side, said grate bars
being mounted side by side on the carrier sup
the grate bar to the other end, said areas each
port with the side surfaces of adjacentbars in
being a uniform distance from a vertical cen
contact so as to locate the air-chute recesses at
tral plane through the bar, the opposite edges
one bar with rthe upper part of each air chute
formed by the junction of said top and both side
surfaces being notched at regular intervals, the 55 lapping the lower part. of the corresponding
notches of adjacent grate bars, and with the flat
width of notches and intervening spaces being
continuous side area of one bar in contact with
approximately equal, the notches along one side
being staggered so as to be opposite the spaces
the similar area of the adjacent bar.
on the other side, each said notch being a ñat
chamfered surface extending from a line ofin
_ CHARLES V. CARROLL.
Документ
Категория
Без категории
Просмотров
0
Размер файла
611 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа