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Патент USA US2122951

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July 5, 1938.
W* A. RIDDELL
VENTILATED TUYERE
Filed May 18, 1936
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July 5, 193s.
W_ A. RlDDELL
2,122,951
VENTILATED'TUYÈRE
Filed May 18, 1936
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Patented July 5, 1938
UNlTED STATES
PATENT OFFICE
2,122,951
VENTILATED TUYÈRE
111
William A. Riddell, Frederick, Md., assig‘nor to
,
The General Engineering Company, Frederick,
Md., a corporation of Maryland
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‘
Application May 18, 1936, Serial No.‘80,444
(Cl. 110-44)
8 Claims.
My invention relates broadly to furnaces and
more particularly to an improved construction of
Ventilated tuyère for furnaces.
_
One of the objects of my invention is to provide
‘v a construction of ventilated tuyère for furnaces
having means for reducing the tendency of the
tuyère to be burned out under conditions of high
temperature furnace operation.
‘ Another object of my invention is to provide
16J a construction of tuyère having means for uni
formly distributing air beneath the fire bed while
eliminating the tendency of blowing holes in the
lire bed.
»
_
Still another object of my invention is to pro
f“ vide a construction of tuyère formed from a cast
ing having a relatively thin wall shaped to dis
tribute air under pressure radially from a sub
stantially central'position beneath the plate and
in a relatively narrow conñnecl zone extending in Y
20 a plane beneath the plate substantially parallel
with the plane of the plate.
,
A further object of my invention is to provide
aconstructicn of tuyère having passages there
through for the recirculation of air currents tend
25 ing to maintain the tuyère at a safe operating
temperature and independently of the distribut
ing means for delivering air under pressure be
neath the ñre bed.
Another object of my invention is to provide
30 a construction of tuyère having elongated slotted
self-clearing air passages therein.
‘ A still further object of my invention is to pro
vide a construction of ventilated tuyère having a
is a longitudinal view through the tuyère plate
taken on line 6-6 of Fig. 4.
Referring to the drawings in detail, reference
character I indicates a tuyère plate embodying
my invention. Thev tuyère plate I is illustrated Ul
in assembled superimposed relation with respect
to three similarly formed tuyère plates. For pur
poses of interlocking the tuyère plates, each tu
yère plate is provided with a centrally positioned
substantially rectangular aperture 2 provided l0
with a shoulder 3 adjacent the forward end
thereof. Each tuyère plate is provided with a
depending member 4 connected therewith having
a hook-shaped end portion 5 thereon directed
toward the front of the tuyère plate. A strength- l5
ening web 6 is provided immediately behind the
depending member 4 and extending to the shoul
der 3> of the tuyère plate. The lower surface of
the tuyère plate I immediately adjacent the cen
tral aperture 2 is tapered upwardly and terrni- 20
nates in a substantially thinner rearwardly pro
jecting portion of the tuyère plate as shown. The
rearwardly projecting portion of the tuyère plate
I terminates in an inwardly curved edge indi
cated at 8. The rearwardly projecting portion 25
of the tuyère plate I is symmetrically apertured
at 9. In the foregoing description and herein
after, I refer to the front of the tuyère plates as
that portion which is exposed and seen when
viewing an assembled grate, namely the portion 30
terminating at the edge I8.
For purposes of insuring the recirculation of
air through the tuyère plates and the mainte
nance of the tuyère plates at relatively safe oper
ating temperatures, I provide substantially seg- 35
multiplicity of radially extending deflecting mem
35 bers immediately beneath the tuyère plate for
directing air beneath the ñre bed in a prenat . mental shaped or curved slots l0 in the plate I.
terned Zone extending in a plane substantially The slots I0 are separated at the central longitu
dinal axis of the plate by a strengthening web
parallel with the plane of the tuyère.
Otherand further objects of my invention re
40 side in an improved construction of cast tuyère
as set -forth more fullyin the speciñcation here
inafter following by reference to the accompany
ing drawings, in which:
v
~ Figure 1 is a plan view showing a group of
4
portion of the plate. The slots I0 are curved to
substantially conform in shape to the perimeter 40
of the tuyère plate I indicated generally at I 6
from which the tuyère plate is inclined to a ter
minating curved edge shown at I8 along an in
clined surface which I have indicated at I'I. The
tuyère plate I is relatively thin and is supported 45
tuyères constructed in accordance with my in
by a pair of depending side Walls of substantially
vention andv assembled in operating relation;
the same thickness as indicated at I2. The de
Fig. 2'is a longitudinal sectional view taken on - pending walls I2 each contain passages I3 ex
line 2--2 of Fig. l and illustrating the super
tending therethrough and terminate in end por
50 imposed relation> of the group of tuyère plates tions indicated at 15.
`
50
shown therein; Fig. 3 is a front end view of the
I provide a multiplicity of radially extending
group of tuyères illustrated in Figs. 1 and 2; -ribs I9 immediately beneath the tuyère plate I.
Fig. 4 is a bottom plan view of the tuyère plate The ribs I 9 are each formed on an angle as rep
of my invention; Fig. 5 is an end elevational view resented at 2U and are rounded to offer minimum
55 of the tuyère plate shown in Fig. 4; and Fig. 6 obstruction to the passage of air while guiding 55
2.
2,122,951
the~ air over a fan-shaped area in a confined
Zone immediately beneath the tuyère plate. For
purposes of additionally cooling the tuyère plate,
I provide apertures 2l in the horizontal portion
of the tuyère plate and between the sets of de
flecting plates or supporting ribs I9. The aper
tures 2l are so positioned that air is directed
upwardly immediately'against the lower surface
of the inclined plane portion I1 of the tuyère
plate immediately above. The inclined portion
I'I of the tuyère plate is Idirected toward the
horizontal portion of the lower adjacent tuyère
plate providing a confined zone 22 for the .pas
sage of air.
That is to say, a narrow zone is
15 provided for the distribution of air in a plane
substantially parallel with the plane of the tuyère
plate. The exit for air beneath the tuyère plate
is narrow in cross-sectional area immediately
above an adjacent lower tuyère plate through
20 which air is adapted to be forced ina blast di
rected against the lower surface of the inclined
portion I'I of the tuyère plate immediately above
the apertured tuyère plate. The radial position
of ribs I9 is such that air is distributed ina
25 fan-like direction from the tuyère plate. A pair
of ribs I9 extend adjacent each other on op
posite sides of the center line of the tuyère plate
and are symmetrically distributed beneath the
tuyère plate as shown more particularly in Fig.
.310
4. The ribs I9 are spacially related to form sub
stantially rectangular channels beneath the
tuyère plate. The channels established between
the ribs I9 are proportioned so that the trans
verse dimension thereof is not less than twice the
35 thickness of the adjacent ribs I9.
'The tuyère plates are readily superimposed
with respect to each other as illustrated in Figs.
1, 2 and 3 and may be individually replaced as
required. In order to explain the superimposed
relation of the plates, I have shown the sim
ilarly formed plates as identified by similarly
numbered reference characters having the sub
scripts a, b» and c applied thereto, that is to say,
the tuyère plate immediately below the tuyère
plate which has been described in detail ter
minates in a peripheral edge portion indicated at
IBa. 'I'he next adjacent lower tuyère plate ter
minates in a peripheral edge Ißb. The tuyère
plate beneath the last mentioned peripheral edge
50" is indicated at Ißc. As represented in Fig. 3, the
ribs of the severaltuyère plates I, Ia, Ib and Ic
are aligned with each other so that air is dis
tributed in zones substantially parallel with the
planes of the respective plates. The relatively
thin construction of the tuyère plates serves to
reduce cost in manufacture and facilitates cool
ing of the plates, thereby maintaining the oper
ating temperature of the plates relatively low.
The improved distribution of air` obtainable
plates to maintain the plates relatively cool. The
advantages of the elongated slots I0 are that
should one end of the slots become plugged, the
other end ordinarily tends to remain open and
enables the plugged portion to» be blown open 0r 5
blown free of any packed or accumulated matter.
The fact that the width of the channels be
tween the ribs I9 is never less than twice the
thickness of the adjacent rib I9 insures a wide
aperture beneath the plate which tends to act in 10
a self~cleaning manner in case it does become
clogged. The recirculation of cooling air cur
rents maybe maintained through the passages
I3, Ill, 2 and 2| insuring the maintenance of
safe temperatures under operating conditions of 15
the tuyère plates. The fact that blasts of air
are directed immediately adjacent the lower sur
face of the peripheral portion I8 of the tuyère
plate increases the protection afforded to the ma
terial of the tuyère plate against the action of 20
excessive temperatures.
While I have described the tuyère plate of my
invention in that form which has proven very
practical and successful in actual use, I am fully
aware that modiñcations may be made in the 25
construction and arrangement of parts in the
tuyère plate of my invention. Accordingly, I
intend no limitations upon my invention except
as may be imposed by the scope of the appended
claims.
30
What I claim as new and desire to secure by
Letters Patent of the United States is as follows:
l. A tuyère plate comprising a plate member
having, in its operative position, a substantially
flat top portion and a downwardly inclined 35
curved peripheral portion, a multiplicity of air
directing members relatively angularly disposed
immediately beneath the inclined portion of said
plate for directing air in a substantially fan-like
zone beneath said plate in approximately rectan 40
gular shaped channels, and side walls for sup
porting said plate, said plate having passages ex
tending therethrough normal to the flat portion
thereof and between said air directing members,
and the flat portion of said plate having a pair 45
of arcuate shaped passages therethrough.
2. A tuyère plate comprising a casting having,
in its operative position, a pair of depending side
portions and a relatively ñat top portion terminating in a curved portion, a downward inclined 50'.
portion extending from said curved portion and
terminating in a curved edge formed on a dif
ferent center, a plurality of relatively angularly
disposed air directing members disposed beneath
said flat top portion and said inclined portion
and deñning approximately rectangular channels
for air beneath said plate having a transverse
width not less than twice the lateral thickness
Vof said air directing members, said top portion
having passages for air extending therethrough
The elongated slots I9 normal thereto and between said air directing 610
co. with the tuyère plates of my invention insures a
more `uniform ñrebed.
and apertures 2l tend to maintain a balanced air
pressure under the i'lrebed. As indicated in Fig.
l, the slots Ii] in a lower tuyère plate of an as
6,5. sembly are disposed substantially in coincidence
with a number vof the apertures ZI in the next
upper plate so that air pockets are prevented from
members and a pair of segmental shaped pas
sages therethrough.
3. A tuyère plate comprising a plate member
having, in its operative position, a substantially
nat top portion and a downward inclined curved
peripheral portion, a multiplicity of air directing
accumulating and causing overheating. Com Vmembers relatively angularly disposed immedi
plete circulation of air behind and substantially ately beneath the inclined portion of said «plate
7.0i parallel to the exposed portions of the tuyère for directing air in a substantially fan-like Zone
p_lates is thus, assured, as well as more positive beneath said plate in approximately rectangular
distribution/aty equalpressure of `air fed from shaped channels, and side walls for supporting
the tuyère plate. VIn addition, in case the air said plate, said plate having passages extending
passages between ‘the ribs I9 become plugged, air therethrough normal to the ñat portion thereof
7f3». is permitted to be forced> up between the tuyère and between said air directing members, and the
3
2,122,951
flat portion of said plate having an elongated
passage for air extending therethrough on one
‘ side of the central longitudinal axis thereof in
termediate the respective side wall and said axis
and adjacent the inner ends of a predetermined
number of said air directing members.
4. A tuyère plate comprising a casting having,
in its operative position, a pair of depending side
portions and a relatively ñat top portion termi
nating in a curved portion, a downward inclined
portion extending from said curved portion and
terminating in a curved edge formed on a dilïer
ent center, a plurality of relatively angularly dis
posed air directing members disposed beneath
15 said flat top portion and said inclined portion
and defining approximately rectangular channels
for air beneath said plate having a transverse
width not less than twice the lateral thickness
of said air directing members, said top portion
20 having passages for air extending therethrough
normal thereto and between said air directing
members, and elongated passages for air extend
ing therethrough adjacent the inner ends of the
relatively angularly disposed air directing mem
25 bers.
5. A tuyère plate comprising a plate member
having, in its operative position, a substantially
flat top portion and a downward inclined curved
peripheral portion, a multiplicity of air directing
30 members relatively angularly disposed immedi
ately beneath the inclined portion of said plate
for directing air in a substantially fan-like zone
beneath said plate in approximately rectangular
shaped channels, and side walls for supporting
35 said plate, said plate having passages extending
therethrough normal to the flat portion thereof
and between said air directing members, and the
flat portion of said plate having elongated pas
sages for air extending therethrough and dis
40 posed on opposite sides of the longitudinal cen
tral axis of said plate and extending adjacent
the inner ends of the air directing members.
6. A tuyère plate comprising a casting having,
in its operative position, a pair of depending
45 side portions and a relatively flat top portion
terminating in a curved portion, a downward in
clined portion extending from said curved por
tion and terminating in a >curved edge formed
on a different center, a plurality of relatively
angularly disposed air directing members dis
posed beneath said flat top portion and said in
clined portion and defining approximately rec
tangular channels for air beneath said plate hav
ing a transverse width not less than twice the
lateral thickness of said air directing members,
said top portion having passages for air extend
ing therethrough normal thereto and between
said air directing members and having elongated
passages for air extending therethrough and dis
posed on opposite sides of the longitudinal cen
tral axis of said plate, and extending from posi 10
tions adjacent the respective depending side por
tions to positions adjacent the central axis of said
plate at the inner ends of the air directing
members.
7. In combination, at least two tuyère plates
each comprising a casting, having in operative
position, a flat top portion and an inclined lip
portion extending from said top portion and
terminating in a curved edge, s-aid lip portion
having the under surface thereof inclined paral 20
lel to the upper surface thereof, a plurality of
relatively angularly disposed ribs beneath the
casting for directing air outwardly under the
inclined lip portion; said plates being arranged
in superimposed, longitudinally relatively dis 25
placed position, and the lower one of said plates
being apertured in the ñat top portion thereof
between adjacent ribs and beneath the inclined
lip portion of the upper one of said plates.
8. In combination, at least two tuyère plates 30
each comprising a casting, having in operative
position a flat top portion and an inclined lip
portion extending from said top portion and
terminating in a curved edge, said lip portion
having the under surface thereof inclined paral
lel to the upper surface thereof, a plurality of
relatively angularly disposed ribs beneath the
casting for directing air outwardly under the in
clined lip portion; said plates being arranged in
superimposed, longitudinally relatively displaced
40
position, and having apertures in the iiat top
portions thereof between adjacent ribs, the aper
tures in the lower one of said plates being dis
posed beneath the inclined lip portion of the
upper one of said plates, and the lower one of
said plates having elongated apertures on either
side of the longitudinal central axis thereof sub
stantially in alignment with a number of the
aforesaid apertures in the upper one of said
plates.
50
WILLIAM A. RIDDELL.
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