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Патент USA US2134871

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Nov; '1, 1938.
Filed Feb. 24, 1936
Wade B. Graham
46, m
Patented Nov. 1, 1938
Wade B. Graham, Houston, Tex.
Application February 24, 1936, Serial No. 65,241
2 Claims. (Cl. 158‘--3)
This invention relates to oil burning locomo
the letter B the lower portion of the ?re box of
tives and to mechanism embodying steam gener
the locomotive commonly called a ?re pan. The
ating units of similar construction, and is par
?re pan B comprises a sheet metal shell consisting
ticularly concerned with an improved ?re box of a rectangular structure It and of a plate I I
5 construction.
supported in the bottom of the structure 10 by
In the construction of oil burning locomotives, means of ?anges l2. The plate II, which con~
it is conventional to equip the ~?re boxes with stitutes the draft bottom of the ?re box, is con—
draft bottoms formed with a single opening lo
structed with a large opening l3 adjacent the
cated adjacent the wall opposite the fuel nozzle. rear Wall of the ?re box and with a plurality of
This opening is made of a size to permit the en
smaller openings Ill arranged between the large 10
trance of a su?icient amount of air to effect e?i
opening i3 and the forward end of the box. The
cient combustion when the throttle is open and large opening [3 is surrounded by an upwardly
a forced draft maintained by the steam exhausted
extending metal structure I5 consisting of a plu
from the engine cylinders, and is so positioned rality of suitably shaped angle irons, and mounted
15 that it effects the proper distribution of the air
in each of the apertures M there is an upstanding
under such conditions. Such opening does not, tube 16. The fire box is lined with ?rebricks ll,
however, permit the entrance of a sufficient
except for that portion of the bottom which is
amount of air to effect e?icient combustion, or occupied by the tubes [6. This portion of the
act to properly distribute the air when the throt
bottom is lined with a layer of ?re-proof cement
20 tle is closed or but slightly open and a much
[3 which ?lls the spaces between the tubes [6.
smaller draft maintained by a steam blower. The
At the forward end of the ?re box, there is a
ine?icient combustion resulting under the latter ?ooring C which closes the opening between the
conditions causes the formation of carbon on the ?re box and the adjacent wall of the boiler. This
draft bottom, the emission of gas into the engine ?ooring comprises a sheet metal plate [9 sup
cab, the production of internal explosions re
ported in place by angle members 20 and covered 25
sulting in ?ashes of ?re being expelled into the with ?rebrick ll.
cab through the ?re door, and the loosening of the
The forward wall of the sheet metal structure
brick in the ?re box.
II] is formed with an aperture 2! and the bricks
It is an object of this invention to provide a
30 ?re box construction which will result in the
elimination of the above named objectionable fea
tures in locomotives, and which may be employed
in mechanisms embodying similar steam gener
ating units to effect a like result.
The invention will be best understood from the
description of one practical embodiment thereof,
illustrated in the accompanying drawing, in
Fig. 1 is a perspective view of a draft bottom for
40 a ?re box of the type contemplated by this inven
Fig. 2 is an enlarged fragmentary section of the
member illustrated in Fig. 1 taken through one of
the upwardly extending tubes; and
Fig. 3 is a longitudinal sectional view of the
lower portion of a ?re box embodying the present
invention, the rear lower portion of the boiler
being illustrated in dot and dash lines.
The ?re box illustrated in the drawing is de
signed for use in a conventional locomotive of the
type in which the ?re box is located at the rear
of the boiler and communicates with the smoke
stack through the ?ues of the boiler.
Referring to Fig. 3, the letter A indicates the
55 rear bottom portion of the boiler of a locomotive;
at that end of the ?re box separated so as to
provide an opening into the interior of the ?re
box for a fuel injection nozzle 22. The nozzle
22 is of a steam actuated injection type, and is
fed with oil from a pipe line 23 and with steam
from a pipe line 24. The flow of steam and oil
through the pipe lines 23 and 24 is controlled in
the usual manner by means of manually operated
valves located in the engine cab.
During the operation of the engine, fuel is
injected into the ?re box B in the direction of
the rear wall which, in the parlance of the art, is
‘called, a flash wall in that it is maintained at a
white heat capable of igniting the fuel. The in
jected fuel burns within the ?re box, air being
supplied by way of the opening l3 and the tubes
it. The gases of combustion pass upwardly and
forwardly into the boiler flues and from there into
the forward compartment of the engine where
they are expelled through the smoke-stack.
During the periods when the engine throttle is
open, a forced draft is maintained through the
?re box as a result of the steam exhausted from
the engine cylinders being expelled through the
smoke-stack. This forced draft is eliminated
when the throttle is closed, and is ineffective with
a slight opening of the throttle. At such times, a 55
steam blower mechanism arranged to create an
auxiliary forced draft is opened. The steam pass
ing through the blower mechanism produces a
much smaller depression at the forward end of
What is claimed is:
1. A ?re box for locomotives comprising a ?re
pan, said pan including front, rear and bottom
Walls, ?re brick on said front and rear walls,
the boiler flues than the exhaust steam when the
said bottom wall having a draft opening sub
throttle is open, and in locomotives in which the
?re boxes are equipped with conventional draft
bottoms having a single opening, ine?icient com
bustion results from insufficient air being drawn
stantially across the end adjacent said rear wall,
and also having a plurality of additional air in
lets, each of said inlets being of less area than
said opening and said inlets being distributed
into the ?re box and from improper distribution
of the indrawn airv This insu?icient combustion
results notwithstanding that the fuel supply is
reduced, as is done when the throttle is main
burner in said forward Wall to direct a spray of
fuel along the ?re box across said inlets and
against said rear wall, said inlets serving to ad
tained closed or in a nearly closed position for
15 substantial periods of time, and causes the ob
jectional features previously set forth, including
the production of dangerous explosions. With a
draft bottom of the type herein described, ef?cient
combustion is maintained during periods in which
20 the throttle is closed, both with a normal fuel
supply and with a reduced fuel supply, notwith
standing that there is a lessened tendency to
draw air into the ?re box. This maintenance of
e?icient combustion results from the draft bottom
25 being formed with a large number of openings
arranged to provide more equal distribution of
the air entering the ?re box, and from the mixing
of the air with the fuel produced by the jets of
air entering through the tubes l6.
over said bottom wall, and a liquid fuel spray '
mix air with and assist in vaporizing the fuel
before it reaches said rear wall.
2. A fire box of the character described com
prising a box portion having front and rear walls
and a substantially horizontal base, ?re brick
linings on said walls, said base having an elon
gated draft opening at one end thereof, a plu 20
rality of small upstanding air inlet tubes extend
ing through and distributed over the base of said
box to provide for distribution of air admitted to
said box, said base including a body of refractory
cement surrounding said tubes, and means to in 25
ject liquid fuel into said box across said air inlets
and over said elongated draft opening.
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