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Патент USA US2112954

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April 5, 1938.
G. J. CHRISTENS‘ON
' 2,112,954
LOCOMOTIVE FIREBOX
Filed June 13, 1956
?zzy-W.
44%
"6
0265072‘,
Patented Apr. 5, 1938
2,112,954
UNITED STATES
ATENT OFFICE
2,112,954
LOCOMOTHVE FIREBOX
Gust J. Christensen, Chicago, IlL, assignor to
Locomotive Firebox Company, Chicago, 111.,
a corporation of Delaware
Application June 13, 1936, Serial No. 85,064
8 Claims. (Cl. 122-68)
This invention relates to improvements in loco
side sheets 9-—9, top sheet I0, back sheet II and
motive ?reboxes and it consists of the matters front throat sheet 12. Portions of the back
hereinafter described and more particularly sheets 8 and I 1 respectively are formed to provide
pointed out in the appended claims.
a fuel door opening l3.
‘
This invention is more particularly concerned
Several of the sheets mentioned coact to form
on
with ?reboxes equipped with a thermic syphon, the side water legs l4, back water leg I5 and front
of the type which is a substantially rigid water, throat IS respectively, all bottomed by a mud
steaming and circulating element that opens at ring ll. The above is typical of a conventional
its ends through certain sheets of the ?rebox at locomotive boiler rear end structure and requires
no further description except to say that com
10 different elevations, for the purpose of increas
ing the effective heating surface area of the ?re
panion sheets are suitably stay-bolted.
box whereby a better water steaming and circu
The ?rebox herein shown is equipped‘with a so
lating action is possible.
called thermic syphon I8 which is a substantially
One of the objects of the present invention is rigid but hollow Water steaming and circulating
“ to provide means in a syphon equipped ?rebox
element having ends that open through certain
whereby additional water steaming and circu
sheets of the ?rebox at different elevations.
lating e?iciency and a better support for the arch When a plurality of such syphons are employed
brick is obtained.
in the ?rebox, they are spaced laterally from each
Another object of the invention is to provide a other.
In the present instance, only one syphon is em
20 ?rebox of this kind, wherein water is taken from
the front throat and at points along each side ployed and this is disposed in the longitudinal
water leg and is discharged above the crown sheet medianplane of the ?rebox. Such a syphon in
at points therealong in a manner assuring a con
tinuous ?ooding of the same with water, even
25 though the water level in the boiler falls below
normal.
A further object of the invention is to provide
a tube arrangement in a locomotive type of ?re
box, which coacts with the syphon in forming a
30 better support for the brick of the arch and at
the same time employs longer tubes of a peculiar
shape that gives them more ?exibility to accom
modate sheet movement.
The above mentioned objects of the invention
as well as others, together with the advantages
thereof, will more fully appear as the speci?ca
tion proceeds.
In the drawing:
Fig. l is a longitudinal vertical sectional View
through a locomotive boiler embodying the pre
ferred form of the invention.
Fig. 2 is a transverse vertical sectional View
through the same as taken on the line 2-2 of
55.
Fig. 1.
Fig. 3 is another and fragmentary transverse
vertical detail sectional View through a part of
the ?rebox as taken on the line 3-45 of Fig. 1.
Referring now in detail to that embodiment of
the invention illustrated in the accompanying
drawing, 5—5 indicate the side sheets of the ?re
box, and 6 indicates the crown-sheet thereof. 1
indicates the front or ?ue sheet thereof and 8
indicates the back sheet thereof. It will be under
stood that the ?rebox is positioned in the rear
end of the boiler shell, which includes the outer
‘
5
10
15
this instance includesla substantially ?at, tri
angularly shaped body l9 having an outwardly
?ared ?ange 2|! at the top that ?ts and is welded 25
in a longitudinally extending elongated opening
in the crown sheet. This body has an inclined
bulged bottom 2! which extends downwardly and
forwardly to terminate in a tubular inlet neck ex
tension 22 that opens through the bottom portion 30
of the front sheet ‘I so as to communicate with
the» front throat H3. The body which is closed
at its front and rear ends is suitably staybolted
to resist internal pressures.
t is apparent that
the syphon presents a considerable surface area. 35
In the operation of the boiler in which the syphon
is installed, water is drawn in from the throat l6
and a part thereof is generated into steam, the
steam and hot water being discharged into the
boiler water and steam space of the boiler above 4:0
the crown sheet. In this discharge of water, the
same operates to ?ood the crown sheet. By
reason of the difference in thermic heads, a ‘vig
orous water circulating action is established in
the boiler.
45
The syphon described, substantially divides the
?rebox longitudinally into two laterally spaced
combustion chambers or passages both of which
communicate with the ?ues of the boiler. In
each chamber or passage is a set of circulator 50
tubes 23, each comprising a plurality. of longi
tudinally spaced tube elements, the elements in
one set' on one side of the syphon being arranged
in the transverse plane of the el?m?nts of the
other set.
55
2
2,112,954
Each tube element includes an inlet portion 24,
ments 23 from longitudinal spaced points in each
an outlet portion 25 and intermediate connect
ing portion 25 of reverse curve formation on the
order of an ogee or bulge. The inlet portion has
an extremity 2'! arranged at a right angle to the
water leg, a continuous and vigorous circulation
is established in the side water legs which washes
the water side of the sheets clean of any solids
plane of the associated side sheet. This extrem
ity which extends at a right angle to the plane of
the side sheet is ?xed in said side sheet and
merges into the inlet portion 24 by a short
10 curved portion 28. The inlet portion 24 extends
upwardly and inwardly from the curved portion
28 at an angle which corresponds to the angle
tending to adhere thereto. Also due to the tur
bulence set up by the circulating action, the solids
remain in suspension and cannot readily settle
out to accumulate as a mud upon the mud ring
which bottoms the various water legs.
By reason of the circulation thus produced 10
through the side Water legs, the expansion and
contraction stresses in the ?rebox sheets are
equalized and the life of the same is greatly
of transverse inclination of one side of the arch
which will be referred to later. The crown
sheet 6 is arched or curved transversely of the
?rebox and the outlet portion 25 of the tube ex
increased.
The tube elements 23 are preferably made of 15
seamless tubing and may be readily bent to shape.
tends radially with respect thereto and opens
As the curves therein are of a relatively large
through and is ?xed in any suitable manner in
radius, the danger of cracking in shaping the
said crown sheet.
tubes is avoided. Also, such curves permit a
ready wash-out of the tubes.
20
Cross reference is hereby made to applicant’s
As herein shown, the intermediate portion 26
of each tube element 23 comprises upper and low
er reversed curved parts and the lower part is so
disposed as to be spaced substantially close to
the associated side of the syphon body. The tube
elements in each set are of successively increas
ing heights, from the rear to the front of the
?rebox. This di?erence in heights is such that a
line extending between the points where the inlet
portions of the tube elements in each set, open
through the associated side sheet, is disposed in
an inclined plane substantially conforming to the
plane of inclination of the bulged bottom 22 of
the syphon body and its neck extension.
The structure described is ‘admirably adapted)
35 to the support of an arch indicated as a whole as
at 29 in Fig. 2.
This arch is made of transverse
rows of brick, each including an outer end brick‘
30, an inner end brick 3| and intermediate brick
32. The outer end’ and intermediate brick 3i!)
and 32 are curved transversely of the plane of
the respective row while the inner end brick is
?at. The outer end and intermediate brick each
has a concaved corner to rest upon upper parts of
the inlet portions of the tubes. The outer end
of the outer brick in each row engages against
the associated side sheet. The inner end of each
inner end brick is cut away to permit it to pass
the curved parts 26 of the tubes. Furthermore,
the inner end of each inner end brick is formed
with a shoulder to engage upon the body bottom
bulge 2! and inlet neck 22, respectively.
In the outer side sheets 9 of the boiler in line
with the inlet end extremity 21 of the various
tube elements, are wash-out plugs 33 and in the
top sheet it) of the boiler shell are wash-out plugs
34 in line with the outlet ends of the various cir
culator tube elements 23.
In the operation of the boiler of which the
?xebox forms a part, the syphon operates to take
150 in boiler water from the front throat and to dis
charge it out through its top end, thus keeping
the crown sheet ?ooded with water.
Also, due
to the presence of the sets or banks of circulator
tubes, water enters the inlet ends of the various
tube elements at spaced points along each side
water leg l4. Under the action of heat transfer
from the products of combustion to the water in
the tube elements 23, a part of the water is gen
erated into steam to pass into the boiler above
the water therein and the remainder of said wa~
ter is discharged out through the outlet ends to
assist the syphon in keeping the crown sheet
?ooded to increase the safety factor under low
water conditions.
As water is taken into the various tube ele
75
co-pending application S. N. 85,063 which claims
certain of the subject matter herein disclosed,
but not claimed herein.
While in describing the invention, I have re 25
ferred in detail to the form, arrangement and
construction of the parts thereof, this is to be
considered only in the illustrative sense so that I
do not wish to be limited thereto except as
may be speci?cally set forth in the appended 30
claims.
'
I claim as my invention:
1. A locomotive ?rebox embodying therein a
crown sheet, a front sheet and side sheets, a
substantially rigid water steaming and circulat
ing element in the ?rebox having ends which
open through certain of the sheets of the ?rebox
35
at different elevations, and a circulator tube ar
ranged on each side of said element and extend
ing transversely of the ?re box, each tube includ 40
ing an inlet portion opening through an asso
ciated side sheet and an outlet portion opening
through the crown sheet and a reversely curved
intermediate portion connecting said inlet and
outlet portions, said reversely curved portions 45
being arranged relatively close to the sides of
said element and being spaced closer together
than the outlet portions of both tubes where they
open through the crown sheet.
2. A locomotive ?rebox embodying therein a 50
crown sheet, a front throat and side sheets, a sub
stantially rigid water steaming and circulating
element in the median plane of the ?rebox hav
ing ends which open through certain of the sheets
of the ?rebox at di?erent elevations, sets of cir 55
culator tubes in and arranged transversely of
the ?rebox, with one set arranged on each side
of the water steaming and circulating element
and each set comprising a plurality of tube ele
ments arranged in transverse planes, spaced lon 60
gitudinally of the ?rebox, each tube comprising
an inlet portion opening through an associated
side sheet and an outlet portion opening through
the crown sheet and a reversely curved inter
mediate portion connecting said inlet and outlet 65
portions, the reversely curved portions of the
tubes in each set being arranged substantially
close to the sides of said element, said last men
tioned portions of the tubes in both sets being
spaced closer together than the outlet portions 70
of the tubes in both sets where they open through
the crown sheet.
3. A locomotive ?rebox embodying therein a
crown sheet, a front sheet and side sheets, a
substantially rigid water steaming and circulat 75
2,112,954
3
ing element in the median plane of the ?rebox
having ends which open through certain of the
sheets of the ?rebox at different elevations, sets
spaced longitudinally of the ?rebox, each tube
including an inlet portion, the inlet portions of all
of circulator tubes in the ?rebox, with one set
arranged on each side of the water steaming and
‘circulating element and each set comprising a
ated side sheet in a plane substantially corre
plurality of tube elements arranged in transverse
planes spaced longitudinally of the ?rebox, each
tube comprising an inlet portion opening through
10 an associated side sheet and an outlet portion
opening through the crown sheet and a curved
intermediate portion connecting said inlet and
outlet portions, and a ?re arch composed of
brick supported in part by said water steaming
15 and circulating element and in part by said circu
lator tubes.
4. A locomotive ?rebox embodying therein a
crown sheet, a front sheet and side sheets, a sub
stantially rigid water steaming and circulating
20 element in the median plane of the ?rebox hav
ing ends which open through certain of the
sheets of the ?rebox at different elevations, sets
of circulator tubes in the ?rebox, with one set
arranged on each side of the water steaming and
circulating element and each set comprising a
plurality of tube elements arranged in transverse
planes spaced longitudinally of the ?rebox, each
tube comprising an inlet portion opening through
an associated side sheet and an outlet portion
opening through the crown sheet and a curved
intermediate portion connecting said inlet and
outlet portions, and transverse rows of ?re brick
between and supported at least in part on the
inlet portions of adjacent tube elements in each
set and closing the space between the sides of
said water steaming and circulating element and
the respective side sheets.
5. A locomotive ?rebox embodying therein a
crown sheet, a front sheet and side sheets, a
substantially rigid water steaming and circulat
ing element arranged longitudinally of the ?re
box and having ends which open through certain
of the sheets of the ?rebox at different elevations,
a. set of circulator tubes arranged in and extend
ing transversely of the ?rebox on each side of the
the tubes in each set opening through the associ
sponding to the plane of the inclination of the
bottom of the said body and its neck extension,
each tube further including an outlet portion
opening through the crown sheet and a reversely
curved intermediate portion connecting said in
let and outlet portions, and means providing arch 10
portions between both sides of said elements and
said side sheets, said arch portions comprising
bricks, certain ones of which are supported solely
upon said inlet ‘portions of the tubes and others of
which are supported jointly upon said inlet por~ 15
tions of said tubes and upon portions of said ele
ment.
7. A locomotive ?rebox embodying therein a
crown sheet, a front sheet and side sheets, a water
steaming and circulating element in the ?rebox
and including a ?at hollow body arranged longi
tudinally of the ?rebox and opening through the
crown sheet, said body having a downwardly and
forwardly inclined bulged bottom that merges into
a tubular neck which opens through the throat 25
sheet of the ?rebox, a set of circulator tubes ar
ranged in the ?rebox on each side of the water
steaming and circulating element, each set com
prising a plurality of tube elements arranged in
transverse planes spaced longitudinally of the ?re 30
box, each tube including an inlet portion, the in
let portions of all the tubes in each set opening
through the associated side sheet in a plane sub
stantially corresponding to the plane of the in
clination of the bottom of the said body and its 35
neck extension, each tube further including an
outlet portion opening through the crown sheet
and a curved intermediate portion connecting said
inlet, and transverse rows of ?re brick between the
inlet portions of adjacent tube elements in each 40
set, the outer end of the brick in each row engag
ing an associated side sheet and the inner end of
the brick in certain of the rows engaging the bot
tom bulge of the body and the inner end of the
brick in certain other rows engaging upon the neck 45
water steaming and circulating element, each extension.
set of tubes comprising a plurality of tube ele
8. A locomotive ?rebox embodying therein a
ments arranged in transverse planes spaced,
crown
sheet, a front sheet and side sheets, a water
longitudinally of the ?rebox, each tube compris
ing an inlet portion opening through the side steaming and circulating element in the ?rebox
sheets, an outlet portion opening through the and including a ?at hollow body arranged longi
crown sheet and a reversely curved intermediate
portion connecting said inlet and outlet portions,
and means providing arch portions between both
sides of said element and said side sheets, said
arch portions comprising bricks, certain ones of
which are supported solely upon said inlet por
tions of said tubes and others of which are sup
ported jointly upon said inlet portions and upon
portions of said element.
6. A locomotive ?rebox embodying therein a
crown sheet, a front sheet and side sheets, a water
steaming and circulating element in the ?rebox
and including a ?at hollow body arranged longi
65 tudinally of the ?rebox and opening through the
crown sheet, said body having a downwardly and
forwardly inclined bulged bottom that merges into
a tubular neck which opens through the throat
sheet of the ?rebox, a set of circulator tubes ar
ranged in and extending transversely of the ?re
box on each side of the water steaming and cir
culating element, each set comprising a plurality
of tube elements arranged in transverse planes
tudinally of the ?rebox and. opening through the
crown sheet, said body having a downwardly and
forwardly inclined bulged bottom that merges into
a tubular neck which opens through the throat
sheet of the ?rebox, a set of circulator tubes ar
ranged in the ?rebox on each side of the water
steaming and circulating element, each set com
prising a plurality of tube elements arranged in
transverse planes spaced longitudinally of the
?rebox, each tube including an inlet portion, the 60
inlet portions of all the tubes in each set opening
through the associated side sheet in a plane sub
stantially corresponding to the plane of the incli~
nation of the bottom of the said body and its neck
extension, each tube further including an outlet
portion opening through the crown sheet and a
reversely curved intermediate portion connecting
said inlet and outlet portions, and transverse rows
of ?re brick between the inlet portions of adja
cent tube elements and extending from said body 70
to the respective side sheets.
GUST J. CHRISTENSQN.
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