Tube Steam Boiler.
Year: 1894

page_text: Date of Application, 26th June, 1894-Accepted, 11th Aug., 1894
COMPLETE SPECIFICATION.
Water Tube Steam Boiler.
I, LEONARD DELANO DAVIS, of the City of Erie, in the State of Pennsylvania,
U.S.A. Manufacturer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My invention relates to a construction of water tube steam boiler, as I shall
describe referring to the accompanying drawings.
Fig. 1 is a side elevation partly in section.
Fig. 2 is a transverse vertical section on the line x x of Fig. 1 looking in the
direction of the arrow.
Fig. 3 is a detail view illustrating the arrangement of the tubes.
Fig. 4 is a sectional detail view illustrating the arrangement of the tubes, so as
to form flues.
Fig. 5 is a sectional detail view illustrating a modified form of the tubes forming
the flues.
Fig. 6 is a side elevation, partly in section, of a modified construction on the
line s
yy
of Fig. 7 looking in the direction of the arrow.
Fig. 7 is a transverse vertical section of the same, on the line of Fig. 6
looking in the direction of the arrow.
The principal objects of my invention are so to arrange the water tubes that they
form a series of flues, through which the products of combustion pass on their way
to the chimney and to connect the tubes forming these flues to suitable pipes or
drums, so as to ensure adequate circulation of the water.
Referring first to Figs. 1, 2, 3 and 4, A A are the side walls, B the front, B' the
rear, and C the top of the boiler setting; C' the opening for the chimney, D
the fire bars, J the fire box and D' the ash pit, all of which parts are of ordinary
construction.
Behind the ash pit D' I place a transverse drum E and to the rear side of this
drum are secured horizontal communicating pipes or headers F and F¹ which extend
back to the rear of the boiler setting.
From the ends of this drum E preferably outside of the boiler setting A extend
vertical pipes E¹ E¹ to a steam drum E2, and to the front side of this drum are
secured horizontal headers G' which extend forward to the boiler front B, and
correspond in number and size with the headers F and F.
These headers F and G are connected together by tubes ff which form the sides
of the fire box J. The intermediate headers F' and G¹ are connected together by
means of groups of tubes arranged so as to form flues I I' and I through which the
products of combustion pass from the fire box J to the chimney C¹.
The tubes ab and c hent as shewn fit together and form the upper and lower
walls of the rectangular flues I I' and I2, the partitions between which are formed
by the tubes & and e.
From the lower bends H downwards and from the upper bends H' upwards
the tubes a b c d and e stand parallel one behind the other, so that the products
of combustion pass from the fire box J between them freely until they reach the
lower bends H whence the products of combustion pass onwards through the
flues I, I¹ and 12, until they reach the upper bends H whence they pass upward
freely between the parallel portions of the tubes H' and out between the headers G₁
to the chimney C¹.
The heat is thus thoroughly distributed over all portions of the water tubes, which

page_text: operate as the upflow tubes of the boiler, the large pipes E E' at the sides operating
for downflow.
Fig. 5 shews a modified construction of the tubes which form the flues of the
boiler, by which construction a less number of tubes are required the boiler
remaining otherwise the same as that described.
Figs. 6 and 7 illustrate a modified construction of the boiler in which the lower
drum E is omitted the lower headers F2 being simply placed side by side upon
supports L and L' and instead of the upright pipes EE shewn in Fig. 2 a number
of curved pipes M extend from the bottom of the upper transverse drum E
behind the tubes to the rear ends of the headers F2 one into each header.
The water tubes a and c are in this case omitted from the lower flue wall
leaving the tubes which form the vertical partitions open to the fire-box of which
the flue-wall K' forms the top, so that there are only two flues I and I² through
which the products of combustion pass from the rear of the boiler to the chimney C.
The row of tubes forming the upper wall K2 of the upper flue 12 at their lower
ends pass down close beside each other forming a complete wall nearly to 'the
headers F², then they diverge a little to enter the headers F2.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A steam boiler having water tubes extending vertically upwards, then bent
and inclining upwards, again bent and extending vertically upward from headers at
the rear of a fire-box to headers at the front of a drum above the fire box, so as to
form the walls of a series of flues, along which the products of combustion pass
from the rear of the fire box to the chimney, substantially as described.
2. In a water tube boiler such as is above referred to in combination with the
water tubes the upper drum and its headers, a lower drum from which the lower
headers project and vertical downflow pipes connecting the ends of the two drums,
substantially as described with reference to Figs. 1 and 2.
3. In combination with the water tubes the upper drum and its headers, the
lower headers and a bent downflow pipe connecting each header to the upper drum,
substantially as described with reference to Figs. 6 and 7.
Dated this 26th day of June 1894.
ABEL & IMRAY,
Agents for the Applicant.