Improvements in Steam Boilers.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
DAVID LUCIFER MARTYN, Engineer, Glen Street Works, Hebburn-on-Tyne, do
hereby declare the nature of this invention to be as follows:-
Accompanying this specification is a drawing showing a front end view. Refer-
ing to the drawing: The shell A may be made of one or more pieces. In
shape, it is neither round nor square yet has four flat sides. In these sides there
are suitable holes, into which tubes are fitted. These tubes marked D, D', 1)², D³
and so on, I call diagonal tubes. There are also a number of tubes placed at right
angles to these diagonal tubes, the ends of which are marked H, H1, H2, H3 and
so on. The tubes, H, H¹, H2, H3 and so on, I call horizontal tubes. My boiler
may be set on brickwork or on a water tank in the manner shown on the drawing
and marked T and may be fired by coal, coke, oil or the like, and it may have one
or more fuel doors fitted. One such door is shown on the drawing accompanying
this specification and marked F. Firebars are arranged in the usual way, upon
which the fire rests. The flames and hot gases find outlet from the furnace in
the following manner, i.e.:-A portion go right along to the back end of the
boiler (which is covered by brickwork or ironwork forming a flue or combustion
chamber) and through the horizontal tubes, thence up the chimney.
Other portions go through the diagonal tubes into side flues marked on the
drawing SF and SF, thence from the side flues direct into the chimney.
Dated this Seventeenth day of October 1898.
DAVID LUCIFER MARTYN,
Applicant.
Improvements in Steam Boilers.
I, DAVID LUCIFER MARTYN, Engineer, of Glen Street Engine Works, Hebburn-
on-Tyne, in the County of Durham, 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 steam boilers of that type consisting of a flat sided
shell set diamondwise or with one of its diagonals vertically over the fire and
having two series of diagonal, and one series of horizontal fire or smoke tubes
connecting with and staying the opposite sides and the ends of the shell respec-
tively, the three series further communicating with flues or chambers that direct
the course of the flames and hot gases. According to a recent construction, the
two diagonal series of tubes communicate with the fire and separate side flues or

page_text: chambers that open into an end flue or chamber with which and the uptake or
chimney the horizontal series of tubes communicate. Thus the flames and hot
gases first pass up the diagonal tubes into the side chambers, thence into the end
chamber whence they escape through the horizontal tubes to the uptake or
chimney.
The great difficulty of obtaining the necessary draught is one of the chief draw-
backs to this type of boiler, this (as proved to me by various experiments I have
made at great cost) being due to the tortuous path that the flames and hot gases
have to follow to reach the uptake or chimney.
It is with the object of obviating the above mentioned disadvantage that. I
have devised my invention which consists in so arranging the flues or chambers
connecting with the fire or smoke tubes that the flames and hot gases follow a
less impeded course than in the present constructions.
I will fully describe my invention in reference to the accompanying drawings
which show several views of a boiler constructed in accord with it and suitable
for a motor road vehicle. Of these views, Fig. 1 is a side elevation, Fig. 2 is
a back end elevation, Fig. 3 is a vertical central longitudinal section and Fig. 4
is a transverse section on the line Y-Z in Fig. 3.
A is the boiler shell constructed of more or less rectangular section and set
as usual with one diagonal vertically over the furnace B so that it is supported
at the other or horizontal diagonal.
+
:
The shell is constructed in the way well known to boiler makers, and its upper
part is shaped, as shown, to constitute the steam receiver or dome.
The walls of the furnace B may be of brickwork, or metal, and upon them the
shell A is supported at both sides. According to the illustrations, the furnace
wals are of iron or steel plates and the furnace is enclosed in a feed water tank C
to which the shell and furnace are riveted or bolted and the whole fixed in posi-
tion by angles D, D and E, E secured to the tank C, and shell A and to girders
which, in a motor road vehicle, may form part of the framing. The fire hole is
formed as shown at F, Fig. 3.
The tank arrangement is very convenient as the feed water is heated prior to
use with the resulting benefit, but to prevent it forming steam and thereby
becoming dangerous, tubes G, G are fitted to and extend between the ends of the
tank as indicated in Figs. 2 and 4, the tubes being open to the atmosphere so
that air. can circulate through them for cooling the water which is delivered into
the shell A by a pump or otherwise appropriately. The water is fed to the tank
in any suitable way.
H, I and J are the fire or smoke tubes, the three series being arranged and
fitted in the known manner as represented in Figs. 3 and 4.
K and L are the side flues into which the upper ends of the diagonal tubes H
and I communicate respectively. The flues are suitably connected to and run the
length of the shell A and are closed at the rear ends by the shell back end plate,
but open into the chimney M at the front.
N is the end flue built in the form of a combustion chamber or a continuation
of the furnace B and with it communicate the back ends of the horizontal
tubes J, J whose front ends open into the chimney M. This chamber or flue N
may be of brick or metal; the latter construction is exemplified.
It will be seen that the side flues K and L, instead of communicating indirectly
with the uptake or chimney M as heretofore, communicate directly with it like the
end fluc N which also, instead of being separate from the furnace as previously,
forms part of same.
When the boiler is in use, part of the flames and hot gases resulting from the
fire on the furnace grate pass along the furnace B to the chamber or flue N and
thence through the tubes J, J to the chimney M. The remaining portion of the
flames and hot gases go through the tubes H and I into the side flues K and L
whence they escape into the chimney M. Thus the necessary draught is easy to
obtain as I have proved by actual practice.

page_text: I have shown the fire hole at the same end of the boiler as the chimney M but
it may be made in the chamber or flue as indicated by the dotted lines at F¹,
Fig. 3, the flames and hot gases passing through the series of tubes H, I and J as
before.
Also, instead of the single large furnace shown, there may be two smaller ones,
the chamber or flue N being common to both, or divided to suit as desired.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. A steam boiler arranged, constructed and adapted for use, substantially as
described in reference to the accompanying drawings.
2. In steam boilers of the type referred to, arranging the side flues or chambers
connecting with the diagonal series of fire or smoke tubes to communicate
directly with the uptake or chimney, and forming the end flue or chamber con-
necting with the horizontal series of fire or smoke tubes as a continuation of the
furnace or furnaces, substantially as described in reference to the accompanying
drawings and for the purpose set forth.
3. The use in combination with a boiler of the type referred to, of a feed water
tank enclosing the furnace or furnaces whereby the water is heated before delivery
to the boiler, substantially as described and shown in the accompanying drawings.
Dated this 17th day of August 1899.
ΤΟΥ The Applicant,
J. A. HARVEY,
Chartered Patent Agent, 3, St. Nicholas' Buildings, Newcastle-on-Tyne.
J. A. HARVEY,
Chartered Patent Agent, 3, St. Nicholas' Buildings, Newcastle-on-Tyne.