Year: 1896

page_text: I, JIRO MIYABARA, I.J.N., of 1 Eliot Hill, Lewisham, in the County of
London, Naval Constructor, do hereby declare the nature of this invention to be
as follows:-
This invention has for its object to provide a simple, convenient and efficient
water tube boiler in which there shall be an effective circulation of water and steam
and which is so constructed as to permit of easy access for examining and cleaning
all the important parts of the boiler. both internally and externally, and for
removing and replacing any tube of the boiler whilst leaving the rest of the boiler
in a workable condition.
My improved boiler comprises two water walls arranged to form the front and
bark of a combustion chamber and each composed of horizontal cylindrical vessels
arranged one above another and connected together by interposed flanged junction
boxes or by short vertical tubes and the upper of which serves as a steam
drum, the two walls thus constructed being connected by sets of diagonal or
inclined heating tubes that extend across the combustion chamber above the fire
grate, there being provided within the water vessels, except the top and bottom
ones, diaphragms or deflectors that are arranged opposite the open ends of the
inclined heating tubes so as direct the streams of water and steam. arriving
from the upper ends of lower groups of tubes into the lower ends of the next
upper groups of tubes and thereby permit the remaining portions of the water
walls to act as downtakes.
The boiler can be made either single or double ended and is suitable for marine
or land service.
In the accompanying drawings, Fig. 1 is a cross section and Fig. 2 a front
elevation, with a part broken away, showing a single ended water tube boiler
constructed according to this invention and suitable for mariue purposes. Figs. 3
and 4 are enlarged detail views.
A, A.... A are horizontal cylindrical vessels arranged one above the other
and connected together by interposed flanged junction boxes B, B'...
form a front water wall to the boiler. C, C'.. C' are similar horizontal cylindrical
vessels connected together by interposed flanged junction boxes D, D'... D³ so as
to form a rear water wall. The portion of the circumference of each vessel A... A',
C.... C opposite a junction box B... B³, D... D³, is formed with a series of
slits or holes A*, C* respectively so as to place the several vessel in each vertical
row in free communication with each other through the interposed junction boxes.
The vessels comprising the two walls are connected together laterally throughout
their length by diagonal sets or groups of tubes E, E... Es arranged to cross
each other as shown and located in the combustion chamber F above a fire grate G.
Where two groups of tubes meet together on the cylindrical portions of the water
valls, there is provided within each vessel and opposite the open ends of the nests
of tubes, a diaphragm or deflector H one of which is shown separately and to a
arger scale in Fig. 3, and which is arranged to form with the water vessel, a short
ptake passage. By means of these diaphragms H, the water and steam flowing

page_text: from the lower set of tubes to the next adjacent upper set of tubes is quite
separated from the water at the opposite sides of the diaphragms which can
therefore descend through the water walls to the bottom vessels A, C in order to
re-enter the series of heating tubes E.... E. Each diaphragm H thus forms a
junction box or case for connecting together the adjacent ends of two, or it may be
more, sets of tubes such as E and E, E and E' and so on. The diaphragm shown
in Fig. 3 is adapted to cover the adjacent ends of two sets of tubes and is so
constructed that it can be easily fixed in place or released by operating in the
proper direction a pair of handles H (Figs. 3 and 4) the short ends of which
are adapted to engage lugs H on the diaphragm. The diaphragms shown, are
in the form of shallow boxes that may be made of cast or forged steel or iron
or of malleable cast iron, but it will be obvious that the several diaphragms in
each vessel may be replaced by a single one extending from end to end of the
vessel.
The cylindrical vessels forming the water walls may be spaced at any suitable.
distances apart vertically and may be of any suitable diameter but large enough to
permit a man to enter them, the upperinost front one A, and it may be also C being
made larger than the others and of sufficient size to form a main steam drum or
drums. This vessel A, or vessels A and C, is or are provided with a suitable
baffle I against which the mixed jets of water and steam issuing from the upper
sets of tubes are projected and which serves to deflect the issuing water downward
whilst permitting the steam to pass. Suitable constructions of, baffles for this
purpose are well known.
Each vessel A... A, C... C is provided with removable end covers to permit
of ready access being gained to their interiors. At the front of the boiler, the
vessels A... A are formed with a number of holes J normally closed by covers J'
or other suitable closing devices, by removing which the interiors of the heating
tubes E...E can be readily examined and cleaned and through which opening
the said tubes can be withdrawn or replaced when required. The front and back
water walls are covered on their outer sides with material that is a bad conductor
of heat and the two sides of the combustion chamber are closed by suitable end
walls made for example of metal plate lined with refractory material as usual. One
or more fire doors K is or are provided at the front of the boiler and an uptake L
at the top of the boiler above the combustion chamber.
In some cases, the junction boxes B... B³ may be provided with horizontal
tubes or stays as indicated at M that are normally closed by plugs but which will
serve when desired for the insertion of a brush for cleaning the external surfaces
of the tubes, as well as for sight holes. The furnace or bottom portion of the
boiler is made of a suitable framework lined with refractory material as usual.
The feed water may be supplied simultaneously, either to the two steam
drums A, C, or to the two lower water vessels A', C.
With the construction described, when the boiler is in operation, flame and
products of combustion will rise upward from the fuel on the firegrate G and pass
between the sets of tubes E.. E, the products of combustion finally escaping by
the uptake L. If desired baffle plates of refractory material may be placed upon
the sets of tubes, so as to cause the flame and products of combustion to pass in a
zig-zag direction through the combustion chamber F.
By the heating of the tubes E.. E water is caused to pass from the lower
water vessels A, C into the said tubes through which and the junctions or
uptakes formed between the diaphragms H and the adjacent walls of the water
vessels, it passes in a zig-zag direction and becomes converted partly into steam,
the steam and water ultimately reaching the steam drums A, C wherein the steam
is separated from the water which flows down through each water wall to the
bottom vessel to again rise as before, thereby producing an effective circulation of
the water through all parts of the boiler.
In some cases, the two water walls may be connected by inclined sets of heating
tubes that do not cross each other as in Fig. 1. Thus the sets of heating tubes

page_text: marked E, E', E, E and E, in Fig. 1, and the steam drum C, may be omitted,
the two water walls being then connected only by the zig-zag arranged sets of
tubes E, E, E, and E.
3
1000
vements
ter Tube Boilers.
J, JIRO MIYABARA, I.J.N., of 1 Eliot Hill, Lewisham, in the County of London,
Naval Constructor, 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 :-
This invention has for its object to provide a simple, convenient and efficient
water tube boiler in which there shall be an effective circulation of water and
steam and which is so constructed as to permit of easy access for examining and
cleaning all the important parts of the boiler, both internally and externally, and for
removing and replacing any tube of the boiler whilst leaving the rest of the boiler
in a workable condition.
My improved boiler comprises two water walls arranged to form the front and
back of a combustion chamber and each composed of horizontal cylindrical vessels
arranged one above another and connected together by interposed flanged junction
boxes or by short vertical tubes and the upper of which serves as a steam drum,
the two walls thus constructed being connected by sets of diagonal or inclined
heating tubes that extend across the combustion chamber above the fire grate, there
heing provided within the water vessels, except the top and bottom ones, diaphragms
or deflectors that are arranged opposite the open ends of the inclined heating tubes
so as to direct the streams of water and steam arriving from the upper ends of
lower groups of tubes into the lower ends of the next upper groups of tubes and
thereby permit the remaining portions of the water walls to act as downtakes.
The boiler can be made either single or double ended and is suitable for marine
or land service.
In the accompanying drawings, Fig. 1 is a cross section, and Fig. 2 a front
elevation, with a part broken away, showing a single ended water tube boiler
constructed according to this invention and suitable for marine purposes. Figs. 3
and 4 are enlarged detail views.
A, A... A are horizontal cylindrical vessels arranged one above the other and
connected together by interposed flanged junction boxes B, B¹... B³ so as to form
a front water wall to the boiler. C, C... C are similar horizontal cylindrical
vessel's connected together by interposed flanged junction boxes D, D¹. . . D³
so as to form a rear water wall. The portion of the circumference of each
vessel A... A, C.... C opposite a junction box B... B³, D... D³, is formed
with slits or holes A*, C* respectively, so as to place the several vessels in each
vertical row in free communication with each other through the interposed junction
boxes. The vessels comprising the two walls are connected together laterally
throughout their length by diagonal sets or groups of tubes E, E'... E³ arranged
to cross each other as shown and located in the combustion chamber F above a
fire grate G. Where two groups of tubes meet together on the cylindrical portions

page_text: of the water walls, there is provided within each vessel and opposite the open ends
of the nests of tubes, a diaphragm or deflector H one of which is shown separately
and to a larger scale in Fig. 3, and which is arranged to form with the water
vessel, a short uptake passage. By means of these diaphragms H, the water and
steam flowing from a lower set of tubes to the next adjacent upper set of tubes ia
separated from the water at the opposite side of the corresponding diaphragm
which can therefore descend through the water walls to the bottom vessels A*, C
in order to re-enter the series of heating tubes E... E. Each diaphragm H
thus forms with the vessel in which it is placed a junction box or case for connecting
together the adjacent ends of two, or it may be more, sets of tubes such as E
and E, E and E and so on. The disphragm shown in Fig. 3 is adapted to corer
the adjacent ends of two sets of tubes and is so constructed that it can be easily
fixed in place or released by simple means such as by operating, in the proper
direction, a pair of handles H (Figs. 3 and 4) the short ends of which are adapted
to engage lugs H' on the diaphragm. The diaphragms shown, are in the form of
shallow boxes that may be made of cast or forged steel or iron or of malleable
cast iron, but it will be obvious that the several diaphragms in each vessel may be
replaced by a single one extending from end to end of the vessel.
The cylindrical vessels forming the water walls may be spaced at any suitable
distances apart vertically and may be of any suitable diameter but generally large
enough to permit a man to enter them, the uppermost front one A, and it may be
also the uppermost rear one C, being made larger than the others and of sufficient
size to form a main steam drum or drums. The vessel A, or vessels A and C, is or
are provided with a suitable baffle I against which the mixed jets of water and
steam issuing from the upper sets of tubes are projected and which serves to deflect
the issuing water downward whilst permitting the steam to pass. Suitable
constructions of baffles for this purpose are well known.
Each vessel A...A, C... C is provided with removable end covers to permit
of ready access being gained to their interiors. At the front of the boiler, the
vessels A... A are formed with a number of holes J normally closed by covers J¹
or other suitable closing devices, by removing which the interiors of the heating
tubes E... E can be readily examined and cleaned and through which opening
the said tubes can be withdrawn or replaced when required. The front and back
water walls are covered on their outer sides with material that is a bad conductor
of heat, and the two sides of the combustion chamber are closed by suitable end
walls made for example of metal plate lined with refractory material as usual.
One or more fire doors K is or are provided at the front of the boiler and an
uptake L at the top of the boiler above the combustion chamber.
In some cases, the junction boxes B... B³ may be provided with horizontal
tubes or stays, as indicated at M, that are normally closed by plugs but which
will serve when desired for the insertion of a brush for cleaning the external
surfaces of the tubes, as well as for sight holes. The furnace or bottom portion
of the boiler is made of a suitable framework lined with refractory material as
usual.
The feed water may be supplied simultaneously, either to the two steam drums A,C,
or to the two lower water vessels A*, C*.
With the construction described, when the boiler is in operation, flame and
products of combustion will rise upward from the fuel on the firegrate G and pass
between the sets of tubes E... Es, the products of combustion finally escaping by
the uptake L. If desired baffle plates of refractory material may be placed upon
the sets of tubes, so as to cause the flame and products of combustion to pass in a
zig-zag direction through the combustion chamber F.
By the heating of the tubes E... Es, water is caused to pass from the lower
water vessels A, C into the said tubes through which and the junctions or uptakes
formed between the diaphragms H and the adjacent walls of the water vessels, it
passes in a zig-zag direction and becomes converted partly into steam, the steam
and water ultimately reaching the steam drums A, C wherein the steam is separated

page_text: from the water which flows down through each water wall to the bottom vessel to
again rise as before, thereby producing an effective circulation of the water through.
all parts of the boiler.
In some cases, the two water walls may be connected by inclined sets of heating
tubes that do not cross each other as in Fig. 1. Thus the sets of heating
tubes marked E, E³, E, E, aud E8, in Fig. 1 and the steam drum C, may be
omitted, the two water walls being then connected only by the zig-zag arranged
sets of tubes E1, E2, E, and Eº.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A water tube boiler comprising water walls arranged to form the front and
back of a combustion chamber and each composed of horizontal cylindrical vessels
arranged one above another and connected together by interposed flanged junction
boxes or by tubes and the upper of which serves as a steam drum, diagonal or
zig-zag heating tubes located in the combustion chamber and connected to the
cylindrical vessels, and diaphragms or deflectors located within the said vessels
opposite the upper and lower ends of adjacent sets of tubes so as to form short
uptakes that connect the said tube ends and are separated from the remaining
portions of the vessels which, with the intermediate junction pieces or tubes, serve
as downtakes, substantially as herein described.
2. In a water tube boiler in which connected water vessels are arranged one
above another and have sets of inclined heating tubes connected to them as set
forth, the provision within the water vessels opposite the tube ends of diaphragms
or deflectors such as H adapted to form with the walls of the vessels short
uptakes that are separate from the remaining portions of the said vessels,
substantially as herein described for the purposes specified.
3. My improved water tube boiler constructed substantially as hereinbefore.
described with reference to and shown in the drawings annexed.
Dated this 8th day of December 1896.
JIRO MIYABARA.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant..