Year: 1898

page_text: We, WILLIAM WOOD TUCKER, Engineer, and WILLIAM THOMAS TUCKER,
Engineer, both of 38, York Street, Jarrow, in the County of Durham, do hereby
declare the nature of this invention to be as follows;
-
Our invention relates to steam generators of the marine multitubular type,
the object being to obtain increased efficiency.
To this end, we make the boiler of the usual shape and with any suitable
number of furnaces, each of which we unite to a combustion chamber made of
an area sufficient to give space for more than one group or nest of smoke tubes
for establishing communication with the smoke box, whereat we situate a grid-
iron valve or series of slides for alternately closing and opening each vertical
row of tubes. The movements of this valve are effected by connecting it to an
appropriate motor, and in operation, when one vertical row of tubes is closed
that on either side is open, hence the latter maintain the necessary draught
while the discharge of the contents of the closed tubes is momentarily impeded
thereby accomplishing the combustion of any unburnt gases with the resulting
benefit. The tube groups or nests are so spaced that a distinct water space
intervenes between each to permit free circulation. In the combustion chamber
we arrange horizontal and vertical, or approximately horizontal and vertical
tubes for connecting the water spaces at the back and front and the top and
bottom thereof respectively, thus providing for the circulation of the water at
the back and bottom of the boiler and in addition furnishing increased heating
surface. The horizontal tubes are fitted to open into the aforesaid space inter-
vening between the smoke tube nests and they are jointed to the back and front
The vertical tubes are
plates of the chamber so as to act as stays thereto.
joined to the crown and bottom of the chamber thereby serving as efficient
supports to the former part.
From the foregoing it will be seen that, by our invention, the energy of the
fuel is utilized to great advantage, efficient circulation is attained and the com-
bustion chamber is effectively stayed against collapse.
1
of Santambor 1898.
PRYOR & HARVEY,
Agents.

page_text: declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:
-
Our invention relates to steam generators of the marine multitubular type,
the object being to obtain increased efficiency.
We will fully describe our invention in reference to the accompanying draw-
ings illustrating its application to a boiler of the single-ended type. Of these
drawings, Fig. 1 is an end elevation at the smoke-box end, the box being
removed; Fig. 2 is, a longitudinal section through one combustion chamber
and furnace; and Fig. 3 is a transverse section on the line X-Y in the previous
figure looking in the direction of the arrow.
We make the boiler of the usual shape and with any suitable number of
furnaces A, A, each of which we unite to a combustion chamber B, made of an
area sufficient to give space for more than one group or nest of smoke tubes C, C
for establishing communcation with the smoke-box. The illustrations represent
a boiler with two furnaces and with two groups or 'nests c, c¹ of smoke tubes C, C
fitted to each combustion chamber B, but of course these numbers may be
increased to meet particular requirements or designs.
At the smoke-box and within it we situate a grid-iron valve D or series of
slides for alternately closing and opening each vertical row of the tubes C, C.
As shown in Figs. 1 and 2, this valve is composed of four sets of spaced metal
slides or strips d, d forming two series connected together by a rod, the
slides d, d of each series being fastened to a strip d² and other strips d³, d³,
which are supported by a frame constituted by bars d, d, d, driveted to the
tube plate, the bars, serving to guide the valve in its reciprocations. The
strips d, d are each made of a length and width sufficient to completely cover
a vertical row of the tubes C, C, while their distance apart is such as not to
obstruct the outlets of the uncovered rows. The valve D, as will be seen from
Figs. 1 and 2, does not bear upon the ends of the tubes C, C, but upon
strips do, do, one being located between every vertical row of tubes and fastened
at both ends to the bars d, d. We prefer this disposition as it permits the fitment
of all the usual kinds of tube stoppers, whereas, if the valve worked directly upon
the tube-ends, it would prevent those types having parts projecting outside the
tube ends being used.
1
The movements of the valve D are effected by connecting it to an appropriate
motor for which purpose, according to the example, we fix to its back, as shown
in Figs. 1 and 2 or otherwise conveniently, rods d', ds, the latter being guided
in a bracket on the boiler shell and the rod joined to a rocking lever do to
which motion is imparted by a rod 10 communicating with the motor; packing
being applied where necessary to ensure tightness at the smoke-box.
The operation of the valve D) is as follows:-
When a vertical row of the tubes C, C is closed by a strip or slide d, that on
either side is open, hence these uncovered rows maintain the necessary draught,
while the discharge of the contents of the closed tubes is momentarily impeded,
thereby accomplishing the combustion of any unburnt gases with the resulting
benefit.
The tube groups or nests c, el are so spaced that a distinct water space E,
Fig. 1, intervenes between them to permit free circulation.
The
In each combustion chamber B we arrange horizontal and vertical, or approxi-
mately horizontal and vertical, tubes b, b, 61, 61, Figs. 2 and 3, for connecting
the water spaces at the back and front and the top and bottom thereof
respectively, thus providing for the circulation of the water at the back and
bottom of the boiler and in addition furnishing increased heating surface.
horizontal tubes b, bare fitted to open into the aforesaid space E and they are
joined in any suitable manner to the back and front plates of the chamber B so
as to act as stays thereto. The vertical tubes b¹, I are joined to the crown
and bottom of the chamber thereby serving as efficient supports to the former

page_text: part, the joints being made by flanging the tubes and riveting up or otherwise.
The arrangement of these tubes 61, 6 at the bottom of the chamber B is shown
clearly in Figs. 2 and 3 and from them it will be seen that the end and bottom
plates are so connected that a free waterway is obtained.
From the foregoing it will be seen that, by our invention, the energy of the
fuel is utilized to great advantage, efficient circulation is attained and the
combustion chamber is effectively stayed against collapse.
The parts herein described are constructed of the usual material or materials
employed in boiler making.
Of course, our invention is also applicable to boilers of the double-ended type
as will be readily understood, without further description or illustration, from
the example given.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. In steam generators of the marine multitubular type, the combination with
the smoke tubes of a grid-iron valve or series of slides adapted to alternately
close and open each vertical row of tubes, substantially as and for the purpose
herein set forth.
2. In steam generators of the marine multitubular type, utilizing each furnace
to a combustion chamber and fitting thereto more than one group or nest of
smoke tubes and arranging in each combustion chamber horizontal and vertical
or approximately horizontal and vertical tubes, all substantially as and for the
purposes herein set forth.
3. A steam generator of the marine multitubular type comprising the
combination of groups or nests c, c² of smoke tubes for establishing com-
munication between a combustion chamber and the smoke box and having a
water space E between them; a valve, such as D, with operating means for
alternately closing and opening each vertical row of tubes; and tubes, such
as b, b, b, b, in each combustion chamber for connecting the water spaces at the
back and front and the top and bottom thereof respectively, all arranged or
adapted for use substantially as herein described in reference to the accompany-
ing drawings.
4. The combination and arrangement of parts constituting our improvements
in steam generators, all arranged and operating substantially as and for the
purposes herein described and illustrated in the accompanying drawings.
Dated this 7th love of Tu 1900
Dated this 7th day of June 1900.
For the Applicants,
J. A. HARVEY,
Chartered Patent Agent,
3, St. Nicholas' Buildings, Newcastle-on-Tyne.