An Improvement in Water Tube Boilers.
Year: 1895

page_text: Date of Application, 13th Aug., 1895-Accepted, 14th Sept., 1895
[Communicated from abroad by JAMES MCGREGOR, and JOHN LEONARD
JACKSON, both of Saginaw, in the County of Saginaw and State of Michigan,
United States of America, Boiler Manufacturers.]
An Improvement in Water Tube Boilers.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, 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 relates to the construction of a cheap, strong and efficient water-
tube boiler, in which curved tubes are avoided, and the hot gases are compelled
to travel over all parts of the tubes, as I shall describe referring to the accom-
panying drawings.
Fig. 1 is a side elevation of an improved boiler according to this invention, one
side wall being removed to shew the interior.
Fig. 2 is an end elevation with the end wall removed. 2, 2, are longitudinal
girders in the side walls of the setting, which carry the boiler, ears 3 secured to the
heads or end chambers of the boiler resting on these girders.
The cylindrical heads 4 have outer convex sides and inner flat sides, the upper
part or half of each being inclined to the lower part or half, as shewn. Water
tubes 5 connect the lower portions of the heads to each other, these tubes being
slightly inclined down to the rear head.
Between and above the heads 4 a transverse steam and water drum 6 is carried
on supports 12, this drum being preferably, but not necessarily, of sufficient length
to extend through the side walls of the setting. The drum 6 has flat sides parallel
to the inclined upper parts of the inner sides of the heads 4 to which it is connected
by two sets of water tubes 7 and 8 at right angles to the inclined faces of the
drum 6 and of the heads 4.
By a baffle-wall 9. upon the upper row of tubes 5, and two vertical partitions 10,
resting upon the wall 9, the hot gases are compelled to pass horizontally among
the lower tubes, then several times across the upper tubes before reaching the up-
take 11. A steam-drum 13 is preferably connected to the upper face of the
drum 6 to serve as a receptacle for dry steam. There are coverings 14 of tile or
other suitable refractory material over upper inclined water-tubes extending from
the heads 4 to a steam and water drum 6. Cleaning doors 15 pass through the side
walls into the space above the baffle-wall 9, and 16 is a door in the rear wall of the
setting for access to the back end of the boiler which has a manhole 17 giving
access for cleaning and repairing tubes. 18 are manholes in the front head.
By the construction described, entirely avoiding hent tubes a strong and cheap
boiler is obtained, so arranged as to give strong circulation to the water, and a
thorough utilisation of the heat of the gases.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I
claim is :-
--
1. A water tube boiler comprising two chambers or heads and having inner sides
with their lower parts connected to each other by water tubes, and their upper
parts inclined and connected by water tubes to an upper drum, having corre-
pondingly inclined sides substantially as described.

page_text: 2. In a water tube boiler such as is above referred to, a horizontal baffle-wall
and partitions above the lower water tubes, so arranged as to compel the hot gases
to pass along these tubes and several times across the upper tubes, substantially as
described.
312th dox of August. 1895.
ABEL & IMRAY,
Agents for the Applicant.