Improvements in and relating to Water-tube Boilers.
Year: 1899

page_text: Date of Application, 14th Jan., 1899-Accepted, 11th Mar., 1899
of Norway, Mechanical Engineer.]
Improvements in and relating to Water-tube Boilers.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord Street,
Liverpool, and 6, Bank Street Manchester, both in the County of Lancaster, and
Lower Temple Street, Birmingham, in the County of Warwick, Civil Engineer,
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 water tube boilers and consists in certain improvements,
whereby a better circulation of the water is attained. These improvements partly
consist in arrangements of plates of special form in the rear tube box, whereby
the descending stream of water is brought down to the lowermost part of the said
box before it is allowed to enter the boiler tubes, and partly in arrangements of
plates in the top boiler (or steam reservoir), whereby the flow of hot water coming
from the front tube box is directed towards the rear of the top boiler and the steam
is allowed to rise and separate from the water. Hereby the usual priming of the
water in the steam reservoir is to a great extent avoided and more dry steam
obtained.
The said improvements will be more specially explained with reference to the
annexed drawings in which a preferred form of a boiler with these improvements
is shewn.
Figure 1 shews a longitudinal section through a water-tube steam boiler.
Figure 2 is a cross section on the lines 2-2 of Figure 1.
Figure 3 is a cross section on the lines 3-3 of Figure 1.
Figures 4 and 5 illustrates a modification of the construction of the top boiler;
Figure 4 is a longitudinal section and Figure 5 a cross section on the line 5—5,
Figure 4.
A is the bundle of tubes forming the boiler proper. B is the top boiler or
steam reservoir and the front and V the rear box connecting the boiler tubes A
with the top boiler. In the front box the heated water mingled with steam is
passing upwards, and in the rear box V the comparatively cold water is passing
downwards. In usual boilers of this type this circulation will take place in such
a way that most of the water passing down in V will flow into and through the
topmost of the boiler tubes, this being the shortest way. As this, however, is not
advantageous on account of the lowermost tubes being exposed to the hottest part
of the fire, I arrange plates R within the box V, which plates are bent so as
to deflect the flow of water sideways, so that it must pass down to the bottom of
the box before entering the greater part of the tubes, as shewn by arrows. This
downflow will of course ass some tubes, but these are very few and it is clearly
sten, that in this manner the object of feeding the water down to the lowermost
tubes is attained in a very simple manner.

page_text: The arrangements used for directing the flow of water and steam in the top
boiler are shewn in two modifications. I will now first describe the modification
shewn in Figure 1 and 3.
The top boiler B is provided at its fore end with a mantle or annular chamber D,
to which the front box is connected. This annular space corresponds with spaces
formed between the boiler shell and plates P placed inside the same on each
side, through openings C in the boiler shell. The water will therefore pass in
the direction of the arrows, as shewn especially in Figure 3. In the plates P
are cut holes E, to allow some of the steam to escape through them into the steam
space of the boiler.
In the modification shewn in Figures 4 and 5 there is no annular space ])
arranged around the boiler end. The water from the box U here enters a chamber
formed between the plates P, the boiler plates and a plate T placed between the
plates Pacross the boiler. From this space or chamber the water flows through
openings into the space F" formed between the plates P' and the boiler shell.
The flow of the water will be seen from the arrows.
By the arrangements described a very lively circulation of water is created, and
at the same time means are provided whereby the steam is allowed to escape from
'the water in the top boiler, so that dry steam is obtained, because in the space
between the plates P and P¹, there is no rush of water, so that the water will
here have a quiet surface.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is:-
1. In watertube boilers the arrangement of plates such as R in the rear tube
box, C, forming deflectors to direct the flow of water down to the lowermost tubes
for the purpose of securing a uniform flow of water through the whole set of
tubes.
2. In watertube boilers the arrangement of plates, such as P P¹, in the top
boiler or steam reservoir, said plates forming between them an inner space and
two outer spaces, which latter correspond with the front tube box and take up
the water and steam coming from the same substantially as described with
reference to Figures 1, 3, 4 and of the accompanying drawings.
Dated the 14th day of January 1800
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.