Year: 1898

page_text: We, THOMAS WILLIAM MAY and HENRY TADWELL DAVIS, Engineers, both of John
Penn & Sons, Limited, of Greenwich, in the County of Kent, do hereby declare
the nature of this invention to be as follows;-
This invention relates to means for circulating water in water tube boilers.
In boilers in which each tube is provided with an inner circulating tube the
upper ends of the latter pass through and are fixed to a trough shaped sub-
merged plate. At each side of the boiler is fixed a pair of inclined plates a
short distance apart, the inner plates extending above the water level. Tho
steam and water from the outer or fire heated tubes are deflected towards the
sides of the boiler by the underside of the trough and rise along the outer sides
of the outer plates. The steam passes round the ends of the plates into the
steam space whilst the water passing over the upper edges of the outer plates is
deflected downwards by the inner plates and descends the inner tubes.
The deflecting plates are by preference made with serrated edges in the usual
way or with serrated edges and the edges of the serrations bent over or other-
wise roughened so as to entrap the water and allow steam to pass.
In boilers in which there are no inner tubes but, separate down pipes leading
to chambers into which the lower ends of the tubes open, a similar construction
is employed the upper ends of the down pipes opening into the trough.
Dated this 11th day of January 1898.
THOMAS WILLIAM MAY.
HENRY TADWELL DAVIS.
improvements in
We, THOMAS WILLIAM MAY and HENRY TADWELL DAVIS, Engineers, both of John
Penn & Sons, Limited, of Greenwich, in the County of Kent, 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 state-
ment:-
This invention relates to means for circulating water in water tube boilers.
Figure 1 is a transverse section, and Figure 2 a longitudinal section, of a
boiler constructed according to this invention, in which each tube a is provided
with an inner circulating tube b, the upper ends of the latter pass through and
are fixed to a trough shaped submerged plate c. At each side of the boiler is
Di

page_text: fixed a pair of inclined plates and e a short distance apart, extending above
the water level. The steam and water from the outer or fire heated tubes a,
are deflected towards the sides of the boiler by the underside of the trough c,
and rise along the outer sides of the outer plates d. The steam passes round
the ends of the plates d into the steam space, whilst the water passing over the
upper edges of the outer plates d is deffected downwards by the inner plates e
and descends the inner tubes b.
The deflecting plates d and e, are by preference made with serrated edges
in the usual way, as shown in Figure 2, or with serrated edges and the edges
of the serrations bent over or otherwise roughened so as to entrap the water
and allow steam to pass.
Figure 3 is an elevation and transverse section, and Figure 4 a longitudinal
section, of a boiler in which there are no inner tubes but separate down pipes f
leading to chambers g into which the lower ends of the tubes a open.
This boiler is provided with plates d and e similar to those just described,
and a trough e which leads the water to the ends of the boiler, from whence it
descends by the pipes f into the chamber g.
Figure 5 is a vertical section, and Figure 6 a horizontal section
on the
line 6-6, Figure 5, of a boiler made with "Field" tubes entering the end of
the steam drum. The inner or circulating tubes b are of such a length as to
penetrate the trough C. This trough is made of dished form or as a portion of
a cone, with a central hole of such size that a copious flow of water is directed
to the tube 'plate. The deflecting plate d is also made of conical or dished form
in the manner shown.
Figure 7 is a vertical section, and Figure 8 a horizontal section, on the
line 88 Figure 7, of a boiler made with ordinary tubes a and a lower water
chainber g with which the tubes communicate. The lower plate d is of conical
or dished form with the convexity uppermost. A central hole is made in it as
shown and above this is a deflecting plate e of dished form placed as shown so
as 'to deflect in a downward direction water that is ejected through the central
opening.
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. The combination with a water tube boiler of means substantially as described
for separating the water from the steam and supplying the downward current
from a part of the boiler little affected by ebullition.
2. The combination of the parts c d and e substantially as described and illus-
trated in the drawings.
3. Water tube boilers substantially as described and illustrated in the drawings.
T
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