IMPROVEMENTS IN TUBULAR STEAM BOILERS
Year: 1884

page_text: I, BENJAMIN JOSEPH BARNARD MILLS of the firm of Harris and Mills of
23 Southampton Buildings in the County of Middlesex, Patent Agent do hereby
declare the nature of the said Invention for IMPROVEMENTS IN TUBULAR STEAM
BOILERS A communication to me from abroad by Carl. T. Burchardt of Berlin
in the Kingdom of Prussia and Empire of Germany, Patent Agent and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :—
The invention relates to tubular steam boilers in which the tubes communicate
with a front and an end chamber, water and steam filling the tubes and the
chambers.
And the invention consists in a peculiar construction of these two chambers.
In the accompanying drawings in which similar letters of reference denote
corresponding parts.
Figure 1 is a vertical longitudinal section of such boiler. Figure 2 is a vertical
cross section through the front chamber. Figure 3. is a similar section through
the end chamber. Figures 4, 5, 6 aro vertical sections through end chambers
constructed differently from that shown in Figure 3.
The front chamber A forms a hollow vessel without any partition walls, into the
back plate of which the water tubes h are screwed or fastened in any convenient
manner.
For the cleaning of the outside of the tubes h a number of pipes or hollow studs a
running from the back plate to the front plate of the chamber A are provided, as
also in the front plate, hand or cleaning openings f in connection with each tube h
which are closed by any of the devices such as g well known and used for this
purpose.
I achieve by this construction of the front chamber A the object of offering to
the vertical series of tubes h as well as to the horizontal tubes a continuous
chamber for the purpose of securing to the water at the slightest difference of
pressure an unobstructed flow to each tube h from the bulk of the water contained
in this chamber A. By these means any burning of the tubes h for want of water
is avoided.
It may be here remarked that the chamber or vessel A is made in ono casting
and shaped in such manner as if it consisted of a number of hollow globes, cones
or polygons arranged continuously together. The above mentioned pipes a are
plied at those points, best suited to stiffen and support the front and back plates
of the chamber A.
At the lowest portion of the latter and below the lowest row of tubes h a mud
chanel C is provided.
The back chamber B is constructed in a similar way and shows the same outside
appearance, but the interior of it is not uninterrupted in every direction, but is

page_text: divided by partition walls b into a series of vertical channels B' into each of which
open the tubes h of a vertical series and which communicate with each other only
at the top of the chamber B, forming there a horizontal channel D which containing
only steam is connected to the main steam pipe of the engine.
The boiler is set in such an inclined position, that the tubes h at their front ends
are lower than at their back ends, namely at an angle of 10 to 20 degrees.
Therefore not only the channel D is filled with steam but also the upper part of
each channel B'.
To facilitate the construction of these boilers, both chambers A and B
Figures 4, 5, 6 can be composed of a number of separate castings, forming
horizontal and vertical chambers A¹, B', or of still smaller hollow chambers or
heads, one for each tube h. The separate partial chambers and heads are connected
together steam tight. Those A¹ of the front chamber A, Figure 5 communicate
with each other as well in horizontal as in vertical direction and form also the mud
channel C; those B' of the back chamber B, Figures 4 and 6 only in vertical
direction with the exception of the top row in which they communicate also
horizontally for the purpose of forming the channel D¹. All the partial chambers
and heads A, B¹, are united and held together by bolts. In case the chambers A
or B are composed of partial chambers containing a number of heads in one casting,
bolts cc are used, which run in a direction vertical to the partial chambers
(Figure 5) but if single heads B' (Figure 6) are used they must be united by
a screw frame de which will exert a pressure on the heads B¹ in a vertical as well
as in a horizontal direction. In Figure 6 the single heads forming the steam
channel D' are bolted to the heads B' by means of the anchor bolts c.
It must be here remarked that the invention does not relate to the details of the
construction of the boiler. The joints of the heads B' or of the partial cham-
bers A B between each other; the application of the tubes h to the chambers A, B
or A¹ B¹ or heads B'; the steam drun; the fixtures; the furnace and other parts
may be made and carried out in different well known ways.
The boiler itself may be used as an independent one or in combination with
a boiler of other construction.
Having particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what
I claim is:
First: A tubular steam boiler as shown in Figures 1. 2. 3 of which the front
chamber A forms an uninterrupted space or chamber for the water and which is
in unimpeded communication with cach and all of the tubes whilst the back
chamber B is divided by partition walls b into a number of vertical channels B₁
into which open the tubes and which channels B' communicate at the top of the
chamber B by the steam channel D, substantially as explained and for the purpose
set forth.
Second: The construction of each of the chambers A and B of such boiler either
in one casting. (Figures 1, 2, 3) or of smaller separate chambers A¹ B¹ or of single
heads, one for each tube h which are suitably connected and held together by
bolts c, d, e, c', Figures 4, 5, 6 substantially as described and explained by the
drawings.
1004
B. J. B. MILLS.
By Harris & Mills,
23, Southampton Buildings,
Agents.