Improvements in Water Tube Boilers.
Year: 1897

page_text: Date of Application, 29th June, 1897-Accepted, 31st July, 1897
Improvements in Water Tube Boilers.
T, REGINALD HADDAN, of the firm of Herbert Haddan & Co., of 18, Buckingham
Street, Strand, London, W.C., Patent Agent, do hereby declare the nature of this
invention, a communication to me from abroad by Egbert Pomeroy Watson,
Mechanical Engineer, of 181 Madison Avenue, Elizabeth in the State of New York,
United States of America, and in what manner the same is to be performed, to he
particularly described and ascertained in and by the following statement.
This invention relates to a novel construction of a water tube boiler as pointed
out in the following specification and claim and illustrated in the accompanying
drawing in which-
Figure 1 shows a vertical central section in the plane v v Fig. 4.
Figure 2 is a horizontal section in the plane fig. 1 looking upward.
Figure 3 is a similar section in the plane y y Fig. I looking downward.
Figure 4 is a vertical central section in the plane w w Fig. 1.
Figure 5 is a horizontal section in the plane z Eig. 4.
In this drawing the letter A designates an annular water chamber which may be
made of sheet steel or any other suitable material and B is another annular chamber
for water and steam. These two chambers are connected by a diaphragm C best
made of sheet steel. In the example shown in the drawing this diaphragm is made
conical and connected to annular shoulders abformed on the chambers A and B
respectively, but said diaphragm may be made cylindrical and connected to the two
chambers in any other suitable manner.
On the outside of the diaphragm C are situated a series of pipes D which are
secured at their upper ends to and open into the water and steam chamber B and
at their lower ends they are secured to and open into the water chamber A so that
the water can freely circulate through these pipes.
Inside of the diaphragm C are situated a series of pipes F secured at their upper
ends to and opening into the water and steam chamber B while their lower ends are
Secured to and open into the water chamber A so that the water can freely circulate
through these pipes.
G is the fire grate which is situated in the annular space of the water chamber A
and above this fire grate is placed a baffle plate II which may be secured in position
by any suitable means such as a series of rods suspended from the bottom of the
steam and water chamber B and at any desired distance above the fire grate G.
I is the smoke stack the diameter of which corresponds to the central tubular
passage of the steam and water chamber B and which in the example illustrated
in the drawing is secured directly to the top of the chamber B:
The heated products of combustion which rise from the fire grate strike the baffle
late H and are caused to circulate between the pipes F and in order to facilitate
this circulation said pipes F may be arranged in groups of four (more or less) as
shown in Figs. 2 and 5. The water in the pipes F is thus heated and caused to rise
up while the pipes D are protected against the direct influence of the heated pro-
ducts of combustion by the diaphragm C so that the comparatively cool water in
these pipes will descend and a rapid natural circulation of the water will be effected!

page_text: The water will be fed into the boiler through a pipe J which may be connected
to the chamber A and the steam may be drawn off from the boiler through
pipe K extending from the top of the chamber.
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In order to get access to the fire grate G the diaphragm C is provided with a
der C and the pipes D, F F are shortened (see Fig. 4) the pipes Du being
nected at their lower ends to horizontal pipes 19 which communicate with the
pipe D D while the pipes F¹ F¹ are connected at their 'ower ends to Horizontal
pipes which communicate with the pipes F F (see Figs. 1 and 4).
Instead of placing the fire grate into the annular-space of the chamber A it may
in placed into a cylindrical jacket secured to the bottom of said annur chamber
as indicated in dotted lines in Fig. 4 and in that case no fire door need be provided
in the diaphragm C and the bottom ends of all the pipes D and F will be secured
in the top of the chamber A.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. In a water tube boiler, the combination of two annular chambers A B, an
outer series of pipes D communicating with said chambers near their outer circum-
ferences; an inner series of pipes F communicating with said chambers near their
central portions, an annular diaphragm C fastened to the annular chambers at some
distance from their outer circumferences to form a solid shield between the outer
series of pipes and situated at some distance from each series of pipes, a fire place
situated practically beneath the centre of the diaphragm C, and a smoke flue ex-
tending through the center of the annular steam and water chamber B, substantially
as described.
2. In a water tube boiler the combination of two annular chambers A B, a
practically unbroken diaphragm C fastened to the annular chambers at some
distance from their outer circumferences, a series of pipes D connecting the
chambers A B and situated on the outside of the diapliragin C, a series of pipes F
situated inside of said diaphragm and also connecting the chambers A B, a fire
grate G situated in the annular space of the chamber A, the baffle plate H and a
sinoke stack extending through the centre of the chamber B substantially as:
described.
3. In a water tube boiler the combination of the annular chambers A B, a
practically unbroken diaphragm C connected to the annular chambers at some
distance from their outer circumferences, a series of pipes D connecting the
chambers A B and situated on the outside of the diaphragm C, a series of pipes. F
situated inside of said diaphragm and also connecting the chambers A B, a
fire grate G situated in the aunular space of the chamber A, a fire
door C in the diaphragm C,,pipes D' D³, F' F'for giving access to the fire grate and
a smoke flue extending through the centre of the chamber B substantially as
described.
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