Improvements in Fire Tube Boilers.
Year: 1893

page_text: Date of Application, 2nd Oct., 1893
Complete Specification Left, 30th June, 1894-Accepted, 18th Aug., 1894
PROVISIONAL SPECIFICATION.
Improvements in Fire Tube Boilers.
I, GEORGE FRANCIS GABRIEL DES VIGNES, of 4 Montpellier Terrace,
Teddington, in the County of Middlesex, Mechanical Engineer, do hereby declare
the nature of this invention to be as follows:-
My invention refers to improvements in fire tube boilers, whereby, while effecting
an economy of floor space and simplicity of construction, I am enabled to greatly
subdivide the products of combustion by passing same through a large number of
tubes of comparatively small diameter, all as hereafter described.
According to my invention I form the body of the boiler of saddle or arch shaped
section, provided with ends flanged or otherwise for fixing; the body is thus
composed of an upper or top curved part with inclined side parts, extending down-
wardly, and in each of such sides I provide a set of tubes passing at right angles
therethrough. The furnace is located beneath the saddle shaped boiler, suitable
ends lined with refractory material or an annular water space being provided.
The body is suitably stayed both lengthways and crossways where necessary, and
the end plates are stiffened at the parts thereof opposite to the sets of tubes by
outside stiffening pieces affixed to the said end plates, or in any other convenient
manner as circumstances may require. The top or outer side of the body is
surrounded or surmounted by a casing at a suitable distance therefrom, and
terminating in an uptake. For small boilers one side only may be tubular and the
other an ordinary water space.
By this construction the area of furnace bars is large compared with the space
occupied by the boiler proper, extending as it does from side to side beneath the
downwardly spreading wing of the body, and continuing from end to end thereof,
while the entire products of combustion pass through the sets or groups of tubes to
the right and left, and out at the uptake. The produced steam may be taken off
from the upper part or dome of the saddle, either from the end or from the top
thereof, as most convenient and according to circumstances.
Dated this 2nd day of October 1893.
BREWER & SON,
London and Leeds, Agents for Applicant.
COMPLETE SPECIFICATION.
Improvements in Fire Tube Boilers.
I, GEORGE FRANCIS GABRIEL DES VIGNES of 4 Montpellier Terrace,
Teddington, in the County of Middlesex, Mechanical 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 refers to improvements in fire tube boilers, whereby, while effecting
an economy of floor space and simplicity of construction, I am enabled to greatly
subdivide the products of combustion by passing same through a large number of
tubes of comparatively small diameter, all as hereafter described.
The accompanying drawing shows an example of a fire tube boiler constructed
according to my invention, Fig. 1 being a half vertical transverse section and half
end view of same, Fig. 2 a half central longitudinal section and a half longitudinal
side elevation, and Fig. 3 is a section through one side of the boiler, taken on the
071

page_text: inclined plane indicated by the line X Y of Fig. 1 but drawn to a larger scale than
the latter figure.
Similar letters of reference indicate like parts in the several figures.
According to my invention I form the body A of the boiler of saddle or arch-
shaped section, as clearly shown at Fig. 1, provided with ends B B flanged as at
Fig. 3 or otherwise for fixing; the body A is thus composed of an upper or top
curved part with inclined side parts, extending downwardly, and in each of such
sides of the body AI provide a set of tubes C C passing at right angles therethrough,
one set being clearly shown in the vertical transverse section at Fig. 1. The
furnace D is located beneath the saddle shaped boiler A, suitable ends E, lined
with refractory material F, or an annular water space, being provided. The body
is suitably stayed (say by stays G) both lengthways and crossways where necessary,
and the end plates B B are stiffened at the parts thereof opposite to the sets of
tubes CC by outside stiffening pieces H affixed to the said ond plates B B, or in
any other convenient manner as circumstances may require. The top or outer side
of the body A is surrounded or surmounted by a casing J at a suitable distance
therefrom, and terminating in an uptake K. For small boilers, one side only may
be fitted with tubes..
By this construction, the area of furnace bars D' is large compared with the
space occupied by the boiler proper A, extending as it does from side to side
beneath the downwardly spreading wings of the said body A and continuing from
end to ends thereof, while the entire products of combustion pass through the sets
or groups of tubes CC to the right and left, and out at the uptake K. The
produced steam may be taken off from the upper part or dome of the saddle A,
either from the end or from the top thereof, as most convenient and according to
circumstances.
Having now 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 :
1. In fire tube boilers, a saddle shaped body, having a group or groups of fire
tubes, passing at right angles through one or both of the downwardly extending
sides of the said saddle shaped body, a furnace located beneath the saddle arch, and
a casing J with uptake K above the body substantially as set forth.
2. The general construction, arrangement and combination of parts composing
my improvements in fire tube boilers, all substantially as and for the purposes
herein described with reference to the accompanying drawings.
Dated this 30th day of June 1894.