An Improved Mode of Developing and Increasing the Draught of Furnaces.
Year: 1885

page_text: An Improved Mode of Developing and Increasing the Draught
of Furnaces.
I WILLIAM ARENA MARTIN of 9 & 11 Pocock Street, Blackfriars Road,
Southwark in the County of Surrey Engineer, do hereby declare the nature of
my Invention for AN IMPROVED MODE OF DEVELOPING AND INCREASING THE
DRAUGHT OF FURNACES, to be as follows:—
The object of this invention is to develope and increase the draught of furnaces
especially those of marine boilers. For this purpose I employ a rotary fan or fans,
which I fix at the side of the funnel or chimney, to exhaust and eject the products
of combustion evolved by and arising from the furnace or furnaces.
The inlet or inlets of the said rotary fan or fans is or are connected with an
aperture or apertures in the said funnel or chimney so that only the gases or
products of combustion and none of the outer air can pass into or through the said
rotary fan or fans. The outlet or outlets of the said rotary fan or fans opens or
open into and is or are connected with another aperture or apertures in the said
funnel or chimney. Between the said inlet or inlets and the said outlet or outlets
I fix a "shut off valve" in the said funnel or chimney, so as to separate the
exhaust from the discharge and to ensure that all the products of combustion
entering the funnel or chimney shall pass through the said rotary fan or fans,
whilst the same is or are in operation, but if for any reason it becomes necessary to
stop the working of the said rotary fan or fans, the said "shut off valve" may be
opened and the products of combustion allowed to pass straight up the funnel or
chimney in the ordinary way.
I propose to fix the bearing or bearings for the driving shaft of the said rotary
fan or fans outside the casing of the same and apart from the funnel or chimney so
as to be free from the effects of the heat arising from the furnace or furnaces.
In the case of two rotary fans being used I propose to work them by the same
driving shaft passing through the centre of the funnel or chimney and connecting
them.
PLL

page_text: COMPLETE SPECIFICATION.
An Improved Mode of Developing and Increasing the Draught
of Furnaces.
I WILLIAM ARENA MARTIN of 9 and 11 Pocock Street, Blackfriars Road,
Southwark in the county of Surrey Engineer do hereby declare the nature of
my Invention for AN IMPROVED MODE OF DEVELOPING AND INCREASING THE
DRAUGHT OF FURNACES, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :—
The object of this invention is to develope and increase the draught of furnaces
especially those of marine boilers. For this purpose I employ a rotary fan or fans
which I fix at the side or sides of the funnel or chimney to exhaust and eject the
products of combustion evolved by and arising from the furnace or furnaces.
The inlet or inlets of the said rotary fan or fans is or are connected with and
open into an aperture or apertures which I make at the side or sides of the said
funnel or chimney, so that only the gases or products of combustion arising from
the furnace or furnaces and none of the outer air can pass into or through the said
rotary fan or fans.
The outlet or outlets of the said rotary fan or fans is or are connected with and
open into another aperture or other apertures which I make in the said funnel or
chimney just above the periphery or peripheries of. the said rotary fan or fans
Between the said inlet or inlets and the said outlet or outlets I fix a "shut off
valve" in the said funnel or chimney which when closed separates the exhaust
from the discharge and ensures that all the products of combustion entering the
funnel or chimney shall pass through and be subject to the action of the said rotary
fan or fans whilst the same is or are in operation, but if for any reason it becomes
necessary to stop the working of the said rotary fan or fans, the said "shut off
valve" may be opened and the products of combustion allowed to pass straight up
the funnel or chimney in the ordinary way.
I propose to fix the bearing or bearings for the driving shaft of the said rotary
fan or fans outside the casing of the same and apart from the funnel or chimney
so as to be as much as possible free from the effects of the heat arising from the
said furnace or furnaces.
And with a view of further preventing the access of heat to the said bearing or
bearings I propose in some cases to make a division or divisions in the said driving
shaft at a point or points between the said rotary fan or fans and the said bearing
or bearings and to connect the parts of the said driving shaft, so divided, by a
hollow non-conducting coupling inserted between the said parts.
In the event of two rotary fans being used I propose to work them by the same
driving shaft passing through the centre of the funnel or chimney and connecting
them.
And that part of the said driving shaft which passes through the aforementioned
funnel or chimney may be shielded from the heat arising from the furnace or
furnaces by a tube or pipe encasing it.

page_text: In order that my Invention may be fully understood I shall now proceed more
particularly to describe the same and for that purpose shall refer to the drawings
accompanying this specification.
Figure 1. is a section of a funnel or chimney having two rotary fans applied
thereto as herein described.
Figure 2, is an elevation of the said funnel or chimney showing one of the said
rotary fans (with the outer casing removed) applied or fixed thereto.
a. a. Figure 1. are the inlets of the said rotary fans opening into and connected
with apertures in the funnel or chimney through which the said rotary fans
exhaust or draw the products of combustion.
b. b. Figure 1. are the outlets of the said rotary fans connected with and opening
into other apertures in the funnel or chimney.
One of the said outlets is also shown on the elevation Figure 2 and marked b. b.
c Figure 1. is the "shut off valve" herein referred to for separating the exhaust
from the discharge. This may also be made to open upward from the side or to
slide in and out through a slot-hole in the said funnel or chimney.
d. Figure 1. shows the driving shaft passing through the centre of the funnel or
chimney and connecting the two said rotary fans.
e. is the pipe or tube herein referred to encasing that part of the said driving
shaft which passes through the funnel or chimney to shield the said driving shaft
from the heat arising from the furnace or furnaces.
f1 is a section of the said non-conducting coupling inserted between the divided
parts of the said driving shaft and f³ is an elevation of the same.
Although the said rotary fan or fans and the said funnel or chimney are herein
described and shown in the drawings in a vertical position, it may be necessary to
use the same horizontally as for instance for torpedo boats in which it is usual to
suppress the funnel.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
1st The application of rotary fans to funnels or chimneys and the use thereof in
the manner herein described and in the accompanying drawings illustrated.
2nd The construction use and application of funnels or chimneys having apertures
connected with the inlets and outlets of the said rotary fans and having the " shut
off valve" herein mentioned between the said apertures.
3rd The construction use and application of the hollow non-conducting coupling
as herein described and in the appended drawings illustrated.
In conclusion, I wish it to be understood that I am perfectly aware that rotary
fans have already been used in various ways for accelerating the draught of
furnaces and I do not claim any particular form or construction of fan, but simply
the application and use of the same as aforesaid.
Dated this 17th dose of Condomhan 100k