IMPROVEMENTS IN THE APPLICATION OF AN EXHAUST CURRENT OF AIR OBTAINED FROM A FAN &C. FOR THE BETTER CONSUMPTION OF FUEL, AND ECONOMY OF HEAT IN FIREGRATES &C.
Year: 1886

page_text: I, REGINALD WALTER HEWETT, 65 Albion Street Birmingham, in the County
of Warwick, Manufacturing Jeweller, do hereby declare the nature of my inven-
tion for IMPROVEMENTS IN THE APPLICATION OF AN EXHAUST CURRENT OF AIR
OBTAINED FROM A FAN &C. FOR THE BETTER CONSUMPTION OF FUEL, AND ECONOMY
OF HEAT IN FIREGRATES &C. to be as follows:-
My invention relates principally to the manner in which I arrange the machine
or appliance for producing the exhaust or egressing current of air such as a bellows,
fan, blower or exhauster, when working by means of power supplied from a pulley,
engine or any ordinary mechanical contrivance, whereby I cause the same to act
upon the air issuing from the furnace, instead of that entering into it as is usually
or more cominonly done. That is to say I cause the current of air to be drawn
through the flames or heated fuel by the mechanical appliance rather than to urge
it or as it were to force it through.-I also cause the mechanically created current
to pass and if desired to repass through the boiler after it has been drawn through
the flames or heated fuel, and in this manner the heat of the material upon the fire
bars, or plate or grate or any other fuel receptacle, is made to be more usefully
employed and more value from the fuel is thereby obtained.
It must be understood that I allow the opening or ash-pit at the furnace mouth
to be the chamber, space or reservoir from which the air is drawn, or I employ any
convenient or ordinary opening to be the source of supply-In addition to these
methods I sometimes arrange one central chamber from which the air shall issue to
the furnace, or if more than one furnace is employed to the other furnaces.-I also
prefer to supplement the issuing air from this ordinary source by again allowing
the air drawn through the furnace to enter the furnace, grate or boiler; and by
this arrangement a warm supply of air is given to the fuel.
I will now describe my invention when applied to an ordinary steam Cornish
or Lancashire boiler.-The boiler is arranged in the usual or ordinary manner, the
fuel being placed upon the fire bars at the front end of boiler and the smoke and

page_text: heat travel along the flue or tube that runs from end to end of the boiler shell;
at the back or opposite end of this tube I connect another tube and cause this to
pass either through the boiler itself, or the tube is turned into a flue, by means of
a bent pipe or pipes, and then a fire-brick passage or passages is arranged against
the side or sides of the boiler in such a manner that the heated current shall be in
contact with the outside of the boiler shell.
At the end of this passage or passages I arrange a pipe or pipes to lead into a
mechanical exhauster, such as a fan, bellows, blower or other ordinary mechanical
appliance for withdrawing the air; and by this means cause the air to be rapidly
drawn through the furnace and the draught created as before described. The air
escapes from the mechanical exhauster into the chimney; but part of same I can
turn at will into the furnace grate or mouth for the purpose of supplying hot air as
herein before described.
I also employ a chamber for acting as the common exhaust chamber, when I have
a number of furnaces stoves or boilers working from one mechanical exhauster.
The application of my invention to other stoves, furnaces, fire grates &c. does
not differ in any essential respect, or material respect from the application herein-
described, to steam or other boilers.

page_text: I, REGINALD WALTER HEWETT of 65 Albion Street Birmingham in the County
of Warwick Manufacturer do hereby declare the nature of my invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
My invention relates principally to the manner in which I arrange an appliance
by means of exhausters Blowers, Bellows or Fans working by means of motive
power or any mechanical contrivance creating sufficient vacuum in flues or pipes to
cause air or gasses to pass through the fuel and producing a more intense and
effective combustion, that is to say currents of air in gasses to be drawn through
the fuel and continuing the same through flues or pipes by the mechanical appliance
which is distinct from the ordinary means of forcing blowing or causing draughts
or currents by means of flues, chimneys or steam jets.
It will be understood if I explain that an exhauster Blower, Bellows or fan is
attached in such a manner at the end or at any parts of a pipe or pipes, flue or flues
so as to create a sufficient vacuum in the same to draw air or gasses through the
pipes flues and fuel with which the reverse end or fire place is charged and thereby
causing combustion,
I may now explain my invention with the aid of the accompanying drawings as
applied to an ordinary Lancashire or Cornish boiler upon which
Figure 1 represents a sectional plan.
Figure 2 a side sectional view of the tanks and
Figure 3 a front view-with the front plate removed-of an ordinary Lancashire
boiler, with my appliance attached thereto. A, A is the outer shell and B, B the flues
which are fired at C, C. I attach tubes D, D to the flues at ď traversing within
the water space and taking the same through the side of the boiler at d² thence
into tank E through tank F terminating in chamber G at d³, which is air tight as
shown more clearly in Figure 2 and containing water to catch the dust. I then
propose to connect exhauster H to tank G by means of the pipe or tubes J tanks E
and F are kept filled with sufficient water to cover pipes D. The action would be
as follows. The exhauster being put into motion by means of any motive power
or mechanical contrivance the air is drawn through the fire at C. C from thence
into tubes D. D becoming partially cooled in tanks E the water contained in which
may be used as feed water for the boiler and further cooled in tank F and depositing
any dust they may contain in chamber G it then travels through pipe J into
exhauster H and delivered into any suitable space.
I would have it understood that the application of my invention to steam boilers
other than the ordinary Lancashire or Cornish arrangements also to boilers for

page_text: purposes other than for generating steam also to melting and heating furnaces, fire
grates stoves hot water and steam pipe systems of heating, hot air pipes or flues,
differs in no essential respect from the application herein before described as applied
to Lancashire or Cornish boilers and can be used in conjunction with my invention
intitled "Improvements in Boilers No. 7778 10th June 1886.
Having now particularly described the nature of my said invention and in
what manner the same is to be performed what I claim is :-
First The application of a mechanically created air exhaust blast by means of
an exhauster, blower, bellows or fans working by means of any motive power or
any mechanically contrivance as and for the purpose herein before set forth.
Second-The application of a mechanically created air exhaust blast by means of
an exhauster, blower, bellows or fans working by means of any motive power or
any mechanically contrivance to fire grates, stoves, boilers melting and heating
furnaces, hot water and steam pipe system of heating, hot air pipes and flues
substantially as hereinbefore set forth.