Improvements in Draught Regulators for Furnaces and the like.
Year: 1894

page_text: Date of Application, 28th Mar., 1894
Complete Specification Left, 27th Dec., 1894-Accepted, 9th Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in Draught Regulators for Furnaces and the like.
I, CARL WILHELM STAUSS of 23 Spener Strasse, Berlin, in the Empire of
Germany, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
My invention consists principally in regulating the movement of the main
damper, which controls the quantity of the fire gases on the passage to the smoke-
stack.
This is accomplished by a gearing of grooved pulleys and chains, ropes or rods,
one end of which being fastened to the damper and the other to a bell moving up
and down in a dashpot, closed by a cap, and filled to a certain extent with a
liquid, thus admitting of a simultaneous corresponding motion.
The apparatus is operated as follows:-When putting fresh fuel on the grate,
the damper is raised to its highest position, the bell dipping correspondingly into
the liquid contained in the dashpot.
The closed top of the bell contains two valves one to be operated by hand or at
will and the other automatically by a rod or flat bar carried through the cap of the
dashpot with a screw twist in its lower section, which towards the end of the
operation opens more widely this second valve, thus admitting air more rapidly
into the bell, causing a more rapid raising of the same and correspondingly a
quicker shutting down of the damper, to a position where it is to remain until the
whole operation is repeated.
Dated this 28th day of March 1894
S. S. BROMHEAD,
97, Newgate Street, E.C., Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Draught Regulators for Furnaces and the like.
I, CARL WILHELM STAUSS of 23 Spener Strasse Berlin, Germany, Manufacturer
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 :--
The apparatus represented by Figs. 1 to 7 has for object the closing automatically
of the dampers of large furnaces with the view of gradually reducing the area
for the passage of the gases in correspondence with the burning down of the
fuel, until a minimum area is reached in order that the heat produced may be
throttled and thus be made more effective, instead of being driven at a high
temperature to the smokestack by the cold air entering the furnace.
I will now describe the invention with reference to the accompanying drawings
in which
Fig. 1 shows an elevation of the apparatus in action with the dash-pot, furnace
and damper in section.
Fig. 2 shows an enlarged elevation of the working parts connected to the dash-pot
partly in section.

page_text: Fig. 4 shows a plan of the slanting cut-out c' and adjacent parts.
Fig. 5 shows an enlarged sectional elevation of the mechanism contained in the
drum c, and cylinder e*.
Fig. 6 shows a side elevation of the cylinder e, forming the upper part of
Fig. 5.
Fig. 7 is a plan view of the valve cover d, shown in Fig. 5.
The apparatus works in such a way that at the beginning of the operation, after
fresh fuel has been put on the grate the damper moves slowly, but with the
advancing combustion gradually quicker, until it reaches the minimum point, where
it remains until the operation is repeated. The apparatus consists of a cylindrical
pipe closed at its lower end a, by a dashpot, which is filled with glycerine to a
depth equal to the height of the bell b, dipping into this liquid. In the top
of this bell b, a valve seat c, is arranged with an eccentrical slanting cut-out c¹,
Figs. 4 and 5.
The valve seat c, is covered by valve cover d, Fig. 5 provided with a hole d',
Figs. 5 and 7 in such a position that when this hole is placed at 1 Fig. 4 a
communication is obtained between the inside and the outside of the bell, equal to
the entire area of this hole d'. The move valve d, and with it the hole d' is turned
in the direction of position 2, they gradually reduce the area of d' until at 2, it is
entirely closed, and with it all communication between the space above the bell top
and below is shut off. To the valve cover d, Fig. 5 a short rod e', is attached fitted
in bush e', and held in position by pin e², which passes through it and through
slots e, in the said bush e, which latter is secured to the top of the bell. By this
arrangement the valve cover d, may be lifted from the valve seat c.
The continuation of bush e. Figs. 2 & 5 is formed by a flat rod e, twisted like a
screw, up to a pitch of 90 degrees. This rod e is guided through an opening in the
capf, of the pipe a, Fig. 2 of a rectangular cross section, as shewn in Fig. 3. This
cap f, surrounds a collar cast to the cover g, of the pipe a, against which it may be
Whenever
set by means of a set screw in any position as shewn in Figs. 2 and 3.
rode, with its screw like twisted part moves through the aperture of cap, then
this twist will act upon the valve cover by turning it right or left and with it close
or open hole '.
The upper round end of rod e, is fitted in a circular opening of the crosshead,
fastened to guide rods i, and by which it is also kept in its vertical position as in
Figs. 1, 2 & 3. In order that the bell may not turn when moving up and down but
rather maintain its position to its fixed position in cover g, it is held by guide rods i
which pass through this cover g, as in Fig. 3. These guide rods coupled by
crosshead, are connected by means of chains led over grooved pulleys and
connecting rods with damper . Damper is supported by a counterweight of
twenty-five to thirty kilos.
The weight of the liquid in pipe ", correspon is with the overweight of the
damper. Whenever fresh fuel has been put on the fire, damper is raised
beyond its ordinary position by hand by means of chain p, acting upon the large
pulley o.
In consequence of the raising of damper k, the bell, is eased so that the weight
of the damper cannot act upon the same, therefore bell b, will dip quickly into the
liquid, because the air contained therein will escape through valve d, the latter
litting itself from its seat. This done the counter-weight of damper k, will
commence to pull up the bell b, and will raise the latter out of the liquid in the
same proportion as air enters the inside of the bell through d'.
The speed with which the damper should drop at the beginning after fresh
fuel has been put on, is regulated beforehand by the position of d', to the cut-out c¹,
and is determined by the time taken for turning the coal into gas, which generally
requires five minutes. Meanwhile bell b, has been raised by damper k, so far that
the upper part of rod c, which is not twisted, but flat, has passed cap f, and now
the screw like part of the rod enters the cap, by which means cover d is clowly

page_text: turned in the direction of 1 Fig. 4, so that the air entering the bell gradually
increases, in consequence of which the dropping of the damper k takes place with
increasing speed. It is obvious that with valve c', and cover d and the shape of
the twist in rod e, which can easily be altered to suit any furnace and kind of fuel,
the dropping of dampers can be regulated at will. Whenever damper k has
dropped to the desired stationary position leaving a small area for the passage of
the gases, which otherwise might react and when more air is required for the
combustion of fresh fuel one needs only to give chain p a pull and raise the damper
to the proper height. Fresh fuel should be put on while the damper is still down
and before raising the same. When pulling chain p, bell b, drops down into the
liquid and lifting valve cover d, allows the air to escape, rod e by reverse motion at
the same time closing the area of hole d¹ to its original size.
If it should be desirable to close damper k at any given time, it is only necessary
to lift rod e a little thus lifting the valve cover from its seat and admitting more
air to the bell b, in consequence of which the latter will rise rapidly until it reaches
the cover of pipe a, and a corresponding falling of damper ke takes place. In
order that the twist in the rod e may always act properly the communication
between the damper k, and bell 6 must be arranged in such a way that the latter
must always be raised up to cover g, when the former has dropped to its lowest
point. This is easily effected by lengthening or shortening the little chain q
attached to crosshead h.
Whenever the furnace is to be shut down altogether and the damper to close the
flue entirely, the supporting part of chain 9 is simply extended by the necessary
number of links.
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. A draught regulator in which the position of damper k is regulated by a
twisted rod e acting upon valve c and valve cover d and in consequence upon bell b
in such manner that as soon as fresh fuel is put on the grate the damper k drops
slowly, but with increasing speed as combustion proceeds, as herein described and
set forth.
2. In combination with a draught regulator as described in Claim 1 the arrange-
ment that rode and with it valve cover d can be lifted by hand, in order that
damper k can be dropped at once to any extent and at any time at will, as herein
described and set forth.
Dated this 27th day of December 1894.
S. S. BROMHEAD,
97, Newgate Street, London, E.C., Patent Agent.