An Improved Automatic Draught Regulator for Furnaces.
Year: 1898

page_text: Date of Application, 19th Jan., 1898-Accepted, 19th Feb., 1898
COMPLETE SPECIFICATION,
An Improved Automatic Draught Regulator for Furnaces.
I, STANISLAW STUCKGOLD, of 16, Zórawia, Warsaw, in the Empire of Russia,
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:
This invention has for its object a device for automatically regulating the
draught in steam boilers. The arrangement enables the stoker to devote his whole
attention to the condition of the fire and water, whilst preventing waste of coal and
an unnecessary evolution of smoke and soot. A further advantage consists in the
regulation being capable of being effected by hand without further trouble after
the disconnection of a small lever.
In the accompanying drawings:
Figure 1 is vertical section of a boiler arrangement with regulator;
Figure 2 a draught gauge or indicator with a diagram of the switch arrange-
ment for the electrical part of the invention.
Figure 3 a draught gauge or indicator for direct electric operation.
a
As may be seen in Figure 1 of the drawings the operation of the smoke slide or
damper 6 at the front end of the boiler which is counterbalanced at the rear end
by a weight a, takes place by means of a chain e carried over rollers c and over
a chain wheel d. A cog wheel f is mounted on the chain wheel d and with this
second wheel a rack engages. The draught in the flue q is indicated on
draught gauge g, Figure 2, which is connected with the flue by means of a pipe p.
The scale of this draught gauge g has in the centre an insulation piece whilst to
right and left it is composed of metal strips i insulated from the index m, to
which strips electric conductors 1 and 3 are attached. The index m of the draught
gauge is provided with a brush n and connected by means of the conductor 2,
with a battery o. A switch 4 allows the battery to be switched off. Electro-
magnets and are influenced from the draught gauge, the electro-magnet /
being excited when a partial vacuum is formed as then the index m of the draught
gauge 9 moving to the left closes the circuit 1 and 2, Figure 2, whilst too little
draught causes a movement of the index m to the right and excites the electro-
magnet k by causing a closing of the circuit 2-3, the switch 4 being assumed to
be closed. The armatures of the magnetsk and are mounted on levers 7 and s
pivotally mounted in frames or standards r¹ and s¹ and pressed by spiral springs t
against fixed stops t¹. Valves u and are suspended on the levers r and s and
are opened by the attraction of the electro-magnets 7 and k. The rack engaging
with the cog-wheel f is attached to the plunger of an hydraulic cylinder w, which
latter receives its operating water through a pipe y and discharges its waste water
through a pipe_z. The mode of working is as follows:-
Under normal working the index of the draught indicator or gauge stands over
the insulation piece h. It moves to the left when the coals are burnt down and the
draught has therefore become too great. The circuit 1 and 2 is thereby closed
and the electro-magnet is excited. The latter attracts the armature and lever s

page_text: and opens the valve of the water discharge pipe. The water runs away by its own
weight, and thereupon the weight of the plunger and of the rack a attached to the
plunger cause the rack to descend and move the wheels f and d to the right
whereby the dampers 6 are lowered until the draught has again become normal
an the index m of the draught gauge 9 has again moved on to the insulation
piece h. The lever s is then again released and closes the valve by means of the
spring t. The reverse action takes place when fresh coal is thrown on the fire.
More draught is then required, the circuit 2 and 3 is consequently closed, the
valve opened and the rack a raised which movement is also imparted to the
damper. Instead of an hydraulic piston w a small steam engine or electro-motor
may of course be employed in which the rack & may also be replaced by a worm
gear.
in
In regulating the smoke slide or damper by means of an electro-motor, the
throwing into action of the latter may take place directly from the draught gauge
without the insertion of intermediate electro-magnets. As may be seen
Figure 3 of the drawings in this draught gauge a disc B is placed on the spindle A
of the meter on which disc there rub two springs C mutually insulated and con-
nected with the conductors 1 and 3. A piece of insulated metal 1 mounted on the
dise B and electrically connected with the spindle A closes one or other circuit on
the movement of the index E.
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:
1. A device for automatically regulating the draught in furnaces, characterized
by the index (m) of a draught gauge which is moved to one side or the other from
its central position which corresponds to the normal strength of draught, by an
increase or diminution of the draught, being adapted by means of a contact
piece (n) to close the circuit of one or the other of two electro-magnets (kl), the
armature ( s) of which sets in action a motor or engine (wa) for operating the
adjustment of the damper (b) substantially as hereinbefore described.
2. The general construction and combination of parts taken as a whole, form-
ing the improved automatic draught regulator for furnaces, substantially as here-
inbefore described and illustrated.
Dated this 18th day of January 1898.
W. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.