Improvements connected with the Blast Apparatus of Locomotive and similar Boiler Furnaces.
Year: 1894

page_text: Date of Application, 22nd Aug., 1894-Accepted, 16th Feb., 1895
COMPLETE SPECIFICATION.
Improvements connected with the Blast Apparatus of Locomotive
and similar Boiler Furnaces.
I, THEODOR LANGER, of Nussdorferstrasse 21, of Vienna IX, in the Empire
of Austria, Engineer, do hereby declare the nature of my said invention and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
With locomotive or similar boiler-furnaces, if the regulator is closed during the
generation of gas from the fuel, so that the current of air artificially generated by
the exhaust-steam passing from the cylinders is cut off and the suction of air
necessary for effecting combustion ceases, the locomotive or other furnace smokes,
as a natural consequence.
Even with furnaces provided with smoke-consumers, in which, besides the bottom
air, also top air is fed at the proper time and in suitable volume, during the
generation of gases in the combustion chamber, the smoking cannot be totally
avoided by means of the regulator if the latter must be closed shortly after charging
the furnace.
The object of this invention is to remove this defect present with furnaces
provided with devices for distributing top-air during the generation of gas and this
I effect in such manner that for generating the requisite current of air the blast
pipe is set in operation immediately the regulator is closed during the generation of
gas, i.e. when the current of air generated by the exhaust steam from the cylinder
ceases to pass off.
Referring to the accompanying drawings;
Fig. 1 is an elevation of the improved device ;
Fig. 2 (a, b & c) are sectional views of a double-valve, employed in connection
with this device.
The device is so constructed that the fresh steam coming from the boiler
by way of pipe 1 can only pass through the canals 2-7 and pipe 8 to the
blast-pipe and operate same, if both valves 9 and 10 are simultaneously opened.
Valve 10 is controlled by the device for supplying the top air to the fire-box in
such manner, that it opens at the cominencement of each period of gas generation,
and closes again when same ceases to be generated.
Valve 9 however remains closed when the regulator is open, whereas it is opened
by the closed regulator by means of a suitable lever connection, so that therefore
the blast-pipe only operates when the regulator is closed during an incomplete
period of gas generation. Fig. 1 shows the arrangement of such double-valve in
combination with other parts of the device for automatically distributing the top
air in the fire-box.
The operation of the device is as follows:-
When the furnace door is opened for charging the furnace, the cataract 11 or
device for regulating the feeding of air as specified in my Patent No. 15542 dated
30th August 1892, is operated in such manner that the lever 12 arranged on the
hinge-spindle or bolt of the furnace-door and rigidly connected to the cam 21, is
carried forward or rotated by an arm 13 rigidly fixed to the door-spindle, the piston
of the cataract 11 being thereby raised by means of links 14 and 15.
Ou closing the furnace door the arm 13 returns and releases the lever 12
and cataract 11. These latter return into their position of rest either rapidly
or slowly according to the adjustment of the regulating screw 16, and thus
ID 79

page_text: regulate as to time and volume, the supply of top air into the fire-chamber through
the register 17.
The opening of the register can further be controlled in accordance with the
position of the regulator by a wedge 18 connected to the regulator, transmitting
more or less of the rotary motion of the lever 12 in connection with the cataract 11
to the lever 19 actuating the register 17.
Simultaneously with the lever 12 rotates the small cam 21, connected to same
by link 20, rotably mounted on the spindle of the furnace door, said cam acting
on the valve 10 in such manner that when the cataract is in operation the
valve 10 is opened, and closes again with the gradual return of the piston of the
cataract.
Valve 9 however is so controlled by levers 22-24 and slot 25 that it is kept
closed by spring 26 when the regulator is open, whereas it is thrown open again by
means of the levers 22-24 when the regulator is closed.
If, therefore, the cataract is still in operation or not yet run down and the valve 10
is still open, and if, now, the regulator is closed and the valve 9 consequently opened,
steam from the boiler can pass through pipe 1, canals 2, 3, valve 9, canals 4, 5,
valve 10, canals 6, 7 and pipe 8 to the blast-pipe and thereby draw in the requisite
top and bottom air for effecting the smokeless combustion of the fuel so long as the
gas continues to be generated.
As soon as this generation of gas is finished, or the regulator opened again
(whereby the necessary current of air is generated by the exhaust steam from the
cylinder) the connection of the steam-supply pipe 1 with the blast pipe is cut off
by the valves 10 and 9 respectively.
By suitable adjusting the stems or spindles of the valves 9 and 10 the suction-
action of the blast pipe actuated by the double valve can be regulated.
With those boiler furnaces in which steam is employed for inixing the gases in
the fire-box, the double valve, as shown, is preferably connected to the pipe 1
supplying steam to the distributing pipe 27 in the boiler, the auxiliary blower and
pipe 27 being thus fed from the same pipe 1.
Having now particularly described and ascertained the nature of my inven-
tion and in what manuer the same is to be performed I declare that what I
claim is :-
1. Improved device for automatically setting the blast-pipe of boiler furnaces
into operation, in which top air is fed periodically and in proper volume during the
generation of gas in the fire-box, characterized by the arrangement of valve
attachment in connection with the pipe leading to the blast pipe, in which attach-
ment one valve is opened at the commencement of the generation of gas and closed
again when the gas ceases to be generated, whereas another valve arranged in front
of the other is in connection with the regulator in such manner, that it closes when
said regulator opens, and opens when same closes, so that the blast pipe can only
operate during the generation of the gas and when the regulator is closed, substan
tially as described and shown in the drawing.
2. A modification of the valve attachment described in Claim 1 in which a
double valve (Fig. 2 a, b, c) is in such connection with the pipe (27) that the
valve (10) is held open during the generation of gas by a cam (21) connected with
the lever 12 whereas the valve (a) opens only when the regulator is closed by
levers (22, 24), substantially as described and shown in the drawing.
Dated this 22nd day of August 1894.
W. P. THOMPSON & BOULT,
Agents for the Applicant.