IMPROVEMENTS IN APPARATUS FOR GENERATING PRESSURE FOR WORKING ENGINES
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Alexander Melville Clark at the
Office of the Commissioners of Patents on the 6th December 1883. Commu-
nicated to him from abroad by Joseph André Costa, of Paris, France
ALEXANDER MELVILLE CLARK of the firm of A. M and W. Clark, of 53 Chancery
Lane in the County of Middlesex, Fellow of the Institute of Patent Agents
"IMPROVEMENTS IN APPARATUS FOR GENERATING PRESSURE FOR WORKING
ENGINES" [communicated to him from abroad by Joseph André Costa, of Paris,
France]
This Invention relates to an auxiliary pressure generator with an internal
furnace or heating chamber having no outlet to the atmosphere. This apparatus
serves for working engines operating by means of gaseous pressure. It may also
be used for superheating the steam of steam boilers or other chambers containing
steam or other gaseous fluid. The furnace is heated preferably by means of a
burner supplied with illuminating or other combustible gas the supporter of
combustion being air oxygen or other gas.
In order that the Invention may be more readily understood I will proceed to
describe the same with reference to the accompanying drawings which represent
the invention by way of example.
Figure 1 represents a central vertical section of the generator, and figure 2 a
similar section taken through the safety valve. A, B, C, D, is a chamber centrally
within which is a cylinder e, f, g, h which is open at top and closed at bottom by
the bottom A, D of the chamber A, B, C, D. Surrounding this cylinder is a bell
chamber i, j k, l, which may be lowered thereon by means of a screw M so as to
hermetically close the said cylinder e f, g, h. P, Q, R, S, are two pipes placed
opposite one another by which the cylinder e, f, g, h, may communicate with the
exterior by removing covers t u operated by screws v, which close said pipes, the
covers and their supporting frames being pivoted at y z so as to swing out of
the way.. The products of the combustion which takes place in cylinder e f, g, h
pass out together with the air which is admitted at coiled pipe 10 the two
gases on arriving at the top of the cylinder becoming mixed with the steam
from the water contained in the apparatus. The steam serves to lubricate the slide
valves and working parts of the engine and the water which is in the apparatus

page_text: serves to wash the products of combustion as will be seen from figure 1. By
lowering the bell i j, k,l down on the top of the cylinder the gas burner may be
inspected, dismounted and refixed without emptying the generator.
The level of the water may be varied, but in order to obtain the maximum of
useful effect, the smallest possible quantity of water should be evaporated as is
compatible with the proper lubrication of the slide valves and piston of the Engine.
The gas
and air are supplied from reservoirs kept filled by pumps driven by the
engine itself, the supply of gas and air in the burner being regulated in the desired
proportions for ensuring perfect combustion by means of suitable regulators placed
upon the supply pipes, the said regulators being moreover placed in communication
with the generator and actuated by the pressure therein in order that the flame
may be reduced when the pressure in the generator rises. owing to a diminution in
the work done by the engine. When the engine stops work the reservoirs remain
filled and their pressure and capacity suffice to again start the engine, so that it is
only necessary to fill them once for all after which they need no further attention.
Any other fuel than a gas may be used with this generator, for instance solid or
liquid fuel and any other supporter of combustion than air or oxygen may be used.
The generator may also be used in connection with a hot air engine working
without water. Any other liquid more or less volatile than water may also
be used.
The liquid supply pipe 11 is arranged to deliver it in the jacket 1, 2, 3, 4
surrounding the cylinder e, f, g, h in order to prevent it overheating. Figure 3
represents a burner by the employment of which the pump and reservoir of gas
may be dispensed with.
The air is supplied to this burner at a pressure of from 1 to 11/, atmospheres
above that in the generator. The air is discharged from a contracted nozzle a and
its high velocity carries with it the gas introduced at pipe b at the same pressure
as the public mains, the action resembling that of the Giffard injector. A gas
regulator is employed to prevent two great a quantity of gas being drawn in and
an air regulator communicating with the generator maintains a proper proportion
and pressure according to the quantity of air expended. Figure 4 represents a
diagram, giving the positions of the different parts of the engine: A is the
generator, B the engine cylinder C the air reservoir D the water feed pump E the
gas feed pump, F an air pump and G regulators of the air and gas admitted.