Year: 1897

page_text: Date of Application, 22nd Dec., 1897-Accepted, 9th Apr., 1898
παρτονομισμ
433
A communication from JULES MICHEL MARIE TRUFFAULT, of 277, Boulevard
Pereire, Porte Maillot, Paris, in the Republic of France, Engineer.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of Middlesex,
Chartered Patent Agent; 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 relates to steam generators, its object being the construction of a
light, safe and powerful generator for use on motor cars, steam launches and the
like.
In the accompanying drawings which illustrate by way of example one
construction of steam generator according to the present invention,
Fig. 1 is a vertical central section of the generator which should preferably be
worked on the "flash" or "instantaneous generation" system,
Fig. 2 being a plan of the same;
Figure 3 is a longitudinal central section of a steam-controlling valve hereinafter
referred to,
Fig. 4 being a plan thereof.
With reference first to Figs. 1 and 2 A and B are concentric cylindrical casings
with a space C between them constituting an annular flue or jacket. Within the
casing B is a tube D which regarded in cross section has a rectangular exterior,
although the bore may as shown be cylindrical; this tube is coiled helically into the
form of a cylinder constituting a fire box or combustion chamber D¹, and the flat
sidės of adjacent portions of the tube are made to lie in contact with or in close
proximity to each other as shown in order to prevent the flame of a fire carried
upon the fire bars E at the lower portion of the cylinder of tubing from passing
between adjacent turns or portions of the tube. By this arrangement of the tubes
or portions of tube an important advantage is obtained, for although the heating
surface is slightly diminished by bringing successive turns together as described
the flame is prevented from attacking the metal of the tube except on the face
presented to the interior of the tubular cylindrical fire-box or combustion chamber,
so that should any portion of the tube give way it would do so upon the inner side
and leave the formation of the coil itself intact, and enable it to confine the effect
of the rupture mainly to the interior of the generator. The inner casing B is close
up to the outside of the tubular coil so as to aid in preventing any flow of hot gases
between adjacent sections of tube, and is provided at its upper end with openings B¹
affording.communication between the space within the coil of tube above the fire-
grate and the jacket space C, the lower portion of the outer jacket being provided,
with a flue A. The relative disposition of the openings B¹ and flue A¹ is such that
the products of combustion on leaving the upper end of the coil of tube are caused
to circulate around the exterior of the inner jacket so as to impart heat to the same
before leaving the generator by the flue A¹.

page_text: A2 is a fuel and air inlet tube extended from the top A³ of the generator into the
upper end of the combustion chamber D¹, the lower end of which is closed to the
passage of air by the plate A³, except that air. to aid in starting combustion can
be drawn up into the fire through the space between the fire bars E.
The outer casing A or the inner casing B, or both, can be dispensed with if
desired, in which case the products of combustion. would be removed through a
suitable conduit communicating with the top end of the combustion chamber.
F is the exhaust pipe of the engine which is led into the flue A¹ or other passage
by which the heated gases leave the generator. The delivery end F¹ of the exhaust
pipe F is very considerably reduced in cross sectional area relatively to the rest of
the pipe so as to produce an exceptionally sharp blast. When the motor is running
uphill or working against a heavy load there will be a strong blast so that the fire
and the generation of steam will both be more vigorous than when the engine is
exhausting less strongly under a lighter load; thus the intensity of the blast
automatically regulates the generation of steam in proportion to the demand upon.
the motor. And although back-pressure in the motor cylinder is increased by
reduction of the area of the nozzle of the exhaust pipe the loss of effective pressure
in the cylinder thus caused is more than compensated by the increased quantity of
steam produced under the action of the sharpened exhaust.
If desired the valves controlling the exhaust from the motor cylinders may be
operated by any mechanism which will move them rapidly at the commencement of
exhaust so that the latter may be sharper and more sudden than it would be if the
valve were operated by an eccentric in the ordinary manner.
· G is a blower pipe in communication at one end G¹ with the valve by which.
steam can be supplied to it, and at the other end G2 opening into the flue A¹ in
proximity to the exhaust nozzle F¹; so that it can be employed as a blower to
increase the draught when necessary.
H is a pipe for supplying steam from the generator to the motor. The liquid for
evaporation is preferably admitted to the coil of pipe D at the end D2 passing as
steam or steam gas" into the casing J of a sliding valve presently to be described,
by which it may be allowed to pass into either or both of the pipes G H.
"
If desired the exhaust flue A¹ or a branch therefrom, may, as indicated in dotted
lines in Fig. 1, be caused to lead into an ash-pit A* beneath the fire bars E, so that
the exhaust steam may pass into the fire and thus be rendered invisible, and the
combustible constituents of the gases coming from the fire re-delivered to it in
order to be completely burnt.
With reference now to Figs. 3 and 4 which illustrate the steam controlling valve
to which in Figure 1 the pipes G and H are connected, the casing J is provided
with three connections J1 J2 Js, the connection J¹ affording a passage way by which
steam from the generator is led into the chamber J, whence passages J5 Je proceed,
the former to the main steam pipe (such as H Fig. 1) and the latter to the blower
pipe (such as G Fig. 1). Within the chamber J is a sliding valve K operated by
a rod K¹ which passes to the exterior through a stuffing-box J' and is capable of
being operated to cause the sliding valve to open one or other or both of the
passage ways J5 Jo, so as to permit steam to pass either to the main steam pipe or
to the blower or both as desired. It is found that cocks and the like do not work
satisfactorily when employed to control the passage of steam from a generator of
the type described, so that the employment of a sliding valve becomes necessary.
The tube D need not be coiled into a cylindrical coil, nor need it be of rectangular
cross section, provided that it is flattened or otherwise shaped so as to lie close to,
adjacent tubes or portions of tube for the purpose herein before described.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent and in what manner the
same is to be performed, I declare that what I claim is :-
1. In a steam generator tubes or portions of a tube such as D flattened or

page_text: otherwise shaped so as to lie in contact or close proximity substantially as and for
the purpose described.
2. In a steam generator the combination with a tube or tubes such as Darranged
close together to form a combustion chamber of a casing B closely encircling the
exterior of that chamber for the purpose described.
3. The combination with a steam generator of the kind described of a flue to
receive the exhaust steam and products of combustion and deliver them to the
fire substantially as described.
4. The combination and arrangement of parts constituting the complete steam
generator substantially as described and illustrated in the accompanying drawings
with or without a valve of the kind illustrated in Figures 3 and 4.
Dated this 10th day of December 1897.
BUULT & WADE,
Agents for the Applicant.
J. TRUFFAULT.