Improvements in or relating to Carburettors for Gas Engines.
Year: 1899

page_text: Date of Application, 9th Nov., 1899-Accepted, 9th Dec., 1898
COMPLETE SPECIFICATION.
Improvements in or relating to Carburettors for Gas Engines.
Wo, LUCIEN LHOTEL and FREDERIC PLANCIER, both of No. 42, Rue de Bondy,
Paris, in the Republic of France, Mechanics, do hereby declare the nature of
this invention and in what manner the same is to be performed to be particu-
larly described and ascertained in and by the following statement:-
The present application for Letters Patent relates to an improved carburettor
applicable to explosion engines in which a mixture of air and of a hydro-carbon
is used.
Our carburettor comprises a combination of organs of fixed function, and
capable of regular and permanent control, variable according to the power of
the engine or the richness in hydrocarbons of the explosive mixture made use
of. It consists of a receptacle enclosing in at its base an annular receiver into
which the hydrocarbon is conducted by a special pipe connected to the supply
reservoir. The receiver being completely water-tight, only distributes the
liquid in proportion to the requirements of the engine; consequently this causes
the first drop of the liquid contained therein to have the same combustion
value as the last, without any change of the carburetting. By this means taps
or the like, and consequent hap-hazard adjustments can be dispensed with. The
regulation of the carburettor is effected at the workshop by the maunfacturer
according to the power of the engine.
or more
The hydrocarbon can only escape from the receiver through one
amall perforations, which are covered by a valve in one piece with an automatic
mising dire which agitates the mixture of air and vapour.
Air is drawn in all round the liquid receiver on the aspiration stroke of the
engine, which air passes through the perforations of the disc valve, causing
the same to rotate on its axis; an in-rush of the hydrocarbon is thus caused
in a jet which breaks against the valve, the rotution of which assures a
thorough mixture.
For the better comprehension of the invention we have illustrated it in the
accompanying drawing in which:
Figure
is an outside elevation of the carburettor.
Figure 2 is a vertical section.
Figure 3 is a perspective view of the hydrocarbon receiver.
Figure 4 is a section shewing the carburettor provided with a casing or
double envelope for circulating a heated fluid for maintaining the apparatus
5 at a temperature favourable to its proper working.
The tubular metal box a is formed of two parts r,, one screwed inside the
other or joined together in any other suitable manner; the lower part serves
as inlet chamber and the upper part serves for the mixing chamber. In the
inlet chamber is enclosed the hydrocarbon receiver consisting of a hollow
10 vessel into which the liquid is conducted from the supply reservoir by the
tubular socket c into which is inserted the screw plug d. One or more very
small apertures are made in the top of the receiver b for the escape of the

page_text: hydrocarbon admitted into the said receiver. The top
of larger diameter than the body of the receiver. In this manner projections
and the bottom are
are formed which have holes pierced near their edges for the passage of the
air. The top y rests on an inside ledge of the chamber and is kept in place
there by the bottom of the chamber when the parts are joined together.
The exit apertures are covered by a valve fin one piece with a perforated
dise g, this valve is provided with a guiding rod passing axially through the
receiver on the upper part of which it is held in contact by means of a
spring coiled round the aforesaid rod j.
A
The action of the valve is limited and regulated according to need by a
check rod the screw threaded portion of which passes through the top m of
the mixing chamber r, the height being adjusted by means of the nut n.
cap o covers the regulating rod 7. The mixing chamber r is provided with a
suction pipe which is connected to the motor.
is
Air is admitted into the apparatus at the bottom which is provided with a
screen with wire gauze for keeping out dust. The funnel or screen g
connected to the bottom of the apparatus by means of an elbow joint, which
allows of the opening being turned towards the engine so as to admit air which
has been slightly warmed by contact with the motor before being introduced
into the apparatus.
The screw plug conducting the hydrocarbon to the receiver is likewise
provided with a movable perforated stopper with one or more pieces of wire
gauze in order to keep out impurities or solid bodies which might be contained
in the liquid.
screen
The working of the carburettor is very simple and perfectly uniform.
The return stroke of the motor causes the aspiration of the air through the
passes through the apertures in the edges of y and z respectively,
and through those of the valve disc g effecting the rotation thereof and the
raising of the valve in unison with the return stroke of the motor.
the raising of the valve, a jet of liquid gushes through the apertures e and a
During
sprays against the bottom of the said valve. Air and hydrocarbon are thus
intimately mixed before passing into the suction pipe which conducts the
mixture to the motor cylinder.
In certain cases we may arrange on the apparatus a pipe with regulating
dises for admitting cold outside air to the interior, in order to modify the 3
carburetting for various powers of the engine without altering the interior
regulating parts.
By a modification illustrated in Figure 4 we may arrange round the inlet
chamber a double casing in which circulates a heated fluid.
utilise the escaped gases which pass in through and escape by the lower 4
We preferably
opening . This arrangement prevents any condensation of the hydrocarbon
vapours and moreover by economy of combustible produces the most favourable
conditions for obtaining a good mixture.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declaro that what 44
we claim is :-
1. A carburettor for gas engines comprising the combination of a receptacle
for the admission of air and hydrocarbon, with a mixing chamber, said admission
chamber being provided with a hydrocarbon receiver the opening or openings
of which for escape of liquid are closed by a valve disc, so arranged as to be 50
raised by the curieut of air aspirated by the engine and rotated by means of
the said air passing through it for the purpose of thoroughly commingling the
mixture in the mixing chamber: said chamber being provided with organs for
regulating the issue of the liquid hydrocarbon according to the power of the
engine, substantially as described.
2. In a carburettor as set forth in Claim 1 the parts for regulating the issue
55

page_text: of the liquid, consisting of a check rod, regulatable for limiting the rising of
the valve disc, substantially as described.
3. In a carburettor as set forth in Claim 1 the constructional arrangement
for maintaining the apparatus at a temperature favourable for the mixture
consisting of the double casing round the admission chamber of the carburettor
for allowing a hot vapour, preferably the escaped gases from the motor, to
circulate therein.
4. In combination with a carburettor for explosion engines, the fluid
receptacle constructed and operating substantially as described and shewn.
Dated the 9th day of November 1890.
W. P. THOMPSON & Co.,
322, High Holborn, Loudon, W.C., Patent Agents for the Applicant.