Improvements in Apparatus for Diminishing the Noise of Gases Escaping from the Exhaust of Gas Engines and the like.
Year: 1895

page_text: Date of Application, 26th Jan., 1895
Complete Specification Left, 4th Oct., 1895-Accepted, 9th Nov., 1895
TRUVIDIONAL OF MOTIVATION.
Improvements in Apparatus for Diminishing the Noise of Gases
Escaping from the Exhaust of Gas Engines and the like.
I, FELIX LOUIS SERRET, 37, Rue Sainte, Marseilles, France, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention has for its object a device for reducing the noise produced by
the escape of waste gases from the exhaust of gas engines, petroleum engines and:
the like.
This apparatus is arranged in such a manner as not to reduce the speed of the
escaping gases in the exhaust pipe which comes from the motor, but to reduce
their speed after they have entered into the apparatus by diverting the current
without offering resistance thereto, and in prolonging the period of the discharge
of the gases into the open air.
It is composed of two cylindrical portions each closed at one of its extremities,
and combined together so as to present a completely closed receiver. Each of
them bears a bent piece the diameter of which increases towards the interior of the
apparatus, and they possess at their ends a cone shaped projection on which the
current of gases inipinges. An annular dise is interposed between the two
cylindrical portions. This disc constitutes a diaphragm intended to break the
current of the gases passing through the apparatus. The gases coming from
the escape pipe of the motor enter the apparatus by a bent tube the diameter of
which increases as already described. When the current of gases, the speed of
which commences to lessen, arrives opposite the conical projection, this divides it
over the whole surface of the bottom of the apparatus without opposing resistance
to it, because the diameter of the cylindrical piece is very large relatively to that
of the bent tube. The current then strikes against the circular portion and rises
upwards. The gases then strike the central diaphragm, this produces a contraction
of the gaseous current which passes from the orifice and enters the upper cylin-
drical portion. The current of gases then strikes the curved side of the bent
outlet tube, turns around this bend passing through the annular aperture which
encircles it, strikes the upper part of the apparatus, and following the upper
conical projection passes into the outlet pipe.
The upper conical projection may be suppressed, also the tube need not
necessarily be conical, because the length of it and the time of discharge into the
open air can be regulated to a certain degree by the diameter of the entrance tube
for the gases into the apparatus.
My apparatus can be placed at any convenient point of the discharge pipe,
which enables it to be placed at any point considered desirable, whether upon a
roof or in an intermediate storey, or in a cellar.
My apparatus can of course be constructed upon any desired dimensions, or of
any suitable material and I reserve the right to vary the details to suit various
applications.
Dated this 26th day of January 1895.
W. P. THOMPSON & Co.,
Agents.

page_text: Improvements in Apparatus for Diminishing the Noise of Gases
Escaping from the, Exhaust of, Gas Engines and the like.
I, FELIX LOUIS. SERRET, 37, Rue Sainte, Marseilles, France, 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 :-
•
t
,the like.
This invention has for its object a device for reducing the noise produced by
the escape
of waste gases from gas engines, the exhaust of petroleum engines and
This apparatus is arranged in such a manner as not to reduce the speed of the
escaping, gases in the exhaust pipe which comes from the motor. but to reduce
their speed after they have entered into the apparatus by diverting the current
without offering resistance thereto, and in prolonging the period of the discharge of
the gases, into the open air.
In order to make my invention plain I have represented in the accompanying
drawing one modification of the arrangement which I have devised.
Fig. 1, is a vertical section of my apparatus made along the line 1, 2.
Fig. 2 is a horizontal section made along the line 3, 4.
Fig. 3 shows an elevation of the apparatus.
My apparatus is composed of two cylindrical portions a. b, each closed at one
of its extremities, and combined together. as shown in Fig. 1, so as to present a
,,completely closed receiver... Each of them bears a bent piece c. d the diameter
of which increases towards the interior of the apparatus, and they possess at their
end a cone shaped projection efon, which the current of gases impinges. An
annular disc g is interposed between the two cylindrical portions a b. This disc
constitutes a diaphragmn intended to break the current of the gases passing through
the apparatus. The gases coming from the escape pipe of the motor enter the
apparatus by a bent tube c, the diameter of which increases as already described.
When the current of gases, the speed of which commences to lessen, arrives
opposite the conical projection c, this divides it over the whole surface of the
bottom of the apparatus without opposing resistance to, it, because the diameter of
the cylindrical piece a is very large relatively to that of the bent tube c.
current then strikes against the circular portion h, and rises upwards. passing from
the space which is also relatively large. The gases then strike the central
diaphragm g, this produces a contraction of the gaseous current which passes from
the orifice; and enters the upper cylindrical portion b. The current of gases then
strikes the curved side of the bent outlet tube b, turns around this bend passing
through the annular aperture which encircles it, strikes the upper part of the
apparatus, and following, the upper.conical projection f passes into the outlet
pipe d.
The
The upper conical projection may be suppressed, also the tube d, need not
necessarily be conical, because, the length of it and the time of discharge into the
open air can be regulated to a certain degree by the diameter of the entrance tube
for the gases into the apparatus.
My apparatus can be placed at any convenient. point of the discharge pipe which
enables it to be placed at any point considered desirable, whether upon a roof or
in an intermediate storey, or in a cellar.
My apparatus cau of course be constructed upon any desired dimensions, or of
any suitable material and I reserve the right to vary the details to suit various
applications.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The apparatus for deadening the sound of escaping gases consisting essentially
of a closed receiver having at its centre an annular diaphragm and provided with
a pipe for the entrance and one for the escape of the gases, these two tubes forming
a bend of which the end which discharges into the apparatus is cone shaped and
directed towards conical projections arranged upon the two ends of the apparatus
and designed to guide the current of gases substantially as hereinbefore described
and for the purpose set forth and as shown in the accompanying drawing.
Dated this 4th day of October 1895.
W. P. THOMPSON & Co.,
31, High Holborn, London, W.C., Patent Agents for the Applicant.