An Improved Method of and Apparatus for Silencing or Rendering Practically Noiseless the Exhaust from Gas or Petroleum Engines.
Year: 1888

page_text: An Improved Method of and Apparatus for Silencing or Rendering
Practically Noiseless the Exhaust from Gas or Petroleum
Engines.
I, FREDERIC GEORGE NOBBS of 6 Culverland Road, Saint James's Exeter, in the
County of Devon, Gentleman 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 consists of an improved method of and apparatus for the purpose
of silencing or rendering practically noiseless the exhaust from gas or petroleum
Engines.
The improved method of treating the exhaust consists of discharging the same into
an apparatus which is specially devised for the purpose of deadening the sound thereof
instead of carrying the same pipes and discharging it at the side or on the top of the
building or other place in which the Engine is working. Hence by the use of this
invention a great saving in the exhaust pipes is effected and the nuisance caused by
the exhaust is abated.
The apparatus is intended to be built in the ground in any convenient locality or to
stand upon the floor beside the Engine the exhaust pipe from which is led into the
said apparatus, and the exhaust there discharged.
The said exhaust pipe terminates in a cone for the purpose of dispersing the exhaust
and the sound issuing therefrom when discharged.
The apparatus consists of a vessel containing ordinary gas coke, or any other
material which is sufficiently porous to absorb the vapour from the exhaust, enclosed
in a wooden or other casing with a lattice work ventilating cover.
If it is found convenient to stand the exhaust silencing apparatus upon a floor an
additional outer casing is provided for the said apparatus and a packing of saw dust or
other non-conductor of sound is placed between the two casings, the thickness of the
packing varying with the size of the engine; and with other circumstances.
And in order that my invention may be more fully understood and carried into
practice I will now proceed to describe the same with reference to the accompanying
drawings in which similar letters indicate corresponding parts throughout.

page_text: Figure 1 shews a Gas Engine with my apparatus,built in the ground.
Figure 2 is an enlarged view of the exhaust silencing apparatus used in Figure 1.
Figure 3 shows a Gas Engine working upon a floor with my apparatus standing
thereby, and
Figure 4 is an enlarged view of the exhaust silencing apparatus used in Figure 3.
The drawings illustrate a Gas-engine fitted with my apparatus, but I wish it
to be clearly understood that the invention is equally applicable for silencing the
exhaust of petroleum engines.
The exhaust pipe B of the engine A is led into the condensing chamber D ; the said
condensing chamber D is filled with ordinary gas-coke or other material which will
absorb the vapour arising from the exhaust. On to the end of the exhaust pipe Ba
cone-shaped piece is fitted for the purpose of dispersing the vapour and breaking the
sound emanating therefrom. A lattice-work or other suitable ventilator F is fitted on
the top of the condensing chamber D, to carry off the fumes etc. arising therefrom.
The apparatus is provided with an outer casing E', and a packing of saw dust or other
non-conductor of sound G is placed between the two casings E and E¹ as shewn in
Figures 3 and 4 for the purpose of more effectually deadening the sound when the
apparatus is standing upon a floor.
Having now particularly described and ascertained the nature of my said inven-
tion and in what mannor the same is to be performed, I doclare that what I
claim is :-
-
(1) The method of deadening the sound of the exhaust issuing from gas or petroleum
engines substantially as hereinbefore set forth.
(2) The combination of the cone-shaped piece C condensing chamber and vapour
absorbing material D with ventilator F substantially as and for the purpose herein-
before set forth with reference to Figures 1 and 2.
(3) The combination of the cone-shaped piece C, condensing chamber and vapour
absorbing material D, Ventilator F, outer casing E¹ with a packing G of non-
conducting (of sound) material, substantially as and for the purpose hereinbefore set
forth with reference to Figures 3 and 4.
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