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Dec. 24, 1946.
'
J, P, TysKEwlcz
2,413,086
MEANS FOR REDUCING BACK PRESSURE IN SILENCERS
Filed Jan. 10, 1945
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INVENTOR
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ATTORNEYS
Patented Dec. 24, 1946
2,413,086
UNITED STATES PATENT OFFICE
'
2,413,086
MEANS FOR REDUCING BACK PRESSURE
IN SILENCERS
John P. Tyskewicz, Hartford, 001111., assignor to
The Maxim Silencer Company, Hartford, Conn.,
a corporation of Connecticut
‘
Application January10, 1945, Serial No. 572,129
4 Claims.
(Cl. 181-58)
1
The present invention pertains to devices for
silencing the exhaust noise of internal combustion engines and the like, and at the same time
removing from the exhaust gases entrained dirt,
sparks and the like.
2
duits I‘! which open to chamber 15 at an angle to
impart a whirling motion to the gases. Sparks,
dirt, etc., thrown outwardly to the smooth wall of
the chamber l5 are collected in a dirt collect
ing tube [8, through openings 19 formed in the
More particularly the present invention relates
wall l0, and fall into a dirt box 26 at the lower
end of the tube. The discharge conduit 2| is pro
vided with the conical section 22 having its small
whereby the back pressure is materially reduced
end connected to the inner end of the outlet
over present structures.
10 conduit.
I have discovered that a marked reduction in
In one form of exhaust silencers and cleaners
back pressure may be secured by replacing the
it is customary to so introduce the gases from
deep, curved vanes of the Bourne patent with one
the silencing chamber into the dirt separating
or more relatively shallow crossed interrupter bars
chamber as to impart a whirling motion to the
gases whereby the solid material is thrown by 15 23, preferably positioned at the large end of the
conical section. The depth of the interrupter
centrifugal force to the sides of the whirl cham
bars 23 may vary but in any event an unparti
ber where it is collected. It has been common
tioned and uninterrupted space 24 of substantial
practice to provide the inner end of the conduit
to an improvement in the construction and ar
rangement of the outlet portions of such devices
axial depth is provided between the interrupters
conical mouth for funneling the whirling gases 20 and the small end of the conical section. Pref
erably one half to three quarters of the axial
into the discharge conduit. Such an arrange
depth of the conical section is unpartitioned and
ment is shown in the patent to Roland B. Bourne
open from side to side, the remaining half, or
2,265,343 issued December 9, 1941. The vortex
through which the gases are discharged with a
created at the small end of the discharge cone
tends to create a back pressure and in the Bourne
patent it is proposed to reduce this back pres
sure by providing one or more longitudinally
disposed vanes extending from the large to the
small end of the cone.
While there is an effective reduction of back rm
pressure by the use of vanes in the cone as pro
posed by Bourne a substantial degree of back
pressure is present and it is the object of this
invention to secure a further and substantial
reduction in the back pressure at the entrance 1-;
to the discharge conduit.
In the accompanying drawing the present in
v vention is disclosed embodied in a spark arrester
silencer of the same type as is shown in the
above mentioned Bourne patent.
In the accompanying drawing:
Fig. 1 is a side view of the device, partly broken
away; and
Fig. 2 is a fragmentary perspective view show
ing the interior arrangement of the discharge
one-quarter, being occupied by the interrupter
bars. Approximately within the proportions men
tioned the depth of the bars is not critical.
Preferably two interrupter bars are used as
shown but in some instances the use of three
secures slightly better results. For bars of a
given depth the effectiveness in reducing back
pressure decreases as they are disposed farther
along the axis of the conical section toward its
small end. Preferably the bars are therefore
placed at or closely adjacent the large end of
the conical section. Preferably also for usual
conditions the conical member is so constructed
that the angle between the surface elements of
the conical member and the axis thereof is be
tween thirty and sixty degrees and the slant
height of the conical member is preferably made
approximately equal to, or slightly less than, the
diameter of the small end of the conical member.
The action of the interrupter bars appears to
be one of breaking up the whirl of the exhaust
gases as they leave the whirl chamber. The
Referring to the drawing the spark arrester is
centrifugal forces tend to keep the gases whirling
in the region, adjacent the walls of the chamber.
shown as generally comprising a cylindrical cas
ing l0 having an inlet header H and an outlet
Work is necessary to break up this action. The
breaking up of the whirling action causes turbu
header l2.
A transverse partition I3 divides the casing in
lence and the shallow interrupter bars represent
the best compromise between induced turbulence
cone.
to a silencing chamber I4 and a whirl chamber
losses incurred by the presence of the bars, bal
anced against the work necessary in extracting
the whirling gases from the whirl chamber.
chamber Hi to chamber l5 through silencing con: 55 The principles of the invention are of course
I5. The discharge gases enter the chamber l4
through a conduit l6 and are introduced from
2,413,086
3
not limited to the particular form of spark-ar
rester silencer described but may be equally well
applied to any device of the class having a conical
outlet member.
I claim:
1. In a spark arrester silencer having a whirl
4
3. In a spark arrester silencer having a whirl
chamber and a gas outlet connection including
a substantially imperforate open-ended conical
member projecting into the whirl chamber, and
one or more interrupter bars positioned in said
chamber'and a gas outlet connection including
a substantially imperforate open-ended conical
conical member and occupying between one
quarter and one-half of the axial depth of the
member, the remainder of the member being
member projecting into the whirl chamber, and
unobstructed.
one or more interrupter bars positioned within
a substantially imperforate open-ended conical
member projecting into the whirl chamber,‘ and
4. In a spark arrester silencer having a whirl
chamber and a, gas outlet connection including
a substantially imperforate open-ended conical
member projecting into the whirl chamber, a pair
of crossed interrupter bars positioned in said
conical member and occupying between one
quarter and one-half of the axial depth of the
member; the remainder of the member being un
obstructed, the slant height of the conical mem
one or more shallow interrupter bars positioned
' ber approximating the diameter of the small end
the large end of the conical member, a portion
of the conical member of substantial axial depth
between the interrupter and the small end of the
conical member being unobstructed.
_
2. In a spark arrester silencer having a Whirl
chamber and a gas outlet connection including
at thev large end of the conical member’ and 20 of the member and the surface elements of the
conical member making an angle of " between
extending inwardly towardthe small end of said
thirty and sixty degrees with the axis thereof.
member, theconical member for at least half of
JOHN P. 'I‘YSKEWICZ
its depth being unobstructed.
‘
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