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Патент USA US2121319

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2,1%,319
J. S. FLUORÍ JR., ET AL
1am-000mm MUFFLER
Filed May 4,- 195s
2 Sheets-Sheet l
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' J. S. FLUOR, JR.. ET AL
Q’nlpgl 5.1%
AIR- COOLED ~ MUFFLER
Filed May 4, 1956
2 Sheets-Sheet 2
Patented June 21, 1938
` 2,121,319
UNITED STATES PATENT OFFICE
,
2,121,319
AIR-COOLED‘ MUFFLER
John S. Fluor, Jr., and Park W. Ash, Santa Ana,
Calif., assignors to The Fluor Corporation Ltd.,
Los Angeles, Calif., a corporation of California
Application May 4, 1936, Serial No. 77,820
5 Claims. (Cl. Gil-31)
y
This invention has to do with air cooled muf
ñers for stationary engines, and relates particu
larly to improvements in muffler units wherein
the muffler proper is mounted within a shell or
r.
stack through which the cooled air is drawn by
the exhaust gas discharged from the muffler.
Our major purposes are to avoid overheating
the >mull‘ler enclosing shell, and to improve upon
the usual muffler installation of this type by
accomplishing greater cooling of both the muffler
and the exhaust gases.
The invention is parn
jacket, and thence through the inner jacket in
Contact with the exhaust pipe and mufller. In
the detailed description to follow, reference is ..
had to the accompanying drawings, in which: 5
Fig. 1 is a general View showing the double air
jackets about the exhaust pipe and muñler;
Fig. 2 is an enlarged view showing the muffler
and the surrounding shells, in vertical section; «10
Fig. 3 is an enlarged plan View on line 3-3 of
ticularly adapted to that type of air cooled muf
Fig. 2; and
fler wherein air is drawn into a conduit sur
Fig. 4 is a fragmentary section on line 4-4 of
Fig. 3, showing one of the muffler suspensions in
rounding both the
conduit including
surrounding shell)
space about that
exhaust pipe and muffler (the
the above mentioned muffler
from a pipe forming an air
portion of the exhaust pipe
that is jacketed by the conduit. Air cooled muli
fler units of that type are described in Patent
No. 1,966,620 issued to John S. Fluor, Jr., July 17,
1934, on Muffler, which discloses a system where
in `air is taken into the outer pipe from the at
mosphere outside the engine room, and is drawn
into the inlet end `of the exhaust pipe and muf
A to Oi ñer surrounding conduit at a point within the
engine room.
'
It has been found that in some installations,
by the time the cooling air reaches the passage
surrounding the muffler, the air has become
ce C heated to such a degree that it overheats the
shell or stack surrounding the muliler, and con
sequently causes the metal to oxidize and de~
teriorate rapidly because of the impossibility> of
coating it with a paint that will withstand the
high temperatures. In accordance with the in
vention, we overcome this diiñculty and protect
the muffler stack, by jacketing the latter with an
outer shell which provides a passage through
which air is drawn along the outer surface of the
40 rstack, and thence into the- air passage between
the mulller and the stack. By virtue of this ar
rangement, i. e. the provision of two concentric
air passages about the muffler, we avoidover
heating either cf the outer shells, and maintain
45 the outermost shell at a sufficiently low tempera
ture that a heatresistant paint may be kept on
it to prevent rusting and maintain a good appear
ance.
>
For the purpose of describing our invention, we
have shown in the accompanying drawings a
typical stationary engine air cooled mulller unit
in which the exhaust pipe extends from within
the engine room to connect with a vertically po
sitioned muffler at the outside, both the muffler
and exhaust pipe being jacketed so that the
.
cooling air is drawn from the outside atmos~
phere into the room through an outer cooling
detail.
.
In the typical form of muffler, installation
shown in Fig. l, the exhaust pipe IU which con
nects at II with the diagrammatically illustrated
'engine I2 within room I3, extends downwardly
through the ñoor I4 and then horizontally with- c*
in trench I5 tol the outside of the room.
The
outer end of the exhaust pipe connects at I6, see
0
Fig. 2, into the side of the vertically extending
muffler I'I, which, as will be understood, may be
of any suitable type and construction. Typi
cally, it is shown to comprise a cylindric shell
I8 having top and bottom closures I9 and 28, an
outlet pipe 2|, and a series of baille elements 22,
the details of which need not be described since
they comprise no part of the invention.
The muffler I'l is enclosed by a cylindric stack
23 concentric with and spaced annularly about
shell I8 to provide a passage 24 for the muffler
cooling air. The bottom of shell 23 is welded
or otherwise secured to a base plate 24a which is ¿35
fastened to the foundation 25 by anchor bolts 26.
The upper end of the stack supports a hood 21
comprising an outlet pipe 28 and a downwardly
flaring portion 29 welded at 3D to shell 23. The
exhaust pipe IIJ is jacketed by a pipe 3l having ‘40
an open inlet end 3.2 and an outlet end con
necting -at 33 with the muffler surrounding shell
23. It may be observed at this point that by
virtue of the upward discharge of combustion
gases from the mufiler outlet EI into the tapered »45
throat formed by portion 29 of the hood, there
is created an upward draft acting to draw air in
the directions indicated by the arrows, into the
inlet end 32 of pipe 3|, through passage 35 along
the exhaust pipe, and thence upwardly through
the annular passage 24 surrounding the muffler. 50
The air is :finally discharged, together with the
exhaust gases, through the stack outlet pipe 28.
The muffler I'I may be mounted within the
`stack in any suitable manner, although we pref- y55
2,121,319
2
erably employ a type of mounting that will> per
mit the muffler to shift horizontally in response
to longitudinal contraction or expansion of the
exhaust pipe, occurring as a result of its tem
perature changes. Typically, we have shown the
muffler to be mounted on a two point suspension
of the type constituting the subject matter of our
Patent No. 2,110,395, issued March 8, 1938, on
Air-cooled muffler. As illustrated in Fig. 3 the
10 individual suspensions, generally indicated at 36,
are located at diametrically opposite sides of the
mufller shell, and in a plane normal to the direc
tion of expansion and contraction of the exhaust
pipe. Referring now to Figs. 3 and 4, each of
15 the suspensions comprises a vertically extending
bolt 31 carried by an arm member 38 welded at
39 and 4U to the muffler outlet 2l and shell i8,
and secured to the upper end closure 4l of the
muffler by bolt 42. The muffler is vertically sup
20 ported on a coil spring 43 placed about the lower
end of bolt 31 and resting on bracket 44 mounted
on shell 23 and having a top flared surface 45
along which spring 43 shifts as the muffler is
shifted within the stack by expansion or con
traction of the exhaust pipe. Spring 46 placed
about the upper end of bolt 31 and bearing
against a bracket 41 attached at 48 to the stack
shell, imposes a yielding and vibration dainpening
resistance to upward movement of the muffler.
Lateral movement of the muffler within the
30
shell in a direction transverse of its direction
of movement in line with the exhaust pipe, is
yieldably resisted by a coil spring 49 carried on
bolt 50 and bearing against the outer surface 55a
35 of bracket 41. As shown in Fig. 3, surface 50a
extends parallel with the direction of expansion
and contraction of the exhaust pipe, and conse
quently serves as a guide for spring 49 so that
the muffler is confined to a straight path of
40 travel in its shifting movement.
Referring now to Fig. 2, the stack shell 23 is
surrounded by an outer shell 5I supported on the
base plate 24a and spaced at its upper end from
the hood 29 to permit air to be drawn, as indi
45 cated by the arrows, into the annular passage
52. The lower end of the hood is supported on
this outer shell 5I by brackets 53. Pipe 3| sur
rounding the exhaust pipe I0, is jacketed by an
outer pipe 54 connecting at 55 into the side of
50 shell 5I. The opposite end 54a of pipe 54 extends
upwardly about the inlet end 32 of pipe 3l and
is closed by a plate 55 clamped between flanges
55 on the exhaust pipe.
Thus it will be seen
that shell 5l and pipe 54 provide an outer air
jacket or conduit about the inner air conduit
(shell 23 and pipe 3l), and that both the muffler
and the exhaust pipe are double-jacketed to sub
stantially the muffler outlet.
In operation, the upward draft of air in pas
60 sage 24 created by the exhaust gas discharge
from muiller outlet 2f, causes cool air from the
atmosphere to be drawn through space 58 be
tween the hood and shell 5l, into passage 52,
and then through passage 59 within the outer
65 exhaust pipe jacket 54, into the inlet end 32 of
pipe 3l. From that point, and as previously ex
plained, the air is drawn through passages 35
and 24 in direct contact with the exhaust pipe
and muffler, and is finally discharged with the
70 combustion gases through the outlet pipe 28.
The downward circulation of air through the
annular passage 5?. effectively cools the stack
shell 23, and carries away the heat at a rate suf
ficient to keep the outer shell 5I at a compara
k75 tively low temperature. As a result, the outer
exposed surface of the latter may be protected
by a suitable coating or paint, and the unit kept
in good condition and appearance without hav
ing to continually repaint it.
We claim:
1. The combination comprising a vertically ex
tending closed muffler shell having a gas inlet
at its lower end and an outlet at its upper end,
a tube surrounding and spaced from said muffler
shell and forming an inner air passage, a con
duit surrounding and spaced from said tube,
and forming an outer air passage, the upper
ends of said air passages being closed from com
munication, the upper end of said conduit being
open to admit air, means connecting the lower
portions of said air passages so that the dis
charge of gas from the muffler outlet causes air
to be drawn downwardly through said outer pas
sage and then upwardly through said inner pas
sage into the muffler discharge gas stream, and
a hood connected to the upper end of said tube
and comprising a gas discharge pipe and a lower
portion extending outwardly over and above the
upper open end of said conduit.
2. The combination comprising a vertically ex 25
tending closed muffler shell having a gas inlet
at its lower end and an outlet at its upper end,
a tube surrounding and spaced from said muffler
shell and forming an inner air passage, a con
duit surrounding and spaced from said tube and
forming an outer air passage,
ting air to said outer passage,
said air passages being closed
tion, a foundation supporting
means for admit
the upper ends of
from communica
the lower ends of
said conduit and tube, an exhaust pipe extend- -
ing horizontally through said conduit and tube
to connect with the muffler, an air jacket sur
rounding Athe exhaust pipe and delivering air
into said inner air passage, means connecting
said outer passage with said air jacket and in
40
ner passage, and an outlet pipe connected to
the upper end of said tube and extending above
the muffler outlet.
3. The combination comprising a vertically ex
tending closed muffler shell having a gas inlet at
its lower end and an outlet at its upper end, a
tube surrounding and spaced from said muffler
shell and forming an inner air passage, a con
duit surrounding and spaced from said tube, and
forming an outer air passage, means for supply
ing air to said outer passage, the upper ends of
said air passages being closed from communica
tion, means for supplying air from said outer
passage to the lower portion of said inner pas
sage, the air being drawn into the mumer dis 55
charge gas stream, and a hood structure con
nected to the upper end of said tube and com
prising a gas discharge pipe surrounding and
extending above the muffler outlet, and a lower
portion extending outwardly over and above the 60
upper end of said outer passage.
4. The combination comprising a vertically ex
tending closed muffler shell having a gas inlet at
its lower end and an outlet at its upper end, a
tube surrounding and spaced from said muffler 65
shell and forming an inner air passage, a con
duit surrounding and spaced from said tube and
forming an outer air passage, the upper ends of
said air passages being closed from communica
tion and the upper end of said conduit being 70
open to admit air, means whereby the discharge
of gas from the muffler outlet causes air to be
drawn upwardly through said inner passage into
the muffler discharge gas stream, an exhaust
pipe extending horizontally through said con
2,121,319
duit and tube and connecting into the side of the
muii‘ler, an air jacket spacedly surrounding said
exhaust pipe and extending through said con
duit and tube to deliver air to said inner air
passage, and means for‘passing air from said
outer passage longitudinally of said jacket and
' in heat transferring
relation therewith, into the
interior of the jacket.
5. The combination comprising a vertically ex
10 tending closed muiiier ‘shell having a gas inlet at
its lower end and an outlet at its upper end, a
tube surrounding and ‘spacedw from said muiiier
shell and forming an inner air passage, a con
duit surrounding and spaced from said tube, and
forming an outer air passage, said tube and con
duit being closed at their lower ends, the upper
ends of said air passages being closed from com
munication, the upper end of said conduit being
3
open to admit air, means connecting said air
passages so that the discharge of gas from the
muíiier outlet causes air to be drawn downwardly
through said outer passage and then upwardly
through said inner passage into the muñier dis
charge gas stream, an exhaust pipe extending
horizontally through said conduit and tube and
connecting into the side of the muñier, an air
jacket spacedly surrounding said exhaust pipe
and extending through said conduit and tube to
deliver air to said inner air passage, and means
for passing air from said outer passage longi
tudinally along said jacket in a direction op
posite the direction of the exhaust gas flow, and
intoy the jacket.
‘
JOHN S. FLUOR, JR
PARK W. ASH.
15
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