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Патент USA US2113055

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April 5, 1938.
H_ MGCURDY
FREQUENCY AND WAVE LENGTH SOUND CHANGER
Filed May 17, 1937
2,113,055
2,113,055
Patented Apr. 5, 1938
UNITED STATES PATENT OFFICE
2,113,055
FREQUENCY AND WAVE LENGTH SOUND
‘
CHANGER
Howard McC‘urdy, Walnut Park, Calif.
Application May 17, 1937, Serial No. 143,088
1 Claim. (Cl. 181—60)
This invention is an apparatus for substan
‘tially changing the length and amplitude of sound
waves.‘
It is an object of the invention to very mate
5 rially reduce or eliminate the objectionable wave
impulses set up by operation of various machines,
especially such as the more powerful pressure
fluid operated motors which almost continuously
discharge exhaust gases under high amplitude to
10 the atmosphere.
.
Particularly, an object is to substantially in
stantly break a sound wave into lesser waves as
to amplitude and length so that the objection
or noise and vibration reactions to the wave will
ll)
be avoided.
Further, an object is to provide a sound wave
changer of utmost simplicity, of low cost relative
to its given installation; of freedom from back
pressure reactions; and which is devoid of
labyrinthic characteristics and therefore will not
choke up.
-
It is understood that the uses of the apparatus
are very numerous and greatly varied, and it is
not here intend-ed that the device is limited in
respect to its utility.
OO
It is an object to provide a sound wave changer
1
which will function to break a sound wave into
any suitable number of lesser waves which will
impact the atmosphere is such a reduced manner
as to be incapable of undesired noise and reaction
vibrations. At the same time it is an object to
provide for such a subdivision of a wave without
the
use
of
very
objectionable,
closed - type
cushioning chambers and merely circuitous pas
5
03 sages offering frictional resistance to the flow of
exhausting gases.
The invention consists of certain advancements
in this art as set forth in the ensuing disclosure
and having, with the above, additional objects
Ill) and advantages as hereinafter developed, and
whose construction, combination and details of
means and the manner of operation will be made
manifest in the description of the annexed illus
trative embodiment; it being understood that
45 modi?cations, variations and adaptations may be
resorted‘ to within the scope, principle and spirit
of the invention as it is more directly claimed in
the appendage.
Figure 1 is an axial, elevational section.
Figure 2 is a cross-section on line 2—2 of Fig. 1.
Figure 3 is a schematic diagram of the stream
?ow and subdivision in the device.
In the adaptation of the Wave changer to an
internal combustion motor the exhaust gases
55 therefrom pass through a conduit 2 which is ?xed
50
concentrically in an end head 3’ of a ?rst stage
chamber or cylinder 3 of a diameter of greater
dimension than that of the conduit 2 at its con
nection with the head 3’ which is the intake of
the chamber 3.
The chamber 3 has a far end wall in the form
of a flat annulus 4 against which is abutted a
second stage chamber or cylinder 5 here shown as
of less diameter than chamber 3 but larger than
the concentric opening 4’ of the wall or partition 10
4 and which is here plainly shown as. materially
smaller than the inlet opening 3" in the intake
head 3’. Thus the wall 4 presents a very con
siderable face area 4e, Fig. 2, across the projected
bore of conduit 2 at the intake opening 3". This
is clearly depicted in Fig. 3.
The far end of the second stage chamber 5 is
provided with an end wall in the. form of a flat
annulus 3 having an axial opening 6’ materially
smaller than the coaxial opening 4’ of wall It so
that it presents a considerable annular face area
61’- concentric, in end view, of the face 4*at of the
wall 4.
The wall 6 is abutted by a third stage cham
ber or cylinder 1 of substantially larger diameter 25
than the opening 6’ of wall 6; chamber 1 having
an imperforate end closure 8. A protective balile
9 is, if desired, ?xed inwardly of the end closure 8.
It is understood that the number of stage cham
bers and their dimensions will be determined in 30
accordance with given wave of sound to be sub
divided.
Each chamber 3, 5 and l is provided with suit
ably disposed exhaust ports H], which, if so de
sired, according to the case, may be provided with
external de?ectors l l of any desired type, having
the supplemental function of further altering the
character of wave force discharging at the ports
it). These ports are preferably so disposed as to
provide for radial expansion of the gases in their
respective stage chambers; particularly the ar
rested fractions of the gas stream stopped by the
interposed barrier face areas 4a, 6a and 9.
The rigidly, coaxially joined chambers 3, 5 and
‘l are preferably enclosed in a considerably larger
collecting drum or shell 12 having an exhaust
pipe l3 leading freely to an atmospheric dis
charge or outlet so that no objectionable back
pressure is set up against gas discharged at the
vent ports ID of the multi-stage wave changer
formed of the several chambers 3, 5 and 1. It is
understood that the gases and propagated sound
waves are not caused by the shell I2 to be con
?ned thereinand passed back to ?ow circuitously
from one chamber to the other but are caused to 55
2
2,113,055
pass directly to atmosphere, unless passed to some
heat exchange apparatus for utilization of the
contained heat.
Cl
Referring now to Fig. 3, it will be seen that a
stream of exhaust gas will pass from the conduit 2
axially into chamber 3 where a peripheral, an
nular fraction of the cylindrical stream will abut
the interposed annular area 4c of the transverse
tions are outwardly, radially expanded in lag
ging time steps and impact the atmosphere in
?rst stage wall 4.
successive, weakened impulses.
The arrested tubular stream
10 S1 will then expand into the larger cylinder 3 at
the space V1 and discharge through the ports Ill
of chamber 3.
At the same instant a concentric tube S2 (or
fraction) of the axially flowing gas stream has
advanced to the stop area B11 of the wall 6 of
second cylinder or chamber 5 and the arrested
stream tube S2 expands; to the annular space V2
in chamber 5 and escapes at ports l0.
Meantime the central stream fraction S3 axially
?ows through hole 6’ of wall 6 and abuts ba?le
9 and radially expands into annular space V‘.
While the ?ow of a single sound wave of the
propagating gas stream from chamber 3 to- cham
bers 5 and 7 may be considered instantaneous
yet the period is actually divided into a plural
ity of lagging time steps. During the time lag of
passage of a wave from chamber 3 to second
chamber 5 a part of a given wave has been in
tercepted by the barrier area 4a and has been
discharged through expansion space V1 to the
low (atmospheric) pressure in shell I2 and thence
to the atmosphere. Immediately following this
the concentric, tubular stream fraction or wave
part S2 is arrested by the wall barrier area 6*‘
and is radially expanded through space V2 to
the shell l2 and to atmosphere. Finally, the core
or center stream fraction S3 is stopped by ba?le
9 and is radially expanded through space V3 and
ports H] to the atmospheric shell l2.
40
gradually-seaping, uninterrupted stream of gas
?ow. On the contrary, there is a positive stop
ping of numerous, contiguous, concentric frac
Thus the full sound wave force is not thrown
onto the atmosphere at one instant but is divided
and discharged as time lagging fractions one
after the other and their sound and vibration
effects greatly choked.
The device has no closed, cushion forming
chambers; no continuous line of ?ow, direct or
circuitous from end to end through which the
wave propagating ?uid must pass, and has no
tions of the wave forming stream by the axially
spaced, concentrically presented barrier areas
4a, 5a and baf?e face 9. The stopped wave por
What is claimed is:
' A sound wave sub-dividing device including an
1O
exhaust shell, and a series of progressively
stepped-down chambers in the shell, one end of
the shell being closed by a head to which the near
end of the largest chamber is abutted concentri
cally of the shell, a gas conduit leading into said
largest chamber through an axial in?ow opening
which is materially smaller than the diameter
of said chamber, a ?rst discal wall closing the
back end of said chamber and having a ?rst con
centric, gas outlet which is materially smaller
than the said in?ow opening and said ?rst wall
constituting a baffle in front of which an annu
lar volume of incoming gas is arrested and is
permitted to unobstructedly expand toward and
for the full length of said largest chamber; a
second expansion chamber whose forward end
concentrically abuts said ?rst wall and is of
materially larger diameter than the outlet in the
?rst wall so as to provide for free direct outward 30
expansion of gas coming through said wall, a sec
ond discal wall closing the back end of the sec
ond chamber and having a second, concentric gas
outlet which is of materially smaller diameter
than the ?rst wall outlet and said second wall -
constituting a ba?ie in front of which the incom
ing gas is arrested except at the second outlet
and is permitted to expand unobstructedly to
ward and for the full length of the second cham
ber; and a third chamber concentrically abutting 40
the second wall and being of materially larger
diameter than the second wall opening and form
ing for its full length an unobstructed expansion
space for the stream of gas incoming from the
second wall opening; all of the said chambers 45
having outlets into the exhaust shell.
HOWARD MCCURDY.
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