US1721385A - Exhaust silencer - Google Patents

Exhaust silencer Download PDF

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Publication number
US1721385A
US1721385A US269819A US26981928A US1721385A US 1721385 A US1721385 A US 1721385A US 269819 A US269819 A US 269819A US 26981928 A US26981928 A US 26981928A US 1721385 A US1721385 A US 1721385A
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Prior art keywords
balls
exhaust
silencer
gases
exhaust silencer
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Expired - Lifetime
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US269819A
Inventor
Furnivall William Henry Graham
Mclaren David Bertha
Laschinger Edgar Jacob
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Individual
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Individual
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/08Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/081Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling by passing the gases through a mass of particles

Definitions

  • the present invention refers to exhaust silencers of the kind comprising a container partially filled with a loose mass of balls. At the base of the container is a perforated partition, through which the exhaust gases are conducted into the container; and the balls are of such size that they are lifted and agitated by the gases. Thereby they deprive the gases of their noise producing energy or so modify such energy as to reduce the noise;
  • the purpose of the invention is to provide a silencer of this kind which minimizes back pressure in the engine.
  • Fig. I is a longitudinal vertical section of a silencer and Fig. II is a plan.
  • the ball container comprises a member 2 with vertical walls, a perforated base plate 3 clamped between the members 2 and 4, and a Wire mesh screen 5 similarly clamped between members 2 and 6.
  • a loose mass of balls 7 partially fills the ball container; and, when dormant, rests on the base plate 3.
  • the member 2 is considerably elongated on one horizontal axis a which in practice is the axis lying fore-and-aft of a motor vehicle on which the silencer is fitted.
  • the hollow inlet member 4 is split at 8 and provided with bolt lugs 9 for clamping it to the end of a horizontal exhaust pipe. It extends parallel with the axis a and is curved to deliver the exhaust gases upwardly to the ball container.
  • the hollow outlet member 6 is bolted to the upper end of the ball container and conducts the gases to the rearwardly directed and flattened orifice 10 of a fish tail 11, extending in the general direction of the axis a but oppositely to the member 4.
  • the wire screen 5 has the usual rectangular mesh preferably with oblong openings, so that 269,819, and in Germany August 26, 1926.
  • Balls of inch in diameter have been found suitable for a motor car exhaust silencer. Wit-h balls of this size the provision of holes of inch diameter and spaced inch apart enables all or practically all the holes to be occupied by the lowermost layer of a mass of balls settling by gravity.
  • the successive opening of the engine exhaust valves tends to cause the gases to pass through the exhaust system in a series of waves of pressure alternating with waves of rarefaction.
  • the point at which the gases are discharged from the silencer into the atmosphere acts as a mode from which such waves are reflected back into the exhaust system, so interfering with on-coming waves and raising the back pressure in the system.
  • the effect of the construction described is that the balls are raised and agitated by a wave of pressure and thereby diminish its noise-making capacity.
  • the balls settle back onto the plate 3, enter the holes 12 or a substantial number of said holes and act as non-return valves to prevent the ases or the atmospheric air from flowing ack into the exhaust pipe.
  • An exhaust silencer comprising two elbowshaped members, the one an exhaust member, having a cylindrical end adapted to be clamped to an exhaust pipe and having an upwardly directed end of oval cross section and having a downwardly directed oval shaped end of similar area and cross section to the corresponding end of the inlet member, an intermediate drum of oval cross section secured between the oval ends of the inlet and outlet members, upper and lower screens for said drum clam'fizd between said round perforations of ball retaining width.
  • the upper screen being provided with non- V EDGAR JACOB LASCHINGER.

Description

Patented July 16, 1929- WILLIAM HENRY GRAHAM FUItNIVALL,
nAvInjBE RTHA MCLAREN; ND D AR .moon LASCHINGERj'QF'JOHANNESBURG, rnANs'vAAL, sourrr AFRICA;
EXHAUST sinnivcnn.
Application filed April 13, 1928, Serial No.
The present invention refers to exhaust silencers of the kind comprising a container partially filled with a loose mass of balls. At the base of the container is a perforated partition, through which the exhaust gases are conducted into the container; and the balls are of such size that they are lifted and agitated by the gases. Thereby they deprive the gases of their noise producing energy or so modify such energy as to reduce the noise;
whilst the agitation of the balls prevents accumulation of carbon and other solid deposits in the silencer.
The purpose of the invention is to provide a silencer of this kind which minimizes back pressure in the engine.
The invention is illustrated in the accompanying drawing in which Fig. I is a longitudinal vertical section of a silencer and Fig. II is a plan.
The ball container comprises a member 2 with vertical walls, a perforated base plate 3 clamped between the members 2 and 4, and a Wire mesh screen 5 similarly clamped between members 2 and 6. A loose mass of balls 7 partially fills the ball container; and, when dormant, rests on the base plate 3. The member 2 is considerably elongated on one horizontal axis a which in practice is the axis lying fore-and-aft of a motor vehicle on which the silencer is fitted.
The hollow inlet member 4 is split at 8 and provided with bolt lugs 9 for clamping it to the end of a horizontal exhaust pipe. It extends parallel with the axis a and is curved to deliver the exhaust gases upwardly to the ball container.
The hollow outlet member 6 is bolted to the upper end of the ball container and conducts the gases to the rearwardly directed and flattened orifice 10 of a fish tail 11, extending in the general direction of the axis a but oppositely to the member 4.
45 It will be seen that the exhaust gases flow first horizontally, then upwardly and then again horizontally, but the elongation of the ball chamber in the direction of their horizontal flow enables thechanges of direction to be made in easy curves; this being a factor in minimizing the back pressure.
The wire screen 5 has the usual rectangular mesh preferably with oblong openings, so that 269,819, and in Germany August 26, 1926.
and their diameter and distance are'so proportioned to the diameter of the balls that it is possible for the balls to settleinto all or substantially all of the holes. Balls of inch in diameter have been found suitable for a motor car exhaust silencer. Wit-h balls of this size the provision of holes of inch diameter and spaced inch apart enables all or practically all the holes to be occupied by the lowermost layer of a mass of balls settling by gravity.
The successive opening of the engine exhaust valves tends to cause the gases to pass through the exhaust system in a series of waves of pressure alternating with waves of rarefaction. The point at which the gases are discharged from the silencer into the atmosphere acts as a mode from which such waves are reflected back into the exhaust system, so interfering with on-coming waves and raising the back pressure in the system.
The effect of the construction described is that the balls are raised and agitated by a wave of pressure and thereby diminish its noise-making capacity. When the succeeding wave 0 rarefaction arrives, the balls settle back onto the plate 3, enter the holes 12 or a substantial number of said holes and act as non-return valves to prevent the ases or the atmospheric air from flowing ack into the exhaust pipe.
We'cIaim: v
An exhaust silencer comprising two elbowshaped members, the one an exhaust member, having a cylindrical end adapted to be clamped to an exhaust pipe and having an upwardly directed end of oval cross section and having a downwardly directed oval shaped end of similar area and cross section to the corresponding end of the inlet member, an intermediate drum of oval cross section secured between the oval ends of the inlet and outlet members, upper and lower screens for said drum clam'fizd between said round perforations of ball retaining width.
drumlmd the'hdhoent mem' rs, balls in said In testimony whereof we have signed our drum "between said screens, the lower screen names to this specification. 1 being formed with perforations of such size 5 .aei as :to substantially all 06- I I wkmyiulclude kgy 7 balls, when in state ofo repose,
the upper screen being provided with non- V EDGAR JACOB LASCHINGER.
US269819A 1926-08-26 1928-04-13 Exhaust silencer Expired - Lifetime US1721385A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1721385X 1926-08-26

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US1721385A true US1721385A (en) 1929-07-16

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4247213A (en) * 1974-08-03 1981-01-27 U.S. Philips Corporation Platen for printing devices
US4896588A (en) * 1988-01-26 1990-01-30 The Boeing Company Self-cleaning cabin airflow regulating device
US5009579A (en) * 1988-08-15 1991-04-23 Grant Airmass Corporation Fluid pump encasement
US20060102420A1 (en) * 2004-11-13 2006-05-18 Andreas Stihl Ag & Co. Kg Muffler for exhaust gas
US7472774B1 (en) * 2006-01-27 2009-01-06 Lockheed Martin Corporation Versatile engine muffling system
US20110005860A1 (en) * 2009-07-13 2011-01-13 Kwin Abram Exhaust component with reduced pack

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4247213A (en) * 1974-08-03 1981-01-27 U.S. Philips Corporation Platen for printing devices
US4896588A (en) * 1988-01-26 1990-01-30 The Boeing Company Self-cleaning cabin airflow regulating device
US5009579A (en) * 1988-08-15 1991-04-23 Grant Airmass Corporation Fluid pump encasement
US20060102420A1 (en) * 2004-11-13 2006-05-18 Andreas Stihl Ag & Co. Kg Muffler for exhaust gas
US7472774B1 (en) * 2006-01-27 2009-01-06 Lockheed Martin Corporation Versatile engine muffling system
US20110005860A1 (en) * 2009-07-13 2011-01-13 Kwin Abram Exhaust component with reduced pack

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