DE9101196U1 - Exhaust reflection silencer for model motor aircraft - Google Patents

Exhaust reflection silencer for model motor aircraft

Info

Publication number
DE9101196U1
DE9101196U1 DE9101196U DE9101196U DE9101196U1 DE 9101196 U1 DE9101196 U1 DE 9101196U1 DE 9101196 U DE9101196 U DE 9101196U DE 9101196 U DE9101196 U DE 9101196U DE 9101196 U1 DE9101196 U1 DE 9101196U1
Authority
DE
Germany
Prior art keywords
sound
exhaust
insulating
silencer
model motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
DE9101196U
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wik-Modelle Ing Wilfried Klinger 7134 Knittlingen De GmbH
Original Assignee
Wik-Modelle Ing Wilfried Klinger 7134 Knittlingen De GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wik-Modelle Ing Wilfried Klinger 7134 Knittlingen De GmbH filed Critical Wik-Modelle Ing Wilfried Klinger 7134 Knittlingen De GmbH
Priority to DE9101196U priority Critical patent/DE9101196U1/en
Publication of DE9101196U1 publication Critical patent/DE9101196U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1833—Construction facilitating manufacture, assembly, or disassembly specially adapted for small internal combustion engines, e.g. used in model applications
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/10—Plastic foam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/14—Wire mesh fabric, woven glass cloth or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Description

HANS TRAPPENBERG Patentingenieur - Europäischer PatentvertreterHANS TRAPPENBERG Patent Engineer - European Patent Attorney

30.01.1991 &eegr; WB 010630.01.1991 &eegr; WB 0106

WiK-Modelle, Ing. Wilfried Klinger GmbH Wiesenstraße, 7134 KnittlingenWiK-Modelle, Ing. Wilfried Klinger GmbH Wiesenstraße, 7134 Knittlingen

Abgas-Reflexionsschalldämpfer
für Modell-Motorflugzeuge Exhaust reflection silencer
for model motor aircraft

Die Neuerung betrifft Abgas-Reflexionsschalldämpfer für Modell-Motorflugzeuge, gebildet aus einem rohrförmigen Auspufftopf, in den die Abgase an der einen Stirnseite eingeleitet werden und ihn nach Durchströmen von Resonatoren an der jenseitigen Stirnseite wieder verlassen.The innovation concerns exhaust reflection silencers for model motor aircraft, formed from a tubular muffler into which the exhaust gases are introduced at one end and leave again after flowing through resonators at the other end.

Derartige Abgas-Reflexionsschalldämpfer haben sich gerade beim Einsatz an Modell-Motorflugzeugen sehr bewährt, da die Modellflugzeuge üblicherweise mit etwa gleichbleibender Drehzahl betrieben werden, dieSuch exhaust reflection silencers have proven to be very useful, especially when used on model motor aircraft, since model aircraft are usually operated at a constant speed, which

Schalldämpfer daher hinsichtlich ihrer Resonatoren auf die zu erwartende Frequenz eingestellt werden können. Zu beachten ist allerdings, daß nach wie vor der durch das hochgespannte Abgas bewirkte hörbare Schall aus einem Frequenzgemisch besteht, aus dem zwar die Resonatoren bei einem derartigen Reflexionsschalldämpfer bestimmte, besonders störende Frequenzen sehr gut ausfiltern können, daneben jedoch noch kaum beeinflußte Frequenzen verbleiben. Dies bedeutet, daß zwar ein Großteil der besonders störenden Frequenzen durch derartige Reflexionsschalldämpfer ausgefiltert werden, die nicht gedämpften Frequenzen jedoch nach wie vor einen störenden Schall ergeben.Silencers can therefore be set to the expected frequency in terms of their resonators. However, it should be noted that the audible sound caused by the high-pressure exhaust gas still consists of a mixture of frequencies from which the resonators in such a reflection silencer can filter out certain particularly disturbing frequencies very well, but there are still frequencies that are hardly affected. This means that although a large proportion of the particularly disturbing frequencies are filtered out by such reflection silencers, the frequencies that are not dampened still produce a disturbing sound.

Aufgabe der Neuerung ist es, diesen verbleibenden störenden Schall weitestmöglich zu dämpfen. Erreicht wird dies in neuerungsgemäßer Weise dadurch, daß der Mantel des Auspufftopfes doppelwandig ist und daß in den Zwischenraum zwischen den beiden Wandungen schalldämmendes und schalldämpfendes Material eingefügt ist.The aim of the innovation is to dampen this remaining disturbing noise as much as possible. This is achieved in an innovative way by the fact that the casing of the exhaust silencer is double-walled and that sound-insulating and sound-damping material is inserted into the space between the two walls.

Nicht mehr also wie bei den üblichen Schalldämpfern für Modell-Motorflugzeuge, bei denen ja besonders auf das Gewicht geachtet werden muß, wird der Auspufftopf einwandig ausgeführt, sondern nach der Neuerung doppelwandig, so daß in den Zwischenraum zwischen den beiden Wandungen Material eingefügt werden kann, das durch äußere Reibung zwischen den durch den Schalldruck bewegten Luftteilchen und dem Skelett des porösen beziehungsweise fasrigen Materials Schallenergie in Wärme umgewandelt wird, so daß die vom Schalldämpfer abgestrahlte Schallenergie deutlich vermindert wird. Hierbei kann das schalldämmende und schalldämpfende Material, bevorzugt Glaswolle oder geschlossenporiger Schaumstoff, in Form einer Dämmatte zwischen die Wandungen einzuschieben sein.Unlike the usual silencers for model motor aircraft, where particular attention must be paid to weight, the exhaust muffler is no longer single-walled, but is now double-walled, so that material can be inserted into the space between the two walls, which converts sound energy into heat through external friction between the air particles moved by the sound pressure and the skeleton of the porous or fibrous material, so that the sound energy emitted by the silencer is significantly reduced. The sound-insulating and sound-damping material, preferably glass wool or closed-cell foam, can be inserted between the walls in the form of an insulating mat.

Auf der Zeichnung ist ein Ausführungsbeispiel eines derartigen Abgas-Reflexionsschalldämpfers schematisch dargestellt. In einen Auspufftopf (1), der einseitig mit einem Einlaßstutzen (2) versehen ist, werden die Abgase des Motors eines Modell-Motorflugzeuges eingeleitet. Nach Durchströmen von Resonatoren (3, 4) verlassen sie den Auspufftopf (1) über einen Auspuff (5). Der Mantel des Auspufftopfes (1) ist doppelwandig ausgeführt, so daß in den Zwischenraum zwischen den beiden Wandungen schalldämmendes und schalldämpfendes Material (6) eingefügt werden kann. Dadurch wird nicht nur der von der Außenhaut des Schalldämpfers abgehende Schall vermindert, sondern auch Schallenergie in Wärme umgewandelt, so daß insgesamt eine verminderte Schallabgabe erfolgt.The drawing shows a schematic example of such an exhaust reflection silencer. The exhaust gases from the engine of a model aircraft are fed into an exhaust silencer (1) which is provided with an inlet nozzle (2) on one side. After flowing through resonators (3, 4) they leave the exhaust silencer (1) via an exhaust (5). The casing of the exhaust silencer (1) is double-walled so that sound-insulating and sound-damping material (6) can be inserted into the space between the two walls. This not only reduces the sound emitted by the outer skin of the silencer, but also converts sound energy into heat, so that overall the sound emission is reduced.

Claims (4)

HANS TRAPPENBERG Patentingenieur - Europäischer Patentvertreter 30.01.1991 &eegr; WB 0106 WiK-Modelle, Ing. Wilfried Klinger GmbH Wiesenstraße, 7134 Knittlingen Abgas-Reflexionsschalldämpfer für Modell-Motorfluazeuae SCHUTZANSPRÜCHEHANS TRAPPENBERG Patent engineer - European patent representative 30.01.1991 &eegr; WB 0106 WiK-Modelle, Ing. Wilfried Klinger GmbH Wiesenstraße, 7134 Knittlingen Exhaust reflection silencer for model motor aircraft PROTECTION CLAIMS 1. Abgas-Reflexionsschalldämpfer für Modell-Motorflugzeuge, gebildet aus einem rohrförmigen Auspufftopf, in den die Abgase an der einen Stirnseite eingeleitet werden und ihn nach Durchströmen von Resonatoren an der jenseitigen Stirnseite wieder verlassen,1. Exhaust reflection silencer for model motor aircraft, formed from a tubular muffler, into which the exhaust gases are introduced at one end and leave it again after flowing through resonators at the other end, dadurch gekennzeichnet, daß der Mantel des Auspufftopfes (1) doppelwandig ist und daß in den Zwischenraum zwischen den beiden Wandungen schalldämmendes und schalldämpfendes Material (6) eingefügt ist.characterized in that the casing of the exhaust silencer (1) is double-walled and that sound-insulating and sound-damping material (6) is inserted into the space between the two walls. 2. Abgas-Reflexionsschalldämpfer nach Anspruch 1, dadurch gekennzeichnet, daß das schalldämmende und schalldämpfende Material (6) Glaswolle ist.2. Exhaust reflection silencer according to claim 1, characterized in that the sound-insulating and sound-damping material (6) is glass wool. 3. Abgas-Reflexionsschalldämpfer nach Anspruch 1, dadurch gekennzeichnet, daß das scha11dämmende und schalldämpfende Material (6) geschlossenporiger Schaumstoff ist.3. Exhaust reflection silencer according to claim 1, characterized in that the sound-insulating and sound-damping material (6) is closed-cell foam. 4. Abgas-Reflexionsschalldämpfer nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das scha11dämmende und schalldämpfende Material (6) eine Dämmatte ist.4. Exhaust reflection silencer according to one or more of the preceding claims, characterized in that the sound-insulating and sound-damping material (6) is an insulating mat.
DE9101196U 1991-02-02 1991-02-02 Exhaust reflection silencer for model motor aircraft Expired - Lifetime DE9101196U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9101196U DE9101196U1 (en) 1991-02-02 1991-02-02 Exhaust reflection silencer for model motor aircraft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE9101196U DE9101196U1 (en) 1991-02-02 1991-02-02 Exhaust reflection silencer for model motor aircraft

Publications (1)

Publication Number Publication Date
DE9101196U1 true DE9101196U1 (en) 1991-04-25

Family

ID=6863931

Family Applications (1)

Application Number Title Priority Date Filing Date
DE9101196U Expired - Lifetime DE9101196U1 (en) 1991-02-02 1991-02-02 Exhaust reflection silencer for model motor aircraft

Country Status (1)

Country Link
DE (1) DE9101196U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008021201A1 (en) 2008-04-28 2009-11-05 H. Butting Gmbh & Co. Kg Delivery pipeline system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008021201A1 (en) 2008-04-28 2009-11-05 H. Butting Gmbh & Co. Kg Delivery pipeline system

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