DE727961C - Silencer, especially for internal combustion engines, in which the sound is directed into several chambers at the same time - Google Patents
Silencer, especially for internal combustion engines, in which the sound is directed into several chambers at the same timeInfo
- Publication number
- DE727961C DE727961C DEE54943D DEE0054943D DE727961C DE 727961 C DE727961 C DE 727961C DE E54943 D DEE54943 D DE E54943D DE E0054943 D DEE0054943 D DE E0054943D DE 727961 C DE727961 C DE 727961C
- Authority
- DE
- Germany
- Prior art keywords
- silencer
- cross
- sound
- pipe
- internal combustion
- 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
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
- 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
- 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
Schalldämpfer; insbesondere für Brennkraftmaschinen, bei dem der Schall gleichzeitig in mehrere Kammern geleitet wird Bei den für Brennkraftmaschinen üblichen Schalldämpfern wird im allgemeinen der Schall und die Strömung von einer zur anderen Kammer geleitet. Es ist auch bekannt, den Schall gleichzeitig in mehrere Kammern zu leiten.Silencer; especially for internal combustion engines, where the sound is conducted simultaneously into several chambers in the usual for internal combustion engines Mufflers generally handle the sound and flow from one to the other Chamber headed. It is also known to pass the sound into several chambers at the same time to direct.
hach 'dem Vorschlag der Erfindung wird nun die Abstimmung bei einem Schalldämpfer, bei dem der Schall gleichzeitig in mehrere Kammern geleitet wird, dermaßen vorgenommen, daß in den einzelnen Verzweigungen Widerstandsgleichheit erreicht wird. Durch folgende zwei Bedingungen wird dies erreicht: i. Das die erste und letzte Kammer verbindende Rohr h (Querschnitt F1) besitzt denselben Strömungswiderstand wie die zwei hintereinanderliegenden Rohre 1" 1, (Querschnitt F2) und wie die drei hintereinanderliegenden Rohre h, L" 19 (Querschnitt F3) usw., so daß sich also die Querschnitte der Rohre wie die Wurzeln aus den aufeinanderfolgenden Zahlen verhalten a. Die Grenzfrequenzen für jeden der aufeinanderfolgenden Resonatoren sind einander gleich, so daß also die erste Kammer mit dem Inhalt V, mit den Leitwerten der Rohre 1" 1" L" 1, gleich ist der Grenzfrequenz der zweiten Kammer mit dem Inhalt V2 mit dem Leitwert des Rohres 1" gleich ist der Grenzfrequenz der dritten Kammer mit dem Inhalt V3 mit den Leitwerten der Rohre h, Z, usw.According to the proposal of the invention, the tuning in a muffler in which the sound is conducted simultaneously into several chambers is now carried out in such a way that equal resistance is achieved in the individual branches. This is achieved by the following two conditions: i. The pipe h connecting the first and last chamber (cross section F1) has the same flow resistance as the two consecutive pipes 1 " 1, (cross section F2) and like the three consecutive pipes h, L" 19 (cross section F3) etc., so that so the cross-sections of the pipes behave like the roots from the successive numbers a. The cut-off frequencies for each of the successive resonators are the same, so that the first chamber with the content V, with the conductance of the tubes 1 "1" L " 1, is the same as the cut-off frequency of the second chamber with the content V2 with the conductance of the Pipe 1 "is equal to the cut-off frequency of the third chamber with the content V3 with the conductance values of the pipes h, Z , etc.
In der beigeschlossenen Zeichnung sind zwei Beispiele für Schalldämpferausführungen nach dem Vorschlag der Erfindung dargestellt.In the accompanying drawing are two examples of silencer designs shown according to the proposal of the invention.
Es sei ein Schalldämpfer mit fünf Kammern (Ttl bis V5) angenommen. T, ist mit I# durch ein Rohr 1i verbunden. Die zweite Verbindung geht von V, nach V4 (Rohr Z.), von L 4 nach V5 (Rohr Z$). Die nächste Reihe der Verbindungen läuft von V1 nach V@ (Rohr l3), von V3 nach V4 (Rohr Z6), von V4. nach VS (Rohr 1a).Assume a silencer with five chambers (Ttl to V5). T, is connected to I # by a pipe 1i. The second link goes from V to V4 (pipe Z.), from L 4 to V5 (pipe Z $). The next row of Connections run from V1 to V @ (pipe l3), from V3 to V4 (pipe Z6), from V4. after VS (pipe 1a).
Die letzte Reihe der Rohre ist dann eine Verbindung von Kammer zu Kammer 1i nach h@ (Rohr L4), Tl# nach V3 (Rohr l,,), Tos nach b'4 (Rohr Z,), Tl4 nach V5 (Rohr 1i0).The last row of pipes is then a connection from chamber to Chamber 1i to h @ (pipe L4), Tl # to V3 (pipe 1,), Tos to b'4 (pipe Z,), Tl4 according to V5 (pipe 1i0).
Der Gaseintritt erfolgt von links durch das Rohr in, der Austritt durch die Leitung ia. Dieser Schalldämpfer soll nun der Bedingung entsprechen, daß in den einzelnen Verzweigungen Widerstandsgleichheit erreicht wird. Die ganz allgemeine Strömungsgleichung lautet In dieser Formel bedeutet p den Druck, o die Luftdichte, A= die durchströmende Gasmenge in der Zeiteinheit. F= den durchströmten Querschnitt.The gas enters from the left through the pipe in, the exit through the line ia. This silencer should now meet the condition that equal resistance is achieved in the individual branches. The very general flow equation reads In this formula, p denotes the pressure, o the air density, A = the amount of gas flowing through in the unit of time. F = the cross-section through which the air flows.
Für widerstandsgleiche Verzweigung wird verlangt, daß A für jede Verzweigung konstant ist. klimmt man nun einen Schalldämpfer mit drei Kammern und zwei parallelen Verzweigungen (s. Abb. 3) an, so ergibt sich Um nun einen Schalldämpfer nach dem Vorschlag der Erfindung zu bauen, muß in den einzelnen Verzweigungen Widerstandsgleichheit erreicht werden. Demgemäß müssen die O_uerschnitte der die Kammern verbindenden Rohre sich so verhalten wie die Wurzeln aus den aufeinanderfolgenden Zahlen, und gleichzeitig müssen die Grenzfrequenzen der aufeinanderfolgenden Resonatoren einander gleich sein. Es ergibt sich also die Bedingung, daß F1 : F. : F3 : F,. .. = z : l'2 : j` 3 : y' 4 ... Diese Gleichung trägt der rein strömungsmäßigen Bedingung Rechnung. Dazu kommt nun als zweite Bedingung für die widerstandsgleiche Verzweigung die akustische. Da nun nach der bekannten Theorie der Kettenleiter die Grenzfrequenz für jeden Resonator gleich sein soll, kommt man zu folgender Gleichung: Eine andere Möglichkeit ist in Abb. 2 dargestellt, bei der eine Anzahl Rohre so verlegt ist, daß für den Hauptfluß ein soggenannter glatter Durchgang erzielt wird, während seitlich Verzweigungen vorgesehen sind. Der Eintritt der Abgase in den Schalldämpfer erfolgt durch das Rohr o, der Austritt durch das Rohr p. Die Kammergrößen sind W1 bis W.. Die Verbindung zu der einzelnen Kammer liegt nun so, daß W1 mit b1'= durch Si, W. mit W3 durch s3 verbunden sind. Die weiteren Verbindungen sind: W1 mit Ws durch s., W3 mit W4 durch s4, f'4 mit W5 durch s, Die Bedingungsgleichungen lauten alsdann: Für den Fall der Abb. 3 muß von der allgemeinen akustischen Bedingung davon ausgegangen werden, daß dann gleiche Eigenschwingung herrscht, wenn yFj = const.For branching with equal resistance it is required that A is constant for each branch. If one climbs on a silencer with three chambers and two parallel branches (see Fig. 3), the result is In order to build a muffler according to the proposal of the invention, equal resistance must be achieved in the individual branches. Accordingly, the cross sections of the tubes connecting the chambers must behave like the roots of the successive numbers, and at the same time the cut-off frequencies of the successive resonators must be equal to one another. The condition thus arises that F1: F.: F3: F ,. .. = z: l'2: j` 3: y '4 ... This equation takes into account the purely flow-related condition. In addition, the second condition for branching with the same resistance is the acoustic one. Since, according to the well-known chain ladder theory, the cut-off frequency should be the same for every resonator, the following equation is obtained: Another possibility is shown in Fig. 2, in which a number of pipes are laid in such a way that a so-called smooth passage is achieved for the main flow, while lateral branches are provided. The exhaust gases enter the muffler through pipe o, and exit through pipe p. The chamber sizes are W1 to W .. The connection to the individual chambers is now such that W1 with b1 '= through Si, W. with W3 through s3. The other connections are: W1 with Ws through s., W3 with W4 through s4, f'4 with W5 through s, The conditional equations then read: In the case of Fig. 3, it must be assumed from the general acoustic condition that the same natural oscillation then prevails when yFj = const.
Daraus ergibt sich dann die Gleichung In diesen Gleichungen bedeutet F den Querschnitt, L die Rohrlänge und TI die Kammergröße des Resonators. Es gibt natürlich noch alle möglichen anderen Formen und Aufeinanderfolgen von Schalldämpfern nach der Lehre der Erfindung; die in Abb. r und 2 dargestellten sind nur zwei beliebige Beispiele.This then gives the equation In these equations, F is the cross section, L is the tube length and TI is the chamber size of the resonator. There are of course all sorts of other forms and sequences of silencers according to the teaching of the invention; those shown in Fig. r and 2 are just two arbitrary examples.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEE54943D DE727961C (en) | 1941-06-04 | 1941-06-04 | Silencer, especially for internal combustion engines, in which the sound is directed into several chambers at the same time |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEE54943D DE727961C (en) | 1941-06-04 | 1941-06-04 | Silencer, especially for internal combustion engines, in which the sound is directed into several chambers at the same time |
Publications (1)
Publication Number | Publication Date |
---|---|
DE727961C true DE727961C (en) | 1942-11-16 |
Family
ID=7082002
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEE54943D Expired DE727961C (en) | 1941-06-04 | 1941-06-04 | Silencer, especially for internal combustion engines, in which the sound is directed into several chambers at the same time |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE727961C (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE917038C (en) * | 1951-06-02 | 1954-08-23 | Eberspaecher J | Silencer, especially for internal combustion engines, with an internal channel |
US2993559A (en) * | 1958-05-19 | 1961-07-25 | Wilhelm S Everett | Fluid surge alleviator |
DE975929C (en) * | 1953-07-05 | 1962-12-13 | Maschf Augsburg Nuernberg Ag | Silencers, especially for internal combustion engines |
DE1242940B (en) * | 1964-08-18 | 1967-06-22 | Eberspaecher J | Rohrfoermiger muffler, especially exhaust muffler for internal combustion engines |
WO2017076377A1 (en) * | 2015-11-05 | 2017-05-11 | MACHOVÁ, Zdeňka | Combined exhaust gas silencer |
-
1941
- 1941-06-04 DE DEE54943D patent/DE727961C/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE917038C (en) * | 1951-06-02 | 1954-08-23 | Eberspaecher J | Silencer, especially for internal combustion engines, with an internal channel |
DE975929C (en) * | 1953-07-05 | 1962-12-13 | Maschf Augsburg Nuernberg Ag | Silencers, especially for internal combustion engines |
US2993559A (en) * | 1958-05-19 | 1961-07-25 | Wilhelm S Everett | Fluid surge alleviator |
DE1242940B (en) * | 1964-08-18 | 1967-06-22 | Eberspaecher J | Rohrfoermiger muffler, especially exhaust muffler for internal combustion engines |
WO2017076377A1 (en) * | 2015-11-05 | 2017-05-11 | MACHOVÁ, Zdeňka | Combined exhaust gas silencer |
CN108291466A (en) * | 2015-11-05 | 2018-07-17 | Z·马乔瓦 | Combined exhaust air muffler |
CZ307848B6 (en) * | 2015-11-05 | 2019-06-26 | Zdeněk MACH | Combined exhaust gases silencer |
EA036759B1 (en) * | 2015-11-05 | 2020-12-17 | Зденек Мах | Combined exhaust gas silencer |
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