EP0730122B1 - Gasbrenner mit verbesserter akustischer Dämpfung - Google Patents

Gasbrenner mit verbesserter akustischer Dämpfung Download PDF

Info

Publication number
EP0730122B1
EP0730122B1 EP96400420A EP96400420A EP0730122B1 EP 0730122 B1 EP0730122 B1 EP 0730122B1 EP 96400420 A EP96400420 A EP 96400420A EP 96400420 A EP96400420 A EP 96400420A EP 0730122 B1 EP0730122 B1 EP 0730122B1
Authority
EP
European Patent Office
Prior art keywords
tube
burner
length
venturi tube
inlet opening
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
EP96400420A
Other languages
English (en)
French (fr)
Other versions
EP0730122A1 (de
Inventor
Peter Wagstaff
Christian Chassaignon
Gwenaelle Schubert
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.)
Chaffoteaux et Maury SAS
Original Assignee
Chaffoteaux et Maury SAS
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 Chaffoteaux et Maury SAS filed Critical Chaffoteaux et Maury SAS
Publication of EP0730122A1 publication Critical patent/EP0730122A1/de
Application granted granted Critical
Publication of EP0730122B1 publication Critical patent/EP0730122B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/10—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head
    • F23D14/105—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head with injector axis parallel to the burner head axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2210/00—Noise abatement

Definitions

  • the present invention relates to burners with gases with improved acoustic discretion as described in the preamble of claim 1.
  • DE-A-22 63 471 describes an example of a like a gas burner.
  • the present invention aims to provide a burner with gas of the kind in question which does not have an entry forced air, but a venturi tube fitted with a gas and which is especially effective in mitigating noise generated by the operation of the gas injector and the venturi tube.
  • a gas burner of the genre in question is essentially characterized in that the interior volume includes a venturi tube having a upstream end which is provided with a gas injector combustible and which is shaped to draw air under the effect of fuel gas injection thereby generating the aforementioned noises, the space entrance opening anti-noise hollow communicating with the venturi tube and being disposed at a distance from the upstream end of the tube venturi which is between 0.2 k ⁇ and 0.3 k ⁇ , where k is an odd integer and where ⁇ is the wavelength predetermined.
  • reference 1 designates an atmospheric burner gas which is intended to be integrated in a boiler, in a water heater, in a bath heater or the like.
  • This burner 1 comprises a venturi tube 2 which extends between an inlet end 3 communicating with the atmosphere and an outlet end 4 communicating with a premix chamber 5, upstream of a combustion grate 6 or any other combustion head.
  • the bedroom premix 5 is delimited by a solid side wall, in general metallic and it communicates only with the venturi tube 2 and with combustion grate 6.
  • the venturi tube 2 conventionally comprises, from upstream to downstream, a short converging section, a pass, then a long divergent section, and it is provided at its inlet end 3 of a fuel gas injector 7.
  • the burner 1 has a single venturi tube 2, but it could have possibly several venturis tubes opening into the same premix chamber, without departing from the scope of the present invention.
  • the tube venturi 2 opens into the premix chamber 5 through the bottom 5a of this chamber, at a longitudinal end 5b of said chamber, and the venturi tube 2 is folded under the bottom 5a substantially parallel to the grid of combustion 6, towards the second longitudinal end 5b of the premix chamber.
  • venturi tube 2 could however be arranged differently from the premix chamber 5, and in particular, it could be arranged under the bottom 5a of the premix chamber substantially perpendicular to the combustion grate 6.
  • the noise barriers are generated by means of two resonant cavities in the form of tubes 10, called "quarter-wave" tubes. These tubes have a section of any shape and each extend longitudinally between on the one hand an open end 11 communicating with the inside of the venturi tube 2, and on the other hand a closed bottom 12.
  • the acoustic vibrations which take place inside the venturi tube 2 penetrate into each of the two tubes 10 through their open end 11, and these vibrations travel the longitudinal length, respectively l 1, l 2 of these tubes before being reflected on their bottom 12, then they again travel the longitudinal length of said tubes in the opposite direction before returning to the venturi tube 2.
  • the two tubes 10 generate counter-noises in phase opposition with the noises generated in the venturi tube 2 in the vicinity of two predetermined frequencies corresponding to wavelengths ⁇ 1 and ⁇ 2 such that the lengths l 1 and l 2 tubes are respectively substantially equal to a quarter of the wavelengths ⁇ 1 and ⁇ 2, or more generally equal to odd integer multiples of a quarter of the wavelengths ⁇ 1 and ⁇ 2.
  • the inlet ends 11 of the tubes 10 are arranged to communicate with an area of the internal volume of the burner where the acoustic vibrations having the frequency to be absorbed have an amplitude maximum.
  • the inlet ends 11 of the tubes 10 are preferably arranged at respective distances l 3, l 4 from the inlet end 3 of the venturi tube which are respectively substantially equal to odd integer multiples of a quarter of the lengths of waves ⁇ 1 and ⁇ 2 of the noises which are respectively muffled by the two tubes 10.
  • the distance l 3 can be between 0.2 k1 ⁇ 1 and 0.3 k1 ⁇ 1, and the distance l 4 can be between 0.2 k2 ⁇ 2 and 0.3 k2 ⁇ 2, where k1 and k2 are odd whole numbers, preferably equal to 1 or 3.
  • the distances between the input end 3 of the venturi tube and the inlets 11 of the tubes are curvilinear distances corresponding to the average path followed by the gases from the inlet end 3 of the tube venturi to the entry openings in question.
  • FIG. 2 shows a spectrum of acoustic vibrations measured in an exemplary embodiment particular of the burner 1 represented in FIG. 1, on the one hand without the two tubes 10 (in solid lines), and on the other hand with the two tubes 10 (dotted lines).
  • burner 1 could be provided of a single tube 10 or possibly of more than two tubes 10, depending on the desired noise frequencies absorb.
  • the tubes 10 could possibly communicate with the premix chamber 5 rather than with the venturi tube 2, they could if necessary present a straight rather than curvilinear shape such as that shown in Figure 1 and they might possibly not be arranged in the plane of symmetry of burner 1.
  • the tubes 10 are arranged with their longitudinal axes in the plane of symmetry of the burner 1, as shown in FIG. 1, insofar as this provision makes it possible to carry out simply burner 1 by stamping then assembly of two metal half-shells, one of these half-shells being shown schematically in Figure 1. Each half-shell then represents half of the venturi tube 2, of the side wall of the premix chamber 5, and of each tube 10.
  • the grid of combustion 6 will usually be reported above the premix chamber 5 after assembly of the two half-shells.
  • the tubes 10 could be replaced by one or more cavities resonant 20 having another form.
  • the resonant cavity 20 is in the form of a volume capacity V, called "Helmholtz resonator" designed to produce inside of the burner 1 against noise in phase opposition with noises presenting the frequency to be attenuated.
  • the resonant cavity 20 communicates with the interior of the venturi tube 2 or the premix chamber 5 via an entrance 21 and it is delimited by a wall waterproof 22.
  • the resonant cavity 20 can communicate with the venturi tube 2 or with the premix chamber 5, and one or more can be provided several resonant cavities depending on the number of frequencies to be attenuated.
  • the inlet 21 of the cavity 20 is preferably arranged in an area where the amplitude of the acoustic vibrations is maximum in the burner, for example at a distance l 5 from the upstream end 3 of the venturi tube which is between 0.2 and 0.3 times an odd integer multiple k of the wavelength ⁇ of the noise to be attenuated, k preferably being equal to 1 or 3.
  • the distance l 5 is preferably close to ⁇ / 4 or more generally close to an odd integer multiple k of ⁇ / 4, k being preferably equal to 1 or 3.
  • the resonant cavity 20 is preferably, but not exclusively, symmetrically arranged with respect to the plane of symmetry of the burner 1, so that the entire burner 1, except where applicable the grate combustion 6, can be achieved by stamping two metal half-shells assembled according to the plane of symmetry, as explained above with reference to FIG. 1.
  • the counter-noises are generated by means of a tube of link 30, of any section, which extends between a share an upstream end 31 or communicating entrance opening with the venturi tube 2, and on the other hand an end downstream 32 communicating with the venturi tube or the premix 5.
  • the ends of the tube 30 can optionally both communicate with the premix chamber 5.
  • the gas mixture which passes through the burner 1 without passing through the connection tube 30 travels a distance L in the venturi tube and the premix chamber 5 between the ends 31 and 32 of the tube of connection, and the connection tube has a length, respectively l 6, l 7, which is either less than or greater than the distance L and which differs from the distance L by a length n ⁇ / 2, where n is a number odd integer and where ⁇ is the wavelength of the noises to be suppressed.
  • n will most often be equal to 1.
  • the length l 6 of the connecting tube 30 is half a wavelength shorter than the length L, and in the example of FIG. 5, the length l 7 of the tube link 30 is half a wavelength longer than length L.
  • the connecting tube 30 Due to its length, the connecting tube 30 generates in any case at its end 32 a noise counter phase opposition with the acoustic vibrations of the gas mixture for the predetermined frequency to be damped.
  • the tube 30 is preferably, but not exclusively, arranged in the plane of symmetry of burner 1, so that this burner, except the if necessary its combustion grate 6, can be produced by stamping two metal half-shells then assembly of these two half-shells along the plane of symmetry.
  • the distance l 8 between the end 31 of the connection tube and the upstream end 3 of the venturi tube can be between 0.2 k ⁇ and 0.3 k ⁇ , this distance being advantageously close to k ⁇ / 4
  • the distance l 9 between the second end 32 of the connecting tube and the upstream end 3 of the venturi tube can be between 0.2 q ⁇ and 0.3 q ⁇ and advantageously close to q ⁇ / 4, where k and q are two different odd integers and where ⁇ is the wavelength of the noise to be attenuated (k is preferably equal to 1 or 3).
  • the counter-noises are generated by means of a resonant cavity annular 35 formed at the upstream end 3 of the tube venturi.
  • annular resonant cavity is delimited radially outwards by an annular wall outer 33 full which laterally delimits the tube venturi 2, and radially inward by a wall full annular 34 having successively a section converge, a pass, then a divergent section,
  • the wall 34 is in sealed peripheral contact with of the outer wall 33 upstream (the upstream ends of these two walls are not necessarily confused), and it extends downstream inside the outer wall 33 to an open end 34a which communicates with the inside of the wall 33.
  • annular resonant cavity 35 extends along the longitudinal axis of the venturi tube 2 between a upstream end 35a closed and a downstream end 35b which forms an annular opening constituting the entrance to the resonant cavity.
  • upstream and downstream ends are separated from each other by an axial distance l 10 substantially equal to a quarter of the wavelength of the noise to be suppressed, or more generally substantially equal to an odd multiple of a quarter. of this wavelength (preferably ⁇ / 4 or 3 ⁇ / 4), the distance between the inlet end 3 of the venturi tube and the inlet opening 35b of the resonant cavity being between 0.2 k ⁇ and 0.3 k ⁇ where k is an odd integer (preferably 1 or 3) and ⁇ is the wavelength of the noise to be attenuated.
  • the internal volume of the burner has, at right of the entrance opening of the noise-canceling hollow space (resonant cavity or connecting tube), a section of passage of the air-gas mixture which is at least 10 times more large than the section of said inlet opening, the cross section of the air-gas mixture being the section of the internal volume of the burner taken perpendicular to the average direction of gas flow.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Fuel Cell (AREA)

Claims (11)

  1. Gasbrenner mit einem Innenraum (2, 5), der Luft ebenso wie ein Brenngas aufnimmt und über einen Verbrennungskopf (6) zur Atmosphäre hin ausmündet, wobei dieser Brenner während seines Betriebs in seinem Innenraum Geräusche erzeugt und des weiteren einen Anti-Geräusch-Hohlraum (10, 20, 30, 35) zum Erzeugen von Gegengeräuschen mit entgegengesetzter Phase zu den genannten Geräuschen in seinem Innenraum (2, 5) zumindest für eine bestimmte zu absorbierende Frequenz aufweist, welche einer vorgegebenen Wellenlänge entspricht; der Anti-Geräusch-Hohlraum durch eine massive Wandung begrenzt ist und mit dem Innenraum (2, 5) des Brenners über mindestens eine Einlaßöffnung (11, 21, 31, 35b) in Verbindung steht; die Gegengeräusche einzig mittels der Geometrie des Anti-Geräusch-Hohlraums erzeugt werden; der Innenraum ein Venturirohr (2) mit einem eingangsseitigen Ende (3) aufweist, das mit einer Brenngas-Einspritzvorrichtung (7) versehen und derart ausgebildet ist, daß es unter der Einwirkung des Einspritzens von Brenngas Luft ansaugt, wobei die genannten Geräusche erzeugt werden; die Einlaßöffnung (11, 21, 31, 35b) des Anti-Geräusch-Hohlraums mit dem Venturirohr in Verbindung steht, dadurch gekennzeichnet, daß die Einlaßöffnung (11, 21, 31, 35b) in einem zwischen 0,2 k λ und 0,3 k λ liegenden Abstand von dem eingangsseitigen Ende (3) des Venturirohrs angeordnet ist, wobei k eine ganze ungerade Zahl und λ die vorgegebene Wellenlänge ist.
  2. Brenner nach Anspruch 1, welcher eine Symmetrieebene aufweist, und mit zwei tiefgezogenen Halbschalen, die aneinander angebracht sind und jeweils eine Hälfte des Innenraums (2, 5) des Brenners sowie des Anti-Geräusch-Hohlraums begrenzen.
  3. Brenner nach einem der Ansprüche 1 und 2, bei dem der Anti-Geräusch-Hohlraum ein abgeschlossener Resonanzraum (10, 20, 35) ist, der mit dem Innenraum (2, 5) des Brenners einzig über die Einlaßöffnung (11, 21, 35b) in Verbindung steht.
  4. Brenner nach Anspruch 3, bei dem der Resonanzraum ein Resonanzrohr (10) ist, das sich über eine bestimmte Länge (l1, l2) zwischen der Einlaßöffnung (11) und einem verschlossenen Ende (12) erstreckt, wobei die Länge dieses Resonanzrohrs im wesentlichen gleich einem ganzzahligen ungeraden Vielfachen des vierten Teils der vorgegebenen Wellenlänge ist.
  5. Brenner nach Anspruch 3, bei dem das Venturirohr (2) gegen sein eingangsseitiges Ende (3) hin eine massive ringförmige Außenwandung (33) aufweist, die eine massive ringförmige Innenwandung (34) umringt, so daß sie mit der Außenwandung einen den Resonanzraum bildenden Ringraum (35) begrenzt, wobei sich dieser Resonanzraum entlang der Längsachse des Venturirohrs (2) zwischen einem zu dem eingangsseitigen Ende (3) des Venturirohrs benachbarten, verschlossenen eingangsseitigen Ende (35a) einerseits und einem ausgangsseitigen Ende (35b) andererseits erstreckt, welches eine ringförmige Öffnung bildet, welche die Einlaßöffnung des Resonanzraums darstellt, und das eingangsseitige und das ausgangsseitige Ende durch einen axialen Abstand (l10) voneinander getrennt sind, der im wesentlichen gleich einem ungeraden Vielfachen des vierten Teils der vorgegebenen Wellenlänge ist.
  6. Brenner nach einem der Ansprüche 1 und 2, bei dem der Anti-Geräusch-Hohlraum ein Verbindungsrohr (30) ist, das sich über eine bestimmte Länge (l6, l7) zwischen dem ersten und dem zweiten Ende (31, 32) erstreckt, die beide mit dem Innenraum (2, 5) des Brenners in Verbindung stehen, wobei das erste Ende (31) des Verbindungsrohrs die genannte Einlaßöffnung bildet, das zweite Ende (32) ausgangsseitig von dem ersten Ende (31) angeordnet ist, die Luft und das Brenngas, die in den Brenner übertreten, ohne das Verbindungsrohr (30) zu durchlaufen, eine vorgegebene Länge (L) zwischen den beiden Enden des Verbindungsrohrs durchlaufen, und die Länge des Verbindungsrohrs sich von der vorgegebenen Länge (L) um eine Länge n λ/2 unterscheidet, wobei n eine ganze ungerade Zahl ist.
  7. Brenner nach Anspruch 6, bei dem die Länge (l6, l7) des Verbindungsrohrs (30) größer als die vorgegebene Länge (L) ist, die von der Luft und dem Brenngas, die in den Brenner übertreten, ohne das Verbindungsrohr zu durchlaufen, zwischen den beiden Enden (31, 32) des Verbindungsrohrs durchlaufen wird.
  8. Brenner nach Anspruch 6, bei dem das Venturirohr (2) in eine eingangsseitig von dem Verbrennungskopf (6) angeordnete Vormischkammer (5) mündet, wobei die Vormischkammer (5) sich in der Längsrichtung zwischen zwei Enden (5b, 5c) erstreckt und mit dem Venturirohr (2) an einem einzigen (5b) seiner Enden in Verbindung steht, das Venturirohr entlang der Vormischkammer angeordnet ist, und die Länge (l6) des Verbindungsrohrs (30) kleiner als die vorgegebene Länge (L) ist, die von der Luft und von dem Brenngas, die in den Brenner übertreten, ohne das Verbindungsrohr zu durchlaufen, zwischen den beiden Enden (31, 32) des Verbindungsrohrs durchlaufen wird.
  9. Brenner nach einem der Ansprüche 6 bis 8, bei dem das zweite Ende (32) des Verbindungsrohrs, das mit dem Venturirohr (2) in Verbindung steht, in einem Abstand (l9) von dem eingangsseitigen Ende (3) des Venturirohrs angeordnet ist, der zwischen 0,2 q λ und 0,3 q λ liegt, wobei q eine ganze ungerade Zahl ist, die größer als k ist.
  10. Brenner nach einem vorhergehenden Ansprüche, bei dem k den Wert 1 oder 3 hat.
  11. Brenner nach einem vorhergehenden Ansprüche, bei dem der Innenraum des Brenners geradeaus von der Einlaßöffnung (11, 21, 31, 35b) des Anti-Geräusch-Hohlraums einen Querschnitt für den Durchtritt der Luft/Gas-Mischung aufweist, der mindestens zehnmal so groß wie der Querschnitt der Einlaßöffnung ist.
EP96400420A 1995-03-02 1996-02-28 Gasbrenner mit verbesserter akustischer Dämpfung Expired - Lifetime EP0730122B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9502433 1995-03-02
FR9502433A FR2731265B1 (fr) 1995-03-02 1995-03-02 Bruleur a gaz presentant une discretion acoustique amelioree

Publications (2)

Publication Number Publication Date
EP0730122A1 EP0730122A1 (de) 1996-09-04
EP0730122B1 true EP0730122B1 (de) 1999-07-28

Family

ID=9476661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400420A Expired - Lifetime EP0730122B1 (de) 1995-03-02 1996-02-28 Gasbrenner mit verbesserter akustischer Dämpfung

Country Status (4)

Country Link
EP (1) EP0730122B1 (de)
DE (1) DE69603389T2 (de)
ES (1) ES2133905T3 (de)
FR (1) FR2731265B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT409537B (de) * 1999-09-24 2002-09-25 Vaillant Gmbh Geschlossenes verbrennungssystem
ITMI20081143A1 (it) * 2008-06-25 2009-12-26 Baxi Spa Silenziatore compatto per caldaia a condensazione
US10711998B2 (en) 2017-10-03 2020-07-14 Lennox Industries Inc. Fresh air intake for low NOx emission furnace
US11187433B2 (en) 2017-10-03 2021-11-30 Lennox Industries Inc. Pre-mix burner assembly for low NOx emission furnace
US10711997B2 (en) 2017-10-03 2020-07-14 Lennox Industries Inc. Burner box liner for low NOx emission furnace
US11162677B2 (en) * 2019-01-18 2021-11-02 Lennox Industries Inc. Air intake coupling with noise suppression for low NOx emission furnace
CN210004391U (zh) * 2019-05-27 2020-01-31 浙江广涛卫厨有限公司 燃烧器的火排
CN210004392U (zh) * 2019-05-27 2020-01-31 浙江广涛卫厨有限公司 新型燃烧器的火排片

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH115352A (de) * 1925-08-28 1926-10-01 Alfred Fleisch Verfahren und Vorrichtung zur Schalldämpfung.
DE2117337C3 (de) * 1971-04-08 1978-04-20 Robert Bosch Gmbh, 7000 Stuttgart Brenner für gasbeheizte Geräte
DE2263471C3 (de) * 1972-12-27 1975-11-27 Joh. Vaillant Kg, 5630 Remscheid Als Helmholtz-Resonator ausgebildeter Schalldämpfer für einen Gerätegasbrenner
JPS63172817A (ja) * 1987-01-13 1988-07-16 Rinnai Corp 強制送風式燃焼装置
JPH07501137A (ja) * 1991-11-15 1995-02-02 シーメンス アクチエンゲゼルシヤフト ガスタービン設備の燃焼室内の燃焼振動抑制装置

Also Published As

Publication number Publication date
DE69603389T2 (de) 2000-04-13
DE69603389D1 (de) 1999-09-02
ES2133905T3 (es) 1999-09-16
EP0730122A1 (de) 1996-09-04
FR2731265B1 (fr) 1997-05-09
FR2731265A1 (fr) 1996-09-06

Similar Documents

Publication Publication Date Title
EP0730122B1 (de) Gasbrenner mit verbesserter akustischer Dämpfung
CA2200078A1 (fr) Dispositif de silencieux pour moteurs a explosion
EP0057623B1 (de) Abgassschalldämpfer einer Wärmekraftmaschine
EP0047678A1 (de) Abgas-Schalldämpfer mit innenliegender Resonanzkammer für Brennkraftmaschinen
EP3683429B1 (de) Innenstruktur eines primären ausstossrohrs
EP0934509B1 (de) Ultraschalldurchflussmesser mit verbesserter abschirmung gegen parasitäre ultraschallwellen
EP1209348B1 (de) Schalldämpfereinrichtung, insbesondere für turbogeladene Verbrennungsmotoren
FR2712851A1 (fr) Conduit de ventilation comportant un atténuateur de bruit en mousse.
WO2016193584A1 (fr) Dispositif d'atténuation des bruits de bouche et des bruits rayonnés
FR2716289A3 (fr) Couvercle insonorisant notamment pour diminuer le niveau de bruit du couvercle des soupapes.
EP3489499A1 (de) Innenstruktur eines primären ausstossrohrs
EP1433948B1 (de) Luftansaugdämpfungsanlage
EP1255071A1 (de) Schalldämmungsanordnung in einem Kreislauf eines Gasfluidums
CA2761601C (fr) Turbomoteur comportant un cone de guidage des gaz d'echappement avec un attenuateur sonore
FR2517749A1 (fr) Filtre a air pour moteur a combustion interne
EP3693597A1 (de) Akustischer resonator
FR2928705A1 (fr) Dispositif d'attenuation acoustique pour ligne d'admission d'un moteur thermique,et ligne d'admission l'incorporant.
EP0279710B1 (de) Auspuffanlage für einen Sechszylinder-V-Motor
EP3760924B1 (de) Raucherzeugungsvorrichtung mit einer schalldämmvorrichtung in einem rauchgasrohr
FR2752272A1 (fr) Dispositif d'isolation phonique pour un ventilateur
EP2857748B1 (de) Schalldämmvorrichtung für ein Rauchgasabzugsrohr eines Heizkessels
EP0332481B1 (de) Rohrförmige Kupplungsleitung mit Schalldämpfungsmitteln
FR2678681A1 (fr) Silencieux pour moteur a explosion.
FR2707341A1 (fr) Silencieux pour gaz d'échappement.
FR2854427A1 (fr) Silencieux pour gaz d'echappement de moteurs a combustion interne.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FR GB IT NL

17P Request for examination filed

Effective date: 19960918

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 19980619

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES FR GB IT NL

REF Corresponds to:

Ref document number: 69603389

Country of ref document: DE

Date of ref document: 19990902

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19990823

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2133905

Country of ref document: ES

Kind code of ref document: T3

ITF It: translation for a ep patent filed

Owner name: UFFICIO TECNICO ING. A. MANNUCCI

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20040116

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20040203

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20040312

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050208

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20050215

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20050224

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050301

BERE Be: lapsed

Owner name: *CHAFFOTEAUX ET MAURY

Effective date: 20050228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050901

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20050901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060228

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060228

Year of fee payment: 11

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20050301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060901

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060228

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20061031

BERE Be: lapsed

Owner name: *CHAFFOTEAUX ET MAURY

Effective date: 20050228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070228