EP3760924B1 - Raucherzeugungsvorrichtung mit einer schalldämmvorrichtung in einem rauchgasrohr - Google Patents

Raucherzeugungsvorrichtung mit einer schalldämmvorrichtung in einem rauchgasrohr Download PDF

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Publication number
EP3760924B1
EP3760924B1 EP20183656.6A EP20183656A EP3760924B1 EP 3760924 B1 EP3760924 B1 EP 3760924B1 EP 20183656 A EP20183656 A EP 20183656A EP 3760924 B1 EP3760924 B1 EP 3760924B1
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EP
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Prior art keywords
upstream
downstream
smoke
central tube
section
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EP20183656.6A
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English (en)
French (fr)
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EP3760924A1 (de
Inventor
Benjamin Laurent
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Poujoulat SA
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Poujoulat SA
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J13/00—Fittings for chimneys or flues 
    • 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
    • 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
    • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M20/00—Details of combustion chambers, not otherwise provided for, e.g. means for storing heat from flames
    • F23M20/005—Noise absorbing means
    • 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
    • G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/13003—Means for reducing the noise in smoke conducing ducts or systems

Definitions

  • the present invention relates to the technical field of noise attenuators (also called “silencers”) for the smoke evacuation ducts fitted to a smoke-producing device, such as a generator motor, a boiler, or the like.
  • a smoke-producing device such as a generator motor, a boiler, or the like.
  • certain appliances that produce fumes such as generator motors, boilers or others, can generate noise, in particular due to the motorization, the burner and/or or of the fan which equips them, this noise being propagated in the associated ducts or casings, in particular in the smoke evacuation ducts.
  • the sound level of this noise is sometimes significant; it is specific to each installation and is characterized by an amplitude and a frequency range (between a few tens and a few thousand Hertz).
  • noise attenuating devices also called silencers, placed on the smoke evacuation duct, between an upstream section and a downstream section of the latter.
  • noise attenuators or silencers which operate according to a so-called “reactive” principle, consisting in causing sound waves to penetrate into a cavity, in a suitable way to change its frequency.
  • Silencers of the so-called “absorptive” type are also known in which an absorptive material (in particular high-density mineral fibers) is used to seek to absorb the sound waves.
  • absorptive material in particular high-density mineral fibers
  • Such devices generally have a good efficiency for the absorption of waves in the high frequencies (up to 40dB of absorption between 1000 and 3000 Hertz), this efficiency being nevertheless reduced in the field of the low frequencies (of the order of a few dB up to 400 - 500 Hertz).
  • the document EP 2 857 748 describes for its part a noise attenuator device using both the “reactive” principle and the “absorptive” principle, so as to seek to benefit from their respective advantages.
  • the corresponding noise attenuator device comprises a central tube which is provided, taking into account the direction of movement of the smoke, with an upstream extension suitable for its connection to an upstream flue section, and with a downstream extension suitable for its connection to a section of downstream flue.
  • This central tube has perforations over part of its length and it is surrounded by an outer tube to define between them a sound absorption chamber, which outer tube is connected to said central tube, always taking into account the direction of movement of the fumes , by an upstream end wall and by a downstream end wall, which delimit the length of said acoustic absorption chamber.
  • This acoustic absorption chamber is partially filled, here in its upstream part, by an acoustic absorbent material which fills its thickness between the central tube and the outer tube.
  • the perforations of the central tube are provided on an upstream section formed facing the acoustic absorptive material and also facing a part of the acoustic absorption chamber devoid of said acoustic absorptive material.
  • a noise attenuator device is thus obtained, the absorptive part of which is located upstream, followed by the reactive part located downstream.
  • the present invention proposes a smoke-producing apparatus (such as a generator set engine, a boiler or the like), defined in claim 1.
  • the upstream part of the noise attenuator device comprises a cavity having the effect, in particular, of modifying the frequency of the waves, and the downstream part has an action of absorbing the waves, thanks to the acoustic absorptive material, in order to attenuate the sound level.
  • the absorptive part is thus located at the output of the noise attenuator device, downstream of the reactive part, and it attenuates the regenerated noise and consequently increases the performance of the silencer.
  • the cavity upstream of the sound absorption chamber is delimited, on one side, by the edge of the sound absorbing material, which also performs at this level a sound wave absorption function, contributing to improving the efficiency of the device.
  • the figures 1 to 4 illustrate a first embodiment of a noise attenuator device 1 according to the invention, intended to be integrated into the smoke evacuation duct 2 fitted to a smoke-producing device 3, for example an engine or a boiler.
  • This noise attenuator device 1 is in particular here arranged to be integrated between an upstream section 2a and a downstream section 2b of the flue 2 ( figure 4 ) to form part of this duct 2 and also to fulfill its function of reducing the noise coming from the device 3.
  • the device 3 is simply shown schematically in dotted lines at the upstream end of the upstream pipe section 2a.
  • the orientation arrow 4 illustrates the upstream/downstream direction of movement of the fumes and the sound waves in the duct 2 (and therefore also in the noise attenuator device 1).
  • This upstream/downstream direction is used in the remainder of the description to define certain structural parts of the noise attenuator device 1.
  • the upstream 12 and downstream 13 end walls extend parallel to each other. They each have a planar annular shape centered on the longitudinal axis A, and they define between them the length L of the sound absorption chamber 11.
  • Cylindrical rings, 15 and 16 respectively, extend the circular peripheral edge of the upstream 12 and downstream 13 end walls, secured to the latter by welding. These cylindrical crowns 15 and 16 extend inwards, that is to say they are oriented opposite one another.
  • the upstream 7 and downstream 9 extensions consist of cylindrical structures comprising an insulated wall, formed by two concentric tubes which sandwich an insulating material.
  • the upstream extension 7 of the central tube 5 is in the form of a male end piece which is adapted to cooperate with a female end piece of the upstream flue section 2a, and its downstream extension 9 is in the form of a female end piece adapted to cooperate with a male end of the downstream flue section 2b.
  • upstream 7 and downstream 9 extensions extend mainly outwards from the end walls 12 and 13, their inner tube 7a, 9a being joined by welding with the edge of the central orifice of said end walls 12 , 13, and their outer tube 7b, 9b being secured by welding against the outer face of said end walls 12, 13.
  • An inner section 7a1, 9a1 of the inner tubes 7a, 9a of the upstream 7 and downstream 9 extensions extends towards the inside of the sound absorption chamber 11. These two inner sections 7a1, 9a1 extend opposite one on the other, and they receive by simple fitting the upstream 6 and downstream 8 ends of the central tube 5.
  • the outer tube 10 consists of a cylindrical shell obtained from a curved plate, the two facing longitudinal edges of which, following the bending, are assembled together by welding, and the upstream and downstream ends of which are secured by removable interlocking with the aforementioned cylindrical crowns 15 and 16 which extend the circular peripheral edge of the upstream 12 and downstream 13 end walls. This connection by interlocking is locked by means of assembly collars 17 and 18.
  • the central tube 5, the outer tube 10, the end walls 12 and 13 and the two concentric tubes of the extensions 7 and 9 are made of metallic material, preferably stainless steel (for example of the 316L type) to suitably withstand corrosion and condensation. It is possible for this to use a metal sheet whose thickness is of the order of 0.4 to 2 mm.
  • the upstream section 5a and the downstream section 5b of the central tube 5 are juxtaposed and they extend together over the entire length L of the sound absorption chamber 11.
  • the length C of the upstream section 5a of the central tube 5 is preferably between half and 3/4 of the length L, the length D of the downstream section 5b occupying the rest of this length L.
  • the perforations 20 are adapted in size and number to allow the sound waves to penetrate as much as possible into the acoustic absorption chamber 11, while allowing the central tube 5 to correctly maintain the acoustic absorbent material 14.
  • the perforations 20 of the downstream section 5b of the central tube 5 are made homogeneously over the entire surface of the wall concerned, and they have a diameter which is preferably between 5 and 20 mm (more preferably between 10 and 15 mm). These perforations occupy 15 to 70% of the wall surface of the tube section 5b (preferably 45 to 60% of this wall surface).
  • the inner section 9a1 of the inner tube 9a in which the downstream end 8 of the central tube 5 is fitted, has openings or perforations 9a2.
  • These perforations 9a2 of the inner section 9a1 are adapted to limit (or avoid) the blocking of the perforations 20 of the downstream end of the central tube 5 and thus ensure that the corresponding perforated zone extends well to the end wall downstream 13.
  • the sound absorption chamber 11 is generally annular in shape with a constant section, and it is delimited by the central tube 5, the outer tube 10, the upstream end wall 12 and the downstream end wall 13.
  • This sound absorption chamber 11 here comprises an empty upstream part 11a, devoid of filling material, forming a cylindrical annular cavity, followed by a downstream part 11b which is filled with the acoustic absorptive material 14.
  • the upstream part 11a of the sound absorption chamber 11, of length E, extends from the upstream end wall 12 to a plane F perpendicular to the longitudinal axis A, located downstream of the aforementioned intermediate zone 19, separating the zone not perforated 5a of the perforated zone 5b of the central tube 5, and corresponding to the upstream end edge 14a of the sound absorption material 14.
  • the cavity-shaped upstream part 11a of the sound absorption chamber 11, of length E therefore comprises - an upstream part 11a', of length C, which surrounds the full upstream section 5a of the central tube 5, and - a downstream 11a", of length G, which surrounds an upstream part 5b1 of the perforated downstream section 5b of the central tube 5.
  • This cavity 11a of the sound absorption chamber 11 is delimited a/ by the upstream part of the outer tube 10, b/ by the upstream end edge 14a of the sound absorption material 14, c/ by the end wall upstream 12, and d/ by a part of the central tube 5 (comprising the unperforated upstream part 5a followed by the perforated upstream part 5b1 of the perforated downstream section 5b of the central tube 5).
  • the length G of this perforated upstream part 5b1 surrounded by the downstream cavity part 11a", between the aforementioned planes B and F, corresponds between 1/6th and 1/2 of the length E of the cavity 11a.
  • the acoustic absorbent material 14 is in the form of an annular cylinder delimited a/ by the upstream end edge 14a, extending in a plane perpendicular to the longitudinal axis A and corresponding to the aforementioned plane F located downstream of the intermediate zone 19, b/ by an upstream end edge 14b, extending in a plane perpendicular to the longitudinal axis A, arranged close to the downstream end wall 13 or resting against the latter, c/ by an outer cylindrical surface 14c, in contact with the inner face of the outer tube 10, and, d/ by an inner cylindrical surface 14d, in contact with the outer face of the central tube 5.
  • the length of the cylinder made of acoustic absorbent material 14, between its upstream 14a and downstream 14b end edges corresponds to the length H of the downstream part 11b of the acoustic absorption chamber 11, and the whole of this length is opposite of a perforated part of the central tube 5.
  • the acoustic absorbent material 14 here consists of high density mineral fibers, for example rock wool whose density is between 30 and 140 kg/m 3 , preferably between 60 and 120 kg/m 3 .
  • the length H of the downstream part 11b of the acoustic absorption chamber 11, filled with the acoustic absorptive material 14, corresponds between 1/3 and 2/3 of the length L of said chamber 11.
  • the length L of the sound absorption chamber 11 can be between 700 and 1000 mm, and its thickness between 100 and 150 mm; the diameter of the central tube 5 can, for its part, be between 130 and 600 mm.
  • the cylinder of acoustic absorbent material 14 is preferably produced by means of two complementary half-shells 141, 142, each half-cylindrical, as illustrated in the picture 2 . This feature facilitates the assembly and replacement of the acoustic absorbent material, in the event of degradation or fouling.
  • This cylinder 14 of acoustic absorbent material can be protected by a fiberglass fabric provided on the internal face of the acoustic absorbent material 14, pressed against the central tube 5.
  • the acoustic absorbent material 14 is held in position at its upstream end edge 14a by small retaining tabs 22 which extend in the plane F, perpendicular to the longitudinal axis A.
  • These retaining tabs 22 are advantageously obtained in the material of the central tube 5 by suitable cutting and folding at right angles. They can also be attached and fixed by welding.
  • the noise attenuator device 1 comprises a purge system 23 adapted to ensure the evacuation of the condensates.
  • This purge system 23 is formed of a purge orifice associated with a removable obturator plug, and it is arranged near the upstream extension 7 of the male type, here on the outer tube 10 next to the upstream end wall 12 .
  • this purge system 23 can be positioned on the upstream end wall 12.
  • the evacuation of the condensates can also be carried out by means of a suitable orifice (not shown), passing through the upstream end 6 of the central tube 5, as well as the inner section 7a1 of the inner tube 7a.
  • Such a noise attenuator device structure makes it possible to effectively absorb the sound waves emitted by the device 3, and which propagate in the smoke evacuation duct 2.
  • Such a device makes it possible to trap the sound waves by the acoustic absorptive material 14, and also by the cavity 11a, this effectively over a wide range of wave frequencies.
  • the positioning of the acoustic absorptive material 14 downstream of the cavity 11a also makes it possible to attenuate the noise regenerated in the absorber device 1, in particular in the case of rapid flow of gas flows.
  • the figures 5 and 6 illustrate another embodiment of a noise attenuator device according to the invention.
  • This noise attenuator device 1' has a structure very similar to that of the embodiment illustrated in the figures 1 to 4 . It also comprises an absorption core fitted inside the central tube, making it possible in particular to limit the air path in the case of large central tube diameters.
  • the noise attenuator device 1' therefore comprises a central tube 5 provided with two end extensions 7 and 9 and surrounded by an outer tube 10.
  • This outer tube 10 is assembled with the central tube 5 by the upstream end wall 12 and by the downstream end wall 13 to define the annular sound absorption chamber 11.
  • the upstream section 5a of the central tube 5 is solid (non-perforated) and it extends as far as the intermediate zone 19. This solid section 5a is extended by a perforated downstream section 5b.
  • a ring of acoustic absorbent material 14 fills the downstream part 11b of the acoustic absorption chamber 11, from the plane F located downstream of the aforementioned intermediate zone 19.
  • a complementary absorption core 24 is mounted inside the central tube 5, on the longitudinal axis A of the latter.
  • This inner absorption core 24 is in the general form of a cylinder whose diameter is less than the diameter of the central tube 5, assembled with the inner face of the latter by means of spacer tabs 25.
  • This absorption core 24 comprises a cylindrical outer casing 26 which is provided with perforations 27; this envelope 26 is filled with an acoustic absorbent material 28.
  • the outer casing 26 of the absorption core 24 is made of stainless steel, for example of the 316L type.
  • the perforations 27 are distributed evenly over the entire surface of the outer casing 26 and they occupy between 40 and 60% of the surface of this casing.
  • the acoustic absorbent material 28 preferably consists of rock wool whose density is between 30 and 140 kg/m 3 , preferably between 60 and 80 kg/m 3 .
  • At least the upstream end 29 of the absorption core 24 is in the shape of an ogive (or of a dome) to limit disturbances to the flow of smoke.
  • downstream end 30 of the absorption core 24 is also in the form of an ogive.
  • This absorption core 24 extends over part of the length of the central tube 5; preferably it extends inside the perforated downstream section 5b of said central tube 5. In this case, the absorption core 24 here extends over the entire or practically the entire length of this perforated downstream section 5b, and over the entire length occupied by the cylinder of acoustic absorptive core 14.
  • This absorption core 24 has the function and the advantage of adding absorptive material to compensate for the large internal diameter of the sound absorption device, in particular in the case of internal tubes having a diameter greater than or equal to 350 mm.
  • the figure 7 illustrates yet another embodiment of a noise attenuator device 1" in accordance with the invention.
  • This noise attenuator device 1" therefore comprises a central tube 5 provided with two end extensions 7 and 9 and surrounded by an outer tube 10.
  • This outer tube 10 is assembled with the central tube 5 by the upstream end wall 12 and by the downstream end wall 13 to define the annular chamber 11.
  • the central tube 5 comprises a non-perforated upstream section 5a up to the intermediate zone 19, followed by a perforated downstream section 5b.
  • a ring of acoustic absorbent material 14 fills the downstream part 11b of the absorption chamber 11.
  • an inspection hatch 31 is provided in the outer tube 10, opening into the upstream part 11a in the form of a cavity.
  • This inspection hatch 31 is formed of a cylindrical ferrule 32 fixed to the outer tube 10 (along an axis perpendicular to the axis of this outer tube 10), associated with an insulated removable plug 33.
  • a cutout/opening 34 is provided in the central part of the central tube 5 opposite the inspection hatch 31, to allow access to the interior of this central tube 5.
  • Such an inspection hatch 31 allows maintenance of the device, in particular when it is placed on conduits serving boilers using solid fuel such as wood.
  • This type of inspection hatch can of course also be fitted in attenuating devices with an absorption core, as illustrated in the figures 5 and 6 .
  • the upstream section 5a of the central tube 5 preferably has no perforations or openings. However, one or a few perforations/openings can be provided, depending on the needs, (as in the embodiment of the figure 7 ), without occupying a large wall surface. This perforated/open wall surface of the upstream section 5a will in any event be smaller than that of the downstream section 5b.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Exhaust Silencers (AREA)

Claims (12)

  1. Rauchgaserzeugungsvorrichtung (3) wie zum Beispiel ein Motor eines Stromaggregats, eine Heizung oder anderes mit einem Rauchgasabzugsrohr (2), wobei das Rauchgasabzugsrohr (2), in der Strömungsrichtung des Rauchgases gesehen, einen Rauchgasrohrabschnitt (2a), eine Schalldämmvorrichtung (1, 1', 1") und einen stromabwärtigen Rauchgasrohrabschnitt (2b) aufweist, wobei die Schalldämmvorrichtung (1, 1', 1") ein zentrales Rohr (5) aufweist, das, in der Strömungsrichtung des Rauchgases gesehen, mit einer stromaufwärtigen und mit dem stromaufwärtigen Rauchgasrohrabschnitt (2a) verbundenen Verlängerung (7) und einer stromabwärtigen und mit dem stromabwärtigen Rauchgasrohrabschnitt (2b) verbundenen stromabwärtigen Verlängerung (9) versehen ist, wobei das zentrale Rohr (5) Löcher (20) aufweist und von einem äußeren Rohr (10) umgeben ist, um zwischen diesen beiden eine akustische Absorptionskammer (11) zu definieren, wobei das äußere Rohr (10), immer noch in der Strömungsrichtung des Rauchgases gesehen, durch eine stromaufwärtige Endwand (12) und eine stromabwärtige Endwand (13) mit dem zentralen Rohr (5) verbunden ist, die die Länge (L) der akustischen Absorptionskammer (11) begrenzen, wobei die akustische Absorptionskammer teilweise mit einem Schall absorbierenden Material (14) ausgefüllt ist, das die Dicke zwischen dem zentralen Rohr (5) und dem äußeren Rohr (10) über einen Teil seiner Länge (L) ausfüllt,
    dadurch gekennzeichnet, daß (a) das zentrale Rohr (5) einen stromaufwärtigen vollen, keine oder praktisch keine Löcher aufweisenden Abschnitt (5a) aufweist, der sich von der stromaufwärtigen Endwand (12) bis zu einer zwischen der stromaufwärtigen Endwand (12) und der stromabwärtigen Endwand (13) liegenden Zwischenzone (19) erstreckt, wobei (b) der stromaufwärtige volle Abschnitt (5a) durch einen stromabwärtigen, mit Löchern versehenen Abschnitt (5b) verlängert ist, der sich von der Zwischenzone (19) bis zur stromabwärtigen Endwand (13) oder ungefähr bis zur stromabwärtigen Endwand (13) erstreckt,
    und daß das Schall absorbierende Material (14) (i) durch einen stromabwärtig zur Zwischenzone (19) liegenden stromaufwärtigen Endrand (14a) und (ii) durch einen in der Schall absorbierenden Kammer (11) in der Nähe der stromabwärtigen Endwand (13) oder an diese angrenzend angeordneten stromabwärtigen Endrand (14b) begrenzt ist,
    wobei der Raum der Schall absorbierenden Kammer (11) zwischen der stromaufwärtigen Endwand (12) und dem stromaufwärtigen Endrand (14a) des Schall absorbierenden Materials (14) aus einem Hohlraum besteht, von dem ein stromaufwärtiger Teil (11a') den stromaufwärtigen vollen Abschnitt (5a) des zentralen Rohrs (5) umgibt und von dem ein stromabwärtiger Teil (11a") einen stromaufwärtigen gelochten Teil (5b1) des zentralen Rohrs (5) umgibt.
  2. Rauchgaserzeugungsvorrichtung (3) gemäß Anspruch 1, dadurch gekennzeichnet, daß das zentrale Rohr (5) der Schalldämpfungsvorrichtung einen kreisrunden Querschnitt hat und eine Längsachse (A) aufweist, auf die die stromaufwärtige (7) und die stromabwärtige (9) Verlängerung zentriert sind, wobei die Schall absorbierende Kammer (11) einen allgemeinen zylindrischen ringförmigen Querschnitt hat, eine konstante Dicke aufweist und auf die Längsachse (A) des zentralen Rohrs (5) zentriert ist.
  3. Rauchgaserzeugungsvorrichtung (3) gemäß einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das Schall absorbierende Material (14) der Schalldämpfungsvorrichtung aus Steinwolle besteht, deren Dichte zwischen 30 und 140 kg/m3, vorzugsweise zwischen 60 und 120 kg/m3, beträgt.
  4. Rauchgaserzeugungsvorrichtung (3) gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Durchmesser des zentralen Rohrs (5) der Schalldämpfungsvorrichtung zwischen 130 und 600 mm beträgt, daß die Dicke der Schall absorbierenden Kammer (11) zwischen 100 und 150 mm beträgt und daß die Länge der Schall absorbierenden Kammer (11) zwischen 700 und 1000 mm beträgt.
  5. Rauchgaserzeugungsvorrichtung (3) gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sich das Schall absorbierende Material (14) zwischen einem Drittel und zwei Dritteln der Länge (L) der Schall absorbierenden Kammer (11) erstreckt und daß sich der stromaufwärtige gelochte Teil (5b1) des zentralen Rohrs (5), der vom stromabwärtigen Teil der Kammer (11a") umgeben ist, über eine Länge zwischen einem Sechstel und der Hälfte der Länge der besagten Kammer (11a) erstreckt.
  6. Rauchgaserzeugungsvorrichtung (3) gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Löcher (20) des stromabwärtigen Abschnitts (5b) des zentralen Rohrs (5) der Schalldämmvorrichtung einen Durchmesser von 5 bis 20 mm haben und 15 bis 70 % der Oberfläche des stromabwärtigen Abschnitts (5b) des zentralen Rohrs bedecken.
  7. Rauchgaserzeugungsvorrichtung (3) gemäß einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das äußere Rohr (10) der Schalldämmvorrichtung in abnehmbarer Weise mit den zylindrischen Kränzen (15, 16), die die stromaufwärtige (12) und die stromabwärtige (13) Endwand verlängern, durch Klemmringe (17, 18) verbunden ist.
  8. Rauchgaserzeugungsvorrichtung (3) gemäß einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Schalldämmvorrichtung einen inneren Absorptionskern (24) von im Allgemeinen zylindrischer Form aufweist, koaxial zum zentralen Rohr (5) in diesem angebracht ist, wobei der Kern (24) einen kleineren Durchmesser als dem Durchmesser des zentralen Rohrs (5) aufweist, ein stromaufwärtiges, zur stromaufwärtigen Verlängerung (7) hin gerichtetes, spitzbogenartig zulaufendes Ende aufweist und eine äußere, mit Löchern (27) versehene und mit einem Schall absorbierenden Material (28) gefüllte äußere Hülle (26) aufweist.
  9. Rauchgaserzeugungsvorrichtung (3) gemäß einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Schalldämmvorrichtung eine im äußeren Rohr (10) eingerichtete Inspektionsöffnung (31) zusammen mit einem abnehmbaren Stopfen (33) aufweist.
  10. Rauchgaserzeugungsvorrichtung (3) gemäß einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Kammer (11a) der Schall absorbierenden Kammer (11) der Schalldämmvorrichtung auf einer Seite durch den stromaufwärtigen Endrand (14a) des Schall absorbierenden Materials (14) begrenzt ist.
  11. Rauchgaserzeugungsvorrichtung (3) gemäß einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die stromaufwärtige Verlängerung (7) des zentralen Rohrs (5) der Schalldämmvorrichtung die Form eines massiven Endstücks aufweist, das dazu ausgelegt ist, mit einem hohlen Endstück eines stromaufwärtigen Rauchgasrohrabschnitts (2a) zusammenzuwirken, und daß die stromabwärtige Verlängerung (9) des zentralen Rohrs (5) der Schalldämmvorrichtung die Form eines hohlen Endstücks aufweist, das dazu ausgelegt ist, mit einem massiven Endstück eines stromabwärtigen Rauchgasrohrabschnitts (2b) zusammenzuwirken.
  12. Rauchgaserzeugungsvorrichtung (3) gemäß einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß die stromabwärtige Verlängerung (9) des zentralen Rohrs (5) der Schalldämmvorrichtung einen inneren Rohrabschnitt (9a1) aufweist, der sich nach innen hin erstreckt und der das stromabwärtige Ende (8) des zentralen Rohrs (5) durch Einstecken aufnimmt, wobei der innere Rohrabschnitt (9a1) mit Löchern (9a2) versehen ist.
EP20183656.6A 2019-07-03 2020-07-02 Raucherzeugungsvorrichtung mit einer schalldämmvorrichtung in einem rauchgasrohr Active EP3760924B1 (de)

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FR1907419A FR3098280B1 (fr) 2019-07-03 2019-07-03 Dispositif atténuateur de bruit pour un conduit d’évacuation de fumée équipant un appareil producteur de fumée

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GB403651A (en) * 1931-06-20 1933-12-20 Burgess Lab Inc C F Silencer for gaseous currents
US3757892A (en) * 1972-04-03 1973-09-11 Skyway Machine Inc Exhaust unit for combustion engine
JP5450499B2 (ja) * 2011-04-18 2014-03-26 本田技研工業株式会社 消音器
FR3011617B1 (fr) 2013-10-03 2015-10-23 Poujoulat Dispositif attenuateur de bruit pour un conduit d'evacuation de fumee equipant une chaudiere

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