EP2594853B1 - Dampfabzugshaube mit geringer Geräuschentwicklung - Google Patents

Dampfabzugshaube mit geringer Geräuschentwicklung Download PDF

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Publication number
EP2594853B1
EP2594853B1 EP12192948.3A EP12192948A EP2594853B1 EP 2594853 B1 EP2594853 B1 EP 2594853B1 EP 12192948 A EP12192948 A EP 12192948A EP 2594853 B1 EP2594853 B1 EP 2594853B1
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EP
European Patent Office
Prior art keywords
hood
conduit
electro
axis
sound
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EP12192948.3A
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English (en)
French (fr)
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EP2594853A1 (de
Inventor
Pietro Massini
Massimiliano Caimmi
Francesco Violi
Marco Vizzaccaro
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Ask Industries SpA
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Ask Industries SpA
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
    • 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
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • 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
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17861—Methods, e.g. algorithms; Devices using additional means for damping sound, e.g. using sound absorbing panels
    • 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
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/105—Appliances, e.g. washing machines or dishwashers
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/111—Directivity control or beam pattern
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/129—Vibration, e.g. instead of, or in addition to, acoustic noise
    • G10K2210/1291—Anti-Vibration-Control, e.g. reducing vibrations in panels or beams

Definitions

  • the present patent application for industrial invention relates to a low-noise fume extractor hood.
  • an extractor hood comprises a fan disposed in an extractor conduit provided with inlet filter.
  • the fan is driven into rotation by an electric motor in order to extract fumes through the extraction conduit.
  • Said types of hoods are impaired by the very high noise level, both for the noise generated by motor, fan, and other mechanical moving parts, for the noise generated by the turbulent vortical air flow that is extracted in the conduit of the hood, and for the noise of the air passing through the inlet filter.
  • Patent application EP 0 596 846 discloses a kitchen extractor hood provided with active noise suppression system.
  • the hood is provided with microphones to detect noise, a loudspeaker generating a sound adapted to suppress noise and a control unit that controls the loudspeaker according to the noise detected by the microphones.
  • the single loudspeaker is disposed with axis of emission substantially horizontal to the axis of conduit of hood, which is substantially vertical.
  • Patent applications US 2004/194776 and WO2010094718 disclose a hood with noise suppression system that provides for a loudspeaker disposed in central position inside the conduit of the hood. Said position of the loudspeaker results in a series of drawbacks, because of turbulence of the air flow extracted in the conduit of the hood that meets with the central support of the loudspeaker. Consequently, it is necessary to increase the power of motor, so that the flow of extracted air passes beyond the obstacle represented by the loudspeaker. Moreover, the loudspeaker in central position tends to get dirty because of direct contact with fumes extracted by the hood.
  • the known active noise suppression systems provide for one loudspeaker only, and do not allow for directivity of the sound signal beam, unless very expensive loudspeakers are used. Instead, according to the position of the hood, it is especially important to direct the sound beam of loudspeakers in a preferential direction with higher noise.
  • EP 0 671 720 discloses a hood with noise suppression system that can comprise one or more loudspeakers. However, EP 0 671 720 illustrates only one loudspeaker with emission surface parallel to axis of conduit of hood.
  • WO01/6359 discloses a generic active noise reduction system not applied to an air extraction conduit. WO01/6359 teaches that loudspeakers must be generally disposed on a plane, but such a condition is not essential.
  • EP 0 961 087 discloses a fan provided with active noise suppression system.
  • active noise suppression systems take into account only the noise generated by air extraction and do not consider the noise generated by vibration of walls of conduit housing fan and motor of hood.
  • the purpose of the present invention is to eliminate the drawbacks of the prior art by devising a low-noise fume extractor hood provided with active noise suppression system that does not obstruct the air extraction flow and at the same time allows for directivity of sound beam.
  • Another purpose of the present invention is to provide a low-noise extractor hood that is able to suppress also the vibration noise of the parts of the hood conduit.
  • the fume extractor hood of the invention comprises:
  • Said muffler module comprises at least two electro-acoustic transducers connected to the walls of said bearing frame, in opposite positions with respect the axis of conduit, in such manner to leave the central part of said conduit free.
  • Each electro-acoustic transducer has a sound emission surface inclined by an angle comprised in the range from 40° to 65° with respect to the axis of conduit to generate a sound beam with axis inclined by an angle lower than 90° with respect to axis of conduit.
  • the sound beams coming from said at least two electro-acoustic transducers can be combined to obtain a resulting sound beam that can be directed in a preferred direction by means of beam forming algorithms.
  • a low-noise fume extractor hood is disclosed, generally indicated with numeral (1).
  • the hood (1) comprises a box (2) containing an electric motor (20) that drives into rotation at least one fan (21) to extract fumes ejected from a discharge conduit (22).
  • the hood (1) comprises two fans (21) with horizontal axis of rotation that, by means of centrifugal force, cause extraction of fumes through lateral inlets (23) provided with grilles and discharge of fumes through the discharge conduit (22).
  • the box (2) of the motor-fan assembly comprises two lateral walls (24) opposite to the inlets (23) of the fans.
  • the lateral walls (24) are made of rigid material, such as plastics or wood, and act as bearing frame.
  • the parallelepiped structure of the aesthetic casing (25) is provided with upper opening for the discharge conduit (22) and lower opening closed by a partition plate (29) in horizontal position.
  • the partition plate (29) is laterally provided with peripheral grilles (26) for passage of air extracted by the fans.
  • a box (27) with the electronic components of the hood (1) is disposed above the partition plate (29). Instead, a wedge (28) made of sound absorbent material is disposed under the partition plate (29), in such manner to direct the flow of extracted air towards the peripheral grilles (26) of the partition plate.
  • At least one inertial actuator/shaker (3) is disposed on the aesthetic casing (25) of the box of the motor-fan assembly.
  • the inertial actuator/shaker (3) is known from patent application WO2011/029768 , and therefore a detailed description is omitted.
  • the base of the inertial actuator/shaker (3) is fixed to the sheet metal of the aesthetic casing (25) in order to cause vibration.
  • two inertial actuators/shakers (3) are used in diametrally opposite positions, respectively on the front side and back side of the aesthetic casing, in such manner that the axis joining the two shakers (3) is orthogonal to the axis of rotation of motor (20).
  • said inertial actuators/shakers (3) are disposed on the external surface of the aesthetic casing (25). In fact, it is to be considered that said inertial actuators/shakers have very small thickness and therefore have no aesthetic impact on the hood.
  • At least one accelerometer (9) is disposed on the sheet metal (25) next to said inertial actuator / shaker (3).
  • the accelerometer (9) detects the vibrations of sheet metal (25). Shakers similar to the aforementioned ones can be used as accelerometers.
  • a muffler module (4) is fixed to the lower part of the box (2) of the motor-fan assembly.
  • the muffler module (4) has a parallelepiped bearing frame, substantially similar to the one of the box (2) of the motor-fan assembly, in such manner to define an air extraction conduit (C) with vertical axis (A).
  • the bearing frame of the muffler module (4) comprises two lateral walls (40), a front wall (41) adapted to be faced towards the user and a back wall (42).
  • Walls (40, 41, 42) are made of rigid material, such as plastics, sheet metal or wood and are externally covered with an aesthetic casing (not shown in the drawings), similar to the sheet casing (25) of the box of the motor-fan assembly.
  • each underframe (43) is fixed to the lateral walls (40) of the bearing frame, protruding inwards in such manner to define two opposite chambers (44).
  • Each underframe (43) comprises:
  • the underframe (43) When seen in axial sectional view, the underframe (43) is substantially shaped as a trapezium, and defines a narrowing of the conduit (C) of the muffler module.
  • the conduit (C) has a tapered inlet section (C1) with decreasing dimensions, an intermediate section (C2) with constant dimensions and a tapered outlet section (C3) with increasing dimensions.
  • This structure of the conduit (C) favors air extraction without causing obstacles and turbulence to air flow.
  • the tapered inlet section (C1) acts as invitation to air inlet into conduit
  • the tapered outlet section (C3) acts as conveyor to convey air towards the grilles (26) of the partition wall (29) of the box of the motor-fan assembly.
  • At least one electro-acoustic transducer (5) is mounted on the lower wall (45) of each underframe, in such manner that the magnetic assembly of the electro-acoustic transducer (5) is contained inside the chamber (44) of the underframe.
  • the transducer (5) has a sound emission surface (50) disposed on the lower wall (45) facing the outside of the chamber (44).
  • two electro-acoustic transducers (5) are mounted in each lower wall of the underframes.
  • two opposite linear arrays are defined, each array being formed of two electro-acoustic transducers.
  • the electro-acoustic transducer (5) is preferably a traditional loudspeaker provided with vibrating membrane with sound emission.
  • the electro-acoustic transducer (5) can be a shaker that puts into vibration the lower wall (45) of the underframe in order to generate sound.
  • the loudspeaker (5) has a sound emission surface (50) that generates a sound beam with axis (S) orthogonal to the sound emission surface (50).
  • the speaker (5) is arranged in such way that the sound emission surface (50) is inclined by an angle ( ⁇ ) with respect to the axis (A) of conduit of the muffler module and axis (S) of sound beam is inclined by an angle ( ⁇ ) with respect to axis (A) of conduit of the muffler module.
  • Angle ( ⁇ ) can vary from 40° to 65°.
  • the SPL is higher along axis (S) of the loudspeaker with respect to the one obtained when moving away from the axis (S) of the loudspeaker. For this reason, after experimental tests, the range of angle ( ⁇ ) from 0 to 40° was excluded because with such an inclination of the loudspeaker, the sound pressure did not come out properly from the conduit of the hood and noise suppression did not effectively cover the acoustic field of users. Moreover, it must be considered that the sound emission surface (50) of the loudspeaker is flush with the lower wall (45) of the frame that generates the tapered section (C1) for air inlet in the conduit of the hood.
  • the applicant discovered that in the range of angle ( ⁇ ) from 65° to 90° air impacted on the lower part (45) and on the sound emission surface (50) of loudspeakers, generating excessive capacity losses and a turbulent flow of localized air that is a source of additional noise. Consequently, also the range of angle ( ⁇ ) from 65° to 90° was excluded. According to the above considerations, the sound emission surface (50) of loudspeaker must be advantageously inclined with respect to axis (A) of the conduit by an angle ( ⁇ ) comprised in the range from 40° to 65°.
  • An angle of approximately 45° ( ⁇ ) was advantageously chosen because it is the ideal compromise between changing the directivity of the sound beam emitted by loudspeakers and avoiding obstacles for the extracted air flow.
  • the frame can have any shape, such as for example, a pentagonal, hexagonal, circular, elliptical, etc. cross-section.
  • one underframe (43) can be provided with truncated-conical lower wall (45) with decreasing diameter, cylindrical central wall (46) and truncated-conical upper wall (47) with increasing diameter.
  • the lower wall (45) can be provided with a plurality of loudspeakers (5) disposed in circular arrangement with regular spacing angularly.
  • the back wall (42) is provided with a box (48) facing inwards in order to contain the electronic components of the active noise suppression system.
  • the box (48) can be omitted and the electronic components of the active noise suppression system can be integrated in the box (27) together with the electronic components for operation of hood.
  • At least one picking up microphone (6) is disposed in at least one underframe (43) above the loudspeakers (5).
  • the picking up microphone (6) is adapted to detect the noise generated by the hood.
  • two picking up microphones (6) are provided in diametrally opposite positions, at the upper end of the central wall (46) of the underframes.
  • At least one error microphone (7) is disposed under the loudspeakers (5).
  • the error microphone is adapted to detect a noise cancellation error, in such manner to send an error signal in retraction to correct the noise cancellation made by the loudspeakers (5).
  • Figs. 3 - 5 four error microphones (7) are preferably provided and disposed at the lower ends of the four walls (40, 41, 42) of the bearing frame of the muffler module, in diametrally opposite positions and regularly spaced.
  • only one error microphone (7) can be provided and disposed in correspondence of the axis (A) of conduit of the noise suppression module supported by thin brackets in order not to interfere with the extracted air flow.
  • Sound absorbent material (49) is disposed on the internal side of the walls (40, 41, 42) of the frame of the muffler module, in such manner to cover the underframes (43) and eventually the electronics box (48). In this way, the channel (C) is surrounded by sound absorbent material (49). In particular, it is important that the sound absorbent material (49) is situated between picking up microphones (6) and error microphones (7).
  • Figs. 7 and 8 show an operating diagram of the low-noise extractor hood of the invention.
  • the picking up microphones (6) detect the noise generated in the conduit (C) of the muffler module (4). Such noise is caused by air extraction in conduit (C), by noise of fan and motor and by vibrations of walls (25) of box with motor-fan assembly.
  • the picking up microphones (6) send an indicative signal of the noise to a control unit (8) composed of a DSP digital signal processor.
  • the DSP (8) provides for an algorithm for active cancellation of the ANC noise (80) in order to control the loudspeakers (5) that emit anti-noise sound that cancels the noise generated in the hood.
  • the DSP (8) also controls shakers (3) in such manner to make the wall (25) of the box of motor-fan assembly vibrate with vibration opposed to vibration imposed by the motor-fan assembly. Shakers (3) do not emit a sound, but attenuate vibrations on the wall (25) of the box of the motor-fan assembly.
  • Accelerometers (9) are connected to the DSP (8), therefore the DSP (8) controls shakers (3) in such manner to minimize acceleration of sheet metal (25) detected by accelerometers (9).
  • Error microphones (7) detect the noise coming out from the muffler module (4), that is the noise that was not suppressed by loudspeakers (5). Therefore, error microphones (7) send an error signal to the DSP (8), which is indicative of the noise that was not suppressed by loudspeakers. According to the ANC algorithm (80), the DSP uses said error signal to correct the anti-noise sound emitted by the loudspeakers (5) and the attenuation of vibration of sheet metal (25) generated by shakers (3). If accelerometers (9) are provided, the ANC algorithm (80) also processes the signal received from the accelerometers (9) to control the attenuation of vibrations by shakers (3) more accurately.
  • the hood of the invention provides at least for two loudspeakers (5) with noise emission surface inclined by an angle ( ⁇ ) lower than or equal to 65° with respect to axis (A) of conduit of the muffler module, allows for implementing a beam forming algorithm to direct the sound beam of the loudspeakers (5) towards a desired direction where noise must be suppressed.
  • ⁇ angle
  • A axis
  • signals coming from picking up microphones (6) and error microphones (7) undergo beam forming algorithms (81, 82) to detect the direction of the sound beam obtained from the combination of beams coming out of the four loudspeakers (5). Therefore, according to information obtained with the beam forming algorithms (81, 82) of picking up microphones and error microphones, the ANC noise suppression algorithm (80) generates a beam forming outlet (83) to direct amplifiers of loudspeakers (5) that will emit beams with different sound intensity, in such manner to generate a resulting beam directed towards the desired direction.
  • Fig. 8 shows the solution wherein the electronics for active noise cancellation is integrated in the same box (24) with electronics (100) for operation of the hood, viz. for operation of fan, motor and control panel of hood.

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  • 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)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Motor Or Generator Frames (AREA)
  • Ventilation (AREA)

Claims (11)

  1. Dunstabzugshaube (1), umfassend:
    - ein Gehäuse (2) enthaltend eine Motor-Gebläse-Gruppe umfassend einen Motor (20), der mindestens ein Gebläse (21) betätigt, und
    - ein Schalldämpfermodul (4), das unterhalb des Gehäuses (2) der Motor-Gebläse-Gruppe angeordnet ist, wobei das Schalldämpfermodul (4) Folgendes umfasst:
    - ein tragendes Gestell (40, 41, 42), das eine Rohrleitung (C) zur Luftansaugung mit einer Achse (A) bildet,
    - ein aktives Geräuschunterdrückungssystem, umfassend mindestens zwei elektroakustische Wandler (5) und mindestens zwei Mikrofone (6, 7), die an eine Steuereinheit (8) angeschlossen sind,
    - ein passives Geräuschunterdrückungssystem, umfassend ein schalldämpfendes Material (49), das zwischen den Mikrofonen (6, 7) angeordnet ist,
    dadurch gekennzeichnet, dass
    die zwei elektroakustischen Wandler (5) mit den Wänden (40) des tragenden Gestells an gegenüberliegenden Stellungen in Bezug auf die Achse (A) der Rohrleitung verbunden sind, derart, dass der mittlere Teil der Rohrleitung (C) frei bleibt;
    jeder elektroakustische Wandler (5) eine Schallemissionsfläche (50) aufweist, die in einem Winkel (θ) im Bereich von 40° bis 65° in Bezug auf die Achse (A) der Rohrleitung geneigt ist, um einen Schallstrahl mit einer Achse (S) zu erzeugen, die in einem Winkel (α) kleiner als 90° in Bezug auf die Achse (A) der Rohrleitung geneigt ist, derart, dass die Schallstrahlen, die aus den beiden elektroakustischen Wandlern austreten, miteinander kombiniert werden können, wodurch ein resultierender Schallstrahl erhalten wird, der mittels Strahlbildungsalgorithmen in eine bevorzugte Richtung geleitet werden kann.
  2. Dunstabzugshaube (1) nach Anspruch 1, dadurch gekennzeichnet, dass sie mindestens ein Untergestell (43) umfasst, das mit dem tragenden Gestell des Schalldämpfermoduls verbunden ist, derart, dass mindestens eine Kammer (44) gebildet wird, in der die elektroakustischen Wandler (5) eingebaut sind.
  3. Dunstabzugshaube (1) nach Anspruch 2, dadurch gekennzeichnet, dass das Untergestell (43) eine untere Wand (45) aufweist, die im Winkel (θ) größer als 0° in Bezug auf die Achse (A) der Rohrleitung geneigt ist, und die elektroakustischen Wandler (5) mit der Schallemissionsfläche (50) auf der unteren Wand (45) des Untergestells angeordnet eingebaut sind.
  4. Dunstabzugshaube (1) nach Anspruch 3, dadurch gekennzeichnet, dass das Untergestell (43) ferner eine mittlere Wand (45) parallel zur Achse (A) der Rohrleitung und eine obere Wand (47) aufweist, die in Bezug auf die Achse der Rohrleitung derart geneigt ist, dass ein sich verjüngender Einlassbereich (C1) mit abnehmenden Maßen, ein mittlerer Bereich (C2) mit gleichbleibenden Maßen und ein sich verjüngender Auslassbereich (C3) mit zunehmenden Maßen entsteht.
  5. Dunstabzugshaube (1) nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die elektroakustischen Wandler (5) Lautsprecher vom Shakertyp sind und die untere Wand (45) des Untergestells eine starre Platte ist, die vom Shaker-Lautsprecher in Vibration versetzt wird, um einen Schall zur Geräuschunterdrückung zu abgeben.
  6. Dunstabzugshaube (1) nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die elektroakustischen Wandler (5) in linearen Reihen angeordnet sind.
  7. Dunstabzugshaube (1) nach einem beliebigen der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die elektroakustischen Wandler (5) auf einer kreisförmigen Strecke, gleichwinklig voneinander beabstandet angeordnet sind.
  8. Dunstabzugshaube (1) nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sie Folgendes umfasst:
    - mindestens einen Trägheitsantrieb / Shaker (3), der mit der Steuereinheit (8) verbunden und auf einer seitlichen Wand (25) des Gehäuses (2) der Motor-Gebläse-Gruppe angeordnet ist, um die durch den Betrieb des Motors und des Gebläses verursachte Vibration der seitlichen Wand zu dämpfen,
    - mindestens einen Beschleunigungsmesser (9), der mit Steuereinheit (8) verbunden und auf einer seitlichen Wand (25) des Gehäuses (2) der Motor-Gebläse-Gruppe neben dem Trägheitsantrieb / Shaker (3) angeordnet ist, um die Beschleunigung der Vibrationen der seitlichen Wand (25) des Gehäuses (2) der Motor-Gebläse-Gruppe zu messen und den Trägheitsantrieb / Shaker (3) entsprechend der gemessenen Beschleunigung zu steuern.
  9. Dunstabzugshaube (1) nach einem beliebigen der Ansprüche 2 bis 8, dadurch gekennzeichnet, dass sie mindestens zwei Aufnahmemikrofone (6) umfasst, die an diametral gegenüberliegenden Stellungen auf den Untergestellen (43) oberhalb der elektroakustischen Wandler (5) angeordnet sind.
  10. Dunstabzugshaube (1) nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sie mindestens vier Fehlermikrofone (6) umfasst, die auf den Wänden des tragenden Gestells des Schalldämpfermoduls unterhalb der elektroakustischen Wandler (5) an diametral gegenüberliegenden Stellungen und gleichmäßig voneinander beabstandet angeordnet sind.
  11. Dunstabzugshaube (1) nach einem beliebigen der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das schalldämpfende Material (49) die gesamte Innenfläche der Rohrleitung (C) bedeckt.
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