EP3927976B1 - Vorrichtung zur reduzierung von lüftergeräuschen - Google Patents

Vorrichtung zur reduzierung von lüftergeräuschen Download PDF

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Publication number
EP3927976B1
EP3927976B1 EP20704882.8A EP20704882A EP3927976B1 EP 3927976 B1 EP3927976 B1 EP 3927976B1 EP 20704882 A EP20704882 A EP 20704882A EP 3927976 B1 EP3927976 B1 EP 3927976B1
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EP
European Patent Office
Prior art keywords
grid elements
fan
substantially circular
generated noise
inner cavity
Prior art date
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Active
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EP20704882.8A
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English (en)
French (fr)
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EP3927976A1 (de
Inventor
Luca D'ALESSANDRO
Stefano CAVERNI
Giovanni CAPELLARI
Sebastiano Conti
Francesco Mori
Simone MEDURI
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Phononic Vibes Srl
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Phononic Vibes Srl
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Publication of EP3927976A1 publication Critical patent/EP3927976A1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/665—Sound attenuation by means of resonance chambers or interference
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • 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
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Definitions

  • the present invention relates to a device for reducing fan-generated noise.
  • the present invention finds application in the fields of ventilation, air conditioning, de-humidification, cooling or heating, and in any technical field where fans are present.
  • Fans namely axial pumps for air circulation, are noise sources when in operation. Indeed, a fan in rotation propagates an acoustic field, inter alia due to the interaction of the fan blades with the air and to engine noise, typically an electric motor, used to put the fan in rotation.
  • CA2555710 (A1) relates to a silencer for a passage, having soft acoustic sections and non-soft acoustic sections alternately arranged on the inner wall of the passage, in the length direction.
  • the soft acoustic section is composed of an acoustic pipe array for duct walls, formed in a rectangular plate shape by arranging 1/4 wavelength acoustic pipes having a rectangular cross-sectional shape with one closed end and another opened end in parallel along the duct wall in a perpendicular direction.
  • the openings of the acoustic pipe are alternately closed by rigid bodies such as aluminum plates.
  • US 2013/206500 A1 discloses another device for reducing noise belonging to the background art of the claimed invention.
  • An object of the present invention is to overcome drawbacks of the prior art.
  • a particular object of the present invention is to limit the propagation of an acoustic field generated by a fan more effectively.
  • a further particular object of the present invention is to provide a device that is effectively associated with a fan, for reducing the noise perceived by a receiver.
  • a further particular object of the present invention is to provide a device for reducing a fan-generated noise having a compact and robust construction.
  • An idea underlying the present invention is to provide a device for reducing fan-generated noise, comprising: a plurality of grid elements identifying a main development plane, and empty portions delimited by the grid elements and configured for the passage of an air flow through the device; each of the grid elements comprises a respective inner cavity delimited by side walls that define at least one tube opening facing a respective one of the empty portions and substantially orthogonal to the main development plane; the inner cavity is acoustic resonant, so as to reduce the noise generated by the fan.
  • the device has a substantially circular overall shape having a substantially circular outer edge, wherein first grid elements of the grid elements have their main direction of development aligned to the outer edge and are tangentially arranged and aligned with each other on concentric circumferences in the substantially circular overall shape.
  • the inner cavity of the grid elements being resonant, contributes limiting the propagation of the acoustic waves generated by the fan which the device is associated with.
  • the noise-reduction effect is very high since all of the grid elements contribute to it synergistically.
  • the device has limited dimensions, meanwhile allowing the passage of an air flow passing through it, thus being effective when associated with a fan, in particular constituting a grid covering element thereof.
  • the device has a substantially circular overall shape which more effectively matches the shape of the fan having an impeller in (circular) rotation.
  • the grid elements and their inner cavities are aligned on concentric circumferences, it becomes possible to optimize the acoustic performance of the device, in terms of noise reduction, for a same occupied area of air flow.
  • the device of the present invention is better suited to match and operate in connection with a fan, in order to effectively reduce fan-generated noise.
  • the grid device of the present invention allows reducing disturbances to passage of an air flow, meanwhile attenuating the passage of a sound field.
  • the device of the present invention allows to minimize an obstructed area for the air flow.
  • the grid elements delimit larger empty portions in a central zone of the substantially circular overall shape of the device, to leave as undisturbed as possible the air flow in the central zone.
  • the air flow is notoriously defined by helicoidal trajectories; air streams include velocity vectors having a component perpendicular to the fan's plane and a further circumferential component belonging to planes which are parallel to the fan's plane.
  • the device of the present invention allows to reduce disturbances by providing air passage according to a more aerodynamic characteristic, thus reducing turbulence downstream of the device and at the same time maintaining optimal characteristics for noise reduction.
  • the plurality of grid elements adjoined to each other contributes constituting a robust and practical device, particularly suitable for industrial or domestic uses.
  • the grid elements have curved bodies shaped as circumference arcs which are tangentially arranged with a staggered configuration, to provide a radial contact interface between grid elements of difference circumferences. Therefore, advantageously, an improved bearing structure of the device is provided.
  • the side walls define a tube opening while an end wall of the side walls, opposite the one tube opening, is closed.
  • the device of the present invention achieves better compactness for a same number of tube openings involved.
  • two grid elements adjacent to each other are adjoined at respective end walls, defining a closure between two respective inner cavities; more preferably the two inner cavities of two axially adjacent grid elements, are of equal length with each other.
  • the device according to the present invention is configured for being arranged with its main development plane, orthogonal to a una main propagation direction of the fan-generated noise.
  • the inner cavity develops along the main development plane of the device; it is also possible that the inner cavity further develops outside the main development plane, with grid elements that are also curved in space.
  • the first grid elements comprise at least a first group of inner first grid elements closer to a center of the substantially circular overall shape, and further comprise at least a second group of outer first grid elements closer to the substantially circular outer edge.
  • the first group and the second group of grid elements provide different acoustic resonant inner cavities, so as to reduce a wider frequency spectrum of fan-generated noise.
  • acoustic resonant inner cavities having different lengths are employed in the (inner) first group and in the (outer) second group, so as to provide acoustic resonators active on distributed frequencies, thus improving the noise-dampening capability of the device.
  • second grid elements having their main development direction that is radially to the substantially circular outer edge may also be present, namely arranged radially in the substantially circular overall shape of the device.
  • These second grid elements advantageously, comprise a respective inner cavity for reducing the fan-generated noise, and at the same time provide a radial frame for all the other first grid elements of the device, thus improving structural stability of its bearing structure.
  • one or more of the side walls of the inner cavity may comprise one or more holes or slits, configured for increasing an acoustic field damping and for increasing the noise-reduction effectiveness.
  • the device according to the present invention makes a self-bearing structure that is associable with an opening of a fan casing or with a duct, in fluidic connection with one or more fans.
  • the grid elements are further configured for preventing the accidental access to the fan by a user's hand, tools or anything else, thus increasing the safety of the overall apparatus.
  • Figure 1 illustrates a device 10 for reducing fan-generated noise according to the present invention.
  • the device 10 is associated with a fan 11 that is a source of noise propagating as schematized.
  • the device 10 may also be associated with more than one fan.
  • the device 10 is intended to limit the propagation of the acoustic field 12 generated by the fan 11 towards an outer receiver; therefore, the device 10 has remarkable validity in industrial and/or domestic applications.
  • the device 10 according to the present invention is configured for being arranged with its main development plane that is orthogonal to a main propagation direction of the noise generated by the fan 11.
  • the device 10 is configured for being associated with an opening of a fan casing or with a duct 13, in fluidic connection with the fan 11, being preferably transversally positioned in said opening or duct 13.
  • Figure 2 illustrates a first embodiment 101 of a device 10 for reducing fan-generated noise according to the present invention.
  • analogous elements for instance, grid elements, empty portions, side walls, cavities, etc.
  • reference number for greater clarity
  • the other analogous elements though not indicated by a specific reference number, will have to be intended as recomprised by analogy.
  • the device 101 comprises a plurality of grid elements 201 connected to each other, which will be further described. Said grid elements 201 are configured for constituting a bearing structure of the device 101.
  • the device 101 then comprises empty portions 202 delimited by the grid elements 201, which are configured for the passage of an air flow through the device 101.
  • the empty portions 202 have dimensions that are relatively greater towards the center of the device, for increasing said air flow, with respect to the dimensions towards the periphery of the device.
  • the grid elements 201 are further configured as a safety for preventing accidental access to the fan 11, by an operator's hand, or tools or anything else.
  • the device 10 has an overall substantially circular shape 101, having a substantially circular outer edge 203.
  • substantially circular will refer to any shape associated to the device 10, which may be a circular shape or may also be a shape which closely resembles the circular one.
  • substantially circular shape examples include, for instance: circular, elliptical, or polygonal having a large number of sides (i.e. five or more sides), either regular or irregular based on size requirements or even on aesthetic considerations.
  • Figure 3 illustrates the grid elements 201 of the device 101.
  • the grid elements 201 identify a main development plane of the device 101, namely the plane whereon the device 10 is placed predominantly, intuitively the transversal plane that is coincident with the view in Figure 3 .
  • Each of the grid elements 201 comprises a respective inner cavity delimited by side walls, which will be further described. Indeed, in order to define the noise-reduction property and to trigger the sound-absorption mechanism, the grid elements 201 provide inner cavities each having at least one respective opening, in particular located in the division perimeter between the areas filled in by the grid elements 201 and the above-described empty portions 202.
  • the grid elements 201 essentially constitute tubes acting as acoustic resonant cavities and thus sound-absorbing.
  • the delimitation of these tubes is represented not only by the two sets of inner and outer surfaces of the grid elements 201, but also by the division perimeter with the already described open portions 202.
  • the grid elements 201 may be tubes that are open on both ends, namely tubes comprising two respective openings that are opposite each other.
  • the grid elements 201 may also be tubes open on one end, namely tubes comprising only one respective opening.
  • the tubes represented by the grid elements 201 act as acoustic resonant cavities, having the one or more openings that are substantially orthogonal to the main development plane of the device 10, namely substantially aligned to the predominant direction of an air flow passing through the device 10.
  • First grid elements 201 of all the grid elements of the device 10 have their main direction of development which is aligned to the outer edge 203.
  • the first grid elements 201 are tangentially arranged and aligned with each other, on concentric circumferences, in the substantially circular overall shape 101.
  • the grid elements 201 have curved bodies shaped as circumference arcs, and are tangentially arranged with a staggered configuration, to provide a radial contact interface between radially adjacent grid elements 201 of different concentric circumferences.
  • the grid elements 201 delimit larger empty portions 202 in a central zone of the substantially circular overall shape 101.
  • Figure 4 illustrates a three-dimensional view of the grid elements 201 of Figure 3 .
  • each of the grid elements 201 define a tube opening 401, facing one respective of the empty portions 202 and substantially orthogonal to the main development plane of the device 10.
  • the tube opening 401 When hit by a flow passing through the device 10, the tube opening 401 is substantially parallel to the flow direction and the cavity of each tube element is at least partially lying on a plane that is perpendicular to the flow direction.
  • the inner cavity of the grid elements 201 is thus acoustic resonant, and adapted to reduce the fan-generated noise, by an acoustic damping effect.
  • the inner cavity of the grid elements 201 develops along the main development plane of the device 10.
  • the grid elements 201 may comprise two respective tube openings 401, opposite each other, on ends of the grid element 201 which form an open-tube cavity.
  • the device of the present invention is particularly suitable for reducing particular frequencies of a sound field, based on the dimensional characteristics of the inner cavities, which may be defined in the design phase.
  • the device of the present invention is thus particularly effective in case of fan-generated noise, which has certain tonal characteristics given by the dimensional and operating parameters of the impeller.
  • Figure 5 illustrates a cut-through part of the grid elements 201 of Figure 4 .
  • the two inner cavities 501 of the grid elements 201 adjoined at the respective end walls 502 are of equal length with each other.
  • said equivalent tube preferably has an intermediate closure, at its middle section.
  • the inner cavity of the grid elements may further develop in space, namely outside the main development plane of the device 10; indeed, the determining characteristic for the resonant properties is essentially the length of the inner cavity, whereas its arrangement in space or trajectory may further be modified based on design criteria.
  • Figure 6 illustrates the grid elements of a second embodiment 102 of a device 10 for reducing fan-generated noise according to the present invention.
  • the device 10 has an overall circular shape.
  • the first grid elements 201 are tangentially arranged and aligned with each other on concentric circumferences in the overall shape.
  • first grid elements 201 of all the grid elements of the device 10 have their main direction of development which is aligned to the outer edge 203.
  • the first grid elements 201 are tangentially arranged and aligned with each other, on concentric circumferences, in the substantially circular overall shape 102.
  • Figure 7 illustrates a side view of the grid elements 201 of Figure 6 .
  • said grid elements 201 are mechanically connected to each other, and thus configured for constituting a bearing structure of the device 101, in particular having a three-dimensional development in space of the 'pyramid' type.
  • the main development plane of the device 10 is definable as a plane transversal to the view of Figure 7 , namely parallel to the view of Figure 6 .
  • Figure 8 illustrates a cut-through part of the grid elements of Figure 6 , in a three-dimensional view.
  • Figure 9 illustrates a third embodiment 103 of a device 10 for reducing fan-generated noise according to the present invention.
  • the device 10 comprises a plurality of grid elements 201 connected to each other and empty portions 202 delimited by the grid elements 201, which are configured for the passage of an air flow through the device 103.
  • the grid elements 201 delimit larger empty portions 202 in a central zone of the substantially circular overall shape 103, 104.
  • the device 10 comprises a central empty portion 901, configured for maximizing the air flow.
  • Figure 10 illustrates the grid elements 201 of the device of Figure 9 .
  • the device 103 comprises second grid elements 902 having their main development direction radially to an outer edge of the overall shape of the device 10, in particular being radially arranged in the circular overall shape 103.
  • the second grid elements 902 further provide a radial frame within the substantially circular overall shape 103, so as to improve structural stability of a bearing structure of the device 10.
  • the grid elements 201 comprise at least a first group of inner first grid elements 911, which are closer to a center of the substantially circular overall shape 103.
  • the grid elements 201 further comprise at least a second group of outer first grid elements 913, closer to the substantially circular outer edge 203.
  • the first group of inner first grid elements 911 comprise inner cavities which are of shorter length 912 than a length 914 of inner cavities of the second group of outer first grid elements 913.
  • the first group 911 and the second group 913 of grid elements provide different acoustic resonant inner cavities, so as to reduce a wider frequency spectrum of fan-generated noise.
  • a larger number of groups, i.e. three or more groups, of grid elements may be preferably provided, each having grid elements with cavities of different lengths so as to reduce a wider frequency spectrum of fan-generated noise.
  • Figure 11 illustrates a cut-through part of the grid elements of Figure 10 , in a three-dimensional view.
  • the second grid elements 902 preferably comprise an inner cavity 903 having a tube opening 401, facing one respective of the empty portions 202 and substantially orthogonal to the main development plane of the device 10, and further comprise an end wall 502 between the side walls of the grid elements 201, which is opposite the tube opening 401, and is closed.
  • the inner cavity 903 is acoustic resonant for further reducing the fan-generated noise.
  • Figure 12 illustrates the grid elements of a fourth embodiment 104 of a device 10 for reducing fan-generated noise according to the present invention.
  • At least one of the side walls of the inner cavity, preferably one or both side walls parallel to the main development plane comprise one or more holes or slits 1201.
  • Said holes or slits 1201 are configured for increasing an acoustic field damping, thus increasing the reduction effectiveness of the fan-generated noise.
  • the distribution density of said holes or slits 1201 increases for grid elements that are closer to the center of said device, so as to have a greater number of holes or slits in areas where an air flow has locally higher speeds.
  • both the surface of the grid elements facing the fan and the opposite one, or any surface that may be inserted between these two surfaces without compromising the sound-absorption mechanism may be equipped with holes or slits, so as to increase the acoustic filed damping and thus the sound-absorption property of the grid.
  • Figure 13 illustrates a cut-through part of the grid elements of Figure 12 , in a three-dimensional view.
  • the present invention allows performing an effect on the acoustic field radiated by a fan, though maintaining chances of air flow coming from the fan.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Cookers (AREA)

Claims (15)

  1. Vorrichtung (10) zur Reduzierung von Ventilator-erzeugtem Geräusch, umfassend:
    eine Vielzahl von Gitterelementen (201, 902), die eine Hauptentwicklungsebene identifizieren, und
    leere Abschnitte (202), die durch die Gitterelemente (201, 902) begrenzt und für den Durchgang eines Luftstroms durch die Vorrichtung (10) konfiguriert sind,
    wobei jedes der Gitterelemente (201, 902) jeweils einen durch Seitenwände begrenzten inneren Hohlraum (501, 903) aufweist,
    wobei die Seitenwände mindestens eine Rohröffnung (401) definieren, die jeweils einem der leeren Abschnitte (202) zugewandt und im Wesentlichen orthogonal zur Hauptentwicklungsebene ist,
    wobei der innere Hohlraum (501, 903) zur Reduzierung des Ventilator-erzeugten Geräuschs akustisch resonant ist,
    und wobei die Vorrichtung (10) eine im Wesentlichen kreisförmige Gesamtform (101, 102, 103, 104) mit einem im Wesentlichen kreisförmigen äußeren Rand (203) aufweist, wobei erste Gitterelemente (201) der Gitterelemente (201, 902) ihre Hauptentwicklungsrichtung an dem äußeren Rand (203) ausgerichtet haben,
    wobei die ersten Gitterelemente (201) tangential angeordnet und auf konzentrischen Umfängen in der im Wesentlichen kreisförmigen Gesamtform (101, 102, 103, 104) zueinander ausgerichtet sind.
  2. Vorrichtung nach Anspruch 1, wobei die Seitenwände eine Rohröffnung (401) definieren und wobei eine Stirnwand (502) der Seitenwände, die der Rohröffnung (401) gegenüberliegt, geschlossen ist.
  3. Vorrichtung nach Anspruch 2, wobei zwei nebeneinander liegende Gitterelemente (201) an den jeweiligen Stirnwänden (502) aneinandergrenzen, einen Abschluss zwischen zwei jeweiligen inneren Hohlräumen (501) bildend.
  4. Vorrichtung nach Anspruch 3, wobei die zwei inneren Hohlräume (501) der beiden nebeneinander liegenden Gitterelemente (201) gleich lang sind.
  5. Vorrichtung nach einem der Ansprüche 1 bis 4, wobei die ersten Gitterelemente (201) mindestens eine erste Gruppe von inneren ersten Gitterelementen (911) umfassen, die sich näher an einem Zentrum der im Wesentlichen kreisförmigen Gesamtform (101, 102, 103, 104) befinden, und ferner mindestens eine zweite Gruppe von äußeren ersten Gitterelementen (913) umfassen, die sich näher an dem im Wesentlichen kreisförmigen äußeren Rand (203) befinden, wobei die erste Gruppe und die zweite Gruppe innere Hohlräume, die unterschiedlich akustisch resonant sind, bereitstellen, um ein breiteres Frequenzspektrum des Ventilator-erzeugten Geräusches zu reduzieren.
  6. Vorrichtung nach Anspruch 5, wobei die erste Gruppe von inneren ersten Gitterelementen (911) innere Hohlräume aufweist, die eine kürzere Länge (912) als eine Länge (914) von inneren Hohlräumen der zweiten Gruppe von äußeren ersten Gitterelementen (913) aufweisen.
  7. Vorrichtung nach einem der Ansprüche 1 bis 6, wobei sich der innere Hohlraum (501, 903) entlang der Hauptentwicklungsebene entwickelt.
  8. Vorrichtung nach Anspruch 7, wobei sich der innere Hohlraum ferner außerhalb der Hauptentwicklungsebene im Raum entwickelt.
  9. Vorrichtung nach einem der Ansprüche 1 bis 8, wobei zweite Gitterelemente (902) der Gitterelemente (201, 902) ihre Hauptabwicklungsrichtung radial zu dem im Wesentlichen kreisförmigen äußeren Rand (203) haben, insbesondere radial in der im Wesentlichen kreisförmigen Gesamtform (103) angeordnet sind.
  10. Vorrichtung nach Anspruch 9, wobei die zweiten Gitterelemente (902) jeweils einen inneren Hohlraum (903) aufweisen, der akustisch resonant ist, um das Ventilatorerzeugte Geräusch zu reduzieren, und ferner einen radialen Rahmen innerhalb der im Wesentlichen kreisförmigen Gesamtform (103) bereitstellen, um die strukturelle Stabilität einer Tragstruktur der Vorrichtung (10) zu verbessern.
  11. Vorrichtung nach einem der Ansprüche 1 bis 10, wobei mindestens eine der Seitenwände des inneren Hohlraums (501, 903), vorzugsweise mindestens eine der Seitenwände, die parallel zu der Hauptentwicklungsebene ist, ein oder mehrere Löcher oder Schlitze (1201) aufweist, die konfiguriert sind, eine Akustikfelddämpfung des durch die Vorrichtung (10) strömenden Luftstroms zu erhöhen.
  12. Vorrichtung nach einem der Ansprüche 1 bis 11, wobei die Vorrichtung (10) geeignet ist, mit einer Öffnung eines Gehäuses eines Ventilators (11) oder mit einem Schacht (13), der in Fluidverbindung mit dem Ventilator (11) steht, verbunden zu werden, und ferner geeignet ist, mit der Hauptentwicklungsebene orthogonal zu einer Hauptausbreitungsrichtung des Ventilator-erzeugten Geräusches angeordnet zu werden.
  13. Vorrichtung nach einem der Ansprüche 1 bis 12, wobei die ersten Gitterelemente (201) miteinander verbunden sind, so dass sie eine Tragstruktur der Vorrichtung (10) bilden.
  14. Vorrichtung nach Anspruch 13, wobei die ersten Gitterelemente (201) bogenförmige Körper in Form von Kreisbögen aufweisen und tangential mit einer gestaffelten Konfiguration angeordnet sind, um eine radiale Kontaktschnittstelle zwischen Gitterelementen (201) mit unterschiedlichen konzentrischen Umfängen bereitzustellen.
  15. Vorrichtung nach einem der Ansprüche 1 bis 14, wobei die Gitterelemente (201, 902) größere der leeren Abschnitte (202) in einem zentralen Bereich der im Wesentlichen kreisförmigen Gesamtform (101, 102, 103, 104) begrenzen.
EP20704882.8A 2019-02-19 2020-02-17 Vorrichtung zur reduzierung von lüftergeräuschen Active EP3927976B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000002403A IT201900002403A1 (it) 2019-02-19 2019-02-19 Dispositivo per ridurre rumore generato da un ventilatore
PCT/EP2020/054014 WO2020169498A1 (en) 2019-02-19 2020-02-17 Device for reducing fan-generated noise

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EP3927976A1 EP3927976A1 (de) 2021-12-29
EP3927976B1 true EP3927976B1 (de) 2024-04-24

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WO2018146489A1 (en) 2017-02-09 2018-08-16 The University Of Sussex Acoustic wave manipulation by means of a time delay array

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JP3831263B2 (ja) * 2002-01-21 2006-10-11 独立行政法人科学技術振興機構 ダクト消音装置
CA2555710A1 (en) * 2004-02-13 2005-08-25 Japan Science And Technology Agency Silencer for passage
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