EP1321725A1 - Vorrichtung insbesondere zur Verringerung der von Klimaanlagen hervorgerufenen Geräuschbelastung - Google Patents

Vorrichtung insbesondere zur Verringerung der von Klimaanlagen hervorgerufenen Geräuschbelastung Download PDF

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Publication number
EP1321725A1
EP1321725A1 EP02027607A EP02027607A EP1321725A1 EP 1321725 A1 EP1321725 A1 EP 1321725A1 EP 02027607 A EP02027607 A EP 02027607A EP 02027607 A EP02027607 A EP 02027607A EP 1321725 A1 EP1321725 A1 EP 1321725A1
Authority
EP
European Patent Office
Prior art keywords
resonators
resonator
air
frequency
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02027607A
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English (en)
French (fr)
Inventor
Alberto Doria
Paolo Tarquini
Stefano Strapparava
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vertiv Srl
Original Assignee
Liebert Hiross SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Liebert Hiross SpA filed Critical Liebert Hiross SpA
Publication of EP1321725A1 publication Critical patent/EP1321725A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F24F2013/245—Means for preventing or suppressing noise using resonance

Definitions

  • the present invention relates to a device particularly for reducing the noise emitted by air conditioners.
  • the most significant source of noise is generally constituted by the fan of the air conditioner.
  • centrifugal fans whose impeller can have forward-curved blades or backward-curved blades.
  • Fans with impellers that have backward-curved blades, for example, are preferable owing to their electromechanical characteristics and their great flexibility.
  • fans with backward-curved blades have an impeller that is characterized by a very small number of blades (5-10), and accordingly the emitted noise spectrum has a peak, due to the transit of the blade, in the low-frequency range (below 500 Hz).
  • a fan with nine blades and a rotation rate of 1500 rpm has a blade frequency of 225 Hz.
  • the system Due to the impeller, the system is excited by a tonal excitation in the low-frequency range, and due to the various acoustic modes that are present in the internal cavities of the conditioner the response is high and occurs as peaks of noise in a frequency range where it is difficult to intervene with the reduction methods conventionally used.
  • Conventional devices suitable to reduce the noise emitted by conditioners generally use insulating or absorbent materials.
  • the materials used are high-density materials, which reduce the transmitted component, which varies at the various frequencies and is obviously a function of the material and of its geometric characteristics.
  • the incident sound wave is converted into thermal energy inside the structure of the sound-absorbing material.
  • the thickness between the surface of the material and the rigid support affects the absorption characteristic, which is highest for thicknesses equal to one quarter of the wavelength.
  • the absorbing materials are normally placed inside ducts arranged inside the delivery and intake circuits of conditioners.
  • Devices of this type exhibit good performance when the noise to be reduced is characterized by an acoustic spectrum with significant components for frequencies higher than 500 Hz.
  • the aim of the present invention is to provide a device particularly for reducing the noise emitted by conditioners that is particularly effective in the low-frequency range.
  • an object of the invention is to provide a device that is effective over a wide frequency range.
  • Another object is to provide a device that has a simple structure.
  • Another object is to provide a low-cost device that can be manufactured with systems and technologies of a known type.
  • a device particularly for reducing the noise emitted by air conditioners characterized in that it comprises at least one acoustic resonator, with noise reduction effectiveness over a low-frequency range, arranged at an air passage cavity located inside said air conditioner, in a region where the air flow is substantially uniform.
  • a device particularly for reducing the noise emitted by conditioners is generally designated by the reference numeral 10.
  • FIG 1 is a schematic partially sectional view of a conditioner, generally designated by the reference numeral 11, which conditioner comprises, inside a box-like container 17, a finned battery 12 for cooling air that arrives from outside.
  • the air is moved by a fan 13, flowing through cavities located inside the box-like container 17 and formed by internal walls 14 and by the walls of the box-like container 17.
  • Figure 1 further illustrates a compressor 15, which is connected to a corresponding circuit 16, which is per se known, for providing the refrigeration apparatus.
  • the device 10 comprises a plurality of acoustic resonators 18, which are arranged in mutually opposite arrays on two side walls 14a and 14b, which form a cavity 19 through which the fan 13 aspirates.
  • Each acoustic resonator 18 is of the Helmholtz type, which comprises a tubular neck 20 that has a circular cross-section and is connected to a box-like body 21 that is shaped substantially like a parallelepiped.
  • each resonator 18 can be lined internally with sound-absorbing material in order to improve its noise reduction properties.
  • the device 10 can comprise a single pair of resonators 18, arranged on two side walls 14a and 14b of the intake cavity 19 of a conditioner 11.
  • a resonator 18 acts like an equivalent mechanical system constituted by a mass and a spring with a single degree of freedom, as shown in Figure 5.
  • the fluid contained in the neck 20 behaves like a concentrated mass 23, while the fluid contained in the box-like body 21 behaves like a pneumatic spring 24.
  • the resonator 18 has a natural frequency that depends on the volume of the box-like body 21 and on the cross-section and length of the tubular neck 20.
  • the response obtained by a resonator 18 or by an array of resonators is a reduction in noise level in a narrow band that straddles the resonance band.
  • the resonator 18 is arranged conveniently in a region where the air stream is substantially uniform and is not affected by the presence of the resonator 18, with the opening 22 of the tubular neck 20 arranged parallel to the air stream.
  • the resonator 18 is sized so that its natural frequency is coupled to the frequency of the main peak of the excitation spectrum, which coincides with the blade frequency.
  • the cavity in which one or more resonators 18 are arranged have a high frequency response around the blade frequency, i.e., their resonance frequency is close to the blade frequency.
  • the device 10 has a wider frequency range over which noise reduction occurs.
  • variable-geometry resonators 18 for example with replaceable necks 20 that are flanged and fixed reversibly to the box-like body 21, with telescopic necks 20, et cetera.
  • the resonators 18 can be made of materials of various kinds and thicknesses, but so that the walls that form the internal cavity of the resonator have structural frequencies that are higher than the tuning frequencies, in order to avoid the resonance condition.
  • plastics or composite materials constituted by walls made of metal plate with interposed sound-absorbing plastic material.
  • a device has in fact been provided which is particularly effective for reducing noise emitted by conditioners.
  • the device has a simple structure and furthermore has a low cost.
  • the materials may be any according to requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
EP02027607A 2001-12-21 2002-12-11 Vorrichtung insbesondere zur Verringerung der von Klimaanlagen hervorgerufenen Geräuschbelastung Withdrawn EP1321725A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001PD000297A ITPD20010297A1 (it) 2001-12-21 2001-12-21 Dispositivo particolarmente per la riduzione del rumore emesso da condizionatori d'aria.
ITPD20010297 2001-12-21

Publications (1)

Publication Number Publication Date
EP1321725A1 true EP1321725A1 (de) 2003-06-25

Family

ID=11452496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02027607A Withdrawn EP1321725A1 (de) 2001-12-21 2002-12-11 Vorrichtung insbesondere zur Verringerung der von Klimaanlagen hervorgerufenen Geräuschbelastung

Country Status (2)

Country Link
EP (1) EP1321725A1 (de)
IT (1) ITPD20010297A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110211560A (zh) * 2019-05-31 2019-09-06 广东美的制冷设备有限公司 共振吸声结构及空调风机组件
DE102021111834A1 (de) 2021-03-04 2022-09-08 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät
WO2022228312A1 (en) * 2021-04-30 2022-11-03 Qingdao Haier Air Conditioner General Corp., Ltd. Noise reducing insert for an air conditioner unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112283809A (zh) * 2020-10-30 2021-01-29 青岛海信日立空调系统有限公司 一种室外空调器

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2176319A (en) * 1936-07-30 1939-10-17 American Blower Corp Air conditioner
US4287962A (en) * 1977-11-14 1981-09-08 Industrial Acoustics Company Packless silencer
DE4305333C1 (de) * 1993-02-20 1994-07-07 Fasag Ag Suhr Geräuschdämpfungsvorrichtung zur Reduktion von Mündungsgeräuschen bei Anlagen mit pulsierenden Gasströmungen
US5587563A (en) * 1993-06-04 1996-12-24 Dipti Kr. Datta Air handling structure for pan inlet and outlet
EP0800030A1 (de) * 1996-04-06 1997-10-08 Behr GmbH & Co. Klappe für einen Luftführungskanal
US5869792A (en) * 1995-12-04 1999-02-09 Vibron Limited Reactive acoustic silencer
US20010011007A1 (en) * 2000-01-27 2001-08-02 Salman Akhtar Column fan unit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2176319A (en) * 1936-07-30 1939-10-17 American Blower Corp Air conditioner
US4287962A (en) * 1977-11-14 1981-09-08 Industrial Acoustics Company Packless silencer
DE4305333C1 (de) * 1993-02-20 1994-07-07 Fasag Ag Suhr Geräuschdämpfungsvorrichtung zur Reduktion von Mündungsgeräuschen bei Anlagen mit pulsierenden Gasströmungen
US5587563A (en) * 1993-06-04 1996-12-24 Dipti Kr. Datta Air handling structure for pan inlet and outlet
US5869792A (en) * 1995-12-04 1999-02-09 Vibron Limited Reactive acoustic silencer
EP0800030A1 (de) * 1996-04-06 1997-10-08 Behr GmbH & Co. Klappe für einen Luftführungskanal
US20010011007A1 (en) * 2000-01-27 2001-08-02 Salman Akhtar Column fan unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110211560A (zh) * 2019-05-31 2019-09-06 广东美的制冷设备有限公司 共振吸声结构及空调风机组件
DE102021111834A1 (de) 2021-03-04 2022-09-08 Liebherr-Hausgeräte Ochsenhausen GmbH Kühl- und/oder Gefriergerät
WO2022228312A1 (en) * 2021-04-30 2022-11-03 Qingdao Haier Air Conditioner General Corp., Ltd. Noise reducing insert for an air conditioner unit

Also Published As

Publication number Publication date
ITPD20010297A1 (it) 2003-06-21

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