WO2022162731A1 - Dispositif d'assourdissement - Google Patents

Dispositif d'assourdissement Download PDF

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Publication number
WO2022162731A1
WO2022162731A1 PCT/JP2021/002649 JP2021002649W WO2022162731A1 WO 2022162731 A1 WO2022162731 A1 WO 2022162731A1 JP 2021002649 W JP2021002649 W JP 2021002649W WO 2022162731 A1 WO2022162731 A1 WO 2022162731A1
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WO
WIPO (PCT)
Prior art keywords
side chamber
air
exhaust
discharge
suction
Prior art date
Application number
PCT/JP2021/002649
Other languages
English (en)
Japanese (ja)
Inventor
樹司 村上
一輝 岡本
裕司 水野
真也 加藤
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to EP21922755.0A priority Critical patent/EP4286762A4/fr
Priority to JP2022577830A priority patent/JPWO2022162731A1/ja
Priority to PCT/JP2021/002649 priority patent/WO2022162731A1/fr
Publication of WO2022162731A1 publication Critical patent/WO2022162731A1/fr

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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
    • F24F13/02—Ducting arrangements
    • 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
    • F24F13/20—Casings or covers
    • 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
    • F24F2013/242—Sound-absorbing material
    • 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 disclosure relates to a silencer that suppresses duct noise.
  • Duct blowers that supply and exhaust air through ducts are widely used for ventilation purposes.
  • the draft noise flowing through the duct may be uncomfortable, and noise reduction is required.
  • a silencer having a sound absorbing material is used together with a duct blower.
  • the muffler is either connected in the middle of the duct or attached directly to the duct blower.
  • Patent Literature 1 discloses a composite muffler that muffles the suction side and the discharge side of each of supply air and exhaust air. A composite muffler is more expensive than a single-tube muffler that muffles only one duct, but is easier to install than a single-tube muffler installed in each of a plurality of ducts. is.
  • a composite silencer is larger in size than a single-tube silencer because it integrates multiple air passages and silencers that silence each air passage. For this reason, there is a problem that it is difficult to secure an installation space for a composite muffler capable of preventing noise from being transmitted indoors or outdoors.
  • the present disclosure has been made in view of the above, and aims to obtain a noise suppressor that is a composite type, can suppress an increase in device size, and can prevent noise from being transmitted indoors or outdoors.
  • the muffler according to the present disclosure is a muffler connected to a ventilation device that supplies and exhausts air, and includes a rectangular box-shaped housing and a housing installed in the housing.
  • a supply air suction side chamber connected to the air supply side suction air passage of the ventilation device, a supply air discharge side chamber connected to the air supply side discharge air passage of the ventilation device, and an air supply side discharge side chamber connected to the ventilation device and an air passage component forming an exhaust suction side chamber connected to the suction air passage of the ventilator and an exhaust discharge side chamber connected to the exhaust side discharge air passage of the ventilator.
  • the volume of the portion of the air passage forming member that forms the supply air discharge side chamber is larger than the volume of the portion of the air passage forming member that forms the air supply suction side chamber.
  • the volume of the portion of the air passage forming member that forms the exhaust discharge side chamber is larger than the volume of the portion of the air passage forming member that forms the exhaust suction side chamber.
  • the blower apparatus according to the present disclosure is a composite type, and has the effect of being able to suppress an increase in the size of the apparatus and to prevent noise from being transmitted indoors or outdoors.
  • FIG. 1 is a perspective view of a silencer according to Embodiment 1 1 is a perspective view of a duct blower to which a noise suppressor according to Embodiment 1 is attached;
  • FIG. FIG. 3 is a diagram showing an assembled state of the noise suppressing device and the duct blower according to the first embodiment;
  • Sectional view of the silencer according to Embodiment 1 Sectional view of the silencer according to Embodiment 1
  • Cross-sectional view of a silencer according to Embodiment 2 Cross-sectional view of a silencer according to Embodiment 3
  • FIG. 1 is a perspective view of a silencer according to Embodiment 1.
  • FIG. The muffler 2 includes a rectangular parallelepiped box-shaped housing 8 .
  • a discharge port 3a and a suction port 3b are provided on a first surface 8a of the housing 8 and a second surface 8b facing the first surface 8a.
  • the first surface 8a and the second surface 8b may be the upper surface and the lower surface of the housing 8, or may be two opposite side surfaces of the housing 8. As shown in FIG.
  • FIG. 2 is a perspective view of a duct blower to which the silencer according to Embodiment 1 is attached.
  • the white arrows in FIG. 2 represent the flow of air.
  • the duct blower 1 has a supply air inlet 1a, a supply air outlet 1b, an exhaust air inlet 1c, and an exhaust air outlet 1d provided on one surface.
  • the air sucked from the air supply suction port 1a is discharged from the air supply discharge port 1b.
  • the air sucked from the exhaust suction port 1c is discharged from the exhaust discharge port 1d.
  • FIG. 3 is a diagram showing how the silencer according to Embodiment 1 and the duct blower are assembled.
  • a muffler 2 according to Embodiment 1 is directly connected to a duct blower 1, which is a ventilation device for air supply and exhaust.
  • the noise suppressing device 2 is connected to the duct fan 1 , the first surface 8 a contacts the housing of the duct fan 1 .
  • a supply air intake duct, a supply air discharge duct, an exhaust air intake duct, and an exhaust air discharge duct (not shown) are connected to the discharge port 3a and the suction port 3b formed on the second surface 8b.
  • the supply air intake duct is a duct for taking in outside air from the outdoors, and forms an intake air passage on the supply side.
  • the air supply/discharge duct is a duct for supplying air into the room, and constitutes a discharge air passage on the supply side.
  • the exhaust intake duct is a duct for taking in room air, and forms an intake air passage on the exhaust side.
  • the exhaust discharge duct is a duct for discharging air to the outside, and constitutes a discharge air passage on the exhaust side.
  • the silencer 2 attenuates the noise generated in the duct blower 1 and suppresses the transmission of the noise indoors or outdoors through the supply air intake duct, the supply air discharge duct, the exhaust air intake duct, and the exhaust air discharge duct.
  • FIG. 4 and 5 are cross-sectional views of the silencer according to Embodiment 1.
  • FIG. FIG. 4 shows a cross section of the silencer 2 along line IV-IV in FIG.
  • FIG. 5 shows a cross section of the silencer 2 along line VV in FIG.
  • FIG. 5 shows a cross section passing through the air supply discharge side chamber 5a and the air supply suction side chamber 5b
  • a cross section passing through the exhaust discharge side chamber 5c and the exhaust suction side chamber 5d has the same cross section structure.
  • the inside of the housing 8 is partitioned into four chambers 9a, 9b, 9c, and 9d by the partition plate 4. As shown in FIG.
  • the housing 8 has a supply air discharge side chamber 5a, a supply air suction side chamber 5b, an exhaust discharge side chamber 5c, and an exhaust suction side chamber 5c. 5d is formed.
  • the supply air suction side chamber 5b and the exhaust air suction side chamber 5d are provided with a discharge port 3a on the first surface 8a and a suction port 3b on the second surface 8b.
  • the air supply discharge side chamber 5a and the exhaust discharge side chamber 5c are provided with the suction port 3b on the first surface 8a and the discharge port 3a on the second surface 8b.
  • the volume of the room 9a in which the supply air discharge side chamber 5a is formed is larger than the volume of the room 9b in which the supply air suction side chamber 5b is formed. Further, the volume of the room 9c in which the exhaust discharge side chamber 5c is formed is larger than the volume of the room 9d in which the exhaust suction side chamber 5d is formed.
  • suction port 3b and the discharge port 3a of the air supply discharge side chamber 5a and the exhaust discharge side chamber 5c have different positions in a plane parallel to the first surface 8a and the second surface 8b.
  • suction port 3b and the discharge port 3a of the supply air suction side chamber 5b and the exhaust suction side chamber 5d have the same position in a plane parallel to the first plane 8a and the second plane 8b.
  • a supply air intake duct leading to the outdoors is connected to the intake port 3b of the supply air intake side chamber 5b.
  • An exhaust discharge duct leading to the outside is connected to the discharge port 3a of the exhaust discharge side chamber 5c.
  • An air supply discharge duct leading to the interior of the room is connected to the discharge port 3a of the air supply discharge side chamber 5a.
  • An exhaust air intake duct leading to the inside of the room is connected to the intake port 3b of the exhaust air intake side chamber 5d.
  • the muffler 2 is a composite muffler that muffles a plurality of ducts.
  • the discharge port 3a and the suction port 3b of each of the supply air discharge side chamber 5a, the supply air suction side chamber 5b, the exhaust discharge side chamber 5c and the exhaust suction side chamber 5d have the same air passage area.
  • the air passage component 6 includes a first sound deadening material 6a forming the supply air discharge side chamber 5a and the exhaust discharge side chamber 5c, and a second sound deadening material forming the supply air intake side chamber 5b and the exhaust air intake side chamber 5d. 6b.
  • the first sound-absorbing material 6a is a porous sound-absorbing material
  • the second sound-absorbing material 6b is plastic foam.
  • the second sound absorbing material 6b may be a porous sound absorbing material.
  • the air supply discharge side chamber 5a is formed in the air passage component 6.
  • the volume of the portion forming the supply air suction side chamber 5b of the air passage component 6 is larger than the volume of the portion.
  • the volume of the room 9c in which the exhaust discharge side chamber 5c is formed is larger than the volume of the room 9d in which the exhaust suction side chamber 5d is formed.
  • the volume of the portion forming the exhaust suction side chamber 5d of the air passage component 6 is larger than the volume of the portion forming the exhaust suction side chamber 5d.
  • the outlet 3a and inlet 3b of the supply air discharge side chamber 5a, the supply air suction side chamber 5b, the exhaust discharge side chamber 5c, and the exhaust suction side chamber 5d have the same air passage area, (Vc/S)>(Vd/S), where Vc is the volume of the room 9d, Vd is the volume of the room 9d, and S is the air passage area of the discharge port 3a and the suction port 3b. Therefore, the noise reduction performance in the exhaust discharge side chamber 5c is higher than the noise reduction performance in the exhaust suction side chamber 5d.
  • the volume of the portion of the air passage forming member 6 forming the air supply discharge side chamber 5a is the same as the volume of the air passage forming member 6 forming the air supply suction side chamber 5b,
  • the volume of at least one of the portion forming the side chamber 5c and the portion of the air passage forming member 6 forming the exhaust suction side chamber 5d is larger than the volume thereof. That is, the volume of the portion of the air passage forming member 6 that forms the air supply discharge side chamber 5a is not the smallest compared to the volume of the portion of the air passage forming member 6 that forms the other chambers.
  • the noise generated by the duct blower 1 will cause the air to be supplied. Although the noise tends to be transmitted into the room through the discharge side chamber 5a, such a phenomenon is suppressed in the noise suppressor 2 according to the first embodiment.
  • the suction port 3b and the discharge port 3a of the air supply discharge side chamber 5a and the exhaust discharge side chamber 5c are located at different positions in a plane parallel to the first surface 8a and the second surface 8b,
  • the noise generated by the duct blower 1 is less likely to pass through the supply air discharge side chamber 5a or the exhaust air discharge side chamber 5c. That is, the noise generated by the duct blower 1 is likely to be attenuated in the supply air discharge side chamber 5a or the exhaust air discharge side chamber 5c.
  • the air supply discharge side chamber 5a and the exhaust discharge side chamber 5c have straight air paths between the suction port 3b and the discharge port 3a. Since the air passage between the suction port 3b and the discharge port 3a of the air supply discharge side chamber 5a or the exhaust discharge side chamber 5c is straight, it is arranged in the chambers 9a and 9c separated by the partition plate 4. By increasing the amount of the first sound deadening material 6a, it is possible to improve the sound deadening performance, suppress rapid expansion and rapid contraction of the air passage area, and reduce the pressure loss in the air passage in the chamber.
  • the cross-sectional area of the air passage between the suction port 3b and the discharge port 3a is constant.
  • the supply air suction side chamber 5b and the exhaust air suction side chamber 5d are located in the chambers 9b and 9d separated by the partition plate 4 because the cross-sectional area of the air passage between the suction port 3b and the discharge port 3a is constant. It is possible to increase the amount of the second sound deadening material 6b arranged in the chamber, improve the sound deadening performance, suppress the rapid expansion and rapid contraction of the air passage area, and reduce the pressure loss in the air passage in the chamber. can.
  • the air passage component 6 is arranged at least in the room 9a in which the air supply discharge side chamber 5a is formed and the room 9c in which the exhaust discharge side chamber 5c is formed.
  • the noise reduction device 2 includes an air supply discharge side chamber 5a located downstream of the duct blower 1, which is a noise source, in the air passage forming member 6 in the direction of the air flow generated by the duct blower 1. is larger than the volume of the portion forming the supply air intake side chamber 5b upstream of the duct blower 1 in the air passage constituting member 6, so that the noise traveling direction is the direction of the airflow.
  • the silencing property of the air supply discharge side chamber 5a which is in the same direction as that can be improved.
  • the portion forming the exhaust discharge side chamber 5c which is downstream of the duct blower 1, which is the noise source, of the air passage forming member 6. Since the volume is larger than the volume of the portion forming the exhaust suction side chamber 5d upstream of the duct blower 1 in the air passage component 6, the direction of noise travels in the same direction as the direction of the airflow.
  • the silencing property of the ejection side chamber 5c can be enhanced.
  • the air passage components 6 of all the rooms 9a, 9b, 9c, and 9d are of the same size, noise is prevented from being transmitted indoors or outdoors from the air supply discharge side chamber 5a and the exhaust discharge side chamber 5c.
  • the supply air intake side chamber 5b and the exhaust air intake side chamber 5d have excessive noise reduction performance, and the size of the housing 8 is increased more than necessary.
  • the supply air discharge side chamber 5a and the exhaust discharge side chamber 5c are provided with the same silencing performance as that for preventing noise from being transmitted from the supply air suction side chamber 5b and the exhaust suction side chamber 5d to the inside or outside, Noise is transmitted indoors or outdoors due to lack of silencing performance.
  • the volume of the portion forming the chamber on the discharge side downstream of the duct blower 1, which is the noise source, in the airflow direction in the airflow direction is Since the volume of the part forming the chamber on the suction side upstream of the duct blower 1 is larger than the volume of the passage forming member 6, the air passage forming members 6 of all the rooms 9a, 9b, 9c, and 9d have the same size. As compared with the case where it is arranged side by side, an increase in device size can be suppressed, and noise can be prevented from being transmitted indoors or outdoors.
  • the silencer 2 has a suction side and a discharge chamber for only one of the air supply and the exhaust.
  • Configurations with side chambers are also possible. That is, the muffler 2 can be configured to include at least one chamber on the suction side and one chamber on the discharge side.
  • FIG. 6 is a cross-sectional view of a silencer according to Embodiment 2.
  • FIG. The muffler 2 according to the second embodiment is similar to the muffler according to the first embodiment in that the air passage component 6 is arranged with a constant thickness on the inner walls of the supply air discharge side chamber 5a and the exhaust discharge side chamber 5c. It differs from device 2. Other parts are the same as those of the muffler 2 according to Embodiment 1, and redundant description will be omitted.
  • the silencer 2 according to the second embodiment similarly to the silencer 2 according to the first embodiment, when compared with the case where the air passage constituent members 6 of all the rooms 9a, 9b, 9c, and 9d have the same size, An increase in device size can be suppressed, and noise can be prevented from being transmitted indoors or outdoors.
  • FIG. 7 is a cross-sectional view of a silencer according to Embodiment 3.
  • FIG. The muffler 2 according to Embodiment 3 differs from Embodiment 1 in that the perforated plate 7 is arranged on the surface of the air passage component 6 in the air supply discharge side chamber 5a and the exhaust discharge side chamber 5c. It is different from the muffler 2 according to Other parts are the same as those of the muffler 2 according to the first embodiment, and redundant description will be omitted.
  • the perforated plate 7 is a resonator-type sound absorbing material in which a plurality of holes are formed at regular intervals.
  • the perforated plate 7 dissipates sound of a specific frequency determined by the diameter of the perforations.
  • the muffler 2 according to the third embodiment can make the muffling effect for the sound of a specific frequency determined by the diameter of the hole of the perforated plate 7 higher than that of the muffler 2 according to the first embodiment.
  • the configuration shown in the above embodiment shows an example of the contents, and it is possible to combine it with another known technique, and part of the configuration is omitted or changed without departing from the scope. is also possible.
  • 1 duct blower 1a supply air inlet, 1b air supply outlet, 1c exhaust air inlet, 1d exhaust outlet, 3a outlet, 3b air inlet, 2 silencer, 4 partition plate, 5a air supply discharge side chamber, 5b Air supply suction side chamber, 5c Exhaust discharge side chamber, 5d Exhaust suction side chamber, 6 Air passage component, 6a First sound deadening material, 6b Second sound deadening material, 7 Plate with holes, 8 Housing, 8a Second 1st side, 8b Second side, 9a, 9b, 9c, 9d Room.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Duct Arrangements (AREA)

Abstract

La présente invention concerne un dispositif d'assourdissement (2) raccordé à une soufflante de conduit qui fournit et évacue de l'air, ledit dispositif d'assourdissement comprenant : un logement en forme de boîte parallélépipédique rectangulaire (8) ; et un composant de trajet d'air (6) qui est installé dans le logement (8) et forme, dans le logement (8), une chambre côté aspiration d'air d'alimentation (5b) raccordée à un trajet d'air d'aspiration sur le côté alimentation en air de la soufflante de conduit, une chambre côté évacuation d'air d'alimentation (5a) raccordée à un trajet d'air d'évacuation sur le côté alimentation en air de la soufflante de conduit, une chambre côté aspiration d'air d'évacuation (5d) raccordée à un trajet d'air d'aspiration sur le côté évacuation de la soufflante de conduit, et une chambre côté évacuation d'air d'évacuation (5c) raccordée à un trajet d'air d'évacuation sur le côté évacuation de la soufflante de conduit. Le volume de la partie du composant de trajet d'air (6) qui forme la chambre côté évacuation d'air d'alimentation (5a) est plus grand que le volume de la partie du composant de trajet d'air (6) qui forme la chambre côté aspiration d'air d'alimentation (5b). Le volume de la partie du composant de trajet d'air (6) qui forme la chambre côté évacuation d'air d'évacuation (5c) est plus grand que le volume de la partie du composant de trajet d'air (6) qui forme la chambre côté aspiration d'air d'évacuation (5d).
PCT/JP2021/002649 2021-01-26 2021-01-26 Dispositif d'assourdissement WO2022162731A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP21922755.0A EP4286762A4 (fr) 2021-01-26 2021-01-26 Dispositif d'assourdissement
JP2022577830A JPWO2022162731A1 (fr) 2021-01-26 2021-01-26
PCT/JP2021/002649 WO2022162731A1 (fr) 2021-01-26 2021-01-26 Dispositif d'assourdissement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/002649 WO2022162731A1 (fr) 2021-01-26 2021-01-26 Dispositif d'assourdissement

Publications (1)

Publication Number Publication Date
WO2022162731A1 true WO2022162731A1 (fr) 2022-08-04

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PCT/JP2021/002649 WO2022162731A1 (fr) 2021-01-26 2021-01-26 Dispositif d'assourdissement

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EP (1) EP4286762A4 (fr)
JP (1) JPWO2022162731A1 (fr)
WO (1) WO2022162731A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6416545U (fr) * 1987-07-21 1989-01-27
JPH03263537A (ja) * 1990-03-14 1991-11-25 Daikin Ind Ltd 熱交換換気装置
JPH0526492A (ja) * 1991-07-19 1993-02-02 Mitsubishi Electric Corp 空気調和機
JP2002089228A (ja) * 2000-09-08 2002-03-27 Masakatsu Hayashizaki 襞状騒音分離型消音器
EP2306108A1 (fr) * 2009-09-25 2011-04-06 Hans Östberg Agencement de ventilation
EP2642215A1 (fr) 2012-03-19 2013-09-25 NuAire Limited Atténuateur acoustique pour unité de ventilation
WO2015033215A1 (fr) * 2013-09-06 2015-03-12 Zehnder Group International Ag Amortisseur de son pour unité de ventilation à récupération de chaleur
EP3543622A1 (fr) * 2018-03-21 2019-09-25 Hoval Aktiengesellschaft Dispositif d'isolation sonore et système de ventilation doté d'un tel dispositif d'isolation sonore

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3042131B1 (fr) * 2013-09-06 2020-06-03 Zehnder Group International AG Unité de silencieux pour unité de ventilation à récupération de chaleur
DE102018003956A1 (de) * 2018-05-16 2019-11-21 Stiebel Eltron Gmbh & Co. Kg Lüftungsgerät mit Schalldämpferaufsatz

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6416545U (fr) * 1987-07-21 1989-01-27
JPH03263537A (ja) * 1990-03-14 1991-11-25 Daikin Ind Ltd 熱交換換気装置
JPH0526492A (ja) * 1991-07-19 1993-02-02 Mitsubishi Electric Corp 空気調和機
JP2002089228A (ja) * 2000-09-08 2002-03-27 Masakatsu Hayashizaki 襞状騒音分離型消音器
EP2306108A1 (fr) * 2009-09-25 2011-04-06 Hans Östberg Agencement de ventilation
EP2642215A1 (fr) 2012-03-19 2013-09-25 NuAire Limited Atténuateur acoustique pour unité de ventilation
WO2015033215A1 (fr) * 2013-09-06 2015-03-12 Zehnder Group International Ag Amortisseur de son pour unité de ventilation à récupération de chaleur
EP3543622A1 (fr) * 2018-03-21 2019-09-25 Hoval Aktiengesellschaft Dispositif d'isolation sonore et système de ventilation doté d'un tel dispositif d'isolation sonore

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4286762A4

Also Published As

Publication number Publication date
EP4286762A4 (fr) 2024-03-06
EP4286762A1 (fr) 2023-12-06
JPWO2022162731A1 (fr) 2022-08-04

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