EP3746721A1 - An air vent - Google Patents
An air ventInfo
- Publication number
- EP3746721A1 EP3746721A1 EP19747424.0A EP19747424A EP3746721A1 EP 3746721 A1 EP3746721 A1 EP 3746721A1 EP 19747424 A EP19747424 A EP 19747424A EP 3746721 A1 EP3746721 A1 EP 3746721A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- cavity
- inlet tube
- air vent
- outlet tube
- 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.)
- Pending
Links
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
- F24F13/02—Ducting arrangements
- F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
- F24F13/062—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser having one or more bowls or cones diverging in the flow direction
-
- 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
- F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
-
- 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
- F24F7/00—Ventilation
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F2007/0025—Ventilation using vent ports in a wall
-
- 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
-
- 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
- G10K11/162—Selection of materials
Definitions
- the present invention relates to an air vent for installation in a wall of a building for directing a flow of air into a room of the building .
- At least the primary objective is achieved by means of an air vent according to claim 1 .
- the air vent comprises:
- a housing defining a cavity, wherein a sound absorbing material is arranged within the cavity;
- each of a volume of the air inlet tube and a volume of the air outlet tube are smaller than a volume of the cavity, and wherein the cavity has a larger cross-sectional area than each of the air inlet tube and the air outlet tube, such that the cavity together with the air inlet tube and the air outlet tube form a reactive silencer.
- the air vent according to the invention efficient sound attenuation is achieved thanks to that the cavity, the outlet tube and the inlet tube together form a reactive silencer, while at the same time a sound absorbing material is provided for resistive sound attenuation.
- the air vent according to the invention is particularly efficient for attenuating sound at relatively low frequencies. This renders it useful for air ventilation in buildings having an exterior exposed to noise from e.g . rail traffic and in which the requirements on sound attenuation are high.
- the air vent is also suitable for transferring air from one room of a building to another room, where there is need for sound attenuation between the rooms.
- the air vent is suitable for ventilation systems relying on natural ventilation, but the air vent may also be used in mechanical ventilation systems.
- the sound absorbing material which is arranged within the cavity provides additional sound attenuation, in particular at relatively high frequencies.
- the combination of the acoustic absorption provided by the sound absorbing material and the reactive silencing results in efficient sound attenuation over a large frequency range.
- the sound absorbing material can be provided in the form of at least one body of sound absorbing material.
- the cavity has a minimum cross- sectional area A1 and the inlet tube has a minimum cross- sectional A2, and wherein A1 >4A2. According to another embodiment, A1 >6A2.
- the cavity has a minimum cross- sectional area A1 and the outlet tube has a minimum cross- sectional A3, and wherein A1 >4A3. According to another embodiment, A1 >6A3.
- the air vent defines a reactive silencer in the frequency range 90-850Hz. Reactive sound attenuation is thus the dominating sound attenuation principle in this the above-defined frequency range.
- a reactive silencer is a silencer in which reactive attenuation of sound is an attenuation in which a part of the incident sound power towards an entrance of an inlet tube of the silencer is reflected back towards a sound source as a result of a modification of the acoustic impedance at the entrance of the inlet tube of the silencer, which is dependent on the ratio of the cross-sectional area of the cavity to the cross- sectional area of the inlet tube and the ratio of the cross-sectional area of the cavity to the cross-sectional area of the outlet tube.
- the minimum cross-sectional area A1 of the air inlet tube is 50 mm, in order to enable a predetermined air flow rate through the air without exceeding a predetermined pressure fall over the air vent.
- the distance between the inlet tube and the outlet tube should be large enough to enable spreading and reflection of sound waves inside the cavity.
- the distance between opposing ends of the air inlet tube and the air outlet tube is at least 50 mm.
- the distance between the opposing ends of the inlet tube and the outlet tube is at least 75 mm, and according to one embodiment, the distance between the opposing ends of the inlet tube and the outlet tube is at least 100 mm.
- the cavity has a length that is at least the distance between the opposing ends of the air inlet tube and the air outlet tube.
- the length of the air inlet tube is adapted to the cross-sectional area A2 of the air inlet tube and to the cross-sectional area A1 of the cavity such that reactive attenuation within the above- mentioned frequency range is achieved.
- the length of the inlet tube is at least 50 mm.
- the air vent comprises an air guiding channel for guiding the air within the cavity in a direction of flow from the air inlet tube to the air outlet tube, wherein the air guiding channel has a sound permeable outer wall.
- the air guiding channel improves the air flow through the air vent by guiding the air through the air vent, so that pressure drops can be avoided.
- the cavity may be filled with the sound absorbing material, and the air guiding channel may be formed in the sound absorbing material.
- the outer wall of the air guiding channel is formed by the sound absorbing material.
- the relatively large amount of sound absorbing material improves the sound attenuation .
- the sound absorbing material provides a porous outer wall, so that air is gently guided through the air vent while as sound is allowed to propagate through the porous outer wall of the air guiding channel into the cavity.
- the air guiding channel may have a frustoconical shape with a growing cross-sectional area in the direction of flow. This improves the air flow through the air vent and renders the air vent particularly suitable for use in a naturally ventilated building.
- the air outlet tube may have a frustoconical shape with a growing cross-sectional area in the direction of flow. Thanks to the larger cross-sectional area at an outlet end of the air outlet tube, a reduced velocity of flow is achieved at the outlet end, thereby avoiding pressure drops as the air is spread into the room .
- the air outlet tube may be inserted into the cavity.
- the air outlet tube is introduced into the cavity so that an outlet end of the air inlet tube and an inlet end of the air outlet tube are spaced apart.
- the air vent becomes more compact and can thus be mounted in thinner walls.
- the air outlet tube has a frustoconical shape with a growing cross-sectional area in the direction of flow, the cross-sectional area at an inlet end of the air outlet tube can in this way be made smaller such that the acoustic performance is improved.
- the outlet tube may instead be located entirely or partly outside of the cavity. It is also possible to insert the air inlet tube partly or entirely into the cavity.
- the air inlet tube may have a smaller cross-sectional area than the air outlet tube.
- the air inlet tube may have a cylindrical shape, i.e. with a cross-sectional area that does not vary in the direction of flow.
- the air vent further comprises a funnel arranged at an inlet end of the air inlet tube, wherein the funnel is configured for guiding air into the air inlet tube.
- the funnel reduces the pressure drop at the air inlet.
- the funnel may be sound permeable for improved high frequency sound attenuation , or impermeable for improved low frequency sound attenuation . To make the funnel sound permeable, it may be provided with small holes, e.g. perforations, or be made of a mesh material.
- the funnel may be bell-shaped for improved air flow properties.
- the air vent further comprises an adjustable vent plate configured to be arranged downstream of the air outlet tube, wherein the vent plate comprises a sound absorbing disc configured to absorb sound propagating through the air outlet tube.
- the sound absorbing disc is made of a sound absorbing material, e.g. of the same type as used in the cavity. The sound absorbing disc improves the sound attenuation of the air vent.
- Fig . 1 shows a sectional view of an air vent according to a first embodiment of the invention
- Fig . 2 shows a sectional perspective view of the air vent in fig.
- Fig . 3 shows a sectional view of an air vent according to a second embodiment.
- An air vent 1 a according to a first embodiment is shown in figs. 1 -2 and an air vent 1 b according to a second embodiment is shown in fig. 3.
- the air vents 1 a, 1 b are shown mounted in a wall 2 of a building.
- the air vents are configured for directing a flow of air into a room of the building by means of natural ventilation , i.e. without the use of mechanical devices such as fans for creating an air flow.
- the air vent 1 a, 1 b comprises a housing 3 defining a cavity 4 enclosed therein.
- the housing 3 has a rigid, impermeable outer wall.
- a body 5 of a sound absorbing material is arranged within the cavity 4.
- the sound absorbing material may be of any type that is commonly used for this purpose, such as a fibre material or a foam material with an open cell structure.
- the housing 3 has an inlet opening 6 in a first end wall 16 of the housing 3.
- a cylindrical air inlet tube 7 extending along a centre axis A is connected to the inlet opening 6 for guiding air into the cavity 4 in a direction of flow D as shown by the arrow.
- the air inlet tube 7 projects from the housing 3.
- An air outlet tube 8 for guiding air out of the cavity 4 is provided downstream of, and spaced apart from , the air inlet tube 7.
- the air outlet tube 8 extends along the centre axis A and has a frustoconical shape with an inner diameter at an inlet end 9 which is smaller than an inner diameter at an outlet end 10.
- the air outlet tube 8 is inserted into the cavity 4, with the inlet end 9 located approximately halfway into the cavity 4 and with the outlet end 10 being level with a second end wall 1 7 of the housing 3.
- Both the air inlet tube 7 and the air outlet tube 8 are made with outer walls of rigid and impermeable material, without perforations or openings, and both have relatively small volumes, and relatively small cross-sectional areas, in comparison with the cavity 4.
- the air within the air inlet tube 7 and the air outlet tube 8 can thereby be regarded as acoustic masses, and the cavity 4 can be regarded as an acoustic spring providing sound attenuation .
- the cavity 4, the air inlet tube 7 and the air outlet tube 8 thus together form a reactive silencer. Furthermore, resistive sound attenuation is provided by the body 5 of sound absorbing material within the cavity 4.
- a frustoconical air guiding channel 1 1 for guiding the air within the cavity 4 from the air inlet tube 7 to the air outlet tube 8, is formed.
- the air outlet tube 8 is inserted into the air guiding channel 1 1 , such that the air outlet tube 8 forms a continuation of the air guiding channel 1 1 , with a smooth transition between the two.
- a bell-shaped and sound permeable funnel 12 is arranged at an inlet end of the air inlet tube 7.
- the funnel 12 is configured for guiding air into the air inlet tube 7.
- a screen 13 for weather protection is in the shown embodiments mounted above the air inlet tube 7 and the funnel 12. In other embodiments, it is possible to omit the funnel and the screen , e.g. if the air vent is to be used for directing a flow of air between two rooms within a building.
- an adjustable vent plate 1 4 is provided for distributing the air into the room of the building.
- the vent plate 14 comprises a sound absorbing disc 1 5 configured to absorb sound propagating through the air outlet tube 8.
- the sound absorbing disc 1 5 is for this purpose centred on the centre axis A and has a larger diameter than the inner diameter of the air outlet tube 8. By rotating the vent plate 14 about the centre axis A, the flow of air into the room can be adjusted.
- the sound absorbing disc 15 may be made of the same sound absorbing material as the body 5, or of a different sound absorbing material.
- the air vent 1 b further comprises an elongation tube 18 that partly encloses the housing 3.
- a ring 19 of sound absorbing material is provided so that a central channel 20 is formed directly downstream of the air outlet tube 8. Air propagating through the air outlet tube 8 thus flows via the central channel 20 to the vent plate 14.
- the elongation tube 18 may be used to adapt the air vent 1 b to various wall thicknesses, by providing the ring 1 9 with a suitable thickness.
- the housing is formed of a cylindrical tube sharing a common centre axis with the air inlet tube and the air outlet tube.
- the housing may have another cross-sectional shape, e.g . square, rectangular or oval.
- the air inlet tube and the air outlet tube which preferably shares a common centre axis, do not need to have the centre axis in common with a centre axis of the housing .
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1850117A SE1850117A1 (en) | 2018-02-01 | 2018-02-01 | An air vent |
PCT/SE2019/050069 WO2019151931A1 (en) | 2018-02-01 | 2019-01-29 | An air vent |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3746721A1 true EP3746721A1 (en) | 2020-12-09 |
EP3746721A4 EP3746721A4 (en) | 2021-10-20 |
Family
ID=67478365
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19747424.0A Pending EP3746721A4 (en) | 2018-02-01 | 2019-01-29 | An air vent |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3746721A4 (en) |
SE (1) | SE1850117A1 (en) |
WO (1) | WO2019151931A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3134877A1 (en) * | 2022-04-21 | 2023-10-27 | Atlantic Climatisation et Traitement d’Air Industrie | Rain visor for a home ventilation system |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3507354A (en) * | 1968-06-14 | 1970-04-21 | Dunham Bush Inc | Sound attenuating air discharge terminal device |
US3789747A (en) * | 1972-12-15 | 1974-02-05 | Industrial Acoustics Co | Ventilated acoustic structural panel |
FI90588C (en) * | 1991-03-18 | 1994-02-25 | Valmet Paper Machinery Inc | Reactive muffler, especially for paper mill air ducts |
SE516042C2 (en) * | 2000-03-21 | 2001-11-12 | Freshman Ab | Air flow regulating valve actuator |
US6431974B1 (en) * | 2000-03-29 | 2002-08-13 | Met Pro Corporation | Acoustic wind band |
JP2007322043A (en) * | 2006-05-31 | 2007-12-13 | Matsushita Electric Ind Co Ltd | Sound absorpbing pipe |
JP2008122023A (en) * | 2006-11-15 | 2008-05-29 | Mk Seiko Co Ltd | Silencer |
WO2009071963A1 (en) * | 2007-12-04 | 2009-06-11 | Eur.Ex S.R.L. | Silenced air intake for ventilation ducts, silencer for the air intake and method of operation of the air intake and silencer |
GB2528950A (en) * | 2014-08-06 | 2016-02-10 | Aaf Ltd | Sound suppression apparatus |
EP3121527B1 (en) * | 2015-07-21 | 2020-03-18 | Aereco GmbH | Ventilating device for ventilation of rooms |
-
2018
- 2018-02-01 SE SE1850117A patent/SE1850117A1/en not_active Application Discontinuation
-
2019
- 2019-01-29 WO PCT/SE2019/050069 patent/WO2019151931A1/en unknown
- 2019-01-29 EP EP19747424.0A patent/EP3746721A4/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP3746721A4 (en) | 2021-10-20 |
WO2019151931A1 (en) | 2019-08-08 |
SE1850117A1 (en) | 2019-08-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20200630 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
A4 | Supplementary search report drawn up and despatched |
Effective date: 20210917 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: G10K 11/162 20060101ALI20210914BHEP Ipc: F24F 13/062 20060101ALI20210914BHEP Ipc: F24F 7/00 20210101ALI20210914BHEP Ipc: G10K 11/16 20060101ALI20210914BHEP Ipc: F24F 13/06 20060101ALI20210914BHEP Ipc: F24F 13/24 20060101AFI20210914BHEP |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20230418 |