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WO1993009389A1 - Module de ventilation et de filtrage comportant un dispositif antibruit - Google Patents

Module de ventilation et de filtrage comportant un dispositif antibruit Download PDF

Info

Publication number
WO1993009389A1
WO1993009389A1 PCT/DK1992/000323 DK9200323W WO9309389A1 WO 1993009389 A1 WO1993009389 A1 WO 1993009389A1 DK 9200323 W DK9200323 W DK 9200323W WO 9309389 A1 WO9309389 A1 WO 9309389A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
ventilation
fan
module according
air
Prior art date
Application number
PCT/DK1992/000323
Other languages
English (en)
Inventor
Finn Nielsen
Niels Erik Friis Dam
Henrik Kjær BAGGER
Original Assignee
Novenco A/S
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 Novenco A/S filed Critical Novenco A/S
Publication of WO1993009389A1 publication Critical patent/WO1993009389A1/fr

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
    • F24F13/24—Means for preventing or suppressing noise

Definitions

  • the invention relates to a ventilation and filter module for clean room ventilation and with a housing to be mounted in a ceiling and having one end wall facing the ventilated room and formed by a high efficiency filter, while a centrifugal fan with comple ⁇ tely circumferential air outlet is disposed in connec ⁇ tion with an air intake in the opposite end wall, a space division being provided in the interior of the housing to accomplish a uniform distribution substan- tially free of turbulence of the amount of air radially emitted from the fan across the surface of the filter facing the fan, coverings of sound absorbing material being mounted on the side walls of the housing in a chamber surrounding the fan.
  • ventilation systems in which the air exhausted from the room is recirculated through ventilation and filter modules, also designated tunnel modules, mounted in the ceiling, and is blown into the room as a laminar flow at a comparatively low velocity through a high-efficiency filter in each module.
  • Prom EP-A2-0 340 433 such a tunnel module is known in which the space above the filter is divided by substantially horizontal walls into three chambers with the centrifugal fan disposed asymmetrically in the central chamber quite adjacent tp one side wall of the housing.
  • the air is directed from the fan through a comparatively long channel under a reversal of direc- tion through 180° to the upper side of the filter.
  • the asymmetrical positioning makes it difficult to obtain a uniform air distribution across the entire filter and the length of the slot together with said reversal of the flow direction results in a relatively low effi- ciency.
  • a ventilation and filter module is charac ⁇ terized in that the space division is provided by means of a partition arranged beneath the fan at a distance above the filter, substantially parallel thereto, said partition having a covering of sound absorbing material on the side facing the fan, and defining together with the coverings disposed on the side walls an air slot substantially linear in its longitudinal direction from the chamber around the fan to a chamber located above the filter.
  • the air slot By the geometry of the air slot resulting from this space division the air slot will extend mainly linearly from the fan chamber and have its opening positioned at a distance from the side walls of the housing corresponding to the thickness of the sound dampening coverings disposed thereon and thus, at a corresponding distance over the upper side of the filter reckoned from the edges of the filter at the side walls of the housing.
  • a static pressure with an even air distribution free of turbulence may in this manner be established throughout the filter.
  • the slot geometry further entails that the discharge flow from the fan only has to change direc ⁇ tion through 90° in order to pass through the slot, thereby obtaining an improved efficiency.
  • Pig. 1 is an axial sectional view of an embodi ⁇ ment of a ventilation and filter module according to the invention.
  • Pig. 2 is a sectional view along the line II-II in Fig. 1, and
  • Fig. 3 shows a modified embodiment.
  • the ven- tilation and filter module comprises a housing which may have a substantially square cross-section with side walls l.
  • One end wall of the housing facing the ven ⁇ tilated room is formed by a high-efficiency filter 2, e.g. of the so-called HEPA type, generally known in connection with clean room ventilation.
  • an air intake 4 is positioned beneath which a centri ⁇ fugal fan 5 with fully circumferential air outlet is mounted in the housing.
  • the fan 5 is preferably of a low-noise design, as explained in Applicants' concurrently filed Patent Application No.
  • a space division is provided in the housing which accord ⁇ ing to the invention comprises a first chamber 6 around the fan 5 and a second chamber 7 immediately above the filter.
  • the two chambers 6 and 7 are separated by a partition 8 positioned below the fan 5 and at a distance above the filter 2 and parallel thereto and having on the side facing the fan a covering 9 of a sound absorbing material that may be formed as a cut- to-shape member of compressed mineral wool which is a material with good sound attenuation properties in the low-frequency range in which the blade frequency of the centrifugal fan 5 is located.
  • Coverings 10 and 11 of sound absorbing material of the same type as the covering 9 are placed on the side walls 1 of the chamber 6 as well as the end wall 3 to obtain a further noise dampen ⁇ ing.
  • the lower edges of the coverings 10 on the side walls 1 facing the filter 2 are positioned on a level with the underside of the partition 8 so as to create in the illustrated embodiment between the partition 8 and its covering 9 of mineral wool and the coverings 10 a circumferential quadratic air slot 12 the longitudinal direction of which is parallel to the side walls 1.
  • the sides of the coverings 9 and 10 facing the chamber 6 and the air slot 12 are provided with a surface treatment of an appropriate binding agent.
  • the coverings 9 and 10 have a comparatively large thickness, e.g. 200 mm as regards the coverings 10, and 300 mm as regards the covering 9.
  • the air slot 12 the length of which with the illustrated geometry is determined by the thickness of the covering 9, i.e. in the illus ⁇ trated embodiment about 300 mm, has a width dimensioned to attain a high sound dampening. With the above men ⁇ tioned dimensions the slot width may e.g. be 55 mm. On the face of it, it would have to be expected that the larger length of the air slot 12 would result in a deterioration of the air-technical efficiency but, on the contrary, it has suprisingly turned out that the efficiency has been improved.
  • the efficiency is improved when the length of the air slot 12 is substantially larger, e.g. at least three times larger than the width of the slot.
  • the improved efficiency is probably obtained because the larger slot length offers a more uniform velocity of the air flow ⁇ ing out through the outlet 14 of the air slot 12.
  • the discharge loss at the outlet 14 is determined by the square of the flow velocity the blow-off loss is diminished when the air flow velo ⁇ city becomes more uniform.
  • the partition 8 On the underside facing the filter 2 the partition 8 consists of a plate of a sound reflecting material, e.g. sheet steel, and also the lower edges of the coverings 10 facing the filter are covered by plates 13 of a sound reflecting material.
  • a sound reflecting material e.g. sheet steel
  • the covering 11 on the underside of the end wall 3 may like the coverings 9 and 10 be com- posed of mineral wool members cut-to-shape.
  • the thick ⁇ ness of this covering is substantially determined by the distance from the end wall 3 to the air outlet of the fan 5.
  • the illustrated design of the ventilation and filter module entails that the air flow from the air outlet of the fan 5 through the air slot 12 that is linear in its longitudinal direction to the outlet 14 thereof in the chamber 7 is subjected to a change in direction not exceeding 90°.
  • the circumferential slot 12 with the outlet 14 positioned at a distance from the side walls 1 of the housing determined by the thickness of the coverings 10 entails in combination with the location of the partition 8 at a suitable overhead clearance above the filter 2 that a mainly uniform air distribution free of turbulence is obtained with a velocity profile showing a faint maximum in the proximity of the peripheral lateral edges of the filter
  • the laminar character of the air flow from the fan 5 to the filter 2 may be further ensured by rounding the edges of the covering 9 of the partition 8 facing the inlet 15 of the air slot 12 in the chamber 6.
  • the housing of the module has side walls 16 forming above the filter a frustum of a pyramid with a square cross- section.
  • the coverings 18 on the side walls 16 extend quite up to the end walls 19 in which the air intake 20 is positioned.
  • the partition 21 has inclined lateral edges 22 that are somewhat steeper than the walls 16 of the housing so that the air slot 26 from the chamber around the fan 24 diverging conically towards the chamber 25 above the filter 17 has an increasing width in the direction towards the chamber 25, thereby acting as a kind of diffuser which may further enhance the efficiency.
  • the sound dampening coverings are made of moulded material a further improvement of the efficiency may conceivingly be obtained through such a design of the partitions and the coverings applied to the walls of the housing that the air slot has a circular inlet in the chamber around the fan and an outlet towards the chamber above the filter matching the side walls of the housing, e.g. quadratic.
  • the module according to the invention does not need to have a substantially square cross- section.
  • the module may for instance have an oblong cross-section with the side ratios 1:2, provided the module fits into the supporting structure in the ceiling on site of use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Module de ventilation et de filtrage destiné à la ventilation des salles blanches. Il comporte un boîtier conçu pour être monté dans un plafond et doté d'une paroi terminale constituée d'un filtre à haut rendement (2), l'autre paroi terminale (3) étant pourvue d'une soufflante centrifuge (5) à orifice de sortie d'air entièrement circonférentiel, associée à une voie d'entrée d'air (4). Le volume intérieur du boîtier est partagé de manière à assurer une répartition homogène et sensiblement exempte de tourbillonnement de l'air émis dans le sens radial par la soufflante (5) et passant sur la face supérieure du filtre (2). Des revêtements insonorisants sont disposés dans une chambre (6) entourant la soufflante (5). Le volume intérieur est partagé par une cloison (8) placée sous la soufflante (5) et à une certaine distance au-dessus du filtre (2), ladite cloison étant parallèle à ce dernier et dotée d'un revêtement insonorisant (9) situé du côté tourné vers la soufflante (5), et associé aux revêtements (10) des parois latérales de manière à délimiter une fente (12) sensiblement linéaire dans son sens longitudinal s'étendant de la chambre (6) entourant la soufflante à une chambre (7) située au-dessus du filtre (2; 17).
PCT/DK1992/000323 1991-11-08 1992-11-06 Module de ventilation et de filtrage comportant un dispositif antibruit WO1993009389A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK183691A DK183691A (da) 1991-11-08 1991-11-08 Ventilations- og filtermodul til renrumsventilation
DK1836/91 1991-11-08

Publications (1)

Publication Number Publication Date
WO1993009389A1 true WO1993009389A1 (fr) 1993-05-13

Family

ID=8108425

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1992/000323 WO1993009389A1 (fr) 1991-11-08 1992-11-06 Module de ventilation et de filtrage comportant un dispositif antibruit

Country Status (3)

Country Link
AU (1) AU2942192A (fr)
DK (1) DK183691A (fr)
WO (1) WO1993009389A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995014196A1 (fr) * 1993-11-17 1995-05-26 Oestberg Hans Appareil de recuperation de chaleur pour systemes de chauffage et d'echange d'air
WO1996026395A1 (fr) * 1995-02-24 1996-08-29 Christiansen, John Dispositif de conditionnement de l'air localise, economique et salubre
DE19511158A1 (de) * 1995-03-27 1996-10-02 Meissner & Wurst Ventilatoreinheit für Reinräume
EP1113858A4 (fr) * 1998-08-24 2001-11-14 Hepa Corp Unite de filtre pour ventilateur a haut rendement de filtrage, faible consommation d'energie et faible bruit
SG84618A1 (en) * 1999-09-16 2001-11-20 M & W Zander Facility Eng Gmbh Cleanest air arrangement for the pharmaceutical, food and bio-technical area
WO2003095902A1 (fr) * 2002-05-13 2003-11-20 Fläkt Woods AB Dispositif de ventilation par deplacement comprenant des filtres, des absorbeurs de sons et un ventilateur supporte dans un bloc de materiau d'absorption des sons
WO2003095901A1 (fr) * 2002-05-13 2003-11-20 Fläkt Woods AB Agencement pour une ventilation par deplacement comprenant un corps de support presentant des plans de support reliables permettant de servir de support a des dispositifs, notamment un module de filtre
EP2295881A1 (fr) * 2009-07-29 2011-03-16 Vossloh Kiepe Ges.m.b.H. Installation de chauffage, de climatisation et d'aération
EP2574794B1 (fr) * 2011-09-30 2018-01-24 TROX GmbH Composant d'aération
DE102022120097A1 (de) 2021-08-11 2023-02-16 Viessmann Climate Solutions Se Luftreinigungsvorrichtung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4560395A (en) * 1984-04-17 1985-12-24 Environmental Air Control, Inc. Compact blower and filter assemblies for use in clean air environments
EP0340433A2 (fr) * 1988-04-30 1989-11-08 BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG Module de tunnel pour créer une enceinte propre en technique à flux laminaire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4560395A (en) * 1984-04-17 1985-12-24 Environmental Air Control, Inc. Compact blower and filter assemblies for use in clean air environments
EP0340433A2 (fr) * 1988-04-30 1989-11-08 BABCOCK-BSH AKTIENGESELLSCHAFT vormals Büttner-Schilde-Haas AG Module de tunnel pour créer une enceinte propre en technique à flux laminaire

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995014196A1 (fr) * 1993-11-17 1995-05-26 Oestberg Hans Appareil de recuperation de chaleur pour systemes de chauffage et d'echange d'air
WO1996026395A1 (fr) * 1995-02-24 1996-08-29 Christiansen, John Dispositif de conditionnement de l'air localise, economique et salubre
DE19511158A1 (de) * 1995-03-27 1996-10-02 Meissner & Wurst Ventilatoreinheit für Reinräume
EP0735329A3 (fr) * 1995-03-27 1997-11-26 Meissner & Wurst GmbH & Co. Lufttechnische Anlagen Gebäude- und Verfahrenstechnik Ventilateur pour salles propres
US5876279A (en) * 1995-03-27 1999-03-02 Meissner + Wurst GmbH + Co. Lufttechnische Anlagen Gebaude--und Verfahrenstechnik Blower unit for clean room
DE19511158C2 (de) * 1995-03-27 2000-01-27 Meissner & Wurst Ventilatoreinheit für Reinräume
EP1113858A4 (fr) * 1998-08-24 2001-11-14 Hepa Corp Unite de filtre pour ventilateur a haut rendement de filtrage, faible consommation d'energie et faible bruit
SG84618A1 (en) * 1999-09-16 2001-11-20 M & W Zander Facility Eng Gmbh Cleanest air arrangement for the pharmaceutical, food and bio-technical area
EP1085270A3 (fr) * 1999-09-16 2003-11-05 M+W Zander Facility Engineering GmbH Dispositif pour rendre l'air extra pur dans les domaines de la biotechnologie, des produits alimentaires, et de la pharmacie
WO2003095902A1 (fr) * 2002-05-13 2003-11-20 Fläkt Woods AB Dispositif de ventilation par deplacement comprenant des filtres, des absorbeurs de sons et un ventilateur supporte dans un bloc de materiau d'absorption des sons
WO2003095901A1 (fr) * 2002-05-13 2003-11-20 Fläkt Woods AB Agencement pour une ventilation par deplacement comprenant un corps de support presentant des plans de support reliables permettant de servir de support a des dispositifs, notamment un module de filtre
EP2295881A1 (fr) * 2009-07-29 2011-03-16 Vossloh Kiepe Ges.m.b.H. Installation de chauffage, de climatisation et d'aération
EP2574794B1 (fr) * 2011-09-30 2018-01-24 TROX GmbH Composant d'aération
DE102022120097A1 (de) 2021-08-11 2023-02-16 Viessmann Climate Solutions Se Luftreinigungsvorrichtung

Also Published As

Publication number Publication date
AU2942192A (en) 1993-06-07
DK183691D0 (da) 1991-11-08
DK183691A (da) 1993-05-09

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