WO1985004240A1 - Systeme portatif permettant de produire un espace d'air propre - Google Patents

Systeme portatif permettant de produire un espace d'air propre Download PDF

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Publication number
WO1985004240A1
WO1985004240A1 PCT/US1985/000387 US8500387W WO8504240A1 WO 1985004240 A1 WO1985004240 A1 WO 1985004240A1 US 8500387 W US8500387 W US 8500387W WO 8504240 A1 WO8504240 A1 WO 8504240A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
clean air
plenum
clean
space
Prior art date
Application number
PCT/US1985/000387
Other languages
English (en)
Inventor
Leo J. Foster
Francis J. Calderbank
Original Assignee
Foster Leo J
Calderbank Francis J
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 Foster Leo J, Calderbank Francis J filed Critical Foster Leo J
Publication of WO1985004240A1 publication Critical patent/WO1985004240A1/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
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
    • F24F3/163—Clean air work stations, i.e. selected areas within a space which filtered air is passed

Definitions

  • This invention relates to apparatus for the creation of a clean air space and particularly to a portable clean air space surrounded by an air curtain.
  • Clean rooms may include an air distribution ceiling for dis- tributing and delivering pressurized clean air downward ⁇ ly into the room.
  • air distribution ceiling for this purpose is taught in U.S. Patent No. 4,060,025 - Pelosi, Jr.
  • uniform air delivery referred to as laminar flow, is achieved by allowing pressurized, clean air in a primary plenum above the ceiling to pass successively through pluralities of holes in the upper and lower panels of a secondary plenum, the lower panel of which forms the room ceiling.
  • Clean rooms are extremely expensive to construct and maintain. They are particularly inefficient and/or ineffective when the work area desired requires only a portion of a room and when isolation for individuals who must work in the clean air space is desired.
  • Potapenko teaches a clean air supply encompassing a hospital bed and supplied from a plenum within a canopy above the bed. While this device is effective for preventing contamination of a patient in the hospital bed, no provision is made for isolation, except by complete reversal of the system (column 5, lines 39- 56).
  • Air curtains have also been used to surround such clean air spaces.
  • An air curtain is a flowing stream of air used to separate the spaces on either side thereof. Air curtains are commonly used in conjunction with doorways. See, for example, U. S. Patent No. 3,886,851 - Berner and U. S. Patent No. 3,023,688 - Kramer, Jr.
  • Truhan teaches the use of a single plenum to provide a localized clean air space comprising a column of treated air withprogressively ⁇ sively increasing air flow volume from the center of the column outwardly.
  • Truhan's apparatus does not teach a continuous discrete "air curtain” surrounding the clean air core. Instead, Truhan specifically avoids formation of such an "air curtain” (see column 5, lines 43-53).
  • a commercial installation built by the assignee of the present invention prior to the present invention may also be of interest.
  • a clean air space is provided in a hos ⁇ pital operating room.
  • This space comprises a core of low velocity downwardly flowing air surrounded by an air curtain. No air recapture is provided.
  • the core and air curtain are fed from a common overhead plenum, the central portion of the lower wall of which is a per ⁇ forated plate.
  • the air curtain forming means Surrounding the perforated plate, the air curtain forming means comprises a multiplicity of narrow channel elements each including a plurality of vertically oriented louvers.
  • the clean air space produced.by a system con- cortted in accordance with the present invention, in ⁇ cludes a relatively low velocity clean air core sur ⁇ rounded by a continuous, relatively high velocity con ⁇ centric clean air curtain.
  • the system for producing this clean air space includes a ducted support frame having a vertical outer surface defining a portion of the-periphery of the clean air space and an air return opening at the bottom of this surface. Also included is an air plenum extending horizontally from the ducted support frame and in air flow communication with this frame. The plenum has a bottom for distributing air flow into the plenum to form the clean air core and the clean air curtain.
  • the bottom of the plenum includes a perforated plate for forming the clean air core and a substantially continuous passage surrounding the per- forated plate and extending along the outer surface of the ducted support frame for forming the clean air cur ⁇ tain.
  • the system also includes means for developing air flow through the ducted support frame and out of the air plenum through the bottom of the air plenum into the clean air space and back into the ducted support frame through the air return opening.
  • Filtering means are provided for capturing particulate matter entrapped in the air flow. The filtering means are positioned in the air flow path through the ducted support frame and the air plenum.
  • Figure 1 is a perspective view of the portable clean air space system of the present invention.
  • Figure 2 is a sectional view of the system of Figure 1, taken in the plane 2-2 of Figure 1.
  • Figure 3 is a sectional view in the plane 3-3 of Figure 2.
  • Figure 4 is an expanded view of Area 4 of Figure 3.
  • Figure 5 shows an alternate embodiment of the structure of Figure 4.
  • Figure 6 shows a bottom view of the upper struc ⁇ ture of the apparatus shown in Figure 1.
  • Figure 7 is a perspective view of another em- bodiment of the unit which forms the clean air curtain.
  • Figure 8 is a sectional view showing the Figure 7 unit in place in the system of the present invention. Detailed Description of the Invention
  • FIG. 1 shows portable clean air space genera ⁇ ting system 10 having a portably mounted ducted frame 15 and a unitary air supply plenum 16 supplied with air by two blowers 12.
  • the sides of plenum 16 are formed by plenum enclosure 17.
  • the top of plenum 16 is formed by high efficiency particulate air (HEPA) filter 24.
  • HEPA filter 24 A portion of the clean air which has passed through HEPA filter 24 passes downward through perforated air distri- bution plate 26, to form a laminar flow core of rela ⁇ tively low velocity clean air.
  • a second portion of air from filter 24 passes around the perimeter of perforated plate 26 and through slot 36 (described in more detail below) to.produce a relatively higher velocity concen- trie clean air curtain bounding the core.
  • Portable clean air space system 10 is provided with a stand composed of horizontal members 28 and locking casters 30 to allow mobility. System 10 may thus be rolled up to a work area and plenum 16 may extend above said work area. In its preferred form, system 10 has a height of approxi ⁇ mately eight feet six inches, a width of approximately seven feet, and a depth of approximately four feet.
  • Figure 2 is a side view of portable clean air space system 10 and shows schematically the air currents created thereby.
  • HEPA filter 24 securely seals the chamber above plenum 16 thereby forcing all air supplied by blower 12 to be forced through filter 24.
  • the large pressure loss through filter 24 causes all of the air forced through filter 24 to have a substantially uniform linear velocity.
  • HEPA filter 24 is effective to remove particu ⁇ late contaminants to provide Class 100 air under Federal Standard 209(b) which requires fewer than 100 particles of .5 microns and larger per cubic foot.
  • Class 100 air is provided to the work space horizontally de ⁇ fined the by area of plate 26.
  • Filter 24 is secured to support bars 38 using suspension rods 32. There are eight suspension rods 32 around the periphery of filter 24, two on each of its four sides.
  • Air which has passed through filter 24 must pass either through the free areas of perforated plate 26 or across the perimeter of plate 26 in a direction per- pendicular to plate 26 and therefrom through slot 36.
  • the free area of perforated plate 26 is created by one-eighth inch holes with staggered centers separated by approximately twenty-one-thirty-seconds inch. This arrangement of perforations is effective to produce laminar flow in the core area of the clean air space.
  • Slot 36 is a continuous slot defined by spaced apart, vertically oriented, channel defining means, described more fully below. Slot 36 completely surrounds plate 26. Air forced from plenum 16 through slot 36 forms a concentric air curtain completely surrounding the clean air core.
  • FIG. 3 blowers 12 are seen at the rear of the chamber above plenum 16.
  • Plenum 16 comprises a single air source for the core and the curtain.
  • Suspension bars 32 which secure HEPA filter 24 to support member 38, continue downwardly and are bolted to support angle 34.
  • Support angle 34 completely encircles and supports perforated plate 26.
  • Slot 36 is formed between an upwardly extending strip of support angle 34 and a facing upwardly extending wall of plenum enclosure 17 dependant from ducted frame 15.
  • Perforated plate 26 is tack welded to support angle 34 and all gaps between plate 26 and angle 34 are sealed with an appropriate sealant such as Selastic manufactured by Dow Chemical. This prevents random air motion caused by air leaking between the plate and the support means which is a common problem in clean air rooms where the ceiling panels are removable.
  • each suspension rod 32 is a stainless steel threaded bar with a diameter of approximately five-sixteenths inch.
  • HEPA frame 52 is conventionally manufactured as part of a HEPA filter assembly and may be formed from wood, metal or plastic. Filter frame 52 rests on eight 2" x 1-1/4" right angle filter supports 53 which may be rotated ninety degrees to allow removal of filter 24. Each support 53 is secured to a rod 32 by a pair of rod nuts 32.
  • Horizontal support member 38 is, in turn, secured to support member 44 which is dependant from ducted frame 15 (not seen in Figure 4) .
  • Suspension rod 32 is bolted to angle support 34 through perforated plate 26 to secure plate 26 at a level above the bottom 50 of wall 42.
  • Slot 36, between support angle 34 and the wall 42, is approximately one-quarter inch wide. It is through this slot that an air curtain with a velocity of approximately 1000 feet per minute is formed in the preferred form of the present invention. Both the horizontal and vertical portions of support angle 34 are approximately one inch wide.
  • Fig. 5 shows an alternate embodiment of the plate support structure of Fig. 4.
  • suspension rod 32 does not extend beyond the length necessary to secure filter 24.
  • the function of the portion of suspension rod 32 which extended downward to support perforated plate 26 is now performed by fastener 46.
  • Fastener 46 is secured to wall 42 by pop rivets 48.
  • Fastener 46 is approximately one-eighth inch thick and one inch wide.
  • Support angle 34, sealed to perforated plate 26 as in the previous embodiment, is bolted to fastener 46.
  • the upper horizontal portion of fastener 46 serves as a spacer to maintain a distance of approximtely one-quarter inch between sup ⁇ port angle 34 and wall 42.
  • spacers 52 Two on each of the four sides, assist in maintaining the proper spacing of approxi ⁇ mately one-quarter inch for slot 36. Spacers 52 occlude only approximately .9% of the total length of slot 36. Therefore, any discontinuities caused by spacers 52 are quickly “healed” as the air curtain travels downwardly beyond spacers 52. The extension of wall 42 below the ends of spacers 52 assists in this "healing" because the air tends to follow the surface- of the wall 52.
  • a further function ⁇ al feature of the present invention comprises a hinged attachment of the upper distribution chamber assembly to the lower part of ducted frame 15 by means of hinge 60.
  • bolts 66 permits the upper distribution chamber assembly to be folded, at hinge 60, downwardly and against the front of the lower segment of ducted frame 15.
  • Figures 7 and 8 show another arrangement for forming the clean air curtain. This arrangement differs from the apparatus illustrated in Figures 2-6 by the use of a pair of concentric openings 70 and 72 to form the clean air curtain instead of a single concentric open ⁇ ing.
  • concentric slot 36 of Figures 2-6 By dividing concentric slot 36 of Figures 2-6 into two concentric slots 70 and 72, with each, for example, 1/8" wide and 1" high, the velocity of the flow of the air curtain drops off at a lower rate than with a single slot. This is believed to result from each slot pro ⁇ ducing a narrower, laminar flow of air which reduces the turbulence of the air flow and, therefore, reduces the aspiration of the surrounding air by the air curtain. Reduced aspiration results in a smaller mass of air movement with the final result that the reduction in velocity of the clean air curtain is less than for an air curtain produced by a single slot. A 1:8 ratio of slot width to slot height has been found to produce the desired results.
  • Concentric slots 70 and 72 are formed by a rec ⁇ tangular frame composed of four sections 74, 76, 78 and 80. Each frame section has three spaced vertical walls 82, 84 and 86 which define slots 70 and 72. Walls 82 and 86 of frame sections 76, 78 and 80 have horizontally extending flanges 88 and 90. Flanges 88 extend inward of walls 82 and flanges 90 extend outward of walls 86. Only inner wall 82 of frame section 74 has a flange 88. Outer wall 86 of.frame section 74 has no flange which extends outward of the frame. This permits placement of frame section 74 against the outside surface 91 of the ducted support frame with slots 70 and 72 close to this surface. In this way, the clean air curtain is formed along surface 91, rather than being spaced from this surface.
  • the frame sections are assembled from com ⁇ ponents, as illustrated, which are joined together by suitable means, such as weld joints 92.
  • the frame sec- tions are joined together at their ends by suitable means, such as weld joints 94.
  • the frame of Figure 7 is mounted in place, by attachment to the air plenum. This can be accomplished by a plurality of screws extending through outer flanges 90, running along three edges of the frame, and the walls of the air plenum.
  • a suitable gasket material 96 is placed between frame section 74 and surface 91 and between flanges 90 and the walls of the air plenum to seal these joints.
  • perforated plate 98 which forms the clean air core, is placed within the frame and rests on inner flanges 88. This is shown in Figure 8. While this invention has been described with reference to specific embodiments thereof, it is not considered to be limited thereto. Accordingly, the appended claims are intended to be construed to encom- pass not only those forms and embodiments of the inven ⁇ tions specifically described or generally referred to herein but to such other embodiments and forms of the invention as may be devised by those skilled in the art without departing from the true spirit and scope of the present invention.

Landscapes

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

Abstract

Système permettant de produire un espace d'air propre possédant un noyau d'air propre à une vitesse relativement faible, entouré d'un rideau continu concentrique d'air propre à une vitesse relativement élevée en utilisant un seul plénum (16). Le plénum unique (16) envoie de l'air, à travers un filtre à air particulaire à rendement élevé (24), à une plaque de distribution d'air (26) qui produit le noyau et à un passage (36) entourant complètement la plaque (26) qui produit le rideau d'air propre. Un orifice de retour d'air (22) permet d'aspirer l'air de l'espace d'air propre et de le faire recirculer au travers du système pour obtenir l'isolation. L'air est propulsé au travers du système par des soufflantes (12).
PCT/US1985/000387 1984-03-12 1985-03-11 Systeme portatif permettant de produire un espace d'air propre WO1985004240A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US58838584A 1984-03-12 1984-03-12
US70945485A 1985-03-08 1985-03-08
US709,454 1985-03-08
US588,385 1990-09-26

Publications (1)

Publication Number Publication Date
WO1985004240A1 true WO1985004240A1 (fr) 1985-09-26

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Country Status (3)

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EP (1) EP0183709A1 (fr)
AU (1) AU4110585A (fr)
WO (1) WO1985004240A1 (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2622960A1 (fr) * 1987-11-16 1989-05-12 Bardet Guy Unite de production de flux laminaire sterile a circulation verticale
EP0326726A1 (fr) * 1988-02-02 1989-08-09 Hirayama Setsubi Kabushiki Kaisha Système de salle blanche et unité modulaire pour le même système de salle blanche
GB2278771A (en) * 1993-06-10 1994-12-14 Ma Thomas Tsoi Hei Extracting airborne dust
FR2785370A1 (fr) * 1998-11-04 2000-05-05 Ensmse Dispositif et procede de traitement d'air realisant une isolation par rideau d'air
DE20111081U1 (de) 2001-07-06 2001-10-04 Clean-Tek GmbH Systemteile zum Bau von technischen Räumen, 71272 Renningen Befestigungsvorrichtung für eine Filter-Ventilatoreinheit eines Reinraumsystems
EP1161897A1 (fr) * 2000-06-06 2001-12-12 Finnfuture OY Guichet pour restaurants et un procédé pour son utilisation
WO2002093082A1 (fr) * 2001-05-14 2002-11-21 Acanthe Sarl Procede et dispositif pour diffuser un flux de protection a l'egard d'une ambiance environnante
FR2833844A1 (fr) * 2001-12-21 2003-06-27 Airinspace Ltd Dispositif mobile d'isolement aeraulique contre la contamination aeroportee, a geometrie variable de diffusseur d'air
GB2436448A (en) * 2006-03-17 2007-09-26 Extract Technology Ltd Containment assembly comprising an operator booth with downward recirculatory airflow
EP1918653A3 (fr) * 2002-09-04 2008-08-27 Johnson Medical Development Pte Ltd Système, dispositif et procédé de ventilation
GB2480884A (en) * 2010-06-05 2011-12-07 Thermoscreens Ltd Air Curtain Discharge Device
WO2021197521A1 (fr) * 2020-04-04 2021-10-07 Dirk Barnstedt Système de ventilation de postes de travail individuels pour éviter des infections par gouttelettes
GB2604179A (en) * 2021-02-26 2022-08-31 Perseptive Ltd Air curtain surrounding a hospital bed
WO2022180288A1 (fr) * 2021-02-26 2022-09-01 Universidad De Valladolid Système de protection contre la contagion de virus au niveau de postes de travail de bureau
EP4080127A3 (fr) * 2021-04-20 2023-02-22 FLOWGenuity Inc. Système de création d'un micro-environnement dans un environnement ambiant
US11859864B1 (en) * 2020-05-18 2024-01-02 Wunderlich-Malec Engineering, Inc. Particulate and virus barrier

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3626837A (en) * 1970-02-13 1971-12-14 Chs Ind Inc Dual plenum for ventilating ceilings in clean rooms
US3724172A (en) * 1971-06-16 1973-04-03 W Wood Filtered air breathing zone
US3726204A (en) * 1971-06-23 1973-04-10 Svenska Flaektfabriken Ab Distributing device in plants for the maintenance of a dustfree, bacteriafree zone in a room
US3935803A (en) * 1972-10-12 1976-02-03 Flanders Filters, Inc. Air filtration apparatus
JPS58110938A (ja) * 1981-12-24 1983-07-01 Takenaka Komuten Co Ltd 空気清浄ユニツト
JPS58127033A (ja) * 1982-01-25 1983-07-28 Hitachi Ltd 清浄室装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3626837A (en) * 1970-02-13 1971-12-14 Chs Ind Inc Dual plenum for ventilating ceilings in clean rooms
US3724172A (en) * 1971-06-16 1973-04-03 W Wood Filtered air breathing zone
US3726204A (en) * 1971-06-23 1973-04-10 Svenska Flaektfabriken Ab Distributing device in plants for the maintenance of a dustfree, bacteriafree zone in a room
US3935803A (en) * 1972-10-12 1976-02-03 Flanders Filters, Inc. Air filtration apparatus
JPS58110938A (ja) * 1981-12-24 1983-07-01 Takenaka Komuten Co Ltd 空気清浄ユニツト
JPS58127033A (ja) * 1982-01-25 1983-07-28 Hitachi Ltd 清浄室装置

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2622960A1 (fr) * 1987-11-16 1989-05-12 Bardet Guy Unite de production de flux laminaire sterile a circulation verticale
EP0396842A1 (fr) * 1987-11-16 1990-11-14 Guy Bardet Unité de production de flux laminaire stérile à circulation verticale
EP0326726A1 (fr) * 1988-02-02 1989-08-09 Hirayama Setsubi Kabushiki Kaisha Système de salle blanche et unité modulaire pour le même système de salle blanche
US4873914A (en) * 1988-02-02 1989-10-17 Hirayama Setsubi Kabushiki Kaisha Clean room system and unit for the same clean room system
GB2278771A (en) * 1993-06-10 1994-12-14 Ma Thomas Tsoi Hei Extracting airborne dust
FR2785370A1 (fr) * 1998-11-04 2000-05-05 Ensmse Dispositif et procede de traitement d'air realisant une isolation par rideau d'air
EP1161897A1 (fr) * 2000-06-06 2001-12-12 Finnfuture OY Guichet pour restaurants et un procédé pour son utilisation
WO2002093082A1 (fr) * 2001-05-14 2002-11-21 Acanthe Sarl Procede et dispositif pour diffuser un flux de protection a l'egard d'une ambiance environnante
US7297050B2 (en) 2001-05-14 2007-11-20 Acanthe Method and device for diffusing a protective flux with regard to a surrounding environment
DE20111081U1 (de) 2001-07-06 2001-10-04 Clean-Tek GmbH Systemteile zum Bau von technischen Räumen, 71272 Renningen Befestigungsvorrichtung für eine Filter-Ventilatoreinheit eines Reinraumsystems
WO2003056253A1 (fr) * 2001-12-21 2003-07-10 Airinspace Limited Dispositif mobile d'isolement aeraulique
US7217186B2 (en) 2001-12-21 2007-05-15 Airinspace Limited Mobile aeraulic isolation device against airborne contamination with variable geometry air diffuser
FR2833844A1 (fr) * 2001-12-21 2003-06-27 Airinspace Ltd Dispositif mobile d'isolement aeraulique contre la contamination aeroportee, a geometrie variable de diffusseur d'air
EP1918653A3 (fr) * 2002-09-04 2008-08-27 Johnson Medical Development Pte Ltd Système, dispositif et procédé de ventilation
GB2436448A (en) * 2006-03-17 2007-09-26 Extract Technology Ltd Containment assembly comprising an operator booth with downward recirculatory airflow
GB2436448B (en) * 2006-03-17 2011-06-22 Extract Technology Ltd Assembly
GB2480884A (en) * 2010-06-05 2011-12-07 Thermoscreens Ltd Air Curtain Discharge Device
WO2021197521A1 (fr) * 2020-04-04 2021-10-07 Dirk Barnstedt Système de ventilation de postes de travail individuels pour éviter des infections par gouttelettes
US11859864B1 (en) * 2020-05-18 2024-01-02 Wunderlich-Malec Engineering, Inc. Particulate and virus barrier
GB2604179A (en) * 2021-02-26 2022-08-31 Perseptive Ltd Air curtain surrounding a hospital bed
WO2022180288A1 (fr) * 2021-02-26 2022-09-01 Universidad De Valladolid Système de protection contre la contagion de virus au niveau de postes de travail de bureau
ES2922152A1 (es) * 2021-02-26 2022-09-09 Univ Valladolid Sistema de proteccion contra el contagio de virus en puestos de trabajo de oficina
EP4080127A3 (fr) * 2021-04-20 2023-02-22 FLOWGenuity Inc. Système de création d'un micro-environnement dans un environnement ambiant

Also Published As

Publication number Publication date
EP0183709A1 (fr) 1986-06-11
AU4110585A (en) 1985-10-11

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