US3859900A - Air curtain system - Google Patents

Air curtain system Download PDF

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Publication number
US3859900A
US3859900A US330712A US33071273A US3859900A US 3859900 A US3859900 A US 3859900A US 330712 A US330712 A US 330712A US 33071273 A US33071273 A US 33071273A US 3859900 A US3859900 A US 3859900A
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United States
Prior art keywords
air
pair
door opening
blower
adjacent
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Expired - Lifetime
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US330712A
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English (en)
Inventor
Marc Fordsmand
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Individual
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Individual
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Publication of US3859900A publication Critical patent/US3859900A/en
Anticipated expiration legal-status Critical
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    • 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

Definitions

  • An air curtain in the form of a cyclone is generated in an air chamber adjacent a door opening and comprising a ceiling and a pair of side walls extending at right angles to the door opening at either side thereof.
  • the air cyclone is generated by one or a pair of blower units in the shape of an elongated cabinet having substantially the same length and height as the air chamber and being disposed adjacent one or both side walls thereof.
  • Each blower unit includes a blower mounted on a partition within the cabinet dividing the same into a suction chamber communicating with an air intake aperture extending in the full height of the cabinet and a pressure chamber communicating with a pair of exhaust apertures likewise extending in the full height of the cabinet.
  • the blower units are arranged in the air chamber, so as to generate air currents at either end thereof in the transverse direction of the air chamber suitable for setting up a cyclone-whirl air curtain therein.
  • This invention relates to a system for generating an air curtain behind a door opening in a room, so as to prevent or very substantially reduce air currents flowing through the door opening into the room or from the room to the exterior.
  • the main object of the invention is to provide means for increasing the stability and efficiency of air curtains of the kind referred to.
  • a further object of the invention is to provide a blower unit suitable for setting up a stable and efficient air curtain behind a door opening, said blower unit being made as an article of manufacture ready to be installed adjacent the door opening, neatly and inconspicuously arranged therebehind and without requiring any air ducts or other constructional modifications in or near the doorway.
  • FIG. 1 is an elevation partly in section showing a blower unit according to the invention
  • FIG. 2 is a cross section taken substantially on line II-II in FIG. 1,
  • FIG. 3 is a perspective view of an air chamber arranged behind a door opening for setting up an air curtain
  • FIG. 4 is a schematic plan view showing the flow of air currents within the air chamber of FIG. 3 for setting up an air curtain therein, and
  • FIG. 5 is a schematic plan view similar to FIG. 4 showing air flows in an air chamber comprising one blower unit.
  • numeral 1 indicates a blower unit in the form of a cabinet having a front wall 2a and 2b, end walls 3 and 4, a back wall 5, a bottom wall 6 and a top wall 7.
  • the interior of this cabinet which may be made of steel sheets or any other suitable material is divided by a partition 13 into two main chambers, viz. an air intake chamber 10 and a pressure chamber 20.
  • An air intake slot 11 is provided in the portion 2a of the front wall adjacent the end wall 3 and extends vertically substantially throughout the entire height of the cabinet.
  • An air filter 12 is located in the intake chamber 10 adjacent the slot 11.
  • An aperture 15 is provided in the partition 13, and a centrifugal blower 14 is mounted on the partition 13, the exhaust side of which communicates with the aperture 15, so as to enable air passing through the slot 11, filter 12 and the intake or suction chamber 10 to be blown into the pressure chamber 20.
  • a second partition 22 comprising a plurality of perforations, and a heating or cooling element 23 extending substantially'throughout the entire height of the cabinet is mounted on the partition 22, which provides for an even distribution of the air pressure in the portion of the pressure chamber 20 adjacent the end wall 4.
  • a pair of exhaust slots 21a and 21b extending substantially throughout the entire height of the cabinet.
  • the inner surface ofthe walls of the cabinet is provided with a lining 16 ofa suitable sound damping material adapted to ensure a substantially noiseless operation of the blower unit.
  • the numeral generally indicates an air chamber located behind an outer wall 31 having a door opening 3 2.
  • This air chamber which is provided for the purpose of generating an air whirl in the interior thereof is defined by a floor 33, a top wall or ceiling 34 andside walls 35a and 35b, and a blower unit as shown in FIGS. 1 and 2 is arranged in the air chamber 30 along each of the side walls 35a and 351), the arrangement being such that the height of each of the cabinets 1A and 1B is substantially equal to the height of the air chamber, and the lengths of the cabi-, nets is substantially equal to the length of the side walls 35a and 35b.
  • the two cabinets are positioned in such a manner that the exhaust slots 21a and 21b of one cabinet are located opposite the intake slot 11 of the other cabinet.
  • the blower units when in operation, will set up air currents as illustrated by the arrows in FIG. 4.
  • the exhaust currents 41a and 41b generated by the blower unit 1A adjacent side wall 35a will flow across the door opening 32 towards the intake slot 11 of the other unit 1B. It has been found that when using two exhaust slots 21a and 21b instead of one, the corresponding air currents 41a and 4lb will have a tendency of converging on their way across the door opening which will result in increased stability of the resulting air flow 41c.
  • a relatively small portion 42 of the air flow will tend to pass out through the door opening 32, and although this portion does not directly contribute to the generation of an air whirl 40 in the interior of the air chamber, it will nevertheless be useful in that it will counteract an inflow of air through the door opening, thereby contributing to the stabilization of the rotating currents in the air chamber 30.
  • This rotational movement of the air volume within the air chamber is enhanced by the exhaust currents 41.a and 4l'b from the blower unit 18 resulting in the rotating air curtain 43 generating the whirl 40 therein. It will be understood that due to the depression inside the cyclone 43 this air curtain will efficiently prevent draught currents from passing through the air chamber.
  • FIG. 5 which is a schematic plan view similar to FIG. 4, this figure shows a simplified embodiment of the air chamber comprising only one blower unit located adjacent the side wall 35a and having a screen wall 36 extending at right angle to the side wall 35b.
  • a slideable glass door 37 may be arranged adjacent the door opening 32, preferably of the type which automatically opens when a person approaches the door opening from the outside.
  • a similar door arrangement may also be provided in the embodiment shown in FIGS. 3 and 4.
  • the generation of the cyclone 43 may be greater speed than that of the unit 18.
  • An air curtain system comprising a room having an outer wall and a door opening therein, an air chamber intermediate said door opening and said room and having a floor, a ceiling, and a pair of side walls extending from the door opening into the room at right angles to the outer wall, and at least one blower unit adjacent one side wall of said air chamber, said blower unit extending in a horizontal direction substantially through the entire length of the air chamber and extending in a vertical direction substantially from the floor to the ceiling, and comprising an elongated cabinet of substantially rectangular cross section having bottom and top walls, a pair of side walls and a pair of end walls, cyclone means for developing a cyclone of air in said air chamber, said cyclone meanscomprising an air intake aperture in one of said side walls adjacent one of said end walls, and a pair of exhaust apertures in said side wall adjacent the other end wall, spaced in a horizontal direction from said intake aperture by a distance so that the air traveling from said exhaust apertures interacts with the air traveling to said intake aperture so as to form said
  • each of said blower units comprises at least one exhaust slot adjacent one end thereof and one intake slot adjacent the other end thereof, the arrangement of said blower units being such that the exhaust aperture of one unit is located opposite the intake slot of the other unit.
  • An air curtain system as recited in claim 1, wherein a first blower unit is disposed along one side wall of the air chamber having a pair of exhaust apertures located adjacent the door opening, wherein a second blower unit is disposed along the other side wall of the air chamber having its intake aperture located adjacent the door opening substantially in alignment with the exhaust apertures of said first blower unit, and wherein said first blower unit operates at a higher speed than said second blower unit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US330712A 1972-02-11 1973-02-08 Air curtain system Expired - Lifetime US3859900A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK62372 1972-02-11

Publications (1)

Publication Number Publication Date
US3859900A true US3859900A (en) 1975-01-14

Family

ID=8095673

Family Applications (1)

Application Number Title Priority Date Filing Date
US330712A Expired - Lifetime US3859900A (en) 1972-02-11 1973-02-08 Air curtain system

Country Status (4)

Country Link
US (1) US3859900A (enExample)
CH (1) CH546930A (enExample)
DE (1) DE2305923A1 (enExample)
FR (1) FR2171411B3 (enExample)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308809A (en) * 1977-10-20 1982-01-05 Woods Maurice G Solid waste disposal system
USD264751S (en) 1980-04-14 1982-06-01 Hcr Incorporated Conditioned air vestibule
EP0058782A1 (en) * 1981-02-24 1982-09-01 Stichting Ontwikkeling Koeltechniek Cold-storage building
US4409743A (en) * 1978-11-27 1983-10-18 Knud Jespersen Perforated walls and duct system
GB2151349A (en) * 1983-12-23 1985-07-17 Marco Zambolin An air curtain for eliminating the infiltration of cold air through entrances of industrial buildings
US4823680A (en) * 1987-12-07 1989-04-25 Union Carbide Corporation Wide laminar fluid doors
US5988434A (en) * 1992-11-12 1999-11-23 Merz & Co. Gmbh & Co. Kg Dosage withdrawal apparatus
US6595429B1 (en) 2002-04-03 2003-07-22 Asi Technologies, Inc. Apparatus and method for providing continuous real-time conditioned air curtain
US20040003617A1 (en) * 2002-05-17 2004-01-08 Chandler Michael S. Device and method for creating a horizontal air curtain for a cooler
US7819729B2 (en) 2004-03-02 2010-10-26 Asi Technologies, Inc. Air curtain doorway
US20130276891A1 (en) * 2012-04-19 2013-10-24 Xerox Corporation Cooling flow accelerator
US20130280999A1 (en) * 2011-03-14 2013-10-24 Fuji Electric Co., Ltd Air conditioning system using outside air
RU198276U1 (ru) * 2019-11-21 2020-06-29 Сергей Анатольевич Лысцев Завеса воздушная
IT201900011145A1 (it) * 2019-07-08 2021-01-08 B Projet S R L Dispositivo per la generazione di una barriera a lama d'aria

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7803010L (sv) * 1978-03-15 1979-09-16 Bahco Ventilation Ab Sett och anordning vid portoppning
WO1982002934A1 (en) * 1981-02-24 1982-09-02 Vahl Laszlo Cold-storage building
DE3403547C2 (de) * 1984-02-02 1986-11-13 Kessler & Luch Gmbh, 6300 Giessen Luftschleuse in einem Gebäudeeingang
DE3424934A1 (de) * 1984-07-06 1986-01-16 Volvo Car B.V., Helmond Fluessigkeitsdaempfer fuer einen kraftstoffbehaelter
DE3604422A1 (de) * 1986-02-13 1987-08-20 Kessler & Luch Gmbh Vorrichtung zum saeubern kontaminierter oberflaechen mittels stroemender luft
JPS62261842A (ja) * 1986-05-09 1987-11-14 Nippon Air Curtain Kk 人工竜巻発生機構とその利用法
DE102010061007A1 (de) 2010-04-29 2011-11-03 Teddington Luftschleieranlagen Gmbh Anordnung zur Abschottung eines Vorraums oder Windfangs
DE202017002789U1 (de) 2017-05-17 2018-08-21 Dirk Barnstedt Vorrichtung zur Bildung eines Hohlraums mit einem Sperrgas-Gürtel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3023688A (en) * 1958-05-16 1962-03-06 Jr Fred A Kramer Air barrier
US3143952A (en) * 1960-08-24 1964-08-11 Dualjet Corp Method and apparatus for conditioning gas
US3350994A (en) * 1965-10-23 1967-11-07 Guibert Raul Air curtain, ventilating system and air pump therefor
US3394755A (en) * 1967-02-06 1968-07-30 Conditionaire Australia Pty Lt Air screen creating-air conditioning apparatus
US3543532A (en) * 1968-11-25 1970-12-01 Streater Ind Inc Air return grille for an air curtain type refrigerated display case

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3023688A (en) * 1958-05-16 1962-03-06 Jr Fred A Kramer Air barrier
US3143952A (en) * 1960-08-24 1964-08-11 Dualjet Corp Method and apparatus for conditioning gas
US3350994A (en) * 1965-10-23 1967-11-07 Guibert Raul Air curtain, ventilating system and air pump therefor
US3394755A (en) * 1967-02-06 1968-07-30 Conditionaire Australia Pty Lt Air screen creating-air conditioning apparatus
US3543532A (en) * 1968-11-25 1970-12-01 Streater Ind Inc Air return grille for an air curtain type refrigerated display case

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4308809A (en) * 1977-10-20 1982-01-05 Woods Maurice G Solid waste disposal system
US4409743A (en) * 1978-11-27 1983-10-18 Knud Jespersen Perforated walls and duct system
USD264751S (en) 1980-04-14 1982-06-01 Hcr Incorporated Conditioned air vestibule
EP0058782A1 (en) * 1981-02-24 1982-09-01 Stichting Ontwikkeling Koeltechniek Cold-storage building
GB2151349A (en) * 1983-12-23 1985-07-17 Marco Zambolin An air curtain for eliminating the infiltration of cold air through entrances of industrial buildings
US4823680A (en) * 1987-12-07 1989-04-25 Union Carbide Corporation Wide laminar fluid doors
US5988434A (en) * 1992-11-12 1999-11-23 Merz & Co. Gmbh & Co. Kg Dosage withdrawal apparatus
US6595429B1 (en) 2002-04-03 2003-07-22 Asi Technologies, Inc. Apparatus and method for providing continuous real-time conditioned air curtain
US20040003617A1 (en) * 2002-05-17 2004-01-08 Chandler Michael S. Device and method for creating a horizontal air curtain for a cooler
US6874331B2 (en) * 2002-05-17 2005-04-05 Manitowoc Foodservice Companies, Inc. Device and method for creating a horizontal air curtain for a cooler
US7819729B2 (en) 2004-03-02 2010-10-26 Asi Technologies, Inc. Air curtain doorway
US20130280999A1 (en) * 2011-03-14 2013-10-24 Fuji Electric Co., Ltd Air conditioning system using outside air
US9605855B2 (en) * 2011-03-14 2017-03-28 Fuji Electric Co., Ltd. Air conditioning system using outside air
US20130276891A1 (en) * 2012-04-19 2013-10-24 Xerox Corporation Cooling flow accelerator
US9148978B2 (en) * 2012-04-19 2015-09-29 Xerox Corporation Cooling flow accelerator
IT201900011145A1 (it) * 2019-07-08 2021-01-08 B Projet S R L Dispositivo per la generazione di una barriera a lama d'aria
EP3764006A1 (en) * 2019-07-08 2021-01-13 B.PROJET S.r.l. Device for generating an air blade barrier
RU198276U1 (ru) * 2019-11-21 2020-06-29 Сергей Анатольевич Лысцев Завеса воздушная

Also Published As

Publication number Publication date
CH546930A (de) 1974-03-15
FR2171411B3 (enExample) 1976-02-06
DE2305923A1 (de) 1973-08-16
FR2171411A1 (enExample) 1973-09-21

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