EP0510637A2 - Procédé et dispositif d'aération pour un espace de traitement - Google Patents

Procédé et dispositif d'aération pour un espace de traitement Download PDF

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Publication number
EP0510637A2
EP0510637A2 EP92106942A EP92106942A EP0510637A2 EP 0510637 A2 EP0510637 A2 EP 0510637A2 EP 92106942 A EP92106942 A EP 92106942A EP 92106942 A EP92106942 A EP 92106942A EP 0510637 A2 EP0510637 A2 EP 0510637A2
Authority
EP
European Patent Office
Prior art keywords
processing space
air
supply air
opening
flows
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.)
Granted
Application number
EP92106942A
Other languages
German (de)
English (en)
Other versions
EP0510637B1 (fr
EP0510637A3 (en
Inventor
Seppo Leskinen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Flaekt Woods Oy
Original Assignee
ABB Flaekt Oy
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Filing date
Publication date
Application filed by ABB Flaekt Oy filed Critical ABB Flaekt Oy
Publication of EP0510637A2 publication Critical patent/EP0510637A2/fr
Publication of EP0510637A3 publication Critical patent/EP0510637A3/en
Application granted granted Critical
Publication of EP0510637B1 publication Critical patent/EP0510637B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • Laminar cabinets thus operate appropriately only when the temperature of the supply air and also that of the cabinet is equal to the temperature of air surrounding the cabinet. If the temperature of the supply air and that of the surrounding air differ from each other, convection flows occur due to the density differences of the air and totally change the flows within and around the cabinet.
  • German Offenlegungsschrift 2 245 265 suggests that the air jet providing the air curtain should be divided between two nozzles, which can be directed. Due to induction, the jets, however, join rapidly, whereafter the two jets are no longer of any use. In place of several expected small induction flow turbulences, one large turbulence is created on both sides of the jet. Due to the temperature differences, the air tends to flow outward from the upper portion of the door and inward from its lower portion, so that the system, in fact, increases the influence of convection flows instead of decreasing it.
  • European Patent Application 0 139 128 describes a laminar cabinet, which, however, does not comprise two zones but an air curtain in which the air is blown downward or sideward in parallel with the laminar flow.
  • the basic idea is that instead of the air circulating in the cabinet and possibly containing poisonous gases, the surrounding air containing no such gases is used in the air jet. In this way, the escape of the gases is prevented.
  • the purpose of the laminar flow in the cabinet in this case as well as in laminar cabinets in general is to keep the particles of the surrounding air away from the cabinet. Thus no circulation flow is created, and one attempts to avoid its creation.
  • Finnish Patent Specification 80778 describes a flow field created in a free space by an air jet technique.
  • the air is blown at an angle of 90° from nozzles positioned in two rows.
  • One does not attempt to affect the convection flows.
  • the object is an even, downwardly directed "air bed", in which mixing with the surrounding air is insignificant.
  • an air flow blown downward drops if the air in the flow is clearly colder than the air contained in the large room space. If it is clearly warmer, the flow remains on the ceiling level, turns 90° on reaching the wall of the room space and passes further along the ceiling in the direction of the room. If the temperature of the air flow is substantially equal to that of the air contained in the room space, the flow is divided into two branches, turns 90° in the horizontal plane already before reaching the wall of the room space and simultaneously turns 90° in the vertical plane. The end result is that the air flow passes downward at the corners of the air supply means.
  • the air distribution device has no noticeable effect on the thermal flows in the large room space.
  • German Offenlegungsschrifts 2 305 101 and 2 359 218 describe methods of providing air curtains in large access openings, such as door openings on the floor level in large production spaces and other similar room spaces to prevent the escape of warm room air. In these methods the air is blown outward from the room space and the blowing and the circulation flow are parallel with the convection flows.
  • the object of the present invention is to provide a method which avoids the above-mentioned disadvantages and enables a processing space to be separated efficiently by means of an air curtain even when the temperature difference between the supply air and the surroundings is as great as 10° and even more.
  • This object is achieved by means of a method according to the invention, which is characterized in that the supply air is blown into the processing space in such a way that a free circulation flow is created in the processing space under the influence of the air jet, the direction of the free circulation flow at a lower edge of the access opening being substantially opposite to the direction of convection flows of surrounding air created by a temperature difference between the introduced supply air and the surrounding air, and the flow rate of the circulation flow being greater than the flow rate of the convection flows at the access opening.
  • the method according to the invention enables cooled and heated areas to be separated from a large production space, a room or other such space in accordance with the requirements of the production process.
  • the entire production space need not be cooled or heated to a temperature required for a specific work stage, the demand of cooling or heating energy decreases and the investments required for producing the energy are decisively reduced.
  • air within the cooled or heated area can also be kept extremely clean without filtering the entire air flow required for air-conditioning the production space.
  • air impurities possibly formed in the production space are not able to enter the production line.
  • the product hygiene can thus be decisively improved with low costs.
  • the system also eliminates the health hazards of the workers and the working conditions are considerably improved, which improves the productivity of work considerably.
  • Convection flows and leakages of cold/warm air caused by such flows are prevented by creating a circulation flow in the separated processing space, the direction of which is against the convection flows and the flow rate is greater than that of the convection flows.
  • the flow is obtained by shaping the separated space so that a circulation flow is able to develop efficiently and by blowing the supply air into the space through a narrow continuous nozzle having the same width as the opening or wall or through small nozzles or openings positioned close to each other in one or more rows, so that a circulation flow is achieved.
  • the invention also relates to an equipment for applying the method described above.
  • the equipment is characterized in that the means for introducing the supply air are positioned in the processing space in such a way that the supply air flows in the processing space as a free circulation flow having a direction opposite to the direction of convection flows of surrounding air caused by temperature differences between the supply air and the surrounding air, and having a flow rate greater than the flow rate of the convection flows of the surrounding air at a lower edge of the access opening.
  • the equipment provides, with very simple means, the advantages described in connection with the method.
  • FIG. 1 illustrates a known ventilation arrangement.
  • a processing space 1 is surrounded by a cabinet 2 having an access opening 3 on one side. Cooled supply air A is blown through nozzles 4 provided at the ceiling of the cabinet in order to form an air curtain 5 within the area of the opening.
  • a desired flow of the supply air at the opening of the processing space is shown by arrows A'' drawn by broken lines.
  • surrounding warmer room air flows into the cabinet at the upper edge of the opening as convection flows B, and mixes with the supply air, the flow of which is shown by arrows A' drawn by solid lines. This air flows along the bottom of the cabinet and over the open front edge and further down to the floor level.
  • the known arrangements usually comprise a perforated top plate or a filter cell or some other similar planar air distribution device, through which air flows at a low rate so as to obtain a laminar flow.
  • the object is to achieve an even, slow flow over the entire cross-sectional area of the opening.
  • the air flow rate is low, e.g. 0.05 to 0.4 m/s.
  • a supply duct 6 is provided adjacent to a lower edge 2a of the opening 3 of the cabinet.
  • the duct 6 is provided with nozzles 7 directed in parallel with a bottom 2b of the cabinet. Cooled supply air A is blown into the processing space through the nozzles at a high rate.
  • a supply air flow A' passes from below via a back wall 2c of the cabinet up to a ceiling 2d and along it to a front wall 2e and further downward across the opening of the cabinet as a natural flow (cold air flows downward).
  • the initial flow rate of the supply air is so high that the circulation flow described above remains in the cabinet, and no warmer room air enters the cabinet as a convection flow B at the upper edge of the opening, unlike in Figure 1.
  • the height of the cabinet and the opening should not be considerably greater than the width, as otherwise two superimposed circulation flows easily result, of which the upper flow is open so that warm air flows into the cabinet at the upper edge of the opening while cold air flows out in the middle.
  • This can be prevented by means of a duct 8 positioned at the upper edge of the opening and having nozzles 9 through which air is blown downward, as shown in Figure 3. In this way, it is possible to control even relatively high openings.
  • the air blown through the nozzles 9 is circulation air C sucked into a duct 10 provided at the back 2c of the cabinet and returned through the duct 8 into the circulation flow A'.
  • a relatively reliable way of preventing the splitting of the circulation flow A' into two is to position a duct 11 at the top of the cabinet, as shown in Figure 4, and introduce supply air through small nozzles 12 positioned in several rows.
  • a double turbulence A', A'' is thus formed within the cabinet, as shown in Figure 4, in which air flows downward on both sides and upward in the middle.
  • the circulation flow can be ensured by blowing air in parallel with the bottom of the cabinet while taking circulation air C through the duct 10. Neither one of the last-mentioned functions is needed in all cases.
  • This way of ventilation as well as that shown in Figure 5 is especially suitable for use when both side walls of the cabinet or production line are open.
  • the nozzles 6 thereby blow against each other from the opposite sides of the cabinet or the production line, and the duct 10 is positioned in the middle of the cabinet or production line.
  • Figure 5 shows an embodiment in which supply air is blown through the duct 11 provided at the top of the cabinet in two directions through nozzles 12 positioned in several rows.
  • This arrangement is particularly suitable for use in large processing spaces, since the jets remain strong on the surface of the cabinet for a long time due to the so-called Coanda phenomenon.
  • Figure 3A is an enlarged view of an alternative structure for the air supply arrangement shown in Figure 2.
  • Figure 3A the same reference numerals as in Figure 2 are used.
  • Figure 3B is an enlarged view of an alternative structure for the additional air circulation arrangement shown in Figure 2.
  • Figure 3B the same reference numerals as in Figure 2 are used.
  • guide plates 2g to 2m for guiding the flow may be provided in the processing space 1.
  • the guide plates 2g to 2m can be positioned close to the walls of the processing space. They may also be formed by portions of the walls or the ducts.
  • the cabinet of the processing space may comprise plates or other means accelerating or directing the circulation flow of supply air and directing or preventing the convection flow of surrounding air at points where the convection flow tends to enter the circulation flow. It is also possible to provide nozzle blows at various points of the cabinet; in Figure 3, for instance, the duct 8 can thus be positioned at the top of the cabinet, so that the nozzles 9 blow along the front wall 2e. In the embodiment of Figure 2, a further duct having nozzles blowing upward along the wall 2c can be provided in the lower portion of the back wall 2c.
  • the duct 8 shown in Figure 3 can be added, or a duct having nozzles blowing upward can be provided centrally below the duct 11, etc.
  • a stationary processing space such as a laboratory cabinet
  • the opening(s) to be closed by an air curtain may be the access opening(s) of a moving conveyor.
  • the supply air can be kept colder, warmer, cleaner or in a condition otherwise deviating from the surrounding air, and blown as a circulation flow according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ventilation (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Air-Flow Control Members (AREA)
EP92106942A 1991-04-23 1992-04-23 Procédé et dispositif d'aération pour un espace de traitement Expired - Lifetime EP0510637B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI911968A FI88541C (fi) 1991-04-23 1991-04-23 Foerfarande och anordning foer att aostadkomma en luftvaexling foer ett behandlingsrum
FI911968 1991-04-23

Publications (3)

Publication Number Publication Date
EP0510637A2 true EP0510637A2 (fr) 1992-10-28
EP0510637A3 EP0510637A3 (en) 1993-06-30
EP0510637B1 EP0510637B1 (fr) 1995-12-27

Family

ID=8532380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92106942A Expired - Lifetime EP0510637B1 (fr) 1991-04-23 1992-04-23 Procédé et dispositif d'aération pour un espace de traitement

Country Status (6)

Country Link
EP (1) EP0510637B1 (fr)
AT (1) ATE132244T1 (fr)
DE (1) DE69207056T2 (fr)
DK (1) DK0510637T3 (fr)
FI (1) FI88541C (fr)
NO (1) NO175226C (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993016334A1 (fr) * 1992-02-18 1993-08-19 ABB Fläkt Oy Procede et installation pour assurer une circulation d'air dans un espace de traitement
ES2040154A1 (es) * 1991-03-06 1993-10-01 Sanchez Sanchez Francisca Horno de aire a conveccion sin puerta.
WO1996032613A1 (fr) * 1995-04-14 1996-10-17 Ultra Propre Nutrition Industrie Recherche (U.N.I.R.) Dispositif de protection anti-contamination rapprochee
FR2750199A1 (fr) * 1996-06-21 1997-12-26 Cemagref Centre National Du Ma Procede et dispositif de protection rapprochee d'un plan de travail au moyen d'un flux d'air propre
EP0867665A3 (fr) * 1997-03-27 2000-04-12 GWE Gesellschaft für Wasseraufbereitung und Energierückgewinnung mbH Méthode pour améliorer la circulation d'air dans une cabine d'air propre
US6821062B2 (en) 2001-09-18 2004-11-23 Robert Bosch Gmbh Device for processing a workpiece
JP2017161167A (ja) * 2016-03-09 2017-09-14 パナソニックＩｐマネジメント株式会社 空調システム
WO2018122304A1 (fr) * 2016-12-29 2018-07-05 Waldner Laboreinrichtungen Gmbh & Co. Kg Sorbonne présentant un guidage des jets en paroi
WO2018122302A1 (fr) * 2016-12-29 2018-07-05 Waldner Laboreinrichtungen Gmbh & Co. Kg Sorbonne de laboratoire à jets de paroi

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140020686A1 (en) * 2011-04-06 2014-01-23 Airsonnet Ab Temperature Controlled Laminair Air Flow Device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1120104B (de) * 1959-07-24 1961-12-21 Schilde Maschb Ag Abschirmung eines Raumes durch einen Luftschleier
US3251177A (en) * 1963-05-15 1966-05-17 Arthur K Baker Dust-free bench
DE2305101A1 (de) * 1973-02-02 1974-08-08 Buettner Schilde Haas Ag Abschirmung eines raumes durch einen luftschleier
DE8712461U1 (de) * 1987-09-15 1987-12-03 GWE Gesellschaft für Wasseraufbereitung und Energierückgewinnung mbH, 2872 Hude Arbeitstisch
WO1991005210A1 (fr) * 1989-10-02 1991-04-18 Societe Generale Pour Les Techniques Nouvelles Sgn Procede et dispositif pour maintenir une atmosphere propre a temperature regulee sur un poste de travail

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1120104B (de) * 1959-07-24 1961-12-21 Schilde Maschb Ag Abschirmung eines Raumes durch einen Luftschleier
US3251177A (en) * 1963-05-15 1966-05-17 Arthur K Baker Dust-free bench
DE2305101A1 (de) * 1973-02-02 1974-08-08 Buettner Schilde Haas Ag Abschirmung eines raumes durch einen luftschleier
DE8712461U1 (de) * 1987-09-15 1987-12-03 GWE Gesellschaft für Wasseraufbereitung und Energierückgewinnung mbH, 2872 Hude Arbeitstisch
WO1991005210A1 (fr) * 1989-10-02 1991-04-18 Societe Generale Pour Les Techniques Nouvelles Sgn Procede et dispositif pour maintenir une atmosphere propre a temperature regulee sur un poste de travail

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2040154A1 (es) * 1991-03-06 1993-10-01 Sanchez Sanchez Francisca Horno de aire a conveccion sin puerta.
WO1993016334A1 (fr) * 1992-02-18 1993-08-19 ABB Fläkt Oy Procede et installation pour assurer une circulation d'air dans un espace de traitement
US6035549A (en) * 1995-04-14 2000-03-14 Ultra Propre Nutrition Industrie Recherche (U.N.I.R.) Close contamination protection device and method thereof for food
FR2733036A1 (fr) * 1995-04-14 1996-10-18 Unir Dispositif de protection anti-contamination rapprochee
WO1996032613A1 (fr) * 1995-04-14 1996-10-17 Ultra Propre Nutrition Industrie Recherche (U.N.I.R.) Dispositif de protection anti-contamination rapprochee
FR2750199A1 (fr) * 1996-06-21 1997-12-26 Cemagref Centre National Du Ma Procede et dispositif de protection rapprochee d'un plan de travail au moyen d'un flux d'air propre
WO1997049955A1 (fr) * 1996-06-21 1997-12-31 U.N.I.R. Ultra Propre-Nutrition Industrie-Recherche Procede et dispositif de protection d'un plan de travail
US6095918A (en) * 1996-06-21 2000-08-01 N.I.R. Ultra Propre-Nutrition Industrie Recherche Method and device for protecting a work surface
EP0867665A3 (fr) * 1997-03-27 2000-04-12 GWE Gesellschaft für Wasseraufbereitung und Energierückgewinnung mbH Méthode pour améliorer la circulation d'air dans une cabine d'air propre
US6821062B2 (en) 2001-09-18 2004-11-23 Robert Bosch Gmbh Device for processing a workpiece
JP2017161167A (ja) * 2016-03-09 2017-09-14 パナソニックＩｐマネジメント株式会社 空調システム
WO2018122304A1 (fr) * 2016-12-29 2018-07-05 Waldner Laboreinrichtungen Gmbh & Co. Kg Sorbonne présentant un guidage des jets en paroi
WO2018122302A1 (fr) * 2016-12-29 2018-07-05 Waldner Laboreinrichtungen Gmbh & Co. Kg Sorbonne de laboratoire à jets de paroi
JP2018108568A (ja) * 2016-12-29 2018-07-12 バルドナー ラボラインリヒトゥンゲン ゲーエムベーハー ウント ツェーオー．カーゲーＷａｌｄｎｅｒ Ｌａｂｏｒｅｉｎｒｉｃｈｔｕｎｇｅｎ ＧｍｂＨ ＆ Ｃｏ． ＫＧ 壁面噴流を持つドラフトチャンバ

Also Published As

Publication number Publication date
NO175226B (fr) 1994-06-06
ATE132244T1 (de) 1996-01-15
NO921557D0 (no) 1992-04-22
EP0510637B1 (fr) 1995-12-27
FI88541B (fi) 1993-02-15
DK0510637T3 (da) 1996-01-29
FI911968A (fi) 1992-10-24
NO175226C (no) 1994-09-14
DE69207056T2 (de) 1996-06-05
FI911968A0 (fi) 1991-04-23
FI88541C (fi) 1993-05-25
NO921557L (no) 1992-10-26
EP0510637A3 (en) 1993-06-30
DE69207056D1 (de) 1996-02-08

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