EP0626056A1 - Procede et installation pour assurer une circulation d'air dans un espace de traitement. - Google Patents

Procede et installation pour assurer une circulation d'air dans un espace de traitement.

Info

Publication number
EP0626056A1
EP0626056A1 EP93917403A EP93917403A EP0626056A1 EP 0626056 A1 EP0626056 A1 EP 0626056A1 EP 93917403 A EP93917403 A EP 93917403A EP 93917403 A EP93917403 A EP 93917403A EP 0626056 A1 EP0626056 A1 EP 0626056A1
Authority
EP
European Patent Office
Prior art keywords
treatment space
air flow
working area
duct
flow
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
EP93917403A
Other languages
German (de)
English (en)
Other versions
EP0626056B1 (fr
Inventor
Tytti Katariina Jaervinen
Seppo Juhani 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
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 ABB Flaekt Oy filed Critical ABB Flaekt Oy
Publication of EP0626056A1 publication Critical patent/EP0626056A1/fr
Application granted granted Critical
Publication of EP0626056B1 publication Critical patent/EP0626056B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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

  • the present invention relates to a method of providing a circulating air flow in a treatment space separated from the surroundings for a production line, a working area or the like, whereby inlet air is blown into the treatment space to form a circulat ⁇ ing air flow in the treatment space, which flow pro- vides an air curtain at an open access opening to the treatment space to prevent entrance of ambient air.
  • the object of the present invention is to pro ⁇ vide a method by means of which flow losses caused by a workpiece in the treatment space are eliminated al- most entirely and the working conditions are improved remarkably.
  • This object is achieved by means of the method according to the invention, which is charac ⁇ terized in that at least a part of the circulating air flow is deflected from the working area in such a manner that the working area remains essentially within the circulating air flow.
  • the basic idea of the invention is that a part of the circulating air flow directed towards the workpiece in the treatment space is caused to flow past the workpiece outside the actual working area in such a way that the workpiece remains in the middle of the circulating flow or at least within the range of a low flow rate. In this manner it is possible to eliminate essentially the disturbing influence of the workpiece on the circulating flow, which improves the working conditions. At the same time, the rate of the air flow is reduced within the working area to a fraction of the respective rate in the known systems.
  • the invention also relates to an arrangement for carrying out the method described above, in which the treatment space comprises means for blowing inlet air supplied ' from outside the space or from the very space into the treatment space in such a manner that the inlet air forms an air flow circulating in the treatment space, which flow provides an air curtain at the access opening to prevent entrance of ambient air.
  • the arrangement is characterized in that a duct passing the working area is formed in the treatment space at least for a part of the circulating air flow.
  • Figure 1 shows schematically a sectional eleva ⁇ tion of a treatment space, comprising a circulating air flow according to an embodiment of the method of the invention
  • Figure 2 shows in the same way a treatment space, in which the circulating air flow has been provided according to an alternative embodiment of the invention.
  • Figure 1 shows a treatment space 1 surrounded by a cabinet 2 having a roof, walls and a bottom 2a, above which there is a working level 3 for a work ⁇ piece 4 to be treated.
  • the front wall of the cabinet has a passage, i.e. an access opening 5.
  • the walls of the cabinet are shaped to be suitable fcr a convec ⁇ tion flow.
  • nozzles 6 through which inlet air A is blown horizontally into the treatment space to- wards the back wall of the cabinet.
  • the inlet air flows along the back wall of the cabinet to the upper part of the treatment space and towards the front wall and further downwards along the front wall of the cabinet so that a vertical air curtain A' ' is formed at the access opening.
  • the initial rate of the inlet air is so high that a circulating flow A' is preserved in the treatment space and no warmer am ⁇ bient air can enter the cabinet as a convection air flow through the upper edge of the access opening.
  • the nozzles are positioned according to the in- vention below the working level 3 to blow inlet air into a passing duct 7 between the working level and the bottom 2a, so that air flows horinzontally below the working level and the workpiece supported by it.
  • An air jet from the nozzles sucks a part B of the air flow A' ' circulating in the treatment space and in ⁇ duction air from the surroundings of the cabinet through an inlet 8 at the lower edge of the access opening 5 into the passing duct. This prevents the air from escaping through the lower edge of the ac ⁇ cess opening into the surroundings and draws the main part of that part of : the circulating flow which otherwise flows horizontally along the working level towards the workpiece down into the passing duct.
  • At the rear end of the passing duct, at the back wall of the cabinet there is an outlet 9 at the height of the working level, through which outlet the circulat ⁇ ing flow is directed upwards again.
  • the rate of the flow in the passing duct is not so high as to disturb the circulating flow. It is found that the peripheral part of the circulating flow can be caused to move away from the workpiece by means of the arrangement of the invention and to pass the workpiece from below without this disturbing the cir ⁇ culating flow in the treatment space. This reduces the disturbing influence of the workpiece on the cir ⁇ culating flow and lowers the rate of the remaining circulating flow towards the workpiece above the working level. On the other hand, this improves the working conditions on the working level.
  • Disturbances can be reduced further by extend ⁇ ing the passing duct 7 and its upwards directed dis- charge outlet 9 above the working level 3, as is pre- sented by broken lines in Figure 1.
  • This is especial ⁇ ly useful when two adjacent production lines are com ⁇ bined in one cabinet with access openings 5 and noz ⁇ zles 6 on the opposite sides of the cabinet.
  • the part of the passing duct 7 directed upwards and situated in the middle of the cabinet then forms a common passing duct, by means of which the air can be di ⁇ rected upwards through the common discharge outlet 9.
  • Figure 1 shows a treatment space, in which the duct passing the circulating flow is formed between the bottom of the treatment space and the working level elevated from the bottom.
  • Figure 2 shows a sit ⁇ uation in which the passing duct is formed outside the treatment space below the bottom thereof.
  • Figure 2 shows an airtight plate 10 mounted at a distance below the bottom 2a of the treatment space, which plate prevents the circulating flow from flowing into the whole lower space 11 below the bot ⁇ tom 2a.
  • the front part of the bottom is provided with an inlet 8 into a passing duct 12 between the bottom and the plate and the rear part with an outlet 9 from the passing duct, respectively.
  • this arrangement works in the same way as described in connection with Figure 1, so that the main part of the circulating flow is caused to move through the passing duct and only a small part of the flow passes via the workpiece.
  • plates 10 it is possible to form vertical or horizon ⁇ tal guide channels also elsewhere in the treatment space, as shown by broken lines in Figure 2.
  • nozzles 13 for inlet air A are positioned inside the passing duct itself.
  • the nozzles draw also in this case the same amount of induction air through the lower edge of the access opening of the cabinet into the passing duct as in the previous embodiment.
  • Such an arrangement sometimes facilitates the problems with the position ⁇ ing of the equipments.
  • the inlet and outlet openings 8, 9 can be made smaller by providing them with guide plates 14, 15, Figure 2, when the plates are formed in such a way that they reduce the flow resistance of the openings. The outer dimensions of the treatment space will then become smaller. Guide plates can be placed also else ⁇ where.
  • auxiliary nozzles in the cases presented in Figure 1 and 2, for instance, at the upper edge of the access opening 5 nozzles blowing downwards to support the circulating flow.
  • the lower bottom of the treatment space can naturally also be the floor level of a room.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Threshing Machine Elements (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Prevention Of Fouling (AREA)

Abstract

Un procédé assurant une circulation d'air dans un espace de traitement tel qu'une zone de travail consiste à souffler de l'air frais (A) dans l'espace de traitement (1) pour former un flux d'air circulant (A') dans l'espace de traitement (1), lequel flux produit un rideau d'air (A'') à l'ouverture d'accès (5) de l'espace de traitement. Pour éliminer l'effet pertubateur de l'élément (4) en cours de traitement dans l'espace de travail (3) sur la circulation d'air et pour améliorer les conditions de travail, au moins une partie (B) de l'air circulant (A') est déviée de la zone de travail d'une manière appropriée, pour que la zone de travail reste sensiblement dans l'air circulant. Une installation de mise en oeuvre du procédé comprend une conduite (7) formée dans l'espace de traitement (1) et traversant la zone de travail (3) pour permettre le passage d'au moins une partie (B) de l'air circulant.
EP93917403A 1992-02-18 1993-01-28 Procede et installation pour assurer une circulation d'air dans un espace de traitement Expired - Lifetime EP0626056B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI920697 1992-02-18
FI920697A FI96239C (fi) 1992-02-18 1992-02-18 Menetelmä ja laitteisto kiertoilmavirtauksen aikaansaamiseksi käsittelytilaan
PCT/FI1993/000026 WO1993016334A1 (fr) 1992-02-18 1993-01-28 Procede et installation pour assurer une circulation d'air dans un espace de traitement

Publications (2)

Publication Number Publication Date
EP0626056A1 true EP0626056A1 (fr) 1994-11-30
EP0626056B1 EP0626056B1 (fr) 1997-10-08

Family

ID=8534705

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93917403A Expired - Lifetime EP0626056B1 (fr) 1992-02-18 1993-01-28 Procede et installation pour assurer une circulation d'air dans un espace de traitement

Country Status (8)

Country Link
EP (1) EP0626056B1 (fr)
AT (1) ATE159093T1 (fr)
AU (1) AU3454493A (fr)
DE (1) DE69314472T2 (fr)
ES (1) ES2107677T3 (fr)
FI (1) FI96239C (fr)
GR (1) GR3025675T3 (fr)
WO (1) WO1993016334A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5428668A (en) * 1993-11-04 1995-06-27 Ericsson Ge Mobile Communications Inc. Radio personal communications system and method for allocating frequencies for communications between a cellular terminal and a base station
DE10145921A1 (de) 2001-09-18 2003-04-03 Volkswagen Ag Vorrichtung zum Bearbeiten eines Werkstücks
US9527183B1 (en) * 2015-08-11 2016-12-27 Thermwood Corporation System for confining particulate residue in a machining operation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4936824A (en) * 1987-05-15 1990-06-26 The Boc Group, Inc. Infant incubator with air curtain
FI88541C (fi) * 1991-04-23 1993-05-25 Ilmateollisuus Oy Foerfarande och anordning foer att aostadkomma en luftvaexling foer ett behandlingsrum

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9316334A1 *

Also Published As

Publication number Publication date
ATE159093T1 (de) 1997-10-15
FI96239B (fi) 1996-02-15
WO1993016334A1 (fr) 1993-08-19
FI920697A0 (fi) 1992-02-18
ES2107677T3 (es) 1997-12-01
FI96239C (fi) 1996-05-27
DE69314472T2 (de) 1998-02-26
EP0626056B1 (fr) 1997-10-08
AU3454493A (en) 1993-09-03
DE69314472D1 (de) 1997-11-13
GR3025675T3 (en) 1998-03-31
FI920697A (fi) 1993-08-19

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