EP0725687B1 - Enceinte de travail - Google Patents

Enceinte de travail Download PDF

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Publication number
EP0725687B1
EP0725687B1 EP94919040A EP94919040A EP0725687B1 EP 0725687 B1 EP0725687 B1 EP 0725687B1 EP 94919040 A EP94919040 A EP 94919040A EP 94919040 A EP94919040 A EP 94919040A EP 0725687 B1 EP0725687 B1 EP 0725687B1
Authority
EP
European Patent Office
Prior art keywords
cabinet
suction
connection
hood
suction box
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.)
Expired - Lifetime
Application number
EP94919040A
Other languages
German (de)
English (en)
Other versions
EP0725687A1 (fr
Inventor
Claes Henningson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0725687A1 publication Critical patent/EP0725687A1/fr
Application granted granted Critical
Publication of EP0725687B1 publication Critical patent/EP0725687B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
    • B08B15/023—Fume cabinets or cupboards, e.g. for laboratories

Definitions

  • the present invention relates to a cabinet acting as a fume cupboard, alternatively as a work bench.
  • the cabinet comprises a cabinet hood having side walls, a rear wall and a front with an access opening and a slide door, and ventilation means to create subpressure in the cabinet or the work bench.
  • fume cupboards of a conventional type In laboratory interiors, where work with toxic chemicals takes place, there are found as a standard on the one hand fume cupboards of a conventional type, and on the other hand so called work benches.
  • a work bench work is performed with dangerous chemcials, for example substances releasing toxic or corrosive vapours or the like, and the work in fume cupboards is often associated with heating, the ventilation through an underpressure in the cabinet taking place with the creation of an upwardly directed air flow.
  • the ventilation air in principle leaves at the upper part of the cabinet.
  • the equipment is designed in such a manner that the fume cupboards are arranged separate from the work benches which results in extensive space requirements and therefore means that the equipment requires extensive space and, furthermore, the physical separation between fume cupboards and work benches results in impaired installation flexibility.
  • a work cabinet acting as a fume cupboard and/or as a work bench comprising a cabinet hood having side walls, a rear wall and a front having an access opening and a slide door.
  • the cabinet further contains a work bench having a perforated element and a suction tray and a ventilation duct for connection to a suction fan.
  • the cabinet according to said US patent contains a damper or fin which can be manually adjusted to form an upper fume collection chamber or can be moved to another position whereby the interior of the hood communicates with the ventilation duct.
  • the hood has no direct communication with the surroundings in either position of the damper or fin.
  • the present invention has for its main purpose to provide a modified work cabinet which can be alternatively used as a fume cupboard or as a work bench, this being possible by a simple adjustment procedure within the frame work of the same construction.
  • Another purpose of the invention is to provide a work cabinet which results in improved flexibility in connection with ventilation dynamics and enables a generally improved ventilation.
  • Yet another object of the invention is to provide a work cabinet which, in spite of its simple construction, functions well, as a fume cupboard as well as a work bench without setting aside the-safety for the laboratory operator.
  • the work cabinet acting as a fume cupboard and, alternatively, as a work bench.
  • the work cabinet according to the invention comprises a cabinet hood having associated side walls, a double rear wall, a front having an access opening and a slide door, and a work bench having a perforated work surface and a ventilation duct for connection to a suction fan or other means capable of generating subpressure in the cabinet.
  • the cabinet further comprises a suction box being in connection with the ventilation duct and at the lower part thereof being connectable with the interior of the cabinet hood, and ducts 29,31 which connect the area above the perforated work surface or the suction tray 21 to the suction box 33, and an adjustment damper 41 which is adjustable between a first position (L 1 ) that essentially blocks the connection between the suction box 33 and the interior of the cabinet hood 3, and a second position (L 2 ), said suction box 33 occupying depthwise only part of the upper end of the cabinet which is otherwise open.
  • the cabinet according to the invention is characterized in that the cabinet, with the adjustment damper 41 in said second position, essentially blocks the connection between the interior of the cabinet hood 3 and the surroundings, the cabinet mainly operating as a fume cupboard, and that the cabinet is open at the top except for the space occupied by the suction box (33).
  • said ducts are arranged adjacent to the rear wall of the cabinet and, optionally, also in association with the side walls of the cabinet. It is particularly preferred that at least a first duct is arranged adjacent to the rear wall and that at the lower end thereof it is connected to the suction tray for downward suction through the perforated work surface
  • At least a second duct is arranged adjacent to each of the side walls and adjacent to the rear wall on each side of said first duct. These second ducts open at the lower end thereof into the area above the perforated work surface for suction backwardly across said perforature.
  • said first duct which is connected to the suction tray is flanked by said second ducts opening into the area above the perforated work surface, said ducts thus being arranged adjacent to the rear wall 25.
  • said suction box is provided with a downwardly oriented wall thus separating at its upper end the suction box area from the other part of the cabinet.
  • the damper is preferably pivotably arranged at the lower edge of the downwardly oriented wall.
  • the connection between the suction box and the interior of the cabinet contains a restriction element or grid, whereby the flow resistance through said connection can be controlled.
  • a drive motor particularly an electric one, by means of which the damper can be moved between the two positions for changing the cabinet to a fume cupboard or to a work bench.
  • the slide door may be connected to a counter weight, for example via cords running over pulleys, whereby its displacement upwardly is facilitated by balancing the weight of the slide door.
  • a lamp mounting is suitably placed on the front of the cabinet above the working position.
  • the cabinet according to the present invention is at its upper part provided with a suction box extending essentially across the full width of the cabinet and suitably being positioned adjacent to the rear wall of the cabinet.
  • the adjustable damper means that the ventilation characteristics of the cabinet can be changed between on the one hand the use of the cabinet as a fume cupboard and on the other hand for use as a work bench. In between intermediate positions can be used as desired dependent on the type of work performed in the cabinet.
  • the cabinet according to the invention either operates as a fume cupboard or as a work bench.
  • the work cabinet shown in the drawings and generally designated 1 comprises, in a conventional manner, a cabinet hood 3 provided with side walls 4 and a rear wall 25.
  • the front of the cabinet is provided with an access opening 7 with an associated slide door 9 which, by means of a handle 11, can be moved upwardly or downwardly to a suitable access opening, the position shown in Fig. 2.
  • the cabinet is provided with a counter weight 17 which, via cords 13, is connected to the upper part of the slide door 9.
  • cords 13 travel over pulleys 15 arranged at the upper part of the cabinet.
  • the slide door 9 moves in a space inside the front of the cabinet defined by a downwardly directed wall section 18 at the upper end of the cabinet.
  • the cabinet 1 rests on four legs 5 for providing suitable working level.
  • the cabinet can, of course, be anchored directly against the wall in a laboratory space without the use of legs.
  • a work surface or work bench 19 is arranged which is provided with a perforated sheet 23 having openings 24 and a suction tray 21 arranged under the perforated sheet. Furthermore, there is arranged on one side of the cabinet in a conventional manner a discharge funnel 20 and discharge means 22 for water, gas etc.
  • suction box 33 In association with the rear wall 25, which is double so as to create a space 27 for the counter weight 17, two side ducts 29 and one central duct 31 are arranged. In association with the upper part of the rear wall 25 a suction box 33 is arranged which is provided with a front wall 35, and via a perforated grid 37 the suction box 33 is in communication with the interior of the cabinet. Furthermore, suction box 33 is provided with a ventilation duct 39 for connection to a suction fan not shown for providing subpressure in the cabinet and thereby the desired ventilation.
  • the central duct 31 opens at its upper end into the suction box 33, whereas at its lower end it is in connection with the suction tray 21 for a purpose to be described below.
  • the flanking side ducts 29 are also at their upper ends in connection with the suction box 33 but open at their lower ends in the area above the perforature 23, also here for a purpose to be described below.
  • a manually or motor-operated adjustment damper 41 is provided which can be pivoted between the extreme positions indicated L 1 and L 2 in Fig. 2.
  • This adjustment damper 41 can be controlled manually or via an electric motor 43 diagrammatically shown in Fig. 1.
  • the motor 43 is operated from the control panel 40 by means of control means 45 and 47, actuating control member 47 bringing damper 41 to position L 1 , whereas actuating control member 45 bringing damper 41 to position L 2 .
  • cabinet 1 shall be used for working with substances which require heating where poisonous vapours are generated.
  • the cabinet in this case shall function as a fume cupboard.
  • damper 41 By means of pressing knob 45 damper 41 is moved to the position shown by L 2 in Fig. 2 by means of the driving motor 43. This will cause essential blockage of the direct connection between the interior of the cabinet and the surrounding via the otherwise open upper end. With damper 41 in this position there is thus established connection between the suction box 33 and the interior of the cabinet via the perforated grid 37, and ventilation is maintained in the cabinet by an upwardly directed air flow as in a normally operating fume cupboard. In a closed condition about 50% of the ventilation air leaves by a passage through the perforated grid, whereas the reminder passes via ducts 29 over the perforated work surface 23 and a minor part also through the central duct 31 through the perforature 23.
  • the damper 41 When work of work bench nature shall be carried out, which normally takes place without heating of the chemicals involved, the damper 41 is adjusted to the position shown by L 1 in Fig. 2 by pressing knob 47.
  • the cabinet according to the invention operates as a work bench in that the connection between the interior of the cabinet and the surrounding via the partially open upper part of the cabinet results in downwardly directed ventilation in the cabinet, where the major part of the air passes down through perforations 23 and up through the cental duct 31, whereas a minor part, for example about 30%, of the ventilation air passes out through side ducts 29, the remaining about 10% passing out through suction tray 33 by leakage around damper 41.
  • the materials are conventional and the cabinet frame work can be made for example using a particle board and a white laminate, whereas the slide door can be made of a safety laminate glass and the work bench made with a perforated work surface of acid-proof stainless steel.
  • the work surface may, of course, also be made from any resistant polymer, such as polypropylene, or from enamel or ceramic or an epoxi material.
  • the instrument panel 40 placed at one side of the cabinet results in ease of survey and simple operation, and installation connections involved can take place both from floor or from roof or both.

Landscapes

  • Ventilation (AREA)
  • Glass Compositions (AREA)
  • Forging (AREA)
  • Tumbler Switches (AREA)
  • Combinations Of Kitchen Furniture (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Pens And Brushes (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Cookers (AREA)
  • Saccharide Compounds (AREA)

Claims (10)

  1. Enceinte servant de sorbonne et, également, en tant que plan de travail, comprenant une hotte d'enceinte (3) à laquelle sont associées des parois latérales (4), une paroi arrière (25), un devant comportant une ouverture d'accès (7) et une porte coulissante (9), et un plan de travail (19) présentant une surface de travail perforée (23) et un plateau d'aspiration (21), ainsi qu'une conduite de ventilation (39) destinée à être reliée à un ventilateur d'aspiration, une boíte d'aspiration (33) disposée dans la partie supérieure de la hotte d'enceinte (3), ladite boíte étant reliée à la conduite de ventilation (39) et pouvant être reliée à la partie inférieure de celle-ci avec l'intérieur de la hotte d'enceinte, comprenant en outre des conduites (29, 31) qui relient la zone au-dessus de la surface de travail perforée ou le plateau d'aspiration (21) à la boíte d'aspiration (33), et un registre de réglage (41) qui est réglable entre une première position (L1) qui bloque pratiquement la liaison entre la boíte d'aspiration (33) et l'intérieur de la hotte d'enceinte (3), et une seconde position (L2), ladite boíte d'aspiration (33) occupant en profondeur uniquement une partie de l'extrémité supérieure de l'enceinte qui est par ailleurs ouverte, caractérisée en ce que l'enceinte, le registre de réglage (41) étant dans la seconde position, bloque pratiquement la liaison entre l'intérieur de la hotte d'enceinte (3) et l'environnement, l'enceinte servant principalement de sorbonne, et en ce que l'enceinte est ouverte à la partie supérieure à l'exception de l'espace occupé par la boíte d'aspiration (33).
  2. Enceinte selon la revendication 1, caractérisée en ce que lesdites conduites (29, 31) sont disposées à proximité de la paroi arrière (25) de l'enceinte (1) et, en option, également en association avec les parois latérales (4) de l'enceinte (1).
  3. Enceinte selon la revendication 2, caractérisée en ce qu'au moins une première conduite (31) est disposée à proximité de la paroi arrière (25) et est reliée, au niveau de l'extrémité inférieure de celle-ci, à un plateau d'aspiration (21) destiné à une évacuation vers le bas au travers de la surface de travail perforée.
  4. Enceinte selon la revendication 3, caractérisée par au moins une seconde conduite (29) disposée à proximité de chacune des parois latérales (4) et à proximité de la paroi arrière (25) sur chaque côté de ladite première conduite (31), lesdites autres conduites (29) s'ouvrant au niveau de l'extrémité inférieure de celles-ci dans la zone au-dessus de la surface de travail perforée (23) en vue d'une aspiration vers l'arrière au-dessus de celle-ci.
  5. Enceinte selon la revendication 4, caractérisée en ce que ladite première conduite (31) est flanquée desdites autres conduites (29).
  6. Enceinte selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit registre de réglage (41) est disposé avec possibilité de pivotement au niveau du bord inférieur de la paroi s'étendant vers le bas (35) appartenant à la boíte d'aspiration (33).
  7. Enceinte selon l'une quelconque des revendications précédentes, caractérisée en ce que la liaison entre la boíte d'aspiration (33) et l'intérieur de l'enceinte (1) contient un élément de restriction ou grille (37), grâce auquel la résistance à l'écoulement au travers de ladite liaison peut être commandée.
  8. Enceinte selon la revendication 6 ou 7, caractérisée par un moteur d'entraínement (43), au moyen duquel le registre peut être déplacé entre les deux positions (L1, L2).
  9. Enceinte selon l'une quelconque des revendications précédentes, caractérisée en ce que ladite porte coulissante (9) est reliée à un contrepoids (17) afin de faciliter son déplacement vers le haut.
  10. Enceinte selon l'une quelconque des revendications précédentes, caractérisée par une monture de lampe (12) positionnée sur l'avant de l'enceinte (1) au-dessus de la position de travail.
EP94919040A 1993-09-10 1994-09-07 Enceinte de travail Expired - Lifetime EP0725687B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9302943 1993-09-10
SE9302943A SE501870C2 (sv) 1993-09-10 1993-09-10 Arbetsskåp fungerande som dragskåp eller dragbänk
PCT/SE1994/000832 WO1995007154A1 (fr) 1993-09-10 1994-09-07 Enceinte de travail

Publications (2)

Publication Number Publication Date
EP0725687A1 EP0725687A1 (fr) 1996-08-14
EP0725687B1 true EP0725687B1 (fr) 1999-04-14

Family

ID=20391051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94919040A Expired - Lifetime EP0725687B1 (fr) 1993-09-10 1994-09-07 Enceinte de travail

Country Status (8)

Country Link
EP (1) EP0725687B1 (fr)
AT (1) ATE178815T1 (fr)
DE (1) DE69417911D1 (fr)
DK (1) DK0725687T3 (fr)
FI (1) FI105458B (fr)
NO (1) NO301154B1 (fr)
SE (1) SE501870C2 (fr)
WO (1) WO1995007154A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108237132A (zh) * 2017-11-07 2018-07-03 苏州市凯利勋实验室设备有限公司 一种用于通风柜的自动补风装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110773540A (zh) * 2019-12-06 2020-02-11 青岛中科汉维实验室装备科技有限公司 一种可以四面开门的通风罩

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1934808A (en) * 1930-11-22 1933-11-14 John M Liptay Single draft fume hood
US4098174A (en) * 1976-04-08 1978-07-04 Landy Jerome J Total exhaust laminar flow biological fume hood safety cabinet and method
GB2088043B (en) * 1980-11-22 1984-01-11 Isc Chemicals Ltd Fume extraction apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108237132A (zh) * 2017-11-07 2018-07-03 苏州市凯利勋实验室设备有限公司 一种用于通风柜的自动补风装置

Also Published As

Publication number Publication date
ATE178815T1 (de) 1999-04-15
DE69417911D1 (de) 1999-05-20
EP0725687A1 (fr) 1996-08-14
FI961092A0 (fi) 1996-03-08
NO960983D0 (no) 1996-03-08
NO960983L (no) 1996-05-08
NO301154B1 (no) 1997-09-22
WO1995007154A1 (fr) 1995-03-16
SE9302943L (sv) 1995-03-11
SE9302943D0 (sv) 1993-09-10
FI105458B (fi) 2000-08-31
FI961092A (fi) 1996-05-06
SE501870C2 (sv) 1995-06-12
DK0725687T3 (da) 1999-10-25

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