WO1991001821A1 - Systeme d'aeration - Google Patents

Systeme d'aeration Download PDF

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Publication number
WO1991001821A1
WO1991001821A1 PCT/AU1990/000316 AU9000316W WO9101821A1 WO 1991001821 A1 WO1991001821 A1 WO 1991001821A1 AU 9000316 W AU9000316 W AU 9000316W WO 9101821 A1 WO9101821 A1 WO 9101821A1
Authority
WO
WIPO (PCT)
Prior art keywords
fume cupboard
sash
compartment
air
cupboard according
Prior art date
Application number
PCT/AU1990/000316
Other languages
English (en)
Inventor
Karlheinz Stasch
Original Assignee
Karlheinz Stasch
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 Karlheinz Stasch filed Critical Karlheinz Stasch
Priority to EP90911765A priority Critical patent/EP0494872B1/fr
Priority to DE69032226T priority patent/DE69032226T2/de
Priority to DE4091373A priority patent/DE4091373C2/de
Publication of WO1991001821A1 publication Critical patent/WO1991001821A1/fr

Links

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 ventilation systems including ventilation systems associated with fume cupboards.
  • the invention has been developed primarily for use with a fume cupboard for chemical laboratories and the like, and will be described hereinafter with reference to this application. However, it will be appreciated that the invention is not limited to this particular field of use, and may also be applicable to enclosed spaces receiving conditioned air for maintaining predetermined conditions.
  • a fume cupboard provides a partially enclosed work place for minimising the dispersion of fumes to protect operators, other personnel and the local room air. This is generally achieved by extracting the fumes through associated exhaust ducting. Furthermore, fume cupboards also include selectively movable sashes for providing access to the partially enclosed workplaces.
  • Prior fume cupboards have utilised auxiliary passages to supply a varying external air flow to a main exhaust duct which extends from the fume cupboard.
  • the flow of air in the auxiliary passage dilutes the fumes in the main exhaust duct and has been controlled according to the position of the sash. Opening the sash further restricts the amount of external air entering the exhaust duct thereby increasing the amount of air removed from the fume cupboard.
  • the position of the sash has been indicated by such means as a multi-turn potentiometer mechanically turned by movement of the sash. This and other arrangements do not take into account ambient conditions to which the fume cupboard is subjected. Furthermore, such electro-mechanical systems have proved to be cumbersome and prone to wear.
  • a fume cupboard including: a housing defining both a work compartment and a opening for providing access to said compartment; an exhaust duct extending from said compartment; an extraction fan co-operable with said duct to extract air from said compartment; a movable sash operable for closing predetermined portions of said opening; at least one velocity sensor for providing a signal indicative of the air velocity in said compartment; at least one auxiliary duct communicating with said exhaust duct between said compartment and said extraction fan for providing said exhaust duct with external air; and, at least one damper means responsive to said signal for selectively admitting external air to said exhaust duct to maintain a predetermined air velocity in said compartment.
  • the damper means include two plates respectively rotatably mounted in the exhaust duct between the fume cupboard and the auxiliary passage and in the auxiliary passage.
  • the sash is propelled by drive means to both close predetermined portions of the opening and to substantially close the opening after a predetermined time interval from the last use of the fume cupboard.
  • Figure 1 is a front view of the housing of a fume cupboard according to the invention.
  • Figure 2 is a partially cut-away front view of the exhaust duct extending from the fume cupboard of Figure 1.
  • Figure 3 is a partially cut-away side view of the exhaust duct showing an alternative embodiment of the damper means.
  • a fume cupboard 1 includes a housing 2 which defines both a work compartment 3 and an opening 4 for providing access to the compartment.
  • An exhaust duct 5 extends from compartment 3 and a centrifugal fan 6, driven by an electric motor 7, is co-operable with the exhaust duct for extracting air from the compartment 3 and expelling it through outlet 8.
  • the motor 7 is connected to a constant voltage supply for providing a substantially constant speed of rotation of fan 6.
  • Velocity sensors 9 and 10 are mounted to the housing 2 respectively adjacent the upper and lower edges of opening 4. These sensors supply electrical signals indicative of the sensed air velocity to a control unit 12 via standard electrical cables (not shown) . Velocity sensors such as a model from the AWM series, produced by Honeywell, are suitable for this application, however similar sensors may also be used.
  • the position of the sensor within the compartment is selected according to the flow patterns therein. This position is dependant upon the physical dimensions of the compartment, and for example with large fume cupboards the sensors are respectively centrally located above and below the opening.
  • An auxiliary air duct 14 communicates with the exhaust duct 5 between the compartment 3 and the extraction fan 6 for providing the exhaust duct with external air.
  • the source of external air is distinct both from the laboratory air and that expelled through outlet 8.
  • the damper means includes two plates 15 and 16 respectively rotatably mounted in the exhaust duct 5 between the fume cupboard and the auxiliary passage and in the auxiliary passage.
  • Plates 15 and 16 are respectively driven by electric motors 17 and 18, each motor being selectively actuated by control unit 12 via suitable electrical conductors (not shown). Also, plates 15 and 16 move in an opposite sense to maintain a substantially constant cross-sectional area of ducting to supply air to the extraction fan.
  • the positions of the plates can be continuously displayed by a pair of meters 31 and 32 located on the housing 2 above opening 4.
  • the meters are responsive to signals from the control unit 12, which continuously updates the information displayed.
  • the fume cupboard includes a movable sash 11 operable for closing predetermined portions of the opening 4.
  • the sash preferably includes a sheet of transparent material whereby the contents of the compartment 3 can be perceived when the sash is in the closed position.
  • the velocity sensors 9 and 10 will initially signal a reduction in air velocity.
  • the control unit 12 will respond by actuating motor 18 to rotate plate 16 to restrict the passage of external air through the auxiliary duct 14.
  • motor 17 will rotate plate 15 in an opposite sense for providing less restriction to the air flow in exhaust duct 5 resulting in an increase in volume of air moving through compartment 3.
  • equilibrium will be achieved when the air velocity has reached the predetermined value.
  • the velocity sensors detect any ambient conditions in the air velocity or pressure resultant from changes in these conditions in the surrounding laboratory containing the fume cupboard.
  • the control system accommodates these conditions by actuating an appropriate change in the position of the plates 15 and 16. In the event of such conditions dangerous fumes will continue to be removed through the exhaust system, and prevented from exiting through the sash opening and thus endangering the operators. Any wind gusts incident upon damper plates 15 or 16 from an external source are continuously accommodated by the control system, thereby preventing any fumes from being redirected back into the fume cupboard through the exhaust duct.
  • velocity sensors 9 and 10 will correspondingly signal a failure in the maintenance of the predetermined airflow in compartment 3. A suitable alarm is then actuated for signalling such a fault to an operator.
  • the sash 11 is propelled by a tubular motor 20 such as model 534B produced by Somfy. Following actuation of a manual switch 21 the motor 20, by winching suitable chords 29 and 30, will effect the movement of sash 11.
  • a plurality of such switches can be conveniently located for actuating sash movement, such as a foot operable switch (not shown) being located at the base of the fume cupboard or a knee operable switch (not shown) located at the lower edge of the housing.
  • a remote control switch utilising infra-red radiation is able to actuate sash movement.
  • the motor 20 is able to position the sash 11 in any location between a fully open position (as shown in Figure 1) and a fully closed position.
  • the motor propels the sash either in a continuous motion or in discrete steps.
  • An infra red transmitter 23 and sensor 24 are respectively located on opposing sides of the opening 4 to establish an infra red field across the opening.
  • the output of sensor 24 is linked to control unit 12 via suitable conductors for allowing the detection of an interruption of the field by an operator or the like. In the event of such an interruption, the control unit resets an associated timer. Should the timer be allowed to progress to a predetermined value the control unit actuates motor 20 to effect the closing of sash 11.
  • This feature allows for operator error resulting in the sash being left open, and prevents the unnecessary evacuation of heated or cooled air from the laboratory. Due to the large volume of air which can be removed, this represents the saving of substantial amounts of energy.
  • a single plate 25 is located at the junction of the auxiliary air duct 14 and the exhaust duct 5. This arrangement provides for a similar effect as that shown in Figure 2 while only requiring the use of the single plate 25.
  • the plate is hingedly mounted for rotation between fully restricting air flow from the auxiliary duct to a position where it fully restricts air flow from the fume cupboard into exhaust duct 5.
  • the plate is driven by electric motor 26, which in turn is actuated by the control unit 12.
  • the control unit is able to supply all the information it collects to an external source via a connector 35, and can further respond to instructions received from such a source. This facilitates the central control of a plurality of such fume cupboards for example in a large laboratory. Safety conditions are able to be monitored from a central location for providing suitable warning to all operators.
  • connector 35 is a DIN96. This enables the cupboard to be connected to a microprocessor system, or the like, for allowing a plurality of such cupboards to be centrally connected and controlled.
  • a ventilation system for a room including doors and other openings, where the associated ducting directs the supply of conditioned air to the room.
  • Velocity sensors appropriately positioned are able to supply a signal indicative of the air velocity to a damper system within the ducting for maintaining a substantially constant predetermined air velocity in the room.

Landscapes

  • Ventilation (AREA)
  • Air-Flow Control Members (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Devices For Use In Laboratory Experiments (AREA)

Abstract

Un système d'aération, notamment pour hottes fermées du type utilisé dans des laboratoires ou dans des situations similaires, comprend des capteurs de vitesse qui transmettent des signaux à un système de commande d'un système amortisseur qui règle sélectivement l'apport d'air extérieur à un conduit d'échappement et maintient une vitesse prédéterminée d'air dans la hotte fermée. De préférence, la fenêtre de la hotte fermée comprend des moyens d'actionnement qui permettent de fermer automatiquement la fenêtre pendant des périodes prolongées de non utilisation.
PCT/AU1990/000316 1989-07-31 1990-07-31 Systeme d'aeration WO1991001821A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP90911765A EP0494872B1 (fr) 1989-07-31 1990-07-31 Systeme d'aeration
DE69032226T DE69032226T2 (de) 1989-07-31 1990-07-31 Ein ventilationssystem
DE4091373A DE4091373C2 (de) 1989-07-31 1990-07-31 Ventilations-System

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPJ5501 1989-07-31
AUPJ550089 1989-07-31
AUPJ550189 1989-07-31
AUPJ5500 1989-07-31

Publications (1)

Publication Number Publication Date
WO1991001821A1 true WO1991001821A1 (fr) 1991-02-21

Family

ID=25643722

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1990/000316 WO1991001821A1 (fr) 1989-07-31 1990-07-31 Systeme d'aeration

Country Status (4)

Country Link
EP (1) EP0494872B1 (fr)
AT (1) ATE164787T1 (fr)
DE (3) DE69032226T2 (fr)
WO (1) WO1991001821A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0541863A1 (fr) * 1990-09-28 1993-05-19 Landis & Gyr Powers, Inc. Dispositif de contrôle pour hotte de laboratoire à caractéristiques de sécurité améliorées
WO1993014889A1 (fr) * 1992-01-28 1993-08-05 United Kingdom Atomic Energy Authority Systeme d'extraction d'une hotte d'aspiration
EP0610224A1 (fr) * 1991-08-23 1994-08-17 Phoenix Controls Corporation Commande d'une hotte d'aspiration
GB2279455A (en) * 1992-01-28 1995-01-04 Atomic Energy Authority Uk Fume cupboard extraction system
US5415583A (en) * 1993-12-21 1995-05-16 Brandt, Jr.; Robert O. Fume hood air flow control system
EP0701871A3 (fr) * 1994-08-12 1996-07-31 Eisenmann Corp Construction d'un système d'évacuation du type "botte aspirante".

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10217100B4 (de) * 2002-04-17 2007-07-19 Thermo Electron Led Gmbh Fernbedienbare Sicherheitswerkbank
DE10217903C1 (de) * 2002-04-22 2003-10-02 Kendro Lab Prod Gmbh Sicherheitswerkbank mit vereinfachter Bedienbarkeit
DE10245208B4 (de) * 2002-09-27 2004-08-12 Fazlollah Khadjavi Abluftrüsselsystem
DE20218363U1 (de) * 2002-11-26 2004-01-15 Meltem Wärmerückgewinnung GmbH & Co. KG Luftaustauschsystem für die Entlüftung wenigstens eines Raums eines Gebäudes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB968287A (en) * 1962-01-31 1964-09-02 Nat Res Dev Improvements in or relating to fume cupboards
GB1069868A (en) * 1965-01-14 1967-05-24 Landbouwwerktuigen & Maschf Improvements in and relating to means for withdrawing vapours generated by electric welding
GB2076145A (en) * 1980-03-24 1981-11-25 A C Plastic Ind Enclosures with a Gas Extraction System
US4706553A (en) * 1984-03-05 1987-11-17 Phoenix Controls Corp. Fume hood controller
AU7555187A (en) * 1986-07-11 1988-01-14 Ronald Edmond Lucas Fume cupboard with variable damper
JPH0244137A (ja) * 1988-08-03 1990-02-14 Matsushita Electric Ind Co Ltd 排煙浄化装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4160407A (en) * 1977-11-18 1979-07-10 Bell Telephone Laboratories, Incorporated Ventilating system
GB2097527B (en) * 1981-04-16 1985-10-09 Febopal Ltd Fume cupboards
GB2129928B (en) * 1982-10-16 1986-09-10 Yamato Scient Co Ltd A fume hood
US4741257A (en) * 1985-01-09 1988-05-03 Air Monitor Corporation Fume hood air flow control
CH670207A5 (en) * 1986-01-23 1989-05-31 Karl Babberger Extn. vent with sliding window esp. for laboratory - incorporates throttle valve with position controller for adjustment of draught in relation to opening of window
GB2222705A (en) * 1988-05-19 1990-03-14 Thomas Arthur Wisbey Wheeler Reduced pressure enclosure

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB968287A (en) * 1962-01-31 1964-09-02 Nat Res Dev Improvements in or relating to fume cupboards
GB1069868A (en) * 1965-01-14 1967-05-24 Landbouwwerktuigen & Maschf Improvements in and relating to means for withdrawing vapours generated by electric welding
GB2076145A (en) * 1980-03-24 1981-11-25 A C Plastic Ind Enclosures with a Gas Extraction System
US4706553A (en) * 1984-03-05 1987-11-17 Phoenix Controls Corp. Fume hood controller
US4706553B1 (fr) * 1984-03-05 1991-07-23 Phoenix Controls Corp
AU7555187A (en) * 1986-07-11 1988-01-14 Ronald Edmond Lucas Fume cupboard with variable damper
JPH0244137A (ja) * 1988-08-03 1990-02-14 Matsushita Electric Ind Co Ltd 排煙浄化装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, M-967, page 110, JP,A, 2-44137 (MATSUSHITA ELECTRIC IND CO LTD) 14 February 1990 (14.02.90). *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0541863A1 (fr) * 1990-09-28 1993-05-19 Landis & Gyr Powers, Inc. Dispositif de contrôle pour hotte de laboratoire à caractéristiques de sécurité améliorées
EP0610224A1 (fr) * 1991-08-23 1994-08-17 Phoenix Controls Corporation Commande d'une hotte d'aspiration
EP0610224A4 (fr) * 1991-08-23 1995-02-15 Phoenix Controls Corp Procede et appareil de commande d'une hotte d'aspiration.
WO1993014889A1 (fr) * 1992-01-28 1993-08-05 United Kingdom Atomic Energy Authority Systeme d'extraction d'une hotte d'aspiration
GB2279455A (en) * 1992-01-28 1995-01-04 Atomic Energy Authority Uk Fume cupboard extraction system
US5415583A (en) * 1993-12-21 1995-05-16 Brandt, Jr.; Robert O. Fume hood air flow control system
EP0701871A3 (fr) * 1994-08-12 1996-07-31 Eisenmann Corp Construction d'un système d'évacuation du type "botte aspirante".

Also Published As

Publication number Publication date
ATE164787T1 (de) 1998-04-15
DE69032226D1 (de) 1998-05-14
DE4091373C2 (de) 2000-08-10
EP0494872A4 (en) 1992-12-23
DE4091373T (fr) 1992-12-10
EP0494872A1 (fr) 1992-07-22
EP0494872B1 (fr) 1998-04-08
DE69032226T2 (de) 1999-10-07

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