EP3919195B1 - Sorbonne et procédé de commande d'une telle sorbonne - Google Patents

Sorbonne et procédé de commande d'une telle sorbonne Download PDF

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Publication number
EP3919195B1
EP3919195B1 EP20177959.2A EP20177959A EP3919195B1 EP 3919195 B1 EP3919195 B1 EP 3919195B1 EP 20177959 A EP20177959 A EP 20177959A EP 3919195 B1 EP3919195 B1 EP 3919195B1
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EP
European Patent Office
Prior art keywords
fume cupboard
electrical power
control unit
fume
cupboard
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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.)
Active
Application number
EP20177959.2A
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German (de)
English (en)
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EP3919195C0 (fr
EP3919195A1 (fr
Inventor
Johan Jönsson
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.)
Innoguard Utvecklingsgrupp AB
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Innoguard Utvecklingsgrupp AB
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Application filed by Innoguard Utvecklingsgrupp AB filed Critical Innoguard Utvecklingsgrupp AB
Priority to EP20177959.2A priority Critical patent/EP3919195B1/fr
Publication of EP3919195A1 publication Critical patent/EP3919195A1/fr
Application granted granted Critical
Publication of EP3919195C0 publication Critical patent/EP3919195C0/fr
Publication of EP3919195B1 publication Critical patent/EP3919195B1/fr
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    • 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 method for controlling a fume cupboard and such fume cupboard.
  • a fume cupboard is a ventilated enclosure where harmful materials can be handled safely.
  • the fume cupboard captures contaminants and prevents them from escaping into an environment around the fume cupboard by using an exhaust blower to draw air and contaminants in and around the hood's work area away from the operator so that inhalation of and contact with the contaminants are minimized.
  • Access to the interior of the hood is through an opening which can be closed with a sash which typically slides up and down to vary the opening into the hood.
  • a process for deactivating a fume cupboard comprises an open front section which is closable by means of a front sash, a work chamber enclosed by side sections, a bottom section, a back side section, and a top section provided with an exhaust opening.
  • the fume cupboard further comprises an electrical power measuring unit configured to measure electrical power consumption of the fume cupboard.
  • the electrical power measuring unit is configured to measure the electrical power consumption of one or more electrical power outlets of the fume cupboard. It is advantageous to measure power consumption of electrical power outlets in order to determine if work is being performed in the fume cupboard.
  • the predetermined threshold condition is zero power consumption. This indicates that no electrical equipment is connected to the power outlet(s) of the fume cupboard, and is thus an indication that no work is being performed in the fume cupboard.
  • the process further comprises measuring a volatile organic compound (VOC) content in the air flow through the exhaust opening by means of a volatile organic compound (VOC) sensor. If the measured volatile organic compound (VOC) content is not equal to zero, the deactivation process is interrupted. If the volatile organic compound (VOC) content is not equal to zero, it means that a process is going on in the fume cupboard, and the fume cupboard should thus not be deactivated.
  • VOC volatile organic compound
  • the process further comprises measuring an air temperature of the air flow through the exhaust opening by means of a temperature sensor. If the temperature value is not equal to a supply air temperature, the deactivation process is interrupted. If the temperature differs from a supply air temperature, it means that a process is going on in the fume cupboard, and the fume cupboard should thus not be deactivated.
  • the process further comprises detecting presence in a gap between the front sash and the bottom section by means of a first presence detection means. If presence is detected, the deactivation process is interrupted. If presence is detected, it means that someone is working in the fume cupboard, and the fume cupboard should thus not be deactivated.
  • the process further comprises detecting presence in the room where said fume cupboard is located by means of a second presence detection means. If presence is detected, the deactivation process is interrupted. If presence is detected in the room of the fume cupboard, it means that someone may intend to perform work in the fume cupboard, and the fume cupboard should thus not be deactivated.
  • the process further comprises blocking the front sash in the closed position. This is advantageous in that the fume cupboard must be unblocked before any work may start therein.
  • a fume cupboard comprising an open front section which is closable by means of a front sash, and a work chamber enclosed by side sections, a bottom section, a back side section, and a top section.
  • the top section is provided with an exhaust opening.
  • the fume cupboard further comprises an electrical power measuring unit configured to measure electrical power consumption of the fume cupboard; and a control unit operatively connected to the electrical power measuring unit for receiving an input signal indicative of the electrical power consumption.
  • the control unit is configured to deactivate the fume cupboard into an inactive state when the electrical power measuring unit measures the electrical power consumption to fulfill a predetermined threshold condition.
  • the inactive state of the fume cupboard comprises: the front sash is configured to be closed and blocked; the electrical power supply for electrical power outlets in the fume cupboard is configured to be turned off; and an air flow through the fume cupboard is configured to be controlled to a minimum flow.
  • This fume cupboard is advantageous in that the air flow through the fume cupboard is lowered, which results in lowered environmental impact, and reduced costs for a property owner due to reduced heating/cooling/treating of supply air.
  • the actions of the inactive state of the fume cupboard are advantageous in that they prevent work from being performed in the fume cupboard, or save energy.
  • the minimum flow is approximately 0.1-20 l/s, preferably 5-15 l/s, more preferred 8-12 l/s, and most preferred 10 l/s. This advantageous in that it is a large reduction compared to the air flow through an active fume cupboard.
  • control unit is configured to be in operative connection with an air flow regulation unit configured to adjust the air flow through the fume cupboard. It is advantageous to operatively connect an air flow regulation unit with the control unit, in that the air flow through the fume cupboard may be precisely controlled.
  • the fume cupboard further comprises a volatile organic compound (VOC) sensor in operative communication with the control unit and configured to measure a volatile organic compound (VOC) content in the exhaust air.
  • VOC volatile organic compound
  • the volatile organic compound (VOC) content in the exhaust air is a favourable variable to measure in order to be able to determine when the fume cupboard is to be put in an inactive state.
  • the fume cupboard further comprises a first presence detector in operative communication with the control unit and configured to detect presence in a gap between the front sash and the bottom section.
  • the presence detector is favourable in order to be able to determine if a person is performing work in the fume cupboard.
  • the fume cupboard further comprises a second presence detector in operative communication with the control unit and configured to detect presence in a room in which the fume cupboard is located.
  • the presence detector is favourable in order to be able to determine if a person is present in the room, which means that work may be intended to be performed in the fume cupboard.
  • the fume cupboard further comprises a temperature sensor in operative communication with the control unit and configured to measure a temperature of the exhaust air.
  • the temperature of the exhaust air is a favourable variable to measure in order to be able to determine when the fume cupboard is to be put in an inactive state.
  • This application relates to a fume cupboard, and how the fume cupboard can be automatically deactivated in a safe manner.
  • fume cupboards are usually used for possibly hazardous work, comprising fumes, vapors, steams, odours, sprays, splashes, etc.
  • the air flow through a fume cupboard is approximately 200 l/s in an active work state. Since there currently is no good way of determining whether work is being performed in a fume cupboard, a consequence is that most fume cupboards are drawing out 200 liters of treated (dehumidified, heated, cooled etc.) air every second.
  • a fume cupboard which is configured to determine if work is being performed within the fume cupboard, and if no work is being performed, the fume cupboard is configured to enter a passive or inactive state where the ventilation is lowered to a minimum, e.g. to an air flow of approximately 10 l/s.
  • the inventor of the present invention has after insightful reasoning and inventive thinking designed a fume cupboard that is configured to determine when no work is going on inside the fume cupboard, and which is then configured to enter a passive/inactive state.
  • the fume cupboard is further configured to re-enter the active state as soon as work is being initiated inside the fume cupboard.
  • the fume cupboard comprises a control unit which is configured to initiate a deactivation process as soon as a first condition is fulfilled. This condition is that there is an electrical power consumption of the fume cupboard is below a predetermined threshold value. This fume cupboard and a method of controlling the fume cupboard will be more thoroughly described below.
  • Figs 1 and 3 disclose a fume cupboard 10 which basically is a cabinet having a work chamber 13 enclosed by a housing with a front section 15 which is openable for letting air flow from the outside of the fume cupboard 10 into and through the work chamber 13.
  • the front section 15 is openable by means of a front sash 17 which is configured to be movable between a raised and a lowered position. When the front sash is in the raised position an opening is formed between the front sash 17 and the bottom section 18.
  • the front sash 17 is configured to be operable both manually and automatically by means of a motor (not shown) controlled by a control unit 40.
  • the front sash 17 further comprises a lock or blocking device (not shown) configured to be operated by the control unit 40.
  • the blocking device is e.g. an electromagnetic lock configured to act upon suspension shafts of the front sash 17.
  • the housing comprises a closed back side 14, closed side sections 16, a closed bottom section 18 and a top section 20 provided with an exhaust opening 22.
  • an external exhaust fan or similar device (not shown) is arranged to provide the air flow through the fume cupboard 10.
  • a motorized damper unit 30 in operative connection with the control unit 40 of the fume cupboard 10 is arranged in a duct 23 connected to the exhaust opening 22 of the fume cupboard 10.
  • the damper unit 30 may be any kind of suitable damper unit, e.g. a throttle damper, iris damper, or any other kind of suitable damper.
  • the damper unit 30 comprises position detectors providing a feedback signal indicative of the position of the damper 30.
  • Fig. 1 the fume cupboard 10 in use, i.e. in the active state, is disclosed. This means that activity is going on/work is being performed inside the fume cupboard 10. All work in the fume cupboards 10 require some kind of electrical equipment 12 to be connected to an electrical power outlet 46 of the fume cupboard 10 and consuming electrical power. In Fig. 1 this is represented by a sample container 28 arranged on a heater 12, which in turn is arranged on a work chamber floor plate 24. The heating plate 12 is used to heat up the sample container 28 and any samples or objects located therein. The heater 12 is connected to the electrical power outlet 46. Further, the fume cupboard 10 is provided with other electrically powered units, such as lamps 27, electrical motors for the front sash 17, and for adjustment of working height.
  • other electrically powered units such as lamps 27, electrical motors for the front sash 17, and for adjustment of working height.
  • the control unit 40 of the fume cupboard 10 is provided in a control device 42, as shown in Fig. 2 .
  • the control unit 40 is operatively connected to an electrical power measuring unit 44.
  • the electrical power measuring unit 44 is arranged to measure the electrical power supplied to the fume cupboard 10 at regular time intervals.
  • the electrical power measuring unit may in some embodiments be exchanged for an electrical current measuring unit.
  • the electrical power feeds e.g. the lamps 27 or other lighting in the hood 10, the heating device 12, and/or any other equipment that may be used in the fume cupboard 10, such as automatic stirrers etc.
  • the electrical power measuring unit 44 When no electrical equipment is connected to the electrical power outlet(s) 46 and being active, the electrical power measuring unit 44 is configured to provide a signal corresponding to a zero supply level to the control unit 40. As soon as any electrical equipment is switched on, the electrical power measuring unit 44 is configured to provide an electrical power supply signal corresponding to the present electrical power supply level to the control unit 40.
  • the fume cupboard 10 is provided with at least one temperature sensor 47, arranged in the upper portion of the work chamber 13, preferably in the vicinity of the exhaust opening 22.
  • the fume cupboard 10 is also provided with a volatile organic compound (VOC) sensor 48, arranged in the exhaust opening 22, configured to detect any volatile organic compounds present in the exhaust air.
  • VOC volatile organic compound
  • the front sash 17 is provided with a first presence detector 50, which preferably is an active presence detector.
  • the active presence detector 50 is arranged as an IR curtain extending along the length of the front sash 17.
  • the active presence detector 50 IR curtain is directed downwards, towards the bottom section 18 of the fume cupboard 10. It is configured to detect if any part of a person, e.g. a hand, is present in the opening formed between the front sash 17 and the bottom section 18.
  • the front sash 17 is also provided with a second presence detector 49, which preferably is a passive presence detector, e.g. a passive IR detector.
  • the passive presence detector 49 is configured to detected if a person is present in front of the fume cupboard 10.
  • the range of the passive presence detector 49 is approximately 1-3 meters, preferably 2 meters, from the front section 15 of the fume cupboard 10.
  • Presence in relation to the fume cupboard 10 may also be detected indirectly by means of sensors detecting operator performed movement of the front sash 17, utilization of the electrical power outlets etc.
  • the fume cupboard 10 is configured to enter an inactive state when no work is being performed in the work chamber 13.
  • the control unit 40 is configured to perform a deactivation process 100, comprising monitoring the activities taking place in and around the fume cupboard 10. This process 100 is shown in the flowchart of Fig. 4 . If the deactivation process 100 indicates that no work is being performed in the fume cupboard 10, the control unit 40 is configured to follow a lock-down process 200, shown in the flowchart in Fig. 5 .
  • the control unit 40 is configured to monitor the following variables in order to determine if certain conditions are fulfilled.
  • the variables are monitored continuously and not in any certain order. Different variables may be monitored at different time intervals, but all variables are monitored regularly and not in dependence of each other.
  • the conditions need not be fulfilled in any certain order, but when all conditions are fulfilled, the lock-down process 200 is configured to be initiated.
  • the control unit 40 is configured to initiate the lock-down process 200 in order for the fume cupboard 10 to enter the inactive state.
  • Fig. 3 shows the fume cupboard 10 in the inactive state.
  • the first step of the lock-down process 200 is that the control unit 40 controls 201 the motor coupled to the front sash 17 such that the sash 17 enters a lowered position. In the lowered position, a few centimeters gap is left between the work chamber floor plate 24 and the front sash 17. This is due to safety regulation stating that a certain air flow through the fume cupboard 10 must be maintained at all times. The gap is however small enough such that no person can reach into and perform any work within the fume cupboard 10.
  • the control unit 40 is configured to block 202 the front sash 17.
  • the front sash 17 may thus not easily be opened by a user.
  • the front sash 17 is unblocked only if a user maneuvers a control panel provided on the fume cupboard 10.
  • control unit 40 is configured to switch off 203 the electrical power to the electrical power outlet(s) 46 of the fume cupboard 10 such that no electrical equipment 12 can be active inside the fume cupboard 10.
  • the electrical power may also be switched off for the lamp 27 or other lighting present in the cupboard 10.
  • the control unit 40, the sensors and detectors, the damper unit 30 etc. are however still provided with electrical power.
  • the air flow through the fume cupboard 10 is controlled 204 to a lower flow rate, as shown in Fig. 3 .
  • the air flow is controlled by means of the motorized damper unit 30 in operative connection with the control unit 40.
  • the flow rate of the inactive state is approximately 0.1-20 l/s, preferably 5-15 l/s, more preferred 8-12 l/s, and most preferred 10 l/s.
  • control unit 40 is configured to return the fume cupboard 10 into the active state again.
  • the control unit 40 is configured to show a message on a display (not shown) arranged on the front of the fume cupboard 10.
  • the displayed message comprises information regarding the fume cupboard 10 being in an inactive state, and possibly also a question if the fume cupboard should enter the active state.
  • the display may be any kind of suitable display.
  • the display is a touch-screen which the person may press on in order to re-enter the fume cupboard 10 into the active state.
  • the active presence detector 50 registers presence in the gap below the front sash 17 when the fume cupboard 10 is deactivated, it transmits a signal to the control unit 40 which in turn is configured to re-activate the fume cupboard 10. The same happens if a person grabs the front sash 17 and tries to open it.
  • the fume cupboard 10 enters the active state immediately, without any further interaction with the person. However, if presence is only detected in the room, it is not as likely that it is a person intending to perform work in the fume cupboard 10, as a person may have many other reasons for entering the room where the fume cupboard 10 is located. It is thus beneficial that the fume cupboard 10 is not configured to automatically re-enter the active state solely based on detected presence in the room. This saves heating/cooling/treating of air, and thus costs and the environment.

Landscapes

  • Ventilation (AREA)
  • Air Conditioning Control Device (AREA)

Claims (15)

  1. Procédé (100) permettant de désactiver une sorbonne (10) comprenant une section avant ouverte (15) qui peut se fermer au moyen d'un volet frontal (17), une chambre de travail (13) enfermée par des sections latérales (16), une section inférieure (18), une section côté arrière (14), et une section supérieure (20) pourvue d'une ouverture d'évacuation (22), la sorbonne (10) comprenant en outre une unité de mesure d'alimentation électrique (44) configurée pour mesurer la consommation d'alimentation électrique de la sorbonne (10) ; le procédé comprenant les étapes consistant à :
    - déterminer (102), au moyen de l'unité de mesure d'alimentation électrique (44), si une consommation d'alimentation électrique de la sorbonne (10) remplit une condition seuil prédéterminée ; dans l'affirmative :
    - la fermeture (201) du volet frontal (17) de la sorbonne (10),
    - la commutation (203) d'une alimentation électrique pour la sorbonne (10) sur arrêt ; et
    - la commande (204) d'un débit d'air à travers la sorbonne (10) sur un débit minimal.
  2. Procédé selon la revendication 1, dans lequel l'unité de mesure d'alimentation électrique (44) est configurée pour mesurer la consommation d'alimentation électrique d'une ou plusieurs prises d'alimentation électrique (46) de la sorbonne (10).
  3. Procédé selon la revendication 2, dans lequel la condition seuil prédéterminée est une consommation d'alimentation nulle.
  4. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre la mesure d'une teneur en composés organiques volatils (COV) dans le débit d'air à travers l'ouverture d'évacuation (22) au moyen d'un capteur à composés organiques volatils (COV) (48), et si la teneur en composés organiques volatils (COV) n'est pas égale à zéro, l'interruption du procédé de désactivation (100).
  5. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre la mesure d'une température d'air du débit d'air à travers l'ouverture d'évacuation (22) au moyen d'un capteur de température (47), et si la valeur de température n'est pas égale à une température d'air d'alimentation, l'interruption du procédé de désactivation (100).
  6. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre une détection de présence dans un espace entre le volet frontal (17) et la section inférieure (18) au moyen d'un premier moyen de détection de présence (50), et si une présence est détectée, l'interruption du procédé de désactivation (100).
  7. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre une détection de présence dans la pièce où ladite sorbonne (10) est localisée au moyen d'un second moyen de détection de présence (49), et si une présence est détectée, l'interruption du procédé de désactivation (100).
  8. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre un blocage du volet frontal (17) dans la position fermée.
  9. Sorbonne (10) comprenant une section avant ouverte (15) qui peut se fermer au moyen d'un volet frontal (17), et une chambre de travail (13) enfermée par des sections latérales (16), une section inférieure (18), une section côté arrière (14) et une section supérieure (20), la section supérieure (20) étant pourvue d'une ouverture d'évacuation (22), la sorbonne (10) comprenant en outre
    une unité de mesure d'alimentation électrique (44) configurée pour mesurer la consommation d'alimentation électrique de la sorbonne (10) ;
    une unité de commande (40) connectée de façon opérationnelle à l'unité de mesure d'alimentation électrique (44) destinée à recevoir un signal d'entrée indiquant la consommation d'alimentation électrique ;
    dans laquelle l'unité de commande (40) est configurée pour désactiver la sorbonne (10) dans un état inactif lorsque l'unité de mesure d'alimentation électrique (44) mesure que la consommation d'alimentation électrique remplit une condition seuil prédéterminée, et
    dans laquelle l'état inactif comprend : le volet frontal (17) est configuré pour être fermé et bloqué, l'alimentation électrique pour les prises d'alimentation électrique (46) dans la sorbonne (10) est configurée pour être mise à l'arrêt, et un débit d'air à travers la sorbonne (10) est configuré pour être commandé à un débit minimal.
  10. Sorbonne (10) selon la revendication 9, dans laquelle le débit minimal est d'approximativement 0,1 à 20 l/s, de préférence 5 à 15 l/s, plus préférablement 8 à 12 l/s, et le plus préférablement 10 Ils.
  11. Sorbonne (10) selon l'une quelconque des revendications 9 à 10, dans laquelle l'unité de commande (40) est configurée pour être en connexion opérationnelle avec une unité de régulation de débit d'air (30) configurée pour ajuster le débit d'air à travers la sorbonne (10).
  12. Sorbonne (10) selon l'une quelconque des revendications 9 à 11, comprenant en outre un capteur à composés organiques volatils (COV) (48) en communication opérationnelle avec l'unité de commande (40) et configuré pour mesurer une teneur en composés organiques volatils (COV) dans l'air d'évacuation.
  13. Sorbonne (10) selon l'une quelconque des revendications 9 à 12, comprenant en outre un premier détecteur de présence (50) en communication opérationnelle avec l'unité de commande (40) et configuré pour détecter une présence dans un espace entre le volet frontal (17) et la section inférieure (18).
  14. Sorbonne (10) selon l'une quelconque des revendications 9 à 13, comprenant en outre un second détecteur de présence (49) en communication opérationnelle avec l'unité de commande (40) et configuré pour détecter une présence dans une pièce dans laquelle la sorbonne (10) est localisée.
  15. Sorbonne (10) selon l'une quelconque des revendications 9 à 14, comprenant en outre un capteur de température (47) en communication opérationnelle avec l'unité de commande (40) et configuré pour mesurer une température de l'air d'évacuation.
EP20177959.2A 2020-06-03 2020-06-03 Sorbonne et procédé de commande d'une telle sorbonne Active EP3919195B1 (fr)

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EP20177959.2A EP3919195B1 (fr) 2020-06-03 2020-06-03 Sorbonne et procédé de commande d'une telle sorbonne

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EP3919195B1 true EP3919195B1 (fr) 2023-08-09

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US20220380968A1 (en) * 2021-05-26 2022-12-01 Ozhan Akcakaya Air-flow storage case

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5240455A (en) * 1991-08-23 1993-08-31 Phoenix Controls Corporation Method and apparatus for controlling a fume hood
WO1995013146A1 (fr) * 1993-11-09 1995-05-18 Stasch Karl Heinz Systeme de ventilation informatise
DE10217903C1 (de) * 2002-04-22 2003-10-02 Kendro Lab Prod Gmbh Sicherheitswerkbank mit vereinfachter Bedienbarkeit
US20060079164A1 (en) * 2004-09-30 2006-04-13 Decastro Eugene A Automatic sash safety mechanism
DE102012018474B4 (de) * 2012-09-19 2022-06-30 Berner International Gmbh Sicherheitswerkbank mit einer Sensoreinrichtung zur Erfassung von Bewegungen vor der Frontseite
DE102015201026B3 (de) * 2015-01-22 2016-06-16 Konrad Kreuzer Abzugsvorrichtung mit geregelter Absaugeinrichtung
CN204710833U (zh) * 2015-04-10 2015-10-21 阮红正 通风柜
CN106077012B (zh) * 2016-06-03 2018-11-20 安徽育安实验室装备有限公司 一种实验室通风柜
FR3066931B1 (fr) * 2017-05-31 2019-07-19 Claude Bertaux Systeme de fermeture automatique de facade frontale de sorbonnes et enceintes de laboratoire
CN110038417A (zh) * 2019-04-30 2019-07-23 广东赛能科技股份有限公司 一种实验室废气排风系统及处理方法

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EP3919195A1 (fr) 2021-12-08

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