EP2669586B1 - Hotte aspirante - Google Patents

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Publication number
EP2669586B1
EP2669586B1 EP13169523.1A EP13169523A EP2669586B1 EP 2669586 B1 EP2669586 B1 EP 2669586B1 EP 13169523 A EP13169523 A EP 13169523A EP 2669586 B1 EP2669586 B1 EP 2669586B1
Authority
EP
European Patent Office
Prior art keywords
panel
suction hood
cable
suction
valve
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.)
Active
Application number
EP13169523.1A
Other languages
German (de)
English (en)
Other versions
EP2669586A1 (fr
Inventor
Bruno Stancanelli
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.)
ASEM SRL
Original Assignee
Arredi Technici Casarin Srl
ASEM SRL
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 Arredi Technici Casarin Srl, ASEM SRL filed Critical Arredi Technici Casarin Srl
Publication of EP2669586A1 publication Critical patent/EP2669586A1/fr
Application granted granted Critical
Publication of EP2669586B1 publication Critical patent/EP2669586B1/fr
Active 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering

Definitions

  • the invention relates to a suction hood, in particular of the type applied to laboratory workbenches, for example, for chemical analyses.
  • suction hoods In chemical laboratories, the use of suction hoods is known, which are associated with workbenches, to protect operators from the risk of inhaling toxic fumes released during chemical reactions between substances handled by the operators. These suction hoods are suitable for extracting the fumes from the work environment and for conveying these fumes to the outside of the building in which the chemical laboratory is located.
  • Suction hoods of known type comprise a booth provided with frontal sash that acts as a protective screen for the operator.
  • the booth is further provided with a exhaust conduit downstream of which a motor-driven electric fan is arranged.
  • the suction flow of the electric fan may vary according to the flow variations of the air to be sucked on the suction front of the booth, this suction front being defined by the height at which the frontal sash is positioned on the workbench.
  • the first system provides an electronic controller that regulates the flow of the suction hood by varying the rotation speed of the motor of the electric fan by means of an inverter mounted on the motor.
  • the rotation speed of the motor set at a constant value, is changed on the basis of the position of the frontal sash by means of a sensor that sends a signal to the inverter through the electronic controller.
  • This system presents a certain reaction time that is necessary to the inverter to vary the motor speeds and thus the electric fan to reach the speed at which the suction hood can suck the flow of the air corresponding to the desired suction front on the front of the booth.
  • the second system which is usually applied to a plurality of suction hoods in which a sole electric fan is provided on a manifold in which the respective exhaust conduits of each booth converge, provides an electronic controller that regulates the flow of the suction hood through a butterfly valve arranged in each exhaust conduit, driven by a respective electric motor, for example a stepping motor.
  • the position of the butterfly valve determines the flow of the suction hood.
  • the electronic controller regulates the flow of the suction hood by sending a signal to the motor of the butterfly valve, which will open and/or close the corresponding exhaust conduit in function of the speed of the incoming air, i.e. the air measured on the suction front.
  • the speed of the incoming air varies according to the position of the frontal sash and is detected by a suitable sensor connected to the electronic controller.
  • the moment of opening the frontal sash is particularly critical.
  • the reaction time of the electronic controller and of the electric motor of the butterfly valve is not instantaneous and thus there is a high risk of toxic fumes escaping from the booth.
  • US 4,377,969 discloses a laboratory fume hood with open hood face closed by door sash.
  • the fume hood is provided with an automatic airflow control regulating the quantity of air drawn into the hood in response to movement of the door sash for maintaining a controlled velocity of air through the hood face to keep fumes within the hood while reducing energy requirements for either heating or cooling the air to maintain safe operation.
  • the open hood face is controlled by a vertically slidable sash or window counterbalanced by a weight that is connected to the sash by a cable which moves directly proportional to the movement of the sash.
  • This cable actuates mechanism for opening and closing a damper in the exhaust system for the fume hood.
  • the cable drives a pressure regulator which controls an air motor to rotate the damper.
  • the cable may drive reduction gear to the damper or control a servo motor which drives the damper.
  • One object of the invention is to improve suction hoods of known type.
  • a further object is to obtain a suction hood that enables the speed of the sucked air to be maintained constant.
  • Yet another object is to produce a suction hood in which regulation of the flow is substantially instantaneous, thus avoiding the risk that a part of the air to be sucked returns to the environment from which it was taken.
  • Still another object of the invention is to produce a suction hood in which the flow can be regulated by a relatively simple and effective system.
  • a suction hood is provided, as defined by claim 1.
  • the panel is "coupled" with the valve and the position of the latter is variable without delay when the operator drives the panel, for example raises or lowers the panel.
  • the suction hood according to the invention does not have downtime when the volume of air to be sucked is regulated. Consequently, the risk of dangerous fumes escaping during opening of the panel and being inhaled by the operator and by the persons who work in the external environment external to the booth, such as for example a laboratory is thus avoided.
  • the suction hood according to the invention is thus safer for the operator and as there are no electrically supplied devices for regulating the flow, it enables more energy to be saved than with known suction hoods.
  • Figure 1 shows a suction hood 1, in particular of the type applied to workbenches 2 of laboratories, for example for chemical analyses.
  • the suction hood 1 comprises a booth 3, provided internally with a chamber 4, in which containers and laboratory equipment can be housed that are handled by a person or operator P.
  • the suction hood 1 is further provided with a suction device, not shown, such as, for example, an electric fan, that is suitable for removing a fluid from the chamber 4, in particular gas or fumes, that can be released by a chemical reaction that occurs in the chamber 4.
  • a suction device such as, for example, an electric fan, that is suitable for removing a fluid from the chamber 4, in particular gas or fumes, that can be released by a chemical reaction that occurs in the chamber 4.
  • the booth 3 is provided with a front opening 5 connecting the chamber 4 with an external environment outside the booth 3 in which the person P can transit.
  • the booth 3 is further provided with a sliding panel 6 in such a manner as to open or close the front opening 5.
  • the panel 6 is movable between a closed position A, illustrated in Figure 2 , in which the panel 6 substantially closes the front opening 5 to separate the chamber 4 from the external environment, and an open position C, illustrated in Figure 1 and in Figure 6 , in which the panel 6 substantially does not shut the front opening 5.
  • the panel 6 can be locked in different positions interposed between the closed position A and the open position C, as Figure 4 illustrates, in which the panel 6 is in an intermediate position B.
  • the panel 6, that acts as a protection screen for the operator P to protect the operator from the risk of inhaling toxic fumes released during chemical reactions that occur in the chamber 4, is, for example, of transparent glass to enable the operator P to view the chamber 4 even when the panel 6 is in the closed position A, i.e. closes the front opening 5.
  • the panel 6 is slidable vertically and the closed position A of the panel 6 corresponds to a height from the floor in which a lower edge of the panel 6 reaches the level of an upper edge of the workbench 2.
  • the workbench 2 may also not be present.
  • the closed position A of the panel 6 corresponds to a position in which the panel 6 reaches a lower front edge of the booth 3 or the floor level.
  • each up-and-down system comprises a cable 14, having a first end fixed in a known manner and not shown to the panel 6, a pulley 13, and a counterweight 15, fixed in a known manner to a second end of the cable 14 opposite the first end.
  • the two up-and-down systems are placed near opposite sides of the panel 6 and the respective pulleys 13, indicated by the same reference number in Figure 3 , are mounted on side walls opposite one another internally of the booth 3.
  • the booth 3 comprises an exhaust conduit 7 suitable for exhausting externally of the booth 3 the gas or fumes coming from the chamber 4.
  • the exhaust conduit 7 is, in particular, made in an upper wall or ceiling 8 of the booth 3 and is connected in a known manner to the suction device, which sucks smoke, gas or fumes, removing the smoke, gas or fumes from the chamber 4 through the exhaust conduit 7.
  • valve 9 is connected that is suitable for varying a passage section of the exhaust conduit 7 according to the volume of fluid to be removed from the chamber 4.
  • the volume of fluid to be removed from the chamber 4 increases when the panel 6, arranged at a certain initial height, is raised to a higher height, thus freeing a portion increased by the front opening 5.
  • the portion of front opening 5 that is free, i.e. not occupied by the panel 6, defines the suction front.
  • the volume of fluid to be removed from the chamber 4 decreases when the panel 6, arranged at a certain initial height, is moved to a lower height, thus freeing a reduced portion of the front opening 5 and reducing the suction front.
  • the flow of the sucking device is modifiable by a mechanical device 10 that acts on the valve 9.
  • the mechanical device 10 connects the valve 9 and the panel 6 thus enabling mechanical driving of the valve 9.
  • the mechanical device 10 comprises an up-and-down mechanism provided with a cable 16 having an end fixed to one of the two counterweights 15 of one of the two up-and-down systems of the panel 6 and an opposite end fixed to a further counterweight 17.
  • the cable 16 runs on a pair of pulleys, a first pulley 19 and a second pulley 18, fixed to the upper wall 8 inside the booth 3 in such a manner that the respective rotation axes are substantially orthogonal to the plane containing the front opening 5.
  • the first pulley 19 and the second pulley 19 are arranged at a certain distance from one another in such a manner that the further counterweight 17 moves parallel to and near the counterweight 15 that is not connected to the up and-down mechanism.
  • the mechanical device 10 further comprises a thrust member 20 fixed to a portion of the cable 16 interposed between the first pulley 19 and the second pulley 18.
  • the thrust member 20 is arranged for interacting with a first end portion of a driving rod 11 for driving the valve 9.
  • the valve 9 in particular a butterfly valve, comprises a rotation shaft R on which a closing element of the valve 9 is fitted, for example a disc 12, that enables the valve 9 and therefore the exhaust conduit 7 to be opened or closed.
  • a second end portion of the driving rod 11, opposite the first end portion, is fixed to the rotation shaft R of the valve 9, in such a manner that a rotation of the rotation shaft R is matched by a rotation of the driving rod 11, and vice versa.
  • the driving rod 11 forms a preset angle ⁇ with the disc plane 12, as shown in Figure 3 .
  • a first position V1 shown in Figure 3
  • the valve 9 is closed, i.e. the disc 12 is arranged in such a manner as to close the section of the exhaust conduit 7.
  • the driving rod 11 is pressed against the thrust member 20 by a spring, which is not shown, acting on the second end portion of the driving rod 11 with a certain preloading force.
  • the first position V1 of the valve 9 corresponds to the closed position A of the panel 6.
  • the panel 6 is lifted from the closed position A to an intermediate position B, shown in Figure 4 , in which the lower edge of the panel 6 reaches a height K from the workbench 2, the counterweights 15 of the two up-and-down systems of the panel 6 are lowered, as shown in Figure 5 .
  • the counterweight 15 to which the cable 16 is fixed, on the right with reference to Figure 5 drags the cable 16 downwards.
  • the further counterweight 17 weighs less than the counterweight 15 in such a manner as to maintain the cable 16 sufficiently taut without excessively increasing the force that the operator P has to apply to open or close the front opening 5 by the panel 6.
  • the thrust member 20 is removably fixed to the cable 16, in such a manner that the position thereof can be registered along the cable 16 between the first pulley 19 and the second pulley 18.
  • the thrust member 20 can be a clamp that is clamped onto the cable 16 by screws.
  • the mechanical device 10 is shaped in such a manner as to stop regulation of the flow of the valve 9 and maintain the valve 9 in the third maximum opening position V3 of the valve 9.
  • the thrust member 20 By reaching the open position C, corresponding to the third position V3 of maximum opening of the valve, the thrust member 20 is moved to the left until it comes to reach and press on the first end portion of the driving rod 11. By overcoming the force of the spring, the thrust member 20 induces a rotation of the driving rod 11 that makes the disc 12 reduce the passage section of the exhaust conduit 7.
  • the mechanical device 10 thus enables the speed of the air on the suction front to be maintained constant.
  • the mechanical device 10 enables the flow to be adjusted substantially instantaneously by opening or closing the panel 6.
  • the suction hood 1 is thus safer for the operator, because the reaction time, located in the suction hoods of known type, having adjusting devices of the flow supplied electrically, is substantially reduced or even eliminated by the mechanical device 10.
  • the mechanical device 10 enables the risk to be limited that the suction hood does not operate correctly following malfunctions of electrically parts, as occurs in suction hoods of known type.
  • a further advantage of the mechanical device is that, as it has no electric parts, it can be installed in so-called “ATEX” fire-risk zones combined with a “measuring cross” flowrate alarm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Ventilation (AREA)

Claims (6)

  1. Hotte aspirante comprenant une cabine (3), dans laquelle une chambre (4) est définie, et un dispositif d'aspiration destiné à évacuer un fluide de ladite chambre (4), ladite cabine (3) étant pourvue d'une ouverture frontale (5) reliant ladite chambre (4) à un environnement externe dans lequel une personne (P) peut rester à l'extérieur de ladite cabine (3), d'un panneau (6) mobile entre une position de fermeture (A), dans laquelle ledit panneau (6) ferme sensiblement ladite ouverture frontale (5) pour séparer ladite chambre (4) dudit environnement externe, et une position d'ouverture (B ; C), dans laquelle ledit panneau (6) ouvre au moins partiellement ladite ouverture frontale (5), d'un conduit d'évacuation (7) apte à évacuer vers l'extérieur de ladite cabine (3) ledit fluide provenant de ladite chambre (4), d'un clapet (9) pour faire varier une section dudit conduit d'évacuation (7) en fonction du volume dudit fluide à aspirer, ledit clapet (9) étant entraîné par un dispositif mécanique (10) qui relie ledit clapet (9) et ledit panneau (6), caractérisée en ce que ledit dispositif mécanique (10) comprend un mécanisme de montée-descente relié à un autre système de montée-descente dudit panneau (6), ce dernier étant agencé pour permettre audit panneau (6) de coulisser de ladite position de fermeture (A) à ladite position d'ouverture (B ; C), et vice versa ; ledit mécanisme de montée-descente comprenant un câble (16) ayant une première extrémité fixée à un contrepoids (15) dudit système de montée-descente et une seconde extrémité fixée à un autre contrepoids (17) dudit mécanisme de montée-descente ; ledit mécanisme de montée-descente comprenant en outre une première poulie (19) et une seconde poulie (18) autour desquelles ledit câble (16) est au moins partiellement enroulé ; ledit dispositif mécanique (10) comprend en outre une tige d'entraînement (11) ayant une extrémité fixée à un arbre tournant (R) dudit clapet (9) ; ladite tige d'entraînement (11) comprenant une autre extrémité à l'opposé de ladite extrémité et agencée pour interagir avec un organe de poussée (20) prévu dans ledit dispositif mécanique (10) et fixé audit câble (16).
  2. Hotte aspirante selon la revendication 1, dans laquelle lorsque ledit panneau (6) est dans ladite position de fermeture (A) ladite autre extrémité est poussée contre ledit organe de poussée (20) par un ressort agissant sur ladite tige d'entraînement (11) avec une certaine force de précontrainte.
  3. Hotte aspirante selon la revendication 1, ou 2, dans laquelle ledit organe de poussée (20) est fixé à une portion intermédiaire dudit câble (16) entre ladite première poulie (19) et ladite seconde poulie (18) et est déplacé vers ladite première poulie (19) ou vers ladite seconde poulie (18) en compliance avec un mouvement dudit câble (16).
  4. Hotte aspirante selon la revendication 3, dans laquelle la position dudit organe de poussée (20) sur ladite portion intermédiaire est réglable.
  5. Hotte aspirante selon l'une quelconque des revendications 2 à 4, dans laquelle lorsque ledit panneau (6) est dans ladite position d'ouverture (C), correspondant à une ouverture maximale de sécurité (H), ledit ressort est dans une position de repos et ladite autre extrémité n'est pas poussée contre ledit organe de poussée (20).
  6. Hotte aspirante selon la revendication 5, dans laquelle lorsque ledit panneau (6) est ouvert au-dessus de ladite ouverture maximale de sécurité (H), ledit organe de poussée (20) n'interagit pas avec ladite autre extrémité de ladite tige d'entraînement (11).
EP13169523.1A 2012-05-28 2013-05-28 Hotte aspirante Active EP2669586B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000139A ITMO20120139A1 (it) 2012-05-28 2012-05-28 Cappa di aspirazione

Publications (2)

Publication Number Publication Date
EP2669586A1 EP2669586A1 (fr) 2013-12-04
EP2669586B1 true EP2669586B1 (fr) 2017-03-08

Family

ID=46397467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13169523.1A Active EP2669586B1 (fr) 2012-05-28 2013-05-28 Hotte aspirante

Country Status (2)

Country Link
EP (1) EP2669586B1 (fr)
IT (1) ITMO20120139A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015106916A1 (de) * 2015-05-04 2016-11-10 M. Braun Inertgas-Systeme Gmbh Transferventil
IT201700085216A1 (it) * 2017-07-26 2019-01-26 Bicasa Srl Cappa chimica provvista di saliscendi di tipo migliorato
DE102020129412A1 (de) * 2020-11-09 2022-05-12 Lab-Concept GmbH Abzugsvorrichtung mit Volumenstromregelung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE811236A (fr) * 1974-02-19 1974-06-17 Clapet avec son mecanisme de commande pour installations de ventilation de laboratoire.
US4160407A (en) * 1977-11-18 1979-07-10 Bell Telephone Laboratories, Incorporated Ventilating system
US4155289A (en) * 1978-05-25 1979-05-22 Garriss John E Energy conserving laboratory hood
US4215627A (en) * 1978-12-29 1980-08-05 Garriss John E Energy conserving laboratory hood system
GB2072331B (en) * 1980-03-24 1983-01-06 A C Plastic Ind Enclosures with a gas extraction system
US4377969A (en) * 1980-12-08 1983-03-29 Kewaunee Scientific Equipment Corp. Automatic fume hood airflow control
US5382192A (en) * 1993-07-02 1995-01-17 Classic Modular Systems, Inc. Damper control apparatus
DE29915191U1 (de) * 1999-08-30 1999-12-09 Gebrüder Trox, GmbH, 47506 Neukirchen-Vluyn Luft-Volumenstromregler für Sicherheitseinrichtungen, insbesondere für Laborabzüge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2669586A1 (fr) 2013-12-04
ITMO20120139A1 (it) 2013-11-29

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