NL2020831B1 - Laboratory suction hood - Google Patents

Laboratory suction hood Download PDF

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Publication number
NL2020831B1
NL2020831B1 NL2020831A NL2020831A NL2020831B1 NL 2020831 B1 NL2020831 B1 NL 2020831B1 NL 2020831 A NL2020831 A NL 2020831A NL 2020831 A NL2020831 A NL 2020831A NL 2020831 B1 NL2020831 B1 NL 2020831B1
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NL
Netherlands
Prior art keywords
extractor hood
hood
housing
air
suction
Prior art date
Application number
NL2020831A
Other languages
Dutch (nl)
Other versions
NL2020831A (en
Inventor
Pagano Luca
Original Assignee
Omicron Italia S R L
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 Omicron Italia S R L filed Critical Omicron Italia S R L
Publication of NL2020831A publication Critical patent/NL2020831A/en
Application granted granted Critical
Publication of NL2020831B1 publication Critical patent/NL2020831B1/en

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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
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
    • F24F3/163—Clean air work stations, i.e. selected areas within a space which filtered air is passed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L1/00—Enclosures; Chambers
    • B01L1/04—Dust-free rooms or enclosures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
    • B01L2200/08—Ergonomic or safety aspects of handling devices
    • B01L2200/085—Protection against injuring the user
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2400/00—Moving or stopping fluids
    • B01L2400/04—Moving fluids with specific forces or mechanical means
    • B01L2400/0475—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure
    • B01L2400/0487—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure fluid pressure, pneumatics
    • B01L2400/049—Moving fluids with specific forces or mechanical means specific mechanical means and fluid pressure fluid pressure, pneumatics vacuum

Abstract

The present invention relates to a suction hood, in particular of the type used in chemical and biological laboratories. In particular, the invention relates to a suction hood (1) comprising a body (2) which encloses a work space (3) open at a front side (8d) and comprising a work plane (5) having a front portion (5’), wherein the work space (3) is in flow communication with suction means (17) adapted to convey air, fumes and/or vapors from the work space (3) to an evacuation duct (16), characterized in that the suction hood (1) comprises means (18) for delivering a vertical air flow, arranged at the front side (8d) ofthe body (2) and facing downwards, so as to convey an air curtain onto the front portion (5’) ofthe work plane (5).

Description

Description
The present invention relates to a suction hood, in particular of the type used in chemical and biological laboratories.
Chemical and biological processes which imply a given risk for the safety and health of operators and of the environment must be performed under specific suction hoods. Such suction hoods, which may be of different type, in particular for normal processes or for distillation (i.e. with lowered platform) or without platform (the so-called walk-in suction hoods), are characterized by a base on which a platform rests, a work space placed over the platform and surrounded by side and bottom walls and by a front wall made of glass or similartransparent material, which is slidable such as to allow the closing and the partial or total opening, and finally by a roof, which forms the hood itself, which comprises an air, gas and fume evacuation duct provided with appropriate suction means. The evacuation duct conveys air, gas and fumes out of the building in which the laboratory is housed, normally after passing through appropriate pollutant filtering and/or abatement systems.
In this type of suction hoods, the airflow aspirated from the environment of the laboratory by the suction means must be sufficiently high to prevent the pollutants present under the hood from exiting frontally, whereby invading the laboratory environment. In other words, an air flow directed univocally from the environment of the laboratory towards the work space under the hood and from here towards the evacuation duct must be established. In order to ensure the aforesaid isolation of the environment laboratory, it can be calculated that a conventional suction hood must work with flow rates from about 650 to about 1100 m3/hr.
The need is therefore felt to provide a suction hood which can ensure an optimal protection for the operator and for the laboratory environment as a whole, while minimizing energy consumption related to its use.
Such a drawback is solved by a suction hood as outlined in the appended claims, the text of which implicitly forms an integral part of the present description.
Further features and advantages of the present invention will become apparent from the description of some exemplary embodiment, given here by way of non-limiting example, with reference to the following drawings:
Figure 1 is a perspective view of a first embodiment of the suction hood of the invention;
Figure 2 is a perspective view of a second embodiment of the suction hood of the invention;
Figures 3A and 3B show section side views of a particular of the suction hood of the invention, in two different operating conditions;
Figure 4 is a perspective view of a third embodiment of the suction hood of the invention.
With reference to figure 1, the suction hood according to the invention, indicated by reference numeral 1 as a whole, comprises a body 2 which encloses a work space 3.
The body 2 comprises a base block 4 having a work plane 5 on top which forms the lower surface of the work space 3. The base block 4 may be provided with doors 6, which allow the access to an inner space to stow materials or instruments and may comprise knobs, switches or other controls 7 for switching on, adjusting or controlling light, suction or other installations with which the hood may be provided.
In some embodiments, in particular in hoods of the so-called walk-in type, the base block 4 is missing, so that the work plane 5 coincides with the floor surface of the hood. However, in the present description, the expression “work plane” in the case of walk-in hoods will also mean this floor surface.
The body 2 further comprises side wall 8a, rear wall 8b and upper wall 8c, which delimit the work space 3 on four sides, while the front side 8d is open.
A lifting-lowering panel 9 made at least in part of transparent material, such as for example glass, crystal or polymeric material, is slidingly mounted on the front side of the body 2. The liftinglowering panel 9 allows the total closing or partial or total opening of the front side of the body 2, allowing operative access to the work space 3 and, in all cases, the visual access to it, i.e. also with the panel all down.
As shown in figure 3A, the lifting-lowering panel 9 comprises a counter-weight member 10 which comprises a counter-weight 11 connected to the panel 9 by system of rope 12 and pulley 13, which allows, in an entirely conventional manner, to position the lifting-lowering panel 9 at the required working height. The working height is allowed from the lower position of the lifting-lowering panel to a maximum of 60 cm from the work plane. Typically, the operator works with the liftinglowering panel at 50 cm from the work plane.
The counter-weight member 10 further comprises stop means 14 connected to the cable 12, so as to prevent the lifting-lowering panel 9 from suddenly dropping if the cable 12 breaks (figure 3B).
Such stop means 14 are known and may be, for example, similar to those conventionally used as stop means of the rolling shutters. They comprise a lever 15 actuated by a spring which, when the cable 12 tears, triggers the lever 15 to the extended position (figure 3E3), so as to fit in suitable notches (not shown) present on the edge of the walls 8a, 8b of the body 2.
The upper wall 8c of the body 2 comprises a hole from which an air, fume and vapor evacuation duct 16 departs. The evacuation duct 16 comprises suction means 17, e.g. a suction fan, typically at the hole of the upper wall 8c.
The evacuation duct 16 conveys the air, the fumes and/or the vapors towards the outside of the building and typically comprises a treatment system (filtering, abatement etc.).
The suction hood 1 described hereto is entirely conventional.
The suction hood 1 of the invention further comprises means 18 for delivering a vertical air flow, arranged at the front side 8d of the body 2 and facing downwards, so as to convey an air curtain onto the front portion 5’ of the work plane 5.
In the embodiment shown in figure 1, the delivery means 18 are placed in a housing 19 obtained under the front portion 8c’ of the upper wall 8c of the body 2. Such a housing 19 comprises an air intake, e.g. a grid (not shown), for aspirating air from the laboratory environment.
The housing 19 may be positioned immediately under the upper wall 8c or, preferably, in a lower position, typically on the level of the working height of the lifting-lowering panel 9, which, as mentioned, is normally between 40 and 60 cm from the work plane 5.
In the embodiment shown in figure 2, the housing 19’ of the delivery means 18 is positioned on the inner face of the lifting-lowering panel 9, near its lower edge 9’.
The delivery means 18 comprise one or more fans (five in figure 1 and three in figure 2) or similar ventilation devices.
As shown by the arrows in the figures, the air curtain is sent by the delivery means 18 towards the front portion 5’ of the work plane 5, and thus - by virtue of the suction operated by the suction means 17 connected to the evacuation duct 16 - is directed towards the inside of the work plane 5, and thus aspirated upwards by said suction means 17.
In some embodiments (not shown in the drawings), the front portion 5’ of the work plane 5 comprises a suction grid, so as to create a vertical air curtain which separates the work space 3 from the external environment of the laboratory.
In the embodiment shown in figure 4, the suction hood 201 is configured so as to create a frontal air curtain directed from the bottom upwards.
Therefore, such an embodiment comprises delivery means 18’, also in this case chosen from one or more fans or similar ventilation devices arranged with the delivery opening facing upwards.
The delivery means 18’ are contained in a housing 19” arranged under the front portion 5’ of the work plane 5. The front portion 5' comprises, in this case, a delivery grid 20 from which air exits to form an air curtain which partially separates the work space 3 from the external environment before being aspirated by the suction means 17.
One or more suction grids 21 of a portion of air from the external environment on the front and/or on the sides of the base block 4, at the housing 19”.
The housing 19, 19’, 19” preferably has a length extension substantially equal to the width of the front side 8d of the body 2 and a depth of about 3-10 cm.
For the purposes of correct operation of the suction hood 1, the flow rate of the delivery means 18,18’ must be slower than the flow rate of the suction means 17. So, a given amount of air will be aspirated directly through the front opening of the hood 1,101,201, so as to avoid absolutely the release of polluted air towards the laboratory; however, such an amount is considerably reduced by virtue of the air curtain which creates a barrier effect.
It can be calculated that for a suction hood of standard size, e.g. with a work space of about 1 m3 or slightly larger, the flow rate aspirated by the suction means 17 will be, for example, of SOO31 0 m3/hr, while in a traditional suction hood, i.e. without the delivery means 18, it will be generally from 650 to 1100 m3/hr.
In the case shown herein, the flow rate of the supply means 18 may be, for example, of 200-210 m3/hr. However, it will be possible to appropriately size the air flows by reducing the aspirated flow up to 50 m3/hr and the air curtain to about 30 m3/hr without because of this penalizing the protection of the operator and of the laboratory environment.
Conversely, in a 1200 mm wide traditional suction hood, with a lifting-lowering panel positioneel at a working height of 50 cm and thus with an air entry section of 0.6 m2, the inlet suction flow may vary from 0.3 m/s to 0.7 m/s, so as to create a front protection barrier for the operator. Also calculating the slow suction speed of 0.3 m/s, the flow rate will be 0.3 x 0.6 x 3600 = 648 m3/hr.
The advantages of the suction hood 1 of the invention are not simply less consumption of electricity of the suction means 17 and the delivery means 18, but also concern air conditioning costs (cooling in summer and heating in winter) of the laboratory environment. For example, according to the calculation performed above, a saving from 350 to 800 m3/hr of conditioned air can be obtained with respect to a traditional suction hood.
It is apparent that only some particular embodiments of the present invention have been described, to which those skilled in the art will be able to make all changes required to adapt it to particular applications, without departing from the scope of protection of the present invention.
P6075670

Claims (13)

ConclusiesConclusions 1. Afzuigkap (1, 101, 201) die een lichaam (2) omvat, dat een werkruimte (3) omgeeft, die open is aan een voorzijde (8d) en een werkvlak (5) omvat met een voorste gedeelte (5j, waarbij de werkruimte (3) in luchtstroomverbinding staat met een afzuigmiddel (17), dat is aangepast om lucht, uitwaseming en/of dampen van de werkruimte (3) naar een afvoerkanaal (16) te transporteren, met het kenmerk dat de afzuigkap (1) middelen (18, 18 j omvat voor het leveren van een verticale luchtstroom, die aan de voorzijde (8d) van het lichaam (2) of van het voorste gedeelte (5j van het werkvlak (5) zijn geplaatst, en die respectievelijk ofwel naar beneden of naar boven zijn gekeerd, om zo een luchtgordijn te creëren, dat is vormgegeven om de werkruimte (3) te scheiden van een externe omgeving.An extractor hood (1, 101, 201) comprising a body (2) surrounding a working space (3) which is open at a front (8d) and comprises a working surface (5) with a front part (5j), the work space (3) is in air flow communication with an extractor (17) adapted to transport air, fumes and / or vapors from the work space (3) to a discharge channel (16), characterized in that the extractor hood (1) means (18, 18 j) for supplying a vertical air flow, which are placed on the front side (8d) of the body (2) or of the front part (5j of the working surface (5), and which are respectively downwards or turned upwards to create an air curtain designed to separate the workspace (3) from an external environment. 2. Afzuigkap (1, 101, 201) volgens conclusie 1, waarbij de stroomsnelheid van de leveringsmiddelen (18, 18’) langzamer is dan de stroomsnelheid van het afzuigmiddel (17).The extractor hood (1, 101, 201) according to claim 1, wherein the flow rate of the delivery means (18, 18 ') is slower than the flow rate of the extraction means (17). 3. Afzuigkap (1, 101,201) volgens conclusie 1 of 2, waarbij het lichaam (2) een basisblok (4) omvat, dat aan de bovenkant het werkvlak (5) omvat, en een zijwand (8a), achterwand (8b) en bovenwand (8c), en waarbij een gedeeltelijk of geheel transparant op-en-neergaand paneel (9) verschuifbaar is bevestigd aan de voorzijde (8d) van het lichaam (2).Extractor hood (1, 101,201) according to claim 1 or 2, wherein the body (2) comprises a base block (4) which comprises the working surface (5) at the top, and a side wall (8a), rear wall (8b) and top wall (8c), and wherein a partially or fully transparent up-and-down panel (9) is slidably attached to the front (8d) of the body (2). 4. Afzuigkap (1, 101,201) volgens conclusie 1 of 2, waarbij de kap van het inlooptype is en waarbij het werkvlak (5) samenvalt met een bodemoppervlak van de kap.Extractor hood (1, 101,201) according to claim 1 or 2, wherein the hood is of the run-in type and wherein the working surface (5) coincides with a bottom surface of the hood. 5. Afzuigkap (1, 101,201) volgens een van de conclusies 1 tot en met 4, waarbij het op-enneergaande paneel (9) een contragewichtorgaan (10) omvat, dat een contragewicht (11) omvat, dat is verbonden met het paneel (9) door een systeem van kabel (12) en katrollen (13).The extractor hood (1, 101,201) according to any of claims 1 to 4, wherein the ascending panel (9) comprises a counterweight member (10) which includes a counterweight (11) connected to the panel ( 9) through a system of cable (12) and pulleys (13). 6. Afzuigkap (1, 101, 201) volgens conclusie 5, waarbij het contragewichtorgaan (10) een stopmiddel (14) omvat, dat is verbonden met de kabel (12), zodat wordt voorkomen dat het op-en-neergaande paneel (9) plotseling naar beneden valt als de kabel (12) breekt.The extractor hood (1, 101, 201) according to claim 5, wherein the counterweight member (10) comprises a stopping means (14) connected to the cable (12) so that the up-and-down panel (9) is prevented. ) suddenly falls down when the cable (12) breaks. 7. Afzuigkap (1, 101,201) volgens conclusie 6, waarbij het stopmiddel (14) een hefboom (15) omvat, die wordt aangedreven door een veer, die, wanneer de kabel (12) scheurt, de hefboom (15) aanzet om naar de uitgestrekte positie te gaan, om zo in de daarvoor geschikte inkepingen te passen, die aanwezig zijn op de rand van de zijwanden (8a, 8b) van het lichaam (2).The extractor hood (1, 101,201) according to claim 6, wherein the stopping means (14) comprises a lever (15) driven by a spring which, when the cable (12) breaks, turns the lever (15) to to go into the extended position, so as to fit into the notches suitable for this, which are present on the edge of the side walls (8a, 8b) of the body (2). 8. Afzuigkap (1) volgens een van de conclusies 1 tot en met 7, waarbij de leveringsmiddelen (18) zijn geplaatst in een behuizing (19), die is gevormd onder het voorste gedeelte (8cj van de bovenwand (8c) van het lichaam (2), waarbij de behuizing (19) een luchtinlaat, bijvoorbeeld een rooster, omvat voor het opzuigen van lucht uit de laboratoriumomgeving.Extractor hood (1) according to one of claims 1 to 7, wherein the delivery means (18) are placed in a housing (19) formed under the front part (8cj of the upper wall (8c) of the body (2), wherein the housing (19) comprises an air inlet, for example a grid, for sucking in air from the laboratory environment. 9. Afzuigkap volgens conclusie 8, waarbij de behuizing (19) op het werkhoogteniveau van het op-en-neergaande paneel (9) is gepositioneerd.The extractor hood according to claim 8, wherein the housing (19) is positioned at the working height level of the up and down panel (9). 10. Afzuigkap (101) volgens een van de conclusies 1 tot en met 7, waarbij de leveringsmiddelen (18) in een behuizing (19’) zijn geplaatst, die op het binnenvlak van het op-en-neergaande paneel (9) is geplaatst, nabij de onderrand (9 j ervan.Extractor hood (101) according to one of claims 1 to 7, wherein the delivery means (18) are placed in a housing (19 ') which is placed on the inner surface of the up-and-down panel (9) , near the lower edge (9 years thereof). 11. Afzuigkap (201) volgens een van de conclusies 1 tot en met 7, waarbij de leveringsmiddelen (18’) in een behuizing (19”) zijn geplaatst, die onder het voorste gedeelte (5j van het werkvlak (5) is gepositioneerd, en waarbij het voorste gedeelte (5j van het werkvlak (5) een afleveringsrooster (20) omvat, en de voor- en/of achterzijden van het basisblok (4) een of meer afzuigroosters (21 bij de behuizing (19”) omvatten.Extractor hood (201) according to one of claims 1 to 7, wherein the delivery means (18 ') are placed in a housing (19 ”) positioned under the front part (5j of the working surface (5), and wherein the front portion (5j of the work surface (5) comprises a delivery grid (20), and the front and / or rear sides of the base block (4) comprise one or more suction gratings (21 at the housing (19 '). 12. Afzuigkap (1,101,201) volgens een van de conclusies 8 tot en met 11, waarbij de behuizing (19, 19’, 19”) een lengte-uitbreiding heeft, die wezenlijk gelijk is aan de breedte van de voorzijde (18d) van het lichaam (2) en een diepte van ongeveer 3 tot 10 cm.The extractor hood (1,101,201) according to any of claims 8 to 11, wherein the housing (19, 19 ', 19 ”) has a length extension that is substantially equal to the width of the front (18d) of the body (2) and a depth of about 3 to 10 cm. 13. Afzuigkap volgens een van de conclusies 1 tot en met 12, waarbij de leveringsmiddelen (18, 18’) een of meer ventilatoren of dergelijke ventilatie-inrichtingen omvatten.The extractor hood according to any of claims 1 to 12, wherein the delivery means (18, 18 ') comprise one or more fans or similar ventilation devices. 1/51/5
Figure NL2020831B1_C0001
Figure NL2020831B1_C0001
NL2020831A 2017-04-27 2018-04-26 Laboratory suction hood NL2020831B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102017000045556A IT201700045556A1 (en) 2017-04-27 2017-04-27 LABORATORY ASPIRATING HOOD

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NL2020831B1 true NL2020831B1 (en) 2020-01-13

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EP (1) EP3395453B1 (en)
ES (2) ES2901459T3 (en)
FR (1) FR3065787B3 (en)
IT (1) IT201700045556A1 (en)
NL (1) NL2020831B1 (en)
PL (1) PL127284U1 (en)
RO (1) RO201800019U3 (en)

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CN114433269A (en) * 2022-03-01 2022-05-06 张银花 Central experiment table that intelligence was ventilated

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ES2901459T3 (en) 2022-03-22
EP3395453A1 (en) 2018-10-31
NL2020831A (en) 2018-11-02
FR3065787B3 (en) 2019-12-13
FR3065787A3 (en) 2018-11-02
RO201800019U3 (en) 2024-03-29
ES1212590U (en) 2018-05-18
EP3395453B1 (en) 2021-10-20
RO201800019U2 (en) 2019-01-30
IT201700045556A1 (en) 2018-10-27
PL127284U1 (en) 2018-11-05

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