EP2564948A1 - Extractor and method for reducing the concentration of hazardous materials - Google Patents

Abstract

The flue (100) has housing which is formed by a bottom portion (20), rear wall (26), side walls (28), ceiling (30) and front face (32). An openable/closable window element (34) is provided in the front face of housing. The suction openings (40,42) for suction of exhaust air, are formed in rear portion and lateral region of housing, respectively. An air deflection device (50) for injecting supply air (Z) into a workspace (14), is provided between front face and bottom portion. The air deflection device is provided with equally spaced apertures through which air is flowed. An independent claim is included for method of reducing pollutant concentration.

Description

• einen als Arbeitsfläche fungierenden Boden,
• eine Rückwand,
• zwei Seitenwände,
• eine Decke,
• eine Frontseite, der mindestens ein zur Arbeitsfläche hin öffenbares und schließbares Fensterelement zugeordnet ist, und
• im hinteren Bereich des Gehäuses sowie im seitlichen Bereich des Gehäuses angeordnete Absaugöffnungen zur Absaugung von Abluft
  aufweist, wobei dem der Frontseite zugewandten Bereich des Bodens mindestens eine Luftumlenkeinrichtung zur Einblasung von Zuluft in den Arbeitsraum zugeordnet ist,

The present invention relates to a trigger, in particular for a laboratory workstation or the like, with a chamber-shaped working space defining box-shaped housing, the

• a floor acting as a work surface,
• a back wall,
• two side walls,
• A blanket,
• a front side, which is associated with at least one openable to the work surface and closable window element, and
• in the rear of the housing and in the lateral region of the housing arranged suction for the extraction of exhaust air
  wherein the region of the bottom facing the front side is assigned at least one air deflecting device for injecting supply air into the working space,

The present invention further relates to a corresponding method for reducing the, in particular at a laboratory workstation or the like, existing pollutant concentration by means of at least one such deduction.

State of the art

The work with hazardous substances in the laboratory and the lecture hall is governed by many regulations which - according to the state of science and technology - are repeatedly changed or interpreted differently.

In order to guarantee the protection of employees and learners in compliance with legal requirements and to optimize efficient work with critical substances, deductions of the type mentioned in the beginning (see, for example, publication no DE 10 2008 030 029 A1 from the prior art; see. on the technological background of prints, for example also the pamphlets DE 103 38 284 A1 or DE 103 38 287 from the prior art) developed steadily.

For example, the European standard DIN EN 14175, as one of the relevant statutory requirements, places particular demands on all new fume cupboards (with the exception of the so-called fumigant and fume hoods in accordance with DIN 12924 Parts 2 and 3). The most important requirements of DIN EN 14175 relate to the retention capacity, according to which deductions prevent any resulting pollutants from escaping and must retain them in the fume hood. With regard to the robustness of the flow function, external influences, such as a draft or the movement of persons, must not affect the performance of the fume cupboard.

In order to meet these legal requirements, the energy consumption of such fume hoods is high due to the need for strong injection combined with efficient extraction, which is no longer considered up-to-date given rising energy prices and growing environmental awareness.

Presentation of the present invention: object, solution, advantages

Based on the disadvantages and inadequacies set out above and in appreciation of the state of the art outlined, the present invention has the object, a deduction of the type mentioned and a method of the type mentioned in such a way that the energy consumption is as low as possible.

This object is achieved by a trigger with the features specified in claim 1 and by a method having the features specified in claim 12. Advantageous embodiments and expedient developments of the present invention are characterized in the respective subclaims.

The trigger according to the present invention is particularly intended for a laboratory workstation or the like and has a box-shaped housing, through which a chamber-shaped working space is limited.

Optionally, this housing can be placed on a cabinet and form a structural unit with this. In other embodiments, however, can also be dispensed with such a cabinet.

• einen als Arbeitsfläche fungierenden Boden,
• eine Rückwand, der optionalerweise mindestens eine Prallwand vorgelagert sein kann,
• zwei Seitenwände,
• einen Deckenbereich,
• eine Frontseite, der mindestens ein zur Arbeitsfläche hin öffenbares und schließbares Fensterelement zugeordnet ist, und
• im hinteren Bereich des Gehäuses sowie im seitlichen Bereich des Gehäuses angeordnete Absaugöffnungen zur Absaugung von Abluft

auf.The housing defines a chamber-shaped working space and has for this purpose

• a floor acting as a work surface,
• a back wall, which optionally may be preceded by at least one baffle,
• two side walls,
• a ceiling area,
• a front side, which is associated with at least one openable to the work surface and closable window element, and
• in the rear of the housing and in the lateral region of the housing arranged suction for the extraction of exhaust air

on.

Here, in relation to the present invention, the side of the fume hood, at which an opening for accessing the working chamber or the working space is provided, referred to as the front side. However, the remaining sides of the housing may nonetheless be configured with transparent walls, so that a view of the interior of the working chamber or of the working space is possible from each side including the back. In other embodiments, observation of the working chamber or working space may be possible only from a front side.

The front of the facing region of the bottom of the working chamber or the working space is associated with at least one Luftumlenkeinrichtung for injection of supply air into the working chamber or in the working space. According to the invention, the Luftumlenkeinrichtung at least two mutually spaced Lufteinströmöffnungen, which allows an energy-saving manner an individual and selective control and regulation of the supply of fresh air or supply air into the working chamber or in the working space.

The Luftumlenkeinrichtung is not a hollow airfoil part, that is not designed as a hollow profile; Also, the trigger according to the present invention on the side walls no hollow airfoil parts, that is no hollow profile.

• über zumindest einen Abschnitt, insbesondere über die gesamte, der durch den Abstand der beiden Seitenwände zueinander definierten Gehäusebreite und/oder
• im Wesentlichen parallel zur der Frontseite zugewandten Kante der Arbeitsfläche,
  was für sich genommen oder in Kombination eine gleichmäßige und konstante Einblasung der Zuluft in die Arbeitskammer oder in den Arbeitsraum gewährleistet.

Rather, the Luftumlenkeinrichtung extends in an advantageous manner

• via at least one section, in particular over the entire, by the distance of the two side walls defined to each other housing width and / or
• substantially parallel to the front facing edge of the work surface,
  which, taken alone or in combination, ensures a uniform and constant injection of the supply air into the working chamber or into the working space.

• mit einem nicht gebogenen Basisteil und
• mit einem gebogenen, die Zuluft umlenkenden Umlenkteil

ausgebildet.According to an expedient development, the Luftumlenkeinrichtung is as a profile

• with a non-curved base part and
• with a bent, the supply air deflecting deflection

educated.

• können die Lufteinströmöffnungen im Wesentlichen gleichmäßig zueinander beabstandet sein und/oder
• können die der Seitenwand nächstgelegenen Lufteinströmöffnungen gleichmäßig von dieser Seitenwand beabstandet sein,

um eine gleichverteilte Einblasung der Zuluft in die Arbeitskammer oder in den Arbeitsraum zu gewährleisten.The air inflow openings are preferably in the base part, in particular in the deflection part facing portion of the base part, arranged. Regardless or in connection herewith

• the air inflow openings can be substantially uniformly spaced from each other and / or
• the airflow openings closest to the side wall may be evenly spaced from this side wall,

to ensure an equally distributed injection of the supply air into the working chamber or into the working space.

Preferably, the, in particular, each, air inlet is associated with at least one fan for acting on the Luftumlenkeinrichtung with air, which allows an energy-saving manner an individual and selective control and regulation of the supply of fresh air or supply air into the working chamber or in the working space.

According to a particularly expedient development of the present invention, the intensity of the supply of each air inlet opening with supply air is thus selectively controllable and / or controllable, because the air supply for the injection is not centrally, but by means of the respective at least one decentralized fan at the respective inflow or on respective blowing slot.

The method according to the present invention is based on the fact that the fresh air or supply air is blown into the working chamber or into the working space by means of at least two spaced-apart air inflow openings.

• dass bei verstärkter Absaugung die Intensität der Einblasung herabgesetzt wird oder
• dass bei verminderter Absaugung die Intensität der Einblasung gesteigert wird.

In an energy-saving manner, the extraction of the exhaust air can be controlled and / or controlled as a function of or in cooperation with the injection of the supply air, for example, in such a way,

• that with increased suction the intensity of the injection is reduced or
• that with reduced suction the intensity of the injection is increased.

Preferably, the trigger not only a rear, but a spatial, in particular also lateral suction. The suction is therefore not limited to the rear or rear wall of the trigger, which has the effect of energy-saving effect, as less injection is required, namely only at the edge of the table or work table, but not on the side walls of the trigger.

In this way, the injection can be linked to the trigger control, so that the Discharge can be operated with the lowest possible amount of air, which is pleasing in terms of energy conservation.

In a preferred manner, the suction extending also on the side walls can be spatially controlled and / or controlled, for example as a function of or in cooperation with the blowing-in which is selective by means of the decentralized fans. In this case, the intensity of the supply of each air inlet opening with supply air is expediently selectively controllable and / or controllable, for example as a function of the degree and / or the spatial distribution of the exhaust air extraction.

Finally, the present invention relates to the use of at least one trigger of the kind set out above and / or a method of the kind set forth above for reducing the pollutant concentration at a laboratory workstation or the like.

Brief description of the drawings

As already discussed above, there are various possibilities for embodying and developing the teaching of the present invention in an advantageous manner. For this purpose, reference is made on the one hand to the claim 1 and the claim 12 subordinate claims, on the other hand, further embodiments, features and advantages of the present invention, inter alia, with reference to the by Fig. 1 to Fig. 3 illustrated embodiments explained in more detail.

Fig. 1

eine geschnittene Seitenansicht eines Ausführungsbeispiels eines Abzugs gemäß der vorliegenden Erfindung, der nach dem Verfahren gemäß der vorliegenden Erfindung arbeitet;

Fig. 2A

eine Vorderansicht eines Ausführungsbeispiels der als Zuluftprofil ausgebildeten Luftumlenkeinrichtung des Abzugs aus Fig. 1;

Fig. 2B

eine Aufsicht auf das Zuluftprofil aus Fig. 2A;

Fig. 2C

eine perspektivische Ansicht des Zuluftprofils aus Fig. 2A, Fig. 2B in vergrößerter Darstellung mit exemplarischen Winkelangaben (in Grad) sowie mit exemplarischen Bemessungsangaben (in Millimeter);

Fig. 2D

eine vergrößerte Seitenansicht des Zuluftprofils aus Fig. 2A, Fig. 2B, Fig. 2C;

Fig. 3

eine stark vergrößerte Detailansicht eines Ausführungsbeispiels der Einströmschlitze des Zuluftprofils aus Fig. 2A, Fig. 2B, Fig. 2C, Fig. 2D.

Show it:

Fig. 1

a sectional side view of an embodiment of a trigger according to the present invention, which operates according to the method according to the present invention;

Fig. 2A

a front view of an embodiment of the formed as Zuluftprofil air deflection of the trigger Fig. 1 ;

Fig. 2B

a view of the Zuluftprofil from Fig. 2A ;

Fig. 2C

a perspective view of the supply air profile Fig. 2A, Fig. 2B on an enlarged scale with exemplary angle data (in degrees) and with exemplary design data (in millimeters);

Fig. 2D

an enlarged side view of the supply air profile Fig. 2A, Fig. 2B, Fig. 2C ;

Fig. 3

a greatly enlarged detail of an embodiment of the inflow of the Zuluftprofils FIGS. 2A, 2B, 2C, 2D ,

Same or similar embodiments, elements or features are in Fig. 1 to Fig. 3 provided with identical reference numerals.

Best way to carry out the present invention

Fig. 1 to Fig. 3 illustrate the basic operation of the present invention, which is intended to reduce the pollutant concentration at a laboratory workstation and in principle based on an attachable to the user facing edge 22 of a worktop 20 Zuluftprofil 50.

The in Fig. 1 shown deduction 100 is placed on a cabinet 10 with foot 12 and forms with this a structural unit. In other embodiments, a lower cabinet 10 can be dispensed with.

The trigger 100 has on the lower cabinet 10 a box-shaped housing which limits a working chamber or a working space 14. At least one connection for a suction device is provided in the rear region of the working chamber or of the working chamber 14, wherein the suction opening 40 in accordance with FIG Fig. 1 is arranged behind a baffle 24.

On the front side 32 of the housing, a head cover is provided, which does not extend over the entire height of the working chamber or the working space 14, so that the trigger 100 on the front 32 has an opening which is defined by at least one, preferably two or three, Sliding window 34 can be opened and closed is / are.

It should be noted that in the sense of the sash limiter according to DIN standard EN 14175, the opening of the front sliding window (s) 34 is limited to half a meter. For further opening, the sash is intentionally unlocked by the user, for example by means of the grip element 36.

In the embodiment according to Fig. 1 Thus, the housing of the trigger 100 is at least one, preferably two or three, in particular vertically displaceable window elements 34. For moving the window elements 34, groove guides 38 can be provided, in which the window elements 34 are displaceably mounted.

In this case, the window elements 34 are preferably displaceable in such a way that all the window elements 34 in a central region of the trigger 100 can be pushed against each other at least partially overlapping. This makes it possible for a user to move the window elements 34 in the central region and to move his arms through an access opening thus obtained in the interior of the working space or the working chamber.

In spite of access to the interior, the user's body remains protected by the window elements 34 arranged in the middle region. However, embodiments are also conceivable in which a central area is made accessible by displacing the window elements.

In a partial opening by moving individual window elements 34, it is particularly advantageous that a pollutant outbreak on the side walls 28 by the arranged in the lateral region exhaust air extraction openings 42 is reliably prevented, because the trigger 100 according to Fig. 1 also has an exhaust 42 in the side walls 28.

The suction is therefore not limited to the rear or rear wall 26 of the trigger 100; this has energy-saving effect, as less injection is required, namely only on the table edge 22 of the work table or floor 20th

In addition, it is ensured by the lateral suction 42 that a collection of pollutants in the housing not only at the bottom 20 of the working chamber or the working chamber 14, but also the side walls 28 is prevented in a reliable manner.

According to the embodiment Fig. 1 Furthermore, it can be seen that the area of the working surface or the base 20 facing the front side 32 is assigned an air deflection device 50 designed as a supply air profile for injecting supply air Z into the working space or into the working chamber 14.

This extending almost over the entire (by the distance between the two side walls 28 to each other) housing width extending parallel to the front side 32 facing edge 22 of the work surface extending Zuluftprofil 50 is not as a hollow profile formed, but as a curved, so the Zuluft Z deflecting profile formed (see, not only Fig. 1 , but in particular also the deflection part 60 in Fig. 2C, Fig. 2D ).

At this bent deflecting part 60, a non-bent base member 52 connects, the exemplary in Fig. 2B, Fig. 2C has five spaced air inlet openings 56, wherein according to the detailed view in Fig. 3 Each of the five inflow openings 56 has, by way of example, seven inflow slots 58 of different lengths.

Furthermore, the Zuluftprofil 50 in its non-bent base part 52, in particular in the remote from the deflecting 60 free end portion of the base member 52, at least two, by way of example in Fig. 2B, Fig. 2C six recesses or holes for attachment of the Zuluftprofils 50 on the table edge 22 of the work table or floor 20.

The inflow openings 56 are uniformly spaced from one another in the region of the base part 52 facing the deflecting part 60 (cf. Fig. 2B, Fig. 2C ), and the two outer inlet openings 56 have the same distance to the respective side wall 28 of the trigger 100 as the inlet openings 56 with each other (see. Fig. 2B, Fig. 2C ).

In the sense of a decentralized supply of the working chamber or of the working space 14 with fresh air or supply air, each of these five inlet openings 56 is in each case a ventilator 70 (cf.

Fig. 1 ) assigned to the Luftumlenkeinrichtung 50 with air; by the action of these fans 70, the total injection is realized.

The intensity of the supply of each air inlet opening 56 with supply air Z is selectively controllable and / or controllable; More specifically, the extraction of the exhaust air is controlled and / or controlled as a function of or in cooperation with the injection of the incoming air Z, which is positive in terms of energy saving.

LIST OF REFERENCE NUMBERS

100

deduction

10

cabinet

12

Foot part of the cabinet 10

14

Working chamber or working space

20

Worktop or floor

22

front edge of worktop or floor 20

24

baffle wall

26

Rear or back wall

28

Side wall

30

Ceiling or ceiling area

32

Front with head cover

34

Window element, in particular sliding window

36

Handle of the window element 34

38

Guiding groove for window element 34

40

Suction opening in the rear area

42

Suction opening in the lateral area

50

Air deflection device or supply air profile

52

Base part of the air deflector or the Zuluftprofils 50th

54

Recess or bore or hole of the base part 52

56

Air inflow opening of the base part 52nd

58

Inlet slots of the air inflow opening 56

60

Deflection part of the air deflector or the Zuluftprofils 50th

70

fan

Z

Fresh air or supply air

Claims (15)

Trigger (100), in particular for a laboratory workstation or the like, with a chamber-shaped working space (14) limiting box-shaped housing, the a floor (20) acting as a work surface, a rear wall (26), two side walls (28), - a blanket (30), - A front side (32) which is associated with at least one openable to the work surface and closable window element (34), and - In the rear region of the housing and in the lateral region of the housing arranged suction openings (40; 42) for the extraction of exhaust air, wherein the front side (32) facing the region of the bottom (20) at least one air deflection device (50) for injection of supply air ( Z) is assigned to the working space (14),
characterized,
in that the air deflection device (50) has at least two air inlet openings (56) spaced apart from one another. Trigger according to claim 1, characterized in that the Luftumlenkeinrichtung (50) over at least a portion of the by the distance of the two side walls (28) defined to each other housing width. Trigger according to claim 2, characterized in that the Luftumlenkeinrichtung (50) extends substantially over the entire housing width. Trigger according to at least one of claims 1 to 3, characterized in that the Luftumlenkeinrichtung (50) extends substantially parallel to the front side (32) facing edge (22) of the work surface. Deduction according to at least one of claims 1 to 4, characterized in that the Luftumlenkeinrichtung (50) as a profile - With a non-bent base part (52) and - With a curved, the supply air (Z) deflecting deflecting part (60) is formed. Trigger according to claim 5, characterized in that the Air inlet openings (56) in the base part (52) are arranged. Trigger according to claim 5 or 6, characterized in that the air inflow openings (56) in the deflecting part (60) facing region of the base part (52) are arranged. Deduction according to at least one of claims 1 to 7, characterized - That the Lufteinströmöffnungen (56) are substantially uniformly spaced from each other and / or - That the side wall (28) nearest air inlet openings (56) are evenly spaced from this side wall (28). Trigger according to at least one of claims 1 to 8, characterized in that the air inflow opening (56) has a plurality of, in particular different lengths, inflow slots (58). Deduction according to at least one of claims 1 to 9, characterized in that the air inflow opening (56) is associated with at least one fan (70) for acting on the Luftumlenkeinrichtung (50) with air. Deduction according to at least one of claims 1 to 10, characterized in that the intensity of the supply of each air inlet (56) with supply air (Z) is selectively controllable and / or regulated. Method for reducing the concentration of pollutants present, in particular at a laboratory workstation or the like, by means of at least one trigger (100) according to at least one of Claims 1 to 11,
characterized,
that the supply air (Z) by at least two spaced-apart air inflow openings (56) is blown into the working space (14). A method according to claim 12, characterized in that the suction of the exhaust air in response to or in cooperation with the injection of the supply air (Z) is regulated and / or controlled. A method according to claim 12 or 13, characterized in that the intensity of the supply of each air inlet (56) with supply air (Z) selectively controllable and / or is controllable. Use of at least one trigger (100) according to at least one of claims 1 to 11 and / or a method according to any one of claims 12 to 14 for reducing the pollutant concentration at a laboratory workstation or the like.

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