EP2618931A1

EP2618931A1 - Extractor apparatus with gas cleaning

Info

Publication number: EP2618931A1
Application number: EP11782558.8A
Authority: EP
Inventors: Ulrich Gärtner
Original assignee: Waldner Laboreinrichtungen GmbH and Co; Waldner Laboreinrichtungen GmbH and Co KG
Current assignee: Waldner Laboreinrichtungen GmbH and Co; Waldner Laboreinrichtungen GmbH and Co KG
Priority date: 2010-11-13
Filing date: 2011-11-11
Publication date: 2013-07-31
Anticipated expiration: 2031-11-11
Also published as: HK1185033A1; AU2011328454B2; ZA201301755B; EP2618931B1; US20130183893A1; CN103189140A; BR112013011739A2; RU2013126884A; PL2618931T3; WO2012062478A1; DE112011103755A5; PT2618931T; CA2814909C; ES2746043T3; DE202011101114U1; CA2814909A1; AU2011328454A1; DK2618931T3; RU2583020C2; CN103189140B

Abstract

The invention relates to an extractor apparatus (10), in particular a laboratory extractor apparatus, having a working region (13) and having a fan arrangement (26) for generating an air flow (27) or an inlet opening for an air flow (27) for the purpose of transporting away gases and/or particles from the working region (13), and having at least one surface which delimits the working region (13). The extractor apparatus (10) has a charging means (30) for ionizing the air flow (27) and/or for electrostatically charging the at least one surface.

Description

EXTRACTION DEVICE WITH GAS CLEANING

The invention relates to a take-off device, in particular a fume hood device, with a working area and with a fan arrangement for generating an air flow or an inlet opening for an air flow for transporting away gases and / or particles from the work area and with at least one surface bounding the work area.

Such a take-off device, which is used for example for laboratories, is known for example from DE 201 06 395 Ul. The extraction device has a working chamber, which is closed on the front side by a door. For the discharge of, for example, gases from the working chamber or the working area a vent is provided, for which a fan assembly is required. In the processing and use of powdered, pure active ingredients, in their production, in fine dusts or even the handling of aerosols, however, there is the problem that a pure vent or the production of air flow may not be sufficient to a reliable removal of the gases and / or to ensure particles from the work area. This can lead to contamination of the environment of the trigger device, but above all to a danger to persons who use the trigger device, e.g. as a laboratory workstation.

CONFIRMATION COPY It is therefore the object of the present invention to provide an improved extraction device, in particular a fume hood device.

To achieve the object is provided in a trigger device of the type mentioned that it has charging means for ionizing the air flow and / or for electrostatic charging of the at least one surface.

A basic idea of the invention is to influence the electrical properties of the discharge device and / or the air flow with the aid of the charging means in such a way that, in particular, particles are conveyed away from the work area particularly well. This reduces the risk that a user of the trigger device suffers health damage. A particularly preferred field of use is the production, testing, research of pure active ingredients, in particular powdered active ingredients. Even toxic fine dusts can be optimally bound and carried away in the manner according to the invention. With regard to aerosols, the invention is particularly advantageous.

In the context of the invention, on the one hand to ionize the air flow, on the other hand electrostatically charge one or more surfaces, the combination of both measures is particularly advantageous. It is understood that not only electrostatically chargeable surfaces may be present, but also electrostatically non-chargeable surfaces. Furthermore, it is possible to provide only an ionization of the air flow in a discharge device according to the invention, while an influence of the surfaces by electrostatic measures does not take place. This means that a per se electrostatically neutral or at least not defined electrostatically charged trigger device with Help the ionized air flow according to the invention can be optimally vented.

The electrostatically chargeable surface comprises, for example, a side wall surface, a bottom surface provided for depositing objects, or also an inner surface or outer surface of a support element.

At the at least one surface, which is electrostatically chargeable, a zoning is preferably provided. That is, the surface has two electrically isolated from each other, rechargeable by the charging means with different electrical polarity zones. It is also possible to provide further, electrically isolated and separately electrostatically chargeable zones.

For electrostatic chargeability of the surfaces can be provided, for example, that they are made of metal or provided with an electrically conductive layer.

The at least one zone comprises, for example, a working zone and a marginal zone which laterally delimits the working zone, in particular annularly or partially annularly. For example, the working zone is located in the center of the working area and is surrounded by the peripheral zone in a ring shape. The working zone and the edge zone are electrostatically chargeable, but with different electrical polarity.

Also preferred is a steering or influencing the air flow: The trigger device has expediently

Air guide means for directing the air flow or a portion of the air flow along the at least one surface. For example, this surface is a page wall surface or a bottom surface, in particular the working surface of the work area.

In particular in this context it is advantageous if the charging means ionize the air flow, for example electrically charging, electrically discharging or, more preferably neutralizing, this electrically conditioned air flow along at least one surface, for example the bottom surface and / or a side wall surface of the working region, in particular a working chamber, is guided along or flows along to electrically condition this respective surface, for example, to neutralize. The neutralization is carried out in particular by a mean time neutral ionization, e.g. alternating with + 6kV and - 6 kV.

For this purpose, air-deflecting means or air-guiding means are expediently provided, for example steering surfaces and / or aligned air outlets from which the electrically conditioned airflow exits and flows along the respective surface.

An ionized, in particular electrically neutral, air stream flowing along the surface also has the advantage that it not only electrically adjusts the surface, so that no particles or at least only a few particles adhere there, but at the same time the respective particles are conveyed away from the surface ,

It should be noted at this point that the design and the material of the wall surface no special requirements, even if, for. an electrically conductive

Surface is preferred. It suffices if the ionized, in particular electrically neutral, medium air flow flows along the surface, for example on an artificial surface. fabric surface or the like in order to adjust these electrically ideal. In any case, particles do not adhere or adhere to the surface, which is not electrically or specifically charged or neutralized, or only to an insignificant extent.

It is also not necessary that the wall surface is connected to an electrical potential, for example neutralized. Thus, for example, an electrically nonconductive material, for example a plastic surface, can be neutralized or charged to a predetermined potential or discharged by the air flow. Of course, it would also be possible to electrically condition the surface not only by means of the ionized, for example neutralized, air stream, but also by an additionally applied electrical potential.

It is sufficient if parts of the air stream are ionized or are electrically neutralized by ionization. It is also possible that different air streams flow through the working chamber or work area or flow along the respective wall surfaces, e.g. at least one first air stream is ionized while at least one other, second air stream is not ionized.

Furthermore, it is particularly useful in this context if such an air stream, which touches on a wall surface or surface ionized in the meaning of the invention is neutralized, for example, while at least one other air flow, for example, flows through the center of the work area or a working space , remains electrically untreated. This central air flow is in fact also able to convey particles from the interior of the work area or working space away. The work area is conveniently limited by one or more walls.

Preferably, the withdrawal device has a working chamber which encompasses or limits the working area.

The working chamber is expediently accessible through an access opening, to the closure or security of which several, individually or in combination, sensible measures are possible. For example, the working chamber can be closed by a door, which can also be referred to as a "window". This door is e.g. around a hinged door, but expediently to a sliding door. Also a multipart door, a folding door or the like, is possible. Of course, several doors may be provided to close the access opening.

Furthermore, it is expedient to provide at the access opening an air curtain or more air curtains that protect the operator. Furthermore, air-guiding measures can advantageously be provided on the door such that when the door is opened an additional airflow occurring in the direction of the interior of the working chamber occurs. Thus, particles or gases will be removed from the access port, i. away from an operator, so that it is protected.

It is preferred that the work area can be vented via one or more vents. At the respective vent opening, a filter is expediently provided with which particles, gas components or the like can be filtered out. The air flow can flow away from the working area or away from the working area in the direction of the vent opening and be led away from it through the extraction device. The extraction device preferably has an exhaust air duct. conclusion, which can be connected, for example, to an exhaust duct system.

While it is possible for the on-site ionization device, i. for example, directly to an airflow outlet, which opens into the work area, in particular the working chamber, to arrange. Thus, therefore, the air or air flow on-site, i. ionized immediately before leaving the work area. However, it is preferred to arrange the ionization device or the charging means, which comprise an ionization device, at an airflow outlet of the fan arrangement. Thus, the air blown out by the fan is ionized before it is fed into a distribution system or into a duct arrangement. Thus, a central ionization is provided, which is inexpensive. The charging means, in particular the ionization device, is expediently designed to ionize the air flow with different polarity.

For example, the ionization device changes the polarity at intervals. Thus, e.g. Particle accumulations on a surface, e.g. the work area, a side wall or the like, be prevented or removed.

It is particularly preferred that the ionization takes place in such a way that the electrical charge in the local means and / or time means is "zero", ie that the charging means charge or apply surfaces of the triggering device locally and / or temporally with alternating polarity, so that they are electrically neutral in local means and / or temporal mean. This measure is of course also useful in ionizing or charging the air flow or parts of the air flow, ie that the air flow or air flow components are electrically neutral in time average, for example, parts of the air flow from the charging means be charged or ionized with alternating electrical polarity and / or be charged by the charging means locally adjacent to each other with different polarity or ionized. It is possible, for example, that locally next to each other electrically positively charged and electrically negatively charged air streams mix with each other, so that a total of an electrically neutral air flow is formed.

Of course, an ionized and a non-ionized air stream and / or ionized with different polarity air streams can mix with each other, for example, if the trigger has corresponding juxtaposed outflow, from which the different air streams flow and thus can mix with each other.

Of course, in an advantageous embodiment of the invention, the extraction device can be used with both ionized air and ionized air, i. Conventionally, operated. For example, the ionization device is only turned off or on.

For distributing the air flow and / or for receiving the air flow from the working area a channel arrangement is expediently provided. It is understood that both for distributing the airflow to the work area and for receiving the airflow from the work area, i. for venting, separate channel arrangements can be provided.

Preferably, the channel arrangement comprises Luftleitprofile and / or support elements, such as support profiles, a surrounding the work area housing or a door for closing the work area (or both). The air guide profiles and / or Support elements include air ducts and / or air outlet for the air flow. For example, the air guide profiles or support elements are guide profiles or corner profiles or edge profiles of a door or a side wall. Thus, it is possible, for example, to generate an air jet in the region of a door, for example at its lower edge.

The air guide profiles are expediently arranged so that they guide or omit the air flow, in particular the ionized or neutralized air flow, so that it flows along the at least one surface, for example the floor of the work area and / or a side wall.

Of course, a plurality of channels are expediently provided in the region of an access opening, which generate an air flow into the interior of the extraction device.

The Luftleitprofile and / or support members are connected, for example, electrically conductive with each other. Thus, an electrostatic charge can be forwarded from one air guide and / or support element to the other support element and / or Luftleitprofil. Furthermore, it is expedient that the support elements and / or Luftleitprofile are interconnected so that their Luftleitkanäle communicate with each other, i. that air can flow from one air guide or support element into the other air guide or support element via the connection point. Preferred are connectors.

Furthermore, it is expedient if two or more air flow outlets are present, wherein an air flow outlet is flowed through with non-ionized air, while another air flow outlet can be flowed through with ionized air.

Of course, different airflow outlets can also be supplied by different electrically charged or ionic flowed through sated air. So it is conceivable, for example, that with one and the same fan arrangement, an air flow is generated, but this is divided into a first and a second air flow, wherein the first air flow is ionized by the ionization device or the charging means, while the other air flow remains unionized. It is also possible that a plurality of fans are provided, wherein each fan generates a different air flow, for example, air streams, one of which positive airflow, another airflow is negatively ionized or ionized.

Preference is given to a modular concept, that is to say that the extraction device, for example its housing, air guide element (s), air guide profile (s) or the like, has a module receiver, e.g. a plug-in receptacle or a shaft, into which a charging module with charging means for ionizing the air flow or an air flow and / or for ionizing a wall surface, can be inserted. In this way, for example, an existing, conventional per se, but at least one Modulaufnähme having extractor device with a charging module for ionization, for example, neutralization, an air flow and / or a wall surface to be retrofitted. Preferably, the module receptacle is arranged on an air outlet of the housing.

The charging module has expediently an air inlet for the not yet ionized air flow. The charging module may also have a fan for generating the airstream on board. Preferably, an air outlet for the ionized, eg neutralized, air flow is provided on the charging module. The charging module may also have electrical contacts for electrical connection to at least one wall and / or one surface. The charging means expediently comprise at least one ionizing body for ionizing the air flow. Conveniently, a plurality of ionizing bodies are present. It is advantageous if a plurality of ionization bodies are connected to a common electrical conductor for charging with the same electrical polarity. On the other hand, it is also advantageous if at least two ionization bodies which are electrically insulated from one another are present, so that a first air stream component can be positively ionized, for example, a second air stream component can be negatively ionized, for example.

A respective ionizing body is expediently arranged on an air duct, for example the aforementioned duct arrangement of an air guide profile, a door or the like. It is preferred that one or more ionization bodies are arranged, for example, on an airflow passage of an air guide profile or channel or also on an airflow outlet of an air guide profile or channel.

It is preferred that the at least one ionization body forms or comprises an air-deflecting surface for the air stream. For example, the direction of the

Air flow changed by a predetermined angle, i. the air flow changed, for example, in its flow direction.

However, the at least one ionizing body can also form or comprise a throttle, for example. Furthermore, it is possible that the at least one ionization body is formed by a discharge nozzle or comprises a discharge nozzle.

The at least one ionization body expediently comprises at least one grid. For example, such a grid is arranged at an outflow opening of the air guide or an air guide profile of the trigger. There could be Of course, for example, only an arrangement of individual wires, in particular transversely to the flow direction extending wires, be arranged.

A preferred embodiment comprises, for example, that the ionization body comprises an air guide surface. Another variant provides that the ionization body comprises a needle tip or a needle tip profile.

Conveniently, the at least one ionization body is corrugated transversely to the flow direction of the air flow. A waveform may include a uniform, for example, sinusoidal waveform. However, it is also possible, for example, a jagged configuration, i. E. that the troughs are pointed.

It has proved to be advantageous if the at least one ionization body in the outflow direction of the air stream, i. downstream, is rejuvenating. Preferably, the ionization body is pointed downstream or is designed in the manner of a needle.

As already mentioned, it is advantageous that a plurality of ionization bodies are present. It is preferred that at least 2, preferably further, ionizing bodies are arranged side by side in a series arrangement. The series arrangement runs, for example, transversely to the flow direction of the air flow, which is to be ionized by the ionizing bodies.

It is possible that the ionization bodies have the same polarity, ie that they charge the air flow with the same electrical polarity. Preferably, however, insulated from each other, in a row device next to each other ange- ordered ionizing body, ie at least two arranged in series next to each other, electrically isolated from each other ionization body. Thus, it is possible, for example, for the two ionization bodies (or further ionization bodies) to ionize the respective air flows flowing through them differently, for example to charge them differently and / or to ionize them with different polarity.

Furthermore, it is possible that, for example, with opposite or different electrical polarity charged ionization bodies are arranged alternately adjacent to each other, so that, for example, an electrically positively charged ionizing body between two electrically negatively charged ionizing bodies is arranged.

Of course, the polarity and / or the voltage level of the respective ionization body can be changed over time.

Furthermore, it is expedient if the trigger device has a control for setting an operating mode, for example the fan arrangement and / or the charging means. The controller controls the operating mode, for example, in time.

It is possible that the controller switches between a cleaning mode and a working mode. In the cleaning mode, for example, working with an increased volume of air flow, so that an optimal removal of gases and particles from the work area is possible. It is possible, for example, for the working area in the cleaning mode to flow more strongly through the air flow than in the working mode. Namely, in the working mode it may be that the operator, for example, inadvertently acts to deflect the air flow in the direction of himself, that is, towards his body, so that he is virtually himself with Particles contaminated. Thus, it is useful to work in working mode with less air flow than in the cleaning mode.

It is also possible that in the working mode, one or more surfaces of the discharge device are electrostatically charged in a sense that particles are attracted to the surfaces. It is preferred in this case if the fan arrangement does not work or operates at a lower level in the working mode, which facilitates adhesion of particles to the electrostatically charged surface. Then, in particular with the access door closed, switched to the cleaning mode, wherein, for example, the electrostatic charge of the

Surface (s) with the same polarity as the ionization of the air flow takes place, so that the particles are repelled and entrained by the air flow, for example in the direction of the vent opening.

From the above example, it is clear that the interrogation of one or more sensors of the trigger device by the controller is appropriate. For example, when a sensor detects a position of a door at the access opening of the work device, the controller may adjust the operating mode of the fan assembly and / or the loading means depending on the position of the door (open or closed, partially open, or the like).

Hereinafter, embodiments of the invention will be explained with reference to the drawing. Show it:

Figure 1 is a perspective oblique view of a trigger device according to the invention, in

Figure 2 is shown in section (section line A-A in FIG

1) , a schematic representation of a first embodiment of a working area of the trigger device according to Figures 1, 2, a schematic representation of a second embodiment of a working area of the trigger device according to figures 1, 2, an ionization device for a Luftleitprofil in an oblique perspective view, the ionization of Figure 7 frontally from the front, the ionization of Figures 7, 8 mounted on an air guide, which corresponds approximately to the Luftleitprofil according to Figure 3, from the side, and

FIG. 10 shows a further ionization device connected to the

Air guide is mounted according to Figure 9, wherein only a section is shown, which corresponds approximately to a section B in Figure 9.

A take-off device 10 is designed as a so-called fume hood, in short as a fume hood. Although it is in the drawing device shown in the drawing 10 is a stationary to be used deduction device, but For example, by attaching rollers on the bottom could also be used as a mobile trigger device. The extraction device 10 comprises a housing 11, in the interior of which a working chamber 12 is arranged. The working chamber 12 defines a working area 13 which is available to an operator, for example, for the research, processing or production of pure active ingredients, powdered active substances, fine dusts, in particular toxic fine dusts or even generally aerosols. The working chamber 12 is bounded laterally by side walls 14, below by a bottom wall 15, above by a top wall 16 and rear by a rear wall 17th

A substructure or base 18 on which, as explained, rollers could be arranged, for example, forms an underside of the extraction device 10. The base 18 can be, for example, a solid base or can also have receiving spaces, in particular receptacles, drawers or the like which can be closed by flaps.

The working chamber 12 is accessible at the front through an access opening 19, so that an operator can intervene, for example, with his arms or hands in the working chamber 12. In this way, he can park, for example, on an upper side of the bottom wall 15, thus a bottom surface 20, objects, such as vessels in which powdered active substances are added or the like. Further, 17 brackets 21 are arranged on the rear wall, where objects can be attached. The brackets 21 are designed for example in the form of tripods, projecting hooks or the like, this does not matter here. The brackets 21 penetrate one of the rear wall 17 upstream, the rear wall 17 is substantially veneering glare wall 22. Between the glare wall 22 and the rear wall 17, a gap 23 is provided, which is used for venting the working chamber 12. The brackets 21 So stand forward in the direction of the working chamber 12 from the rear wall 17 and penetrate the curtain wall 22, in front of which they also protrude. At the same time serve the brackets 21 as supports or brackets for the curtain wall 22nd

The access opening 19 can be closed by means of a door 24. Of course you could call the door 24 as a window. In any case, the door 24 is a closure means for closing the access opening 19. The door 24 is configured as a sliding door and can be adjusted between an upper, the access opening 19 substantially releasing open position 0 and a lower closed position S, in which the door 24, the access opening 19 closes, at least substantially airtight.

The door 24 has a plate-like shape. The door 24 is attached to lateral guides 25 between the open position O and the closed position S, i. an upper and a lower position, adjustable. In this context, it should be emphasized that, of course, a trigger device according to the invention can also have a folding door, a segmented sliding door or the like other doors or windows. Furthermore, several doors are readily possible. Nevertheless, the operator is also effectively protected from deleterious action by inside the trigger 10, i. in the working chamber 12, befindlicher, especially powdery substances, such as pharmaceutical substances, toxic particulate matter or the like, protected, even if the door 24 assumes its open position 0 or at least a partially open position:

By means of a fan arrangement 26, which is accommodated, for example, in the base 18, it is possible to generate an air flow 27 for transporting away gases and / or particles from the working area 13. Instead of or in support of the fan assembly 26, an external fan assembly could also be provided which provides, for example, an airflow entering via an inlet port 63.

The fan assembly 26 is indicated only schematically. For example, the air stream 27 flows out of an airflow outlet 28 from the fan assembly 26. At the

Air flow outlet 28 is an ionization device 29 is arranged, with which the air flow 27 is electrically rechargeable, that is ionizable. The ionization device 29 forms a component of charging means 30, which serve for the electrostatic charging of the air flow 27.

The air flow 27 is distributed in the extraction device 10, for which purpose a channel arrangement 31 is provided. The channel arrangement 31 comprises, for example, air guide profiles 32, 33, in whose interior air guide channels 34 are provided. The air ducts 34 are fluidically, e.g. connected via a line 62, with an outlet of the ionization device 29, from which the ionized air stream 27 flows out, so that ionized with the ionization device 29 turned on, but otherwise

Unionized air flow 27, the Luftleitprofile 32, 33 flows through.

Air flow outlets 35 are expediently provided along the air ducts 34, so that the air stream 27 can flow out through the airflow outlets 35 and can flow into the working chamber 12. Of course, it is advantageous if outlets for the air flow 27 are also present at other points, such as air flow outlets 36 on the outer peripheral region of the bottom wall 15 and the bottom surface 20th The air guide profiles 32 are arranged laterally adjacent to the access opening 19 on the side walls 14. The Luftleitprofile 32 at the same time provide the guides 25, ie they have for example a guide groove into which a guide projection 37 of the door 24 respectively engages. The guides 25 are for example

Longitudinal grooves. The air guide profile 33 extends at the bottom in the transverse direction at the access opening 19. The air guide profiles 32, 33 are connected to one another in such a way, e.g.

inserted into one another or stumped together that their air ducts 34 are fluidly connected in the interior, so that they can be traversed by the air flow 27.

The Luftleitprofile 32, 33 act in the form of spoilers and have air guide surfaces 38 which extend curved. When the air guide profiles 32, 33 are mounted on the extraction device 10, their air guide surfaces 38 act in the manner of funnels. On the side facing the working chamber 12, the air guide surfaces 38 pass into a step 39, above which, in turn, the air flow outlets 35 are provided. The steps 39 thus have a wall 39a facing the interior or working chamber 12, on which the air flow outlets 35 are arranged so that air flowing out of the air flow 27 flows in the direction of the working chamber 12. This has an advantageous effect, in particular when the door 24 is open. In this case, a pulling action occurs that also outside air in the direction of the working chamber 12 from the air flowing out of the Luftstromauslässen 35 toward the interior of the discharge device 10, i. the working chamber 12 is entrained.

There is provided for optimum ventilation: exhaust air can namely, for example, flow through discharge openings 40 on the wall 22 in the direction of the gap 23 which in this respect an outflow 41, albeit with a large areal extent or flat shape forms. The air flow 27, if necessary through the access opening 19 into the working chamber 12 incoming ambient air, thus enters through the discharge openings 40 in the outflow 41 and forms there an exhaust air flow 42nd

The exhaust air flow 42 flows in the intermediate space 23 upwards in the direction of a vent opening 43. This is provided on the top wall 16. Below the vent opening 43, the intermediate space 23 is widened in that the cover wall 22 has an obliquely forwardly extending section in the direction of the access opening 19.

At the vent 43, for example, a filter 44 may be provided, with which the exhaust air stream 42 can be filtered.

On the top wall 16, a pipe 45 is further arranged, which is fluidly connected to the vent opening 43, so that the exhaust air flowing through the vent opening 43 through the pipe 45, thus an exhaust duct 46 therethrough, can flow away from the take-off device 10. For example, the pipe 45 is provided for connection to a ventilation system or an exhaust duct, to which further, not shown in the drawing trigger devices can be connected. To the vent opening 43 is still nachzutragen that it is in a rear region of the working chamber 12, close to the top wall 16.

Of course, further, not shown in the drawing vents or communicating with the vent port 43 outflow, from which exhaust air from the working chamber 12 can flow out in the direction of the vent opening 43 may be provided.

Now the arrangement can be made such that the ionization device 29 permanently ionizes the air flow 27, for example, permanently electrically positive or electrically negative, which is indicated by air particles 47 denoted by "plus" in Figure 2. Negatively charged particles 48

(also shown schematically), e.g. a powder, so is attracted by the air flow 27, which is electrically positively charged, and taken away, so that the particles 48 are optimally removed from the working area 13. The risk to the user is thereby low. The air particles 47 are shown separated from the particles 48 in Figure 2, but may or may be mixed in practice.

It is also possible that the airflow 27 is electrically negatively and positively charged, e.g. by a spatially and / or temporally alternating ionization, so that it is electrically neutral on average. This can also be the case for the particles, so that they are electrically neutral and do not adhere to the inner walls of the working chamber 12 and are taken along by the air flow 27.

This effect can be further increased by the fact that, for example, a working zone 49 and an edge zone 50 of the working area 13 surrounding the working zone 49 are charged electrostatically, advantageously with different polarity, by the loading means 30. The working zone 49 and the edge zone 50 (FIG. 5) are, for example, electrically insulated regions of the bottom surface 20, which can be electrically charged differently. If, for example, the air particles 47, ie the air flow 27, are positively charged, the edge zone 50 is expediently also charged electrically positively, so that no particles 48 that are positively charged electrically in this case can adhere there. The positive electrical charging of the particles 48, for example of the powder, takes place in the central region of the working region 13, ie in the working zone 49, which is preferably also electrically positively charged. If the Particles 48, for example, are received in containers that are electrically conductive and are electrically in contact with the working zone 49, thereby also the particles 48 are positively charged in each case parked there container.

It is understood that other zonings of a respective electrostatically chargeable surface of a trigger device according to the invention are also possible, e.g. the matrix-like zoning of the surface 53 according to FIG. 6. For example, there are negative zones 51 and positive zones 52 arranged in the manner of a chessboard. It is understood that, for example, a strip-shaped arrangement, an arrangement with in particular concentric, annular zones of different electrical polarity or the like is readily possible.

A preferred embodiment provides that the surface 53 is expediently electrically neutral in the spatial mean and / or in the time average. For example, the charge of positive zones 52 and negative zones 51 equalize such that the charge is zero in the spatial average. However, this is not absolutely necessary, but only an option.

Furthermore, it is possible that the charging means 30 also electrostatically charge other surfaces of the discharge device 10, in order to allow optimal removal of particles or other substances from the working chamber 12. Thus, for example, it is possible that air guide sections 32, 33 as a whole, but in particular the air guide channels 34, electrically conductive, i.

are electrostatically chargeable. For example, the Luftleitprofile 32, 33 are made of metal, in particular aluminum. But it is also possible, the Luftleitprofile 32, 33 - and of course other surfaces that limit the working chamber 12, such as the working chamber 12th facing side wall surfaces 54 of the side walls 14 to charge electrostatically in the context of the invention.

Of course, the curtain wall 22 and / or the rear wall 17 could be electrostatically charged by the charging means 30. It is also conceivable that, for example, the brackets 21 are electrically insulated from the diaphragm wall 22 and / or the rear wall 17, so that the brackets 21 and the wall surfaces of the rear wall 17 and the diaphragm wall 22 may have a different electrical polarity. At least for example, it is possible to provide receptacles fixed to the holders 21, in which, for example, powder is located, with a different electrical polarity than the walls delimiting the intermediate space 23, namely the rear side of the facing wall 22 facing the latter and the front side of the rear wall 17. But it is also possible that an electrical connection between on the one hand the brackets 21 and on the other hand the space 23 delimiting surfaces is present.

It can be provided that the fan arrangement 26 generates a substantially constant air flow 27. However, it is expedient if a controller 55 is present, for example a microprocessor control which, depending on boundary conditions, eg temporal conditions and / or sensor signals, controls the fan arrangement 26 and / or the charging means 30, in particular the ionization unit 29. For example, a sensor 56 is provided, which is actuated by the door 24 when it assumes its closed position S. The sensor 56 then generates a sensor signal that is received by the controller 55 and signals that the access port 19 is closed. Then, for example, the fan assembly 26 is reduced in terms of its delivery rate, so that it generates a weaker airflow 27. In this case threatens there is no danger that particles 48 can escape outwardly through the access opening 19 and damage the operator possibly standing there.

However, if the door 24 is up, i. is adjusted to the open position O, so that it is as shown in Figure 2 in the area of the upper, the access opening 19 top closing aperture 57, the sensor 56 reports "open position O" to the controller 55. This increases the flow rate of the

Fan assembly 26, so that an increased air flow 27 is blown out of particular the air flow outlets 35, so that in any case no particles 48 can get out of the working chamber 12 out, but in the direction of

Outlet openings 40 are blown.

Furthermore, it is possible for the controller 55 to switch the ionization device 29 on and off alternately or also to control the ionization of the air flow 27 with different polarity, in particular in a temporal change.

The outflow openings 40 are presently arranged in the lower region of the diaphragm 22. In the present case, the outflow openings 40 are slot-shaped. It is understood that other geometries and / or arrangements of outflow openings are also possible. Furthermore, it is possible that, for example, side walls are provided with outflow openings.

It is understood that further measures may be taken to increase safety. For example, an air curtain device 58 may be provided which generates an air curtain 59. The air curtain 59 "closes" the access opening 19. For example, the air curtain 59 flows from above in the direction of the bottom surface 20, from which it is deflected in the direction of the outflow openings 90. Device 58 may have an ionization device or be in fluid communication with an ionization device.

The air guide surface 38 and / or the step 39 form air guide means 60 for directing and guiding the air flow 27.

At the door 24 and / or on one or more wall sides of the trigger 10 are preferably provided with transparent material, in particular glass, closed window openings, through which one can look into the working chamber 12 from the outside.

Of course, it is not necessary that the entire air stream 27 is ionized. For example, a branch 61 can be provided in the area of the airflow outlet 28, with which a part 27 'of the airflow 27 can be branched off before the ionization by the ionization device 29. The branch 61 is, for example, fluidically connected to the air flow outlets 36 at the edge of the bottom surface 20.

In the following, possibilities for an optimized ionization of an air flow, for example the air flow 27, will be explained in connection with FIGS. 7-10:

An ionizer 70 includes, for example, a carrier 71 having an elongated shape. The carrier 71, for example, frontal on the air guide 33 can be arranged.

The ionization device 70 is arranged, for example, in the stage 39. Preferably, ionization device 70 is glued to the air guide profile 33, welded thereto, screwed or the like. It is possible that one electrically conductive or an electrically insulating connection between the ionization device 70 and the air guide 33 is provided. However, an ionization device according to the invention can also form an integral part of a Luftleitprofils.

The carrier 71 includes, for example, a U-shaped profile 72 which defines an interior 73. The interior space 73 extends between side walls 74 and a bottom wall 75 of the profile 72. The side walls 74 form side legs of the profile 72.

The side walls 74 serve as support walls for a wall 76. The wall 76 is presently a closed wall or continuous wall and closes the interior 73 at its top. The wall 76 is opposite the bottom wall 75.

On the wall 76 supports 77 are arranged, on which a further wall 76 spaced from the wall 78 is supported. Between the walls 76 and 78, a distance 79 is present.

The supports 77 are for example block-like or block-like.

The wall 76, the supports 77 and the upper wall 78 are advantageously electrically insulating. For example, they consist of

Plastic or are provided with a plastic coating. Thus, therefore, limit the walls 76, 78 and the supports 77 from each other electrically insulated chambers.

Ionizing bodies 80 are arranged in these chambers. The ionization bodies 80 have a plurality of walls zigzag-shaped or wavy in cross-section 81. The walls 81 are, for example, roof-like inclined to one another. For example, an angle between 2 adjacent walls 81 about 90 °, with smaller or larger angles are readily possible.

Of the respective outer wall 81 is a mounting portion 82 from the side, which serves to attach the Ionisierungskörpers 80 to a substrate.

The walls 81 are tapered at their front, where a respective air stream flows from the ionizing bodies 80. By way of example, the walls 81 have tips 83 on their front side. This advantageously achieves a good demolition of outflowing air and, in addition, optimum ionization.

The mounting portions 82 are penetrated by fastening bolts 84, which also penetrate into the wall 76, these penetrate even here. Free ends of the fastening bolts 84 are in fact electrically conductively connected to electrical conductors 85, 86, so that an electrical connection between one of the ionizing bodies 80 and one of the two conductors 85 or 86 is established. As a result, the ionization bodies 80 can be charged with the potential of the conductors 85 or 86.

The arrangement is advantageously such that alternately one ionization body 80 is electrically connected to one conductor 85, one in the row direction R adjacent ionization body 80 to the other conductor 86.

The conductors 85, 86 are arranged in the interior 73 and electrically connected to, for example, a first and a second charging means 87, 88. This electrical connection can be a permanent connection, so that, for example, the charging means 87, 88, the conductors 85,

86 each apply to the applied output potential.

For example, it is possible for the loading means 87 to be the conductor

85 and the connected thereto Ionisierungskörper permanently with a positive potential, the charging means 88, the conductor 86 and the connected thereto ionization body 80 permanently with a negative potential or vice versa.

But it is also possible that between the charging means 87, 88, a switching means, such as a changeover switch is arranged, so that alternately the conductor 85 with the charging means

87 or the charging means 88 is connected, mutatis mutandis, the conductor 86 is alternately connected to the charging means with the charging means 88 or with the charging means 87. In the present case, the arrangement is such that a switching means 89 switches the charging means 87, 88 with regard to their polarity or actuates to switch the polarity, so that the charging means 87, 88, the conductors 85,

86 alternately provided with positive or negative electrical potential.

FIG. 10 shows an ionization device 90. If components of the ionization device 90 correspond to those of the ionization device 70, they are not explained in more detail and provided with the same reference numerals.

In contrast to the ionization device 70, however, individual ionization bodies 91 protrude from the conductors 85, 86 and protrude into the distance 79. In this case, the arrangement is expediently such that alternately in a row direction R, in which the ionization device in 70, 90 extend, in each case one with the conductor 85 and an ionizing body 91 connected to the conductor 86 is arranged. Thus, the air flow flows 27 with respect to the row direction R once past an ionization body 91 having a first potential and once having a second potential.

The ionization bodies 91 have a support portion 92 which is connected to one of the conductors 85 or 86.

From a respective support portion 92 is a mandrel 93 from. A tip 94 of the dome 93 is oriented in the outflow direction of the air flow 27.

The air flow 27 thus flows out through the air flow outlets 35 and then past one of the ionization bodies 80 or 91, being electrically charged, ie ionized.

Advantageously, the arrangement is made such that the air flow 27 is electrically neutral in spatial and / or temporal mean, when it flows out of the ionization device 70 or 90.

The ionizing body 80, 91 consist for example of sheet metal, in particular electrode sheet. In any case, the ionizing bodies 80, 91 are electrically conductive.

The ionizing bodies 80, 91 do not project in front of the walls 76 and / or 78, so that they protect the ionizing bodies 80, 91 in a protective manner.

It is understood that for the ionization of an air flow, for example, a grid may be provided. For example, in FIG. 3, an electrically rechargeable grid 100 is arranged on an airflow outlet 35. The ionization devices 70 and / or 90 are expediently designed as loading modules 95 or 96, which can be subsequently mounted on a suitably prepared extraction device. By way of example, a module receptacle 97, for example a module shaft, which is schematically illustrated in FIG. 2, is provided on the withdrawal device 10, into which the loading modules 95 or 96 can be inserted. The module shaft 97 is expediently provided in the region of an air outlet for the air flow 27, for example at the air flow outlets 35 or upstream, but can also be provided, for example, in the interior of the housing 11.

It is also possible that the load modules 95 or 96 the

Air flow outlets 35 form or include. Furthermore, it is expedient if a module receptacle is arranged upstream of an airflow outlet. For example, a module receptacle 98 may be provided in front of the airflow outlets 35 (Figure 9), e.g. by a section 99 of the Luftleitprofils 33 is designed accordingly.

Furthermore, even at the lower and / or lateral air outlets, e.g. on or in the air guide profile 33 and / or 32, an ionization device may be provided, e.g. a loading module 101 (FIGS. 3, 4). There is advantageously a module housing, e.g. a plug-in receptacle or a slot provided for the charging or ionizing module.

Claims

claims

1. Deduction device, in particular laboratory fume hood device, with a working area (13) and with a fan arrangement (26) for generating an air stream (27) or an inlet opening (63) for an air flow (27) for transporting away gases and / or particles (48) from the working area (13) and with at least one surface bounding the working area (13), characterized in that it has charging means (30; 87, 88) for ionizing the air flow (27) and / or for electrostatically charging the at least one surface.

2. Deduction device according to claim 1, characterized in that the at least one working area (13) delimiting, electrostatically chargeable surface, at least one page wall surface (54) and / or provided for parking objects floor surface (20) and / or a Inner surface or outer surface of a support member or a Luftleitprofils comprises.

3. Deduction device according to claim 1 or 2, characterized in that on the at least one surface at least two electrically isolated from each other, by the charging means (30; 87, 88) are provided with different electrical polarity rechargeable zones.

4. extraction device according to claim 3, characterized in that the at least one zone at least one working zone (49) and at least one of the working zone (49) in particular partially annular or annular surrounding edge zone (50).

5. Deduction device according to one of the preceding claims, characterized in that it comprises air guide means (60) for directing the air flow (27) or a part of the air flow (27) along the at least one surface.

6. Deduction device according to one of the preceding claims, characterized in that the working area (13) is at least partially bounded by walls and / or inside a working chamber (12) and / or a housing (11) of the trigger device (10) is provided and / or has a work surface.

7. Deduction device according to claim 6, characterized in that the working chamber (12) through an access opening (19) is accessible, wherein the access opening (19) advantageously by means of a door (24) is closable and / or expediently at the access opening (19 ) an air curtain device (58) for generating an air curtain (59) is provided.

8. extraction device according to one of the preceding claims, characterized in that the working area (13) via at least one vent opening (43) is vented.

9. Deduction device according to one of the preceding claims, characterized in that the loading means (30; 87, 88) one in particular at an air flow outlet (28) of the

Fan arrangement (26) arranged ionization device (29).

10. Deduction device according to one of the preceding claims, characterized in that the charging means (30; 87, 88) for ionizing the air flow (27) and / or the at least one surface in the sense of neutralization of the air flow (27) and / or at least a surface are designed.

11. Deduction device according to one of the preceding claims, characterized in that it comprises air guiding means (60) for directing the particular electrically neutral ionized air flow (27) in the direction of at least one working area limiting surface for electrostatic charging or discharging, in particular neutralizing, the at least one surface having .

12. Deduction device according to one of the preceding claims, characterized in that the charging means (30; 87, 88), in particular the ionization device (29), for the ionization of the air flow (27), in particular temporally alternating, are designed with different polarity.

13. Deduction device according to one of the preceding claims, characterized in that it comprises switching means (89) for applying an alternating polarized electrical voltage to a surface or to an ionizing body (80; 91) for ionizing the air flow (27) and / or a surface of the Workspace has.

14. Deduction device according to one of the preceding claims, characterized in that the electrical charge of the ionized by the alternating polarized electrical voltage air flow (27) or electrically charged surface in temporal and / or local means is approximately zero.

15. Deduction device according to one of the preceding claims, characterized in that it comprises a channel arrangement (31) for distributing the air flow (27) in the working area (13) and / or for receiving the air flow (27) from the working area (13).

16. Deduction device according to claim 15, characterized in that the channel arrangement (31) Luftleitprofile (32, 33) and / or support elements of the work area (13) surrounding the housing (11) and / or a door (24) for closing the work area ( 13), wherein the Luftleitprofile (32, 33) or the support elements Luftleitkanäle (34) and / or air flow outlets (35) for the air flow (27).

17. Deduction device according to claim 16, characterized in that the Luftleitprofile (32, 33) or the support members are electrically conductively connected to each other and / or connected to each other, that Luftleitkanäle (34) in the interior of the connected Luftleitprofile (32, 33) or Support members communicate with each other or are fluidly connected.

18. Deduction device according to one of the preceding claims, characterized in that the charging means (30; 87, 88) have at least one ionization body (80; 91) for ionizing the air flow (27).

19. Deduction device according to claim 18, characterized in that the at least one ionization body (80, 91) is arranged on an air duct or an airflow outlet (35) of an air guide profile (32, 33) and / or the at least one ionization body (80; 91) as an air-deflecting surface and / or at least one throttle and / or at least one exhaust nozzle for the air flow (27) forms or ümfasst.

20. Deduction device according to one of claims 18 or 19, characterized in that the at least one ionization body (80; 91) at least one grid (100) and / or at least one air baffle and / or at least one needle tip profile and / or at least one transverse to the flow - Direction of the air stream (27) extending wire comprises.

21. Deduction device according to one of claims 18 to 20, characterized in that the at least one ionization body (80; 91) is wavy or zigzag-shaped transversely to a flow direction of the air flow (27) and / or that the at least one ionization body ( 80, 91) in a discharge direction of the air flow (27) is tapered, in particular pointed or in the manner of a needle configured.

22. Deduction device according to one of claims 18 to 21, characterized in that at least two ionization bodies (80; 91) are arranged side by side in a row arrangement.

23. Deduction device according to claim 22, characterized in that the at least two ionization bodies (80; 91) are electrically isolated from one another.

24. Deduction device according to claim 22 or 23, characterized in that it comprises a series arrangement of at least two connected to an electrical conductor ionizing bodies (80; 91), between which an electrically insulated further ionization body (80; 91) is arranged.

25. Deduction device according to one of the preceding claims, characterized in that it comprises at least a first

Air flow outlet (35) for a first by the charging means (30; 87, 88), in particular the ionization device (29), ionizable or ionized or electrically neutralized Part of the air flow (27) and at least a second air flow outlet (36) for a second, not by the ionization device (29) ionizable or ionized or electrically neutralized part (27 ') of the air flow (27).

26. Deduction device according to one of the preceding claims, characterized in that it comprises a controller (55) for setting an operating mode ^{1 of} the fan assembly (26) and / or the loading means (30; 87, 88) in response to a sensor signal and / or a has temporal condition.

27. Deduction device according to one of the preceding claims, characterized in that the charging means (30, 87, 88) for ionizing the air flow (27) and / or for electrostatically charging the at least one surface at least one charging module (95, 96) comprise or form in that at least one module receptacle (97) for receiving the at least one, in particular with an air duct fluidly connected and / or arranged on an air outlet and / or a Luftleitprofil (32, 33) arranged on a housing (11) of the trigger device (10) include a charging module.

28. Loading module for a trigger device according to claim 27, characterized in that it forms the charging means (30; 87, 88) for ionizing the air flow (27) and / or for electrostatically charging the at least one surface at least one charging module (95, 96) and on a on a housing (11) of the trigger device (10), in particular a Luftleitprofil (32, 33), provided Modulaufnähme (97) for receiving the at least one loading module can be arranged.

29. Loading module according to claim 28, characterized in that it has an air inlet and / or an air outlet for the air flow (27) and / or has electrical contacts to the electrical connection of the at least one surface.