EP3445504A1

EP3445504A1 - Fume extraction device

Info

Publication number: EP3445504A1
Application number: EP17720388.2A
Authority: EP
Inventors: Jürgen Liebsch
Original assignee: Waldner Laboreinrichtungen GmbH and Co KG
Current assignee: Waldner Laboreinrichtungen GmbH and Co KG
Priority date: 2016-04-21
Filing date: 2017-04-18
Publication date: 2019-02-27
Also published as: US20210215361A1; DE102016107431A1; KR20180136955A; CN109070154A; JP2019519370A; CA3020295A1; WO2017182454A1

Abstract

Fume extraction device, in particular laboratory fume extraction device, comprising a housing (11) with an operating chamber (12) that is accessible to an operator (B) through an operating hole (19) in the housing (11); the operating chamber (12) is defined by a base (15), side walls (14, 17) and a cover (16); the operating hole (19) and/or at least one fresh air supply hole (30) in the area of the operating hole (19) is/are provided for allowing fresh air (Z) to flow into the operating chamber (12), and at least one waste air hole (34) in the area of the cover (16) is provided for allowing waste air (A) to escape. At least one filter holder (43, 44) for accommodating at least one filter element (41, 42) is placed upstream of the at least one waste air hole (34); the at least one filter holder (43, 44) is accessible through the operating hole (19) such that the filter element (41, 42) is accessible and replaceable from the operating chamber (12).

Description

off device

The invention relates to a fume hood, in particular a fume hood, comprising a housing with a working cannister accessible through a working opening of the housing for an operator located in a dwelling area in front of the working chamber outside the fume hood, the working chamber passing through a bottom wall , Side walls and a top wall is limited, wherein the working opening and / or at least one supply air opening in the region of the working opening, in particular close to the bottom wall, are provided for inflow of supply air into the working chamber and at least one exhaust air opening in the region of the top wall for the outflow of exhaust air, so that the supply air flows through the working chamber for entraining particles from the working chamber in the direction of the at least one exhaust air opening and flows out as exhaust air via the at least one exhaust air opening from the working chamber.

Such a take-off device is explained in WO 2012/062 478 A1. The exhaust device electrically conditions the supply air entering the working chamber so that the particles present in the working chamber, and possibly also the surfaces of the side walls, bottom wall and the like, are electrically discharged or neutralized. The neutralized particles or the neutralized surfaces of the working chamber prevent electrostatic adhesion of the particles to the surfaces of the working chamber, so they can be taken along with the air flow flowing through the working opening or the at least one Zuluftöffnung, well and effectively in the direction of at least one exhaust port , However, in some cases the particles are dangerous. For example, drugs in particulate form can enter the environment.

It is therefore the object of the present invention to provide an improved extraction device.

To achieve the object is provided in a take-off device of the type mentioned that at least one filter receptacle is arranged for receiving at least one filter element for filtering the exhaust air provided at the at least one exhaust port, wherein the at least one filter receptacle is accessible through the working opening, so that Filter element accessible from the working chamber and is replaceable.

The filter element is advantageously arranged on the filter holder in the flow direction in front of the exhaust air opening.

The supply air thus flows from the at least one inflow opening or the working opening directly through the working chamber, where it can take particles, dusts and the like other impurities to the exhaust port or the exhaust ports. The at least one inflow opening is or preferably comprises an opening which opens directly into the working chamber.

It is a basic idea that a filter element largely or completely filters out the particles from the exhaust air so that cleaned exhaust air reaches the exhaust air opening. At the same time, the at least one filter element is easily accessible, namely through the working opening and from the working chamber. The already existing work opening is, so to speak, the maintenance opening for the at least one filter element, so that no further maintenance opening, for example on a side wall, is necessary. This is particularly advantageous because in addition to such a maintenance opening usually space must remain free so that the maintenance opening remains accessible. The work opening, however, is already provided at the front of the trigger and must remain freely accessible to the operator. Another aspect is that also during the filter change of the at least one filter element exhaust air from the working chamber in the direction of the exhaust port and can flow through it, for example, promoted by a corresponding exhaust fan. Thus, a contamination of the operator who changes the filter element with particles is largely avoidable. For example, the particles fall off the filter element during the filter change. Namely, while the operator removes the at least one filter element from the filter holder, exhaust air may flow past the filter element into the exhaust port, possibly entraining particles falling from the filter element or other particles present in the working chamber to the exhaust port.

It is preferably provided that the filter element comprises, for example, a filter fabric and / or a filter paper and / or a filter fabric as filter medium.

Conveniently, the at least one filter element has a holding frame or a holding body, in which the respective filter means is held.

The at least one filter element is for example a filter cassette or comprises a filter cassette.

It is understood that, for example, two filter elements in the flow direction of the exhaust air can be arranged next to each other or behind one another at the filter holder. For example, the retaining means explained below are able to hold two or more filter elements arranged one behind the other in the flow direction of the exhaust air.

The at least one filter holder expediently comprises holding means for holding the at least one filter element. However, the holding means can also be provided on the filter element.

The holding means preferably comprise a hook arrangement and / or latching means and / or clamping means. Thus, the filter element can be hooked, for example, with one or more hooks. Such a hook can be provided for example on the filter holder.

Furthermore, it is possible for a latching projection to latch with a latching receptacle, the latching projection being arranged on the filter element or on the filter receptacle, and the associated latching receptacle being arranged on the respective other element of filter element and filter receptacle.

Furthermore, it is possible that the holding means comprise clamping means for clamping the filter element with the filter holder, for example at least one clamping bevel.

Combinations are readily possible, i. that, for example, the clamping means cooperate with locking means or the positive locking means. Thus, the holding means may also include a latch and a bolt receptacle or the like.

The holding means are expediently operated without tools. In particular, it is advantageous if a holding means, for example a hook, bolt or the like, has a handle portion or handle suitable for manual gripping. For example, the hook explained below may expediently be dimensioned so large that it can be grasped and operated manually.

It is advantageous if at least one retaining element is provided for the at least one filter element, for example a hook or hook projection or else another positive locking element or locking element, which is adjustable between a holding position in which the retaining element with the filter element in engagement, and a release position in which the at least one filter element is movable past the retaining element for removal from the filter receptacle and / or in which the at least one filter element is movable relative to the filter receptacle. It is also possible that the holding element is provided on the filter element, for example, represents a holding projection, which in engagement and out of engagement with a corresponding mating contour on the at least one filter receptacle can be brought. Thus, for example, the holding element in the holding position with the filter holder can be positively engaged, be released in the release position of the filter holder.

For example, may be provided on the filter element, a movable slide or a plurality of movable slide or pivot bolt or the like, which is engageable or disengageable with a corresponding mating contour on the at least one holding receptacle / are.

Preferably, the holding means comprise at least one pivotable bolt or cam, which is pivotable in front of the at least one filter element for holding the same on the filter holder.

Advantageously, a hook or an arrangement of a plurality of hooks can be provided, whose hook projection is adjustable, for example by a rotation of the hook about a pivot axis. An advantageous arrangement provides that at least two such holding elements or hooks are provided, for example on opposite sides of the at least one filter element or the filter holder. The holding elements or hooks can be pivoted away, for example, about pivot axes of the filter element in a release position, so that it is movable past the hook. In the holding position, it is advantageous if the hook engage behind the at least one filter element. It may be sufficient if exactly two such hooks or retaining elements are provided. It is also possible that only one hook or hook element or retaining element is provided, in particular in connection with the following measure.

A preferred embodiment of the invention provides that at least one Hintergreifkontur is provided on the at least one filter receptacle, for example, a U-shaped plug receptacle, a retaining projection or the like, with which the at least one filter element for attachment to the filter receptacle is engageable. For example, it is possible that the filter element on the one side is held by the retaining projection or the other Hintergreifkontur, while at a distance from the Hintergreifkontur at least one movable retaining element, for example, the aforementioned hook or cam follower, is provided. The Hintergreifkontur can be formed for example by a holding web or the like or include a holding web.

Of course, it is also possible that, for example, screw means or the like are provided in order to fix the at least one filter element to the filter holder fixed. Thus, for example, a rotary bolt, a screw thread or the like, be provided, which / which is manually operable by means of a handle or the like.

A preferred concept provides that the exhaust air from the working chamber can flow freely to the at least one filter element without a filter element upstream of the filter element. Thus, therefore, no pre-filter is present, but the at least one filter element forms in the flow direction of the supply air from the supply air opening or the working opening to the exhaust opening towards the first filter device. The exhaust air is purified by the at least one filter element, so to speak, before it flows into the exhaust air opening. The at least one filter element is thus expediently that filter element which is loaded by the exhaust air or particles contained therein or is subjected to the strongest load. However, as explained, the at least one filter element can be easily and ergonomically replaced by the work opening and the working chamber.

Appropriately, the at least one filter element is arranged directly in the exhaust air flow from the working chamber ago. The exhaust air flow from the working chamber thus flows directly from the working area upwards in the direction of the filter element.

In particular, it is advantageous if the at least one filter element or all filter elements of the discharge device is not preceded by a filter which filters a stream of air flowing in the direction of the working chamber. Furthermore, it is advantageous if in flow direction only the at least one filter element of the exhaust port is upstream or forms the single filter element. This does not exclude that, for example, two filter elements are arranged side by side in the flow direction, which are flowed through, so to speak, in parallel from the exhaust air flow. Even with this arrangement, it is possible that each of these two (or further) filter elements is upstream of another upstream in the flow direction of the exhaust air or downstream filter element of the exhaust port.

But it is also possible that a cover or cover plate for the at least one filter element, in particular as described below, is provided.

The extraction device expediently comprises at least one plate-like covering device or cover plate for covering the at least one filter element towards the working chamber.

The exhaust air can flow through at least one throughflow opening out of the working chamber in the direction of the at least one filter element and thus also in the direction of the exhaust air opening. The flow-through opening is provided, for example, next to the covering device or on the covering device. In the flow direction of the exhaust air to the exhaust port, the cover is upstream of the filter element.

The at least one flow-through opening is preferably a passage opening which has no filter element or the like.

For example, the at least one flow-through opening comprises flow-through slots, bores or the like.

The at least one flow-through opening may, for example, comprise one or more slits which are provided between a structure fixedly connected to the housing of the extraction device and the covering device. It is self-evident that a plurality of covering devices or cover plates can also be provided and / or that the covering device can be multi-part. Thus, for example, the handling of a plurality of smaller covering devices or a plurality of smaller segments, for example at least two segments, of a covering device can be simpler than that of a large-area covering device.

The covering device may for example be or comprise a so-called baffle plate.

Advantageously, the cover is arranged obliquely. A preferred concept provides that the cover is arranged, for example, obliquely to the rear wall or top wall or both of the working chamber.

It can be provided that the cover is permanently upstream of the filter holder. For example, a cover can be provided, which protrudes toward the filter receptacle and this covers at least partially. The at least one filter element is still movable past the stationary covering device, so that it can be arranged on the filter holder or removed from the filter holder. In addition to a stationary covering device, sufficient movement space for the filter element for attachment to the filter holder or removal from the filter holder is expediently provided.

However, a configuration is preferred such that the covering device is adjustable between an open position, in which it releases the at least one filter receptacle for removing and attaching the at least one filter element, and a covering position in which it at least partially covers the at least one filter element. For example, the covering device can be mounted displaceably and / or pivotably on the housing of the extraction device between the covering position and the open position. However, a concept is preferred in which the covering device can be completely removed from the filter holder is, so that the at least one filter element is freely accessible for a filter change.

A preferred concept provides that the at least one supply air opening comprises one or more of the supply air openings explained below:

Conveniently, a supply air opening is provided directly on the bottom wall of the working chamber, in the region of the working opening. There are also inlet openings laterally advantageous at the working opening through which, for example laminar air or supply air can flow into the working chamber. Thus, virtually a supply air flow is present around the work opening around, which prevents particles from entering the working chamber into the environment. Rather, any particles present in the environment are conveyed, as it were, into the working chamber and into the filter element and finally to the exhaust air opening.

The at least one supply air opening expediently comprises supply air openings which are provided on profile elements.

Advantageously, the extraction device comprises at least one aerator arrangement for generating the supply air flow or for prefetching the supply air. However, the aerator arrangement can also be provided or designed to generate an exhaust air flow or to advance the exhaust air. Furthermore, the aerator can also afford both, namely on the one hand promote the exhaust air, on the other hand, promote the supply air. For example, the aerator arrangement comprises at least one fan.

The extraction device is expediently provided that it has an electrical conditioning device for electrical conditioning, in particular neutralization, the supply air and / or at least one surface bounding the working chamber. For example, the surface can be electrostatically discharged. Advantageously, a conditioning device for the electrical conditioning of the supply air is provided in the extraction device, in particular for neutralization and / or for electrostatic charging or for the electrostatic discharge of the supply air.

The conditioning device can be arranged, for example, directly on or in front of the at least one supply air opening.

Preferably, the conditioning device comprises electrostatic charging means for electrostatically conditioning the supply air. The charging means are expediently arranged on or in a profile element, which in turn has at least one supply air opening through which supply air can flow into the working chamber.

Thus, the at least one filter receptacle is advantageously located in an upper section of the working chamber or a ceiling region of the working chamber, but is covered towards the front side of the housing. An advantageous concept provides, for example, that the at least one filter holder is arranged behind a front wall. The front wall as well as the already mentioned side walls defines, as it were, an area of the housing in which the at least one filter element is received and which is only open towards the working chamber downwards. It is also possible that a door, which is provided for closing the working opening, is arranged in front of the at least one filter receptacle in combination with this front wall or even alone. Thus, this door, for example, a sliding door or a swing door, the front of the housing, cover the at least one filter element or the filter holder for the filter element, even if the door completely releases the work opening or substantially completely releases when they their open position occupies. By way of example, the door is a sliding door which, in the open position, is displaced upward toward the top wall, but still covers the at least one filter receptacle from the front. Advantageously, it is provided that the at least one filter holder by a standing adult person, for example, a body size of 1, 60 m to 1, 90 m can be touched when the person stands on a floor in front of the work opening or on the bottom wall of the working chamber.

As already indicated above, it is advantageous that the working opening can be closed by a closure device, in particular a door, a sliding door or a folding door, which is accessible between an open position in which the work opening is accessible and a closed position in which the closure device the work opening closes, is adjustable. The closure device is equipped, for example, as a slide, which is adjustable to take the open position up or to take the closed position down.

Ergonomically favorable or favorable in terms of flow, the following measure may be provided in which it is advantageously provided that the at least one filter receptacle is arranged on the top wall close to a rear wall of the working chamber or of a side wall forming the rear wall. It is also possible that the filter holder is arranged directly on the rear wall near the top wall. Furthermore, it is possible that the filter holder has both a portion of the top wall and the rear wall close to the top wall or is arranged there. It can also be advantageous if the at least one filter receptacle is arranged on a rear upper side of the working chamber facing away from the working opening. Thus, the operator, for example, from the work opening forth obliquely behind the top grip to release the filter element of the filter holder or attach to the filter holder. Furthermore, it is advantageous if the supply air flows, so to speak from the work opening, in particular from the bottom wall forth obliquely behind the top and there passes the at least one filter element flowing through to the exhaust port.

Also, the aforementioned cover is ergonomically favorable obliquely behind the top (as seen from a front side of the trigger device). It is advantageously provided that the extraction device has at least two filter receptacles for receiving a respective filter element. Thus, each filter receptacle can each be a filter element releasably fastened. An advantage arises, for example, in that the filter elements can be smaller. Another or other advantage may be that during the exchange of the one filter element, the other filter element may remain on the other filter holder.

It is advantageous if each of the filter receptacles is assigned an exhaust air opening in each case. At each exhaust port can thus be provided in each case a filter receptacle for a filter element. Consequently, it is possible for the extraction device to have more than one exhaust air opening, namely, for example, at least two exhaust air openings. It is also possible for these multiple exhaust air openings, for example two exhaust air openings, to open out into a single exhaust air duct or to communicate fluidically with a single exhaust air duct. The respective filter receptacle and / or the exhaust air opening assigned to the filter element can be connected to the exhaust air duct - for example in the case of an arrangement of a plurality of filter receptacles and filter elements - with a single exhaust air duct.

It is understood that other filter receptacles and / or exhaust openings may be present. It is preferred if the filter receptacles or exhaust air openings or both are arranged next to one another in a row direction next to one another, for example between the side walls, which delimit the working chamber laterally next to the work opening.

It is advantageous if an exhaust air opening, which is associated with a filter element, in particular during the replacement of the filter element, is closable. It is preferably provided that the extraction device has at least one closure device for closing the at least one exhaust air opening. The closure device may comprise, for example, a slider, a flap or the like. An advantageous embodiment forms the disposal concept explained below.

A holder for holding a receptacle, for example a bag, a box or the like, is preferably provided on the at least one filter receptacle into which the filter or the filter element falls after detachment from the filter receptacle. Thus, the filter element does not fall into the open, so to speak, but rather into the receptacle. The receptacle expediently forms a system together with the extraction device.

It is preferred if the filter receptacle has a seal surrounding the filter receptacle. It is also possible that, alternatively or additionally, the filter receptacle has a contact surface, for example an annular contact surface, for a seal of the receptacle. The seal is preferably an O-ring. It can also be provided seals on the one hand on the filter holder and on the other hand also on the receptacle. In any case, it is possible on the basis of the at least one seal that the receptacle is tightly arranged around the filter receptacle for receiving the filter element to be exchanged can be arranged.

Preferably, the disposal of the filter element is configured as follows: a filter element receiving portion of the receptacle, for example, a lower portion of the aforementioned bag is preferably closable, while the receptacle is still arranged on the filter holder. Thus, the filter element remote from the filter holder can be safely confined in this lower portion or the portion of the receptacle which accommodates the filter element, as it were. For example, the receptacle above the filter element receiving portion of the receptacle is flexible and on the basis of example of a belt and / or a working tool, in particular a crimping, einschnürbar.

It is preferred if the holder for holding the receptacle is the same holder on which the cover is also held. preferential Thus, it is provided that the holder is provided for holding the receptacle for holding at least one provided for covering the at least one filter element to the working chamber covering device or is configured.

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

Figure 1 is a partially sectioned view of a trigger device from the in

Figure 2 is a detail D of Figure 1 is shown enlarged

FIG. 3 shows a front view of an upper part of the withdrawal device according to the above figures,

Figure 4 is a view obliquely from below into the trigger device according to the above figures, wherein a covering filter elements still covered

FIG. 5 shows the view according to FIG. 4, but with the covering device removed

Figure 6 shows an upper portion of a collecting container with a seal

7 shows a detail corresponding to FIG. 2, but with the collecting container according to FIG. 6, FIG.

FIG. 8 shows the take-off device in the view according to FIG. 1, wherein the collecting container according to FIG. 6 is arranged for a filter change in a position deviating from FIG. 7,

FIG. 9 shows a detail D2 from FIG. 8, Figure 10 is a schematically illustrated another embodiment of a

Filter receptacle, on which a filter element is positioned in a working position or filter position, and

Figure 1 1, the arrangement of Figure 10, wherein the filter element in a

Replacement is adjusted.

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 10 shown in the drawing to a stationary to be used deduction device, but could also be used for example by attaching rollers on the bottom as a mobile trigger device. The extraction device 10 comprises a housing 1 1, in the interior of which a working chamber 12 is arranged. The working chamber 12 delimits a working area 13, which is available to an operator for example for the research, processing or production of pure active substances, 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 at the rear by a rear wall 17, which is also a side wall per se. The side walls 14 and the rear wall 17 form a U-shaped configuration.

A substructure 18 or base, on which, as explained, for example, rollers could be arranged, forms a lower side of the triggering device 10. The substructure 18 may be, for example, a solid base or also contain receiving spaces, in particular closable receiving spaces, drawers or the like.

The working chamber 12 is accessible at the front through a working opening 19, so that an operator B, for example, with his arms or hands can engage 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 thus project forward in the direction of the working chamber 12 from the rear wall 17 and penetrate the visor 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 working opening 19 can be closed by means of a door 24. Of course you could call the door 24 as a window. The door 24 is designed as a sliding door and can be adjusted between an upper, the working opening 19 substantially releasing open position O and a lower closed position S, in which the door 24, the work 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, in particular powdered substances, such as pharmaceutical substances, toxic particulate matter or the like, protected, even if the door 24 assumes its open position O or at least a partially open position.

An opening of the door 24 is facilitated by a counterweight assembly comprising a tension member 26, on the one hand with the door 24, on the other connected to a counterweight 28. The counterweight 28 counteracts the weight of the door 24 and thus supports an opening of the door 24 or an adjustment in the open position O. The tension element 26, for example a pull rope, is guided via deflection rollers 27 in a conventional manner. The counterweight 28 runs up and down on the rear wall 17.

The operator B can comfortably grasp the door 24 on a handle 29 and adjust it between the open position O and the closed position S.

In the vicinity of the bottom wall 15 there is a supply air opening 30 through which supply air Z can flow into the working chamber 12. The supply air opening 30 may comprise a plurality of partial openings or a plurality of supply air openings 30 may be provided, for example as slots in an air guide body 31, in particular a corresponding air guide profile which extends transversely to the bottom surface 20 at the lower region of the working opening 29. Thus, the supply air Z can flow, so to speak broadband from below into the working chamber 12.

It is furthermore advantageous if supply air openings or inlet openings are provided in the region of the side walls 14 at the working opening 19 in a manner not shown or in the manner of the inlet openings 30A, so that supply air Z also flows laterally into the working opening 19, in particular even if the Closing device or door 24 assumes the closed position S. These supply air openings are arranged for example on or next to the guides 25 and / or provided on profiles that provide the guides 25.

If the operator B opens the door 24, that is adjusted to the open position O, supply air Z flows through the opening cross section of the working opening 19 into the working chamber 12 anyway.

The supply air Z is pre-conveyed through an aerator arrangement 37 to the at least one supply air opening 30, which has, for example, a ventilator 39. The fan 39 sucks, for example, air from the environment of the extraction device 10 and blows them into the air duct body 31, where it forms the supply air Z or a supply air flow.

It is advantageously provided that the supply air Z is electrically conditioned by means of an electrical or electrostatic conditioning device 32, i. for example ionized, neutralized, electrostatically charged or discharged electrostatically. The conditioning device 31 comprises, for example, corresponding electrostatically or electrically rechargeable surfaces or dischargeable surfaces, via which the supply air flow Z flows before it flows out of the supply air openings 30.

The supply air flow or supply air Z flows through the working chamber 12, as it were, from below, from the front of the extraction device 10 upwards, to the top wall 16, where exhaust air openings 34 and 134 are provided, through which the supply air Z then flows out as exhaust air A. The exhaust ports 34, 134 are provided, for example, at exhaust ports 33, 133, to the exhaust air ducts 35, 135 can be connected. The exhaust air ducts 35, 135 are connected, for example, with a blower or discharge into the environment. Thus, the working chamber 12 is, so to speak, flushed or flowed through by the supply air Z, so that a safe, for the operator B safe working space or work area 13 is available.

It is understood that the exhaust ports 33, 133 could also be connected to a single exhaust duct or that only a single Abluftan- connection 33 or 133 sufficient.

Advantageously, a lighting for the working chamber 12 is further provided on the top wall 16, which includes, for example, one or more lighting elements 36. The lighting elements 36 scatter their light or the lighting element 36 scatters with its light down toward the bottom wall 15. The lighting element 36 is closer to an upper portion of the working chamber 12 front-covering the front wall 38 as the exhaust ports 33, 133 which are closer to the Rear wall 17 are. However, the exhaust air A leaves the working chamber 12 through the exhaust ports 34, 134 not unfiltered, so that, for example, particles, in particular pharmaceutical particles, can get into the environment. To address this problem, a filter assembly 40 with filter elements 41, 42 is provided, which are held on filter receptacles 43, 44. The filter elements 41, 42 filter the exhaust air A before it flows through the filter elements 41, 42 associated exhaust ports 34, 134.

The filter elements 41, 42 are configured in the manner of filter cassettes, that is to say that the filter means 48 contained in the filter elements 41 are held, for example, on holding structures 49, in particular holding frames. The filter means 48 comprise, for example, a filter fleece, filter papers or the like other suitable for retaining particles or other contaminants of the exhaust air A suitable filter means.

The filter elements 41 are held by retaining means 45 on the filter receptacles 43, 44. The holding means 45 are manually operated by the operator B easily. The holding means 45 comprise for example hooks 46, which are pivotable about a pivot axis V, so that hook projections 146 of the hooks 46 engage under the filter elements 41, 42 (holding position, FIG. 2) or are moved away from the filter elements 42, 41 (release position, FIG. 3). , so that the filter elements 41, 42 are removable from the filter receptacles 43, 44.

The hook projections 146 project, for example, in front of the base body 246 of the hooks 46, which are arranged on a filter support 55, for example a plate, of the filter receptacles 43, 44. The main body 246 may be, for example, columnar. The base body 246 may in turn be rotatably mounted about the pivot axis V on the filter support 55 or the hook projections 146 are rotatably mounted relative to the base bodies 246 about the pivot axis V. In any case, the operator B can grasp the hook projections 146 and twist them away from the front side of the filter elements 41, 42, so that the filter elements 41, 42 can be removed from the filter receivers 43, 44. The hook projections 146 thus form handle sections or handle elements. expediently example, it is provided that on opposite longitudinal sides or transverse sides of a respective filter element 41 or 42 each have a hook 46 is provided. Thus, the hooks 46 can hold mutually opposite sides a respective filter element 41 or 42.

At the filter support 55, the exhaust air openings 34, 134 are provided upstream passage openings which are covered by the filter elements 41, 42. The exhaust air A thus flows through the filter elements 41, 42, then the passage openings and finally the exhaust ports 34, 134, which are expediently provided on the top wall 16.

It can be seen that the replacement of the filter elements 41, 42 is conveniently possible from below, from the working chamber 12. In this case, the operator may, for example, stop in front of the extraction device 10 or possibly stand on the bottom wall 15. In any case, the holding means 45 are easily accessible.

From the top wall 16 is suitably a front wall 47 to the working chamber 12 down from. The top wall 16, together with the upper portions of the side walls 14 and the rear wall 17, for example, an air duct, in which the filter assembly 40 is received. The front wall 47 expediently forms a diaphragm for the filter arrangement 40.

Thus, the removal or attachment of a cover 50, which is the filter elements 41, 42 upstream in the flow direction of the exhaust air A, very simple. The covering device 50 comprises, for example, a baffle plate or is plate-like. The cover 50 is held by a holder 51. The holder 51 comprises, for example, one or more support projections 52, which are arranged, for example, on the rear wall 17 and project to the working chamber 12. Furthermore, the holder 51 includes, for example, movable latch or locking elements 53, which are arranged on the front wall 47, in particular at its free end region. The locking elements 53 form a locking device 53A. The holder 51 can also be a bearing 52A for supporting the cover 50 between an open position OS (shown in dashed lines in Figure 2), which is provided for removing or attaching the filter elements 41, 42, and a cover AS, for example, for pivotally supporting the cover 50, include. In the covering position AS, the locking elements 53 or the locking device 53A can be used for locking the covering device 50.

The covering device 50 can be completely removed from the filter holder 43, 44, so that the filter elements 41, 42 are freely accessible for a filter change. This is possible with both of the above embodiments. For example, the cover 50 may be disengaged from the support projections 52. Also, a bearing receptacle of the bearing 52A may be open or obviously configured. For example, a bearing receptacle is possible, which is open to the top and / or laterally, so that a bearing pin, which engages in the bearing receptacle, is removable from the storage receptacle upwards or laterally.

The covering device 50 largely covers the filter arrangement 40 towards the working chamber 12. However, 53 through-flow openings 54 are provided, in particular in the region of the latch, for example, slots whose longitudinal extent extends transversely between the side walls 14, through which the exhaust air A from the working chamber 12 to the filter elements 41, 42 can flow. The flow-through openings 54 can, for example, also form gripping openings for engagement by the operator B so that the gripper 50 can grasp the cover device 50 more easily and remove it from the holder 51 or fasten it to the holder 51.

The operator B can during operation of the trigger device 10, so while the exhaust air A is sucked through the exhaust ports 34, 134 or flows through the exhaust ports 34, 134, dispose of the filter elements 41, 42.

As a result, the risk is low that the operator B comes into contact with particles or other dangerous good. During the replacement of a filter element 41 or 42, it may be advantageous if the respectively associated outflow opening 34, 134 can be closed. For example, a closure device 80, for example a slide 81, may be provided to close an outflow opening 34 or 134. The example of the outflow 34, this is shown in the drawing. The slider 81 can be adjusted, for example, for replacing or before replacing the filter element 41 in the closed position shown in dashed lines, so that it closes the discharge opening 34. The exhaust air A then flows through the other filter element 42 and the other exhaust port 134, so that even when the filter element 41 is removed from the exhaust port 34, no unfiltered exhaust air A flows through the exhaust port 34.

A very low contamination disposal principle is made possible by a receptacle 70. The receptacle 70 comprises, for example, a holding frame 71 for holding a bag 72. The bag 72, which may also be referred to as a receiving bag, hangs down from the holding frame 71 in the illustration according to FIG. 1 and is preferably flexible. The filter element 41 or 42 may fall after loosening or opening of the holding means 40 down into the bag 72, where it then comes to rest, for example, at the bottom of the bag 72. Preferably, the bag 72 is so long that its bottom portion can be supported on the bottom wall or bottom surface 20 of the working chamber 12. Thus, the filter element 41 does not readily pierce the bottom of the bag 72 as it falls down.

The holding frame 71 is releasably securable to a holder 60 below one or both filter receptacles 43, 44. For example, the holder 60 includes hooks 61, 62 on the rear wall 17 and the front wall 47, in which the holding frame 71 can be hung. The holding frame 71 then surrounds the respective filter element 41 or 42 dense or substantially dense, so that it can be released from the filter holder 41 or 44 and fall into the bag 72. It is advantageous that the bag 72 is flexible, so that the operator B can grasp the wall of the bag 72 engaging the holding means 45. After the respective filter element 41 or 42 has fallen into the bag 72 and comes to rest in the lower time or portion 74 of the bag 72, this section 74 can be isolated, for example, by looping a band 73 around the bag 72, so that the bag 72 is laced and the filter element 42 or 41 closed in section 74 is chambered.

An even higher degree of freedom from contamination can be achieved with the collecting container 170 shown in FIG. At its holding frame 171, which holds a bag 72, namely, for example, circumferential seals 176 and / or an end-side seal 175 are provided, the tight-fitting, for example, on a contact surface 56 of the filter support 55 can be applied. This can be seen, for example, in Figures 8 and 9. The holding frame 171 can namely, in the space between the front wall 47 and the rear wall 17 into it, so to speak into the filter chamber of the filter assembly 40, are moved into, so that he frontally with the seal 175 at the contact surface 56 is applied. However, a radial contact surface, in particular for the circumferential seals 176, can also advantageously be provided, which is provided in particular by a seal 157 of the filter holder 43, 44. For example, the seal 157 is an elastic sealing surface on the front wall 47 (shown schematically in FIG. 8).

However, one can also easily handle the collecting container 170 similar to the receiving container 70 for a filter change, which is indicated in FIG. For example, the holding frame 171 can also be hung or hooked into the holder 51, in which case, for example, the peripheral seals 176 come into play and, for example, can seat tightly against at least one sealing contour, for example on the front wall 47 (only indicated in the drawing) , not explicitly shown).

It is also clear from this embodiment according to FIG. 7 that the holder 51, which is provided for holding the covering device 50, can simultaneously form a holder for the collecting container 170. Thus, therefore, for the covering device and the collecting container can not be provided with separate holders.

Moreover, in the exemplary embodiment according to FIGS. 1 and 2, it becomes clear that the holders 51 and 60 can have common components, for example the movable latches 53 and / or the hooks 62.

FIGS. 10 and 11 show a further exemplary embodiment. On a filter receptacle 243, which may be provided instead of the filter receptacles 43 and / or 44, for example, a bearing 252 is provided on which a holder 250 is arranged for the filter element 41. The holder 250 has a plug-in receptacle 251 into which the filter element 41 or 42 can be inserted. The plug-in receptacle 251 preferably receives the filter element 41, 42 in a form-fitting manner. Based on the bearing 252, the filter element 41, 42 between the exhaust air opening 34 so to speak covering and in any case for filtering the exhaust air A provided filter position FS and a remote from the exhaust opening 34 Auswechselstellung AW adjustable. In the replacement position AW, the filter element 41, 42 can be inserted into the plug-in receptacle 251 or taken out of it. This facilitates the filter change.

In the fixing position FS, the filter element 41, 42 by means of a bolt 246, which is arranged, for example, immovable and / or pivotable on the housing 1 1, are locked. In its unlocked position (shown in dashed lines in Figure 1 1 in solid lines and in Figure 10), the latch 246, the filter element 41, 42 for adjusting, in particular pivoting, in the exchange position AW free. In its locking position (shown in solid lines in FIG. 10), the latch 246 locks the filter element 41 in the filter position FS.

It should be noted that the bearing 252 is also a sliding bearing and / or

Swiveling sliding bearing can be.

Claims

claims

1 . Extraction device, in particular fume hood, which has a housing

(1 1) with a working chamber (12) which is accessible through a working opening (19) of the housing (1 1) for an operator (B) located in a residence area frontally in front of the working chamber (12) outside of the trigger device ( 10), wherein the working chamber (12) by a bottom wall (15), side walls (14, 17) and a top wall (16) is limited, wherein the working opening (19) and / or at least one supply air opening (30) in the region Working opening (19), in particular near the bottom wall (15), for the inflow of supply air (Z) in the working chamber (12) and at least one exhaust port (34) in the region of the top wall (16) are provided for the outflow of exhaust air (A) so that the supply air (Z) the working chamber (12) for entrainment of particles from the working chamber

(12) flows in the direction of the at least one exhaust air opening (34) and as exhaust air (A) via the at least one exhaust port (34, 134) flows out of the working chamber (12), characterized in that at the at least one exhaust port (34, 134 ) at least one filter receptacle (43, 44) for receiving at least one filter element (41, 42) provided for filtering the exhaust air (A) is arranged, wherein the at least one filter receptacle (43, 44) is accessible through the working opening (19), so that the filter element (41, 42) of the working chamber (12) is accessible and replaceable ago.

2. extraction device according to claim 1, characterized in that the at least one filter holder (43, 44) and / or the at least one filter element (41, 42) holding means (45), in particular a hook arrangement (46) and / or Locking means, for holding the at least one filter element (41, 42) on the filter holder (43, 44).

3. Deduction device according to claim 2, characterized in that the holding means (45) comprise at least one holding element, in particular a hook projection (46), which between a holding position, in which the at least one holding element with the at least one filter element (41, 42). or the filter receptacle (43, 44) is positively engaged, and / or that a release position, in which the at least one filter element (41, 42) is movable relative to the filter receptacle (43, 44) is adjustable and / or that the holding means (45 ) can be actuated without tools and / or by means of at least one handle section suitable for manual gripping.

4. Deduction device according to one of the preceding claims, characterized in that at least one rear engagement contour is provided on the at least one filter receptacle (43, 44), with which the at least one filter element (41, 42) for attachment to the filter receptacle (43, 44) is engageable.

5. extraction device according to one of the preceding claims, characterized in that the exhaust air (A) from the working chamber (12) without a the at least one filter element (41, 42) upstream filter element freely to the at least one filter element (41, 42) can flow ,

6. Deduction device according to one of the preceding claims, characterized in that it comprises an aerator (37) for advancing the supply air (Z) and / or the exhaust air (A).

7. Deduction device according to one of the preceding claims, characterized in that it comprises an electrical conditioning device (32) for electrical conditioning, in particular neutralization and / or electrostatic charging and / or electrostatic discharge, the supply air (Z) and / or at least one of the working chamber ( 12) has delimiting surface.

8. extraction device according to one of the preceding claims, characterized in that it comprises at least one, in particular plate-like covering means (50) for covering the at least one filter element (41, 42) to the working chamber (12) out.

9. Deduction device according to claim 8, characterized in that on the covering device (50) or next to the covering device (50) at least one throughflow opening for the exhaust air (A) from the working chamber (12) in the direction of the at least one filter element (41, 42) is provided.

10. extraction device according to claim 8 or 9, characterized in that the covering device (50) obliquely with respect to a rear wall (17) or the top wall (16) of the working chamber (12).

1 1. Deduction device according to one of claims 8 to 10, characterized in that the covering device (50) between an open position (OS), in which they at least one filter receptacle (43, 44) for removing and attaching the at least one filter element (41, 42). releases, and a covering position (AS), in which it at least partially covers the at least one filter element (41, 42), is adjustable.

12. Deduction device according to claim 1 1, characterized in that the covering device (50) by means of a bearing (52A) displaceable and / or pivotally mounted on the housing (1 1) of the extraction device between the covering position (AS) and the open position (OS) ,

13. Deduction device according to one of claims 8 to 12, characterized in that it comprises a locking device (53) for locking and / or holding the cover device (50), in particular in the covering position (AS).

14. Deduction device according to one of claims 8 to 13, characterized in that the covering device (50) of a holder for holding the covering (50) on the housing (1 1) provided holder (51) is removable.

15. Deduction device according to one of the preceding claims, characterized in that the at least one supply air opening (30) an inlet air opening (30) directly to the bottom wall (15) of the working chamber (12) in the region of the working opening (19) and / or lateral inlet openings ( 30A) at the work opening (19).

16. Deduction device according to one of the preceding claims, characterized in that the at least one filter receptacle (43, 44) behind a front wall (38) and / or one for closing the work opening (19) provided door, if this their the working opening (19) completely or substantially completely releasing open position (O) assumes, is arranged.

17. Deduction device according to one of the preceding claims, characterized in that the at least one filter receptacle (43, 44) on the top wall (16) close to a rear wall (17) of the working chamber (12) forming the side wall (14, 17) or at the rear wall (17) is arranged near the top wall (16) and / or is arranged on a rear upper area of the working chamber (12) facing away from the work opening (19).

18. Deduction device according to one of the preceding claims, characterized in that it comprises at least two filter receptacles (43, 44) for receiving in each case a filter element (41, 42).

19. Deduction device according to claim 18, characterized in that on each filter receptacle (43, 44) each have an exhaust port (34, 134) is provided and / or that the filter receptacles (43, 44) with a single exhaust duct (35) are fluidly connected.

20. Deduction device according to one of the preceding claims, characterized in that it comprises at least one closure device (80) for closing the at least one exhaust air opening (34, 134), in particular during an exchange of the exhaust air opening (34, 134) associated filter element (41, 42 ), having.

21. Deduction device according to one of the preceding claims, characterized in that at the at least one filter receptacle (43, 44) is arranged a holder (60) for holding a receptacle (70), in particular a bag, into which the filter element (41, 42 ) falls after loosening of the filter holder (43, 44).

22. Deduction device according to claim 21, characterized in that the extraction device and the receptacle (70) form a system.

23. Deduction device according to claim 21 or 22, characterized in that a filter element (41, 42) receiving portion (74) of the receptacle (70) in the filter receptacle (43, 44) arranged state of the receptacle (70) is closable, in particular by means of a working tool and / or a closure band (73).

24. extraction device according to claim 21, 22 or 23, characterized in that the filter holder (43, 44) surrounding the filter holder (43, 44) seal (157) and / or a contact surface (56) for a seal (175) of the Receiving container (70), so that the receiving container (70) tight fitting around the filter holder (43, 44) for receiving the filter element to be replaced (41, 42) can be arranged.

25. Deduction device according to one of the preceding claims, characterized in that the filter holder (43, 44) has at least one plug-in receptacle (250) for insertion and / or plugging of the at least one filter element (41, 42).

26. extraction device according to one of the preceding claims, characterized in that the filter holder (43, 44) at least one bearing (252) for the at least one filter element (41, 42), by which the filter element (41, 42) between a to Replacement provided and from the at least one exhaust port (34) remote exchange position (AW) and one of the at least one exhaust port (34, 134) for filtering the exhaust air (A) provided filter position (FS) is adjustably mounted.