EP2864709A1

EP2864709A1 - Ventilation arrangement with a vapour extraction hood

Info

Publication number: EP2864709A1
Application number: EP13734329.9A
Authority: EP
Inventors: Heinrich Wagener
Original assignee: Wagener Heinrich
Current assignee: Wagener Heinrich
Priority date: 2012-06-23
Filing date: 2013-06-19
Publication date: 2015-04-29
Anticipated expiration: 2033-06-19
Also published as: PL2864709T3; EP2864709B1; DE102012012551A1; WO2013189598A1

Abstract

A ventilation arrangement with a vapour extraction hood, particularly in the form of a fume extractor for the kitchen area, can be connected by means of an outlet connector to a ventilating system and has a housing-like structure. In the installed position, the extractor, together with an upper cover part and longitudinal and transverse side parts angled off therefrom forms a vapour receiving space open towards the bottom. From this space, vapour containing water and/or fat is received via a separator in at least one channel and routed as largely cleaned exhaust air to the outlet connector. The channel is furnished with a return connection capturing at least part of the filtered exhaust air. The vapour extraction hood according to the invention is furnished with at least one branch channel forming the return connection in such a manner that part of the clean air can be conveyed by means of the branch channel out of the area of a distribution shaft or the channel directly into the vapour receiving space.

Description

Ventilation arrangement with an extractor hood

The invention relates to a ventilation arrangement with a vapor extraction hood provided according to the preamble of claim 1.

From DE 10 2010 049 363 A1 a ventilation arrangement with an extractor hood is known in which in the region of a separator filtered exhaust air is received via a distribution well so that an adjustable to the respective steam load ventilation system is effective. An additional supply line can be integrated into this hood construction in such a way that fresh air can be supplied to the extractor hood in the vicinity of the extractor hood. In the case of an extractor hood according to DE 36 23 210 A1, the vertical air flow upstream of the separator is intensified by detecting a partial air flow behind the separator and leading it downwards into the area of the cooking surface, so that an additional direct delivery jet is introduced into the suction air portion and adverse eddies occur.

Starting from this basic construction with a distribution well, a generic type vapor extraction hood is known in which, starting from a distribution shaft containing a UVC system, a return connection which detects a partial volume of the filtered and disinfected exhaust air is integrated into the multi-layered wall of the hood construction (WO 2012/055504 A1 ), so that a compact structure with variable positioning possibilities is achieved. In this case, the partial volume of the UV light irradiated and filtered exhaust air in the area behind the separator optional

CONFIRMATION COPY be returned from the distribution shaft or a transfer chamber into the vapor receiving space. A mixture with fresh air is also provided for this professional hood design. According to EP 0 401 583 A1, a construction which can be used in private kitchens as a circulating air hood with only one fan is shown. In the area of an air treatment chamber, a peripheral vortex nozzle is intended to improve the delivery of the exhaust air via the fan to a passive exhaust air line. The central "circulating air blower" generates the exhaust air flow, serves for the horizontal generation of pressure and causes edge eddying, so that overall only a small exhaust air disposal is possible. In a similar extractor hood according to DE 10 2006 032 477 A, this is designed as a cuboid housing, so that a closed filter box is provided for private cooking areas. In this case, the only fan of the system on the output side interacts directly with respective separator and filter elements, so that this fan is exposed to disadvantageous high loads and the filter performance is adversely limited.

The invention is concerned with the problem of providing a ventilation arrangement for a located on a central ventilation hood in which with little technical effort especially in large kitchens variably deployable assembly for exhaust air return to the low installation height having hood system is realized, while the in The kitchen fumes sucked in the extractor chamber can be influenced in an optimal flow orientation towards the separator and overall energy savings are achieved in comparison to known extractor hoods even with comparatively low supply of fresh air. The invention solves this problem with a ventilation arrangement with an extractor hood according to claim 1. Further advantageous embodiments emerge from the claims 2 to 21.

The ventilation arrangement with connected to a central extraction hood is provided with a return connection, which according to the invention at least one extending outside of the particular limited by the ceiling part and the longitudinal and transverse side parts vapor receiving space extending branch channel as a functional additional part of the system. This is designed as a variable to the construction of the respective hood customizable additional module. In accordance with the customer-specific installation conditions, this branch duct enables optimum control and distribution of an exhaust air flow, in particular in the area of commercial kitchens on ships connected to a central exhaust system, so that control and return flow from the extractor hood can be achieved Control automatic significant energy savings can be achieved.

The structurally variable executable concept of the branch channel provides that with this a the exhaust air "dividing" recirculation system is integrated into the hood. With the branch channel is achieved by a partial return of filtered exhaust air also targeted influencing the sucked into the extractor chamber before the separator Wrasens. At the same time, with the partial volume of the exhaust air guided via the return connection of the branch channel, a flow generated system with which an unwanted escape of moisture-containing haze can be avoided in the environment of the hood.

The circulating air partial volume supplied via the branch duct and a transfer chamber into the extractor chamber can be controlled and directed in fluidic optimization such that this partial volume branched off from the "heated" exhaust air flows only in the area below the extractor hood near its ceiling part. In this case, it is avoided that exhaust air enters the surrounding space, and at the same time the ascending vapor can be deflected in its direction of movement towards the separator, such that a fluidically influenced air-vapor mixture is detected in the extractor chamber and discharged from it.

This partial volume of the exhaust air is thereby discharged in particular from the located on one of the side parts transfer chamber by means of a fan, so that in the vicinity of the transfer chamber, a negative pressure in the vapor receiving chamber is effective and the rising from the surrounding space vapors a delivery impulse toward the transfer chamber opposite separator experiences.

This makes it clear that the extractor hood can be optimally controlled with a suction-blower combination in the vicinity of its separator. This largely closed with regard to the above-described air circulation circuit sub-system of the air and Wrasenleitung is constructed so that "only purified" exhaust air from the return connection can be used. Thus, the previously usual blowing of fresh air can be reduced to a minimum and energy saved. At the same time, the recirculated partial volume affects the central extractor connected to the extractor hood so that - due to the "recirculated" partial volume - lower extraction power achieves an energy saving of 20% to 60% (based on the total circulated air volume) at the extractor hood can be.

The hood system with the outer branch channel can be adapted to the installation conditions so that an overall flat construction is achieved and in particular the requirements for headroom in the area of kitchen equipment on ships are ensured. The flow direction of the emerging from the transfer chamber subvolume can be optimally adjusted in the fan, so that in the region of variable installation conditions, in particular concerning the inclination of the filter surface, adjustable separator a maximum demand of vaporous air mixture can be achieved.

The manufacturing optimization of the ventilation arrangement provides that the branch duct advantageously extends above the hood receiving space substantially single-layer bounding and opposite both connected to the distribution well and with the transfer chamber ceiling part. It can be provided at variable positions of the branch channel of the respective sub-volume of the filtered exhaust air separating fan. With regard to the size of the ventilation arrangement, the construction provides that several branch channels provided with a respective fan open in the area of the transfer chamber. The sucked by means of the fan sub-volume enters the front cover having a transfer chamber, in which case a steering is performed such that the sub-volume of the filtered exhaust air can flow with a substantially parallel to the ceiling portion of the hood extraction direction. Following this conveyance direction, which can be influenced by the cover of the transfer chamber, it is provided that the sub-volume, in particular through nozzles, can be guided to the opposite separator of the distribution shaft largely without changes in direction, for example by avoiding lying components as a deflection. It is understood that several flow nozzles can be provided as a cover in the region of the transfer chamber. For internal flow control in this area, it is provided that the fan or the associated flow nozzles can be closed by means of respective ventilation flaps against the conveying direction of the partial volume.

Starting from the basic construction according to WO 2012/055504 A1, it is provided that, according to the invention, an outlet opening into the branch duct is provided in an upper subregion of the distribution shaft which is bounded by the ceiling part and the outlet pipe cooperating with the central exhaust can be connected to the distribution duct at a distance from this outlet opening , In an advantageously compact design of the branch channel is provided in the region of its outlet directly with the at least one fan. Starting from this intake of the fan, the subsequent branch channel is guided in the form of a multi-section pipe bend leading to the transfer chamber and opens in front of their provided with a cover outlet. In the area are Provided flow nozzles, with which the introduced partial volume of the exhaust air is passed into the vapor receiving space.

It is provided that on the other hand of the vapor receiving chamber directed to this separator defined in front of the distribution shaft to the adjacent ceiling portion at an acute angle inclined intake. Thus, the parallel to the ceiling part of the transfer chamber exiting flow of the "purified" exhaust air can be optimally sucked and directed to the rising haze. It is envisaged that the intake of the inclined built-in separator may have different inclination angle in different versions. It is also conceivable that this suction position of the separator by hand or by means of an actuator - according to the respective delivery rates of the system - can be performed adjustable.

The construction of the extractor hood provides in a second embodiment that the distribution shaft can be provided with a space extending behind the separator chamber hood approach. This hood attachment is placed directly on the outlet of the extractor hood and defines only one outlet of the distribution shaft. From this hood approach can then - be branched off to the transfer chamber - at largely variable position. In this case, the usable for the diversion of the partial volume of the exhaust fan is provided directly in the area connected to the hood approach to the branch channel discharge. Advantageously, the fan of this branch channel - in particular under the aspect of improved accessibility - be arranged at the outlet end of the branch channel in the region of the transfer chamber.

This concept with the outlet of the distribution shaft forming hood approach provides that even several branch channels - with corresponding fans - combined attack on this hood approach.

For the operation and control of this system with hood approach is provided that it is additionally provided in the region of the outlet opening of the distribution shaft with a control flap. This control flap can be displaced by means of a drive member or by hand, so that a closed or opened position for the distribution shaft is provided according to the respective usage situation. In particular, it is provided that the control flap can also be infinitely adjusted according to the respective suction and thus the volume of air to be delivered is influenced.

The variably conceivable control concept on the basis of the central ventilation or extraction provides that the decentralized conveyor components in the extractor hood can be adjusted by means of a programmable control unit to a respectively optimal state of the exhaust air discharge and the partial exhaust return and thus a substantial energy saving in the overall system, in particular a passenger ship with several suction positions, is achievable. Further details and advantageous embodiments of the invention will become apparent from the following description and the drawing in which two embodiments of the ventilation arrangement according to the invention with return connection are illustrated in more detail. In the drawing: a perspective bottom view of a first embodiment of the hood according to the invention, a perspective plan view of the hood according to FIG. 1, a partially sectioned side view of the hood according to a line III-III in Fig. 2, a plan view of the hood according to FIG 4 shows a partially sectioned front view of the extractor hood according to a line VV in FIG. 4, a partially sectioned side view similar to FIG. 3 with a second embodiment of the extractor hood,

7 is a sectional end view of the extractor according to a line VII-VII in Fig. 6, 8 is an enlarged detail view in the region of the hood approach with a control valve located in the closed position,

9 is a sectional view similar to FIG. 8 with an open position of the control flap, and

10 is a side view similar to FIG. 6 with additional items for

Control of the hood connected to a central ventilation of a ship o. The like. Systems.

In Fig. 1, a generally designated L ventilation arrangement (Fig. 2) is shown in an oblique view from below, to which assembly a designated overall by 1 extractor hood is connected. This extractor hood 1 is based on a construction according to WO 2012/055504 A1, wherein such hoods are provided in the form of a fume hood, in particular for the kitchen area of a ship's equipment.

The extractor hood 1 in this case has a known housing-like construction and can be connected to a venting system 3 by means of an outlet connection 2 or the like. This extractor hood 1 is provided with an upper ceiling part 4 and in each case of this angled longitudinal and transverse side parts 5, 6 and 7, 8, so that in the installation position downwardly open vapor receiving chamber 9 is formed. Such extractor hoods 1 act in particular with an external suction drive (central ventilation 62, Fig. 10) together, by means of which an air flow S is generated so that from the extractor chamber 9 out water and / or greasy vapor via a separator 10 in a generally designated K channel in the form of a distribution shaft 1 is received and forwarded as largely cleaned exhaust air T (dashed line, Fig. 3) to the outlet port 2 out.

In this case, the provided as a distribution well 11 channel K is provided with at least one a partial volume TV of the filtered exhaust air T detecting return connection TR. This return connection TR opens to the vapor receiving chamber 9 in the area of at least one transfer chamber 30. At the outlet of which a flow direction TR "of the recycled partial volume TV 'influencing cover 34 is provided.

The system according to the invention of the extractor hood 1 provides (as shown in FIGS. 1 to 9) an optimized return connection TR, the latter being connected to a branch channel 50.1 (FIG. 2) or 50.2 (FIG. 2) which can be connected to the hood plates as an additional assembly 6). With this branch channel 50, a variably configurable additional module is provided. This forms a substantially outside of - from the ceiling part 4 and the longitudinal and transverse side parts 5, 6, 7, 8 limited - Dunstaufnahmeraumes 9 extending while the region of the distribution shaft 11 with the transfer chamber 30 connecting return connection TR. This ensures that by means of variable versions of this - constructive simplifications of the known "integrated" hoods causing - branch channel 50th a partial volume TV of the cleaned exhaust air from the region of the distribution shaft 11 is largely conveyed directly into the transfer chamber 30. By means of respective guide means, the partial volume TV can be specifically forwarded from the transfer chamber 30 into the vapor receiving chamber 9.

From a synopsis of the two illustrated embodiments of the branch channel 50.1 and 50.2 (according to FIG. 3 or FIG. 6) it becomes clear that the respective branch channel 50.1 or 50.2 can advantageously be arranged such that it is essentially single-layered above the vapor receiving space 9 delimiting and opposite to both the distribution shaft 11 and the transfer chamber 30 connected to the ceiling part 4 extends. It is also conceivable that a branch channel is branched off from the region of the distribution shaft 11 in a manner not shown, that with a running adjacent to or below the hood 1 line arranged in the region of the longitudinal and transverse side parts 5, 6, 7, 8 return connection is shown (not shown) and thus the height H of the hood 1 is advantageously reduced. It is also conceivable that the system is also provided in the region of the transverse side parts 7, 8 with transfer chambers of the type described above.

For efficient use of the respective branch channel 50.1 or 50.2, it is provided that these each interact with at least one fan 51 separating the partial volume TV from the filtered exhaust air T as activatable conducting means. From the sectional views according to FIG. 5 and FIG. 7 it becomes clear that in the area of the respective transfer chambers 30 several are provided with respective fans 51 Branch channels 50.1 and 50.1 'as well as 50.2, 50.2', 50.2 "and 50.2"'merge. This opens up further options for controlling and returning the respective partial volume TV (FIG. 10).

With this branch channel concept according to the invention, a further optimization in the area of the respective transfer chamber 30 is also connected. It is advantageously provided that the partial volume TV of the filtered exhaust air T which can be led out of the transfer chamber 30 in the region of the cover 34 flows in a conveying direction essentially parallel to the cover part 4 of the extractor hood 1 - according to TV '- (FIGS. 3, 6) ). This ensures that the partial volume TV flowing from the transfer chamber 30 can reach the separator 0 of the distribution shaft 11 largely without changes in direction. For this purpose, each acting as an obstacle components have been removed in this area. An additional improvement of this optimally controllable flow path is provided that the transfer chamber 30 is additionally provided in the region of its cover 34 with respective flow nozzles 52.

In the area of the transfer chamber 30 or its flow nozzles 52 it is provided that respective ventilation flaps 53 are arranged here. In order to prevent accidental conveyance of suction air or the like acting against the conveying direction TV 'in the system into the branch channel 50.1 or 50.2.

The embodiment of the extractor hood 1 according to FIG. 1 to FIG. 5 is characterized in that, in an upper partial area of the upper part bounded by the ceiling part 4, Partial shaft 11 (FIG. 3) is provided in the branch channel 50.1 opening outlet opening 54 and at a distance A to this outlet opening 54 of the known outlet 2 for the venting system 3 to the distribution shaft 11 is connected. In this embodiment of the extractor hood 1 it is provided that the branch channel 50.1 is provided directly in the region of the outlet opening 54 with the at least one fan 51 so that from this the partial volume TV is pressed into the interior of the branch channel 50.1. It is also conceivable that the branch channel 50.1 is provided in the region of its outlet opening 55 (FIG. 3) toward the transfer chamber 30 with the at least one fan 51 (not shown).

From the side view of FIG. 3 is also clear that the branch channel 50.1 in the form of a plurality of sections 56, 56 ', 56 "having pipe bend is guided to the transfer chamber 30 out.

An optimization of this construction with "overhead recirculation" as an additional module is achieved in that the adjoining the longitudinal side 6 and directed to the extractor chamber 9 separator 10 of the distribution shaft 11 now an adjacent to the ceiling part 4 point at an angle inclined intake position with variable angular position (angle W) can define. This corresponding "steep" or "flat" predetermined intake position W of the separator 10 can be designed by a non-illustrated support connection (at P or P ') that here an adjustment for the separator 10 is provided. This adjustment of the intake position W can be done manually or by means of a motor drive (also not shown). For the angular position according to angle W while an inclination in the range of 35 ° to 70 °, preferably 58 °, provided.

In Fig. 5 shows the partially sectioned rear view (with open distribution shaft 11), the arrangement of the two fans 51 in the region of the branch channels 50.1 and 50.1 '. In this case, the per se known UV tube system 35 is visible, with which in the region of the distribution shaft 11 immediately behind the separator 10 ozone formation is effected, such that in addition to the antibacterial effect in the filtered exhaust air contained particles are crushed and the suction. 3 get to the vent.

From a synopsis of FIGS. 6 to 9, a second embodiment of the extractor hood 1 with the branch passage generally designated 50.2 becomes clear. In this case, the distribution shaft 11 is provided with a space located behind the separator 10 space K and connectable to the outlet 2 of the hood 1 hood extension 57. This hood projection 57 is arranged so that the branch channel 50.2 can be led to the transfer chamber 30 from there (FIG. 6).

It is understood that advantageously at least one fan 51 (FIG. 6) is provided in the region of the branch channel 50.2 branched off from the hood extension 57. This can be connected as shown (Fig. 6) in the region of the transfer chamber 30 to the branch channel 50.2. It is likewise conceivable to arrange at least one fan 51 at the other end in the region of the outlet opening 59 of the hood attachment 57. NEN. In this construction of the extractor hood 1 with the hood projection 57, it is provided that several of the branch channels 50.2 ', 50.2 ", 50.2'" (FIG. 7) can also be branched off into the transfer chamber 30.

A particular advantage of this construction with the hood projection 57 results from the fact that it can be provided in the region of its directed to the distribution shaft 11 inlet opening 58 with a motor-driven control flap 59. With this control flap 59, a complete closure of the system can be achieved in the closed position (FIG. 8), so that unwanted air leakage from or into the vapor receiving chamber 9 is avoided. The control flap 59 can be displaced by means of a drive member 60 in the open position shown in Fig. 9 (arrow SK). It is also conceivable that a continuous adjustment of the control flap 59 is possible and this can also be displaced by manual operation. In particular, the control flap 59 cooperates with a control unit 63 (FIG. 10) provided for optimizing the exhaust air movement.

The above-described system of the air duct with "external" branch duct 50.1, 50.2 can be designed in a further simplified design, for example, by providing the branch duct with an extension which replaces or illustrates the transfer chamber 30 shown. This extension then has the direction of the vapor receiving chamber 9 conducting means, so that thus the influence and control of the vapor-air mixture can be made more direct in accordance with the invention. In the illustration according to FIG. 10, the ventilation system 3 is shown in conjunction with a central ventilation system 62 provided in the area of a passenger ship or the like with a multiplicity of hotplates, wherein these in particular have a plurality of connection lines 3 ', 3 "and at least one outlet 65 This central system has at least one drive 61, which influences the suction power in the lines 3 ', 3 ", in the form of a suction fan or the like.

This drive 61 cooperates via a central control unit 63 with the components provided in the area of the extractor hood 1 for the exhaust air movement such that an optimum combination of central ventilation 62 and the decentralized delivery components of the hood (s) 1 is achieved. In Fig. 10, for example, the connection of connected to a control line 66 to the drive 61 control unit 63 to the control valve 59 (line 67), the fan 51 (line 68) and a differential pressure switch 64 (line 69) is shown.

During operation of this system applied to the central suction system 62, for example, the air pressure in the region of the chamber K is used as a reference variable and this is detected by means of the differential pressure switch 64. As a result of a setpoint comparison provided in the control unit 63, if the delivery pressure in the chamber K is too low, the power in the region of the radial fan 51 can be increased. In the event that the fan 51 has reached a power limit, then the control flap 59 can be controlled and thus the volume of air detected by the central suction 62 can be increased. This interaction of the central and decentralized components can be regulated by appropriate control programs. that optimal extraction conditions in the region of the hood (s) 1 are achieved and thus the energy balance of the overall system is improved. This means that less "heated" air volume is transported away in the region of the connecting line 3 ', the proportions of conditioned air volume in the region of the branch channel 50 are optimally adapted and less fresh air is to be processed in the area of the large kitchen.

The practical implementations of this complex system with a variably adjustable control system have shown that optimum ventilation conditions are achieved in each case and an advantageous energy saving is achieved with regard to the energy balance of such projects - in particular on passenger ships as self-sufficient units with multi-level distributed cooking zones.

Claims

claims

1. Ventilation arrangement with an extractor hood, in particular in the form of a fume hood for the kitchen area, wherein the means of an outlet (2) to a central exhaust (62) acting venting system (3) connectable extractor hood (1) has a housing-like structure and with an upper Ceiling part (4) and each of this angled longitudinal and transverse side parts (5, 6, 7, 8) in the installed position downwardly open vapor receiving chamber (9), from the out water and / or greasy fume via a separator (10) is received in at least one channel (K) and forwarded as largely purified exhaust air (T) to the outlet port (2), said provided as a distribution shaft (11) channel (K) with at least one partial volume (TV) of the filtered exhaust air (T ) is arranged recirculating connection (TR), this opens to the vapor receiving chamber (9) out in the region of at least one transfer chamber (30) and at the outlet of a Str Covering (34) is provided in the direction of flow (TR ") of the recirculated partial volume (TV), characterized in that the extractor hood (1) is provided with at least one branch channel (50.1, 50.2) forming the return connection (TR), such that by means of of the branch channel (50.1, 50.2) a partial volume (TV) of the purified exhaust air (T) from the region of the distribution shaft (11) directly into the vapor receiving chamber (9) can be introduced.

2. Ventilation arrangement according to claim 1, characterized in that the at least one branch channel (50.1, 50.2) is located substantially outside of the mist surface. receiving space (9) between the region of the distribution shaft (11) and the transfer chamber (30) extends.

3. Ventilation arrangement according to claim 1 or 2, characterized in that the branch channel (50.1, 50.2) above the vapor receiving space (9) substantially single-layer limiting and laterally opposite to both the distribution well (11) and with the transfer chamber (30) Ceiling part (4) extends.

4. Ventilation arrangement according to one of claims 1 to 3, characterized in that the branch channel (50.1, 50.2) cooperates with at least one part volume (TV) of the filtered exhaust air (T) separating fan (51).

5. Ventilation arrangement according to one of claims 1 to 4, characterized in that in the region of the transfer chamber (30) provided with a respective fan (51) branch channels (50.1, 50.1 ', 50.2, 50.2', 50.2 ", 50.2 '") open out.

6. Ventilation arrangement according to one of claims 1 to 5, characterized in that from the transfer chamber (30) in the region of the cover (34) executable partial volume (TV) of the filtered exhaust air (T) in a to the ceiling part (4) of the Extractor hood (1) substantially parallel conveying direction (TR ") flows.

7. Ventilation arrangement according to one of claims 1 to 6, characterized in that the from the transfer chamber (30) flowing part volume (TV) for Ab- separator (10) of the distribution shaft (11) towards largely without change in direction is conductive.

8. Ventilation arrangement according to one of claims 1 to 7, characterized in that the transfer chamber (30) in the region of its cover (34) has respective flow nozzles (52).

9. Ventilation arrangement according to one of claims 1 to 8, characterized in that in the region of the fan (51) or the flow nozzles (52) respective ventilation flaps (53) are provided.

10. Ventilation arrangement according to one of claims 1 to 9, characterized in that in one of the ceiling part (4) limited upper portion of the distribution shaft (11) in the branch channel (50.1) opening outlet opening (54) is provided and at a distance (A) to this outlet opening (54) of the outlet (2) to the distribution shaft (11) can be connected.

11. Ventilation arrangement according to claim 10, characterized in that the branch channel (50.1) in the region of the outlet opening (54) with the at least one fan (51) is provided.

12. Ventilation arrangement according to claim 10 or 11, characterized in that the branch channel (50.1) in the form of a plurality of sections (56, 56 ', 56 ") having pipe bend to the transfer chamber (30) is guided.

13. Ventilation arrangement according to one of claims 10 to 12, characterized in that the vapor receiving space (9) directed separator (10) of the distribution shaft (11) defines an adjacent ceiling part (4) acute angled intake position (W).

14. Ventilation arrangement according to claim 13, characterized in that the suction position (W) of the separator (10) is variable.

15. Ventilation arrangement according to one of claims 1 to 9, characterized in that the distribution shaft (11) with a behind the separator (10) located space (K) and expanding with the outlet (2) of the hood (1) connectable hood approach ( 57) is provided and from this at least one branch channel (50.2) is branched off to the transfer chamber (30).

16. Ventilation arrangement according to claim 15, characterized in that at least one fan (51) is provided in the area of the hood extension (57) diverted branch channel (50.2).

17. Ventilation arrangement according to claim 15 or 16, characterized in that the hood projection (57) with a plurality of branch channels (50.2, 50.2 ', 50.2 ", 50.2"') is provided.

18. Ventilation arrangement according to one of claims 15 to 17, characterized in that the hood projection (57) in the region of the outlet opening (58) of the distribution shaft (11) is provided with a control flap (59).

19. Ventilation arrangement according to claim 18, characterized in that the control flap (59) by means of a drive member (60) and / or manually displaceable.

20. Ventilation arrangement according to claim 18 or 19, characterized in that the control flap (59) is infinitely adjustable.

21. Ventilation arrangement according to one of claims 1 to 20, characterized in that the ventilation system (3) to a controllable drive (61) having central ventilation (62) is connected, via a control unit (63) with the at least one fan (51 ), at least one differential pressure switch (64) and the drive member (60) of the at least one control flap (59) cooperates such that at least the exhaust air in the interior (K) of the distribution shaft (11) is adjustable to an optimizable operating pressure.