EP2864709B1 - Ventilation arrangement with a vapour extraction hood - Google Patents

Description

The invention relates to a ventilation arrangement with an extractor hood provided for extracting vapors according to the preamble of claim 1.

From the DE 10 2010 049 363 A1 A ventilation arrangement with an extractor hood is known, in which exhaust air filtered in the area of a separator is received via a distribution shaft in such a way that a ventilation system that is adjustable to the respective steam load 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 close vicinity of the extractor hood. With an extractor hood according to DE 36 23 210 A1 The vertical air flow in front of the separator is increased by capturing a partial air flow behind the separator and guiding it down into the area of the cooking surface, so that an additional direct delivery jet is introduced into the suction air portion and disadvantageous eddy formation occurs.

Starting from this basic construction with a distribution shaft, a generic extractor hood is known, in which, starting from a distribution shaft containing a UVC system, a return connection that detects a partial volume of the filtered and disinfected exhaust air is integrated into the multi-layer wall of the hood construction ( WO 2012/055504 A1 ), so that a compact structure with variable adjustment options is achieved. The partial volume of the exhaust air irradiated and filtered with UV light in the area behind the separator can be selected can be returned from the distribution shaft or a transfer chamber to the extractor chamber. A mix of fresh air is also provided in this professional hood construction. According to EP 0 401 583 A1 shows a construction that can be used in private kitchens as a ventilation hood with only one fan. In the area of an air treatment chamber, an eddy nozzle on the edge is intended to improve the conveyance of the exhaust air via the blower to a passive exhaust air line. The central "circulating air blower" generates the exhaust air flow, is used for horizontal pressure generation and causes eddy formation at the edges, so that overall only a small amount of exhaust air disposal is possible. With a similar extractor hood according to DE 10 2006 032 477 A it is designed as a cuboid housing, so that a closed filter box is provided for private cooking areas. The only blower of the system interacts directly with the respective separating and filter elements on the output side, so that this blower is disadvantageously exposed to high loads and the filter performance is disadvantageously limited.

A similar construction of a circulation unit is shown in US 4,127,106 A shown, wherein the air is circulated in front of the discharge nozzle by means of a fan. According to US 4,541,409 In a filter box, a supply air duct and an exhaust air duct are combined in parallel, and in the case of circulation according to US 2005/0051159 A1 a vertical air jet is generated in the area of a hob. Also US 2006/0278216 A1 and US 4,438,316 A show respective circulation units.

The invention is concerned with the problem of creating a ventilation arrangement for an extractor hood located on a central ventilation system, in which less Technical effort a module for exhaust air return, which can be used variably in large kitchens in particular, is implemented on the hood system with a low installation height, the kitchen fumes sucked into the fume intake space can be influenced in an optimal flow orientation towards the separator and also in comparison to known extractor hoods with a comparative feature low fresh air supply an overall energy saving is achieved. The invention solves this problem with a ventilation arrangement with an extractor hood according to claim 1. Further advantageous embodiments result from claims 2 to 10.

The ventilation arrangement with an extractor hood connected to a central extraction system is provided with a return connection which, according to the invention, has at least one branch duct as a functional additional part of the system which extends outside the extractor space, which is limited in particular by the ceiling part and the longitudinal and transverse side parts. This is designed as an additional module that can be variably adapted to the construction of the respective hood. With this branch duct, depending on the customer-specific installation conditions on the system - particularly in the area of canteen kitchens on ships connected to a central exhaust system - an optimal influencing and distribution of an exhaust air flow is possible in such a way that with a control and feedback system leading back to the central exhaust system from the extractor hood Control automatic substantial energy savings can be achieved.

The design of the branch duct, which can be implemented in a variable design, provides for a recirculating air system which "divides the exhaust air" to be integrated into the extractor hood. With the branch duct, a partial return of filtered exhaust air also has a targeted influence on the vapors sucked into the fume intake space in front of the separator. At the same time, a flow system is generated with the partial volume of the exhaust air guided via the return connection of the branch duct, with which an unwanted escape of moisture-containing haze into the surroundings of the hood can be avoided.

The recirculating air partial volume fed into the vapor receiving space via the branch duct and a transfer chamber can be controlled and directed in fluidic optimization in such a way that this partial volume diverted from the "heated" exhaust air only flows in the area below the extractor hood near its ceiling portion. This avoids that exhaust air gets into the surrounding space, and at the same time the rising vapor can be deflected in its direction of movement towards the separator in such a way that an air-steam mixture influenced in terms of flow technology is detected in the vapor receiving space and discharged from it.

This partial volume of the exhaust air is conveyed out of the transfer chamber located on one of the side parts by means of a fan, so that in the vicinity of the transfer chamber a negative pressure is effective in the vapor absorption space and the vapors rising from the surrounding space receive a delivery pulse in the direction of the separator opposite the transfer chamber , This makes it clear that the extractor hood can be optimally controlled with a suction-blowing combination in the vicinity of your separator. This partial system of the air and vapor line, which is largely closed with a view to the air circulation circuit described above, is constructed in such a way that "only cleaned" exhaust air from the return connection can be used. This means that the previous blowing in of fresh air can be reduced to a minimum and energy can be saved. At the same time, the recirculated partial volume has an effect on the central extraction system connected to the extractor hood in such a way that its lower extraction power - due to the "recirculated" partial volume - achieves energy savings on the extractor hood of 20% to 60% (based on the total circulated air volume) can be.

The hood system with the external branch duct 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 guaranteed. The direction of flow of the partial volume emerging from the transfer chamber can be optimally set in the area of the fans, so that in the area of the separator, which can be adapted to variable installation conditions, in particular with regard to the inclination of the filter surface, a maximum introduction of vaporous air mixture can be achieved.

The production-technical optimization of the ventilation arrangement provides that the branch duct is advantageous above the one-sided boundary of the fume-receiving space and opposite with the distribution shaft as well ceiling part connected to the transfer chamber. The fan separating the respective partial volume from the filtered exhaust air can be provided at variable positions of the branch duct. In view of the size of the ventilation arrangement, the construction provides that several branch ducts provided with a respective fan open in the area of the transfer chamber.

The partial volume sucked in by means of the fans reaches the transfer chamber having a front cover, wherein the steering is carried out in such a way that the partial volume of the filtered exhaust air can flow with a conveying direction essentially parallel to the ceiling part of the extractor hood. Following this conveying direction, which can be influenced with the cover of the transfer chamber, it is provided that the partial volume, in particular discharged through nozzles, can be conducted to the opposite separator of the distribution shaft largely without changes in direction, for example by avoiding intermediate components as a deflection. It goes without saying that a plurality of flow nozzles are provided as a cover in the area 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 against the conveying direction of the partial volume by means of respective ventilation flaps.

Based on the basic construction WO 2012/055504 A1 It is provided that, according to the invention, an outlet opening which opens into the branch channel is provided in an upper partial region of the distribution shaft delimited by the ceiling part, and the one which interacts with the central suction is spaced apart from this outlet opening Outlet connector can be connected to the distribution shaft. In an advantageously compact design, the branch duct is provided directly with the at least one fan in the region of its outlet opening. Starting from this suction area of the fan, the adjoining branch duct is led to the transfer chamber in the form of a pipe bend having several sections and opens in front of the outlet provided with a cover. Flow nozzles are provided in its area, with which the introduced partial volume of the exhaust air is directed into the extractor space.

It is provided that on the other hand the separator directed towards the fume receiving space in front of the distribution shaft defines a suction position inclined at an acute angle to the adjacent ceiling part. In this way, the flow of "cleaned" exhaust air emerging from the transfer chamber parallel to the ceiling part can be optimally sucked in and directed to the rising vapor. It is provided that the suction position of the inclined separator can also have changed inclination angles in different designs. It is also conceivable that this suction position of the separator can be made adjustable by hand or by means of an actuator - according to the respective delivery capacities of the system.

In a second embodiment, the design of the extractor hood provides that the distribution shaft can be provided with a hood extension that extends the space behind the separator. This hood attachment is placed directly on the outlet connection of the extractor hood and defines the only one outlet of the distribution shaft. The branch channel to the transfer chamber can then be branched off from this hood attachment at a largely variable position. In this case, the fan that can be used to branch off the partial volume of the exhaust air is provided directly in the region of the discharge opening connected to the branch duct at the hood attachment. The fan of this branch duct can advantageously be arranged at the outlet-side end of the branch duct in the region of the transfer chamber, in particular with regard to improved accessibility.

This concept with the hood attachment forming the outlet of the distribution shaft provides that several branch ducts - with appropriate fans - can act in combination on this hood attachment.

For the operation and control of this system with hood attachment, it is provided that this is additionally provided with a control flap in the area of the outlet opening of the distribution shaft. This control flap can be moved by means of a drive element or by hand, so that a closed or open 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 in accordance with the respective suction capacities and thus the air volume to be conveyed is influenced.

The control concept, which can be variably designed on the basis of the central ventilation or suction, provides that the decentralized conveyor components in the extractor hood are controlled by a programmable control unit optimal state of the exhaust air discharge and the partial exhaust air return are adjustable and thus a substantial energy saving in the overall system, in particular a passenger ship with several suction positions, can be achieved.

Fig. 1

eine perspektivische Unteransicht einer ersten Ausführung der erfindungsgemäßen Dunstabzugshaube,

Fig. 2

eine perspektivische Draufsicht der Dunstabzugshaube gemäß Fig. 1,

Fig. 3

eine teilweise geschnittene Seitenansicht der Dunstabzugshaube gemäß einer Linie III-III in Fig. 2,

Fig. 4

eine Draufsicht der Dunstabzugshaube gemäß Fig. 1,

Fig. 5

eine teilweise geschnittene Vorderansicht der Dunstabzugshaube gemäß einer Linie V-V in Fig. 4,

Fig. 6

eine teilweise geschnittene Seitenansicht ähnlich Fig. 3 mit einer zweiten Ausführung der Dunstabzugshaube,

Fig. 7

eine geschnittene Stirnansicht der Dunstabzugshaube gemäß einer Linie VII-VII in Fig. 6,

Fig. 8

eine vergrößerte Ausschnittsdarstellung im Bereich des Haubenansatzes mit einer in Schließstellung befindlichen Steuerklappe,

Fig. 9

eine Ausschnittsdarstellung ähnlich Fig. 8 mit einer Öffnungsstellung der Steuerklappe, und

Fig. 10

eine Seitenansicht ähnlich Fig. 6 mit zusätzlichen Einzelteilen zur Steuerung der an eine Zentrallüftung eines Schiffes o. dgl. Systeme angeschlossenen Haube.

Further details and advantageous refinements of the invention result from the following description and the drawing, in which two exemplary embodiments of the ventilation arrangement according to the invention with return connection are illustrated in more detail. The drawing shows:

Fig. 1

2 shows a perspective bottom view of a first embodiment of the extractor hood according to the invention,

Fig. 2

a top perspective view of the extractor hood according to Fig. 1 .

Fig. 3

a partially sectioned side view of the extractor hood according to a line III-III in Fig. 2 .

Fig. 4

a plan view of the extractor hood according to Fig. 1 .

Fig. 5

a partially sectioned front view of the extractor hood according to a line VV in Fig. 4 .

Fig. 6

a partially sectioned side view similar Fig. 3 with a second version of the extractor hood,

Fig. 7

a sectional end view of the extractor hood according to a line VII-VII in Fig. 6 .

Fig. 8

2 shows an enlarged detail view in the area of the hood attachment with a control flap in the closed position,

Fig. 9

a section view similar Fig. 8 with an open position of the control flap, and

Fig. 10

a side view similar Fig. 6 with additional individual parts for controlling the hood connected to the central ventilation of a ship or similar systems.

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

The extractor hood 1 has a housing-like structure which is known per se and can be connected to a ventilation system 3 by means of an outlet connection 2 or the like. This extractor hood 1 is provided with an upper ceiling part 4 as well as longitudinal and transverse side parts 5, 6 and 7, 8 angled therefrom, so that a fume-receiving space 9 which is open at the bottom in the installed position 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 can be generated in such a way that water and / or fat-containing haze is taken out of the mist receiving space 9 via a separator 10 in a channel generally designated K in the form of a distribution shaft 11 and as largely cleaned exhaust air T (dashed line . Fig. 3 ) is forwarded to the outlet port 2.

The channel K provided as a distribution shaft 11 is provided with at least one return connection TR which detects a partial volume TV of the filtered exhaust air T. This return connection TR opens out to the vapor receiving space 9 in the area of at least one transfer chamber 30. A cover 34 influencing the flow direction TR "of the recirculated partial volume TV 'is provided at its outlet.

The system of the extractor hood 1 according to the invention sees (as in 1 to 9 )), an optimized return connection TR, which has a branch duct 50.1 (which can be connected to the hood plates as an additional assembly) ( Fig. 2 ) or 50.2 ( Fig. 6 ) is provided. With this branch channel 50 one becomes variable customizable additional module provided. This forms a vapor connection space 9 which extends essentially outside of the vapor receiving space 9 and is delimited by the ceiling part 4 or longitudinal and transverse side parts 5, 6, 7, 8 and thereby connects the region of the distribution shaft 11 to the transfer chamber 30. It is thereby achieved that a partial volume TV of the cleaned exhaust air from the area of the distribution shaft 11 is largely conveyed directly into the transfer chamber 30 by means of variable designs of this branch duct 50, which simplifies the known "integrated" hoods. The sub-volume TV 'can be passed on from the transfer chamber 30 into the fume-receiving space 9 in a targeted manner by means of respective guide means.

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

For efficient use of the respective branch duct 50.1 or 50.2, it is provided that they each interact with at least one fan 51 which separates the partial volume TV from the filtered exhaust air T as a guiding means which can be activated. From the sectional views according to Fig. 5 and Fig. 7 it becomes clear that in the area of the respective transfer chambers 30 a plurality of branch channels 50.1 and 50.1 'and 50.2, 50.2', 50.2 "and 50.2"'' provided with respective fans 51 open. This opens up further possibilities for controlling and returning the respective partial volume TV ( Fig. 10 ).

A further optimization in the area of the respective transfer chamber 30 is also connected to this branch channel concept according to the invention. According to the invention, it is provided that the partial volume TV of the filtered exhaust air T which can be discharged from the transfer chamber 30 in the area of its cover 34 flows in a conveying direction substantially according to the ceiling part 4 of the extractor hood 1 (according to TV ') ( Fig. 3 . Fig. 6 ). It is thereby achieved that the partial volume TV 'flowing out of the transfer chamber 30 can reach the separator 10 of the distribution shaft 11 largely without changes in direction. For this purpose, components acting as an obstacle have been removed in this area. An additional improvement of this optimally controllable flow pattern is provided that the transfer chamber 30 is additionally provided with respective flow nozzles 52 in the area of its cover 34.

It is provided in the area of the transfer chamber 30 or its flow nozzles 52 that respective ventilation flaps 53 are arranged here. In this way, unwanted feeding of suction air or the like acting in the system against the conveying direction TV 'into the branch duct 50.1 or 50.2 can be avoided.

The design of the extractor hood 1 according to 1 to 5 is characterized in that in an upper partial area of the distribution shaft 11 delimited by the ceiling part 4 ( Fig. 3 ) an outlet opening 54 opening into the branch duct 50.1 is provided and at a distance A from this outlet opening 54 the known outlet port 2 for the ventilation system 3 can be connected to the distribution shaft 11. In this embodiment of the extractor hood 1, it is provided that the branch duct 50.1 is provided in the area of the outlet opening 54 with the at least one fan 51 such that the partial volume TV is pressed into the interior of the branch duct 50.1 from the latter. It is also conceivable that the branch duct 50.1 in the area of its outlet opening 55 ( Fig. 3 ) to the transfer chamber 30 is provided with the at least one fan 51 (not shown).

From the side view according to Fig. 3 it is also clear that the branch duct 50.1 is led to the transfer chamber 30 in the form of a pipe bend having a plurality of sections 56, 56 ', 56 ".

An optimization of this design with "overhead recirculation" as an additional module is achieved in that the separator 10 of the distribution shaft 11, which is in contact with the longitudinal side 6 and is directed towards the fume receiving space 9 can define a suction position inclined at an acute angle to the adjacent ceiling part 4 with a variable angular position (angle W). This correspondingly "steep" or "flat" predeterminable suction position W of the separator 10 can be designed by means of a support connection (not shown in more detail (at P or P ')) in such a way that the separator 10 can be adjusted. This adjustment of the suction position W can be done by hand or by means of a motor drive (also not shown). For the angular position according to angle W, an inclination in the range from 35 ° to 70 °, preferably 58 °, is 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 '. The UV tube system 35, which is known per se, is visible, with which ozone formation is effected in the area of the distribution shaft 11 directly behind the separator 10, in such a way that, in addition to the antibacterial effect, particles contained in the filtered exhaust air are also broken up and via the suction 3 venting.

From a synopsis of 6 to 9 a second embodiment of the extractor hood 1 with the branch duct generally designated 50.2 becomes clear. The distribution shaft 11 is provided with a hood extension 57 which extends the space K located behind the separator 10 and can be connected to the outlet connection 2 of the extractor hood 1. This hood extension 57 is arranged in such a way that the branch duct 50.2 can be guided from it to the transfer chamber 30 ( Fig. 6 ).

It goes without saying that, in the region of the branch duct 50.2 branched off from the hood extension 57, the at least one fan 51 ( Fig. 6 ) is provided. This can be done as shown ( Fig. 6 ) be connected to the branch duct 50.2 in the region of the transfer chamber 30. It is also conceivable to arrange at least one fan 51 at the other end in the area of the outlet opening 59 of the hood extension 57. In this construction of the extractor hood 1 with the hood extension 57, it is provided that several of the branch channels 50.2 ', 50.2 ", 50.2"''( Fig. 7 ) can be branched into the transfer chamber 30.

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

The above-described system of air guidance with an "external" branch duct 50.1, 50.2 can be carried out in a structurally further simplified manner, for example by the Branch channel is provided with an extension which replaces or depicts the illustrated transfer chamber 30. This extension then has the guide means directed towards the fume-receiving space 9, so that the influencing and control of the vapor-air mixture in the embodiment according to the invention can thus take place more directly.

According to the representation Fig. 10 The ventilation system 3 is shown together with a central ventilation 62 provided in the area of a passenger ship or the like, systems with a large number of hotplates, which in particular has a plurality of connecting lines 3 ', 3 "and at least one outlet 65. This central system has at least one the drive 61 influencing the suction power in the lines 3 ', 3 "in the form of a suction blower or the like.

This drive 61 interacts via a central control unit 63 with the components provided in the area of the extractor hood 1 for moving the exhaust air in such a way that an optimal combination of action of central ventilation 62 and the decentralized conveying components of the hood (s) 1 is achieved. In Fig. 10 For example, the connection of the control unit 63 connected with a control line 66 with the drive 61 to the control flap 59 (line 67), the fan 51 (line 68) and a differential pressure monitor 64 (line 69) is shown.

When this system, which is connected to the central suction 62, is operated, the air pressure in the area of the chamber K is used as a reference variable, for example, and this is detected by means of the differential pressure switch 64. Resulting from one in the Control unit 63 provided setpoint comparison, the output in the region of the radial fan 51 can be increased if the delivery pressure in the chamber K is too low. In the event that the fan 51 has reached a performance limit, the control flap 59 can then be regulated and the air volume detected by the central suction 62 can be increased. This interaction of the central and decentralized components can be regulated by appropriate control programs in such a way that optimal extraction conditions are achieved in the area of the hood (s) 1 and thus the energy balance of the overall system is improved. This means that less "heated" air volume is removed in the area of the connecting line 3 ', the proportions of conditioned air volume in the area of the branch duct 50 are optimally adapted and less fresh air is also to be processed in the area of the commercial kitchen.

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

Claims (10)

1. Ventilation arrangement having a vapour extraction hood, in particular in the form of a fume extractor for the kitchen region of maritime equipment, the vapour extraction hood (1), which is intended to be connected to a ventilation system (3) by means of an outlet connection (2), acting as a central extraction system (62) and, together with an upper ceiling part (4) and longitudinal and transverse side parts (5, 6, 7, 8) angled from said ceiling part in each case, forming a vapour receiving chamber (9) which is open when in the mounted position, the vapour extraction hood further comprising a separator (10), at least one channel (K), a return connection (TR), a transfer chamber (30), a fan (51) and a cover (34), and vapour containing water and/or fat being received in the at least one channel (K) out from the vapour receiving chamber (9) via the separator (10) and being led to the outlet connection (2) as largely cleaned exhaust air (T), the channel (K) that is provided as a distribution shaft (11) being provided with at least one return connection (TR) which encompasses a partial volume (TV) of the filtered exhaust air (T) and flows out to the vapour receiving chamber (9) in the region of at least the transfer chamber (30) with the aid of the fan (51) and the cover (34) being provided on the outlet of said transfer chamber, which cover influences the flow direction (TR") of the recirculated partial volume (TV'), the vapour extraction hood (1) being provided with at least one branch channel (50.1, 50.2) that forms the return connection (TR) and it being possible to convey a partial volume (TV) of the filtered exhaust air (T) directly from the region of the distribution shaft (11) into the vapour receiving chamber (9) by means of the branch channel (50.1, 50.2), the at least one branch channel (50.1, 50.2) extending substantially outside of the vapour receiving chamber (9) between the region of the distribution shaft (11) and the transfer chamber (30), and the fan (51) being provided in the region of the branch channel (50.1, 50.2), characterised in that the partial volume (TV') of the filtered exhaust air (T) that can be led out from the transfer chamber (30) in the region of the cover (34) of said transfer chamber flows in a conveying direction (TR") which is substantially parallel to a ceiling part (4) of the vapour extraction hood (1) such that the partial volume (TV) flowing out of the transfer chamber (30) can be led to the separator (10) of the distribution shaft (11) largely without changing direction, the transfer chamber (30) having respective flow nozzles (52) in the region of the cover (34) of said transfer chamber and in the region of the fan (51) or the flow nozzles (52) being provided with respective ventilation flaps (53), the ventilation flaps (53) being designed for internal flow control such that the fan (51) or the associated flow nozzles (52) can be closed against the conveying direction of the partial volume (TV) by means of the respective ventilation flaps (53).
2. Ventilation arrangement according to claim 1, characterised in that the branch channel (50.1, 50.2) interacts with at least one fan (51) that separates the partial volume (TV) from the filtered exhaust air (T).
3. Ventilation arrangement according to either claim 1 or claim 2, characterised in that a plurality of branch channels (50.1, 50.1'; 50.2, 50.2', 50.2", 50.2''') that are provided with a respective fan (51) merge in the region of the transfer chamber (30).
4. Ventilation arrangement according to any of claims 1 to 3, characterised in that the partial volume (TV') of the filtered exhaust air (T) that can be led out from the transfer chamber (30) in the region of the cover (34) of said transfer chamber flows in a conveying direction (TR") that is substantially parallel to the ceiling part (4) of the vapour extraction hood (1) such that the partial volume (TV) flowing out of the transfer chamber (30) can be led to the separator (10) of the distribution shaft (11) largely without changing direction.
5. Ventilation arrangement according to any of claims 1 to 4, characterised in that the distribution shaft (11) is provided with a hood extension (57) which expands the chamber (K) located behind the separator (10), can be connected to the outlet connection (2) of the vapour extraction hood (1) and from which at least one branch channel (50.2) branches off towards the transfer chamber (30).
6. Ventilation arrangement according to claim 5, characterised in that at least one fan (51) is provided in the region of the branch channel (50.2) that is branched off from the hood extension (57).
7. Ventilation arrangement according to either claim 5 or claim 6, characterised in that the hood extension (57) is provided with a plurality of branch channels (50.2, 50.2', 50.2", 50.2''').
8. Ventilation arrangement according to any of claims 5 to 7, characterised in that the hood extension (57) is provided with a control flap (59) in the region of the outlet opening (58) of the distribution shaft (11) and said control flap (59) can be displaced by means of a drive member (60) and/or by hand.
9. Ventilation arrangement according to claim 8, characterised in that the control flap (59) can be continuously adjusted.
10. Ventilation system with a ventilation arrangement according to any of claims 1 to 9, characterised by a ventilation system (3) that is attached to a central ventilation system (62) as the extraction system, said ventilation system having a controllable drive (61), the central extraction system (62) interacting with the at least one fan (51), at least one differential pressure switch (64) and the drive element (60) of the at least one control flap (59) by means of a control unit (63) such that at least the exhaust air in the interior (K) of the distribution shaft (11) can be adjusted to an operating pressure that can be optimised.

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