EP2759711A2 - Air duct device - Google Patents

Abstract

The apparatus has an air duct element (12) comprising a housing (13) in which a device (17) e.g. ventilator (20), is arranged, where gaseous medium flows through the device. An intake nozzle (18) is aligned at a front end (14) of the housing. A discharge nozzle is aligned at another front end (15) of the housing. A front wall (21) comprises an inlet opening (22), and another front wall comprises an outlet opening attached to the discharge nozzle. The inlet and outlet openings form a flow channel with a housing section, where the channel is enclosed by the housing. The ventilator is designed as a diagonal ventilator, radial ventilator or axial ventilator. The housing section is made from plastic, metal sheet or composite material.

Description

The invention relates to an air duct device with an air duct element, in which a device is arranged, which is flowed through by a gaseous medium whose inflow side is aligned to an inlet side of the air duct element and its downstream side to the outlet side of the air duct element.

From the US 2008/0213103 A1 an axial fan is known which can be used for example in a housing, as is known from US 2008/0260517 A1 evident. This housing serves to arrange a plurality of axial fans connected in series. The arrangement of the fans within the housing should be able to be changed in order to change the air flow and the static pressure of the air to be delivered. The US 4,347,665 B2 shows covers for such aforementioned axial fans, if they are installed individually or in the housing.

From the DE 25 29 370 A1 a tubular fan for conveying gaseous media in air ducts is known, in which an air flow which is sucked in the axial direction, is deflected by the fan by 90 ° radially outward, then to redirect the air flow back into an outlet, so that this in axial Direction can flow away again.

From the US Pat. No. 6,450,760 B1 An axial fan is known in which the radially outer blade geometry is adapted to a housing contour or to a fixed cover plate in order to achieve a noise reduction.

Furthermore, it is known to use air duct devices as a replacement of air duct fans, which have in an air duct a fan with backwardly curved vanes, whose axis of rotation is aligned perpendicular to the flow direction in the air duct. In such duct fans, an increased static pressure build-up is possible due to the double deflection of the flow through 90 °. However, regulated in such engines Engines used to meet a standard ERP (Energy Related Products). Such regulated motors are expensive. In addition, these duct fans in conventional design, regardless of the engine technology used on an increased noise emission.

The duct fans, in which, for example, a radial or axial fan is used with the flow axis coaxial with the air duct element and on the inlet side of the air duct element having an end wall with an inlet opening, which merges into the inlet nozzle of the radial and / or axial fan, has with respect to the above Air duct fan on the advantage that the sound emission could be reduced. In addition, non-controllable motors can be used to fulfill the ERP standard. Due to the increasing demands on the reduction of the acoustic emission, it is necessary to further develop such air duct fans.

The invention has for its object to propose an air duct device, wherein in addition an improved acoustic emission is given.

This object is achieved by an air duct device according to the features of claim 1. Further advantageous embodiments and further developments are specified in the further claims.

By the configuration of the air channel device in which both the inlet side and the outlet side of the air channel element comprises an end wall, each having an inlet and outlet opening, wherein the inlet opening in the end face of the air channel element and the outlet opening in the end face of the air channel element with a housing portion arranged therebetween is connected to the device and at least partially forms a flow channel, wherein the flow channel is surrounded by a closed housing or the housing is still completely traversed, resulting in the device sound is not radiated into the air duct element, but passed through the air duct element. In addition, the sound generated via an outer housing portion of the device can be absorbed in the air channel element itself be, since this is formed closed. In any case, the sound is not guided through the air duct element in the environment to the outside, since the flow channel is surrounded by a closed housing. As a result, the air duct device is designed to be at least bivalve with respect to the device for conveying an air stream. In addition, there are no pressure losses in the air duct device. By this arrangement, an increase in the overall efficiency of the device disposed in the housing is achieved.

The device is preferably arranged by means of at least one receiving device or a suspension device, in particular elastic suspension device, at the inlet opening and the outlet opening of the respective end wall of the air channel element. Thereby, the device is arranged levitating in the air duct element, that is, that the device has no additional brackets or fasteners, by means of which the device is attached to one of the side walls of the air duct element. As a result, a sound decoupling can be given to further wall sections of the air duct element. Due to the free-floating arrangement, furthermore, a vibration reduction can also be achieved. Due to the suspended mounting of the device in the air duct element, a two-shell construction can be achieved. An outer shell is formed by the circumferential side walls of the air channel element. An inner shell is formed by a housing or housing portion surrounding the device. As a result, a closed cavity can be created in the air duct element, which represents a sound absorber space.

The elastic receiving device for receiving the device in the air duct element preferably has at least one connecting element, such as a collar, which positions the inlet opening of the end wall and the inlet nozzle of the device and / or the outlet opening of the end wall and the outlet nozzle of the device to each other. This allows a simple connection and installation of the device to the inlet side and / or outlet side of Air channel element allows. In addition, this creates a structurally simple structure.

Alternatively, the connecting element may be provided between the inlet opening and the housing section and the device and / or between the outlet opening and the housing section of the device.

The at least one connecting element of the elastic suspension device is advantageously arranged on the outer side of the inlet nozzle and inlet opening or the inlet opening and the housing section and / or downstream on an outer side of the outlet nozzle and the outlet opening or the outlet opening and the housing section of the device. Thereby, the elastic suspension device for the flow channel of the device can be positioned without interference to allow an elastic suspension of the device to the inlet side and / or outlet side.

The inlet opening on the end wall and the inlet nozzle or the housing section of the device each have a connecting portion, which is outside the flow cross-section of the device and at least partially associated with each other. As a result, a flexible configuration of the at least one connecting element can be made possible in order to position and fix the connecting sections relative to one another and also to design the connecting elements. The same applies to the outlet opening and outlet nozzle or the housing section.

An alternative embodiment of the invention provides that the inlet nozzle and the inlet opening or the inlet opening and the housing portion each have a connecting portion, the inside of which form a portion of the flow channel of the device. As a result, a structurally further simplified embodiment of the air duct device for connecting the device to the inlet opening and outlet opening of the air duct element can be provided. By analogy with the configuration of the inlet opening and inlet nozzle, the outlet opening and outlet nozzle or the outlet nozzle and the Be formed housing portion of the device.

The at least one connecting element of the elastic suspension device is preferably designed as a detachable tensioning or clamping element. This allows a simple and quick installation. As a result, a quick replacement of a device can be made possible. Preferably, such a releasable clamping or clamping elements, a clamping band or a clamp is provided which completely surround the outer periphery of the connecting portions of the inlet opening and the inlet nozzle. The same applies to the outlet side. As an alternative to the releasable clamping or clamping element, a screw connection can also be used as a connecting element, which acts directly on the connecting sections.

An end edge of the inlet opening and an end edge of the inlet nozzle are preferably arranged as a butt joint to each other. The respective end edges lie, for example, directly against each other and form a continuous transition to avoid turbulence at the joint. The same can also be provided on the outlet side.

Alternatively, a damping element may be provided between the front edge of the inlet opening and an end edge of the inlet nozzle. This creates an additional decoupling between the end wall of the air duct device and the device mounted in the housing of the air duct element. An analogous arrangement of the damping element can also be provided between an end edge of the outlet opening and an end face of the outlet nozzle.

A further preferred embodiment of the invention provides that at least one damping element is provided between an outer side of the connecting section of the inlet opening and an outer side of the connecting section of the inlet nozzle and the at least one connecting element acting on the connecting sections. As a result, a further damping effect and sound absorption can be achieved.

A further preferred embodiment of the invention provides a removable inspection cover in the housing of the air duct element in front. As a result, when the air duct element is incorporated into a duct system, a subsequent revision is made possible without the air duct element having to be dismantled with respect to the further air duct elements arranged on the inlet side and outlet side.

A further preferred embodiment of the invention provides at least one insulating element in the housing of the air duct element. This insulating element may extend partially or completely along one or all of the side walls of the housing of the air duct element. Such an insulating element can also fill a cavity formed between the housing and the end walls and the device. The at least one insulating element is preferably provided to prevent cold bridges. As a result, condensation can also be prevented. In addition and / or alternatively, this insulating element can also be used for sound absorption.

The device provided in the air duct device is preferably designed as a fan, in particular a radial or axial fan. This has the advantage that a sound generated by the fan is guided through the flow channel and the radially radiating sound is absorbed in the air channel element.

According to a further advantageous embodiment of the air duct device, the device is designed as a pipe silencer. As a result, an additional noise reduction can be achieved. Such an air duct device with a pipe sound damping can be upstream and / or downstream of an air duct device with a fan. Due to the arrangement of the pipe silencer in an air duct element and the fan in an air duct element, these air duct devices constitute modular units which can be connected to one another in any desired manner and integrated into further air duct elements for an air duct system. The pipe silencer preferably has a pipe diameter, which corresponds to the flow channel, so that a same flow outside diameter are formed, whereby little or almost no pressure losses occur and the overall efficiency can be increased.

The device designed as a pipe silencer can be arranged according to a first embodiment by the receiving device to the inlet nozzle or to the outlet nozzle, as for example for a device designed as a fan according to FIG. 5 is described in more detail. Alternatively, the device designed as a pipe muffler can be attached to the inlet nozzle and / or to the outlet nozzle by means of a plug connection. As a result, the assembly can be further simplified and shortened in time.

The housing section of the device is preferably formed from a metallic strip material, in particular a sheet metal, or from plastic or from a multilayer composite material. Depending on the required sound absorption and / or a cost pressure, the use of the material for the housing portion may be selected with the device.

• Figur 1 eine perspektivische Ansicht von vorne auf die erfindungsgemäße Luftkanaleinrichtung mit einem Ventilator,
• Figur 2 eine perspektivische Rückansicht der Luftkanaleinrichtung gemäß Figur 1,
• Figur 3 einen schematischen Teilschnitt der Luftkanaleinrichtung gemäß Figur 1,
• Figur 4 eine schematisch vergrößerte Ansicht des Details "X" gemäß Figur 3,
• Figur 5 eine schematisch vergrößerte Ansicht des Details "Y" gemäß Figur 3,
• Figur 6 einen schematischen Teilschnitt einer erfindungsgemäßen Luftkanaleinrichtung mit einem Rohrschalldämpfer und
• Figur 7 eine schematisch vergrößerte Ansicht des Details "Z" in Figur 6.

The invention and further advantageous embodiments and developments thereof are described in more detail below with reference to the examples shown in the drawings and explained. The features to be taken from the description and the drawings can be applied individually according to the invention individually or in combination in any combination. Show it:

• FIG. 1 a perspective view from the front of the air duct device according to the invention with a fan,
• FIG. 2 a perspective rear view of the air duct device according to FIG. 1 .
• FIG. 3 a schematic partial section of the air duct device according to FIG. 1 .
• FIG. 4 a schematically enlarged view of the detail "X" according to FIG. 3 .
• FIG. 5 a schematically enlarged view of the detail "Y" according to FIG. 3 .
• FIG. 6 a schematic partial section of an air duct device according to the invention with a pipe muffler and
• FIG. 7 a schematically enlarged view of the detail "Z" in FIG. 6 ,

In FIG. 1 is a perspective view from the front of a first embodiment of an air duct device 11 is shown. The FIG. 2 shows a rear perspective view of the air duct device 11 according to FIG. 1 , The air duct device 11 comprises an air duct element 12, which has a housing 13 with an upstream end face 14 and a downstream end face 15. This housing 13 is formed for example rectangular and has four circumferential and juxtaposed side walls 16. On each end flange elements are provided, which are provided for easy integration into an air duct on a plurality of air channel elements. Alternatively, the air duct element may also have a round housing.

In the housing 13, a device 17 is positioned. This device 17 is a fan in this embodiment and is hereinafter referred to as fan 20. The fan 20 has an inlet opening 18, which is aligned to the upstream end face 14 and an outlet opening 19, which is aligned to the downstream end face 15. The longitudinal axis of the fan 20 lies in the flow direction of a flow through the air channel element 12.

On an upstream end face 14 of the housing 13, an end wall 21 is provided with an inlet opening 22, which is in communication with the inlet nozzle 18 of the fan 20. On the outflow side, a further end wall 23 with an outlet opening 24 is provided on the air channel element 12, which is in communication with an inlet nozzle 19 of the fan 20. By this configuration of the air channel element 12, the housing 13 is completely closed with the exception of a flow channel 25 which extends through the fan 20, which is in communication with the inlet opening 22 and the outlet opening 24.

The fan 20 is arranged by at least one receiving device 26 in the air channel element 12 and positioned to the inlet opening 22 and outlet opening 24 of the end wall 21, 23.

In FIG. 3 is a schematic sectional view of the air channel element 11 is shown. For example, as a fan 20 is a diagonal fan provided, which is described in more detail below. Alternatively, other devices, such as an axial fan or the like, can be used.

The diagonal fan has an outer housing section 27, which in particular comprises a housing jacket and encloses a circular cylindrical straight cylinder interior. The housing portion 27 may consist of a metallic material, in particular sheet metal or a galvanized sheet, or of plastic or of a composite material. The diagonal fan has a diagonal impeller 28, which is associated upstream of a suction unit 29. Downstream of the diagonal impeller is a guide 30 and then formed on the same a diffuser 31 within the diagonal fan. The diffuser 31 is formed by a blow-out unit 32. The guided by Diagonallaufrad 28 through the diagonal fan through the gaseous flow medium flows around a central interior of the diagonal fan, which is delimited inwardly, whereby a support plate 33 of the Diagonallaufrades 28 and an axially adjoining the support plate 33 intermediate sheath 34 is formed. The support plate 33 curves downstream in the axial direction, so that this aerodynamically abuts the axially aligned intermediate jacket 34. The flow medium thus flows radially outward past the support disk 33 and the intermediate casing 34.

The Diagonallaufrad 28 has circumferentially distributed blades 36 which are fixed with its one side to the support plate 33. Opposite have free blade ends 37 of the blades 36 to a peripheral surface 39 of a cover plate 40 which is secured according to the embodiment of the outer blade ends and formed as a rotating cover plate 40. Alternatively, the cover plate 40 may also be attached to the housing portion 27 and is thus fixed. This can preferably be formed integrally with the inlet nozzle 18. The blades 36 are for example profiled in cross-section and wound three-dimensional or profiled in cross-section and twisted, so that the Surfaces are not developed unwound. The downstream inlet edges of the blades 36 are aligned approximately perpendicular to the flow direction of the inflowing flow medium and provided with a fillet. The downstream edge of the blades 36 is also aligned perpendicular to the flow leaving diagonal flow. The cover plate 40 may form a piece of the inlet nozzle 18. Alternatively, the inlet nozzle 18, as shown in the embodiment, be attached to the housing portion 27 and the cover plate 40 engage around or wear, so that a streamlined transition from the suction unit 29 and the guide 30 is given. If the inlet nozzle 18 and the cover plate 40 are each formed separately, results in an intermediate annular gap, which can be sealed by a sealing element. Alternatively, such an annular gap may also be designed as a flow labyrinth.

The flow leaving the diagonal impeller 28 then flows through the region of the guide device 30. In this section of the diagonal fan, stationary guide vanes 45 are arranged distributed circumferentially between the intermediate casing 34 and the housing section 27. Through the guide vanes 45 leaving the helical diagonal direction of the diagonal impeller 28 flow is deflected in an axial flow direction. As well as the blades 36 of the diagonal impeller 28 and the vanes 45 are profiled in the present example case and formed three-dimensional wound. Alternatively, in the blades 26 and / or the vanes 45 could be dispensed with the profiling.

In the formed by the support plate 33 of the diagonal impeller 28 and the intermediate casing 34 of the guide 30 interior 47 is a motor 50 which drives the diagonal impeller 28 by means of a drive shaft 51. The motor 50 is flanged to a motor holder which extends from the intermediate casing 34 into the inner space 47.

Subsequent to the guide 30, the diffuser 31 is downstream educated. The diffuser 31 is structurally realized by a flow-ring channel, which is enlarged downstream, between an engine cover 54 and a housing wall of the blow-out unit 32. The motor cover 54 is fastened by means of a plurality of screws, not shown here, to the intermediate jacket 34 of the guide 30 and closes off the interior 27 downstream.

The support plate 33 of the diagonal impeller 28 may be attached via an adjusting device, not shown, to the motor 50, in particular to the drive shaft, so that the setting of a gap between the free blade ends 37 of the Diagonallaufrades 28 and the peripheral surface 39 of the cover plate 40 is possible.

The receiving device 26 for the arrangement of the fan 20 in the air duct element 12, in particular of the diagonal fan, is described below with reference to FIG FIGS. 4 and 5 shown in more detail, which is a schematically enlarged detail view "X" and detail view "Y" according to FIG. 3 demonstrate.

In FIG. 4 is the schematically enlarged detail view "X" of the receiving device 26 arranged upstream. On the housing portion 27 of the fan 20, a connecting portion 61 is arranged extending in the direction of flow, which is formed by a groove 62 separately from the housing portion 27. The groove 62 and the connecting portion 61 may be integrally formed on the housing portion 27. Furthermore, at the inlet opening 22 of the end wall 21, a connecting section 63 is formed or formed which points in the direction of the connecting section 61 of the housing section 27. By at least one connecting element 65 of the receiving device 27, the connecting portions 61, 63 associated with each other and fixed to each other, which are preferably kept positioned with a distance to form an annular gap to each other. As a result, a vibration isolation can be created.

The connecting element 65 may be formed, for example, as a clamping or tensioning element, in particular as a tensioning strap, which - like this in FIG. 1 is shown - is clamped, for example by a screw, so that the connecting portions 61, 63 are fixed to each other. Between the peripheral end edges 66 of the connecting portions 61, 63, a damping element 67 can be positioned, so that the end edges 66 can be arranged separately from each other under low bias and by the damping element 67 to each other. Furthermore, in addition or alternatively, a damping element 67 may also be provided between the connecting element 65 or the tensioning strap and the respective connecting sections 61, 63, so that a vibration-decoupled reception of the connecting section 61 from the housing section 27 to the connecting section 63 of the end wall 21 is made possible from the fan 20 to the end wall 21 of the air guide element 12. Preferably, a damping element 67 is provided both between the end edges 66 and the connecting portions 61, 63 and between the connecting portions 61, 63 and the connecting element 65. In the embodiment according to FIG. 4 the front edge 66 of the connecting portion 61 is formed, for example, characterized in that at the upstream end of the connecting portion 61, a folded portion of the inlet nozzle 18 engages, via which the inlet nozzle 18 to the connecting portion 61 and housing portion 27 is connected. Instead of this outer encompassing of the connecting portion 61 by the folded edge of the inlet nozzle 18, the folded edge can also be arranged on the inside of the connecting portion 61, so that the end edge of the connecting portion 61 of the end edge 66 of the connecting portion 63 is opposite.

In addition, a ring member may be positioned between the inlet port 22 and the inlet nozzle 18 such that from an entrance edge 58 of the inlet port 22 there is a continuous transition to the curved surface of the inlet nozzle 18. Such a ring element can also be clamped by the connecting element 61 or at the connecting portion 63 and / or the inlet nozzle 18 can be inserted or be fastened.

For easy installation and correct arrangement of the connecting element 65, the circumferential groove 62 is provided, so that an end-face contact of the connecting element 65 is given to the groove 62.

In FIG. 5 is schematically enlarged the detail "Y" shown, which illustrates the inlet-side receiving direction 26 enlarged.

This downstream arranged receiving device 26 and the arrangement and positioning of the connecting portions 61, 63 to each other in principle correspond to the receiving of the fan 20 upstream according to FIG. 4 , Deviating from FIG. 5 is that the inlet nozzle 18 is omitted. Consequently, the end edges 66 of the connecting portions 61, 63 are arranged directly opposite each other. At the in FIG. 5 1, the connecting element 65 of the receiving device 26 is arranged on the outer sides of the connecting sections 61, 63, so that a closed flow surface is formed on an inner side 64 of the flow channel 25. Preferably, the damping element 67 is formed such that it lies between the end edges 66, but does not protrude beyond the end edges 66 inwardly into the flow channel 25 into it.

Alternatively, the connecting portions 61, 63 may additionally have a portion which is bent radially outward with respect to the flow channel 25, so that these two connecting portions are adjacent to each other and can be connected to each other, for example by screw or clamp connections, for example a clamp.

Due to the above-described embodiments in the FIGS. 4 and 5 the device 17 is introduced in a first shell, which is formed by the housing portion 27 and the intake and outflow side provided receiving means 26 which merge into the end face 14 or 15 of the housing 13 of the air duct element 12. By the preferably closed housing 13, which between the inflow-side end face 14 and the outflow-side end face 15 preferably comprises closed side walls 16, a second shell is formed, which surrounds the first inner shell. As a result, a double-shell air duct device 11 is formed, by means of which the sound absorption is increased, since each shell forms an absorption element. Alternatively, one or more shells can be introduced for further noise reduction for the environment.

In the housing 13 of the air duct element 12 may at least partially or partially an insulating 69 may be arranged, as exemplified in FIG. 1 is shown. In particular, the circumferential side walls 16 are lined with such an insulating element 69. This serves to avoid cold spots and the formation of condensation. At the same time, such an insulating element 69 can also be used for further noise reduction.

A side wall 16 is opposite the housing 13 as a revision cover 71 ( FIG. 1 ), for example, by releasable connecting elements 72, removably formed, so that accessibility into the housing interior to the fan 20 even after installation of the air duct element 12 in adjacent thereto and not shown air duct elements is possible.

Due to the configuration of the receiving device 26, the fan 20 can be arranged in the housing 13 of the air channel element 12 in a freely floating manner and be carried via the inlet opening 22 of the upstream end wall 21 and the outlet opening 24 of the downstream end wall 22. Additional brackets that engage the housing portion 27 of the fan 20 and are connected to a side wall 16 of the housing 13 are not required. Due to the design of the receiving device 26 may be given an elastic recording, which leads to vibration reduction and thus serves to reduce noise. In addition, damping elements 67 can be used, which allow a further reduction in noise.

In FIG. 6 a second embodiment of the air duct device 11 according to the invention is shown. This air duct device 11 gives way from the first embodiment according to the FIGS. 1 to 5 to the effect that the device 17 is formed as a pipe silencer 74. The pipe silencer 74 consists of a housing section 27 with preferably a perforated plate, which on the outer circumference, for example, with a silencer element, in particular a glass wool, wrapped and on this a final protective layer, in particular a film having. This is just an exemplary construction for a silencer. Various other suitable structures are also conceivable. With regard to the design of the air duct device 11, the air duct element 12, the receiving device 26 and the integration of the pipe silencer 74 via the receiving device 26 in the air duct element 12 and all other features and embodiments that the FIGS. 1 to 5 are also valid for this pipe silencer 74. In particular, in the embodiment of the pipe silencer 74, the receiving device 26 according to the detail "Y" in FIG. 5 both downstream of its positioning in the air duct element 12 and provided on the inflow side. An alternative embodiment of the receiving device is described below in FIG. 7 described.

The air duct device 11 according to the FIGS. 1 to 5 , which receives a fan 20 and the air duct device 11 according to FIG. 6 , which comprises the pipe silencer 74, preferably have the same connections, so that the air duct devices 11 can be connected to one another in an easy manner to form an air duct. As a result, an air duct device 11 with a pipe silencer 74 can be positioned before and / or after the air duct element 12 with the fan 17. Preferably, the diameter of the pipe silencer 64 is the same size as the housing portion 27 of the fan 20, so that when connecting these two modules, a continuous flow channel is created without any pressure losses.

This embodiment also has the advantage that the air duct elements 12 can be formed as a modular unit, which optionally with a fan 20 or pipe silencer 74th can be equipped.

In FIG. 7 is schematically enlarged the detail "Z" in FIG. 6 shown. This detail shows an alternative embodiment of the receiving device 26 to the FIGS. 4 and 5 , When pipe silencer 74, the downstream end face 15 in analogy to FIG. 5 be constructed, that is, that the downstream end face 15 has an end wall 23 which includes a curved inwardly extending outlet nozzle 19, to which the connecting portion 63 connects. Between the side wall 16 and the connecting portion 63 of the outlet nozzle 19, an end-side end portion of the pipe silencer 74 is inserted, so that a radially peripheral edge portion forms the connecting portion 61 which engages behind the connecting portion 63. By this configuration, a simple and quick installation is possible, since the end wall 63 is merely plugged onto the pipe silencer 74 or vice versa, so that subsequently the end wall 23 with a frame, not shown, or a frame structure releasably connected, in particular screwed, can be. Alternatively, a riveting may be provided.

The above comments on the detail "Z" according to FIG. 7 were discussed only for example at the downstream end face 15. The same applies to the inflow-side end face 14.

The above-described features may be essential to the invention in each case as well as in any combination with each other.

Claims (15)

Air duct device having an air duct element (12), which comprises a housing (13) in which at least one device (17) is flowed through which flows through a gaseous medium whose inlet nozzle (18) to the upstream end side (14) of the housing (13 ) and whose outlet nozzle (19) is aligned with its downstream end face (15) of the housing (13), with an end wall (21) arranged on the upstream end face (14), which has an inlet opening (22) which surrounds the inlet nozzle (18 ) is associated with the device (17), characterized in that on an outflow-side end face (15) of the housing (13) also an end wall (23) is arranged, which has an outlet opening (24), the outlet nozzle (19) of the device (17) is assigned, wherein the inlet opening (22) and the outlet opening (24) with a housing section arranged therebetween (27) of the device (17) at least partially a flow form anal (25) and the flow channel (25) by a closed housing (13) is surrounded. Air duct device according to claim 1, characterized in that the device (17) by means of at least one receiving device (26), in particular elastic receiving device, at the inlet opening (22) of the end wall (21) and the outlet opening (24) of the end wall (23) is arranged , Air duct device according to claim 1, characterized in that the receiving device (26) at least one connecting element (61, 65), which upstream the inlet nozzle (18) and inlet opening (22) or the inlet opening (22) and the housing portion (27) and / / or downstream of the outlet nozzle (19) and the outlet opening (24) or the outlet opening (24) and the housing portion (27) positioned to each other. Air duct device according to claim 3, characterized in that the at least one connecting element (61, 65) upstream of an inlet side of the inlet nozzle (18) and inlet opening (22) or the inlet opening (22) and the housing portion (27) and / or downstream of a Outside of the outlet nozzle (19) and / or outlet opening (24) or the outlet opening (24) and the housing portion (27) is arranged. Air duct device according to one of the preceding claims, characterized in that upstream of the inlet nozzle (18) and inlet opening (22) or the inlet opening (22) and the housing portion (27) and / or downstream the outlet nozzle (19) and outlet opening (24) or Outlet opening (24) and the housing portion (27) each have a connecting portion (61, 63) which lie outside the flow cross-section of the fan (20) and at least partially associated with each other. Air duct device according to claim 1, characterized in that the inlet nozzle (18) and inlet opening (22) and / or the outlet nozzle (19) and outlet opening (24) each have a connecting portion (61, 63) whose inside (64) a portion of the Form flow channel (25) in the housing portion (27) of the fan (20). Air duct device according to claim 3, characterized in that the at least one connecting element (65) as a releasable clamping or clamping element, in particular as a clamping band, or as a screw or clamp element is formed. Air duct device according to claim 6, characterized in that the end edges (66) of the connecting portions (61, 63) of the inlet nozzle (18) and inlet opening (22) and / or the outlet nozzle (19) and outlet opening (24) associated with each other in the manner of a butt joint are. Air duct device according to claim 6, characterized in that between the end edges (66) of the connecting portions (61, 63) upstream of the inlet nozzle (18) and inlet opening (22) or the inlet opening (22) and the housing portion (27) and / or downstream Outlet nozzle (19) and the outlet opening (24) or the outlet opening (24) and the housing portion (27) at least one damping element (67) is provided. Air duct device according to claim 1, characterized in that between an outer side of the connecting portions (61, 63) upstream of the inlet nozzle (18) and the inlet opening (22) or the inlet opening (22) and the housing portion (27) and / or downstream of the outlet nozzle ( 19) and the outlet opening (24) or the outlet opening (24) and the Housing portion (27) in which at least one of the connecting portions (61, 63) engaging the connecting element (65) at least one damping element (67) is provided. Air duct device according to claim 1, characterized in that the housing (13) of the air duct element (12) has a removable inspection cover (71). Air duct device according to claim 1, characterized in that in the housing (13) at least one insulating element (69) is arranged. Air duct device according to claim 1, characterized in that the device (17) as a fan (20), in particular a radial or axial fan or as a pipe silencer is formed. Air duct device according to claim 14, characterized in that the pipe silencer (74) to the inlet nozzle (18) and / or the outlet nozzle (19) with a plug-in connection (76) formed receiving means (26) is arranged. Air duct device according to claim 1, characterized in that the housing portion (27) of the device (17) made of plastic, a sheet metal or a multilayer composite material is formed.

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