EP2587179B1 - Air passage - Google Patents

Description

introduction

The invention relates to an air passage, in particular Stufenquellauslass, with a housing having an inlet cross-section for incoming air and an outlet cross-section for escaping air, wherein the outlet cross-section is at least partially formed by a front plate which is provided with a plurality of apertures, and the inlet cross-section a throttle device, wherein the front plate has at least one edge strip which extends from an associated outer edge of the front plate in the direction of the throttle device.

State of the art

Air outlets of the type described above are well known and are typically used for the purpose of air supply in meeting rooms. Here are in particular such air outlets of high relevance, which are referred to as so-called source outlets. Source outlets are characterized by the fact that an outflow velocity of the air guided through these outlets into a target space is set particularly low. This has the advantage on the one hand that persons who are in the target area are exposed to only low air flow speeds and, on the other hand, that in connection with the introduction of fresh air into the target area, a comparatively low noise level arises, because of the low inflow velocity of the fresh air through the air passage only small flow noises.

In particularly large meeting rooms such as lecture halls, a stepped arrangement of the rows of seats is often provided to improve the acoustics. In this way, listeners sit in a rear area of the auditorium at a much higher level than those seated in a front area of the auditorium. Such spaces often have a correspondingly high height, in particular in the front areas are so high that a full ventilation alone on the ceiling outlets is difficult. Correspondingly, a decentralized ventilation of individual plots of the respective space offers, which provides a uniform distribution of a plurality of air outlets over the room as possible. In particular, the steps of the assembly room are suitable for mounting said air outlets, since each step has a vertically oriented wall section. Such stages are the typical field of application for so-called "step source outlets". These are installed in said wall part of the steps and thus offer the advantage of being able to be placed anywhere on the meeting room and yet always in close proximity to the people in the target area. Changes in the flow control can be felt in this way at very short notice, so that a ventilation system designed by Stufenquellauslässen a meeting room is despite the typically very large volume to be ventilated very flexible and individually applicable.

Prior art step source outlets typically have so-called "flow straighteners" which are capable of rectifying the air flowing from the source outlet and preventing so-called jet necking and acceleration effects. The flow straightener is characterized in particular by an inclined position relative to a flow direction prevailing in the source outlet. This position is typically carried out so that the air flow, which is introduced specifically at Stufenquellauslässen in the immediate vicinity of the floor in the target area, is "raised" from the ground. Especially with Stufenquellauslässen it may otherwise happen that the fresh air leaving the Quellauslass in a purely horizontal direction, remains directly near the ground and - as it is typically cooler than the ambient air - falls down in the next stage and with one there connects from a further Stufenquellauslass effluent air flow, which in turn has only a horizontal orientation. A cascade effect that would be established in this way would lead to a cold draft in the foot area of the persons in the target area, while in the area of the heads of the persons only very little would come from the supply air. By the said lifting of the air flow by means of the flow straightener, on the other hand, ambient air is directly induced and the falling down of the fresh air is prevented.

The known air outlets are also able to dissipate the air stream taken out of them in several directions. This is especially true for round air outlets, but is also known by rectangular devices. However, these known air outlets have the disadvantage that the air flow taken out of them is always set fixed, that is, no change in the outflow directions and / or the individual portions of the volumetric flow, which optionally flow in different directions from the air passage, can be made. However, such adjustability may be useful. This is true, for example, when a meeting room with different occupancy numbers is applied, so that individual flow components should optimally be variably adjustable, both the outflow direction (s) itself and the individual directional components should be changeable.

One way to realize such a variability of the outflow directions of an air passage shows, for example, the German utility model DE 87 10 449 U1 , This describes an air passage, which has a front plate with a circumferential, vertically protruding edge strip which extends in the direction of an interior of the air passage. Like the front plate, the edge strip has openings through which air can escape, with the air emerging from the openings oriented perpendicular to the remaining openings in the front plate flowing out of the air passage parallel to the front plane defined by the front plate. Depending on how far the front panel is inserted in a frame bordering the frame, an effective exit cross section of the openings present in the edge strip is changeable. The larger the effective exit area is chosen, the more the air leaving the air passage is blown out of the air passage in a direction parallel to a front plane of the faceplate.

A disadvantage of this construction has been found that only the proposed means of adjustability of an effective flow cross-section for a aligned parallel to the front panel flow rate is not always sufficient to deflect a sufficiently large proportion of the total air leaving the air passage. Patent document DE20214865U discloses an air passage according to the preamble of claim 1.

task

The present invention is accordingly based on the object to produce an air passage, by means of which a portion of the air passage leaving air, which is oriented parallel to the front panel, in comparison with the prior art is further increased.

solution

The underlying object is achieved on the basis of an air passage of the type described above according to the invention that the at least one edge strip is inclined to the front plane, wherein a plane defined by the edge strip with the front plane an angle between 10 ° and 45 °.

In an edge strip, which is angled in this way from the associated outer edge of the air passage, are - in contrast to the edge strips according to the prior art from the DE 87 10 449 - Typically no breakthroughs provided. This is due to the principle of action of the front edge inclined edge strip: Thus, by the angle of attack of the edge strip relative to the front plate, which moves in the interval mentioned and may assume 40 °, for example, causes a volume flow through the entrance surface in the Air passage enters and flows through the air passage substantially in a direction perpendicular to the front plane, thereby divided into different proportions, that a part of this volume flow strikes the at least one angled edge strip and is deflected by the angle of attack of said flow direction. As a result, this portion further comprises a flow direction, which is no longer oriented perpendicular to the front plane, but has a directional component which is aligned parallel to the front plane. This type of construction of the edge strip is basically conceivable for rectangular as well as for round air outlets.

In principle, it is possible to use an inventive, angled, break-through edge strip with one or more edge strips according to the invention DE 87 10 449 to combine. This means that, for example, an air passage with a rectangular front plate along two of its outer edges may have edge strips that are bent at an angle of 90 ° and, for example, openings in the sense of DE 87 10,449 have, while the other two edge strips include an angle between 10 ° and 45 ° in the context of the present application with the front plane and are typically executed druchbruchsfrei.

Particularly advantageous is such an air passage, wherein the front panel by means of at least one adjustment in a direction perpendicular to a front plane defined by the front plate displaceable and fixable in several positions, wherein in different positions of the front panel, a proportion of a volume flow of the exiting air, the one Direction component has parallel to the front plane, is changeable. In such air passages, in which the position of the front panel is not set at the factory, the front panel is for example firmly welded to the housing, a particularly high degree of flexibility in the adjustability of the air passage leaving the air passage can be achieved. The bending of the edge strip in the manner described is fundamentally independent of the functionality of the adjustability of the respective portion flowing parallel to the front plane. For example, if a parallel to the front plane flowing air flow to be completely undesirable, the front panel can be set with an adjustable air passage, for example in such a position in which deflected at the angled edge strip flow component again "back", that is aligned again perpendicular to the front plane. Alternatively, it is also conceivable that by means of the fixed position of the front panel is achieved that the respective deflected flow component is blocked and can not leave the air passage. In contrast, in order to increase the proportion of flow parallel to the front plate, the front plate can be fixed, for example, in such a position in which the flow component deflected by means of the angled edge strip can exit unhindered from the air passage.

As a result of the bending of the edge strip according to the invention, a significantly larger proportion of the air flowing through the air passage can be deflected, since the air flowing through the air passage is not - as in the prior art - merely given the possibility of moving in a different direction Leaving the air passage perpendicular to the front plane, but the air is "forced" by the angled edge strip to change their direction of flow.

By a length of the edge strip, this proportion is also adjustable: the further the edge strip so to speak "into the air flow" protrudes, that extends inside the air passage, the greater the proportion of the total air flow, which hits him and it is distracted. In the prior art, however, a maximum possible proportion, which flows parallel to the front plane, has already been reached as soon as the openings in the side edges are completely released. Such a length of the edge strip measured by the respectively associated outer edge of the front plate, which is between 20% and 60% of a height of the front plate of the air passage, is particularly advantageous.

In connection with the adjustability of the deflected portion of the total air flow, it may be particularly advantageous to arrange the edge strip pivotally on the front panel, so that the angle between the front plane and the plane defined by the edge strip is flexibly adjustable. It is generally true that the proportion of the air flow, which has a direction parallel to the front plane direction component, the greater, the smaller the angle of attack between the angled edge strip and the front plane is selected.

The deflecting effect of the angled edge strips becomes clear in particular from the exemplary embodiments.

As further particularly advantageous is such an air passage, whose front plate is infinitely adjustable by means of the adjusting device. In this way, a precisely desired adjustment of the proportion of the volume flow, which has a directional component which is oriented parallel to the front plane, particularly simple vornehmbar, since the user is not bound to discrete positions of the front panel.

Such a stepless adjustability of the front panel is particularly easy to reach by means of at least one fastening tab arranged on the housing, which respectively corresponds to a fastening tab arranged on the front panel, preferably on the at least one edge trim, wherein the fastening tabs each have at least one threaded section and the corresponding fastening straps by means of engaging with the threaded sections Threaded bolt are connected together. By means of such adjusting relative positioning of the front panel to the housing is individually adjustable by the user by simply rotating the at least one threaded bolt can change a distance between the corresponding mounting tabs. A number of advantageously provided fastening straps and consequently the threaded bolt to be provided depends, on the one hand, on the geometry of the respective air passage and, on the other hand, on a type of guidance of the front panel on the housing of the air passage. Thus, in the case of a round air passage, for example, a central adjustment device is particularly advantageous, while a rectangular air passage should typically be held with at least two threaded bolts, optionally four threaded bolts.

Such edge strips, which include an angle of 90 ° with the front plane, can assume a guiding function for the front panel. This is done in that the edge strips have a length such that they lie even in an extended position, in which the front plate is completely displaced out of the housing, with an end region still on an inner wall of the housing of the air passage. In this way it is ensured that the at least one edge strip is in constant contact with the housing and thus forces between the front panel and the housing can be transmitted directly over the edge strip. Such a telescopic guide of the front panel in particular prevents tilting of the same and relieves the adjustment.

In a particularly advantageous embodiment of the air passage according to the invention, a gap is arranged between at least one outer edge of the front plate and an inner side of a wall of the housing, whose width is between 0.5 mm and 5.0 mm, preferably between 1.0 mm and 3.0 mm , is. Essentially, this gap fulfills the task that a volumetric flow leaving the air passage also has a directional component which is aligned parallel to the front plane, when the front plate is still completely inside the housing of the air passage, that is, does not project forward out of the housing and thus completes completely flush with a frame of the air passage (retraction position). In this configuration, the volumetric flow passing through the air passage meets the at least one inclined edge strip as described above, is then deflected therefrom and can be deflected by the said gap of the air passage, which is arranged between the outer edge of the front panel and the inner wall of the housing, pass through and leave the air passage. If such a gap is not provided, a deflection of a proportion of the volume flow by means of the inclined edge strips can only take place if the front plate is already displaced to a certain extent from the housing of the air passage, since the front panel otherwise with the frame of the housing Air outlet forms a quasi-sealing contact, which prevents the escape of air from the air passage. In a variant of the air passage, in which the frontebenenparallele proportion of the air flow should be completely off, a similar design, which has no gap, to be preferred accordingly.

In the course of the displacement of the front panel out of the housing said gap is automatically increased, since the distance between the outer edge of the front panel and the inner wall of the housing increases. This leads to two effects: On the one hand, the proportion of the volume flow which emerges from the air passage via the edge strips is increased, since an area ratio between the gap and the "normal" exit area in the form of the perforated front panel is changed, in particular increased. On the other hand, the displacement of the front panel out of the housing leads to a deflection of the portion of the volume flow striking an edge strip being changed in such a way that a directional component parallel to the front plane is increased. This is due to the fact that a proportion of the volume flow deflected by means of an edge strip can flow freely when the front plate is moved far out of the housing and, in particular, does not hit against the wall of the housing. The latter is inevitably the case when the front plate is completely retracted into the housing of the air outlet.

Alternatively, a variant of the air passage according to the invention is also conceivable in which a height and / or a width of the front panel is greater than a respectively associated height or width enclosed by a circumferential frame of the air passage air outlet level of the air passage, so that the front panel with at least one outer edge viewed from the air outlet level protrudes beyond the frame of the air passage. Under the air outlet level is that level to understand that forms a spatial conclusion of the air passage. The air outlet plane is typically bordered by the frame of the housing of the air passage.

In other words, in this embodiment of the air passage, the front panel is simply "larger" designed as the associated air outlet level, so that it would not be possible to "push" the front plate in the air passage, that is to bring them to their retracted position, since the front panel is not would fit into the air passage.

This "protrusion" or "overlapping" of the air outlet plane through the front panel has been able to achieve particularly good results in terms of the outflow characteristic of the air leaving the air passage in experiments. A further improvement, depending on the geometric conditions used, can be achieved by virtue of the fact that the outer edges of the front plate, from which the edge strips are folded, are rounded below a certain bending diameter, that is to say they do not form a "pointed" tapering edge. This can be seen in particular from the following embodiments. A bending radius is advantageously in a range between 1 mm and 10 mm.

In general, it may be advantageous if at least one edge strip sealingly abuts an inner side of a wall of the housing, that is, the air can not leave the air passage along this edge strip. This is especially true when a user wants to configure the air passage so that, where appropriate, possible diversions and distributions of the volume flow in several directions are not desired and in the case of the second alternative with the inclined edge strips the same by a tight fit in the housing so to speak "disabled" should be. This means that it is to be ensured that no portion of the air volume flow can strike the angled surface of the edge strip and is therefore not deflected.

The air passage according to the invention is advantageously formed so that the housing is designed in the form of a frame, which is provided with an edge flange which is substantially flush with the front plane. By the "substantially existing alignment" between the frame and the front panel is to be understood that a displacement of the front panel or the front plane, which always coincides with the viewing surface of the front panel is neglected relative to the housing and continuously the frame and the front plane always be described as aligned.

An adjustment range within which the front plate can be displaced in the direction perpendicular to the front plane should be between 2 mm and 10 mm, preferably between 3 mm and 7 mm. Such an adjustment range is typically sufficient to be able to generate a respective desired volume flow with a direction component parallel to the front plane.

embodiments

The air passage according to the invention will be explained in more detail using an exemplary embodiment which is illustrated in the figures.

Fig. 1:

Eine Skizze eines ersten erfindungsgemäßen Luftdurchlasses

Fig. 2:

Eine Skizze eines zweiten erfindungsgemäßen Luftdurchlasses,

Fig. 3:

Eine isometrische Ansicht des zweiten Luftdurchlasses,

Fig. 4:

Einen horizontalen Schnitt durch den zweiten Luftdurchlass,

Fig. 5:

Ein Detail einer Verstelleinrichtung des zweiten Luftdurchlasses und

Fig. 6a bis 6c:

Alternative Ausführungsvarianten für Frontplatten eines erfindungsgemäßen Luftdurchlasses.

It shows:

Fig. 1:

A sketch of a first inventive air passage

Fig. 2:

A sketch of a second air passage according to the invention,

3:

An isometric view of the second air passage,

4:

A horizontal section through the second air passage,

Fig. 5:

A detail of an adjustment of the second air passage and

6a to 6c:

Alternative embodiments for front panels of an air passage according to the invention.

The embodiment that is in FIG. 1 is shown schematically shows a first inventive rectangular air passage 1, which has an inlet cross-section, not shown for incoming air and an outlet cross-section for escaping air, wherein the outlet cross-section of a rectangular front plate 2 is formed, which has a plurality of openings 3 in the form of round holes , A Perforationsanteil the front panel 2 is here about 30%. The front panel 2 of the air passage 1 has a peripheral outer edge 4, wherein, starting from an upper and a lower portion of the outer edge 4, edge strips 5 'according to the invention extend in the direction of the inlet cross-section of the air passage 1. In the example shown, the front panel 2 has no lateral edge strips. One by the edge strips 5 ' defined plane closes with a defined by the front panel 2 front plane 7 according to the invention an angle α of 40 °. The front panel 2 is connected by means of an adjusting device 14 with a housing 6 of the air passage 6. This adjusting device 14 will be described later in detail with reference to FIGS. 4 and 5 explained. It serves to be able to adjust the front plate 2 continuously in the direction of a longitudinal axis 8 of the air passage 8.

From the example according to FIG. 1 the effect of the invention "oblique position" of the edge strips 5 'is clear: A proportion of the air passage 1 flowing through the air flow, which is illustrated here by arrows 11, is already deflected by means of the edge strip 5' before it to the front plate 2 and push forward through there the openings 3 can escape from the air passage 1. This proportion of the air flow is thus "intercepted" and deflected so that it receives a directional component which is parallel to the front plane 7 of the front panel 2, so to speak, before the otherwise usual exit from the air passage 1 through the openings 3. This distinguishes the air passage 1 according to the invention from other known prior art air passages, which have only lateral openings that allow the air to flow in a direction other than through openings in the front panel from the respective air passage. On the other hand, by means of the edge strips 5 'according to the invention another flow direction is "forced" on and thereby a proportion of the air flow which has a directional component parallel to the front plane 7 increases.

By means of an adjustment of the front plate 2 in the form of a change in its position relative to the housing 6 of the air passage 1, this proportion of the air flow, which is deflected by means of the edge strips 5 ', also be changed. The further the front panel 2 is displaced out of the housing 6 of the air passage 1, the more "free" the deflected portion can flow out of the air passage 1, since a change in direction which it experiences is less blocked by the housing 6 of the air passage 1.

This is particularly clear when one considers a retracted position of the front panel 2: In the retracted position, in which the front panel 2 is maximally retracted into the housing 6 of the air passage 1, the front plane 2 of the front panel 2 is flush with a frame 9 of the housing 6 , That means that the proportion of the air flow, by means of the edge strips 5 'is deflected, within the housing 6 meets the edge strips 5' and is deflected by these substantially in a direction parallel to the front plane 7 direction. However, since the air flow is still within the housing 6 for the time being, it can not yet flow out of the housing 6, but strikes an inner wall of the housing 6, in the example shown corresponding to an upper or a lower inner wall. This causes at least a large part of this previously deflected portion of the air flow is deflected again and flows again substantially perpendicular to the front plane 7. A portion of the air flow, which ultimately leaves the air passage 1 with a front plane parallel direction component is correspondingly low, possibly even zero (the latter is especially true if no gap between the front panel 2 and the frame 9 of the housing 6 is provided).

The front panel 2 is dimensioned so that at the upper and the lower part of the outer edge 4 regardless of a position of the front panel 2 always a gap 13 between the frame 9 of the housing 6 and the front panel 2 remains. This gap 13 makes it possible that even in the described retraction position of the front plate 2 there is the possibility that the air flow leaving the air passage 1 has at least a small proportion of a directional component which is oriented parallel to the front plane 7.

In a further embodiment, the in FIG. 2 is shown, an air passage 1 'shown there in addition to two edge strips 5' according to the invention also has two lateral edge strips 5. These are each oriented so that a plane formed by the respective edge strips 5 with the front plane 7 each encloses an angle of about 90 °, while the remaining two edge strips 5 ', which are arranged at an upper part and a lower part of the outer edge 4 , According to the invention with the front plane 7 an angle α of 40 °.

The edge strips 5 each have four openings 10, which have a rectangular cross-section. Such an embodiment of the edge strips 5 is known from the prior art. The edge strips 5 ', however, are executed free of openings.

The front panel 2 is connected to the housing 6 of the air passage 1 'by means of an in FIG. 2 not shown adjusting device 14 is connected, said adjusting device 14 by two also in FIG. 2 not shown threaded bolt 17 is formed, which engage respectively with corresponding fastening tabs 15, 16 on a housing 6 of the air passage 1 'and the front panel 2. A detailed illustration is the FIGS. 4 and 5 removable. By means of this adjusting device 14, the front panel 2 is displaceable relative to the housing 6, wherein a position of the front panel 2 in a direction parallel to the longitudinal axis 8 of the housing 6 can be changed. By means of the adjusting device 14, the front plate 2 is infinitely adjustable between two extreme positions, the above-mentioned retracted position and an extended position, the front panel 2 in the retracted position exactly flush with the frame 9 of the housing 6 and in the extended position to a maximum degree protrudes from the housing 6. In FIG. 2 the front panel 2 is shown in an intermediate position, which can be seen in particular in the partially released cross sections of the apertures 10 in the edge strip 5. In the retracted position of the front panel 2, these would be completely blocked by the housing, while they would be fully released in the extended position of the front panel 2.

The front panel 2 is displaced in the example shown by 5 mm from the housing 6 out. The edge strips 5 of the air passage 1 'extend into the housing 6 of the air passage 1' in and also have a parallel to the longitudinal axis 8 measured length of about 30% of a height of the front panel 2. In this way, the front panel 2 can be guided even in its extended position by means of the edge strips 5 in the housing 6 and forward 5 forces on the housing 6 via the edge strips. By contrast, the edge strips 5 'which are angled in accordance with the invention are not suitable for contributing to guiding the front panel 2 in the housing 6, since they have no contact with the housing 6.

In the intermediate position of the front panel 2 shown, a continuous air flow conducted through the entry surface into the air passage 1 'is, as it were, fanned out, that is to say that a major portion of the air flow is delivered through the apertures 3 of the front panel 2 to a target space, while further portions are respectively delivered by either the openings 10 of the lateral edge strips 5 or else flow over the angled edge strips 5 'along the upper and the lower outer edge 4 of the front panel 2 into the target space.

In the course of a passage of said portions of the air flow through the openings 10 of the lateral edge strips 5, these portions are deflected by a substantially parallel to the longitudinal axis 8 of the housing 6 main flow direction of the air flow, that they each receive a direction parallel to the front plane 7 direction component. As described above, by displacing the faceplate 2 in a direction facing the housing 6, an effective exit area of the apertures 10 can be varied so that, in consequence of the air passage 1 ', a portion of the airflow laterally parallel to the frontal plane 2 flows out, is changeable and can be completely reduced to zero, for example, by a transfer of the front panel 2 in the retracted position.

The edge strips 5 'according to the invention have no apertures 10. While the apertures 10 cause a deflection of the air flow in the lateral direction relative to a flow direction within the air passage 1 ', this is achieved using the edge strips 5' solely by an angle of attack thereof. Thus, the edge strips 5 'cause a portion of a uniform, flowing in the housing 6 of the air passage 1' air flow on a respective angled edge strip 5 'and is deflected due to its inclination, so that it is parallel to the front plane 7 direction component receives. Such a deflection process is by means of arrows 11 in FIG. 2 graphically illustrated.

The front panel 2 of the air passage 1 'is dimensioned so that even in its retracted position, a gap 13 in each case between the upper outer edge 4 and the wall 12 and the lower outer edge 4 and the wall 12 of the housing 6 remains. The further, finally, the front panel 2 is moved out of the housing 6, the larger the gap 13 and a larger proportion of the air flow in the air passage 1 'is the air passage 1' on the edge strip 5 'and finally the column 13 in the direction leave the target area. Similarly, in such a movement of the front panel 2, a larger area of the openings 10 of the lateral edge strips 5 of the air passage 1 'is released, through which also a portion of the air flow exits. Accordingly, by means of the air passage 1 'according to the invention a proportion of the air flow, which has a directional component parallel to the front plane 7, changeable, in particular by a displacement of the front panel 2 from the retraction position can be increased.

In addition to a mere increase in the proportion of the air flow emerging from the air passage 1 'on the edge strips 5, 5', by the displacement of the front panel 2 also a degree of deflection of that portion is variable, via the edge strip 5 'from the air passage. 1 ' exit. This is justified by the fact that with a front plate 2 extended even further out of the housing 6 of the air passage 1 ', a portion of the air flow deflected on the edge strip 5' bounces less against an inner wall 12 of the housing 6 and thereby again into one oriented rather perpendicular to the front panel 2 oriented direction. By displacing the front plate 2 in a direction facing away from the housing 6, not only the size of the portion of the air flow deflected over the edge strips 5 'can be adjusted, but also the proportion of the directional component oriented parallel to the front plane 7.

In FIG. 3 is a further view of the air passage 1 'according to the invention shown, in particular, the gap 13 is clearly visible.

In the FIGS. 4 and 5 For the air passage 1 'explained above, a section and a detail are respectively shown, in which FIG. 3 a horizontal section through the air passage 1 'and in FIG. 4 a detail of the adjusting device 14 can be seen.

In the example shown, this adjusting device 14 is formed in each case from two corresponding fastening straps 15, 16 and a threaded bolt 17, wherein the fastening strap 15 is frictionally connected with the housing 6 of the air passage 1 'and the fastening strap 16 with an associated edge strip 5 of the front plate 2. The fastening tabs 15, 16 each have holes 18, which are each provided with a threaded portion. In this way, the threaded bolt 17 can frictionally engage with the fastening tabs 15, 16, so that 17, a change in position of the front panel 2 can be effected by rotating the individual threaded bolt. Thus, the front panel 2 is continuously movable between a retracted position and an extended position.

The fastening tab 15 is connected in force-transmitting manner with the housing 6 of the air passage 1 ', in particular screwed or welded. In the present For example, the frame 9 of the air passage 1 'is formed of the same plate 19 as the attachment tab 15, the plate 19 having an L-shape. Alternatively, it would also be conceivable to edge a sheet metal of the housing 6 along an outer edge and in this way to form the frame 9.

In particular, from the detail FIG. 5 It is clear that the air passage 1 'is provided only along an upper and a lower side with an edge strip 5', while on each of a left and on a right side edge strip 5 is arranged. The arrangement of edge strips 5 along the lateral edges is particularly advantageous because they can be used for the above-described "guide" for the front panel 2 and thus significantly improve the stability of the front panel 2, since external force effects by means of the lateral edge strips 5 very can be easily removed to the housing 6 of the air passage 1 '. The risk of tilting of the front panel 2 and / or bending of the threaded bolt 17 or the fastening tabs 15, 16 is thus considerably reduced. However, such an air passage, which along each of the four outer edges of the respective front plate in each case has an edge strip which is inclined at an angle α between 10 ° and 45 ° relative to the front plate, is likewise conceivable without further ado.

In the FIGS. 6a to 6c Finally, different variants of front panels 2 ', 2 ", 2'" of an air passage 1 according to the invention "are shown FIG. 6a As shown, a front panel 2 'has a height exactly matching a height of an air outlet plane 20 of the air outlet 1 ", that is, the front panel 2' is disposed at its upper outer edge 4 at the same height level as the frame 9 of the air passage 1 ", so that - the front panel 2 'would be transferred to its retracted position - the outer edge 4 would abut almost quasi-sealing on the frame 9. The edge strip 5 'of the front panel 2' is bent at an angle α of 40 ° sharp.

In FIG. 6b is such a front panel 2 "shown, whose height is less than the height of the air outlet plane 20. This has the consequence that between the outer edge 4 of the front plate 2 shown" and the frame 9 of the housing 6 of the air passage 1 "is always a gap 13th remains, regardless of the position in which the front panel 2 "is located. This means that a proportion of the air leaving the air passage 2 ", one to the front plane 7 of the Faceplate 2 "parallel direction component, can not be completely reduced to zero, even if the front panel 2" would be transferred to its retracted position. However, the front panel 2 "could possibly be moved so far into the housing 6 of the air passage 1" that already by means of the edge strip 5 'deflected air against the inside of the wall 12 of the air passage 1 "bounces and consequently - at least in part - again is deflected in a direction perpendicular to the front plane 7.

In FIG. 6c is a further variant of a front panel 2 '"shown, whose height exceeds the height of the air outlet level 20 of the air passage 1". That is, the front panel 2 '"can not be transferred to a retracting position as defined above, because an upper part of the front panel 2"' including, inter alia, the upper outer edge 4 'would abut against the frame 9 of the air passage 1 " , the front panel 2 '"should be moved to its retracted position. Consequently, in this variant as well, a flow fraction of the air which leaves the air passage 1 "with a front plane-parallel component can not be completely reduced to zero.

In contrast to the front panels 2 ', 2 "according to the Figures 6a and 6b is the outer edge 4 'of the front panel 2'"executed rounded, here is a radius of curvature of 4 mm.

LIST OF REFERENCE NUMBERS

1, 1 ', 1 "

Air passage

2, 2 ', 2 ", 2"'

front panel

3

breakthrough

4, 4 '

outer edge

5, 5 '

edge strips

6

casing

7

front plane

8th

longitudinal axis

9

frame

10

breakthrough

11

arrow

12

wall

13

gap

14

adjustment

15

mounting tab

16

mounting tab

17

threaded bolt

18

drilling

19

sheet

20

Air exit plane

α

angle

Claims (15)

1. An air duct (1, 1', 1"), particularly a stepped displacement outlet, having a housing (6), which has an inlet cross section for entering air and an outlet cross section for exiting air, the outlet cross section being formed at least to some extent by a front plate (2, 2', 2", 2"'), which is provided with a plurality of holes (3), and the inlet cross section has a throttling device, the front plate (2, 2', 2", 2"') having at least one angled edge strip (5, 5'), which extends in the direction of the throttling device starting from an assigned outer edge (4, 4') of the front plate (2, 2', 2", 2"'), characterized in that the at least one edge strip (5') runs inclined with respect to the front plane (7), wherein a plane defined by the edge strip (5') encloses an angle (α) of between 10° and 45° with the front plane (7).
2. The air duct (1, 1', 1") according to Claim 1, characterized in that the front plate (2, 2', 2'', 2"') can be displaced by means of an adjustment apparatus (14) in a direction perpendicular to a front plane (7) defined by the front plate (2, 2', 2", 2''') and can be fixed in a plurality of positions, wherein a portion of a volumetric flow of the exiting air, which has a directional component parallel to the front plane (7), can be changed in different positions of the front plate (2, 2', 2", 2"').
3. The air duct (1, 1', 1") according to Claim 1 or 2, characterized in that by displacing the front plate (2, 2', 2", 2"') in a direction facing away from the housing (6), the portion of the volumetric flow of the exiting air, which has a directional component parallel to the front plane (7), can be increased.
4. The air duct (1, 1') according to one of Claims 1 to 3, characterized in that the angle (α) between the front plane (7) and the plane defined by the edge strip (5') can be changed, preferably the edge strip (5') can be pivoted relatively to the front plate (2).
5. The air duct (1') according to one of Claims 1 to 4, characterized by at least one edge strip (5), which is orientated in such a manner relatively to the front plate (2), that a plane defined by the edge strip (5) encloses an angle of approximately 90° with the front plane (7).
6. The air duct (1') according to Claim 5, characterized in that the at least one edge strip (5) orientated at the angle of approximately 90° to the front plate (2) has at least one hole (10), preferably in the form of an elongate slot running parallel to the edge strip (5) .
7. The air duct (1') according to one of Claims 1 to 6, characterized in that at least one edge strip (5, 5') bears in a sealing manner against an inner side of a wall (12) of the housing (6).
8. The air duct (1, 1', 1") according to one of Claims 1 to 7, characterized in that a gap (13) is located between at least one outer edge (4) and an inner side of a wall (12) of the housing (6), the width of which gap is between 0.5 mm and 5.0 mm, preferably between 1.0 mm and 3.0 mm.
9. The air duct (1, 1', 1") according to one of Claims 1 to 8, characterized in that the front plate (2, 2', 2" , 2"') can be displaced in the direction perpendicular to the front plane (7) in a displacement range of from 2 mm to 10 mm, preferably 3 mm to 7 mm.
10. The air duct (1, 1', 1") according to one of Claims 1 to 9, characterized in that a displacement of the front plate (2, 2', 2", 2"') can be undertaken in an infinitely variable manner by means of the adjustment apparatus (14).
11. The air duct (1, 1', 1") according to one of Claims 1 to 10, characterized by at least one fastening tab (15) arranged on the housing (6), which corresponds to a fastening tab (16) arranged on the front plate (2, 2', 2", 2"'), preferably on the at least one edge strip (5, 5'), wherein the fastening tabs (15, 16) in each case have at least one threaded section and corresponding fastening tabs (15, 16) are connected to one another by means of a threaded bolt (17) engaging with the threaded sections.
12. The air duct (1, 1', 1") according to Claim 11, characterized in that both the housing (6) and the front plate (2, 2', 2", 2"') have in each case two, preferably in each case four, fastening tabs (15, 16).
13. The air duct (1") according to one of Claims 1 to 12, characterized in that a height and/or a width of the front plate (2"') is larger than a respectively associated height or width of an air outlet plane (20) of the air duct (1") enclosed by a surrounding frame (9) of the air duct (1"), wherein at least one outer edge (4') of the front plate (2"') protrudes beyond the frame (9) of the air outlet (1") as viewed from the air outlet plane (20).
14. The air duct (1, 1', 1") according to one of Claims 1 to 13, characterized in that a length of a respective edge strip (5') measured perpendicularly to the outer edge (4, 4') is between 20% and 60% of a height of the front plate (2, 2', 2", 2"') of the air duct (1, 1', 1").
15. The air duct (1") according to one of Claims 1 to 14, characterized in that the outer edge (4') of the front plate (2"') is finished in a rounded manner and preferably has a radius of curvature of between 1 mm and 10 mm.

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