Patent Publication Number: US-2016236541-A1

Title: Air vent

Description:
The present invention relates to an air vent comprising a housing with an air outlet opening, an air supply channel and a continuous flow channel. Air vents of that kind are used, for example, in motor vehicles for the supply of air and for setting the direction of the outflowing air as well as the amount of the outflowing air. 
     Conventional air vents have not only vertically extending, but also horizontally extending slats, which are arranged in a flow channel. These slats can be pivoted both vertically and horizontally by way of a device so as to influence the direction of the outflowing air. Air vents of that kind usually have a rectangular or round cross-section. 
     In addition, air vents with a substantially round cross-section are known. These can similarly have slats, wherein the slats are often mounted in a ring and the direction of the outflowing air is produced by rotation of the ring and pivotation of the slats mounted therein. 
     Moreover, air vents are known from the prior art which comprise means forming a separation edge for an air flow. DE 10 2010 049 110 A1 discloses an air distributing device for a motor vehicle. The air distributing device has an air outflow opening and an air guide element, by way of which the air outflow direction of an air jet issuing from this air outflow opening can be changed. The air guide element is periodically pivotably movable by way of drive elements, wherein the air guide element is constructed as an inner component of the air guide device. The air guide device additionally has a baffle wall, which is opposite a blocking flap in the flow cross-section of the air channel and is arranged to be displaced in flow direction upstream with respect to the blocking flap. The lateral deflection, which is produced by the opened blocking flap, of an air jet is assisted by a vacuum arising in the downstream region of this baffle wall. 
     DE 100 63 189 B4 discloses a ventilating device with a channel which is flowed through by air in one direction and which has an air outlet opening and—within the channel—controllable air guide elements, which are opposite one another in paired arrangement, for deflection of the air flow. A first air guide element for deflection of the air flow is formed in direction away from the channel wall and a second air guide element, which is opposite the first air guide element, for deflecting the air flow is formed in direction towards the channel wall. The air guide elements in the channel wall are mounted to adjoin the channel wall and the second air guide element is constructed for deflection of the air flow on the basis of Coanda effect. For this purpose, the second air guide element is arranged to be offset relative to the first air guide element in channel length direction towards the channel interior, as a result of which a region of sub-atmospheric pressure is formed downstream at the channel wall. 
     DE 34 37 259 C2 discloses a ventilating device with a plurality of mutually adjacent slats utilising a so-called Coanda effect. The slats are arranged in stationary position in a ventilating channel along a fixedly locked curve and mounted to be rotatable. They are controlled in such a way that each slat adopts a different angle with respect to the incident air. For setting a large outflow angle, one half of the air nozzles is so closed by the slats lying in this half that the slats form a convexly cambered curve. As a consequence of Coanda effect, the air flow is conducted along this convex curve and correspondingly deflected. 
     JP S54 108323 A discloses an air vent which is arranged at a vehicle roof and provides air pulsation. In order to provide the air pulsation, two curved regions are provided which increase the cross-section of an air channel to an air outlet section, wherein the cross-section of the air channel is reduced by an air supply channel. For this purpose, boundary walls facing the air supply channel are arranged normal to the air supply channel. The boundary walls additionally protrude further into the air supply channel than the curved regions, which are arranged at a spacing therefrom, in the air channel. A spacing is present between the boundary walls and the curved regions, wherein air is supplied in alternation to these thus-formed regions. 
     U.S. Pat. No. 4,989,807 A discloses an S-shaped power-plant intake diffusor, wherein a deflecting plate and an opening are provided in the diffusor. Air can be inducted or supplied by way of the opening. 
     The disadvantage with the air vents known from the prior art resides in the use of slats or other deflecting means which have to be moved. Movement of components of a device always has the risk that failure or disturbance can occur due to damage or failure of components of these devices. Thus, for example, slats could jam after frequent pivotation or the setting means, which are often mounted on a so-called control slat, could be moved only with difficulty. 
     However, air vents have to be simple to operate and without susceptibility to disturbances. In addition, it is desired for air vents to have a visually pleasant appearance. Various coatings for slats have indeed been indicated in the prior art, but the appearance of a ‘ventilation grill’, having horizontally and vertically extending slats, is perceived as unattractive particularly in motor vehicles. 
     It is therefore the object of the present invention to indicate an air vent which has a simple construction without components susceptible to fault and in addition offers a visually pleasing appearance. 
     According to the invention the object is fulfilled by an air vent with the technical features indicated in claim  1 . 
     Advantageous developments of the invention are indicated in detail in the subclaims. 
     An air vent according to the invention comprises a housing with an air outlet opening, a first connection to an air supply channel and a continuous flow channel, wherein the flow channel is constructed to be so curved at at least two opposite sections that the cross-section of the flow channel increases towards the air outlet opening and the at least two sections each have openings which each open into a chamber lying behind the sections, wherein the chambers each have a second connection, which is separated from the first connection, for supply or removal of air for generating overpressure and/or vacuum and wherein the sections have a plurality of rows of openings. 
     In the air vent according to the invention fresh air or air from an air-conditioning installation is conducted through the flow channel via the first connection from an air supply channel. The flow channel is so constructed that the air flows out of the air outlet opening at and along the curved sections and the flow produced by the curved shape is maintained due to Coanda effect, an that the air flow is deflected. In order to produce a setting of the air outflow direction, air is supplied to or removed from the chambers, which are located behind the sections, by way of the second connections, wherein overpressure regions and/or sub-atmospheric pressure regions arise in the sections. These overpressure and/or sub-atmospheric pressure regions produce a change in the direction of the outflowing air. Thus, through producing an overpressure in the two opposite sections a substantially rectilinear air flow from the air vent is set. If a vacuum is produced in the two opposite chambers of the sections, then the air is more strongly deflected so that a more diffuse air flow arises. If in the case of two opposite chambers an overpressure is produced in one chamber and a vacuum in the other chamber then deflection of the air flow in the direction of the section having the chamber in which the vacuum is produced takes place. 
     The air vent according to the invention does not have in the viewing region any mechanical air guide elements producing a change in the direction of the outflowing air. A visually pleasing appearance and a substantial degree of design freedom thereby result. In addition, an air vent of that kind needs less room than conventional air vents, which apart from the slats additionally have devices for simultaneous pivotation of a group of slats (for example, coupling rod) and mechanical setting means for pivoting the slats. In the case of the present invention the air intended for outflow is supplied by way of the air feed shaft. The change in outflow direction takes place by way of the second connections and air supply and air removal from the respective chambers of the curved sections. Means can be provided for setting the deflection of the air flowing out of the air vent, which means produce—mechanically, electrically or in another way—the air supply to and air removal from the chambers for setting the air outflow direction. However, there are no components, which additionally cause undesired turbulence, protruding into the air feed shaft, the continuous flow channel and the air outlet opening. Setting of the outflowing air takes place only by additional introduction of air through the openings of a chamber (overpressure) or by suction of the outflowing air through the openings of a chamber (vacuum). Due to the formation of overpressure or vacuum in the chambers and the curved configuration of the sections through utilisation of Coanda effect, a simple construction, which is not susceptible to disturbance, of an air vent is provided. 
     In order to supply or remove the air by way of the second connections of the chambers a device which blows in or sucks air in the sense of a compressor or a pump can be provided. Depending on the curvature of the sections as well as the cross-section of the flow channel, various deflections of the outflowing air can be set. Moreover, the degree of deflection of the outflowing air can be proportionally influenced by way of the setting of the vacuum or overpressure. 
     The air vent as well as the supply and removal of the air for producing overpressure and vacuum can be controlled by way of mechanical setting means (for example, joystick) or input by way of a display. 
     The housing of the air vent can also have four curved sections with openings, wherein in each instance two sections are mutually opposite and the four sections substantially form a flow channel which is rectangular in cross-section and each section has a separate chamber with a second connection for the supply or removal of air. Through the four curved sections the air can be deflected not only horizontally, but also vertically in both directions, and in addition horizontally and vertically deflected. For example, two mutually adjoining sections can be acted on by an overpressure and the other two sections acted on by a vacuum, so that an outflow direction downwardly and in a lateral direction arises. Depending on the intensity of the overpressure which is formed in the two overpressure chambers it is possible for one direction to be set more strongly than the other. For that purpose, there is produced by way of the second connections of these chambers an overpressure which is not in the same proportion, but is dependent on the desired outflow direction of the air. The same applies to formation of the vacuum by way of the corresponding chambers of the sections. 
     The openings can have an increasingly larger diameter in direction towards the air outlet opening. Deflection of the outflowing air is thereby improved. The sections can have several rows of openings. For example, a first row is arranged directly after the air supply channel and further rows following thereon extend in the direction of the air outflow opening, in which case the diameter of the openings increases with each row in direction towards the air outlet opening. 
     The openings can have, for example, a cross-section which is round, polygonal, oval or also any other form. Moreover, the size of the openings is to be dimensioned in dependence on the dimensioning of the air vent as well as the degree of deflection. 
     In particular, in further forms of embodiment of the air vent the sections can have a convex curvature. A convex curvature provides, for example, a diffuse air supply in the case of an outflowing air flow without formation of an overpressure or a vacuum in the chambers. 
     In further forms of embodiment the openings have a substantially round cross-section. 
     The flow channel can also have an even number of sections with openings which form a flow channel substantially round in cross-section, wherein each section has a separate chamber with a second connection for supply or removal of air. Beyond that, it is possible to provide all cross-sectional shapes for the flow channel. Appropriate sections with chambers lying therebehind are then to be provided in correspondence with the selected cross-sectional shapes. It is also possible, for example, for an uneven number of sections and thus an uneven number of chambers to be formed. In that regard it is important that each chamber has a separate second connection for the supply or removal of air. 
     The air vent can have a surround which surrounds the air outlet opening and which has in the region adjoining the air outlet opening a curvature corresponding with the sections. As a result, the deflection of the outflowing air is not obstructed by the surround, but instead assisted. 
     Moreover, the flow channel and the air supply channel can be no constructed that the flow channel and the air supply channel have substantially the same cross-section in the region of the first connection. This ensures that the outflowing air is not subjected to undesired deflection or turbulence by cross-sectional changes or edges such as would impair setting of the direction of the outflowing air. 
     In further forms of embodiment of the air vent the air supply channel has in front of the first connection at least one path which provides a substantially rectilinear air flow in the flow channel. This measure similarly serves the purpose of not negatively influencing deflection of the outflowing air. 
     The separate feed of air to the chambers of the sections by way of the second connections can be set and changed by way of a control. Control can, for example, be carried out mechanically by way of a control component, which is coupled with further means for supply and removal of the air with respect to the second connections, or electrically. 
     In further forms of embodiment the sections of the flow channel with the openings consist of a flexible material. The flexible material additionally enables easy deformation so that in the case of producing an overpressure in a chamber the section is urged by a defined amount into the flow channel, whereby a stronger degree of curvature and thus a stronger degree of deflection of the outflowing air arise. Moreover, through formation of the sections from a flexible material it is possible, when a vacuum is produced in a chamber, for deformation of this section to take place by a defined amount in the direction of the chamber so that as a result the deflection of the outflowing air can also be influenced. 
     The air vent as well as the housing of the air vent can, in further embodiments, consist of plastics material. Particularly suitable for that purpose are plastics which are appropriate for injection-moulding of the components of the air vent and have the required properties corresponding with the intended use of the air vent. 
     The second connections of the chambers can be connected at the rear side, which is remote from the air outlet opening, with a device for supply and/or removal of air for producing an overpressure and/or a vacuum in the chambers, for example the device is a compressor or a pump which extracts air from or feeds air to the chambers, wherein in addition the device can be coupled with a valve or with a plurality of valves which control the supply and removal of the air. For that purpose, an electrical and/or a software-based control can be included, which controls opening and closing of the valves, the amount of the overpressure or vacuum produced and the operation of the device (for example compressor and/or pump). 
     Moreover, setting means in accordance with which the direction, deflection and/or amount of outflowing air can be controlled can be arranged at a surround surrounding the air outlet opening. The setting means can control the direction, deflection and/or amount of outflowing air mechanically, as already indicated in the foregoing. However, beyond that the setting means can also electrically control a directional change, deflection and/or quantity regulation of the outflowing air. 
     Moreover, a closure device can be provided in the air supply channel, the closure device being constructed to allow or prevent air supply in the flow channel and to regulate the quantity of the supplied air. Closure devices of that kind are also termed, for example, throttle flaps. 
     In that regard, the closure device can be controllable by way of setting means arranged at a surround surrounding the air outlet opening. Thus, the closure device can, for example, be coupled with the setting means or a further means has the functionalities of the setting means and the closure device. The closure device can be controlled by way of the setting means electrically, mechanically or in another way. 
     Furthermore, the air supply to and air removal from the chambers can be regulated in the air vent, wherein in that regard the air supply and air removal are controllable so that apart from the supply and removal of air for producing an overpressure or a vacuum the strength of the pressure or overpressure and vacuum can also be controlled. 
     In further forms of embodiment the chambers are divided into at least two sub-chambers and either each have a separate second connection or at least one separating means, by way of which the volume of the thus-formed sub-chambers can be varied. As a result, an even finer setting of the outflowing air can be achieved. Alternatively, the respective individual sections can have a plurality of chambers which each have a separate second connection or are variable in the volume thereof by way of separating means. 
     Further features, design features and developments of the invention are evident from the following non-limiting description of the figures. 
     The embodiments shown in the figures have exemplifying character and are therefore not to be understood as limiting and can, in the case of forms of embodiment to be implemented, differ from the illustration. 
    
    
     
       In the drawings: 
         FIG. 1  shows a schematic illustration of an air vent in perspective view; 
         FIG. 2  shows a schematic illustration of an air vent in viewing direction onto an air outlet opening; 
         FIG. 3  shows a schematic illustration of an air vent in a side view; 
         FIG. 4  shows a schematic illustration of an air vent in viewing direction onto a connection for an air supply channel; 
         FIG. 5  shows a schematic partly sectional illustration of an air vent in a side view; and 
         FIG. 6  shows a further schematic partly sectional illustration of an air vent in a side view. 
     
    
    
     In the figures, parts provided with the same reference numerals substantially correspond with one another in the construction and function thereof. 
       FIG. 1  shows a schematic illustration of an air vent  10  in a perspective view, the components of the air vent  10  being illustrated schematically. 
     The air vent  10  has a housing  16 . A surround  12  is arranged at the housing  16  at a front air outlet opening  18 , wherein the opening of the surround  12  substantially corresponds with the air outlet opening  18  of the air vent  10 . In addition, a surround connection  14  is mounted on the surround  12 . A surround surrounding the air outlet opening  18  preferably consists of the surround  12  and the surround connection  14 , the illustration shown in  FIG. 1  being only by way of example. Thus, a surround can, for example, extend over an entire dashboard or the cladding element of the dashboard and form a surround with at least one opening for an air vent  10 . 
     The housing  16  of the air vent  10  has a first connection  20 , which is connected with an air supply channel  22  (not illustrated in  FIG. 1 ). The first connection  20  has a substantially rectangular cross-section and is connected with a flow channel  24  of the air vent  10 . The flow channel  24  has a diameter substantially corresponding with the first connection  20  in the connection region at the first connection  20 . The diameter of the flow channel  24  increases in direction towards the air outlet opening  18 . The flow channel  24  has four sections  26  and  28 , wherein in each instance two sections  26  and  28  are opposite one another and the flow channel  24  is surrounded by the four sections  26  and  28  and defined by the sections  26  and  28 . 
     The sections  26  and  28  additionally have openings  30 ,  32  and  34 . In  FIG. 1  only some of the openings  30 ,  32  and  34  are indicated, but the other openings, which are not designated, correspond with the designated openings  30 ,  32  and  34  in the respective rows. 
     The section  26  has, as shown, three rows of openings  30 ,  32  and  34 , wherein the diameter of the openings  30 ,  32  and  34  starting from the connecting region of the flow channel  24  with the first connection  20  increases towards the air outlet opening  18 . 
     Each of the sections  26  and  28  has a chamber  26  and  38  therebehind. A connection between the chambers  36 ,  38  and the flow channel  24  is present by way of the openings  30 ,  32  and  34 . The chambers  36  and  38  each have a second connection  40  and  42 . The two opposite chambers  36  of the sections  26  (in  FIG. 1  only the lower section  26  is illustrated) each have a separate second connection  40  and the chambers  38  of the sections  28  each have a second connection  42 . Air can be supplied or removed by way of the second connections  40  and  42  for generation of an overpressure or a vacuum in the corresponding chambers  36  and  38  as well as in the regions of the sections  26  and  28  with the openings  30 ,  32  and  34 . 
     The sections  26  and  28  are formed to be curved and have a convex curvature, wherein the cross-section of the flow channel  24  increases with increasing spacing from the first connection  20 . Correspondingly, the openings  30 ,  32  and  34  are also no formed that the diameter thereof increases in dependence on the increasing cross-section of the flow channel  24 . The convex curvature of the sections  26  and  28  has the effect that air supplied by the air supply channel  22  flows along the surface of the sections  26  and  28  due to so-called Coanda effect and is thus deflected to a specific extent. In order to influence the deflection of the outflowing air in desired manner, air is supplied to or removed from the second connections  40  and  42  no that, for example, air flows from the lower section  26  out of the openings  30 ,  32  and  34  and thus produces a deflection of the exiting air flow upwardly in the direction of the opposite section  26 . 
     The air supplied or removed by way of the second connections  40  and  42  is adjusted by way of a further device. The air flow, which is supplied by way of the air supply channel  22  to the air vent  10 , does not influence the air supplied to or air removed from the chambers  36  and  38  by way of the connections  40  and  42 . Consequently, there is an air flow by way of the air supply channel  22 —as already known from slat flows from the prior art—and additionally a so-called control air flow, which, for example, is selectively supplied to the connections  40  and  42  by a compressor via a valve or switching means. 
     In addition, air can also be removed by way of a compressor or a further device via the chambers  36  and  38 . Accordingly, air of the outflowing air flow is extracted by way of the openings  30 ,  32  and  34  by formation of sub-atmospheric regions in the corresponding chambers  36  and  38  and the regions of the sections  26  and  28  with the openings  30 ,  32  and  34 . 
     In order to control the outflowing air flow a control element (not illustrated) can be provided at the surround connection  14 , which element mechanically produces the supply of air to the chambers  36  and  38  or removal of air from the chambers  36  and  38 . However, the control can also be carried out electrically so that actuation of the control means regulates a corresponding action by a device for supplying and removing the air. A device of that kind can, however, also be controlled via a display of a motor vehicle, by way of which all settings, for example also those of an air conditioning installation, can be set. 
     The air vent  10  illustrated in  FIG. 1  produces, by the selective removal of air by way of the second connections  40  and  42  from the chambers  36  and  38 , a control of the outflowing air flow. In addition, the air supply channel  22  can comprise a throttle flap or other closure devices which, as described in the foregoing, is or are similarly controlled and sets or set the amount of outflowing air from the air vent  10  and can also completely prevent outflow. In addition, the amount of the air supplied to or removed from the chambers  36  and  38  can also be controlled by way of further means and devices so that the degree of deflection can also be controlled by way of those. 
       FIG. 2  shows a schematic illustration of an air vent  10  in viewing direction onto an air outlet opening  18 . In this illustration a surround  12 , a surround connection  14 , radiused regions  44  and  46  of the surround  12  and in each instance two mutually opposite sections  26  and  28  of the air vent  10  are illustrated. The sections  26  and  28  each have three rows of openings  30 ,  32  and  34 . The diameter of the openings  30 ,  32  and  34  increases, with increasing distance from the air outlet opening  18 , towards the air supply channel  22 . The air vent  10  of  FIG. 2  illustrates a plan view of the air vent  10  of  FIG. 1 . The sections  26  and  28  are therefore formed to be curved and the regions  44  and  46  of the surround  12  have a corresponding curvature, so that the outflowing air flow is not deflected or swirled by thus-formed deflecting edges and on that deflection by the curved sections  26  and  28  is continued through utilisation of Coanda effect. 
     In order to avoid turbulence of the air flow, transitions between the individual sections  26  and  28  are in addition formed to be radiused. 
       FIG. 2  additionally shows how the deflection of an issuing air flow for deflection in the viewing direction of  FIG. 2  downwardly and to the lefthand side can take place. For that purpose, air is introduced into or removed from the chambers  36  and  38  for producing overpressure and sub-atmospheric pressure regions by way of the connections  40  and  42  (not illustrated in  FIG. 2 ). This is schematically indicated by the arrows  60 , which illustrate outflowing air from the openings  30 ,  32  and  34 . Obviously, the air flows not only out of the designated openings  30 ,  32  and  34 , but also out of all openings  30 ,  32  and  34  associated with a chamber. Correspondingly, the air, as indicated by the arrows  62 , is also removed from the chambers  36  and  38  through all openings  30 ,  32  and  34 . 
     It is apparent from the illustration of  FIG. 2  that apart from utilisation of Coanda effect for deflection of the issuing air flow from the air outlet opening  18 , the introduction of air and the removal of air influence the air flow in the desired manner. The degree of deflection can additionally be set by the amount of the outflowing and removed air. However, in distinction from the illustration in  FIG. 2 , by way of example the two opposite regions  26  and the righthand section  28  can also serve for formation of overpressure regions through introduction of air via the openings  30 ,  32  and  34 , wherein through additional formation of a sub-atmospheric pressure region on the lefthand side in the lefthand section  28  a deflection of an issuing air flow to the left results. The four illustrated sections  26  and  28  can be controlled independently of one another so that not only the supply or removal of air, but also the degree of supply or removal of air is settable for each chamber  36  and  38  by the second connections  40  and  42  independently of one another. 
       FIG. 3  shows a schematic illustration of an air vent  10  in a side view. The air vent  10  illustrated in  FIG. 3  is a side view of the air vent  10  shown in  FIGS. 1 and 2 . An air supply channel  22 , which is connected with the first connection  20  of the air vent  10 , is schematically illustrated in  FIG. 3 . In addition, the two second connections  40  to an upper chamber  36  and a lower chamber  36  as well as a second connection  42  to a chamber  38  are illustrated. The second connections  40  and  42  are, for example, connected with a hose which leads to a valve of a further device which controls the supply and removal of air to and from the respective second connections  40  and  42  for producing overpressure and sub-atmospheric pressure in the chambers  36  and  38  and the regions of the sections  26  and  28  with the openings  30 ,  32  and  34 . 
     The chambers  36  are schematically indicated in  FIG. 3 . The chambers  36  therefore do not have a straight section, such as appears in  FIG. 3 , but have internal (in the housing  16 ) convexly curved sections  26  and  28 . 
       FIG. 4  shows a schematic illustration of an air vent  10  with a view onto a connection  20  for an air supply channel  22 . The rear view of an air vent  10  of  FIG. 4  shows the air vent  10 , which is already shown with respect to  FIGS. 1 to 3 , with a view of the first connection  20  and the second connections  40  and  42 . 
       FIG. 5  shows a schematic partly sectional illustration of an air vent  10  in a side view. The air vent  10  illustrated in  FIG. 5  shows a sectional view, wherein the air vent  10  shows an illustration of the air vent  10  shown in  FIGS. 1 to 4 . 
     The convex curvature of the sections  26  is shown in  FIG. 5 . The sections  28  have a corresponding curvature, but the curvature thereof is not apparent in  FIG. 5 . The regions  44  of the surround  12 , which bound the air outlet opening  18 , are radiused. However, in departure from the illustration in  FIG. 5  an exact continuation of the convex curvature of the sections  26  and correspondingly a continuation of the convex curvature of the sections  44  and  46  can be provided by the regions  46 . 
     The openings  30 ,  32  and  34  of a section  28  are illustrated in  FIG. 5 . The three illustrated rows with the openings  30 ,  32  and  34  do not extend, in the viewing direction of  FIG. 5 , along a vertical line, but are formed substantially parallel to a boundary edge by the surround  12 . In that regard.  FIG. 5  clearly shows that the diameter of the openings  30 ,  32  and  34  increases towards the air exit opening  18  starting from the first connection  20 . 
     Air is supplied (illustrated by arrow  48 ) to the air vent  10  by way of an air supply channel  22  (not illustrated) and air is separately supplied and removed (illustrated by the arrows  50 ) by way of the second connections  40  so as to deflect the issuing air flow in the desired direction. 
     The design of an air vent  10 , as shown in the figures, has the advantage that no components for deflecting the air flow protrude into the flow channel, so that there is also a reduction in disturbing noises which occur in conventional air vents due to the components protruding into the flow channel, and there is no creation of turbulence in the outflowing air. 
     It is additionally apparent through  FIG. 5  that the air supplied to or removed from the chambers  36  and in corresponding manner to or from the chambers  38  takes place by way of the openings  30 ,  32  and  34 . 
       FIG. 6  shows a further schematic partly sectional illustration of an air vent  10  in a side view. This side view shows, in one embodiment, how an air flow can be deflected downwardly. The air vent  10  of  FIG. 6  is a sectional view of the air vent  10  already described and illustrated with respect to  FIGS. 1 to 5 . In order to downwardly deflect (illustrated by arrow  52 ) the air flow (illustrated by arrow  48 ) from the air outlet opening  18  air is supplied (illustrated by arrow  54 ) to the upper chamber  36  by way of the second connection  40 . 
     For that purpose, air is removed (illustrated by arrow  56 ) from the lower chamber  36  by way of the second connection  40 . In that case, an overpressure region arises in the upper chamber  36  as well as the section  26  with the openings  30 ,  32  and  34  and a sub-atmospheric pressure region arises in the lower chamber  36  as well as the section  26  with the openings  30 ,  32  and  34 . It is indicated by way of the arrows  60  and  62  how the influencing of the outflowing air flow by supply of air to or removal of air from the chambers  36  (and correspondingly  38 ) can take place. 
     The air vent  10  illustrated and described in the description of the figures is suitable for the purpose of deflecting as desired—without noise and without a multiplicity of setting means arranged in a flow channel—an air flow by way of Coanda effect through the curved construction of the sections  26  and  28  and the generation of overpressure and sub-atmospheric pressure regions in the chambers  36  and  38  as well as the sections  26  and  28  with the openings  30 ,  32  and  34 . 
     REFERENCE NUMERAL LIST 
     
         
           10  air vent 
           12  surround 
           14  surround connection 
           16  housing 
           18  air outlet opening 
           20  first connection 
           22  air supply channel 
           24  flow channel 
           26  section 
           28  section 
           30  opening 
           32  opening 
           34  opening 
           36  chamber 
           38  chamber 
           40  second connection 
           42  second connection 
           44  region 
           46  region 
           48  arrow 
           50  arrow 
           52  arrow 
           54  arrow 
           56  arrow 
           60  arrow 
           62  arrow