Air conditioning unit for ceiling-mounted installation

Abstract

Air conditioning unit (10) for installation near the ceiling in a room to be air-conditioned, comprising a unit body (11), wherein the unit body (11) can be attached with a top (13) directly under a ceiling (14) of the room to be air-conditioned, and a lower area, in particular a downward-facing underside (15), of the unit body (11) is closed and has a circumferential wall (16) with at least one air outlet (22) for supplying air.

Description

The invention relates to an air conditioning device for close-ceiling installation according to claim 1.Modern space concepts are distinguished by the fact that ceilings are kept open, so that the technology otherwise installed in a ceiling space remains visible. In these concepts, other ceiling systems are dispensed with. Such concepts are used, for example, in rooms with ceiling heights of 3 to 5 meters, such as, for example, in offices, entry areas of authorities, supermarkets, but also in hotels. In the case of raw concrete ceilings, corresponding elements for lighting, for acoustic damping or also for air conditioning are often suspended. In these concepts, round lamps, in particular ring lamps, acoustic panels or also air outlets, are used. Known air-conditioning devices are designed as ceiling cassettes which do not have a corresponding compactness for the described purpose of use and which do not insert themselves visually in an advantageous manner into the space design.Due to the requirements of the air conditioning apparatus, these are bulky to allow the fans, heat exchangers, pumps, electrical components and the like to be accommodated within a housing. Therefore, above the device that is exclusively visible in known designs, additional device components extend that remain visible in open ceilings and interfere with the room design.Proceeding from this, the object of the present invention is to provide an air conditioning device for installation close to the ceiling, which is of particularly compact design and is suitable for installation close to the ceiling.An air conditioning apparatus for achieving this object has the features of claim 1. Accordingly, it is provided that the air-conditioning device has a device body which can be fastened with an upper side particularly close to a ceiling of the room to be air-conditioned. A lower region of the device body, in particular a downwardly pointing underside of the device body, is closed. A further essential feature of the invention consists in that a circumferential wall of the device body has at least one air outlet for discharging air. This compact construction of the air conditioning device according to the invention makes it possible to mount it particularly close to a ceiling of a room. Any technical components that are otherwise located on the device body are integrated into the device body.The invention preferably also provides that the wall encircling the appliance body has the at least one air outlet for discharging air in an upper half, in particular in an upper third or an upper quarter. In particular, it is conceivable for the encircling wall to have two, three, four, five or more air outlets, wherein these air outlets are arranged in the manner of a ring on the device body. Preferably, the invention can provide that the encircling wall has six to eight air outlets which are assigned to the encircling wall in the manner of a ring. By the ring-like positioning of the air outlets around the in particular cylindrical device body, a particularly homogeneous near field, but also a far field of the air flow can be generated, whereby a particularly pleasant climate can be generated in the room. By using several air outlets, the outflowing air receives a sufficiently large impulse to achieve a sufficient horizontal throw into the space. Simulations have shown that, in particular, the use of six to eight air outlets contribute to a homogeneous far field.A further advantageous exemplary embodiment of the invention can provide that the air outlets are formed by adjacent wedges, wherein the wedges are arranged in the air-conditioning device in the manner of a star. Within the device body, a plurality of wedges are arranged in an outer edge region, which point with their longer side outwards and their shorter side inwards. The number of wedges determines the number of air outlets. When using six wedges which are assigned to the edge region of the device body at an equal angular distance, six air outlets are produced. The shape of the wedges first produces six air jets which are separate from one another but diverge from one another in the near field of the air-conditioning device. That is, no outflowing air is generated in the near field between two adjacent air jets. Furthermore, the wedges are designed such that the air jets are merged again in the far field of the air-conditioning device, i.e. after a few meters, so that a homogeneous air curtain is produced.A particularly advantageous exemplary embodiment of the invention can provide that the wedges are of different design, in particular have different lengths and / or opening angles, in order to produce a homogeneous outflow behavior of the air. Due to the positioning of the technical components within the device body, in particular due to an eccentric positioning of a fan, the wedges have different shapes. Since the air within the device body is supplied to the wedges at different speeds and different pressures on account of the positioning of the technical components, the shape of the wedges is adapted to their respective relative position to the technical components in such a way that the emerging air jets are at least almost identical. Thus, a symmetrical near field can be generated by the position-dependent shape of the wedges, namely despite the eccentric position of the technical components within the device body.Finally, it is also conceivable that at least one air inlet is arranged on the top side, in particular above the at least one air outlet, wherein supply air can be taken in through the at least one air inlet, in particular over a solid angle of 360°, and the air inlet preferably has a filter. The air inlet is located on the upper side of the device body and is, for example, circular. By generating a negative pressure, for example by a fan, inside the device body, the air surrounding the air-conditioning device is drawn in. The air is drawn in through a narrow ring-like gap around the top side of the device. In the installed state, this gap is bounded upward by the ceiling. Due to the star-like air outlets, caused by the wedges, free spaces are formed between the star-like air flows, through which the supply air can be drawn into the air inlet. This geometry of the star-shaped air outlets, through which the exhaust air receives a high impulse, and of the air inlet, through which the supply air is drawn through the free spaces over a 360° solid angle, enables the induction between the different pressure ranges to be reduced, as a result of which the space can be conditioned particularly effectively.It is also preferably provided that a fan, preferably an axial fan, and / or an annular heat exchanger are arranged inside the device body, wherein the fan and / or the heat exchanger are positioned eccentrically in the in particular cylindrical device body. In order to create additional space within the device body, the fan and the heat exchanger are arranged eccentrically. As a result, a sufficient volume is created in an edge region within the device body in order to accommodate further components which would otherwise be arranged on the upper side of the device. The fan is located slightly above the annular heat exchanger or in the heat exchanger, so that supply air can be conducted effectively through the heat exchanger. The heat exchanger is positioned in the device body exactly in such a way that the air conditioned in the heat exchanger can emerge through the outlets. The eccentricity may be a few centimeters.In addition, it is conceivable that a pump, preferably a condensate pump, control electronics and other electronic components are arranged in a free sickle-shaped region between the heat exchanger and an inner wall of the device body. Furthermore, it is conceivable that further components in connection with the heat exchanger, such as valves and the like, are arranged in this region. It is also conceivable for a supply and discharge for a coolant to be located in this region, and for electrical connections for supplying the device with electrical energy and / or control information.In particular, it is conceivable for the pump and the control electronics and the other electronic components to be arranged in a molded part, wherein an upper side of the molded part forms at least one wedge. This shaped part is designed such that it can be joined positively into the sickle-shaped region. It is designed in such a way that it substantially protects the components mentioned from external influences. An essential feature of this molded part is that it is designed such that it likewise forms at least one wedge or a component of the wedge, so that a corresponding outlet for a homogeneous near field is provided even in the angular range in which the molded part is located.It is further conceivable that the wedges and an in particular eccentric inlet opening for the supply air are formed by a cover part which is connected to the device body and forms the upper side of the air conditioning device. In particular, this disk-like cover part has the downward-pointing wedges on an outer edge region and the inlet opening centrally or eccentrically from the center. This device cover is mounted on the device body in such a way that the wedges are positioned between the heat exchanger and the circumferential wall of the device body. The inlet opening is positioned directly above the fan. An embodiment of the invention can provide that all components, such as in particular the fan, the heat exchanger and the like, are fastened to the cover part. For this purpose, strut-like fastening means are provided, which can be screwed with their ends into the wedges.It is preferably further conceivable that a lower shell, preferably a condensate trough, is arranged on the underside of the device body, wherein this lower shell is mounted so as to be axially movable relative to the device body, in particular relative to a cover part. This lower shell can also be formed as part of the device body. The lower shell can be lowered downward by 10-20 cm, for example, in order to reach the interior of the air-conditioning device. By means of the lowering, cleaning and maintenance work can be carried out, namely without the device or the lower shell having to be completely removed from the ceiling. After the work has ended, the lower shell can be guided back into the starting position again and locked.Furthermore, it is preferably conceivable for a housing of the air-conditioning device to be able to be fastened to the underside, wherein this housing is in particular the encircling wall. This housing or the encircling wall can be equipped with different materials or variants of a wall of different colour design, so that the external appearance of the air-conditioning device can be changed flexibly. It is conceivable that differently colored diaphragms, which are designed magnetically, can be releasably connected to the wall.A further advantageous exemplary embodiment of the invention can provide that the device body, the lower shell and / or the molded part are formed from a foamed plastic, preferably from expanded polypropylene (EPP). In addition, it is conceivable that the components of the device are made of metal or another plastic or a combination thereof. The use of EPP is particularly advantageous since this material is simple to handle and particularly light. In addition, it has an acoustically attenuating effect, so that any noises of the fan can be reduced.Finally, the invention can provide that a diameter of the air conditioning device is 500 mm to 1000 mm, in particular 600 mm to 900 mm, preferably 850 mm, and a height is 100 mm to 400 mm, in particular 150 mm to 300 mm, preferably 200 mm. This dimensioning allows the air conditioning device to be advantageously integrated into existing space concepts. In particular, the compactness allows the device to be installed in a wide variety of ways in differently designed rooms.A preferred exemplary embodiment of the invention is explained in more detail below with reference to the drawings. In these show: FIG. 1 is a side view of an air conditioning apparatus, FIG. 2 is a perspective view of the opened air conditioning device according to FIG. 1 , FIG. 3 is a perspective view of the opened air conditioning device according to FIG. 1 , FIG. 4 is a sectional view of the air conditioning device according to FIG. 1 , FIG. 5 is an exploded view of the air conditioning apparatus of FIG. 1, FIG. 6 is another exploded view of the air conditioning apparatus of FIG. 1, FIG. 7 is a view of the air conditioning device according to FIG. 1 , FIG. 8 shows a view of the air conditioning device according to FIG. 1 without a filter, FIG. 9 is a side view of the opened air conditioning device according to FIG. 1 , FIG. 10 shows a schematic illustration of air flows during operation of the air-conditioning device according to FIG. 1, FIG. 11 is a further schematic illustration of air flows during operation of the air-conditioning device according to FIG. 1, and FIG. 12 shows a further schematic illustration of air flows during operation of the air-conditioning device according to FIG. 1.FIG. 1 shows a side view of a possible exemplary embodiment of an air-conditioning device 10. This air conditioning device 10 is suitable for being installed in a room particularly close to the ceiling and for being integrated into modern room concepts due to its compactness and the associated possibility of installation. Due to the property of a particularly homogeneous ejection of the conditioned air, a particularly advantageous room climate can be generated by this air conditioning device 10.The air conditioning apparatus 10 is basically composed of an apparatus body 11 in which the essential technical components are accommodated. It is provided that the device body 11 or a cover part 12 of the device body 11 can be mounted with an upper side 13 at a distance of a few centimeters, preferably 5-20 centimeters, below a ceiling 14. This is shown in a highly schematic manner in FIG. 10, for example. An underside 15 of the device body 11 points downwards, i.e. in the opposite direction of the ceiling 14. The device body 11 also has a circumferential wall 16. In the exemplary embodiment shown here, this wall 16 is designed as cylindrical. However, it is also conceivable for the cross section of this wall 16 to be polygonal. The peripheral edge 17 of the cover part 12, which is likewise cylindrical, can be part of the wall 16. Accordingly, the entire air conditioning device 10 is cylindrical and has a diameter 35 of 60 cm to 100 cm, preferably 85 cm.A tubular inlet 18 and a tubular outlet 19 are located on the cover part 12, and the air-conditioning device 10 can be supplied with a corresponding cooling medium, such as water, for example, through the inlet 18 and the outlet 19. For this purpose, the inlet 18 and the outlet 19 can be integrated into the ceiling 14. It is equally conceivable for electrical connections, not shown, for the air-conditioning device 10 to be guided into the ceiling.The cover part 12 is also assigned an opening 20 through which supply air can be sucked into the device body 11. In FIG. 1, a filter element 21 for filtering the incoming air is visible in a side view, which is located above the opening 20. In FIG. 1, a plurality of air outlets 22 in the wall 16 are likewise visible. These air outlets 22 serve for discharging the conditioned air to the environment. These air outlets 22 are substantially formed by wedges 23, which are respectively located between the air outlets 22, or the air outlets 22 are formed between the wedges 23. An essential feature of the invention consists in the fact that the air outlets 22 are arranged in an annular manner around the entire device body 11 or the wall 16. The air outlets 22 are located in a region assigned to the top side 13 or in an upper third or quarter of the wall 16.FIG. 2 shows a perspective view of the device body 11 without the cover part 12. As a result, a fan 24 for generating a reduced pressure in the device body 11 and a heat exchanger 25 for conditioning the air are visible. This fan 24 can be an axial fan. This fan 24 is arranged inside an annular heat exchanger 25. The heat exchanger 25 has a plurality of rings arranged one inside the other, which are arranged concentrically with respect to the fan 24. It can also be seen from FIG. 2 that the heat exchanger 25 is connected to the inlet 18 and the outlet 19. The wall 16 partially shown in FIG. 2 has a wide edge region 26, in which six receptacles 27 are located. These receptacles 27 are all of different design in the exemplary embodiment shown here. The receptacles 27 serve to receive the wedges 23, which are arranged on a lower side 28 of the cover part 12. The wedges 23 arranged on the underside 28 of the cover part 12 are illustrated in FIG. 3. A view from below of the cover part 12 is shown there. All the components which are also shown in FIG. 2 are mounted on the cover part 12. For this purpose, two struts 29 are used, among other things, which are fastened in two opposite wedges 23.FIG. 4 shows a sectional illustration of FIG. 1. For a better understanding of the technical design of the air conditioning device 10, auxiliary lines 30 are shown in FIG. 4, which describe a rectangular coordinate system, the geometrical center of the cylindrical air conditioning device 10 being located at the zero point of this system. It can be seen substantially from this sectional illustration that the fan 24 and the heat exchanger 25 are arranged eccentrically, that is to say not at the intersection point of the auxiliary lines 30, within the device body 11. This eccentric arrangement, which can already be seen in FIGS. 2 and 3, has the effect that a crescent-shaped region 31 can form between the heat exchanger 25 and the wall 16. This additional free area 31 serves to accommodate technical components such as electronics, valves and the like. By arranging these components in this region 31 within the device body 11, it can be achieved that no further components need to be mounted on the upper side 13 of the device body 11. This also allows the installation of the air conditioning device 10 close to the ceiling to be realized.In FIG. 4, the arrangement and the shape of the wedges 23 can also be seen. In the exemplary embodiment shown here, the device 10 has six wedges 23, which are arranged on the edge region 26 at an identical angular distance 32 from one another. In this view, it is also clear that the edge region 26 does not represent a symmetrical ring, but is likewise formed eccentrically. The angular distance 32 between the wedges 23 is determined substantially by the number of wedges 23 and by the width of the wedges 23. In the exemplary embodiment shown here, this angular distance 32 is between 40° and 50° or 43°. The width 33 of the wedges is 100 mm to 140 mm, preferably 122 mm. Accordingly, the wedges 23 assume an angular range 34 of 15°-20°, preferably 17°. From this view, it is also very clear that the shape of the six wedges 23 is different. These matching shapes of the wedges 23 are due to the eccentricity of the fan 24 and the heat exchanger 25. Because the fan 24 is not positioned centrally within the device body 11, the circulating air impinges on the wedges 23 at different speeds or pulses. In order to nevertheless produce a homogeneous flow pattern outside the device 10, the shapes of the wedges 23 are designed in such a way that the outflowing air flows are substantially the same for all air outlets 22.FIG. 5 shows an exploded view of the air-conditioning device 10. This illustration in particular highlights the configuration of the cover part 12 and the device body 11. The cover part 12 essentially represents a disc with an edge 17. Located eccentrically in the cover part 12 is the opening 20, which can be covered with the filter element 21. This opening 20 serves to direct the supply air 40 drawn in by the fan 24 into the apparatus 10 and then through the heat exchanger 25. Also visible are the wedges 23 which are arranged on the underside 28 of the cover part 12. These wedges 23 join each other when the cover part 14 is brought together with the device body 11 into the corresponding receptacles 27 of the edge region 26; FIG. 5 likewise shows the shaped part 36 which is supplied in the manner of a housing to the sickle-like region 31 within the device body 11. This molded part 36 has two functions: on the one hand, it serves to protect the electronic components, valves and the like which are arranged in the sickle-like region 31 and, on the other hand, the molded part 36 also forms receptacles 27 or parts of a receptacle 27 for the wedges 23 on an upper side. This shaped part 36 can therefore continue to form the circumferential air outlets 22, despite the components arranged in the device body 11.Both the cover part 12, the device body 11 and the molded part 36 can be formed from a foamed plastic, preferably from an expanded polypropylene (EPP). As a result, the entire device 10 is designed to be particularly light and simple to produce. In addition, EPP can have an acoustically attenuating effect. However, it is also conceivable for the aforementioned parts of the device 10 to be produced from a different material. In particular, connecting means for connecting the components can be metallic.FIG. 6 shows the perspective illustration of FIG. 5 from another direction. Here, the underside 28 of the cover part 12 is substantially visible. This illustration makes the different shapes of the wedges 23 clear. The exemplary embodiment of the opening 20 illustrated here provides for this to extend downward in the manner of a funnel in the direction of the fan 24. As a result, the air is guided to the fan even more efficiently. It can also be seen from FIG. 6 that the underside 15 of the device body 11 is closed. The exchange of the air, i.e. the suction and the removal of the air, thus takes place exclusively in the upper region of the air conditioning device 10.FIGS. 7 and 8 each show the top side 13 of the air-conditioning device 10 or of the cover part 12. While the filter element 21 is shown in FIG. 7, it has been omitted from the illustration of the fan in FIG. 8.The cover part 12 and the device body 11 can be axially displaceable relative to one another, so that for cleaning and maintenance purposes the device body 11 can be moved away downwards, namely without the device body 11 having to be separated from the cover part 12 for this purpose. This possibility of a specific embodiment is shown in FIG. 9. By lowering the cover 12, the appliance 10 can be cleaned or maintained while hanging on the ceiling 14. It is conceivable that the device body 11 can be lowered by the length 37 100 mm to 200 mm, preferably 155 mm. The height of the cover 38 can be 20 mm-50 mm, preferably 35 mm. The height 39 of the device body 11 can be 100 mm-200 mm, preferably 143 mm. For lowering the cover part 12, it can be provided that the device body 11 can be lowered at the braces 29. For this purpose, for example, corresponding fixing means must be released in order to lower the device body 11 and to fix it again accordingly when the device body 11 is returned to the initial position again after maintenance. It is also conceivable for a lower shell 45 to be arranged on the underside 15 of the device body 11. This lower shell can be designed as a condensate trough and serves to collect condensed water. During maintenance, this tray 45 can be cleaned or emptied.Referring now to Figures 10-12, the flow of air during operation of the air conditioning apparatus 10 is schematically illustrated. It can be seen from FIG. 10 that, when the fan 24 is running, the supply air 40 is drawn substantially from below into the gap between the air-conditioning device 10 and the ceiling 14. In this case, the supply air 40 is guided between the air outlets 22 exactly past the positions at which the wedges 23 are located. The exhaust air 41 is then discharged from the apparatus 10 through the air outlets 22 in the horizontal direction.In the perspective view according to FIG. 11, the air flow inside the air-conditioning device 10 becomes clear. It can be seen from this illustration that the supply air 40 is drawn into the opening 20 via the cover part 12, namely in particular at the positions at which the wedges 43 are located. The air is then passed through the heat exchanger 25 and returned to the room horizontally as exhaust air from the air outlets 22. It can be seen particularly clearly from this FIG. 11 that the supply air 40 is introduced into the device 10 exactly where no exhaust air 41 is discharged. The supply air 40 and the exhaust air 41 thus alternate in a star shape around the entire air conditioning device 10.FIG. 12 shows a simulation of the exhaust air 41 in the near field 42 directly around the air-conditioning device 10 and the far field 43. This illustration shows very clearly that the wedges 23 form a type of "air shadow" 44. The exhaust air 41 flowing out between the wedges 23 through the air outlets 22 is guided outwards divergingly and encloses the air shadows 44. Due to the divergence of the exhaust air 41, it is combined in the far field 43, so that a very homogeneous air flow distributes itself over the space, which leads to a particularly pleasant climate. Furthermore, this illustration makes it clear that different air shadows 44 are formed by the different types of wedges 23, but these are formed in such a way that a homogeneous far field 43 ultimately forms. Finally, it can also be seen very clearly from this view that the supply air 40 is sucked into the device 10 precisely in those regions in which the air shadows 44 are located.It should be expressly pointed out that the invention is not restricted to the exemplary embodiment shown here. Rather, it is conceivable that the invention is also implemented by other embodiments.List of reference numbers:10 Air-conditioning device 11 Device body 12 Cover part 13 Upper side 14 Ceiling 15 Lower side 16 Wall 17 Edge 18 Inlet 19 Outlet 20 Opening 21 Filter element 22 Air outlet 23 Wedge 24 Fan 25 Heat exchanger 26 Edge region 27 Receptacle 28 Lower side 29 Strut 30 Auxiliary line 31 Region 32 Angular spacing 33 Width 34 Angular range 35 Diameter 36 Shaped part 37 Length 38 Height 39 Height 40 Supply air 41 Exhaust air 42 Near field 43 Far field 44 Air shadow 45 Lower shell

Claims

Air-conditioning appliance (10) for installation close to the ceiling in a room to be air-conditioned, having an appliance body (11), wherein the appliance body (11) can be fastened with an upper side (13) directly under a ceiling (14) of the room to be air-conditioned, and a lower region, in particular a downwardly pointing lower side (15), of the appliance body (11) is closed and having a circumferential wall (16) with at least one air outlet (22) for discharging air.Air-conditioning device (10) for installation close to the ceiling according to Claim 1, characterized in that the wall (16) encircling the device body (11) has the at least one air outlet (22) for discharging air in an upper half, in particular in an upper third or an upper quarter.Air-conditioning device (10) for installation close to the ceiling according to Claim 2, characterized in that the encircling wall (16) has two, three, four, five or more air outlets (22), these outlets (22) being arranged in the manner of a ring on the device body (11).Air-conditioning device (10) for installation close to the ceiling according to Claim 3, characterized in that the encircling wall (16) has six to eight air outlets (22) which are assigned to the encircling wall (16) in the manner of a ring.Air-conditioning device (10) for installation close to the ceiling according to one of the preceding claims, characterized in that the air outlets (22) are formed by adjacent wedges (23), wherein the wedges (23) are arranged in the air-conditioning device (10) in the manner of a star.Air-conditioning device (10) for installation close to the ceiling according to Claim 5, characterized in that the wedges (23) are of different design, in particular have different lengths and / or opening angles (34), in order to produce a homogeneous outflow behavior of the air.Air-conditioning device (10) for installation close to the ceiling according to one of the preceding claims, characterized in that at least one air inlet (20) is arranged on the top side (13), in particular above the at least one air outlet (22), wherein supply air (40) can be drawn in through the at least one air inlet (20), in particular over a solid angle of 360°, and the air inlet (20) preferably has a filter (21).Air-conditioning device (10) for installation close to the ceiling according to one of the preceding claims, characterized in that a fan (24), preferably an axial fan, and / or an annular heat exchanger (25) are arranged inside the device body (10), wherein the fan (24) and / or the heat exchanger (25) are positioned eccentrically in the in particular cylindrical device body (11).Air-conditioning device (10) for installation close to the ceiling according to one of the preceding claims, characterized in that a pump, preferably a condensate pump, control electronics and other electronic components are arranged in a free sickle-shaped region (31) between the heat exchanger (25) and an inner wall of the device body (10).Air-conditioning device (10) for installation close to the ceiling according to Claim 9, characterized in that the pump and the control electronics and the other electronic components are arranged in a shaped part (36), wherein at least one wedge (23) is formed by an upper side of the shaped part.Air-conditioning device for installation close to the ceiling according to one of the preceding claims, characterized in that the wedges (23) and an in particular eccentric inlet opening (20) for the supply air (40) are formed by a cover part (12) which is connected to the device body (11) and forms the upper side (13) of the air-conditioning device (10).Air-conditioning appliance (10) for installation close to the ceiling according to one of the preceding claims, characterized in that a lower shell (45), preferably a condensate trough, is arranged on the underside (15) of the appliance body (11), wherein this lower shell (45) is mounted so as to be axially movable relative to the appliance body (11), in particular relative to a cover part (12).Air-conditioning device (10) for installation close to the ceiling according to Claim 12, characterized in that a housing of the air-conditioning device (10) can be fastened to the lower shell (45), this housing being in particular the encircling wall (16).Air-conditioning device (10) for installation close to the ceiling according to one of the preceding claims, characterized in that the device body (11), the cover part (12), the lower shell (45) and / or the molded part (36) are formed from a foamed plastic, preferably from expanded polypropylene (EPP).Air-conditioning device (10) for installation close to the ceiling according to one of the preceding claims, characterized in that a diameter (35) of the air-conditioning device is 500 mm to 1000 mm, in particular 600 mm to 900 mm, preferably 850 mm, and a height is 100 mm to 400 mm, in particular 150 mm to 300 mm, preferably 200 mm.

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