AU2012202939A1

AU2012202939A1 - Roof-Mounted Air Conditioning Unit for a Vehicle

Info

Publication number: AU2012202939A1
Application number: AU2012202939A
Authority: AU
Inventors: Werner HILLER; Johannes Laging; Uwe Mini; Claudia Schudlich
Original assignee: Truma Geraetetechnik GmbH and Co KG
Current assignee: Truma Geraetetechnik GmbH and Co KG
Priority date: 2011-05-25
Filing date: 2012-05-18
Publication date: 2012-12-13
Anticipated expiration: 2032-05-18
Also published as: EP2527173A1; AU2012202939B2; DK2527173T3; DE102011102343A1; EP2527173B1; DE102011102343B4

Abstract

Roof-Mounted Air Conditioning Unit for a Vehicle Summary An air conditioning unit (1) encompasses an air inlet channel, which leads away from 5 an air inlet (3, 3a, 3b), an air conveying device (11, 16), which is arranged downstream from the air inlet channel, a branching area, which is arranged downstream from the air conveying device (11), to at least two air outlet channels (13a, 13b), which in each case lead to an air outlet (4a, 4b), and a heat transmission device (10a, 10b), which is arranged in the air inlet channel and/or in the air outlet 10 channels (1 3a, 13b), and through which the air, which is guided through the air inlet channel and/or through the air outlet channels, is guided. The directions of the air flows, which escape through the respective air outlets (4a, 4b), are oriented differently. The air inlet (3, 3a, 3b) and the air outlets (4a, 4b) are open into a surrounding area outside of a room, which is to be air-conditioned.

Description

AUSTRALIA Patents Act 1990 COMPLETE SPECIFICATION Standard Patent Applicant(s) Truma GerAtetechnik GmbH & Co. KG Invention Title: Roof-Mounted Air Conditioning Unit for a Vehicle The following statement is a full description of this invention, including the best method for performing it known to me/us: - IA Roof-Mounted Air Conditioning Unit for a Vehicle Description The invention relates to an air conditioning unit, which can be used in particular as roof-mounted air-conditioning unit for a caravan or recreational vehicle. 5 Air conditioning units for vehicles, such as recreational vehicles or caravans, are often arranged on the upper side of the vehicle as complete units. Such roof-mounted air conditioning units generally encompass a complete cooling circuit, including compressor, evaporator and condenser. In one application, an air flow, which is sucked from of the interior of the vehicle, 10 can flow through the evaporator, which serves as heat transmitter, whereby the air flow can be cooled by means of the evaporator and can subsequently be guided back into the interior of the vehicle as cold air flow. A further heat transmitter, which is also arranged in the cooling circuit, can serve as condenser and can be cooled by ambient air from a surrounding area of the vehicle. 15 In an alternative application, the cooling circuit can be reversed and the interior air flow can be heated by means of the heat transmitter, which is now operated as condenser. In this application, the further heat transmitter can be operated as evaporator, which cools the ambient air. For the most part, roof-mounted air conditioning systems are operated when 20 stationary, for example at a campground or rest area. Operating noises can be created hereby, which can be a nuisance for the passengers of the vehicle as well as for adjacent residents. For this reason, the operation of roof-mounted air conditioning units has already been banned at least temporarily at several sites. In addition to the noises, which are developed by the aggregates arranged in the 25 cooling circuit, in particular the air flows, namely of the interior air flow, the temperature of which is to be controlled, as well as the ambient air flow, which are -2 stimulated in the roof-mounted air conditioning unit and which are guided through the roof-mounted air conditioning unit, are significant for the noise development. The invention is based on the object of specifying a roof-mounted air conditioning unit, in the case of which the noise development and noise emission is reduced. 5 The object is solved by means of an air conditioning unit according to patent claim 1. Further developments can be gathered from the dependent patent claims. An air conditioning unit encompasses an air inlet channel, which leads away from an air inlet, an air conveying device, which is arranged downstream from the air inlet channel, a branching area, which is arranged downstream from the air conveying 10 device, to at least two air outlet channels, which in each case lead to an air outlet, and a heat transmission device, which is arranged in the air inlet channel and/or in the air outlet channels and through which the air, which is guided through the air inlet channel and/or through the air outlet channels, is guided. The directions of the air flows, which escape through the respective air outlets, are thereby oriented differently. 15 The air inlet and the air outlets are open into a surrounding area outside of a room, which is to be air-conditioned. In the alternative, the air inlet and the air outlets can also lead into the room, which is to be air-conditioned. It is furthermore possible to provide for a plurality of air passing paths through the air conditioning unit. In the case of a first air passing path, 20 the air inlet and the air outlets can lead into a surrounding exterior area of the room, which is to be air-conditioned, and can guide ambient air through the air conditioning unit. In the case of a further air passing path, a further air inlet and further air outlets can lead into the room, which is to be air-conditioned, and can guide the air, which is to be air-conditioned, through the air conditioning unit. As do the air inlet and the air 25 outlets, the further air inlet and further air outlets can also encompass the features described below. A suction, which sucks air from a surrounding area of the air conditioning unit through the air inlet, for example a ventilation slot, a ventilation opening and/or a ventilation grille, is created at the air inlet channel by means of the air conveying -3 device, which can encompass one or a plurality of fan wheels comprising paddles or blades, respectively, for example, for conveying air. The air is distributed through the air inlet channel to the air conveying device and from there downstream via the branching area into the at least two air outlet channels, through which the air is in each 5 case released proportionally into the surrounding area of the air conditioning unit via the respective air outlets, for example through air outlet slots, air outlet openings or air outlet grilles. In response to this guiding, heat is released into the air or heat is withdrawn from the air by means of the heat transmission device, which is arranged in the air inlet 10 channel and/or in the air outlet channels. The air, which is heated or cooled in this manner, respectively, is then blown out into the surrounding area of the air conditioning unit. The air inlet and the air outlets can empty into an interior of a vehicle, for example, the temperature of which is to be controlled by means of the air conditioning 15 unit. In this case, the air conditioning unit can control the temperature of the air, which is guided through it, according to a specification given by an operator, for example, and can thus heat or cool, respectively, the interior of the vehicle. The air inlet and the air outlets, however, can also empty into a surrounding exterior area of the vehicle, on which the air conditioning unit is arranged, for 20 example as a roof-mounted air conditioning unit, and can thus provide for a removal or a supply of heat from the surrounding area of the vehicle to the cooling circuit. Accordingly, the heat transmission device can heat or cool the ambient air, depending on the application. For example, the heat transmission device can be a part of a closed cooling circuit, 25 which is arranged in the air conditioning unit, comprising a compressor, evaporator and condenser. Depending on the application and/or the orientation of the air inlet and of the air outlets, the heat transmission device can encompass the evaporator or the condenser of the cooling circuit. It is furthermore possible to design the function of the cooling circuit to be reversible such that the heat transmission device can take over -4 the function of the evaporator or of the condenser, respectively, in the cooling circuit, depending on the application. In the alternative, the heat transmission device can also encompass a different heating or cooling device for heating or cooling the air, which is guided through it, for 5 example an electrically operated heater. Provision can be made in the air conditioning unit for two separate air guiding devices, for example, an interior air guiding device and an ambient air guiding device, for guiding two separate air flows, an interior air flow or an ambient air flow, respectively. The interior air flow and the ambient air flow can be separated from one 10 another such that an air exchange is not possible. The interior air guiding device, the ambient air guiding device or both air guiding devices can in each case encompass an air inlet, an air inlet channel, an air conveying device, a branching area and in each case two air outlet channels comprising air outlets as described above. In the event that provision is made in both air guiding 15 devices for a respective heat transmission device, the respective heat transmission devices can be connected by means of a common cooling circuit. To obtain an adequate cooling power or heat output, respectively, a predetermined air flow must be reached in the interior air guiding device as well as in the ambient air guiding device. On the one hand, the respective air conveying devices must be 20 suitably dimensioned for this purpose. For example, a fan wheel used in the air conveying device can encompass a suitable number of blades having a suitable size and can be operated at a suitable speed. The air inlet, the air inlet channel, the air outlet channels and the air outlets must furthermore be suitably dimensioned in the respective air guiding device. The conditions of the available installation space must 25 be considered hereby. By blowing out the air, which is conveyed through the air conveying device, via the at least two air outlet channels, which are arranged downstream from the air conveying device downstream from the branching area, it can be attained that the flow speeds in the separated air flow are homogenized, as will be described in more detail -5 below. The local flow speeds and local orientations of the flows at different locations within the at least two air outlet channels must be considered thereby. In the event that the air flow, which is blown out by the air conveying device, is guided in an alternative design, which does not correspond to that of the invention, 5 through at least one channel comprising a large cross section, very high local flow speeds are present at certain locations within the channel, while considerably lower local flow speeds are present at other locations within the channel. This can lead to the formation of turbulences in the channel, which can create static noises. The air particles, which are guided through the channel at a high flow speed, furthermore 10 arrive at an air outlet, for example an air outlet grille, at a correspondingly high speed, which causes further turbulences and static noises. However, in the event that the air flow, which is blown out by the air conveying device, is divided in the branching area and is blown out proportionally through the at least two air outlet channels, overall reduced flow speeds of the air particles, which 15 are guided through the at least two air outlet channels (reduced maximum speed within the channel) can be observed on the one hand in the at least two air outlet channels due to the low required individual cross sections and due to the total cross section, which is at the same time increased in the sum of the air outlet channels as well as due to the improved orientation of the air outlet channel walls with reference 20 to the occurring flow and considerably lower differences in speed can be observed on the other hand (reduced differences of the flow speeds observed at different locations within one of the at least two air outlet channels). Turbulences and static noises in response to the impact on the air outlet are considerably reduced through this. Overall, a considerably lower noise development and emission is obtained through this. 25 A noise development at the air conveying device, for example the fan wheel, is thus better encased or encapsulated, respectively, in the unit due to the reduced individual cross sections of the two air outlet channels as compared to a single air outlet channel comprising a large cross section. Static noises of the air conveying device, for example due to a sound of rotation of the fan wheel or due to turbulences -6 at the blades, are thus discharged into the surrounding area of the air conditioning unit only to a weakened extent. In a further embodiment, at least one of the air outlet channels encompasses a cross sectional surface, which increases downstream, perpendicular to a main flow 5 direction of an air flow guided therein. The cross section of the air outlet channel consequently increases towards the air outlet. In other words, the air outlet channel is designed as a diffuser. With this design as a diffuser, a flow speed of the air can be slowed down downstream in the air outlet channel, that is, towards the air outlet. A slower impact of 10 the air flow or of the air particles, respectively, at an outlet grille can be attained through this. Noises, which appear when the air is guided through the respective air outlet, can be further reduced through this. In an embodiment, an air flow separating device is arranged in the branching area, wherein the air flow separating device encompasses a first edge, which defines a first 15 of the at least two air outlet channels, and a second edge, which defines a second one of the at least two air outlet channels and which adjoins a first edge in an apex. By separating the air flow, which is blown out through the air conveying device, at the apex of the air flow separating device and by passing the proportional partial air flows along the first edge to a first one of the at least two air outlet channels or along 20 the second edge, respectively, to a second one of the at least two air outlet channels, local flow orientations of the air particles can be oriented at the edges. Conversely, this means that the edges are oriented at the air, which enters, flow. Dynamic pressure and backwards turbulence areas are reduced through this. In an alternative of this embodiment, the first edge, the second edge and the apex 25 are formed such that an air flow, which is in each case guided along them, encompasses maximum speeds in the cross section below of a predetermined threshold value.

-7 This can be substantiated, for example by means of a calculating the local flow speeds in a flow simulation in a suitable mathematical simulation tool. By means of a suitable numerical optimization method, suitable moldings of the first and second edge and of the apex can be determined by providing the threshold value. For 5 example, cross sections of the first and of the second edge can be determined in a sectional plane along a flow direction of the partial air flows such that the maximum speeds of the partial air flows are minimized in the area of the edges of the air flow separating device and/or along the walls of the air outlet channels, for example, and the orientation thereof can be optimized. 10 In a further embodiment, the air conveying device encompasses a fan wheel, for example as already described above. In this embodiment, the first edge can be arranged in a running direction of the fan wheel downstream from the apex and can face the fan wheel substantially tangentially and the second edge can be arranged so as to lead away substantially tangentially from the fan wheel. The first edge can thereby 15 run tangentially to the fan wheel, but in particular parallel to a virtual tangent. A multiblade fan comprising 48 blades, for example, can be used as a fan wheel, for example. The sound of rotation of such a multiblade fan causes a background noise, which is less distracting for the human ear and which can be insulated well by means of the further mentioned measures for reducing the sound emissions. 20 The air flow separating device can be specified in the form of a wedge, which is arranged tangentially to the fan wheel, by means of such an arrangement of the first edge, the second edge and the apex to the fan wheel. Such an orientation of the wedge-shaped air flow separating device to the fan wheel prevents turbulences of the air flow, which is blown out through the fan wheel, for example, in the apex. 25 In a further embodiment, the first edge defines the air flow separating device convexly and the second edge defines the air separating device concavely. In this embodiment, the apex can be curved. The curvature and the convex or concave guiding, respectively, of the partial air flows, which are blown out by the air conveying device, prevent backflow areas in a 8 surrounding area of the air flow separating device, in which turbulences of the air, which is guided past it, can appear, which could lead to turbulence or spinning noises, respectively, for example. The noise development in response to the separation of the air flow and in response to the introduction into the air outlet channels is further 5 reduced through this. In a further embodiment, provision is made for a surrounding wall, which surrounds the fan wheel, wherein a distance of the surrounding wall from a radial outer edge of the fan wheel increases in a running direction of the fan wheel. A space formed between the surrounding wall and the radial outer edge of the fan 10 wheel, thus increases in the running direction of the fan wheel. A housing, which is formed by the surrounding wall and which surrounds the fan wheel, for example at an angle of more than 1350, or an air flow guide rail, which is open towards the fan wheel, but which is closed in the blow-out direction, respectively, is formed by means of this embodiment, whereby the housing or the air flow guide rail, respectively, in 15 running direction of the fan wheel, encompasses a radial distance to the fan wheel or to the axis of rotation of the fan wheel, respectively, which increases steadily. The surrounding wall it thus provided at least in an angle area around the axis of rotation of the fan wheel like a surrounding wall of a snail shell. The air flow conveyed through the fan wheel can thus be guided along the surrounding wall at an 20 increasing volume and can be slowed down or braked, respectively, like in a diffuser. The air guides of such an air flow guiding rail, which will also be identified hereinbelow as diffuser snail, at the fan wheel make it possible to obtain a high conveying volume of air, while already simultaneously lowering the top speeds at the surrounding wall of the fan wheel and to thus already slow down the air flow prior to 25 the impact at the air flow separating device. A lower noise development consequently appears in response to the introduction into the at least two air outlet channels. In an alternative, provision is made for a surrounding wall, which partially surrounds the fan wheel, whereby a distance of the surrounding wall from a radial outer edge of the fan wheel in the running direction of the fan wheel is substantially -9 constant and a height, which is measured lengthwise to the axis of rotation of the fan wheel, of a clearance, which is located between the surrounding wall and the fan wheel, increases in the running direction of the fan wheel. In this alternative, the height of the clearance located between the surrounding wall 5 and the fan wheel, which is to be measured parallel to or along the axis of rotation of the fan wheel, respectively, increases in the running direction of the fan wheel. In this alternative, the surrounding wall consequently surrounds the fan wheel in a predetermined angular range of more than 1350, for example, with a constant distance from the axis of rotation of the fan wheel and thus forms a housing, which is circular 10 in the angular range. The increasing height can act as a diffuser on the air, which is conveyed by the fan wheel, and can thus slow down the air flow, which is conveyed in the direction of the air outlet channels, prior to the introduction into the air outlet channels. Consequently, a noise development in response to the introduction into the air outlet channels can be reduced further. 15 In a further embodiment, provision is made in the clearance located between the surrounding wall and the fan wheel for a separating web, which surrounds the fan wheel at an angular range around the axis of rotation of the fan wheel, whereby the separating web separates the air flow, which is blown out by the fan wheel, and proportionally feeds it in each case to one of the air outlet channels. The angular range 20 can comprise at least 450, for example. Due to the early separation of the air flow by means of the separating web and the additional guiding of the partial air flows along the separating web, a homogenized flow speed of the two partial air flows can be reached when they flow into the air outlet channels. A noise development is reduced further through this. 25 In an embodiment, the separating web between the fan wheel and the surrounding wall can extend in a direction along the axis of rotation of the fan wheel substantially across a height of the fan wheel, which is measured along the axis of rotation of the fan wheel. The two partial air flows can then be introduced into the at least two air -10 outlet channels, which are radially offset, for example, at a slowed, even speed. The noise development in response to the introduction is further reduced through this. In a further embodiment, the separating web can extend in a plane perpendicular to the axis of rotation of the fan wheel, whereby the at least two air outlet channels can 5 be arranged axially along the axis of rotation of the fan wheel so as to be offset relative to one another. In this embodiment, the separating web separates the clearance surrounding the fan wheel in a plane perpendicular to the axis of rotation. The two partial air flows can thus be introduced into the air outlet channels, which can be arranged at an axial offset along the axis of rotation of the fan wheel, for example, at a 10 slowed, even speed. The noise development in response to the introduction is further reduced through this. In a further embodiment, the air conveying device can encompass a further fan wheel. The further fan wheel can be arranged so as to be axially offset next to the fan wheel such that it encompasses the same axis of rotation. By using a further fan 15 wheel, the fan wheel and the further fan wheel can be designed so as to have a smaller diameter in each case and/or they can be operated at a lower speed in each case. A further reduced noise development can be obtained through this. The use of the two fan wheels furthermore provides for an early separation of the conveyed air flow, for example by means of additional separating webs and separating planes, which can be 20 retracted perpendicular to the common axis of rotation, e.g. between the two fan wheels. In an embodiment, the heat transmission device can be arranged in the air inlet channel. A first section of the air inlet channel between the air inlet and the heat transmission device in a main flow direction of the air flow can thereby also be shorter 25 than 1.5 cm. For example, the air inlet can be formed by means of an air inlet slot or an air inlet opening, whereby a ventilation grille can be arranged upstream of the air inlet opening. The air inlet channel, which follows the air inlet and through which the air, which is sucked in by the air conveying device, is conveyed to the heat transmission device, can be designed arbitrarily. In particular, the first section can be - 11 formed by means of a clearance, through which the air, which is sucked in through the air inlet, is guided onto the heat transmission device and subsequently through it. In this arrangement, the heat transmission device, which can encompass narrow channels for guiding through the air, for example, forms a barrier in the air inlet 5 channel. Dirt, such as dry leaves, which is sucked in with the air, cannot reach through this barrier from the first section into a section of the air inlet channel, which is located downstream from the heat transmission device. For example, the dirt cannot reach the air conveying device or the fan wheel, respectively, and cannot contaminate or block it. 10 Due to the design of the first section, which is short in the main flow direction of the air flow, the first section can be cleaned easily. For example, leaves, which are hindered by the heat transmission device from further entering the air inlet channel, can possibly still partially project out of the air inlet into a surrounding area of the air conditioning unit and can thus be removed easily. The air inlet can furthermore 15 encompass a removable grille and can thus provide for a simple cleaning of the first section. Dust and dirt, which has penetrated, can be removed easily through this. By mostly keeping dust and dirt out of the air guides of the air conditioning unit, less static noises are created in response to the operation thereof, which further reduces the noise development. 20 It is possible in a further embodiment that the heat transmission device is flown against via different air inlet channels, whereby the respective air flows from the different air inlet channels in each case also flow against or flow through, respectively, different areas of the heat transmission device. In a further embodiment, the directions of the air flows, which escape through the 25 respective air outlets, are oriented differently. For example, the directions can be offset radially to one another with reference to a vertical axis of the air conditioning unit. This can be obtained, for example, in that the at least two air inlet channels are guided in radially different direction, for example relative to the axis of rotation of the fan wheel, to the respective air outlets. For example, the at least two air outlet -12 openings can be oriented backwards relative to an assembly position of the air conditioning unit on the roof of the vehicle in the direction of travel, but offset relative to one another at an angle of approximately 600 to 900. By blowing out the air in different directions, the sound, which is created when the 5 air escapes through the respective air outlets, and the sound, which is created in the air conditioning unit and which is brought out with the air, is distributed in different directions, so that lower noise levels can be obtained sporadically in the surrounding area of the air conditioning unit, that is at individual locations. In an alternative of this embodiment, the respective air outlets are in each case 10 arranged at different sides of the air conditioning unit. For example, one of the air outlets can be oriented relative to the assembly position of the air conditioning unit toward a side at right angles to the direction of travel, for example to the left or to the right. At least one of the air outlets can furthermore also be oriented in the direction of travel in the rear, upwards and/or downwards onto the roof, while a different one of 15 the at least two air outlets is arranged at a different side of the air conditioning unit. Lower sound levels can also be obtained sporadically in a surrounding area of the air conditioning unit by means of this measure. In an alternative of this embodiment, at least one of the air outlets and/or air inlet channels can be locked and/or can be rotated and/or displaced relative to the 20 installation position. A locking or rotating and/or displacing can be carried out by an operator, for example, who rotates the air outlet and/or the air outlet channel or the unit, respectively, about an axis of rotation relative to the assembly position, for example, or who closes the air outlet and/or the air outlet channel by means of a flap. For this purpose, provision can also be made for a control, which can be operated by 25 the operator. This makes it possible to selectively lock and/or rotate individual air outlets, for example depending on the parking position and surrounding area, and to thus obtain a noise development, which is as low as possible, in the direction of an adjacent resident, for example.

13 In a further embodiment, the air inlet channel, the first one of the at least two air outlet channels, the second one of the at least two air inlet channels, the air flow separating device and/or the surrounding wall is formed completely or partially of a sound-insulating material, is surrounded by a sound-insulating material and/or is 5 coated with a sound-insulating material. By means of such an embodiment of the air guiding housing parts of the air conditioning unit, the noise emission, which is created by guiding the air through, can be reduced further and can be encapsulated in the unit. In an alternative of this embodiment, expanded polypropylene and/or an open pored foam can be used as sound-insulating material. Due to its plasticity, the soft 10 granulate structure of the expanded polypropylene, for example, is suitable for embodying the channel structures, the surrounding wall and the air flow separating device. The sound-insulating characteristics of the expanded polypropylene can be strengthened further in that a granulate structure comprising open grains, that is, 15 comprising small hollow spaces, is used. In the event that an open-pored foam is used for sound insulation, this foam can be coated with a foil cover at the surfaces, which are in contact with the ambient air, whereby the foil cover effectively prevents or can prevent, respectively, a permeation of moisture and thus a permeation of bacteria into the air guiding devices of the air 20 conditioning unit. In a further embodiment, the air inlet channel and/or at least one of the at least two air inlet channels can be longer than wide. That is, it can encompass a larger length (along the main flow direction) than width (at right angles to the main flow direction) relative to a main flow direction of the air, which flows through it. By means of this 25 design, the noises created at the air conveying device or the fan wheel, respectively, can be encapsulated within the unit and can be guided to the outside in only a weak form. To provide for such a design of the air inlet channel or of the air outlet channels, respectively, in a tight installation space, they can also be guided in a curved manner.

- 14 By means of the curvature, the noise emission to the outside is reduced further. Such a design of the air inlet and/or air outlet channels is particularly effective in combination with a total or partial lining or casing with sound-insulating material, as already described above. 5 In an embodiment, the material forming the air outlet channels is formed such that there is no visual contact between the fan wheel and the surrounding area of the air conditioning unit. This means that the fan wheel is not visible from the outside. A particularly effective noise reduction can be obtained in this manner, e.g., the material can form the surrounding wall or the air outlet channels, respectively, such that the air 10 flow is redirected, so that a continuously straight air flow from the fan wheel to the outside to the air outlet does not take place. The material, in particular if it additionally also encompasses sound-insulating characteristics, thus also serves to block the sound, which is emitted by the fan wheel. In a further embodiment, the air flow separating device and/or the sound-insulating 15 material can be retrofitted. For example, an air flow separating device, which is formed in the manner described above, potentially lined with sound-insulating material as well as additional sound-insulating material can be offered for lining the housing or the air inlet channel, respectively, and/or the air outlet channels, which can be retrofitted at an existing air conditioning unit, for example comprising air guiding 20 channels made of plastic and comprising a less suitable air flow separating device or without an air flow separating device, respectively. This makes it possible to improve the noise emissions even in the case of older air conditioning units or to offer different alternatives of the air conditioning unit, respectively. In a further embodiment, the air conditioning unit is a roof-mounted air 25 conditioning unit for a vehicle. For example, the air conditioning unit can be suitable for set-up on the roof of a vehicle and for the air-conditioning of an interior of the vehicle. The above-mentioned features make it possible to provide an air conditioning unit, for example a roof-mounted air conditioning unit, which has lower sound emissions, - 15 for installation on the roof of a vehicle. For example, in the event that an ambient air guiding device of such an air conditioning unit encompasses individual or a combination of the afore-described features, the sound emissions of the air conditioning unit to the outside can be reduced considerably, which improves a 5 usability of the air conditioning unit, for example in response to the use on public campgrounds. However, in the event that an interior air guiding device of such an air conditioning unit alternatively or additionally encompasses individual or combinations of the afore-described features, noise emissions into the interior of the vehicle can be reduced, which increases the comfort of the passengers. It goes without saying that 10 arbitrary combinations of the features can be implemented in the interior air guiding device as well as in the ambient air guiding device, so as to lower or completely prevent a noise disturbance for the passengers as well as for the environment caused by the air conditioning unit. These and further features will be defined in more detail below by means of 15 examples with the aid of the accompanying figures. Fig. 1 shows, in a perspective view, a roof-mounted air conditioning unit for assembly on a vehicle; Fig. 2 shows the roof-mounted air conditioning unit from Fig. I in a perspective view of the bottom side; 20 Fig. 3 shows a schematic sectional view through the roof-mounted air conditioning unit from Fig. 1 in a horizontal sectional plane relative to an assembly position on a roof of a vehicle; Fig. 4 shows the roof-mounted air conditioning unit from Fig. I in a perspective view with a partial section into the horizontal sectional plane; 25 Fig. 5 shows the roof-mounted air conditioning unit from Fig. I in a side view with section through the roof-mounted air conditioning unit in a sectional plane, which is vertical relative to the assembly position; - 16 Fig. 6 shows a schematic illustration of an air flow guide in a roof-mounted air conditioning unit; Fig. 7 shows a schematic illustration of an alternative of the air flow guide from Fig. 6; 5 Figs. 8a to 8d show alternatives of air flow guides in the area of a fan wheel; Figs. 9a and 9b show alternatives for blowing out an air flow; Figs. 10a and 10b show further alternatives for blowing out the air flow; and Fig. 11 shows a further alternative for blowing out the air flow. Fig. 1 shows, in a perspective top view, an air conditioning unit 1, which can be 10 assembled on the roof of a vehicle, for example of a travel trailer or caravan. The air conditioning unit I has a housing 2, which can be formed such that it creates an air resistance, which is as small as possible, in the direction of travel of the vehicle. Provision can be made on the housing 2 for one or a plurality of ambient air inlets 3, which can in each case be designed, for example, in the form of one or a plurality of 15 air inlet slots or in the form of air inlet openings, which are provided with a grille. In addition, provision is made for example in a rearward direction in the direction of travel for two ambient air outlets 4a and 4b in each case comprising a grille for protection against interference, view and contaminations. Provision can be made between the ambient air inlet 3 and the ambient air outlets 20 4a and 4b within the housing for an ambient air guiding device, for example comprising air inlet channels, air outlet channels and an air conveying device for sucking the ambient air through the ambient air inlet 3 and for blowing the ambient air out via the ambient air outlets 4a and 4b. In Fig. 2, the air conditioning unit from Fig. I is shown in a perspective view from 25 the bottom. In this view, the design of the ambient air inlet 3 can be seen as air inlet slot comprising webs 3c, 3d and 3e. For installation, provision is made for roof support elements 6a and 6b as well as for mounting seals 5, 7. Interior air inlets 8a, 8b - 17 and 8c for blowing air from the interior of the vehicle and an interior air outlet 9 for blowing out the heated or cooled interior air, for example, into the interior of the vehicle, are located within the sealed area, in the front in the forward direction of travel. Provision can be made between the interior air inlets 8a, 8b and 8c and the 5 interior air outlet 9 within the housing 2 for an interior air guiding device, for example comprising one or a plurality of air inlet channels, an air conveying device and a plurality of air outlet channels, which make it possible to guide the interior air through the air conditioning unit I for the purpose of controlling the temperature of the interior air. 10 Fig. 3 shows the air conditioning unit I in a sectional view with section in a horizontal sectional plane relative to the assembly position on the roof of the vehicle. It becomes clear in the sectional view that the ambient air inlet 3 in one embodiment is formed by two lateral ambient air inlets 3a and 3b. It furthermore becomes clear that the ambient air, which is sucked in through the lateral ambient air inlets 3a, 3b, 15 impacts heat transmitters 10a and 10b after being sucked in, through which it is sucked into an interior 12 of the housing 2 due to the suction created by a fan wheel 11. The fan wheel 11 blows the ambient air, which is sucked in, through air outlet channels 13a, 13b to the ambient air outlets 4a, 4b, through which the ambient air reaches to the outside. Heat, which is created in the heat transmission devices 10a and 20 1Ob, for example, can be output to the ambient air by means of the ambient air guide formed through this, and can be discharged by means of it. Likewise, heat can also be removed from the ambient air, which is sucked through the heat transmission devices 10a and I0b. This depends on the application of the roof-mounted air conditioning unit, which can include the heating or, in the alternative, the cooling of the interior of 25 the vehicle, for example. The fan wheel 11, which acts as air conveying device for the ambient air, is arranged in the interior 12 as a multiblade fan comprising 48 blades, for example, and can be operated at a speed, which corresponds to the air conveying needs and which can be adapted to a required heating or cooling output of the air conditioning unit.

18 The heat transmission devices 10a, 10b are connected to a further heat transmission device 15 via a compressor 14 in a closed cooling circuit. The further heat transmission device 15 is arranged downstream behind the interior air inlet openings 8a, 8b, 8c and the interior air, which flows in and which is sucked in by a 5 further fan wheel 16, flows through it, whereby the temperature of the interior air can be controlled, that is, it can be heated or cooled, depending on the application. The further fan wheel 16 blows out the interior air, the temperature of which has been controlled, through the interior air outlet 9 into the interior of the vehicle. By means of this interior air guiding device, the temperature of the interior air can be controlled, for 10 example according to the specifications provided by an operator at the air conditioning unit I or at a control device thereof, respectively. In the case of the application "cool interior", the heat transmission devices I Oa and 10b operate as condensers and the further heat transmission device 15 operates as evaporator, so that the interior air, which is guided through the interior air guiding 15 device, is cooled and the heat created thereby is discharged into the surrounding area of the vehicle. In the case of the further application "heat interior", the heat transmission devices I Oa and I Ob operate as evaporators and the further transmission device 15 operates as condenser, whereby the interior air, which is guided through the interior air guiding device, is heated and heat is removed from the ambient air. 20 As is illustrated in Fig. 3, the air flow of the ambient air, which is blown out by the fan wheel 11, is blown out downstream from the fan wheel 11 into two air outlet channels 13a and 13b. By separating the air flow into the two separate air outlet channels 13a, 13b, the individual cross section, for example of each of the two air outlet channels 13a, 13b can be reduced as compared to a sole air outlet channel, 25 which is also possible, the total cross section can be increased as sum of the individual cross sections. Through this, the flow speeds of the air particles, which appear in the air outlet channels 13a, 13b, can be homogenized, for example, by means of the friction at the borders or walls, respectively, of the air outlet channels 13a, 13b, that is, smaller difference in speeds occur at adjacent locations within the air outlet channels 30 13a, 13b. Due to the smaller difference in speeds, the occurrence of turbulences, - 19 which can be the cause for noise developments, is rarer. The sound of rotation caused by the fan wheel 11 as well as noises caused by turbulences in the area of the fan wheel 11 are furthermore encapsulated in the air conditioning unit I by means of the comparatively narrow air outlet channels 13a, 13b, so that noise emissions are reduced 5 towards the outside via the airborne sound. Perpendicular to a main flow direction of an air flow, which is in each case guided therein, the air outlet channels 13a, 13b encompass a cross sectional surface, which increases downstream in the direction of the air outlets 4a, 4b. Due to the this geometry, the air outlet channels 13a, 13b act as diffuser and lower the flow speed of 10 the air flows or air particles, respectively, which are in each case guided therein, on their way to the air outlet. When the ambient air, which is blown out, impacts a grille of the ambient air outlets 4a, 4b, the air flow is thus already slowed down, so that noises and turbulences arising at the grilles are reduced. A noise emission of the air conditioning unit 1 can be reduced further through this. 15 The air outlet channels 13a and 13b are separated by means of an air flow separating device 17, which is arranged in a branching area, which is located downstream from the fan wheel 11. The air flow separating device 17 encompasses a first edge 17a, a second edge 17b and an apex 17c in an adjoining area of the first and second edges 17a, 17b. The form of the air flow separating device, in particular of the 20 first edge 17a, of the second edge 17b and of the apex 17c, can be chosen such that an air flow, which is in each case guided along it, encompasses a local maximum speed, which is as low as possible. To determine such a form, a common program for flow simulation can be used, which calculates the speeds appearing at different locations in the air outlet channels 13a, 13b and which optimizes a molding of the air flow 25 separating device 17 such that the speeds calculated in the air outlet channels 13a, 13b are as low as possible or are below a predetermined threshold value, respectively. In the illustrated form, the first edge 17a faces the fan wheel 11 in a substantially tangential manner and is arranged downstream from the apex in a running direction of the fan wheel. The first edge 17a can be displaced radially to the fan wheel 11, for 30 example. The first edge 17a defines the air flow separating device 17 convexly. The -20 second edge 17b is arranged so as to lead away from the fan wheel I1 and defines the air flow separating device 17 concavely. For example, the second edge 17b can lead away from the fan wheel 11 substantially in an extension of a tangent at an outer periphery of the fan wheel 11. The apex 17c is curved. Due to this curved wedge 5 shape of the air flow separating device 17, which is placed at an inclined position in the air flow, a separation of the ambient air flow, which is blown out by the fan wheel 11, is made possible, without backflow areas being able to form at the air flow separating device 17, which could otherwise be the cause for turbulences and high differences in speeds and which could thus lead to a noise development. The noise 10 development in the ambient air guiding device is considerably reduced through this and the noise emissions into a surrounding area of the vehicle are reduced. The fan wheel 11 is partially surrounded by a surrounding wall 18, which can surround the fan wheel 11, for example at an angle of more than 1350 about an axis of rotation of the fan wheel 11. By means of the surrounding wall 18, the ambient air 15 conveyed by the fan wheel 11 is guided in the direction of the air outlet channels 13a, 13b. In the shown embodiment, a distance of the surrounding wall from a radial outer edge of the fan wheel increases in a running direction of the fan wheel 11. The surrounding wall 18 thus forms a snail shell-like housing around the fan wheel 1. By means of this design, the air spun outwards by the fan wheel 11 is slowed down 20 downstream by means of the widening of the distance and thus hits the air outlet channels 13a and 13b or the air flow separating device 17, respectively, at a lower speed. Noise developments can be further reduced through this. By the orientation of the air outlet channels 13a and 13b within the housing 2 of the air conditioning unit 1, the air flows escaping through the ambient air outlets 4a 25 and 4b escape from the air conditioning unit I in each case in different directions. The sound, which is emitted from the air conditioning unit, is then propagated into the surrounding area in different directions. A noise disturbance, which occurs sporadically in a surrounding area of the roof-mounted air conditioning unit 1, can be prevented through this, in particular compared to an embodiment, in the case of which -21 the ambient air flows, which are guided out of the unit, are blown out only in one direction and thus propagate the sound only in one direction. By means of the arrangement of the heat transmission devices 10a and 10b just downstream from the lateral ambient air inlets 3a, 3b, that is, at a distance of less than 5 1 or 1.5 cm, for example, a first section of the ambient air guiding device is limited to a very narrow space between the lateral ambient air inlets 3a, 3b on the one side and between the heat transmission devices 1 Oa and I Ob on the other side. Before the ambient air enters into the interior 12 of the air conditioning unit 1, the ambient air is sucked through the heat transmission devices 10a and l0b. In the case 10 of a suitable design, for example with narrow passages, they can act as barrier or filter, respectively, for dirt particles, such as dry leaves, for example, which can penetrate through the lateral ambient air inlets 3a and 3b. The dirt particles and the leaves are caught just downstream from the lateral ambient air inlets 3a and 3b by means of the heat transmission devices 1Oa and 1Ob and cannot penetrate into the interior 12 of the 15 air conditioning unit 1. The dirt particles and the leaves can be removed easily from the areas between the lateral ambient air inlets 3a and 3b and the heat transmission devices 1Oa and lOb. Due to the fact that leaves and dirt particles are often the cause for static noises, such as a buzzing or fluttering noise, the noise development in response to an operation of the air conditioning unit 1 can be reduced further through 20 this. Fig. 4 shows the air conditioning unit I in a lateral perspective view with a partial section in a horizontal sectional plane relative to the assembly position of the air conditioning unit 1. In this illustration, the guiding of the ambient air with suction can be traced in the direction of the arrows 19a and 19b through the ambient air inlets 3a 25 and 3b and through the heat transmission devices 1Oa and lOb to the fan wheel 11 and the acceleration through the fan wheel 11 and the blow-out through the air outlet channels 13a and 13b out of the ambient air outlets 4a and 4b can be traced in the direction of the arrows 20a and 20b. In addition, the spatial design or the surrounding of a channel, respectively, for guiding the ambient air, which is accelerated by the fan 30 wheel, through the surrounding wall 18, becomes clear.

-22 Fig. 5 shows the air conditioning unit I in a lateral sectional view in a sectional plane located at right angles to the direction of travel relative to the assembly position of the air conditioning unit through an axis of rotation 21 of the fan wheel 11. In this sectional view, the design of the surrounding wall 18 and thus the molding of a 5 diffuser along an outer edge of the fan wheel 11 is clarified. In the sectional view, a distance between the surrounding wall 18 and a radial outer edge of the fan wheel 11 is less to the left of the fan wheel 11 than to the right next to the fan wheel 11, where the distance between the surrounding wall 18 and the radial outer edge of the fan wheel 11 is considerably larger. The channel for guiding the ambient air, which is 10 blown out by the fan wheel 11, which is formed by the surrounding wall 18, thus acts as diffuser and slows down the ambient air, which is blown out, on its way to the ambient air outlets 4a and 4b. In the lateral sectional view, the arrangement of the heat transmission device 10a and 10b can furthermore be seen just, that is, for example maximally 1.5 cm, 15 downstream from the ambient air inlets 3a and 3b. It becomes clear that dry leaves and contaminations cannot reach into the interior 12 and can be removed easily through the ambient air inlets 3a and 3b. Fig. 6 shows, schematically, the ambient air guide paths in an air conditioning unit by blowing out the ambient air flow through air outlet channels 13a and 13b in 20 different directions. The shaded area 22 thereby shows possible arrangements for a sound-insulating material. Expanded polypropylene or an open-pored foam can be used as sound-insulating material, for example, When using expanded polypropylene, a granulate structure comprising open grains can also be chosen, which encompasses improved sound insulating characteristics. It is furthermore possible to apply sound 25 insulating material in the area of the ambient air inlets 3a, 3b, in the area of the surrounding wall 18 of the fan wheel 11 as well as in the area of the ambient air outlets 4a, 4b, for example as coating, or to mold these elements from the sound insulating material. Fig. 7 shows an alternative arrangement of the air outlet channels 13a and 13b, in 30 which the air outlet channels 13a and 13b are guided laterally outwards to opposite -23 sides. A length of the air outlet channel 13a and 13b is hereby in each case chosen to be larger than a width, based on the main flow direction, which is suggested by the arrows. By means of this long and narrow channel geometry, noises, which can be created in the area of the fan wheel, are encapsulated in the air conditioning unit and 5 are guided to the outside only in a weakened manner or are propagated to the outside only in a weakened manner, respectively, by means of the air flows. Figs. 8a to 8d show different embodiments of the surrounding area of the fan wheel II in a schematic view. The air flow blown out by the fan wheel II is separated into two separate air flows 24 and 25 by means of a separating web 23, which 10 surrounds the fan wheel II at an angular range of at least 450, for example. The air flows 24 and 25 can be supplied to the respective air outlet channels 13a and 13b. An early separation of the air flow, which is blown out by the fan wheel 11, in the area of the fan wheel 11, homogenizes the flow speed of the particles within the air flow, which is blown out by the fan wheel 11. Large difference in speeds, which could lead 15 to turbulences and thus to noise developments, for example, are prevented through this. In Fig. 8a, the separating web extends in a plane along the axis of rotation 21 of the fan wheel 11, for example substantially across a height of the fan wheel 11, which is measured along the axis of the rotation 21 of the fan wheel 11. 20 In Fig. 8b, the air flow, which is blown out by the fan wheel 11, is separated by a separating web perpendicular to the axis of rotation of the fan wheel 11 and is supplied to the air outlet channels 13a and 13b, which can be arranged axially along the axis of rotation 21 so as to be offset relative to one another. In Fig. 8c, the surrounding wall 18, which partially surrounds the fan wheel 11, 25 encompasses a distance from the radial outer edge of the fan wheel 11, which remains substantially the same. The lateral side view 8d of this arrangement shows that a height of the fan wheel 11, measured along the axis of rotation 21, of a clearance located between the surrounding wall 18 and the fan wheel, increases in the running direction of the fan wheel 11 and is separated in a plane perpendicular to the axis of -24 rotation 21 by means of the separating web 23. The air flow, which is blown out by the fan wheel 11, is thus divided to the ambient air outlet channels 13a and 13b, which are axially offset along the axis of rotation 21. By means of the arrangements of the fan wheel 11, the surrounding wall 18, the 5 separating web 13 and the air outlet channels 13a and 13b shown in Figs. 8a to 8d, alternatives can be chosen depending on the installation space requirements, which provide for a slow-down of the air flow, which has been blown out, and for a diversion in different directions, so that a reduced noise development outside of the air conditioning unit I can be obtained. 10 Figs. 9a and 9b show, schematically, alternatives of the air conditioning unit I in each case comprising differently designed air outlets for the ambient air. For instance, the air conditioning unit I shown in Fig. 9a encompasses ambient air outlets 26 laterally at two sides and upwards, which can be capable of being locked individually. Depending on the parking position and the surrounding area of the 15 vehicle, at least one of the ambient air outlets 26 can be locked, so as to reduce a noise emission towards this side. Fig. 9b shows a further alternative to this air conditioning unit 1, in which the ambient air outlets 26 can be rotated, for example downstream from a ventilation grille relative to an installation position of the air conditioning unit 1. A noise 20 emission can thus be oriented specifically, depending on the parking position and adjacency of the vehicle. Figs. 10a and 10b show, schematically, a further alternative of the air conditioning unit 1, which provides for an outlet of the air flows through the ambient air outlets 26 in different directions. The air conditioning unit I shown in Fig. 10a can be seen in 25 Fig. I Ob in a schematic lateral sectional view, in which the blow-out of the partial air flows in different directions is suggested schematically by means of arrows. Fig. 11, in turn, shows schematically a further alternative of the air conditioning unit 1. The air outlet channels 13 are thereby molded relative to the ambient air outlets -25 26 in a particular manner, here in a curved or angled manner, respectively. This is obtained in that the material of a housing area 27, which forms the air outlet channels 13, is a foam material (e.g. expanded polypropylene), e.g., by means of which virtually any shapes and contours can be created. The air outlet channels 13 can thus 5 be formed freely without particular production-orientated effort. In particular, it is thus possible that the material, which forms the air outlet channels 13, is formed such that there is no visual contact between the fan wheel 11 and the surrounding area of the air condition unit. The fan wheel 11 is then not visible from the outside to an observer. The noises, which are created by the fan wheel 11 10 during operation, can thus be shielded effectively from the surrounding area. To reach to the outside into the surrounding area, the sound waves must be deflected several times in the curved or angled air outlet channels 13, respectively, so that they are insulated heavily. This applies all the more when the material forming the air outlet channels 13 has a sound-insulating effect. 15 By means of the illustrated measures, which can be implemented individually as well as in combination at the ambient air flow guide on the one hand and at the interior air guide on the other hand, an improved noise emission can be obtained in the case of an air conditioning unit 1, depending on the demands, the design and the available installation space. Depending on whether a reduction of the noise emission 20 is to be obtained in the interior or in a surrounding area of the air conditioning unit 1, all of the measures, which have been shown herein in an exemplary manner for the ambient air guide, can be implemented in the ambient air guide as shown and/or in the interior air guide. The noise emission into the surrounding area as well as into the interior of the vehicle can be reduced considerably through this. 25 In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the 30 invention.

Claims

1. An air conditioning unit (1) comprising - an air inlet channel, which leads away from an air inlet (3, 3a, 3b), 5 - an air conveying device (11, 16), which is arranged downstream from the air inlet channel, - a branching area, which is arranged downstream from the air conveying device (11), to at least two air outlet channels (13a, 13b), which in each case lead to an air outlet (4a, 4b), and comprising 10 - a heat transmission device (1Oa, lOb), which is arranged in the air inlet channel and/or in the air outlet channels (13a, 13b), and through which the air, which is guided through the air inlet channel and/or through the air outlet channels, is guided; wherein - the directions of the air flows, which escape through the respective air outlets (4a, 4b), are oriented differently; and wherein 15 - the air inlet (3, 3a, 3b) and the air outlets (4a, 4b) are open into a surrounding area outside of a room, which is to be air-conditioned.

2. The air conditioning unit (1) according to claim 1, wherein at least one of the air outlet channels (13a, 13b) encompasses a cross sectional surface, which increases 20 downstream, perpendicular to a main flow direction of an air flow guided therein.

3. The air conditioning unit (1) according to any one of the preceding claims, wherein - an air flow separating device (17) is arranged in the branching area, and 25 wherein - wherein the air flow separating device (17) encompasses a first edge (17a), which defines a first (13a) one of the at least two air outlet channels (13a, 13b), and a second edge (17b), which defines a second one (13b) of the at least two air outlet channels (13a, 13b) and which adjoins the first edge (17a) in an apex (17c). 30

4. The air conditioning unit (1) according to any one of the preceding claims, wherein - the air conveying device encompasses a fan wheel (11), - the first edge (17a) is arranged in a running direction of the fan wheel (11) 35 downstream from the apex (17c) and faces the fan wheel (11) in a substantially -27 tangential manner or runs parallel to a virtual tangent, which is tangential to the fan wheel and - the second edge (17b) is arranged so as to lead away from the fan wheel (11) in a substantially tangential manner. 5

5. The air conditioning unit (1) according to any one of the preceding claims, wherein - the first edge (1 7a) defines the air flow separating device (17) convexly, - the second edge (1 7b) defines the air separating device (17) concavely and 10 - the apex (17c) is curved.

6. The air conditioning unit (1) according to any one of the preceding claims, wherein - provision is made for a surrounding wall (18), which partially surrounds the 15 fan wheel (11), and - a distance of the surrounding wall (18) from a radial outer edge of the fan wheel (11) increases in the running direction of the fan wheel (11).

7. The air conditioning unit (1) according to any one of the preceding claims, 20 wherein - provision is made for a surrounding wall (18), which partially surrounds the fan wheel (11), - a distance of the surrounding wall (18) from a radial outer edge of the fan wheel (11) is substantially constant in the running direction of the fan wheel and 25 - a height, which is measured lengthwise to the axis of rotation (21) of the fan wheel (11), of a clearance, which is located between the surrounding wall (18) and the fan wheel (11), increases in the running direction of the fan wheel (11).

8. The air conditioning unit (1) according to any one of the preceding claims, 30 wherein - provision is made in the clearance located between the surrounding wall (18) and the fan wheel (11) for a separating web (23), which surrounds the fan wheel (11) at an angular range around the axis of rotation (21) of the fan wheel (11), and - the separating web (23) separates the air flow, which is blown out by the fan 35 wheel (11), and proportionally feeds it in each case to one of the air outlet channels (13a, 13b). -28

9. The air conditioning unit (1) according to any one of the preceding claims, wherein the separating web (23) between the fan wheel (11) and the surrounding wall (18) extends in a direction along the axis of rotation (21) of the fan wheel (11) substantially across a height of the fan wheel (11), which is measured along the axis of 5 the rotation (21) of the fan wheel (11).

10. The air conditioning unit (1) according to any one of the preceding claims, wherein - the separating web (23) extends in a plane perpendicular to the axis of rotation 10 (21) of the fan wheel (11) and wherein - the at least two air outlet channels (13a, 13b) are arranged axially along the axis of rotation (21) of the fan wheel (11) so as to be offset relative to one another.

11. The air conditioning unit (1) according to any one of the preceding claims, 15 wherein the heat transmission device (1Oa, 1Ob) is arranged in the air inlet channel.

12. The air conditioning unit (1) according to any one of the preceding claims, wherein the air outlets (4a, 4b) are in each case arranged at different sides of the air conditioning unit (1). 20

13. The air conditioning unit (1) according to any one of the preceding claims, wherein at least one of the air outlets (4a, 4b) and/or of the air outlet channels (13a, 13b) can be locked and/or can be rotated and/or displaced relative to an installation position of the air conditioning unit (1) 25

14. The air conditioning unit (1) according to any one of the preceding claims, wherein the air inlet channel, the first one of the at least two air outlet channels (1 3a, 13b), the second one of the at least two air outlet channels (13a, 13b), the air flow separating device (17) and/or the surrounding wall (18) is formed completely or 30 partially of a sound-insulating material, is surrounded by a sound-insulating material and/or is coated with a sound-insulating material.

15. The air conditioning unit (1) according to any one of the preceding claims, wherein the sound-insulating material is expanded polypropylene or an open-pored 35 foam. -29

16. The air conditioning unit (1) according to any one of the preceding claims, wherein the air inlet channel and/or at least one of the at least two air outlet channels (13a, 13b) is longer than wide. 5

17. The air conditioning unit (1) according to any one of the preceding claims, wherein the material, which forms the air outlet channels (13), is formed such that there is no visual contact between the fan wheel (11) and the surrounding area of the air conditioning unit.